Snapshots

.gitmodules

@@ -5,3 +5,4 @@
 	path = modules/websocketpp
 	url = https://github.com/rerdavies/websocketpp.git
 	branch = develop
+	update = merge

PiPedalCommon/src/ConfigSerializer.cpp

@@ -23,6 +23,7 @@
  */
 
 #include "ConfigSerializer.hpp"
+#include "util.hpp"
 
 
 using namespace config_serializer;
@@ -38,29 +39,6 @@ std::string config_serializer::detail::trim(const std::string &v)
     return v.substr(start, end+1 - start);
 }
 
-std::vector<std::string> config_serializer::detail::split(const std::string &value, char delimiter)
-{
-    size_t start = 0;
-    std::vector<std::string> result;
-    while (start < value.length())
-    {
-        size_t pos = value.find_first_of(delimiter, start);
-        if (pos == std::string::npos)
-        {
-            result.push_back(value.substr(start));
-            break;
-        }
-        result.push_back(value.substr(start, pos - start));
-        start = pos + 1;
-        if (start == value.length())
-        {
-            // ends with delimieter? Then there's an empty-length value at the end.
-            result.push_back("");
-        }
-    }
-    return result;
-}
-
 
 
 std::string config_serializer::detail::EncodeString(const std::string &s)

PiPedalCommon/src/include/ConfigSerializer.hpp

@@ -31,6 +31,9 @@
 #include <unordered_map>
 #include <fstream>
 #include "ofstream_synced.hpp"
+#include "util.hpp"
+
+using namespace pipedal;
 
 namespace config_serializer
 {
@@ -38,8 +41,6 @@ namespace config_serializer
     {
         std::string trim(const std::string &v);
 
-        std::vector<std::string> split(const std::string &v, char seperator);
-
         /**
          * @brief Convert string to config file format.
          *

PiPedalCommon/src/include/json.hpp

@@ -586,8 +586,12 @@ namespace pipedal
         template <typename T>
         void write(const std::shared_ptr<T> &obj)
         {
+            if (!obj) {
+                write_raw("null");
+            } else {
                 write(obj.get());
             }
+        }
         template <typename T>
         void write(const std::weak_ptr<T> &obj)
         {
@@ -864,12 +868,20 @@ namespace pipedal
         }
         template <typename T>
         void read(std::shared_ptr<T> *pUniquePtr)
+        {
+            if (peek() == 'n')
+            {
+                consumeToken("null", "Expecting '{' or 'null'.");
+                *pUniquePtr = nullptr;
+
+            } else 
             {
                 std::shared_ptr<T> p = std::make_shared<T>();
 
                 read(p.get());
                 (*pUniquePtr) = std::move(p);
             }
+        }
         template <typename T>
         void read(std::weak_ptr<T> *pUniquePtr)
         {

PiPedalCommon/src/include/util.hpp

@@ -23,6 +23,9 @@
 #pragma once 
 #include <string>
 #include <filesystem>
+#include <vector>
+#include <barrier>
+#include <atomic>
 
 namespace pipedal {
 
@@ -38,4 +41,30 @@ namespace pipedal {
 
     std::string GetHostName();
 
+    std::vector<std::string> split(const std::string &value, char delimiter);
+
+    inline void ReadBarrier() {
+        std::atomic_thread_fence(std::memory_order::acquire);
+    }
+    inline void WriteBarrier() {
+        std::atomic_thread_fence(std::memory_order::release);
+
+    }
+
+    class NoCopy {
+    public:
+        NoCopy() { }
+        NoCopy(const NoCopy&) = delete;
+        NoCopy&operator=(const NoCopy&) = delete;
+        ~NoCopy() {}
+    };
+    class NoMove {
+    public:
+        NoMove() { }
+        NoMove(NoMove&&) = delete;
+        NoMove&operator=(NoMove&&) = delete;
+        ~NoMove() { }
+
+    };
+
 }

PiPedalCommon/src/util.cpp

@@ -112,3 +112,27 @@ std::string pipedal::GetHostName()
     buffer[1023] = '\0';
     return buffer;
 }
+
+
+std::vector<std::string> pipedal::split(const std::string &value, char delimiter)
+{
+    size_t start = 0;
+    std::vector<std::string> result;
+    while (start < value.length())
+    {
+        size_t pos = value.find_first_of(delimiter, start);
+        if (pos == std::string::npos)
+        {
+            result.push_back(value.substr(start));
+            break;
+        }
+        result.push_back(value.substr(start, pos - start));
+        start = pos + 1;
+        if (start == value.length())
+        {
+            // ends with delimieter? Then there's an empty-length value at the end.
+            result.push_back("");
+        }
+    }
+    return result;
+}

react/public/index.html

@@ -36,7 +36,7 @@
 
   <style id="bgStyle">
     BODY {
-      background: #333;
+      background: #333; overscroll-behavior: "none"
     }
   </style>
   <script>
@@ -97,9 +97,9 @@
   </script>
 </head>
 
-<body>
+<body style="overscroll-behavior: none; overflow: hidden">
   <noscript>You need to enable JavaScript to run this app.</noscript>
-  <div id="root"></div>
+  <div id="root" style="height: 100%;position: absolute;left: 0px;right: 0px;top:0px;bottom: 0px"></div>
   <!--
       This HTML file is a template.
       If you open it directly in the browser, you will see an empty page.

react/src/App.tsx

@@ -93,7 +93,7 @@ const theme = createTheme(
                 },
                 secondary: {
                     main: "#FF6060"
-                },
+                }
             },
             mainBackground: "#222",
             toolbarColor: '#222'

react/src/AppThemed.tsx

@@ -21,6 +21,7 @@ import { SyntheticEvent } from 'react';
 import { WithStyles } from '@mui/styles';
 
 import './AppThemed.css';
+
 import AppBar from '@mui/material/AppBar';
 import Toolbar from '@mui/material/Toolbar';
 import CssBaseline from '@mui/material/CssBaseline';
@@ -48,7 +49,7 @@ import SettingsDialog from './SettingsDialog';
 import AboutDialog from './AboutDialog';
 import BankDialog from './BankDialog';
 
-import { PiPedalModelFactory, PiPedalModel, State, ZoomedControlInfo, wantsLoadingScreen } from './PiPedalModel';
+import { PiPedalModelFactory, PiPedalModel, State, ZoomedControlInfo, wantsReloadingScreen } from './PiPedalModel';
 import ZoomedUiControl from './ZoomedUiControl'
 import MainPage from './MainPage';
 import DialogContent from '@mui/material/DialogContent';
@@ -67,6 +68,9 @@ import { ReactComponent as SaveBankAsIcon } from './svg/ic_save_bank_as.svg';
 import { ReactComponent as EditBanksIcon } from './svg/ic_edit_banks.svg';
 import { ReactComponent as SettingsIcon } from './svg/ic_settings.svg';
 import { ReactComponent as HelpOutlineIcon } from './svg/ic_help_outline.svg';
+import { ReactComponent as FxAmplifierIcon } from './svg/fx_amplifier.svg';
+import { PerformanceView } from './PerformanceView';
+
 import DialogEx, { DialogStackState } from './DialogEx';
 
 
@@ -264,6 +268,8 @@ type AppState = {
     errorMessage: string;
     displayState: State;
 
+    performanceView: boolean;
+
     canFullScreen: boolean;
     isFullScreen: boolean;
     tinyToolBar: boolean;
@@ -313,6 +319,7 @@ const AppThemed = withStyles(appStyles)(class extends ResizeResponsiveComponent<
         );
 
         this.state = {
+            performanceView: false,
             zoomedControlInfo: this.model_.zoomedUiControl.get(),
             isDrawerOpen: false,
             errorMessage: this.model_.errorMessage.get(),
@@ -729,8 +736,7 @@ const AppThemed = withStyles(appStyles)(class extends ResizeResponsiveComponent<
             <div style={{
                 colorScheme: isDarkMode() ? "dark" : "light", // affects scrollbar color
                 minHeight: 345, minWidth: 390,
-                position: "absolute", width: "100%", height: "100%", background: "#F88", userSelect: "none",
+                position: "absolute", left:0, top: 0, right:0,bottom:0,
-                display: "flex", flexDirection: "column", flexWrap: "nowrap",
                 overscrollBehavior: this.state.isDebug ? "auto" : "none"
             }}
                 onContextMenu={(e) => {
@@ -740,7 +746,19 @@ const AppThemed = withStyles(appStyles)(class extends ResizeResponsiveComponent<
                 }}
             >
                 <CssBaseline />
-                {(!this.state.tinyToolBar) ?
+                {this.state.performanceView ? (
+                    <PerformanceView
+                        onClose={() => { this.setState({ performanceView: false }); }}
+                    />
+                ) : (
+                    <div style={{
+                        position: "absolute", width: "100%", height: "100%", userSelect: "none",
+                        display: "flex", flexDirection: "column", flexWrap: "nowrap"
+                    }}
+                    >
+
+
+                        {(!this.state.tinyToolBar) && !this.state.performanceView ?
                             (
                                 <AppBar position="absolute"  >
                                     <Toolbar variant="dense" className={classes.toolBar}  >
@@ -803,8 +821,25 @@ const AppThemed = withStyles(appStyles)(class extends ResizeResponsiveComponent<
                             )}
                         <TemporaryDrawer position='left' title="PiPedal"
                             is_open={this.state.isDrawerOpen} onClose={() => { this.hideDrawer(); }} >
-                    <ListSubheader className="listSubheader" component="div" id="xnested-list-subheader" style={{ background: "rgba(12,12,12,0.0)" }}>
+
-                        <Typography variant="caption" style={{ position: "relative", top: 15 }}>Banks</Typography></ListSubheader>
+                            <List>
+                                <ListItem button key='PerformanceView'
+                                    onClick={(ev) => {
+                                        ev.stopPropagation();
+                                        this.hideDrawer(true);
+                                        this.setState({ performanceView: true });
+                                    }}>
+                                    <ListItemIcon >
+                                        <FxAmplifierIcon color='inherit' className={classes.menuIcon} style={{ width: 24, height: 24 }} />
+                                    </ListItemIcon>
+                                    <ListItemText primary='Performance View' />
+                                </ListItem>
+                            </List>
+                            <Divider />
+                            <ListSubheader className="listSubheader" component="div" id="xnested-list-subheader" style={{ lineHeight: "24px", height: 24, background: "rgba(12,12,12,0.0)" }}
+                                disableSticky={true}
+                            >
+                                <Typography variant="caption" style={{}}>Banks</Typography></ListSubheader>
 
                             <List >
                                 {
@@ -918,9 +953,11 @@ const AppThemed = withStyles(appStyles)(class extends ResizeResponsiveComponent<
                         <main className={classes.mainFrame} >
                             <div className={classes.mainSizingPosition}>
                                 <div className={classes.heroContent}>
-                            {(this.state.displayState !== State.Loading) && (
+                                    {(this.state.displayState !== State.Loading) &&
-                                <MainPage hasTinyToolBar={this.state.tinyToolBar} />
+                                        (
-                            )}
+                                            <MainPage hasTinyToolBar={this.state.tinyToolBar} enableStructureEditing={true} />
+                                        )
+                                    }
                                 </div>
 
                             </div>
@@ -963,11 +1000,13 @@ const AppThemed = withStyles(appStyles)(class extends ResizeResponsiveComponent<
                         />
                         <UpdateDialog open={this.state.updateDialogOpen} />
                         {this.state.showStatusMonitor && (<JackStatusView />)}
+                    </div>
+                )
+                }
 
 
 
-                <DialogEx
+                <DialogEx tag="Alert"
-                    tag="Alert"
                     open={this.state.alertDialogOpen}
                     onClose={this.handleCloseAlert}
                     aria-describedby="alert-dialog-description"
@@ -989,24 +1028,6 @@ const AppThemed = withStyles(appStyles)(class extends ResizeResponsiveComponent<
                 </DialogEx>
 
 
-                <div className={classes.errorContent} style={{
-                    display: (
-                        wantsLoadingScreen(this.state.displayState)
-                            ? "block" : "none"
-                    )
-                }}
-                >
-                    <div className={classes.errorContentMask} />
-
-                    <div className={classes.loadingBox}>
-                        <div className={classes.loadingBoxItem}>
-                            <CircularProgress color="inherit" className={classes.loadingBoxItem} />
-                        </div>
-                        <Typography display="block" noWrap variant="body2" className={classes.progressText}>
-                            {this.getReloadingMessage()}
-                        </Typography>
-                    </div>
-                </div>
                 <div className={classes.errorContent} style={{ display: this.state.displayState === State.Error ? "flex" : "none" }}
                     onMouseDown={preventDefault} onKeyDown={preventDefault}
                 >
@@ -1034,6 +1055,7 @@ const AppThemed = withStyles(appStyles)(class extends ResizeResponsiveComponent<
                     <div style={{ flex: "5 5 auto", height: 20 }} >&nbsp;</div>
 
                 </div>
+                {/* initial load mask*/}
                 <div className={classes.errorContent} style={{ display: this.state.displayState === State.Loading ? "block" : "none" }}>
                     <div className={classes.errorContentMask} />
                     <div className={classes.loadingBox}>
@@ -1045,11 +1067,30 @@ const AppThemed = withStyles(appStyles)(class extends ResizeResponsiveComponent<
                         </Typography>
                     </div>
                 </div>
+                {/* Reloading mask */}
+                <div className={classes.errorContent} style={{
+                    zIndex: 501,
+                    display: (
+                        wantsReloadingScreen(this.state.displayState)
+                            ? "block" : "none"
+                    )
+                }}
+                >
+                    <div className={classes.errorContentMask} />
+
+                    <div className={classes.loadingBox}>
+                        <div className={classes.loadingBoxItem}>
+                            <CircularProgress color="inherit" className={classes.loadingBoxItem} />
+                        </div>
+                        <Typography display="block" noWrap variant="body2" className={classes.progressText}>
+                            {this.getReloadingMessage()}
+                        </Typography>
+                    </div>
+                </div>
 
             </div >
         );
     }
-}
+});
-);
 
 export default AppThemed;

react/src/ColorDropdownButton.tsx

@@ -0,0 +1,97 @@
+import React, { useState, useEffect } from 'react';
+import ButtonBase from '@mui/material/ButtonBase';
+import Menu from '@mui/material/Menu';
+import MenuItem from '@mui/material/MenuItem';
+import { colorKeys, getBackgroundColor } from './MaterialColors';
+import { useTheme } from '@mui/styles';
+
+const colors: string[] = colorKeys;
+
+interface ColorDropdownButtonProps {
+    currentColor?: string;
+    onColorChange: (color: string) => void;
+}
+
+const ColorDropdownButton: React.FC<ColorDropdownButtonProps> = ({
+    currentColor = colors[0],
+    onColorChange,
+}) => {
+    const [anchorEl, setAnchorEl] = useState<null | HTMLElement>(null);
+    const [selectedColor, setSelectedColor] = useState<string>(currentColor);
+
+    const theme = useTheme();
+
+    useEffect(() => {
+        setSelectedColor(currentColor);
+    }, [currentColor]);
+
+    const handleClick = (event: React.MouseEvent<HTMLButtonElement>) => {
+        setAnchorEl(event.currentTarget);
+    };
+
+    const handleClose = () => {
+        setAnchorEl(null);
+    };
+
+    const handleColorSelect = (color: string) => {
+        handleClose();
+        setSelectedColor(color);
+        onColorChange(color);
+    };
+
+    return (
+        <div>
+            <ButtonBase
+                onClick={handleClick}
+                style={{
+                    width: 48, height: 48, padding: 12, borderRadius: 18
+                }}
+            >
+                <div style={{
+                    width: 24, height: 24,
+                    background: getBackgroundColor(selectedColor),
+                    borderRadius: 6,
+                    borderColor: theme.palette.text.secondary,
+                    borderWidth: 1,
+                    borderStyle: "solid"
+                }} />
+
+            </ButtonBase>
+            <Menu
+                anchorEl={anchorEl}
+                open={anchorEl !== null}
+                onClose={handleClose}
+                anchorOrigin={{
+                    vertical: 'bottom',
+                    horizontal: 'right',
+                }}
+                transformOrigin={{
+                    vertical: 'top',
+                    horizontal: 'right',
+                }}
+            >
+                <div style={{ display: "flex", flexFlow: "row wrap", width: 56 * 4 + 2 }}>
+                    {colors.map((color) => {
+                        let selected = color === selectedColor;
+                        return (
+                            <MenuItem key={color} onClick={() => handleColorSelect(color)}
+                                style={{
+                                    width: 48, height: 48, borderRadius: 6, margin: 4,
+                                    borderStyle: "solid",
+                                    borderWidth: selected ? 2 : 0.25,
+                                    borderColor: color === selectedColor ?
+                                        theme.palette.text.primary
+                                        : theme.palette.text.secondary,
+                                    backgroundColor: getBackgroundColor(color)
+                                }}
+                            ></MenuItem>
+                        )
+                    }
+                    )}
+                </div>
+            </Menu>
+        </div>
+    );
+};
+
+export default ColorDropdownButton;

react/src/DialogEx.tsx

@@ -24,6 +24,7 @@ import Dialog, {DialogProps} from '@mui/material/Dialog';
 
 interface DialogExProps extends DialogProps {
     tag: string;
+    fullwidth?: boolean;
 }
 
 interface DialogExState {
@@ -171,7 +172,7 @@ class DialogEx extends React.Component<DialogExProps,DialogExState>  {
     render() {
         let { tag,onClose, ...extra} = this.props;
         return (
-            <Dialog {...extra} onClose={(event,reason)=>{ this.myOnClose(event,reason);}}>
+            <Dialog fullWidth={this.props.fullWidth??false} maxWidth={this.props.fullWidth ? false: undefined} {...extra} onClose={(event,reason)=>{ this.myOnClose(event,reason);}}>
                 {this.props.children}
             </Dialog>
         );

react/src/GxTunerControl.tsx

@@ -319,6 +319,7 @@ const GxTunerControl =
                 return this.makeTick(pitchInfo,cents,r0,r1,"#666", width);
             }
 
+            nextKey() { return "key" + (this.keyCounter++)}
             makeTick(pitchInfo: PitchInfo, cents: number, r0: number, r1: number, stroke: string,width: number): React.ReactNode
             {
                 let range = pitchInfo.semitoneCents;
@@ -335,7 +336,7 @@ const GxTunerControl =
                 let cy = NEEDLE_CY;
                 let path = new SvgPathBuilder().moveTo(r0*sin_+cx,r0*cos_+cy).lineTo(r1*sin_+cx,r1*cos_+cy).toString();
 
-                return (<path d={path} stroke={stroke} strokeWidth={width+""} />);
+                return (<path key={this.nextKey()} d={path} stroke={stroke} strokeWidth={width+""} />);
             }
 
             lastValidTime: number =  0;
@@ -406,7 +407,10 @@ const GxTunerControl =
                 )
             }
 
+            keyCounter: number = 0;
+
             render() {
+                this.keyCounter = 0;
                 let textColor = isDarkMode() ? "#999": "#444";
                 return (<div ref={this.refRoot} style={{width: DIAL_WIDTH, height: DIAL_HEIGHT, fontSize: "2em", fontWeight: 700, position: "relative",
                     boxShadow: isDarkMode() ? 

react/src/LoadPluginDialog.tsx

@@ -292,8 +292,11 @@ export const LoadPluginDialog =
                     }
                 );
             }
+            mounted: boolean = false;
+
             componentDidMount() {
                 super.componentDidMount();
+                this.mounted = true;
                 this.updateWindowSize();
                 window.addEventListener('resize', this.updateWindowSize);
 
@@ -307,10 +310,12 @@ export const LoadPluginDialog =
                 });
             }
             componentWillUnmount() {
+                this.cancelSearchTimeout();
                 this.model.ui_plugins.removeOnChangedHandler(this.handlePluginsChanged);
                 this.model.favorites.removeOnChangedHandler(this.handleFavoritesChanged);
-                super.componentWillUnmount();
                 window.removeEventListener('resize', this.updateWindowSize);
+                this.mounted = false;
+                super.componentWillUnmount();
             }
 
             componentDidUpdate(oldProps: PluginGridProps) {
@@ -574,6 +579,10 @@ export const LoadPluginDialog =
 
 
             handleSearchStringReady() {
+                if (!this.mounted) 
+                {
+                    return;
+                }
                 if (this.changedSearchString !== undefined) {
                     this.requestScrollTo();
                     this.setState({
@@ -584,12 +593,17 @@ export const LoadPluginDialog =
                 this.hSearchTimeout = undefined;
             }
 
-
+            cancelSearchTimeout()
-            handleSearchStringChanged(text: string): void {
+            {
                 if (this.hSearchTimeout) {
                     clearTimeout(this.hSearchTimeout);
                     this.hSearchTimeout = undefined;
                 }
+
+            }
+
+            handleSearchStringChanged(text: string): void {
+                this.cancelSearchTimeout();
                 this.changedSearchString = text;
                 this.hSearchTimeout = setTimeout(
                     this.handleSearchStringReady,

react/src/MainPage.tsx

@@ -45,13 +45,25 @@ import PluginInfoDialog from './PluginInfoDialog';
 import { GetControlView } from './ControlViewFactory';
 import MidiBindingsDialog from './MidiBindingsDialog';
 import PluginPresetSelector from './PluginPresetSelector';
-import {ReactComponent as OldDeleteIcon} from "./svg/old_delete_outline_24dp.svg";
+import { ReactComponent as OldDeleteIcon } from "./svg/old_delete_outline_24dp.svg";
-import {ReactComponent as MidiIcon} from "./svg/ic_midi.svg";
+import { ReactComponent as MidiIcon } from "./svg/ic_midi.svg";
-import {isDarkMode} from './DarkMode';
+import { isDarkMode } from './DarkMode';
+import { ReactComponent as Snapshot0Icon } from "./svg/snapshot_0.svg";
+import { ReactComponent as Snapshot1Icon } from "./svg/snapshot_1.svg";
+import { ReactComponent as Snapshot2Icon } from "./svg/snapshot_2.svg";
+import { ReactComponent as Snapshot3Icon } from "./svg/snapshot_3.svg";
+import { ReactComponent as Snapshot4Icon } from "./svg/snapshot_4.svg";
+import { ReactComponent as Snapshot5Icon } from "./svg/snapshot_5.svg";
+import { ReactComponent as Snapshot6Icon } from "./svg/snapshot_6.svg";
 
-const SPLIT_CONTROLBAR_THRESHHOLD = 650;
+import SnapshotDialog from './SnapshotDialog';
 
+
+const SPLIT_CONTROLBAR_THRESHHOLD = 750;
+const DISPLAY_AUTHOR_THRESHHOLD = 750;
+const DISPLAY_AUTHOR_SPLIT_THRESHOLD = 500;
 const HORIZONTAL_CONTROL_SCROLL_HEIGHT_BREAK = 500;
+
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
 const HORIZONTAL_LAYOUT_MQ = "@media (max-height: " + HORIZONTAL_CONTROL_SCROLL_HEIGHT_BREAK + "px)";
 
@@ -86,7 +98,7 @@ const styles = ({ palette }: Theme) => createStyles({
         flex: "0 0 162px", width: "100%", height: 162, overflowY: "hidden",
     },
     title: { fontSize: "1.1em", fontWeight: 700, marginRight: 8, textOverflow: "ellipsis", whiteSpace: "nowrap", opacity: 0.75 },
-    author: { fontWeight: 500, marginRight: 8, textOverflow: "ellipsis", whiteSpace: "nowrap",opacity: 0.75 }
+    author: { fontWeight: 500, marginRight: 8, textOverflow: "ellipsis", whiteSpace: "nowrap", opacity: 0.75 }
 });
 
 
@@ -94,14 +106,18 @@ const styles = ({ palette }: Theme) => createStyles({
 interface MainProps extends WithStyles<typeof styles> {
     hasTinyToolBar: boolean;
     theme: Theme;
+    enableStructureEditing: boolean;
 }
 
 interface MainState {
     selectedPedal: number;
+    selectedSnapshot: number;
     loadDialogOpen: boolean;
+    snapshotDialogOpen: boolean;
     pedalboard: Pedalboard;
     addMenuAnchorEl: HTMLElement | null;
     splitControlBar: boolean;
+    displayAuthor: boolean;
     horizontalScrollLayout: boolean;
     showMidiBindingsDialog: boolean;
     screenHeight: number;
@@ -111,10 +127,21 @@ interface MainState {
 
 export const MainPage =
     withStyles(styles, { withTheme: true })(
-        class extends ResizeResponsiveComponent<MainProps, MainState>
+        class extends ResizeResponsiveComponent<MainProps, MainState> {
-        {
             model: PiPedalModel;
 
+            getSplitToolbar() {
+                return this.windowSize.width < SPLIT_CONTROLBAR_THRESHHOLD;
+            }
+            getDisplayAuthor()
+            {
+                if (this.getSplitToolbar())
+                {
+                    return this.windowSize.width >= DISPLAY_AUTHOR_SPLIT_THRESHOLD;
+                } else {
+                    return this.windowSize.width >=  DISPLAY_AUTHOR_THRESHHOLD;
+                }
+            }
             constructor(props: MainProps) {
                 super(props);
                 this.model = PiPedalModelFactory.getInstance();
@@ -123,14 +150,18 @@ export const MainPage =
 
                 this.state = {
                     selectedPedal: selectedPedal,
+                    selectedSnapshot: -1,
                     loadDialogOpen: false,
+                    snapshotDialogOpen: false,
                     pedalboard: pedalboard,
                     addMenuAnchorEl: null,
-                    splitControlBar: this.windowSize.width < SPLIT_CONTROLBAR_THRESHHOLD,
+                    splitControlBar: this.getSplitToolbar(),
+                    displayAuthor: this.getDisplayAuthor(),
                     horizontalScrollLayout: this.windowSize.height < HORIZONTAL_CONTROL_SCROLL_HEIGHT_BREAK,
                     showMidiBindingsDialog: false,
                     screenHeight: this.windowSize.height
 
+
                 };
                 this.onSelectionChanged = this.onSelectionChanged.bind(this);
                 this.onPedalDoubleClick = this.onPedalDoubleClick.bind(this);
@@ -138,6 +169,7 @@ export const MainPage =
                 this.onLoadOk = this.onLoadOk.bind(this);
                 this.onLoadCancel = this.onLoadCancel.bind(this);
                 this.onPedalboardChanged = this.onPedalboardChanged.bind(this);
+                this.onSelectedSnapshotChanged = this.onSelectedSnapshotChanged.bind(this);
                 this.handleEnableCurrentItemChanged = this.handleEnableCurrentItemChanged.bind(this);
             }
 
@@ -204,9 +236,16 @@ export const MainPage =
                 }
                 this.setState({
                     pedalboard: value,
-                    selectedPedal: selectedItem
+                    selectedPedal: selectedItem,
+                    selectedSnapshot: value.selectedSnapshot
                 });
             }
+            onSelectedSnapshotChanged(selectedSnapshot: number) {
+                this.setState({
+                    selectedSnapshot: selectedSnapshot
+                });
+
+            }
             onDeletePedal(instanceId: number): void {
                 let result = this.model.deletePedalboardPedal(instanceId);
                 if (result != null) {
@@ -217,14 +256,17 @@ export const MainPage =
             componentDidMount() {
                 super.componentDidMount();
                 this.model.pedalboard.addOnChangedHandler(this.onPedalboardChanged);
+                this.model.selectedSnapshot.addOnChangedHandler(this.onSelectedSnapshotChanged);
             }
             componentWillUnmount() {
+                this.model.selectedSnapshot.removeOnChangedHandler(this.onSelectedSnapshotChanged);
                 this.model.pedalboard.removeOnChangedHandler(this.onPedalboardChanged);
                 super.componentWillUnmount();
             }
             updateResponsive() {
                 this.setState({
-                    splitControlBar: this.windowSize.width < SPLIT_CONTROLBAR_THRESHHOLD,
+                    splitControlBar: this.getSplitToolbar(),
+                    displayAuthor: this.getDisplayAuthor(),
                     horizontalScrollLayout: this.windowSize.height < HORIZONTAL_CONTROL_SCROLL_HEIGHT_BREAK,
                     screenHeight: this.windowSize.height
                 });
@@ -267,10 +309,16 @@ export const MainPage =
                 let newSelectedItem = this.model.loadPedalboardPlugin(itemId, selectedUri);
                 this.setState({ selectedPedal: newSelectedItem });
             }
+            onSnapshotDialogOk(): void {
+                this.setState({ snapshotDialogOpen: false });
+            }
 
             onLoadClick(e: SyntheticEvent) {
                 this.setState({ loadDialogOpen: true });
             }
+            onSnapshotClick() {
+                this.setState({ snapshotDialogOpen: true });
+            }
 
             getPedalboardItem(selectedId?: number): PedalboardItem | null {
                 if (selectedId === undefined) return null;
@@ -352,8 +400,8 @@ export const MainPage =
                             display: "flex", flexDirection: "row", height: 48, flexWrap: "nowrap",
                             alignItems: "center"
                         }}>
-                            <div style={{ flex: "0 1 auto",minWidth: 0 }}>
+                            <div style={{ flex: "0 1 auto", minWidth: 0 }}>
-                                <span style={{ color: isDarkMode()? "#F02020": "#800000" }}>
+                                <span style={{ color: isDarkMode() ? "#F02020" : "#800000" }}>
                                     <span className={classes.title}>{title}</span>
                                 </span>
                             </div>
@@ -363,13 +411,15 @@ export const MainPage =
                 } else {
                     return (
                         <div style={{
-                            flex: "1 1 auto", minWidth: 0,overflow: "hidden", marginRight: 8,
+                            flex: "1 1 auto", minWidth: 0, overflow: "hidden", marginRight: 8,
                             display: "flex", flexDirection: "row", height: 48, flexWrap: "nowrap",
                             alignItems: "center"
                         }}>
-                            <div style={{ flex: "0 1 auto", minWidth: 0,overflow: "hidden",textOverflow: "ellipsis" }}>
+                            <div style={{ flex: "0 1 auto", minWidth: 0, overflow: "hidden", textOverflow: "ellipsis" }}>
                                 <span className={classes.title}>{title}</span>
+                                {this.state.displayAuthor&&(
                                     <span className={classes.author}>{author}</span>
+                                )}
                             </div>
                             <div style={{ flex: "0 0 auto", verticalAlign: "center" }}>
                                 <PluginInfoDialog plugin_uri={pluginUri} />
@@ -383,6 +433,25 @@ export const MainPage =
                 }
             }
 
+            snapshotIcon(theme: Theme, snapshotNumber: number) {
+                switch (snapshotNumber + 1) {
+                    case 0:
+                    default:
+                        return (<Snapshot0Icon style={{ height: 24, width: 24, fill: theme.palette.text.primary, opacity: 0.6 }} />);
+                    case 1:
+                        return (<Snapshot1Icon style={{ height: 24, width: 24, fill: theme.palette.text.primary, opacity: 0.6 }} />);
+                    case 2:
+                        return (<Snapshot2Icon style={{ height: 24, width: 24, fill: theme.palette.text.primary, opacity: 0.6 }} />);
+                    case 3:
+                        return (<Snapshot3Icon style={{ height: 24, width: 24, fill: theme.palette.text.primary, opacity: 0.6 }} />);
+                    case 4:
+                        return (<Snapshot4Icon style={{ height: 24, width: 24, fill: theme.palette.text.primary, opacity: 0.6 }} />);
+                    case 5:
+                        return (<Snapshot5Icon style={{ height: 24, width: 24, fill: theme.palette.text.primary, opacity: 0.6 }} />);
+                    case 6:
+                        return (<Snapshot6Icon style={{ height: 24, width: 24, fill: theme.palette.text.primary, opacity: 0.6 }} />);
+                }
+            }
 
             render() {
                 let classes = this.props.classes;
@@ -438,6 +507,7 @@ export const MainPage =
                         <div id="pedalboardScroll" className={horizontalScrollLayout ? classes.pedalboardScrollSmall : classes.pedalboardScroll}
                             style={{ maxHeight: horizontalScrollLayout ? undefined : this.state.screenHeight / 2 }}>
                             <PedalboardView key={pluginUri} selectedId={this.state.selectedPedal}
+                                enableStructureEditing={this.props.enableStructureEditing}
                                 onSelectionChanged={this.onSelectionChanged}
                                 onDoubleClick={this.onPedalDoubleClick}
                                 hasTinyToolBar={this.props.hasTinyToolBar}
@@ -455,14 +525,16 @@ export const MainPage =
                                     </div>
                                 </div>
                                 {
-                                    (!this.state.splitControlBar) && this.titleBar(pedalboardItem)
+                                    (!this.state.splitControlBar || !this.props.enableStructureEditing) && this.titleBar(pedalboardItem)
                                 }
                                 <div style={{ flex: "1 1 1px" }}>
 
                                 </div>
+                                {this.props.enableStructureEditing && (
+                                    <div style={{ flex: "0 0 auto", display: "flex", flexFlow: "row nowrap",alignItems: "center" }}>
                                         <div style={{ flex: "0 0 auto", display: (canInsert || canAppend) ? "block" : "none", paddingRight: 8 }}>
                                             <IconButton onClick={(e) => { this.onAddClick(e) }} size="large">
-                                        <AddIcon style={{height: 24, width: 24,fill: this.props.theme.palette.text.primary, opacity: 0.6}} />
+                                                <AddIcon style={{ height: 24, width: 24, fill: this.props.theme.palette.text.primary, opacity: 0.6 }} />
                                             </IconButton>
                                             <Menu
                                                 id="add-menu"
@@ -483,7 +555,7 @@ export const MainPage =
                                             <IconButton
                                                 onClick={() => { this.onDeletePedal(pedalboardItem?.instanceId ?? -1) }}
                                                 size="large">
-                                        <OldDeleteIcon style={{height: 24, width: 24,fill: this.props.theme.palette.text.primary, opacity: 0.6}} />
+                                                <OldDeleteIcon style={{ height: 24, width: 24, fill: this.props.theme.palette.text.primary, opacity: 0.6 }} />
                                             </IconButton>
                                         </div>
                                         <div style={{ flex: "0 0 auto" }}>
@@ -494,8 +566,10 @@ export const MainPage =
                                                 onClick={this.onLoadClick}
                                                 disabled={this.state.selectedPedal === -1 || (!canLoad) || (this.getSelectedPedalboardItem()?.isSplit() ?? true)}
                                                 startIcon={<InputIcon />}
-                                        style={{ textTransform: "none", 
+                                                style={{
-                                            background: (isDarkMode() ? "#6750A4": undefined) }}
+                                                    textTransform: "none",
+                                                    background: (isDarkMode() ? "#6750A4" : undefined)
+                                                }}
                                             >
                                                 Load
                                             </Button>
@@ -504,14 +578,22 @@ export const MainPage =
                                             <IconButton
                                                 onClick={(e) => { this.handleMidiConfiguration(instanceId); }}
                                                 size="large">
-                                        <MidiIcon style={{height: 24, width: 24,fill: this.props.theme.palette.text.primary, opacity: 0.6}} />
+                                                <MidiIcon style={{ height: 24, width: 24, fill: this.props.theme.palette.text.primary, opacity: 0.6 }} />
                                             </IconButton>
-
                                         </div>
+                                        <div style={{ flex: "0 0 auto" }}>
+                                            <IconButton
+                                                onClick={(e) => { this.setState({ snapshotDialogOpen: true }); }}
+                                                size="large">
+                                                {this.snapshotIcon(this.props.theme, this.state.selectedSnapshot)}
+                                            </IconButton>
+                                        </div>
+                                    </div>
+                                )}
                             </div>
                         </div>
                         {
-                            this.state.splitControlBar && (
+                            this.state.splitControlBar && this.props.enableStructureEditing && (
                                 <div className={classes.splitControlBar}>
                                     {
                                         this.titleBar(pedalboardItem)
@@ -544,6 +626,9 @@ export const MainPage =
 
                             )
                         }
+                        {(this.state.snapshotDialogOpen) && (
+                            <SnapshotDialog open={this.state.snapshotDialogOpen} onOk={() => this.onSnapshotDialogOk()} />
+                        )}
                     </div>
                 );
             }

react/src/MaterialColors.tsx

@@ -0,0 +1,356 @@
+import { isDarkMode } from "./DarkMode";
+
+export const materialColors: { [Name: string]: { [Name: number]: string } } = {
+    "grey": {
+        50: '#FAFAFA',
+        100: '#F5F5F5',
+        200: '#EEEEEE',
+        300: '#E0E0E0',
+        400: '#BDBDBD',
+        500: '#9E9E9E',
+        600: '#757575',
+        700: '#616161',
+        800: '#424242',
+        900: '#212121'
+    },
+    "blueGrey": {
+        50: '#ECEFF1',
+        100: '#CFD8DC',
+        200: '#B0BEC5',
+        300: '#90A4AE',
+        400: '#78909C',
+        500: '#607D8B',
+        600: '#546E7A',
+        700: '#455A64',
+        800: '#37474F',
+        900: '#263238'
+    },
+
+    "red": {
+        50: '#FFEBEE',
+        100: '#FFCDD2',
+        200: '#EF9A9A',
+        300: '#E57373',
+        400: '#EF5350',
+        500: '#F44336',
+        600: '#E53935',
+        700: '#D32F2F',
+        800: '#C62828',
+        900: '#B71C1C',
+        //   A100: '#FF8A80',
+        //   A200: '#FF5252',
+        //   A400: '#FF1744',
+        //   A700: '#D50000'
+    },
+    "pink": {
+        50: '#FCE4EC',
+        100: '#F8BBD0',
+        200: '#F48FB1',
+        300: '#F06292',
+        400: '#EC407A',
+        500: '#E91E63',
+        600: '#D81B60',
+        700: '#C2185B',
+        800: '#AD1457',
+        900: '#880E4F',
+        //   A100: '#FF80AB',
+        //   A200: '#FF4081',
+        //   A400: '#F50057',
+        //   A700: '#C51162'
+    },
+    "purple": {
+        50: '#F3E5F5',
+        100: '#E1BEE7',
+        200: '#CE93D8',
+        300: '#BA68C8',
+        400: '#AB47BC',
+        500: '#9C27B0',
+        600: '#8E24AA',
+        700: '#7B1FA2',
+        800: '#6A1B9A',
+        900: '#4A148C',
+        //   A100: '#EA80FC',
+        //   A200: '#E040FB',
+        //   A400: '#D500F9',
+        //   A700: '#AA00FF'
+    },
+    "deepPurple": {
+        50: '#EDE7F6',
+        100: '#D1C4E9',
+        200: '#B39DDB',
+        300: '#9575CD',
+        400: '#7E57C2',
+        500: '#673AB7',
+        600: '#5E35B1',
+        700: '#512DA8',
+        800: '#4527A0',
+        900: '#311B92',
+        //   A100: '#B388FF',
+        //   A200: '#7C4DFF',
+        //   A400: '#651FFF',
+        //   A700: '#6200EA'
+    },
+    "indigo": {
+        50: '#E8EAF6',
+        100: '#C5CAE9',
+        200: '#9FA8DA',
+        300: '#7986CB',
+        400: '#5C6BC0',
+        500: '#3F51B5',
+        600: '#3949AB',
+        700: '#303F9F',
+        800: '#283593',
+        900: '#1A237E',
+        //   A100: '#8C9EFF',
+        //   A200: '#536DFE',
+        //   A400: '#3D5AFE',
+        //   A700: '#304FFE'
+    },
+    "blue": {
+        50: '#E3F2FD',
+        100: '#BBDEFB',
+        200: '#90CAF9',
+        300: '#64B5F6',
+        400: '#42A5F5',
+        500: '#2196F3',
+        600: '#1E88E5',
+        700: '#1976D2',
+        800: '#1565C0',
+        900: '#0D47A1',
+        //   A100: '#82B1FF',
+        //   A200: '#448AFF',
+        //   A400: '#2979FF',
+        //   A700: '#2962FF'
+    },
+    "lightBlue": {
+        50: '#E1F5FE',
+        100: '#B3E5FC',
+        200: '#81D4FA',
+        300: '#4FC3F7',
+        400: '#29B6F6',
+        500: '#03A9F4',
+        600: '#039BE5',
+        700: '#0288D1',
+        800: '#0277BD',
+        900: '#01579B',
+        // A100: '#80D8FF',
+        // A200: '#40C4FF',
+        // A400: '#00B0FF',
+        // A700: '#0091EA'
+    },
+    "cyan": {
+        50: '#E0F7FA',
+        100: '#B2EBF2',
+        200: '#80DEEA',
+        300: '#4DD0E1',
+        400: '#26C6DA',
+        500: '#00BCD4',
+        600: '#00ACC1',
+        700: '#0097A7',
+        800: '#00838F',
+        900: '#006064',
+        // A100: '#84FFFF',
+        // A200: '#18FFFF',
+        // A400: '#00E5FF',
+        // A700: '#00B8D4'
+    },
+    "teal": {
+        50: '#E0F2F1',
+        100: '#B2DFDB',
+        200: '#80CBC4',
+        300: '#4DB6AC',
+        400: '#26A69A',
+        500: '#009688',
+        600: '#00897B',
+        700: '#00796B',
+        800: '#00695C',
+        900: '#004D40',
+        // A100: '#A7FFEB',
+        // A200: '#64FFDA',
+        // A400: '#1DE9B6',
+        // A700: '#00BFA5'
+    },
+    "green": {
+        50: '#E8F5E9',
+        100: '#C8E6C9',
+        200: '#A5D6A7',
+        300: '#81C784',
+        400: '#66BB6A',
+        500: '#4CAF50',
+        600: '#43A047',
+        700: '#388E3C',
+        800: '#2E7D32',
+        900: '#1B5E20',
+        // A100: '#B9F6CA',
+        // A200: '#69F0AE',
+        // A400: '#00E676',
+        // A700: '#00C853'
+    },
+    "lightGreen": {
+        50: '#F1F8E9',
+        100: '#DCEDC8',
+        200: '#C5E1A5',
+        300: '#AED581',
+        400: '#9CCC65',
+        500: '#8BC34A',
+        600: '#7CB342',
+        700: '#689F38',
+        800: '#558B2F',
+        900: '#33691E',
+        // A100: '#CCFF90',
+        // A200: '#B2FF59',
+        // A400: '#76FF03',
+        // A700: '#64DD17'
+    },
+    "lime": {
+        50: '#F9FBE7',
+        100: '#F0F4C3',
+        200: '#E6EE9C',
+        300: '#DCE775',
+        400: '#D4E157',
+        500: '#CDDC39',
+        600: '#C0CA33',
+        700: '#AFB42B',
+        800: '#9E9D24',
+        900: '#827717',
+        // A100: '#F4FF81',
+        // A200: '#EEFF41',
+        // A400: '#C6FF00',
+        // A700: '#AEEA00'
+    },
+    "yellow": {
+        50: '#FFFDE7',
+        100: '#FFF9C4',
+        200: '#FFF59D',
+        300: '#FFF176',
+        400: '#FFEE58',
+        500: '#FFEB3B',
+        600: '#FDD835',
+        700: '#FBC02D',
+        800: '#F9A825',
+        900: '#F57F17',
+        // A100: '#FFFF8D',
+        // A200: '#FFFF00',
+        // A400: '#FFEA00',
+        // A700: '#FFD600'
+    },
+    "amber": {
+        50: '#FFF8E1',
+        100: '#FFECB3',
+        200: '#FFE082',
+        300: '#FFD54F',
+        400: '#FFCA28',
+        500: '#FFC107',
+        600: '#FFB300',
+        700: '#FFA000',
+        800: '#FF8F00',
+        900: '#FF6F00',
+        // A100: '#FFE57F',
+        // A200: '#FFD740',
+        // A400: '#FFC400',
+        // A700: '#FFAB00'
+    },
+    "orange": {
+        50: '#FFF3E0',
+        100: '#FFE0B2',
+        200: '#FFCC80',
+        300: '#FFB74D',
+        400: '#FFA726',
+        500: '#FF9800',
+        600: '#FB8C00',
+        700: '#F57C00',
+        800: '#EF6C00',
+        900: '#E65100',
+        // A100: '#FFD180',
+        // A200: '#FFAB40',
+        // A400: '#FF9100',
+        // A700: '#FF6D00'
+    },
+    "deepOrange": {
+        50: '#FBE9E7',
+        100: '#FFCCBC',
+        200: '#FFAB91',
+        300: '#FF8A65',
+        400: '#FF7043',
+        500: '#FF5722',
+        600: '#F4511E',
+        700: '#E64A19',
+        800: '#D84315',
+        900: '#BF360C',
+        // A100: '#FF9E80',
+        // A200: '#FF6E40',
+        // A400: '#FF3D00',
+        // A700: '#DD2C00'
+    },
+    "brown": {
+        50: '#EFEBE9',
+        100: '#D7CCC8',
+        200: '#BCAAA4',
+        300: '#A1887F',
+        400: '#8D6E63',
+        500: '#795548',
+        600: '#6D4C41',
+        700: '#5D4037',
+        800: '#4E342E',
+        900: '#3E2723'
+    }
+};
+
+
+function makeLabels() {
+    let result: string[] = [];
+    for (let [key] of Object.entries(materialColors)) {
+        result.push(key.toString());
+    }
+    return result;
+}
+
+export const colorKeys: string[] = makeLabels();
+
+const darkMode: boolean = isDarkMode();
+
+export function getBackgroundColor(colorKey: string): string {
+    let list = materialColors[colorKey];
+    if (!list) {
+        list = materialColors["grey"];
+    }
+    if (darkMode) {
+        if (colorKey === "grey" || colorKey === "yellow") 
+            {
+                return list[900];
+            }
+            else {
+                return list[800];
+            }
+    } else {
+        if (colorKey === "grey")
+        {
+            return list[200];
+        }
+        else {
+            return list[100];
+        }
+    }
+}
+
+export function getBorderColor(colorKey: string): string {
+    let list = materialColors[colorKey];
+    if (!list)
+    {
+        list = materialColors["grey"];
+    }
+    if (darkMode) {
+        if (colorKey === "grey" || colorKey === "yellow") 
+        {
+            return list[700];
+        }
+        return list[500];
+    } else {
+        if (colorKey === "grey")
+        {
+            return list[300];
+        }
+        return list[200];
+    }
+
+}

react/src/Pedalboard.tsx

@@ -70,6 +70,7 @@ export class PedalboardItem implements Deserializable<PedalboardItem> {
         this.stateUpdateCount = input.stateUpdateCount;
         this.lv2State = input.lv2State;
         this.lilvPresetUri = input.lilvPresetUri;
+        this.pathProperties = input.pathProperties;
         return this;
     }
     deserialize(input: any): PedalboardItem {
@@ -200,8 +201,81 @@ export class PedalboardItem implements Deserializable<PedalboardItem> {
     stateUpdateCount: number = 0;
     lv2State: [boolean,any] = [false,{}];
     lilvPresetUri: string = "";
+    pathProperties: {[Name: string]: string} = {};
 };
 
+export class SnapshotValue {
+    deserialize(input: any): SnapshotValue {
+        this.instanceId = input.instanceId;
+        this.controlValues = ControlValue.deserializeArray(input.controlValues);
+        this.lv2State = input.lv2state;
+        this.pathProperties = input.pathProperties;
+        return this;
+    }
+    static deserializeArray(input: any): SnapshotValue[] {
+        let result: SnapshotValue[] = [];
+        for (let i = 0; i < input.length; ++i) {
+            let inputItem: any = input[i];
+            let outputItem = new SnapshotValue().deserialize(inputItem);
+            result[i] = outputItem;
+
+        }
+        return result;
+    }
+    static createFromPedalboardItem(item: PedalboardItem)
+    {
+        let result = new SnapshotValue();
+        result.instanceId = item.instanceId;
+        result.controlValues = ControlValue.deserializeArray(item.controlValues); 
+        result.lv2State = item.lv2State; // we can do this, because lv2State is immutable.
+        result.pathProperties = {... item.pathProperties}; // clone the dictionary.
+        return result;
+    }
+    instanceId: number = -1;
+    controlValues: ControlValue[] = ControlValue.EmptyArray;
+    lv2State: [boolean,any] = [false,{}];
+    pathProperties: {[Name: string]: string} = {};
+}
+export class Snapshot {
+    deserialize(input: any): Snapshot {
+        this.values = SnapshotValue.deserializeArray(input.values);
+        this.name = input.name;
+        this.color = input.color;
+        return this;
+    }
+    static deserializeArray(input: any): (Snapshot| null)[] {
+        let result: (Snapshot|null)[] = [];
+        for (let i = 0; i < input.length; ++i) {
+            let inputItem: any = input[i];
+            let outputItem: (Snapshot|null) = null;
+            if (inputItem !== null)
+            {
+                outputItem = new Snapshot().deserialize(inputItem);
+            }
+            result[i] = outputItem;
+        }
+        return result;
+    }
+    static readonly  MAX_SNAPSHOTS: number = 6;
+
+    static cloneSnapshots(snapshots: (Snapshot|null)[]): (Snapshot|null)[]
+    {
+        let result: (Snapshot|null)[] = [];
+        for (let i = 0; i < Snapshot.MAX_SNAPSHOTS; ++i)
+        {
+            if (i >= snapshots.length) 
+            {
+                result.push(null);
+            } else {
+                result.push(snapshots[i]);
+            }
+        }
+        return result;
+    }
+    name: string = "";
+    color: string = "";
+    values: SnapshotValue[] = [];
+};
 
 export enum SplitType {
     Ab = 0,
@@ -277,6 +351,9 @@ export class Pedalboard implements Deserializable<Pedalboard> {
         this.output_volume_db = input.output_volume_db;
         this.items = PedalboardItem.deserializeArray(input.items);
         this.nextInstanceId = input.nextInstanceId ?? -1;
+        this.snapshots = input.snapshots ? Snapshot.deserializeArray(input.snapshots): [];
+        this.selectedSnapshot = input.selectedSnapshot;
+        this.pathProperties = input.pathProperties;
         return this;
     }
 
@@ -289,6 +366,10 @@ export class Pedalboard implements Deserializable<Pedalboard> {
     items: PedalboardItem[] = [];
     nextInstanceId: number = -1;
 
+    snapshots: (Snapshot | null)[] = [];
+    selectedSnapshot: number = -1;
+    pathProperties: {[Name: string]: string} = {};
+
     *itemsGenerator(): Generator<PedalboardItem, void, undefined> {
         let it = itemGenerator_(this.items);
         while (true)
@@ -299,6 +380,19 @@ export class Pedalboard implements Deserializable<Pedalboard> {
         }
     }
 
+    makeSnapshot(): Snapshot {
+        let result = new Snapshot();
+        let it = this.itemsGenerator();
+        while (true)
+        {
+            let v = it.next();
+            if (v.done) break;
+            let pedalboardItem = v.value;
+            let snapshotValue =  SnapshotValue.createFromPedalboardItem(pedalboardItem);
+            result.values.push(snapshotValue);
+        }
+        return result;
+    }
     hasItem(instanceId: number): boolean
     {
         let it = this.itemsGenerator();
@@ -570,6 +664,8 @@ export class Pedalboard implements Deserializable<Pedalboard> {
         item.pluginName = "";
         item.isEnabled = true;
         item.controlValues = [];
+        item.vstState = "";
+        item.lv2State = [false,{}];
 
     }
 

react/src/PedalboardView.tsx

@@ -191,6 +191,7 @@ interface PedalboardProps extends WithStyles<typeof pedalboardStyles> {
     onSelectionChanged?: OnSelectHandler;
     onDoubleClick?: OnSelectHandler;
     hasTinyToolBar: boolean;
+    enableStructureEditing: boolean;
 
 }
 interface LayoutSize {
@@ -392,6 +393,10 @@ const PedalboardView =
             }
 
             onDragEnd(instanceId: number, clientX: number, clientY: number) {
+                if (!this.props.enableStructureEditing)
+                {
+                    return;
+                }
                 if (!this.currentLayout) return;
 
                 if (!this.frameRef.current) return;
@@ -670,18 +675,27 @@ const PedalboardView =
                 event.preventDefault();
                 event.stopPropagation();
 
-                if (this.props.onDoubleClick && instanceId) {
+                if (this.props.onDoubleClick && instanceId && this.props.enableStructureEditing) {
                     this.props.onDoubleClick(instanceId);
                 }
 
             }
 
             onItemLongClick(event: SyntheticEvent, instanceId?: number): void {
+                if (!instanceId)
+                {
+                    return;
+                }
                 event.preventDefault();
                 event.stopPropagation();
 
+                if (!this.props.enableStructureEditing)
+                {
+                    this.setSelection(instanceId);
+                    return;
+                }
                 if (!Utility.needsZoomedControls()) {
-                    if (this.props.onDoubleClick && instanceId) {
+                    if (this.props.onDoubleClick && this.props.enableStructureEditing && instanceId) {
                         this.props.onDoubleClick(instanceId);
                     }
                 }
@@ -927,7 +941,7 @@ const PedalboardView =
                             onContextMenu={(e: SyntheticEvent) => { this.onItemLongClick(e, instanceId); }}
                         >
                             <SelectHoverBackground selected={instanceId === this.props.selectedId} showHover={true} borderRadius={6} >
-                                <Draggable  draggable={draggable} getScrollContainer={() => this.getScrollContainer()}
+                                <Draggable  draggable={draggable && (this.props.enableStructureEditing)} getScrollContainer={() => this.getScrollContainer()}
                                     onDragEnd={(x, y) => { this.onDragEnd(instanceId, x, y) }}
                                 >
                                     <PluginIcon pluginType={iconType} size={24} pluginMissing={pluginNotFound} opacity={enabled? 0.99:0.6}  />                                    

react/src/PerformanceView.tsx

@@ -0,0 +1,318 @@
+// Copyright (c) 2024 Robin Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+import { Theme } from '@mui/material/styles';
+import { WithStyles } from '@mui/styles';
+import createStyles from '@mui/styles/createStyles';
+import withStyles from '@mui/styles/withStyles';
+import { PiPedalModel, PiPedalModelFactory, PresetIndex } from './PiPedalModel';
+import ResizeResponsiveComponent from './ResizeResponsiveComponent';
+import ArrowBackIcon from '@mui/icons-material/ArrowBack';
+import IconButton from '@mui/material/IconButton';
+import AppBar from '@mui/material/AppBar';
+import SnapshotPanel from './SnapshotPanel';
+import ArrowLeftOutlined from '@mui/icons-material/ArrowLeft';
+import ArrowRightOutlined from '@mui/icons-material/ArrowRight';
+import Select from '@mui/material/Select';
+import MenuItem from '@mui/material/MenuItem';
+import { isDarkMode } from './DarkMode';
+import { BankIndex } from './Banks';
+import SnapshotEditor from './SnapshotEditor';
+import { Snapshot } from './Pedalboard';
+
+
+const selectColor = isDarkMode() ? "#888" : "#FFFFFF";
+
+const styles = (theme: Theme) => createStyles({
+    frame: {
+        position: "absolute", display: "flex", flexDirection: "column", flexWrap: "nowrap",
+        justifyContent: "flex-start", left: "0px", top: "0px", bottom: "0px", right: "0px", overflow: "hidden"
+    },
+    select: { // fu fu fu.Overrides for white selector on dark background.
+        '&:before': {
+            borderColor: selectColor,
+        },
+        '&:after': {
+            borderColor: selectColor,
+        },
+        '&:hover:not(.Mui-disabled):before': {
+            borderColor: selectColor,
+        }
+    },
+    select_icon: {
+        fill: selectColor,
+    },
+});
+
+
+interface PerformanceViewProps extends WithStyles<typeof styles> {
+    onClose: () => void,
+    theme: Theme
+}
+
+interface PerformanceViewState {
+    wrapSelects: boolean
+    presets: PresetIndex;
+    banks: BankIndex;
+    showSnapshotEditor: boolean;
+    snapshotEditorIndex: number;
+}
+
+
+export const PerformanceView =
+    withStyles(styles, { withTheme: true })(
+        class extends ResizeResponsiveComponent<PerformanceViewProps, PerformanceViewState> {
+            model: PiPedalModel;
+
+            constructor(props: PerformanceViewProps) {
+                super(props);
+                this.model = PiPedalModelFactory.getInstance();
+                // let pedalboard = this.model.pedalboard.get();
+                // let selectedPedal = pedalboard.getFirstSelectableItem();
+
+                this.state = {
+                    presets: this.model.presets.get(),
+                    banks: this.model.banks.get(),
+                    wrapSelects: false,
+                    showSnapshotEditor: false,
+                    snapshotEditorIndex: 0
+                };
+                this.onPresetsChanged = this.onPresetsChanged.bind(this);
+                this.onBanksChanged = this.onBanksChanged.bind(this);
+            }
+            onWindowSizeChanged(width: number, height: number): void {
+                this.setState({ wrapSelects: width < 700 });
+            }
+
+            onPresetsChanged(newValue: PresetIndex) {
+                this.setState({ presets: this.model.presets.get() })
+            }
+            onBanksChanged(newValue: BankIndex) {
+                this.setState({ banks: this.model.banks.get() })
+            }
+            componentDidMount(): void {
+                super.componentDidMount();
+                this.model.presets.addOnChangedHandler(this.onPresetsChanged);
+                this.model.banks.addOnChangedHandler(this.onBanksChanged);
+                this.setState({
+                    presets: this.model.presets.get(),
+                    banks: this.model.banks.get()
+                });
+            }
+            componentWillUnmount(): void {
+                this.model.presets.removeOnChangedHandler(this.onPresetsChanged);
+                this.model.banks.removeOnChangedHandler(this.onBanksChanged);
+                super.componentWillUnmount();
+            }
+            handlePresetSelectClose(event: any): void {
+                let value = event.currentTarget.getAttribute("data-value");
+                if (value && value.length > 0) {
+                    this.model.loadPreset(parseInt(value));
+                }
+            }
+
+            handleBankSelectClose(event: any): void {
+                let value = event.currentTarget.getAttribute("data-value");
+                if (value && value.length > 0) {
+                    this.model.openBank(parseInt(value));
+                }
+            }
+            handleOnEdit(index: number): boolean {
+                // load it so we can edit it.
+                this.model.selectSnapshot(index);
+                this.setState({
+                    showSnapshotEditor: true,
+                    snapshotEditorIndex: index
+                });
+                return true;
+            }
+            handleSnapshotEditOk(index: number, name: string, color: string,newSnapshots: (Snapshot|null)[])
+            {
+                // results have been sent to the server. we would perform a  short-cut commit to our local state, to avoid laggy display updates.
+                // but we don't actually have that in our state.
+
+            }
+
+            handlePreviousBank()
+            {
+                this.model.previousBank();
+            }
+
+            handleNextBank()
+            {
+                this.model.nextBank();
+            }
+            handlePreviousPreset()
+            {
+                this.model.previousPreset();
+            }
+            handleNextPreset()
+            {
+                this.model.nextPreset();
+            }
+
+            render() {
+                let classes = this.props.classes;
+                let wrapSelects = this.state.wrapSelects;
+                let presets = this.state.presets;
+                let banks = this.state.banks;
+                return (
+                    <div className={this.props.classes.frame} style={{ overflow: "clip", height: "100%" }} >
+                        <div className={this.props.classes.frame} style={{ overflow: "clip", height: "100%" }} >
+                            <AppBar id="select-plugin-dialog-title"
+                                style={{
+                                    position: "static", flex: "0 0 auto", height: wrapSelects ? 104 : 54,
+                                    display: this.state.showSnapshotEditor ? "none" : undefined
+                                }}
+                            >
+                                <div style={{
+                                    display: "flex", flexFlow: "row nowrap", alignContent: "center",
+                                    paddingTop: 3, paddingBottom: 3, paddingRight: 8, paddingLeft: 8,
+                                    alignItems: "start"
+                                }}>
+                                    <IconButton aria-label="menu" color="inherit"
+                                        onClick={() => { this.props.onClose(); }} style={{ flex: "0 0 auto" }} >
+                                        <ArrowBackIcon />
+                                    </IconButton>
+
+                                    <div style={{
+                                        flex: "1 1 1px", display: "flex",
+                                        flexFlow: wrapSelects ? "column nowrap" : "row nowrap",
+                                        alignItems: wrapSelects ? "stretch" : undefined,
+                                        justifyContent: wrapSelects ? undefined : "space-evenly",
+                                        marginLeft: 8,
+                                        gap: 8
+
+                                    }}>
+                                        {/********* BANKS *******************/}
+                                        <div style={{ flex: "1 1 1px", display: "flex", flexFlow: "row nowrap", maxWidth: 500 }}>
+                                            <IconButton
+                                                aria-label="previous-bank"
+                                                onClick={() => { this.handlePreviousBank(); }}
+                                                color="inherit"
+                                                style={{
+                                                    borderTopRightRadius: "3px", borderBottomRightRadius: "3px", marginRight: 4
+                                                }}
+                                            >
+                                                <ArrowLeftOutlined style={{ opacity: 0.75 }} />
+                                            </IconButton>
+
+                                            <Select variant="standard"
+                                                className={classes.select}
+                                                style={{ flex: "1 1 1px", width: "100%", position: "relative", top: 0, color: "#FFFFFF" }} disabled={false}
+                                                displayEmpty
+                                                onClose={(e) => this.handleBankSelectClose(e)}
+                                                value={banks.selectedBank === 0 ? undefined : banks.selectedBank}
+                                                inputProps={{
+                                                    classes: { icon: classes.select_icon },
+                                                    'aria-label': "Select preset"
+                                                }}
+                                            >
+                                                {
+                                                    banks.entries.map((entry) => {
+                                                        return (
+                                                            <MenuItem key={entry.instanceId} value={entry.instanceId} >
+                                                                {entry.name}
+                                                            </MenuItem>
+                                                        );
+                                                    })
+                                                }
+                                            </Select>
+
+                                            <IconButton
+                                                aria-label="next-bank"
+                                                onClick={() => { this.handleNextBank(); }}
+                                                color="inherit"
+                                                style={{ borderTopLeftRadius: "3px", borderBottomLeftRadius: "3px", marginLeft: 4 }}
+                                            >
+                                                <ArrowRightOutlined style={{ opacity: 0.75 }} />
+                                            </IconButton>
+
+                                        </div>
+                                        {/********* PRESETS *******************/}
+                                        <div style={{ flex: "1 1 1px", display: "flex", flexFlow: "row nowrap", maxWidth: 500 }}>
+                                            <IconButton
+                                                aria-label="previous-presest"
+                                                onClick={() => { this.handlePreviousPreset(); }}
+                                                color="inherit"
+                                                style={{ borderTopRightRadius: "3px", borderBottomRightRadius: "3px", marginRight: 4 }}
+                                            >
+                                                <ArrowLeftOutlined style={{ opacity: 0.75 }} />
+                                            </IconButton>
+                                            <Select variant="standard"
+                                                className={classes.select}
+                                                style={{
+                                                    flex: "1 1 1px", width: "100%", color: "#FFFFFF"
+                                                }} disabled={false}
+                                                displayEmpty
+                                                onClose={(e) => this.handlePresetSelectClose(e)}
+                                                value={presets.selectedInstanceId === 0 ? '' : presets.selectedInstanceId}
+
+                                                inputProps={{
+                                                    classes: { icon: classes.select_icon },
+                                                    'aria-label': "Select preset"
+                                                }
+                                                }
+                                            >
+                                                {
+                                                    presets.presets.map((preset) => {
+                                                        return (
+                                                            <MenuItem key={preset.instanceId} value={preset.instanceId} >
+                                                                {preset.name}
+                                                            </MenuItem>
+                                                        );
+                                                    })
+                                                }
+                                            </Select>
+
+                                            <IconButton
+                                                aria-label="next-preset"
+                                                onClick={() => { this.handleNextPreset(); }}
+                                                color="inherit"
+                                                style={{ borderTopLeftRadius: "3px", borderBottomLeftRadius: "3px", marginLeft: 4 }}
+                                            >
+                                                <ArrowRightOutlined style={{ opacity: 0.75 }} />
+                                            </IconButton>
+
+                                        </div>
+                                    </div>
+                                </div>
+                            </AppBar >
+                            <div style={{ flex: "1 0 auto", display: "flex", marginTop: 16 }}>
+                                <SnapshotPanel onEdit={(index) => { return this.handleOnEdit(index); }} />
+                            </div>
+                        </div>
+                        {this.state.showSnapshotEditor && (
+                            <SnapshotEditor snapshotIndex={this.state.snapshotEditorIndex} 
+                                onClose={() => { 
+                                    this.setState({ showSnapshotEditor: false });
+                                }}
+                                onOk={(index,name,color,newSnapshots)=>{
+                                    this.setState({ showSnapshotEditor: false});
+                                    this.handleSnapshotEditOk(index,name,color,newSnapshots);
+                                }}
+                             />
+                        )}
+                    </div >
+                )
+            }
+        }
+    );
+

react/src/PiPedalModel.tsx

@@ -22,7 +22,7 @@ import { UiPlugin, UiControl, PluginType, UiFileProperty } from './Lv2Plugin';
 import { PiPedalArgumentError, PiPedalStateError } from './PiPedalError';
 import { UpdateStatus, UpdatePolicyT } from './Updater';
 import { ObservableProperty } from './ObservableProperty';
-import { Pedalboard, PedalboardItem, ControlValue } from './Pedalboard'
+import { Pedalboard, PedalboardItem, ControlValue, Snapshot } from './Pedalboard'
 import PluginClass from './PluginClass';
 import PiPedalSocket, { PiPedalMessageHeader } from './PiPedalSocket';
 import { nullCast } from './Utility'
@@ -57,7 +57,7 @@ export enum State {
 
 class UpdatedError extends Error {
 };
-export function wantsLoadingScreen(state: State) {
+export function wantsReloadingScreen(state: State) {
     return state >= State.Reconnecting;
 }
 
@@ -368,7 +368,7 @@ export class PiPedalModel //implements PiPedalModel
     clientId: number = -1;
 
     serverVersion?: PiPedalVersion;
-    countryCodes: {[Name: string]: string} = {};
+    countryCodes: { [Name: string]: string } = {};
 
     socketServerUrl: string = "";
     varServerUrl: string = "";
@@ -390,6 +390,8 @@ export class PiPedalModel //implements PiPedalModel
     showStatusMonitor: ObservableProperty<boolean> = new ObservableProperty<boolean>(true);
 
     pedalboard: ObservableProperty<Pedalboard> = new ObservableProperty<Pedalboard>(new Pedalboard());
+    presetChanged: ObservableProperty<boolean> = new ObservableProperty<boolean>(false);
+    selectedSnapshot: ObservableProperty<number> = new ObservableProperty<number>(-1);
     plugin_classes: ObservableProperty<PluginClass> = new ObservableProperty<PluginClass>(new PluginClass());
     jackConfiguration: ObservableProperty<JackConfiguration> = new ObservableProperty<JackConfiguration>(new JackConfiguration());
     jackSettings: ObservableProperty<JackChannelSelection> = new ObservableProperty<JackChannelSelection>(new JackChannelSelection());
@@ -498,6 +500,10 @@ export class PiPedalModel //implements PiPedalModel
         return true;
 
     }
+    private setModelPedalboard(pedalboard: Pedalboard) {
+        this.pedalboard.set(pedalboard);
+        this.selectedSnapshot.set(pedalboard.selectedSnapshot);
+    }
     onSocketMessage(header: PiPedalMessageHeader, body?: any) {
         if (this.visibilityState.get() === VisibilityState.Hidden) return;
 
@@ -558,6 +564,19 @@ export class PiPedalModel //implements PiPedalModel
             let channelSelectionBody = body as ChannelSelectionChangedBody;
             let channelSelection = new JackChannelSelection().deserialize(channelSelectionBody.jackChannelSelection);
             this.jackSettings.set(channelSelection);
+        } else if (message === "onSelectedSnapshotChanged") {
+            let selectedSnapshot = body as number;
+            this.pedalboard.get().selectedSnapshot = selectedSnapshot;
+            this.selectedSnapshot.set(selectedSnapshot);
+        } else if (message === "onPresetChanged") {
+            let changed = body as boolean;
+
+            if (this.presets.get().presetChanged !== changed) {
+                let newPresets = this.presets.get().clone(); // deep clone.
+                newPresets.presetChanged = changed;
+                this.presets.set(newPresets);
+            }
+            this.presetChanged.set(changed);
         } else if (message === "onPresetsChanged") {
             let presetsChangedBody = body as PresetsChangedBody;
             let presets = new PresetIndex().deserialize(presetsChangedBody.presets);
@@ -580,7 +599,7 @@ export class PiPedalModel //implements PiPedalModel
             );
         } else if (message === "onPedalboardChanged") {
             let pedalChangedBody = body as PedalboardChangedBody;
-            this.pedalboard.set(new Pedalboard().deserialize(pedalChangedBody.pedalboard));
+            this.setModelPedalboard(new Pedalboard().deserialize(pedalChangedBody.pedalboard));
 
         } else if (message === "onMidiValueChanged") {
             let controlChangedBody = body as ControlChangedBody;
@@ -599,6 +618,14 @@ export class PiPedalModel //implements PiPedalModel
             let isNote = body.isNote as boolean;
             let noteOrControl = body.noteOrControl as number;
             this.handleNotifyMidiListener(clientHandle, isNote, noteOrControl);
+        } else if (message === "onNotifyPathPatchPropertyChanged") {
+            let instanceId = body.instanceId as number;
+            let propertyUri = body.propertyUri as string;
+            let atomJson = body.atomJson as any;
+            this.handleNotifyPathPatchPropertyChanged(instanceId, propertyUri, atomJson);
+            if (header.replyTo) {
+                this.webSocket?.reply(header.replyTo, "onNotifyPatchProperty", true);
+            }
         } else if (message === "onNotifyPatchProperty") {
             let clientHandle = body.clientHandle as number;
             let instanceId = body.instanceId as number;
@@ -649,8 +676,7 @@ export class PiPedalModel //implements PiPedalModel
         } else if (message === "onUpdateStatusChanged") {
             let updateStatus = new UpdateStatus().deserialize(body);
             this.onUpdateStatusChanged(updateStatus);
-        } else if (message === "onNetworkChanging")
+        } else if (message === "onNetworkChanging") {
-        {
             this.onNetworkChanging(body as boolean);
         }
     }
@@ -687,8 +713,7 @@ export class PiPedalModel //implements PiPedalModel
     private lastCanUpdateNow: boolean = false;
     private updatePromptForUpdate() {
         this.clearPromptForUpdateTimer();
-        if (!this.enableAutoUpdate)
+        if (!this.enableAutoUpdate) {
-        {
             return;
         }
 
@@ -702,7 +727,7 @@ export class PiPedalModel //implements PiPedalModel
             let nDate = Date.now();
 
             let now: Date = new Date(nDate);
-            let maxDate: Date = new Date(nDate + 86400000*2); // sanity check for systems with unstable system clock
+            let maxDate: Date = new Date(nDate + 86400000 * 2); // sanity check for systems with unstable system clock
 
             timeEnabled = (updateLaterTime < now || updateLaterTime >= maxDate)
         }
@@ -710,13 +735,11 @@ export class PiPedalModel //implements PiPedalModel
         let statusEnabled = updateStatus.isOnline && updateStatus.isValid && updateStatus.getActiveRelease().updateAvailable;
 
         let canUpdateNow: boolean = (stateEnabled && timeEnabled && statusEnabled);
-        if (updateStatus.updatePolicy === UpdatePolicyT.Disable)
+        if (updateStatus.updatePolicy === UpdatePolicyT.Disable) {
-        {
             canUpdateNow = false;
         }
 
-        if (canUpdateNow && canUpdateNow !== this.lastCanUpdateNow)
+        if (canUpdateNow && canUpdateNow !== this.lastCanUpdateNow) {
-        {
             this.showUpdateDialogValue = true; // make the dialog sticky so it can show OK button
         }
         this.lastCanUpdateNow = canUpdateNow;
@@ -795,26 +818,23 @@ export class PiPedalModel //implements PiPedalModel
 
     androidReconnectTimeout?: NodeJS.Timeout = undefined;
 
-    cancelAndroidReconnectTimer()
+    cancelAndroidReconnectTimer() {
-    {
         if (this.androidReconnectTimeout) {
             clearTimeout(this.androidReconnectTimeout);
             this.androidReconnectTimeout = undefined;
         }
     }
 
-    startAndroidReconnectTimer()
+    startAndroidReconnectTimer() {
-    {
         this.cancelAndroidReconnectTimer();
-        this.androidReconnectTimeout = setTimeout(()=>{
+        this.androidReconnectTimeout = setTimeout(() => {
             this.androidReconnectTimeout = undefined;
             this.androidHost?.setDisconnected(true);
-        },20*1000);
+        }, 20 * 1000);
     }
     onSocketConnectionLost() {
         // remove all the events and subscriptions we have.
-        if (this.isClosed)
+        if (this.isClosed) {
-        {
             return; // page unloading. do NOT change the UI.
         }
         this.vuSubscriptions = [];
@@ -822,8 +842,7 @@ export class PiPedalModel //implements PiPedalModel
 
         if (this.isAndroidHosted()) {
             // if unexpected, go back to the device browser immediately.
-            if (this.reconnectReason === ReconnectReason.Disconnected)
+            if (this.reconnectReason === ReconnectReason.Disconnected) {
-            {
                 this.androidHost?.setDisconnected(true);
             } else {
                 this.startAndroidReconnectTimer();
@@ -856,7 +875,7 @@ export class PiPedalModel //implements PiPedalModel
                 return this.getWebSocket().request<Pedalboard>("currentPedalboard");
             })
             .then(data => {
-                this.pedalboard.set(new Pedalboard().deserialize(data));
+                this.setModelPedalboard(new Pedalboard().deserialize(data));
 
                 return this.getWebSocket().request<boolean>("getShowStatusMonitor");
             })
@@ -923,8 +942,7 @@ export class PiPedalModel //implements PiPedalModel
                 this.setState(State.Ready);
             })
             .catch((what) => {
-                if (what instanceof UpdatedError)
+                if (what instanceof UpdatedError) {
-                {
                     // do nothing. a page reload is imminent and unavoidable as soon as we return to the dispatcher.
                 } else {
                     this.onError(what.toString());
@@ -1002,7 +1020,7 @@ export class PiPedalModel //implements PiPedalModel
                 return response.json();
             })
             .then((countryCodes) => {
-                this.countryCodes = countryCodes as {[Name: string]: string};
+                this.countryCodes = countryCodes as { [Name: string]: string };
 
                 return this.getWebSocket().request<number>("hello");
             })
@@ -1031,7 +1049,7 @@ export class PiPedalModel //implements PiPedalModel
                         return this.getWebSocket().request<Pedalboard>("currentPedalboard");
                     })
                     .then(data => {
-                        this.pedalboard.set(new Pedalboard().deserialize(data));
+                        this.setModelPedalboard(new Pedalboard().deserialize(data));
 
                         return this.getWebSocket().request<any>("pluginClasses");
                     })
@@ -1120,17 +1138,16 @@ export class PiPedalModel //implements PiPedalModel
     }
 
 
-    onError(message: string| Error): void {
+    onError(message: string | Error): void {
         let m = message;
-        if (message instanceof Error)
+        if (message instanceof Error) {
-        {
             let e = message as Error;
             if (e.message) {
                 m = e.message as string;
             } else {
                 m = e.toString();
             }
-        } else{
+        } else {
             m = message.toString();
         }
         this.errorMessage.set(m);
@@ -1269,7 +1286,8 @@ export class PiPedalModel //implements PiPedalModel
             changed = item.setControlValue(controlValue.key, controlValue.value) || changed;
         }
         if (changed) {
-            this.pedalboard.set(newPedalboard);
+            newPedalboard.selectedSnapshot = -1;
+            this.setModelPedalboard(newPedalboard);
         }
     }
 
@@ -1354,6 +1372,33 @@ export class PiPedalModel //implements PiPedalModel
 
     }
 
+    nextBank() {
+        this.webSocket?.send("nextBank");
+    }
+    previousBank() {
+        this.webSocket?.send("previousBank");
+    }
+    nextPreset() {
+        this.webSocket?.send("nextPreset");
+    }
+    previousPreset() {
+        this.webSocket?.send("previousPreset");
+    }
+
+
+    selectSnapshot(index: number) {
+        this.webSocket?.send("setSnapshot", index);
+    }
+    setSnapshots(snapshots: (Snapshot | null)[], selectedSnapshot: number) {
+        let pedalboard = this.pedalboard.get().clone();
+        pedalboard.snapshots = snapshots;
+        if (selectedSnapshot !== -1) {
+            pedalboard.selectedSnapshot = selectedSnapshot;
+        }
+        this.setModelPedalboard(pedalboard);
+
+        this.webSocket?.send("setSnapshots", { snapshots: snapshots, selectedSnapshot: selectedSnapshot });
+    }
     private _setPedalboardPropertyValue(instanceId: number, propertyUri: string, value: any): void {
         let body: PatchPropertyChangedBody = {
             clientId: this.clientId,
@@ -1383,7 +1428,8 @@ export class PiPedalModel //implements PiPedalModel
         if (pedalboard.input_volume_db !== volume_db) {
             let newPedalboard = pedalboard.clone();
             newPedalboard.input_volume_db = volume_db;
-            this.pedalboard.set(newPedalboard);
+            newPedalboard.selectedSnapshot = -1;
+            this.setModelPedalboard(newPedalboard);
             changed = true;
         }
         if (changed) {
@@ -1411,7 +1457,8 @@ export class PiPedalModel //implements PiPedalModel
         if (pedalboard.output_volume_db !== volume_db) {
             let newPedalboard = pedalboard.clone();
             newPedalboard.output_volume_db = volume_db;
-            this.pedalboard.set(newPedalboard);
+            newPedalboard.selectedSnapshot = -1;
+            this.setModelPedalboard(newPedalboard);
             changed = true;
         }
         if (changed) {
@@ -1447,7 +1494,8 @@ export class PiPedalModel //implements PiPedalModel
             if (notifyServer) {
                 this._setServerControl("setControl", instanceId, key, value);
             }
-            this.pedalboard.set(newPedalboard);
+            newPedalboard.selectedSnapshot = -1;
+            this.setModelPedalboard(newPedalboard);
             for (let i = 0; i < this._controlValueChangeItems.length; ++i) {
                 let item = this._controlValueChangeItems[i];
                 if (instanceId === item.instanceId) {
@@ -1467,7 +1515,7 @@ export class PiPedalModel //implements PiPedalModel
         item.vstState = state;
 
         if (changed) {
-            this.pedalboard.set(newPedalboard);
+            this.setModelPedalboard(newPedalboard);
             if (notifyServer) {
                 this._setServerControl("setControl", instanceId, key, value);
             }
@@ -1499,7 +1547,8 @@ export class PiPedalModel //implements PiPedalModel
         let changed = value !== item.isEnabled;
         if (changed) {
             item.isEnabled = value;
-            this.pedalboard.set(newPedalboard);
+            newPedalboard.selectedSnapshot = -1;
+            this.setModelPedalboard(newPedalboard);
             if (notifyServer) {
                 let body: PedalboardItemEnableBody = {
                     clientId: this.clientId,
@@ -1548,8 +1597,16 @@ export class PiPedalModel //implements PiPedalModel
                 item.pluginName = plugin.name;
                 item.controlValues = this.getDefaultValues(item.uri);
                 item.isEnabled = true;
-                // lv2State: not valid. vstState : not valid.
+                item.lv2State = [false, {}];
-                this.pedalboard.set(newPedalboard);
+                item.vstState = "";
+                item.pathProperties = {};
+                for (let fileProperty of plugin.fileProperties) {
+                    // stringized json for an atom. see AtomConverter.hpp.
+                    //  null -> we've never seen a value.
+                    item.pathProperties[fileProperty.patchProperty] = "null";
+                }
+                newPedalboard.selectedSnapshot = -1;
+                this.setModelPedalboard(newPedalboard);
                 this.updateServerPedalboard()
                 return item.instanceId;
             }
@@ -1589,7 +1646,8 @@ export class PiPedalModel //implements PiPedalModel
 
         let result = newPedalboard.deleteItem(instanceId);
         if (result !== null) {
-            this.pedalboard.set(newPedalboard);
+            newPedalboard.selectedSnapshot = -1;
+            this.setModelPedalboard(newPedalboard);
             this.updateServerPedalboard();
         }
         return result;
@@ -1611,7 +1669,8 @@ export class PiPedalModel //implements PiPedalModel
         newPedalboard.deleteItem(fromInstanceId);
 
         newPedalboard.addBefore(fromItem, toInstanceId);
-        this.pedalboard.set(newPedalboard);
+        newPedalboard.selectedSnapshot = -1;
+        this.setModelPedalboard(newPedalboard);
         this.updateServerPedalboard();
 
     }
@@ -1631,7 +1690,8 @@ export class PiPedalModel //implements PiPedalModel
 
         newPedalboard.addAfter(fromItem, toInstanceId);
 
-        this.pedalboard.set(newPedalboard);
+        newPedalboard.selectedSnapshot = -1;
+        this.setModelPedalboard(newPedalboard);
         this.updateServerPedalboard();
     }
 
@@ -1652,7 +1712,8 @@ export class PiPedalModel //implements PiPedalModel
 
         newPedalboard.addToStart(fromItem);
 
-        this.pedalboard.set(newPedalboard);
+        newPedalboard.selectedSnapshot = -1;
+        this.setModelPedalboard(newPedalboard);
         this.updateServerPedalboard();
     }
     movePedalboardItemToEnd(instanceId: number): void {
@@ -1671,7 +1732,9 @@ export class PiPedalModel //implements PiPedalModel
 
         newPedalboard.addToEnd(fromItem);
 
-        this.pedalboard.set(newPedalboard);
+        newPedalboard.selectedSnapshot = -1;
+        this.setModelPedalboard(newPedalboard);
+
         this.updateServerPedalboard();
 
 
@@ -1697,7 +1760,9 @@ export class PiPedalModel //implements PiPedalModel
         let emptyItem = newPedalboard.createEmptyItem();
         newPedalboard.replaceItem(fromInstanceId, emptyItem);
         newPedalboard.replaceItem(toInstanceId, fromItem);
-        this.pedalboard.set(newPedalboard);
+
+        newPedalboard.selectedSnapshot = -1;
+        this.setModelPedalboard(newPedalboard);
         this.updateServerPedalboard();
 
     }
@@ -1720,7 +1785,8 @@ export class PiPedalModel //implements PiPedalModel
         }
         let newItem = newPedalboard.createEmptyItem();
         newPedalboard.addItem(newItem, instanceId, append);
-        this.pedalboard.set(newPedalboard);
+        newPedalboard.selectedSnapshot = -1;
+        this.setModelPedalboard(newPedalboard);
         this.updateServerPedalboard();
         return newItem.instanceId;
     }
@@ -1745,7 +1811,8 @@ export class PiPedalModel //implements PiPedalModel
         }
         let newItem = newPedalboard.createEmptySplit();
         newPedalboard.addItem(newItem, instanceId, append);
-        this.pedalboard.set(newPedalboard);
+        newPedalboard.selectedSnapshot = -1;
+        this.setModelPedalboard(newPedalboard);
         this.updateServerPedalboard();
         return newItem.instanceId;
 
@@ -1762,7 +1829,8 @@ export class PiPedalModel //implements PiPedalModel
         }
         newPedalboard.setItemEmpty(item);
 
-        this.pedalboard.set(newPedalboard);
+        newPedalboard.selectedSnapshot = -1;
+        this.setModelPedalboard(newPedalboard);
         this.updateServerPedalboard();
         return item.instanceId;
 
@@ -1956,17 +2024,16 @@ export class PiPedalModel //implements PiPedalModel
         return this.copyPreset(instanceId, -1);
     }
 
-    showAlert(message: string| Error): void {
+    showAlert(message: string | Error): void {
         let m = message;
-        if (message instanceof Error)
+        if (message instanceof Error) {
-        {
             let e = message as Error;
             if (e.message) {
                 m = e.message as string;
             } else {
                 m = e.toString();
             }
-        } else{
+        } else {
             m = message.toString();
         }
         this.alertMessage.set(m);
@@ -2265,7 +2332,8 @@ export class PiPedalModel //implements PiPedalModel
         let newPedalboard = pedalboard.clone();
         this.updateVst3State(newPedalboard);
         if (newPedalboard.setMidiBinding(instanceId, midiBinding)) {
-            this.pedalboard.set(newPedalboard);
+            newPedalboard.selectedSnapshot = -1;
+            this.setModelPedalboard(newPedalboard);
 
 
             // notify the server.
@@ -2329,8 +2397,31 @@ export class PiPedalModel //implements PiPedalModel
         }
     }
 
+    private handleNotifyPathPatchPropertyChanged(
+        instanceId: number, propertyUri: string, jsonObject: any
+    ) {
+        let pedalboard = this.pedalboard.get();
+        let pedalboardItem = pedalboard.getItem(instanceId);
+        if (pedalboardItem) {
+            pedalboardItem.pathProperties[propertyUri] = jsonObject;
+        }
+        for (let i = 0; i < this.monitorPatchPropertyListeners.length; ++i) {
+            let listener = this.monitorPatchPropertyListeners[i];
+            if (listener.instanceId === instanceId) {
+                listener.callback(instanceId, propertyUri, jsonObject);
+            }
+        }
 
+    }
     private handleNotifyPatchProperty(clientHandle: number, instanceId: number, propertyUri: string, jsonObject: any) {
+        // yyy this whole path is obsolete.  We now get property change notifications
+        // always, since the entire pedalboard must track excactly.
+        // Review carefully.
+        let pedalboard = this.pedalboard.get();
+        let pedalboardItem = pedalboard.getItem(instanceId);
+        if (pedalboardItem) {
+            pedalboardItem.pathProperties[propertyUri] = JSON.stringify(jsonObject);
+        }
         for (let i = 0; i < this.monitorPatchPropertyListeners.length; ++i) {
             let listener = this.monitorPatchPropertyListeners[i];
             if (listener.handle === clientHandle && listener.instanceId === instanceId) {
@@ -2367,7 +2458,13 @@ export class PiPedalModel //implements PiPedalModel
     download(targetType: string, instanceId: number | string): void {
         if (instanceId === -1) return;
         let url = this.varServerUrl + targetType + "?id=" + instanceId;
-        window.open(url, "_blank");
+
+        // window.open(url, "_blank");
+        // download with no flashing temporary tab.
+        let link = window.document.createElement("A") as HTMLLinkElement;
+        link.href = url;
+        link.setAttribute("download", "");
+        link.click();
     }
 
     uploadFile(uploadPage: string, file: File, contentType: string = "application/octet-stream", abortController?: AbortController): Promise<string> {
@@ -2611,8 +2708,7 @@ export class PiPedalModel //implements PiPedalModel
                 wifiConfigSettings.hasPassword = false;
                 wifiConfigSettings.password = "";
             } else {
-                if (wifiConfigSettings.hasPassword)
+                if (wifiConfigSettings.hasPassword) {
-                    {
                     wifiConfigSettings.hasSavedPassword = true;
                 }
             }
@@ -2714,7 +2810,7 @@ export class PiPedalModel //implements PiPedalModel
     }
 
 
-    getKnownWifiNetworks() : Promise<string[]> {
+    getKnownWifiNetworks(): Promise<string[]> {
         let result = new Promise<string[]>((resolve, reject) => {
             if (!this.webSocket) {
                 reject("Connection closed.");
@@ -2945,81 +3041,67 @@ export class PiPedalModel //implements PiPedalModel
     private expectNetworkChangeTimeout?: NodeJS.Timeout = undefined;
     private hotspotReconnectTimer?: NodeJS.Timeout = undefined;
 
-    async detectServer(address: string)
+    async detectServer(address: string) {
-    {
         let port = window.location.port;
         let newUrl = new URL("http://" + address + ":" + port + "/manifest.json");
 
         try {
             let response = await fetch(newUrl);
-            if (response.ok)
+            if (response.ok) {
-            {
+                return "http://" + address + ":" + port;
-                return "http://" + address +":"+ port;
             }
             return "";
-        } catch (error: any)
+        } catch (error: any) {
-        {
             return "";
         }
     }
     async pollForLiveServer() {
         let wifiConfigSettings = this.wifiConfigSettings.get();
-        if (wifiConfigSettings.mdnsName.length !== 0)
+        if (wifiConfigSettings.mdnsName.length !== 0) {
-        {
             let newUrl = await this.detectServer(wifiConfigSettings.mdnsName);
-            if (newUrl.length !== 0)
+            if (newUrl.length !== 0) {
-            {
                 return newUrl;
             }
         }
-        if (this.networkChanging_expectHotspot)
+        if (this.networkChanging_expectHotspot) {
-        {
             let newUrl = await this.detectServer("10.40.0.1");
-            if (newUrl.length !== 0)
+            if (newUrl.length !== 0) {
-            {
                 return newUrl;
             }
         }
         return "";
     }
-    cancelHotspotReconnectTimer()
+    cancelHotspotReconnectTimer() {
-    {
+        if (this.hotspotReconnectTimer) {
-        if (this.hotspotReconnectTimer)
-        {
             clearTimeout(this.hotspotReconnectTimer);
         }
 
     }
-    startHotspotReconnectTimer()
+    startHotspotReconnectTimer() {
-    {
         // poll for access to a running pipedal server
         this.hotspotReconnectTimer = setTimeout(
             async () => {
                 let newUrl = await this.pollForLiveServer();
-                if (newUrl.length === 0)
+                if (newUrl.length === 0) {
-                {
                     this.startHotspotReconnectTimer();
                 } else {
                     this.cancelOnNetworkChanging();
                     window.location.replace(newUrl);
                 }
             },
-            5*1000);
+            5 * 1000);
 
     }
-    cancelOnNetworkChanging()
+    cancelOnNetworkChanging() {
-    {
         this.cancelHotspotReconnectTimer();
-        if (this.expectNetworkChangeTimeout)
+        if (this.expectNetworkChangeTimeout) {
-        {
             clearTimeout(this.expectNetworkChangeTimeout);
             this.expectNetworkChangeTimeout = undefined;
         }
         this.networkChanging = false;
         this.expectDisconnect(ReconnectReason.Disconnected);
     }
-    onNetworkChanging(hotspotConnected: boolean)
+    onNetworkChanging(hotspotConnected: boolean) {
-    {
         this.cancelOnNetworkChanging();
 
         this.networkChanging = true;
@@ -3030,7 +3112,7 @@ export class PiPedalModel //implements PiPedalModel
             () => {
                 this.cancelOnNetworkChanging();
             },
-            30*1000);
+            30 * 1000);
 
     }
 };

react/src/PluginControlView.tsx

@@ -526,6 +526,7 @@ const PluginControlView =
                 return false;
             }
 
+            controlKeyIndex : number = 0;
             controlNodesToNodes(nodes: (ReactNode | ControlGroup)[]): ReactNode[] {
                 let classes = this.props.classes;
                 let isLandscapeGrid = this.state.landscapeGrid;
@@ -542,7 +543,7 @@ const PluginControlView =
                             let item = controlGroup.controls[j];
                             controls.push(
                                 (
-                                    <div className={classes.controlPadding}>
+                                    <div key={"ctl"+(this.controlKeyIndex++)} className={classes.controlPadding}>
                                         {item}
                                     </div>
 
@@ -551,7 +552,7 @@ const PluginControlView =
                         }
 
                         result.push((
-                            <div className={!isLandscapeGrid ? classes.portGroup : classes.portGroupLandscape}>
+                            <div key={"ctl"+(this.controlKeyIndex++)} className={!isLandscapeGrid ? classes.portGroup : classes.portGroupLandscape}>
                                 <div className={classes.portGroupTitle}>
                                     <Typography noWrap variant="caption" >{controlGroup.name}</Typography>
                                 </div>
@@ -565,7 +566,7 @@ const PluginControlView =
 
                     } else {
                         result.push((
-                            <div className={hasGroups ? classes.portgroupControlPadding : classes.controlPadding} >
+                            <div key={"ctl"+(this.controlKeyIndex++)} className={hasGroups ? classes.portgroupControlPadding : classes.controlPadding} >
                                 {node as ReactNode}
                             </div>
                         ));
@@ -583,6 +584,7 @@ const PluginControlView =
 
 
             render(): ReactNode {
+                this.controlKeyIndex = 0; 
                 let classes = this.props.classes;
                 let pedalboardItem: PedalboardItem;
                 let pedalboard = this.model.pedalboard.get();

react/src/SnapshotColors.tsx

@@ -0,0 +1,54 @@
+/*
+ * MIT License
+ * 
+ * Copyright (c) 2024 Robin E. R. Davies
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+const darkcolors: string[] = 
+[
+        "#b71C1C","#880E4F","#4A148c","#311B92","#1A237E","#0D47A1","#01579B","#006064","#004D40"
+];
+
+const lighcolors: string[] = [
+        "#FFcDD2","#F8BBd0","#E1BEE7","#D1c4E9","#C5CAE9","#BBDEFB","#B3E5FC","#B2EbF2","B2DFDB"
+];
+export function getLightSnapshotcolors() {
+    let result:string[]  = [];
+    for (let h = 0; h < 360;  h += 30)
+    {
+        result.push("hsl(" + h + ",100%,79%)");
+    }
+    return result;
+}
+
+export function getDarkSnapshotColors() {
+    let result:string[]  = [];
+    for (let h = 0; h < 360;  h += 30)
+    {
+        result.push("hsl(" + h + ",90%,20%)");
+    }
+    return result;
+}
+
+export function getSnapshotColors() {
+    return getDarkSnapshotColors();
+}
+

react/src/SnapshotDialog.tsx

@@ -0,0 +1,131 @@
+/* eslint-disable @typescript-eslint/no-unused-vars */
+/*
+* MIT License
+* 
+* Copyright (c) 2024 Robin E. R. Davies
+* 
+* Permission is hereby granted, free of charge, to any person obtaining a copy of
+* this software and associated documentation files (the "Software"), to deal in
+* the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+* of the Software, and to permit persons to whom the Software is furnished to do
+* so, subject to the following conditions:
+* 
+* The above copyright notice and this permission notice shall be included in all
+* copies or substantial portions of the Software.
+* 
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+* SOFTWARE.
+*/
+
+import React from 'react';
+import Typography from '@mui/material/Typography';
+import DialogEx from './DialogEx';
+import DialogContent from '@mui/material/DialogContent';
+import DialogTitle from '@mui/material/DialogTitle';
+import ArrowBackIcon from '@mui/icons-material/ArrowBack';
+import IconButton from '@mui/material/IconButton';
+import { PiPedalModel, PiPedalModelFactory } from './PiPedalModel';
+import ResizeResponsiveComponent from './ResizeResponsiveComponent';
+import { TransitionProps } from '@mui/material/transitions';
+
+import Fade from '@mui/material/Fade';
+import SnapshotPanel from './SnapshotPanel';
+
+const styles = {
+    dialogPaper: {
+        minHeight: '80vh',
+        maxHeight: '80vh',
+    },
+};
+
+
+const Transition = React.forwardRef(function Transition(
+    props: TransitionProps & {
+        children: React.ReactElement<any, any>;
+    },
+    ref: React.Ref<unknown>,
+) {
+    return <Fade in={true} ref={ref} {...props} />;
+});
+
+
+
+export interface SnapshotDialogProps {
+    open: boolean,
+    onOk: () => void,
+};
+
+export interface SnapshotDialogState {
+    fullScreen: boolean,
+};
+
+export default class SnapshotDialog extends ResizeResponsiveComponent<SnapshotDialogProps, SnapshotDialogState> {
+    private model: PiPedalModel;
+
+    constructor(props: SnapshotDialogProps) {
+        super(props);
+        this.model = PiPedalModelFactory.getInstance();
+        this.state = {
+            fullScreen: this.getFullScreen(),
+        };
+    }
+
+    componentDidMount(): void {
+        super.componentDidMount();
+    }
+
+    componentWillUnmount(): void {
+        super.componentWillUnmount();
+
+    }
+
+    getFullScreen() {
+        return window.innerHeight < 450;
+    }
+    onWindowSizeChanged(width: number, height: number): void {
+        this.setState(
+            {
+                fullScreen: this.getFullScreen(),
+            }
+        );
+    }
+
+
+    render() {
+        return (
+            <DialogEx fullWidth={true} tag="shapshot" open={this.props.open} onClose={() => this.props.onOk()} fullScreen={this.state.fullScreen}
+                TransitionComponent={Transition} keepMounted
+                style={{ userSelect: "none", }}
+                PaperProps={{
+                    style: {
+                      maxWidth: '1000px'
+                      
+                    },
+                  }}
+            >
+                <DialogTitle>
+                    <div>
+                        <IconButton edge="start" color="inherit" onClick={() => { this.props.onOk(); }} aria-label="back"
+                        >
+                            <ArrowBackIcon fontSize="small" style={{ opacity: "0.6" }} />
+                        </IconButton>
+                        <Typography display="inline" variant="body1" color="textSecondary" >Snapshots</Typography>
+                    </div>
+
+                </DialogTitle>
+                <DialogContent style={{
+                    overflow: "hidden", margin: 0, height: "80vh",
+                    paddingLeft: 16, paddingRight: 16, paddingTop: 0, paddingBottom: 24,
+                }}>
+                    <SnapshotPanel panelHeight="80vh" />
+                </DialogContent>
+            </DialogEx>
+        );
+    }
+}

react/src/SnapshotEditor.tsx

@@ -0,0 +1,345 @@
+// Copyright (c) 2024 Robin Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import { WithStyles } from '@mui/styles';
+import ArrowBackIcon from '@mui/icons-material/ArrowBack';
+import CloseIcon from '@mui/icons-material/Close';
+import AppBar from '@mui/material/AppBar';
+import Toolbar from '@mui/material/Toolbar';
+import CssBaseline from '@mui/material/CssBaseline';
+import createStyles from '@mui/styles/createStyles';
+import withStyles from '@mui/styles/withStyles';
+import IconButton from '@mui/material/IconButton';
+import FullscreenIcon from '@mui/icons-material/Fullscreen';
+import FullscreenExitIcon from '@mui/icons-material/FullscreenExit';
+import ResizeResponsiveComponent from './ResizeResponsiveComponent';
+import { PiPedalModelFactory, PiPedalModel, State, ZoomedControlInfo } from './PiPedalModel';
+import ZoomedUiControl from './ZoomedUiControl'
+import MainPage from './MainPage';
+import JackStatusView from './JackStatusView';
+import { Theme } from '@mui/material/styles';
+import { isDarkMode } from './DarkMode';
+import Typography from '@mui/material/Typography';
+import TextField from '@mui/material/TextField';
+import { Snapshot } from './Pedalboard';
+import ColorDropdownButton from './ColorDropdownButton';
+
+
+const selectColor = isDarkMode() ? "#888" : "#FFFFFF";
+
+
+const appStyles = (theme: Theme) => createStyles({
+    "&": { // :root
+        colorScheme: (isDarkMode() ? "dark" : "light")
+    },
+
+
+    mainFrame: {
+        overflow: "hidden",
+        display: "flex",
+        flexFlow: "column",
+        marginTop: 8,
+        flex: "1 1 100%"
+    },
+    heroContent: {
+        backgroundColor: theme.mainBackground,
+        position: "relative",
+        height: "100%",
+        width: "100%"
+    },
+    shadowCatcher: {
+        backgroundColor: theme.mainBackground
+    },
+
+    select: { // fu fu fu.Overrides for white selector on dark background.
+        '&:before': {
+            borderColor: selectColor,
+        },
+        '&:after': {
+            borderColor: selectColor,
+        },
+        '&:hover:not(.Mui-disabled):before': {
+            borderColor: selectColor,
+        }
+    },
+    select_icon: {
+        fill: selectColor,
+    }
+
+
+});
+
+
+function supportsFullScreen(): boolean {
+    let doc: any = window.document;
+    let docEl: any = doc.documentElement;
+    var requestFullScreen = docEl.requestFullscreen || docEl.mozRequestFullScreen || docEl.webkitRequestFullScreen || docEl.msRequestFullscreen;
+    return (!!requestFullScreen);
+
+}
+
+function setFullScreen(value: boolean) {
+    let doc: any = window.document;
+    let docEl: any = doc.documentElement;
+
+    var requestFullScreen = docEl.requestFullscreen || docEl.mozRequestFullScreen || docEl.webkitRequestFullScreen || docEl.msRequestFullscreen;
+    var cancelFullScreen = doc.exitFullscreen || doc.mozCancelFullScreen || doc.webkitExitFullscreen || doc.msExitFullscreen;
+
+    if (!doc.fullscreenElement && !doc.mozFullScreenElement && !doc.webkitFullscreenElement && !doc.msFullscreenElement) {
+        requestFullScreen.call(docEl);
+    }
+    else {
+        cancelFullScreen.call(doc);
+    }
+}
+
+type SnapshotEditorState = {
+    zoomedControlInfo: ZoomedControlInfo | undefined;
+    zoomedControlOpen: boolean;
+
+    canFullScreen: boolean;
+    isFullScreen: boolean;
+    isDebug: boolean;
+    collapseLabel: boolean;
+
+    showStatusMonitor: boolean;
+    name: string,
+    color: string
+
+};
+interface SnapshotEditorProps extends WithStyles<typeof appStyles> {
+    onClose: () => void;
+    onOk: (snapshotIndex: number, name: string, color: string, newSnapshots: (Snapshot | null)[]) => void;
+    snapshotIndex: number;
+}
+
+const SnapshotEditor = withStyles(appStyles)(class extends ResizeResponsiveComponent<SnapshotEditorProps, SnapshotEditorState> {
+    // Before the component mounts, we initialise our state
+
+    model_: PiPedalModel;
+
+    getCollapseLabel() {
+        return this.windowSize.width < 500;
+    }
+
+    constructor(props: SnapshotEditorProps) {
+        super(props);
+        this.model_ = PiPedalModelFactory.getInstance();
+
+        this.model_.zoomedUiControl.addOnChangedHandler(
+            () => {
+                this.setState({
+                    zoomedControlOpen: this.model_.zoomedUiControl.get() !== undefined,
+                    zoomedControlInfo: this.model_.zoomedUiControl.get()
+                });
+            }
+        );
+
+        let snapshot = this.model_.pedalboard.get().snapshots[this.props.snapshotIndex] ?? new Snapshot();
+        this.state = {
+            zoomedControlOpen: false,
+            zoomedControlInfo: this.model_.zoomedUiControl.get(),
+            canFullScreen: supportsFullScreen() && !this.model_.isAndroidHosted(),
+            isFullScreen: !!document.fullscreenElement,
+            showStatusMonitor: this.model_.showStatusMonitor.get(),
+            isDebug: true,
+            name: snapshot.name,
+            color: snapshot.color,
+            collapseLabel: this.getCollapseLabel()
+
+        };
+
+        this.showStatusMonitorHandler = this.showStatusMonitorHandler.bind(this);
+    }
+
+    showStatusMonitorHandler() {
+        this.setState({
+            showStatusMonitor: this.model_.showStatusMonitor.get()
+        });
+    }
+    toggleFullScreen(): void {
+        setFullScreen(this.state.isFullScreen);
+        this.setState({ isFullScreen: !this.state.isFullScreen });
+    }
+
+    componentDidMount() {
+
+        super.componentDidMount();
+        this.model_.showStatusMonitor.addOnChangedHandler(this.showStatusMonitorHandler);
+
+    }
+
+
+    updateOverscroll(): void {
+        if (this.model_.serverVersion) {
+            // no pull-down refresh on android devices once we're ready (unless we're debug)
+            let preventOverscroll =
+                this.model_.state.get() === State.Ready
+                && !this.model_.debug;
+
+            let overscrollBehavior = preventOverscroll ? "none" : "auto";
+            document.body.style.overscrollBehavior = overscrollBehavior;
+        }
+    }
+
+    componentDidUpdate() {
+    }
+
+    componentWillUnmount() {
+        super.componentWillUnmount();
+        this.model_.banks.removeOnChangedHandler(this.showStatusMonitorHandler);
+    }
+
+    onWindowSizeChanged(width: number, height: number): void {
+        super.onWindowSizeChanged(width, height);
+        this.setState({
+            collapseLabel: this.getCollapseLabel()
+        });
+
+    }
+
+    handleOk() {
+        let selectedSnapshot = this.props.snapshotIndex;
+        let currentPedalboard = this.model_.pedalboard.get();
+        let newSnapshots = Snapshot.cloneSnapshots(currentPedalboard.snapshots);
+        let newSnapshot = this.model_.pedalboard.get().makeSnapshot();
+        newSnapshot.name = this.state.name;
+        newSnapshot.color = this.state.color;
+        newSnapshots[selectedSnapshot] = newSnapshot;
+        this.model_.setSnapshots(newSnapshots, selectedSnapshot);
+
+        this.props.onOk(selectedSnapshot, this.state.name, this.state.color, newSnapshots);
+
+
+    }
+
+    render() {
+
+        const { classes } = this.props;
+
+        return (
+
+            <div
+                className={classes.shadowCatcher}
+                style={{
+                    position: "absolute", top: 0, left: 0, right: 0, bottom: 0,
+                    colorScheme: isDarkMode() ? "dark" : "light", // affects scrollbar color
+                    minHeight: 345, minWidth: 390,
+                    userSelect: "none",
+                    display: "flex", flexDirection: "column", flexWrap: "nowrap",
+                    overscrollBehavior: this.state.isDebug ? "auto" : "none"
+                }}
+                onContextMenu={(e) => {
+                    if (!this.model_.debug) {
+                        e.preventDefault(); e.stopPropagation();
+                    }
+                }}
+            >
+                <CssBaseline />
+                <AppBar position="static" sx={{ bgcolor: isDarkMode() ? "#100020" : "#200040" }} >
+                    <Toolbar variant="dense"  >
+                        <IconButton
+                            edge="start"
+                            aria-label="menu"
+                            color="inherit"
+                            onClick={() => { this.handleOk(); }}
+                            size="large">
+                            <ArrowBackIcon />
+                        </IconButton>
+                        {!this.state.collapseLabel && (
+                            <Typography style={{ flex: "0 1 auto", opacity: 0.66 }}
+                                variant="body1" noWrap
+                            >
+                                {'Snapshot ' + (this.props.snapshotIndex + 1)}
+                            </Typography>
+                        )}
+
+                        <div style={{ flex: "1 1 auto", display: "flex", flexFlow: "column nowrap", marginRight: 8 }}>
+                            <TextField
+                                sx={{
+                                    input: { color: 'white' },
+                                    '& .MuiInput-underline:before': { borderBottomColor: '#FFFFFFC0' },
+                                    '& .MuiInput-underline:hover:before': { borderBottomColor: '#FFFFFFE0' },
+                                    '& .MuiInput-underline:after': { borderBottomColor: '#FFFFFF' }
+                                }}
+                                variant="standard"
+                                style={{ flex: "1 1 auto", marginLeft: 16, maxWidth: 500, color: "white" }}
+                                value={this.state.name}
+                                onChange={(ev) => {
+                                    this.setState({ name: ev.target.value });
+                                }}
+                            />
+                        </div>
+                        <ColorDropdownButton
+                            currentColor={this.state.color}
+                            onColorChange={(newColor) => {
+                                this.setState({ color: newColor });
+                            }} />
+                        {this.state.canFullScreen &&
+                            <IconButton
+                                aria-label="full-screen"
+                                onClick={() => { this.toggleFullScreen(); }}
+                                color="inherit"
+                                size="medium">
+                                {this.state.isFullScreen ? (
+                                    <FullscreenExitIcon style={{ opacity: 0.75 }} />
+                                ) : (
+                                    <FullscreenIcon style={{ opacity: 0.75 }} />
+
+                                )}
+
+                            </IconButton>
+                        }
+                        <IconButton
+                            aria-label="cancel"
+                            onClick={() => { this.props.onClose(); }}
+                            color="inherit"
+                            size="medium">
+                            <CloseIcon />
+                        </IconButton>
+
+                    </Toolbar>
+                </AppBar>
+                <main className={classes.mainFrame} >
+                    <div style={{
+                        overflow: "hidden",
+                        flex: "1 1 auto"
+                    }} >
+                        <div className={classes.heroContent}>
+                            <MainPage hasTinyToolBar={false} enableStructureEditing={false} />
+                        </div>
+
+                    </div>
+                </main>
+
+                <ZoomedUiControl
+                    dialogOpen={this.state.zoomedControlOpen}
+                    controlInfo={this.state.zoomedControlInfo}
+                    onDialogClose={() => { this.setState({ zoomedControlOpen: false }); }}
+                    onDialogClosed={() => { this.model_.zoomedUiControl.set(undefined); }
+                    }
+                />
+                {this.state.showStatusMonitor && (<JackStatusView />)}
+            </div >
+        );
+    }
+}
+);
+
+export default SnapshotEditor;

react/src/SnapshotPanel.tsx

@@ -0,0 +1,401 @@
+/*
+* MIT License
+* 
+* Copyright (c) 2024 Robin E. R. Davies
+* 
+* Permission is hereby granted, free of charge, to any person obtaining a copy of
+* this software and associated documentation files (the "Software"), to deal in
+* the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+* of the Software, and to permit persons to whom the Software is furnished to do
+* so, subject to the following conditions:
+* 
+* The above copyright notice and this permission notice shall be included in all
+* copies or substantial portions of the Software.
+* 
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+* SOFTWARE.
+*/
+
+import Typography from '@mui/material/Typography';
+import IconButton from '@mui/material/IconButton';
+import ButtonBase from '@mui/material/ButtonBase';
+import { Pedalboard, Snapshot } from './Pedalboard';
+import { PiPedalModel, PiPedalModelFactory } from './PiPedalModel';
+import ResizeResponsiveComponent from './ResizeResponsiveComponent';
+import SaveIconOutline from '@mui/icons-material/Save';
+import Button from "@mui/material/Button";
+import EditIconOutline from '@mui/icons-material/Edit';
+
+import SnapshotPropertiesDialog from './SnapshotPropertiesDialog';
+import { colorKeys, getBackgroundColor, getBorderColor } from './MaterialColors';
+
+
+
+export interface SnapshotPanelProps {
+    panelHeight?: string,
+    onEdit?: (snapshotIndex: number) => boolean
+};
+
+export interface SnapshotPanelState {
+    snapshots: (Snapshot | null)[],
+    portraitOrientation: boolean,
+    collapseButtons: boolean,
+    largeText: boolean,
+
+    snapshotPropertiesDialogOpen: boolean,
+    editTitle: string,
+    editColor: string,
+    editing: boolean,
+    editId: number,
+    selectedSnapshot: number
+
+};
+
+export default class SnapshotPanel extends ResizeResponsiveComponent<SnapshotPanelProps, SnapshotPanelState> {
+    private model: PiPedalModel;
+
+    constructor(props: SnapshotPanelProps) {
+        super(props);
+        this.model = PiPedalModelFactory.getInstance();
+        this.state = {
+            snapshots: this.getCurrentSnapshots(),
+            selectedSnapshot: this.getSelectedSnapshot(),
+            portraitOrientation: this.getPortraitOrientation(),
+            collapseButtons: this.getCollapseButtons(),
+            largeText: this.getLargeText(),
+
+            snapshotPropertiesDialogOpen: false,
+            editTitle: "",
+            editColor: "",
+            editing: false,
+            editId: 0,
+
+        };
+        this.onPedalboardChanged = this.onPedalboardChanged.bind(this);
+        this.onSelectedSnapshotChanged = this.onSelectedSnapshotChanged.bind(this);
+    }
+
+    getCurrentSnapshots() {
+        let result: (Snapshot | null)[] = [];
+        let currentSnapshots = this.model.pedalboard.get().snapshots;
+        for (let i = 0; i < 6; ++i) {
+            let mySnapshot = null;
+            if (i < currentSnapshots.length) {
+                if (currentSnapshots[i] !== null) {
+                    mySnapshot = new Snapshot().deserialize(currentSnapshots[i]); // a deep clone.
+                }
+            }
+            result.push(mySnapshot);
+        }
+        return result;
+    }
+    getSelectedSnapshot() {
+        return this.model.selectedSnapshot.get();
+    }
+
+    onSelectedSnapshotChanged(value: number) {
+        this.setState({ selectedSnapshot: this.getSelectedSnapshot() })
+    }
+    onPedalboardChanged(value: Pedalboard) {
+        // boofs our current edit, oh well. we can't track property across a structural change.
+        this.setState({
+            snapshots: this.getCurrentSnapshots(),
+            selectedSnapshot: this.getSelectedSnapshot()
+        });
+    }
+    componentDidMount(): void {
+        super.componentDidMount();
+        this.model.pedalboard.addOnChangedHandler(this.onPedalboardChanged);
+        this.model.selectedSnapshot.addOnChangedHandler(this.onSelectedSnapshotChanged);
+        this.setState({
+            snapshots: this.getCurrentSnapshots(),
+            selectedSnapshot: this.getSelectedSnapshot()
+        });
+    }
+
+    componentWillUnmount(): void {
+        super.componentWillUnmount();
+        this.model.selectedSnapshot.removeOnChangedHandler(this.onSelectedSnapshotChanged);
+        this.model.pedalboard.removeOnChangedHandler(this.onPedalboardChanged)
+
+    }
+
+    getCollapseButtons() {
+        if (this.getPortraitOrientation())
+        {
+            return window.innerWidth < 550;
+        } else {
+            return window.innerWidth < 800;
+        }
+        return window.innerWidth < 500;
+    }
+    getPortraitOrientation() {
+        return window.innerWidth * 2 < window.innerHeight * 3;
+    }
+
+    getLargeText() {
+        return window.innerHeight > 700 && window.innerWidth > 1000;
+    }
+    onSaveSnapshot(index: number) {
+        let snapshot = this.state.snapshots[index];
+        if (snapshot) {
+            // no dialog required. just save it.
+            this.handleSnapshotPropertyOk(
+                index,
+                snapshot.name,
+                snapshot.color,
+                false);
+        } else {
+            this.setState({
+                editTitle: "",
+                editColor: "",
+                editId: index,
+                snapshotPropertiesDialogOpen: true,
+                editing: false
+            });
+
+        }
+
+    }
+    onEditSnapshot(index: number) {
+        if (this.props.onEdit) {
+            if (this.props.onEdit(index)) {
+                return;
+            }
+        }
+        let snapshot = this.state.snapshots[index];
+        if (snapshot) {
+            this.setState({
+                editTitle: snapshot.name,
+                editColor: snapshot.color,
+                editId: index,
+                snapshotPropertiesDialogOpen: true,
+                editing: true
+            });
+        }
+    }
+    onWindowSizeChanged(width: number, height: number): void {
+        this.setState(
+            {
+                portraitOrientation: this.getPortraitOrientation(),
+                collapseButtons: this.getCollapseButtons(),
+                largeText: this.getLargeText()
+            }
+        );
+    }
+
+    selectSnapshot(index: number) {
+        this.model.selectSnapshot(index);
+    }
+    renderSnapshot(snapshot: Snapshot | null, index: number) {
+        //let state = this.state;
+        let color: string;
+        let bordercolor: string;
+        if (snapshot) {
+            if (colorKeys.indexOf(snapshot.color) === -1) {
+                bordercolor = color = snapshot.color;
+            } else {
+                color = getBackgroundColor(snapshot.color);
+                bordercolor = getBorderColor(snapshot.color);
+            }
+        } else {
+            bordercolor = color = getBackgroundColor("grey");
+        }
+        let title = snapshot ? snapshot.name : "<unassigned>";
+        let disabled = snapshot === null;
+        let selected = this.state.selectedSnapshot === index;
+        return (
+            <div style={{ display: "flex", position: "relative",flexGrow: 1, flexBasis: 1, flexFlow: "column nowrap", alignItems: "stretch", borderRadius: 16 }}>
+
+                <ButtonBase style={{
+                    display: "flex", flexGrow: 1, flexBasis: 1, flexFlow: "column nowrap", alignItems: "stretch", borderRadius: 16,
+                    background: color,
+                    boxShadow: "1px 3px 6px #00000090"
+                }}
+                    onMouseDown={(ev) => {
+                        if (!selected) ev.stopPropagation();
+                    }}
+
+                    onClick={() => { if (snapshot) this.selectSnapshot(index); }}
+                >
+                    <div
+                        style={{ flexGrow: 1, flexShrink: 1, display: "flex", flexFlow: "column nowrap", alignItems: "stretch" }}
+                        onMouseDown={(ev) => {
+                            if (disabled) ev.stopPropagation();
+                        }}
+                    >
+                        <div style={{
+                            flexGrow: 1, flexShrink: 1, display: "flex", flexFlow: "column nowrap", alignItems: "stretch", justifyContent: "center", margin: 6,
+                            borderColor: selected ? bordercolor : "transparent", borderStyle: "solid", borderWidth: 3, borderRadius: 10
+                        }}
+                        >
+                            <div style={{ flexGrow: 1, display: "flex", alignItems: "center", justifyContent: "center" }}>
+
+                                <Typography display="block" color="textPrimary" align="center" variant="body1"
+                                    style={{ fontSize: this.state.largeText ? "30px" : undefined }}
+                                >{title}</Typography>
+                            </div>
+                            <div style={{ height: 54,flexGrow: 0,flexShrink: 0 }}>
+                                {/* placeholder where we will float the buttons, which can't be witin another button (tons of DOM validation warning messages in chrome) */}
+                            </div>
+
+                        </div>
+                    </div>
+                </ButtonBase >
+                <div style={{ flexGrow: 0, position: "absolute", bottom:0,left:0,right:0,paddingBottom:10,paddingLeft: 16, paddingRight:12 }} >
+                    <Typography variant="h3" style={{opacity: 0.15,fontSize: "44px",fontWeight:900,fontFamily: "Arial Black",fontStyle: "italic"}} >{(index+1).toString()}</Typography>
+                </div>
+
+                <div style={{ flexGrow: 0, position: "absolute", bottom:0,left:0,right:0,paddingBottom:12,paddingLeft: 12, paddingRight:12 }} >
+                        {!this.state.collapseButtons ? (
+                            <div style={{ marginRight: 8, display: "flex", flexFlow: "row nowrap" }}>
+                                <div style={{ flexGrow: 1, flexBasis: 1 }} >&nbsp;</div>
+                                <Button variant="dialogSecondary" startIcon={<SaveIconOutline />} color="inherit" style={{ textTransform: "none" }}
+                                    onMouseDown={(ev) => { ev.stopPropagation(); /*don't prop to card*/ }}
+                                    onMouseUp={(ev) => { ev.stopPropagation(); /*don't prop to card*/ }}
+                                    disabled={false}
+                                    onClick={(ev) => { ev.stopPropagation(); this.onSaveSnapshot(index); }}
+
+                                >
+                                    Save
+                                </Button>
+                                <Button variant="dialogSecondary" color="inherit" startIcon={<EditIconOutline />} style={{ textTransform: "none" }}
+                                    onMouseDown={(ev) => { ev.stopPropagation();  /*don't prop to card*/ }}
+                                    onMouseUp={(ev) => { ev.stopPropagation(); /*don't prop to card*/ }}
+                                    disabled={disabled}
+                                    onClick={(ev) => { ev.stopPropagation(); this.onEditSnapshot(index); }}
+
+                                >
+                                    Edit
+                                </Button>
+                            </div>
+
+                        ) : (
+                            <div style={{ marginLeft: "auto", marginRight: 8, display: "flex", flexFlow: "row nowrap" }}>
+                                <div style={{ flexGrow: 1, flexBasis: 1 }} >&nbsp;</div>
+                                <IconButton color="inherit" style={{ opacity: 0.66 }} disabled={false}
+                                    onMouseDown={(ev) => { ev.stopPropagation(); /*don't prop to card*/ }}
+                                    onClick={() => { this.onSaveSnapshot(index); }}
+                                >
+                                    <SaveIconOutline />
+                                </IconButton>
+                                <IconButton color="inherit" disabled={disabled} style={{ opacity: 0.66 }}
+                                    onMouseDown={(ev) => { ev.stopPropagation();  /*don't prop to card*/ }}
+                                    onClick={() => { this.onEditSnapshot(index); }}
+
+                                >
+                                    <EditIconOutline />
+                                </IconButton>
+                            </div>
+
+                        )}
+
+                    </div>
+            </div >
+        );
+    }
+
+
+
+
+    handleSnapshotPropertyOk(index: number, name: string, color: string, editing: boolean) {
+        if (editing) {
+            let snapshots = Snapshot.cloneSnapshots(this.state.snapshots);
+            let snapshot = snapshots[index];
+            if (snapshot) {
+                snapshot.name = name;
+                snapshot.color = color;
+            }
+            this.setState({
+                snapshots: snapshots,
+                snapshotPropertiesDialogOpen: false
+            });
+            this.model.setSnapshots(snapshots, -1);
+
+        } else {
+            let pedalboard = this.model.pedalboard.get();
+            let newSnapshot = pedalboard.makeSnapshot();
+            newSnapshot.name = name;
+            newSnapshot.color = color;
+            let snapshots = Snapshot.cloneSnapshots(this.state.snapshots);
+            snapshots[index] = newSnapshot;
+            this.setState({
+                snapshots: snapshots,
+                snapshotPropertiesDialogOpen: false
+            });
+            this.model.setSnapshots(snapshots, index);
+
+
+
+        }
+    }
+
+    bg: undefined;
+
+    render() {
+        let snapshots = this.state.snapshots;
+        return (
+            <div style={{
+                flex: "1 1 auto",
+                height: this.props.panelHeight,
+                overflow: "hidden", margin: 0,
+                paddingLeft: 16, paddingRight: 16, paddingTop: 0, paddingBottom: 24,
+                background: this.bg,
+                display: "flex", flexFlow: "column nowrap", alignContent: "stretch", justifyContent: "stretch"
+            }}>
+
+                <div style={{
+                    flexGrow: 1, flexShrink: 1, flexBasis: 1,
+
+                    display: "flex",
+                    flexFlow: this.state.portraitOrientation ?
+                        "row nowrap" : "column nowrap",
+                    alignItems: "stretch", gap: 8
+                }}>
+                    <div style={{
+                        flexGrow: 1, flexShrink: 1, flexBasis: 1,
+                        display: "flex",
+                        flexFlow: this.state.portraitOrientation ?
+                            "column nowrap"
+                            : "row nowrap",
+                        alignItems: "stretch", gap: 8
+                    }}>
+                        {this.renderSnapshot(snapshots[0], 0)}
+                        {this.renderSnapshot(snapshots[1], 1)}
+                        {this.renderSnapshot(snapshots[2], 2)}
+                    </div>
+                    <div style={{
+                        flexGrow: 1, flexShrink: 1, flexBasis: 1,
+                        display: "flex",
+                        flexFlow: this.state.portraitOrientation ? "column nowrap" : "row nowrap", alignItems: "stretch", gap: 8
+                    }}>
+                        {this.renderSnapshot(snapshots[3], 3)}
+                        {this.renderSnapshot(snapshots[4], 4)}
+                        {this.renderSnapshot(snapshots[5], 5)}
+                    </div>
+                </div>
+                {
+                    this.state.snapshotPropertiesDialogOpen && (
+                        <SnapshotPropertiesDialog
+                            open={this.state.snapshotPropertiesDialogOpen}
+                            name={this.state.editTitle}
+                            color={this.state.editColor}
+                            editing={this.state.editing}
+                            snapshotIndex={this.state.editId}
+                            onClose={() => { this.setState({ snapshotPropertiesDialogOpen: false }); }}
+                            onOk={(snapshotId, name, color, editing) => {
+                                this.handleSnapshotPropertyOk(snapshotId, name, color, editing);
+                            }}
+                        />
+                    )
+                }
+            </div>
+        );
+    }
+}

react/src/SnapshotPropertiesDialog.tsx

@@ -0,0 +1,193 @@
+/*
+ * MIT License
+ * 
+ * Copyright (c) 2024 Robin E. R. Davies
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import React from 'react';
+import Button from '@mui/material/Button';
+import TextField from '@mui/material/TextField';
+import ButtonBase from "@mui/material/ButtonBase"
+import Typography from '@mui/material/Typography';
+import DialogEx from './DialogEx';
+import DialogTitle from '@mui/material/DialogTitle';
+import ArrowBackIcon from '@mui/icons-material/ArrowBack';
+import IconButton from '@mui/material/IconButton';
+import DialogActions from '@mui/material/DialogActions';
+import DialogContent from '@mui/material/DialogContent';
+import { colorKeys, getBackgroundColor } from "./MaterialColors";
+import ResizeResponsiveComponent from './ResizeResponsiveComponent';
+
+const snapshotColors = colorKeys.slice(0,100);
+const NBSP = "\u00A0";
+
+export interface SnapshotPropertiesDialogProps {
+    open: boolean,
+    name: string,
+    editing: boolean,
+    snapshotIndex: number,
+    color: string,
+    onOk: (snapshotId: number, name: string, color: string, editing: boolean) => void,
+    onClose: () => void
+};
+
+export interface SnapshotPropertiesDialogState {
+    name: string,
+    color: string,
+    nameErrorMessage: string,
+    compactVertical: boolean,
+};
+
+export default class SnapshotPropertiesDialog extends ResizeResponsiveComponent<SnapshotPropertiesDialogProps, SnapshotPropertiesDialogState> {
+
+
+    constructor(props: SnapshotPropertiesDialogProps) {
+        super(props);
+        this.state = this.stateFromProps();
+    }
+    getCompactVertical() {
+        return window.innerHeight < 450;
+    }
+    stateFromProps() {
+        let color = this.props.color;
+        if (color.length === 0) {
+            color = snapshotColors[0];
+        }
+        let name = this.props.name;
+        if (name.length === 0 && !this.props.editing)
+        {
+            name = "Snapshot " + (this.props.snapshotIndex+1);
+        }
+        return {
+            name: name,
+            color: color,
+            nameErrorMessage: "",
+            compactVertical: this.getCompactVertical()
+        };
+    }
+
+    onWindowSizeChanged(width: number, height: number): void {
+        super.onWindowSizeChanged(width,height);
+        this.setState({compactVertical: this.getCompactVertical() })
+    }
+
+    handleOk() {
+        if (this.state.name === "") {
+            this.setState({ nameErrorMessage: "* Required" });
+        } else {
+            this.props.onOk(
+                this.props.snapshotIndex,
+                this.state.name,
+                this.state.color,
+                this.props.editing
+            );
+        }
+    }
+
+    render() {
+        let props = this.props;
+
+        const handleClose = () => {
+            props.onClose();
+        };
+
+        let okButtonText = this.props.editing ? "OK" : "Save";
+        return (
+            <DialogEx maxWidth={false} tag="snapshotProps" open={this.props.open} onClose={handleClose} 
+                style={{ userSelect: "none" }} fullScreen={this.state.compactVertical}
+            >
+                <DialogTitle>
+                    <div>
+                        <IconButton edge="start" color="inherit" onClick={() => { this.props.onClose(); }} aria-label="back"
+                        >
+                            <ArrowBackIcon fontSize="small" style={{ opacity: "0.6" }} />
+                        </IconButton>
+                        <Typography display="inline" variant="body1" color="textSecondary" >
+                            {this.props.editing ? "Edit snapshot" : "Save snapshot"}
+                        </Typography>
+                    </div>
+
+                </DialogTitle>
+                <DialogContent>
+
+                    <TextField variant="standard" style={{ flexGrow: 1, flexBasis: 1 }}
+                        autoComplete="off"
+                        spellCheck="false"
+                        error={this.state.nameErrorMessage.length !== 0}
+                        id="name"
+                        label="Name"
+                        type="text"
+                        fullWidth
+                        helperText={this.state.nameErrorMessage.length === 0 ? NBSP : this.state.nameErrorMessage}
+                        value={this.state.name}
+                        onChange={(e) => this.setState({ name: e.target.value, nameErrorMessage: "" })}
+                        InputLabelProps={{
+                            shrink: true
+                        }}
+                    />
+                    <Typography variant="caption" color="textSecondary">Color</Typography>
+                    <div style={{ margin: 4,display: "flex", flexFlow: "row wrap", gap: 8 }}>
+                        {
+                            snapshotColors.map((colorKey, index) => {
+                                let selected = this.state.color === colorKey;
+                                let color = getBackgroundColor(colorKey);
+                                return (
+                                    <ButtonBase
+                                        key={"colorTag" + index}
+                                        style={{
+                                            width: 48, height: 48,
+                                            borderRadius: 8,
+                                            borderStyle: "solid",
+                                            borderColor: selected ? color : "transparent",
+                                            borderWidth: 2,
+                                        }}
+                                        onClick={()=> { 
+                                            this.setState({color: colorKey});
+                                        }}
+
+                                    >
+                                    <div style={{
+                                        width: 40, height: 40,
+                                        borderRadius: 4,
+                                        margin: 2,
+                                        background: color
+                                    }}>
+                                    </div>
+
+                                    </ButtonBase>
+
+                                );
+                            })
+                        }
+                    </div>
+                </DialogContent>
+                <DialogActions>
+                    <Button variant="dialogSecondary" onClick={handleClose} >
+                        Cancel
+                    </Button>
+                    <Button variant="dialogPrimary" onClick={()=> {this.handleOk();}}  >
+                        {okButtonText}
+                    </Button>
+                </DialogActions>
+            </DialogEx>
+        );
+    }
+}

react/src/svg/snapshot_0.svg

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="24"
+   height="24"
+   viewBox="0 -960 960 960"
+   id="svg2989"
+   >
+  <defs
+     id="defs2995" />
+  <path
+     d="m 480,-260 q 75,0 127.5,-52.5 Q 660,-365 660,-440 660,-515 607.5,-567.5 555,-620 480,-620 405,-620 352.5,-567.5 300,-515 300,-440 q 0,75 52.5,127.5 Q 405,-260 480,-260 z m 0,-80 q -42,0 -71,-29 -29,-29 -29,-71 0,-42 29,-71 29,-29 71,-29 42,0 71,29 29,29 29,71 0,42 -29,71 -29,29 -71,29 z m -320,220 q -33,0 -56.5,-23.5 Q 80,-167 80,-200 v -480 q 0,-33 23.5,-56.5 Q 127,-760 160,-760 h 126 l 74,-80 h 240 l 74,80 h 126 q 33,0 56.5,23.5 23.5,23.5 23.5,56.5 v 480 q 0,33 -23.5,56.5 Q 833,-120 800,-120 H 160 z m 0,-80 H 800 V -680 H 638 l -73,-80 H 395 l -73,80 H 160 v 480 z m 320,-240 z"
+     id="path2991" />
+</svg>

react/src/svg/snapshot_1.svg

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="24"
+   height="24"
+   viewBox="0 -960 960 960"
+   id="svg2989"
+   >
+  <path
+     d="m 160,-120 c -22,0 -40.83333,-7.83333 -56.5,-23.5 C 87.833333,-159.16667 80,-178 80,-200 l 0,-480 c 0,-22 7.833333,-40.83333 23.5,-56.5 15.66667,-15.66667 34.5,-23.5 56.5,-23.5 l 126,0 74,-80 240,0 74,80 126,0 c 22,0 40.83333,7.83333 56.5,23.5 15.66667,15.66667 23.5,34.5 23.5,56.5 l 0,480 c 0,22 -7.83333,40.83333 -23.5,56.5 -15.66667,15.66667 -34.5,23.5 -56.5,23.5 z m 0,-80 640,0 0,-480 -162,0 -73,-80 -170,0 -73,80 -162,0 z"
+     id="path2991" />
+   <path
+      d="m 466.24994,-624.73151 74.61914,0 0,335.91797 -89.82422,0 0,-238.53515 -56.95312,41.36718 -42.31934,-62.44629 z"
+      id="path3772"
+      />
+</svg>

react/src/svg/snapshot_2.svg

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="24"
+   height="24"
+   viewBox="0 -960 960 960"
+   id="svg2989"
+   >
+  <path
+     d="m 160,-120 c -22,0 -40.83333,-7.83333 -56.5,-23.5 C 87.833333,-159.16667 80,-178 80,-200 l 0,-480 c 0,-22 7.833333,-40.83333 23.5,-56.5 15.66667,-15.66667 34.5,-23.5 56.5,-23.5 l 126,0 74,-80 240,0 74,80 126,0 c 22,0 40.83333,7.83333 56.5,23.5 15.66667,15.66667 23.5,34.5 23.5,56.5 l 0,480 c 0,22 -7.83333,40.83333 -23.5,56.5 -15.66667,15.66667 -34.5,23.5 -56.5,23.5 z m 0,-80 640,0 0,-480 -162,0 -73,-80 -170,0 -73,80 -162,0 z"
+     id="path2991" />
+   <path
+      d="m 464.58002,-359.31647 130.06347,0 0,70.50293 -243.77929,0 0,-69.71191 c 52.40226,-42.73426 89.24793,-76.47202 110.53711,-101.21338 21.2889,-24.74102 31.93342,-45.08523 31.93359,-61.03272 -1.7e-4,-11.65991 -3.7697,-20.95677 -11.30859,-27.89062 -7.53922,-6.93333 -17.67593,-10.40012 -30.41016,-10.40039 -11.68957,2.7e-4 -24.34337,1.91189 -37.96143,5.73486 -13.61824,3.82351 -30.86676,9.8025 -51.7456,17.93701 l -2.54883,-75.04394 c 20.30268,-7.66569 39.73137,-13.22965 58.28613,-16.6919 18.55458,-3.46157 37.07507,-5.19252 55.56153,-5.19287 34.45294,3.5e-4 62.57791,9.49252 84.375,28.47657 21.79661,18.98467 32.69504,43.37917 32.69531,73.18359 -2.7e-4,25.61545 -10.25905,52.81513 -30.77637,81.59912 -20.51779,28.78431 -52.15839,58.69883 -94.92187,89.74365 z"
+      id="path3775"
+      />
+</svg>

react/src/svg/snapshot_3.svg

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="24"
+   height="24"
+   viewBox="0 -960 960 960"
+   id="svg2989"
+   >
+  <path
+     d="m 160,-120 c -22,0 -40.83333,-7.83333 -56.5,-23.5 C 87.833333,-159.16667 80,-178 80,-200 l 0,-480 c 0,-22 7.833333,-40.83333 23.5,-56.5 15.66667,-15.66667 34.5,-23.5 56.5,-23.5 l 126,0 74,-80 240,0 74,80 126,0 c 22,0 40.83333,7.83333 56.5,23.5 15.66667,15.66667 23.5,34.5 23.5,56.5 l 0,480 c 0,22 -7.83333,40.83333 -23.5,56.5 -15.66667,15.66667 -34.5,23.5 -56.5,23.5 z m 0,-80 640,0 0,-480 -162,0 -73,-80 -170,0 -73,80 -162,0 z"
+     id="path2991" />
+   <path
+      d="m 525.94232,-463.5401 c 20.01931,2.99822 35.90064,11.34538 47.64404,25.0415 11.74291,13.69643 17.61448,30.62268 17.61475,50.77881 -2.7e-4,31.46491 -13.95533,56.27446 -41.86523,74.42871 -27.91036,18.15431 -65.69352,27.23145 -113.34961,27.23145 -14.88291,0 -29.52157,-0.92285 -43.91602,-2.76856 -14.39458,-1.8457 -30.20023,-5.083 -47.41699,-9.71191 l 5.33203,-75.9375 c 16.123,6.02547 30.38813,10.44197 42.79541,13.24951 12.40714,2.80769 25.42715,4.2115 39.06006,4.21143 20.41003,7e-5 36.10581,-3.4179 47.0874,-10.25391 10.98128,-6.83585 16.472,-15.95205 16.47217,-27.34863 -1.7e-4,-10.37098 -4.06023,-18.31042 -12.18018,-23.81836 -8.12027,-5.50768 -20.41762,-8.26158 -36.89209,-8.26172 l -45.60058,0 0,-66.81152 42.37793,0 c 15.26353,2e-4 27.3729,-2.98564 36.32812,-8.95752 8.95492,-5.97146 13.43245,-13.52761 13.43262,-22.66846 -1.7e-4,-9.69702 -4.57048,-17.58275 -13.71094,-23.65723 -9.14077,-6.07395 -21.76771,-9.11106 -37.88086,-9.11132 -12.22667,2.6e-4 -24.54843,1.18435 -36.96533,3.55224 -12.41706,2.36843 -27.25835,6.00856 -44.52392,10.92041 l -4.33594,-68.67187 c 18.74018,-5.57585 36.48919,-9.57242 53.24707,-11.98975 16.75771,-2.41665 33.81824,-3.62515 51.18164,-3.62549 39.17951,3.4e-4 69.86551,8.23031 92.0581,24.68994 22.19214,16.46026 33.28832,39.28495 33.28858,68.47412 -2.6e-4,18.86742 -5.34694,34.70725 -16.04004,47.51954 -10.6936,12.81268 -25.10764,20.6447 -43.24219,23.49609 z"
+      id="path3778"
+      />
+</svg>

react/src/svg/snapshot_4.svg

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="24"
+   height="24"
+   viewBox="0 -960 960 960"
+   id="svg2989"
+   >
+  <path
+     d="m 160,-120 c -22,0 -40.83333,-7.83333 -56.5,-23.5 C 87.833333,-159.16667 80,-178 80,-200 l 0,-480 c 0,-22 7.833333,-40.83333 23.5,-56.5 15.66667,-15.66667 34.5,-23.5 56.5,-23.5 l 126,0 74,-80 240,0 74,80 126,0 c 22,0 40.83333,7.83333 56.5,23.5 15.66667,15.66667 23.5,34.5 23.5,56.5 l 0,480 c 0,22 -7.83333,40.83333 -23.5,56.5 -15.66667,15.66667 -34.5,23.5 -56.5,23.5 z m 0,-80 640,0 0,-480 -162,0 -73,-80 -170,0 -73,80 -162,0 z"
+     id="path2991" />
+   <path
+      d="m 485.98138,-553.77448 -81.15234,133.79883 76.93359,0 z m -19.13086,-70.95703 104.58985,0 0,204.75586 44.34082,0 0,68.20313 -44.34082,0 0,62.95898 -89.82422,0 0,-62.95898 -146.38184,0 0,-78.22266 z"
+      id="path3781" />
+</svg>

react/src/svg/snapshot_5.svg

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="24"
+   height="24"
+   viewBox="0 -960 960 960"
+   id="svg2989"
+   >
+  <path
+     d="m 160,-120 c -22,0 -40.83333,-7.83333 -56.5,-23.5 C 87.833333,-159.16667 80,-178 80,-200 l 0,-480 c 0,-22 7.833333,-40.83333 23.5,-56.5 15.66667,-15.66667 34.5,-23.5 56.5,-23.5 l 126,0 74,-80 240,0 74,80 126,0 c 22,0 40.83333,7.83333 56.5,23.5 15.66667,15.66667 23.5,34.5 23.5,56.5 l 0,480 c 0,22 -7.83333,40.83333 -23.5,56.5 -15.66667,15.66667 -34.5,23.5 -56.5,23.5 z m 0,-80 640,0 0,-480 -162,0 -73,-80 -170,0 -73,80 -162,0 z"
+     id="path2991" />
+   <path
+      d="m 363.08099,-624.73151 221.22071,0 0,67.74903 -135.30762,0 -1.18652,45.54199 c 2.29479,-0.68337 6.31822,-1.23757 12.07031,-1.6626 5.75181,-0.42458 10.65415,-0.63698 14.70703,-0.63721 37.49004,2.3e-4 67.33132,9.93186 89.52393,29.79493 22.19211,19.86345 33.2883,46.49917 33.28857,79.90722 -2.7e-4,35.85946 -13.09108,64.48736 -39.27246,85.88379 -26.18185,21.39649 -61.22576,32.09473 -105.13184,32.09473 -17.79308,0 -34.15048,-1.04248 -49.07226,-3.12744 -14.92194,-2.08496 -30.3858,-5.71045 -46.3916,-10.87647 l 0,-77.63672 c 17.0019,6.62118 31.97747,11.49422 44.92675,14.61914 12.94913,3.12508 26.03994,4.68757 39.27246,4.6875 18.59362,7e-5 33.33725,-3.98918 44.23096,-11.96777 10.89338,-7.97843 16.34015,-18.28115 16.34033,-30.9082 -1.8e-4,-14.66784 -5.84001,-26.09606 -17.51953,-34.28467 -11.67984,-8.18832 -28.5597,-12.28256 -50.63965,-12.28272 -9.88291,1.6e-4 -20.32235,0.67887 -31.31836,2.03614 -10.99616,1.35758 -24.86821,3.51578 -41.61621,6.47461 z"
+      id="path3784"/>
+</svg>

react/src/svg/snapshot_6.svg

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="24"
+   height="24"
+   viewBox="0 -960 960 960"
+   id="svg2989"
+   >
+  <path
+     d="m 160,-120 c -22,0 -40.83333,-7.83333 -56.5,-23.5 C 87.833333,-159.16667 80,-178 80,-200 l 0,-480 c 0,-22 7.833333,-40.83333 23.5,-56.5 15.66667,-15.66667 34.5,-23.5 56.5,-23.5 l 126,0 74,-80 240,0 74,80 126,0 c 22,0 40.83333,7.83333 56.5,23.5 15.66667,15.66667 23.5,34.5 23.5,56.5 l 0,480 c 0,22 -7.83333,40.83333 -23.5,56.5 -15.66667,15.66667 -34.5,23.5 -56.5,23.5 z m 0,-80 640,0 0,-480 -162,0 -73,-80 -170,0 -73,80 -162,0 z"
+     id="path2991" />
+  <path
+     d="m 478.26166,-438.41803 c -9.97085,1.5e-4 -18.49623,4.18716 -25.57617,12.56104 -7.08021,8.37415 -10.62024,19.2506 -10.62012,32.62939 -1.2e-4,13.74032 3.31531,24.70467 9.94629,32.89307 6.63072,8.18854 15.07798,12.28277 25.34179,12.28271 11.14242,6e-5 19.88508,-3.84759 26.22803,-11.54297 6.34259,-7.69523 9.51397,-18.75479 9.51416,-33.17871 -1.9e-4,-13.94519 -3.26923,-25.03893 -9.80713,-33.28125 -6.53826,-8.24204 -14.88053,-12.36313 -25.02685,-12.36328 z m 110.18554,-176.64551 -7.52929,72.09961 c -14.57056,-6.2595 -27.30492,-10.88841 -38.20313,-13.88672 -10.89864,-2.99777 -21.96309,-4.49679 -33.19336,-4.49707 -23.86735,2.8e-4 -41.80434,7.36355 -53.81103,22.08985 -12.00696,14.72679 -18.0885,35.71798 -18.24463,62.97363 2.90027,-10.0584 10.48816,-17.93437 22.76367,-23.62793 12.27524,-5.69314 26.02523,-8.53982 41.25,-8.54004 30.15604,2.2e-4 54.94606,10.35666 74.37012,31.06934 19.42355,20.71305 29.13546,47.00209 29.13574,78.86718 -2.8e-4,34.4532 -11.29666,62.6148 -33.88916,84.48487 -22.593,21.87012 -51.7751,32.80517 -87.54639,32.80517 -43.32043,0 -76.57235,-14.64843 -99.75586,-43.94531 -23.18363,-29.29681 -34.77541,-70.67372 -34.77539,-124.13086 -2e-5,-58.50564 13.35201,-103.32737 40.05616,-134.46533 26.704,-31.13737 65.54918,-46.7062 116.53564,-46.70654 12.91973,3.4e-4 26.01786,1.19174 39.29443,3.57421 13.27614,2.38315 27.79028,6.32846 43.54248,11.83594 z"
+     id="path3886"
+     />
+</svg>

src/AlsaDriver.cpp

@@ -953,9 +953,12 @@ namespace pipedal
             {
                 OpenMidi(jackServerSettings, channelSelection);
                 OpenAudio(jackServerSettings, channelSelection);
+                std::atomic_thread_fence(std::memory_order::release);
             }
             catch (const std::exception &e)
             {
+                std::atomic_thread_fence(std::memory_order::release);
+
                 Close();
                 throw;
             }
@@ -1359,7 +1362,7 @@ namespace pipedal
         long WriteBuffer(snd_pcm_t *handle, uint8_t *buf, size_t frames)
         {
             long framesRead;
-            auto frame_bytes = this->captureFrameSize;
+            auto frame_bytes = this->playbackFrameSize;
 
             while (frames > 0)
             {
@@ -1969,6 +1972,8 @@ namespace pipedal
         }
         virtual void Close()
         {
+            std::atomic_thread_fence(std::memory_order::acquire);
+
             if (!open)
             {
                 return;
@@ -1977,6 +1982,7 @@ namespace pipedal
             Deactivate();
             AlsaCleanup();
             DeleteBuffers();
+            std::atomic_thread_fence(std::memory_order::release);
         }
 
         virtual float CpuUse()

src/AtomConverter.cpp

@@ -1,7 +1,7 @@
 /*
  * MIT License
  *
- * Copyright (c) 2023 Robin E. R. Davies
+ * Copyright (c) 2023-2024 Robin E. R. Davies
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
@@ -29,6 +29,7 @@
 #include "json.hpp"
 #include "ss.hpp"
 #include "lv2/atom/util.h"
+#include "ss.hpp"
 
 using namespace pipedal;
 
@@ -69,6 +70,76 @@ json_variant AtomConverter::ToJson(const LV2_Atom *atom)
     json_variant variant = ToVariant(const_cast<LV2_Atom*>(atom));
     return std::move(variant);
 }
+
+LV2_Atom*AtomConverter::ToAtom(const std::string&jsonString)
+{
+    json_variant jvValue;
+    std::istringstream ss(jsonString);
+    json_reader reader(ss);
+    reader.read(&jvValue);
+    return ToAtom(jvValue);
+}
+
+std::string AtomConverter::ToString(const LV2_Atom*atom)
+{
+    json_variant v = ToJson(atom);
+    std::ostringstream ss;
+    json_writer writer(ss);
+    writer.write(v);
+    return ss.str();
+}
+json_variant AtomConverter::MapPath(const json_variant&json, const std::string &pluginStoragePath)
+{
+    std::string oType = json[OTYPE_TAG].as_string();
+    if (oType == SHORT_ATOM__Path)
+    {
+        std::string path = json["value"].as_string().c_str();
+        if (path.length() == 0 || path[0] == '/')
+        {
+            return json;
+        }
+        std::string newPath = SS(pluginStoragePath << "/" << path);
+        json_variant result = json_variant::make_object();
+        result[OTYPE_TAG] = json_variant(SHORT_ATOM__Path);
+        result["value"] = newPath;
+
+        return result;
+    }
+    else {
+        return json;
+    }
+}
+json_variant AtomConverter::AbstractPath(const json_variant&json, const std::string &pluginStoragePath)
+{
+    std::string oType = json[OTYPE_TAG].as_string();
+    if (oType == SHORT_ATOM__Path)
+    {
+        std::string path = json["value"].as_string().c_str();
+        if (path.length() == 0)
+        {
+            return json;
+        }
+        if (path.starts_with(pluginStoragePath))
+        {
+            auto pos = pluginStoragePath.length();
+            if (pos < path.length() && path[pos] == '/')
+            {
+                ++pos;
+            }
+            path = path.substr(pos);
+        }
+        json_variant result = json_variant::make_object();
+        result[OTYPE_TAG] = json_variant(SHORT_ATOM__Path);
+        result["value"] = path;
+        return result;
+    }
+    else {
+        return json;
+    }
+
+}
+
+
 LV2_Atom*AtomConverter::ToAtom(const json_variant&json)
 {
     if (outputBuffer.size() == 0)
@@ -517,6 +588,29 @@ std::string AtomConverter::TypeUridToString(LV2_URID urid)
     return map.UridToString(urid);
 }
 
+static bool gEmptyPathInitialized = false;
+static std::mutex gInitMutex;
+std::string gEmptyPathstring;
+
+std::string AtomConverter::EmptyPathstring()
+{
+    std::lock_guard lock{gInitMutex};
+
+    if (!gEmptyPathInitialized)
+    {
+        json_variant v = TypedProperty(SHORT_ATOM__Path,std::string("",0));
+        std::ostringstream ss;
+        json_writer writer(ss);
+        writer.write(v);
+
+        gEmptyPathstring = ss.str();
+
+    }
+    return gEmptyPathstring;
+
+}
+
+
 void AtomConverter::InitUrids()
 {
 #define ATOM_INIT(name,shortName) urids.name = InitUrid(LV2_##name,#shortName)

src/AtomConverter.hpp

@@ -31,6 +31,7 @@
 #include "lv2/atom/forge.h"
 #include "json_variant.hpp"
 #include "atom_object.hpp"
+#include "json_variant.hpp"
 
 namespace pipedal
 {
@@ -139,11 +140,25 @@ namespace pipedal
 
         /// @brief Convert a json variant to an atom.
         /// @param json Json variant that matches the structure of the prototype.
-        /// @return An atom.
+        /// @return An atom. Not valid beyond the lifetime of the AtomConverter. Memory is owned by the AtomConverter.
-        /// @remarks
-        /// The json variant must match the structure of the LV2_Atom prototype supplied to 
-        /// the constructor. 
         LV2_Atom*ToAtom(const json_variant& json);
+
+
+        /// @brief Convert a json string to an atom.
+        /// @param json Json string that matches the structure of the prototype.
+        /// @return An atom. Not valid beyond the lifetime of the AtomConverter. Memory is owned by the AtomConverter.
+        /// @remarks
+
+        LV2_Atom*ToAtom(const std::string &jsonString);
+
+        std::string ToString(const LV2_Atom*atom);
+
+        json_variant MapPath(const json_variant&json, const std::string &pluginStoragePath);
+        json_variant AbstractPath(const json_variant&json, const std::string &pluginStoragePath);
+
+
+        static std::string EmptyPathstring();
+
     private:
         static const std::string OTYPE_TAG;
         static const std::string VTYPE_TAG;
@@ -160,14 +175,14 @@ namespace pipedal
         LV2_URID InitUrid(const char*uri, const char*shortUri);
 
         template <typename U>
-        json_variant TypedProperty(const std::string type,U value)
+        static json_variant TypedProperty(const std::string type,U value)
         {
             json_variant result = json_variant::make_object();
             result[OTYPE_TAG] = type;
             result["value"] = json_variant(value);
             return result;
         }
-        json_variant TypedProperty(const std::string type,const json_variant&& value)
+        static json_variant TypedProperty(const std::string type,const json_variant&& value)
         {
             json_variant result = json_variant::make_object();
             result[OTYPE_TAG] = type;

src/AudioHost.cpp

@@ -19,6 +19,7 @@
 
 #include "AudioHost.hpp"
 #include "util.hpp"
+#include <lv2/atom/atom.h>
 
 #include "Lv2Log.hpp"
 
@@ -26,6 +27,9 @@
 #include "AlsaDriver.hpp"
 #include "DummyAudioDriver.hpp"
 #include "AtomConverter.hpp"
+#include <unordered_map>
+#include "PluginHost.hpp"
+#include "PatchPropertyWriter.hpp"
 
 using namespace pipedal;
 
@@ -107,6 +111,167 @@ static std::string GetGovernor()
     return pipedal::GetCpuGovernor();
 }
 
+namespace pipedal
+{
+
+    struct PathPatchProperty
+    {
+        LV2_URID propertyUrid = 0;
+        std::vector<uint8_t> atomBuffer;
+    };
+
+    class IndexedSnapshotValue
+    {
+    private:
+        struct InputControlEntry
+        {
+            bool isInputControl = false;
+            float value = 0;
+        };
+
+    public:
+        IndexedSnapshotValue(IEffect *effect, SnapshotValue *snapshotValue, PluginHost &pluginHost)
+            : pEffect(effect)
+        {
+            auto maxInputControl = effect->GetMaxInputControl();
+            inputControlValues.resize(maxInputControl);
+
+            for (uint64_t i = 0; i < maxInputControl; ++i)
+            {
+                bool isInputControl = effect->IsInputControl(i);
+                if (isInputControl)
+                {
+                    inputControlValues[i] = InputControlEntry{isInputControl : true, value : effect->GetDefaultInputControlValue(i)};
+                }
+                else
+                {
+                    inputControlValues[i] = InputControlEntry{isInputControl : false, value : 0};
+                }
+            }
+            if (snapshotValue)
+            {
+                for (auto &controlValue : snapshotValue->controlValues_)
+                {
+                    auto index = effect->GetControlIndex(controlValue.key());
+                    if (index >= 0 && index < inputControlValues.size())
+                    {
+                        inputControlValues[index].value = controlValue.value();
+                    }
+                }
+                this->lv2State = snapshotValue->lv2State_;
+
+                if (effect->IsLv2Effect())
+                {
+                    Lv2Effect *lv2Effect = (Lv2Effect *)effect;
+                    for (auto &pathProperty : snapshotValue->pathProperties_)
+                    {
+                        // only transmit changed path patch properties.
+                        if (lv2Effect->GetPathPatchProperty(pathProperty.first) != pathProperty.second)
+                        {
+                            lv2Effect->SetPathPatchProperty(pathProperty.first, pathProperty.second);
+
+                            PathPatchProperty pathPatchProperty;
+                            pathPatchProperty.propertyUrid = pluginHost.GetLv2Urid(pathProperty.first.c_str());
+                            // convert to json variant so we do a mappath operation.
+                            json_variant vProperty;
+                            std::istringstream ss(pathProperty.second);
+                            json_reader reader(ss);
+                            reader.read(&vProperty);
+                            vProperty = pluginHost.MapPath(vProperty);
+
+                            // now to atom format (what we want on the rt thread0)
+                            AtomConverter atomConverter(pluginHost.GetMapFeature());
+                            LV2_Atom *atomValue = atomConverter.ToAtom(vProperty);
+
+                            size_t atomBufferSize = (atomValue->size + sizeof(LV2_Atom) + 3) / 4 * 4;
+                            pathPatchProperty.atomBuffer.resize(atomValue->size + sizeof(LV2_Atom));
+                            memcpy(pathPatchProperty.atomBuffer.data(), atomValue, pathPatchProperty.atomBuffer.size());
+                            this->pathPatchProperties.push_back(std::move(pathPatchProperty));
+                        }
+                    }
+                }
+            }
+        }
+        void ApplyValues(IEffect *effect)
+        {
+            if (effect != pEffect)
+            {
+                throw std::runtime_error("Wrong effect");
+            }
+            for (size_t i = 0; i < inputControlValues.size(); ++i)
+            {
+                InputControlEntry &e = inputControlValues[i];
+                if (e.isInputControl)
+                {
+                    effect->SetControl((int)i, e.value);
+                }
+            }
+
+            for (const auto &patchProperty : pathPatchProperties)
+            {
+                effect->SetPatchProperty(
+                    patchProperty.propertyUrid, patchProperty.atomBuffer.size(), (LV2_Atom *)patchProperty.atomBuffer.data());
+            }
+            // effect->SetLv2State(lv2State);
+        }
+
+    private:
+        IEffect *pEffect;
+        Lv2PluginState lv2State;
+        std::vector<InputControlEntry> inputControlValues;
+        std::vector<PathPatchProperty> pathPatchProperties;
+    };
+    class IndexedSnapshot
+    {
+    public:
+        IndexedSnapshot(Snapshot *snapshot, std::shared_ptr<Lv2Pedalboard> currentPedalboard, PluginHost &pluginHost)
+        {
+            std::unordered_map<uint64_t, SnapshotValue *> index;
+            for (auto &value : snapshot->values_)
+            {
+                index[value.instanceId_] = &value;
+            }
+            std::vector<IEffect *> &effects = currentPedalboard->GetEffects();
+            snapshotValues.reserve(effects.size());
+
+            for (size_t i = 0; i < effects.size(); ++i)
+            {
+                auto &effect = effects[i];
+
+                SnapshotValue *snapshotValue = getSnapshotValue(index, effect->GetInstanceId());
+                snapshotValues.push_back(IndexedSnapshotValue(effect, snapshotValue, pluginHost));
+            }
+        }
+        static SnapshotValue *getSnapshotValue(std::unordered_map<uint64_t, SnapshotValue *> &index, uint64_t instanceId)
+        {
+            auto iter = index.find(instanceId);
+            if (iter == index.end())
+            {
+                return nullptr;
+            }
+            return iter->second;
+        }
+
+        void Apply(std::vector<IEffect *> &effects)
+        {
+            if (effects.size() != snapshotValues.size())
+            {
+                throw std::runtime_error("Effects and values don't match");
+            }
+            for (size_t i = 0; i < snapshotValues.size(); ++i)
+            {
+                snapshotValues[i].ApplyValues(effects[i]);
+            }
+        }
+        ~IndexedSnapshot()
+        {
+        }
+
+    private:
+        std::vector<IndexedSnapshotValue> snapshotValues;
+    };
+}
+
 class SystemMidiBinding
 {
 private:
@@ -192,9 +357,12 @@ bool SystemMidiBinding::IsMatch(const MidiEvent &event)
     }
 }
 
-class AudioHostImpl : public AudioHost, private AudioDriverHost
+class AudioHostImpl : public AudioHost, private AudioDriverHost, private IPatchWriterCallback
 {
 private:
+    void OnWritePatchPropertyBuffer(
+        PatchPropertyWriter::Buffer *);
+
     IHost *pHost = nullptr;
     LV2_Atom_Forge inputWriterForge;
 
@@ -368,6 +536,8 @@ private:
 
         StopReaderThread();
 
+        // delete any leaked snapshots.
+        CleanUpSnapshots();
 
         // release any pdealboards owned by the process thread.
         this->activePedalboards.resize(0);
@@ -489,8 +659,26 @@ private:
 
     RealtimePatchPropertyRequest *pParameterRequests = nullptr;
 
+    void cancelParameterRequests()
+    {
+        return;
+
+        // auto p = this->pParameterRequests;
+        // while (pParameterRequests != nullptr)
+        // {
+        //     auto nextParameterRequest = p->pNext;
+        //     if (p->requestType ==  RealtimePatchPropertyRequest::RequestType::PatchGet) {
+        //         p->errorMessage = "Effect unloaded.";
+        //     }
+        //     p = nextParameterRequest;
+        // }
+        // this->realtimeWriter.ParameterRequestComplete(pParameterRequests);
+        // this->pParameterRequests = nullptr;
+    }
+
     bool reEntered = false;
-    void ProcessInputCommands()
+    // returns false if the current effect has been replaced.
+    bool ProcessInputCommands()
     {
         if (reEntered)
         {
@@ -586,6 +774,14 @@ private:
                 }
                 break;
             }
+            case RingBufferCommand::LoadSnapshot:
+            {
+                IndexedSnapshot *snapshot;
+                realtimeReader.readComplete(&snapshot);
+                ApplySnapshot(snapshot);
+                realtimeWriter.FreeSnapshot(snapshot);
+                break;
+            }
             case RingBufferCommand::SetVuSubscriptions:
             {
                 RealtimeVuBuffers *configuration;
@@ -622,16 +818,35 @@ private:
                     // invalidate the possibly no-good subscriptions. Model will update them shortly.
                     freeRealtimeVuConfiguration();
                     freeRealtimeMonitorPortSubscriptions();
+                    cancelParameterRequests();
+
+                    if (realtimeActivePedalboard)
+                    {
+                        realtimeActivePedalboard->ResetAtomBuffers();
+                        // issue patch gets for all writable path properties.
+                        for (auto pEffect : realtimeActivePedalboard->GetEffects())
+                        {
+                            pEffect->RequestAllPathPatchProperties();
                         }
-                break;
+                    }
+                }
+                reEntered = false;
+
+                return false; // signal to caller that the effect has been replaced, and processing needs to start again.
             }
             default:
                 throw PiPedalStateException("Unknown Ringbuffer command.");
             }
         }
         reEntered = false;
+        return true;
     }
 
+    void ApplySnapshot(IndexedSnapshot *snapshot)
+    {
+        auto &effects = this->realtimeActivePedalboard->GetEffects();
+        snapshot->Apply(effects);
+    }
     virtual void AckMidiProgramRequest(uint64_t requestId)
     {
         hostWriter.AckMidiProgramRequest(requestId);
@@ -799,8 +1014,6 @@ private:
 
     std::mutex audioStoppedMutex;
 
-
-
     bool IsAudioRunning()
     {
         return this->active && (!this->audioStopped) && !this->isDummyAudioDriver;
@@ -816,20 +1029,31 @@ private:
         Lv2Log::info("Audio thread terminated.");
     }
 
-
     virtual void OnProcess(size_t nframes)
     {
         try
         {
             float *in, *out;
 
-            pParameterRequests = nullptr;
+            Lv2Pedalboard *pedalboard = nullptr;
+            pedalboard = this->realtimeActivePedalboard;
+            if (pedalboard)
+            {
+                pedalboard->ResetAtomBuffers();
+            }
+            while (true)
+            {
 
-            ProcessInputCommands();
+                if (ProcessInputCommands())
+                {
+                    break;
+                }
+                // else a new pedalboard was installed. start again.
+                pedalboard = this->realtimeActivePedalboard;
+            }
 
             bool processed = false;
 
-            Lv2Pedalboard *pedalboard = this->realtimeActivePedalboard;
             if (pedalboard != nullptr)
             {
                 ProcessMidiInput();
@@ -862,7 +1086,6 @@ private:
 
                 if (buffersValid)
                 {
-                    pedalboard->ResetAtomBuffers();
                     pedalboard->ProcessParameterRequests(pParameterRequests);
 
                     processed = pedalboard->Run(inputBuffers, outputBuffers, (uint32_t)nframes, &realtimeWriter);
@@ -885,6 +1108,7 @@ private:
                         }
                     }
                     pedalboard->GatherPatchProperties(pParameterRequests);
+                    pedalboard->GatherPathPatchProperties(this);
                 }
             }
 
@@ -896,6 +1120,7 @@ private:
             if (pParameterRequests != nullptr)
             {
                 this->realtimeWriter.ParameterRequestComplete(pParameterRequests);
+                pParameterRequests = nullptr;
             }
             // provide a grace period for undderruns, while spinning up. (15 second-ish)
             if (currentSample <= this->overrunGracePeriodSamples && currentSample + nframes > this->overrunGracePeriodSamples)
@@ -926,7 +1151,6 @@ public:
     {
         realtimeAtomBuffer.resize(32 * 1024);
         lv2_atom_forge_init(&inputWriterForge, pHost->GetMapFeature().GetMap());
-
     }
     virtual ~AudioHostImpl()
     {
@@ -1193,6 +1417,18 @@ public:
                                 hostReader.read(&body);
                                 OnActivePedalboardReleased(body.oldEffect);
                             }
+                            else if (command == RingBufferCommand::FreeSnapshot)
+                            {
+                                IndexedSnapshot *snapshot;
+                                hostReader.read(&snapshot);
+                                OnFreeSnapshot(snapshot);
+                            }
+                            else if (command == RingBufferCommand::SendPathPropertyBuffer)
+                            {
+                                PatchPropertyWriter::Buffer *buffer = nullptr;
+                                hostReader.read(&buffer);
+                                OnPathPropertyReceived(buffer);
+                            }
                             else if (command == RingBufferCommand::AudioStopped)
                             {
                                 AudioStoppedBody body;
@@ -1200,7 +1436,8 @@ public:
                                 OnAudioComplete();
                                 return;
                             }
-                            else if (command == RingBufferCommand::MidiProgramChange)
+                            else if (command == RingBufferCommand::
+                                                    MidiProgramChange)
                             {
                                 RealtimeMidiProgramRequest programRequest;
                                 hostReader.read(&programRequest);
@@ -1307,7 +1544,9 @@ public:
         {
             this->isDummyAudioDriver = true;
             this->audioDriver = std::unique_ptr<AudioDriver>(CreateDummyAudioDriver(this));
-        } else {
+        }
+        else
+        {
             this->isDummyAudioDriver = false;
             this->audioDriver = std::unique_ptr<AudioDriver>(CreateAlsaDriver(this));
         }
@@ -1320,7 +1559,6 @@ public:
         this->currentSample = 0;
         this->underruns = 0;
 
-
         this->inputRingBuffer.reset();
         this->outputRingBuffer.reset();
         this->hostReader.Reset();
@@ -1364,6 +1602,18 @@ public:
     {
         pNotifyCallbacks->OnNotifyMidiProgramChange(programRequest);
     }
+
+    void OnPathPropertyReceived(PatchPropertyWriter::Buffer *buffer)
+    {
+        if (pNotifyCallbacks)
+        {
+            pNotifyCallbacks->OnNotifyPathPatchPropertyReceived(
+                buffer->instanceId,
+                buffer->patchPropertyUrid,
+                (LV2_Atom *)(buffer->memory.data()));
+        }
+        buffer->OnBufferReadComplete();
+    }
     void OnActivePedalboardReleased(Lv2Pedalboard *pPedalboard)
     {
         if (pPedalboard)
@@ -1465,6 +1715,49 @@ public:
         }
     }
 
+    std::vector<IndexedSnapshot *> pendingSnapshots;
+
+    virtual void LoadSnapshot(Snapshot &snapshot, PluginHost &pluginHost) override
+    {
+        std::lock_guard guard(mutex);
+        if (active && this->currentPedalboard)
+        {
+            IndexedSnapshot *indexedSnapshot = new IndexedSnapshot(&snapshot, this->currentPedalboard, pluginHost);
+            pendingSnapshots.push_back(indexedSnapshot);
+            this->hostWriter.LoadSnapshot(indexedSnapshot);
+        }
+    }
+
+    void OnNotifyPathPatchPropertyReceived(
+        int64_t instanceId,
+        const std::string &pathPatchPropertyUri,
+        const std::string &jsonAtom) override;
+
+    void OnFreeSnapshot(IndexedSnapshot *snapshot)
+    {
+        {
+            std::lock_guard guard(mutex);
+            for (auto i = pendingSnapshots.begin(); i != pendingSnapshots.end(); ++i)
+            {
+                if (*i == snapshot)
+                {
+                    pendingSnapshots.erase(i);
+                    break;
+                }
+            }
+        }
+        delete snapshot;
+    }
+    void CleanUpSnapshots()
+    {
+        for (auto i = pendingSnapshots.begin(); i != pendingSnapshots.end(); ++i)
+        {
+            IndexedSnapshot *snapshot = *i;
+            delete snapshot;
+        }
+        pendingSnapshots.clear();
+    }
+
     virtual void SetVuSubscriptions(const std::vector<int64_t> &instanceIds)
     {
         std::lock_guard guard(mutex);
@@ -1754,19 +2047,25 @@ void AudioHostImpl::SetSystemMidiBindings(const std::vector<MidiBinding> &bindin
         else if (i->symbol() == "prevProgram")
         {
             this->prevMidiBinding.SetBinding(*i);
-        } else if (i->symbol() == "startHotspot")
+        }
+        else if (i->symbol() == "startHotspot")
         {
             this->startHotspotMidiBinding.SetBinding(*i);
-        } else if (i->symbol() == "stopHotspot")
+        }
+        else if (i->symbol() == "stopHotspot")
         {
             this->stopHotspotMidiBinding.SetBinding(*i);
-        } else if (i->symbol() == "reboot")
+        }
+        else if (i->symbol() == "reboot")
         {
             this->rebootMidiBinding.SetBinding(*i);
-        } else if (i->symbol() == "shutdown")
+        }
+        else if (i->symbol() == "shutdown")
         {
             this->shutdownMidiBinding.SetBinding(*i);
-        } else {
+        }
+        else
+        {
             Lv2Log::error(SS("Invalid system midi binding: " << i->symbol()));
         }
     }
@@ -1793,6 +2092,27 @@ bool AudioHostImpl::UpdatePluginStates(Pedalboard &pedalboard)
     }
     return true;
 }
+
+void AudioHostImpl::OnNotifyPathPatchPropertyReceived(
+    int64_t instanceId,
+    const std::string &pathPatchPropertyUri,
+    const std::string &jsonAtom)
+{
+    if (this->currentPedalboard)
+    {
+        IEffect*effect =  this->currentPedalboard->GetEffect(instanceId);
+        if (!effect)
+        {
+            return;
+        }
+        if (effect->IsLv2Effect())
+        {
+            Lv2Effect*lv2Effect = (Lv2Effect*)effect;
+            lv2Effect->SetPathPatchProperty(pathPatchPropertyUri,jsonAtom);
+        }
+    }
+}
+
 bool AudioHostImpl::UpdatePluginState(PedalboardItem &pedalboardItem)
 {
     IEffect *effect = currentPedalboard->GetEffect(pedalboardItem.instanceId());
@@ -1821,6 +2141,12 @@ bool AudioHostImpl::UpdatePluginState(PedalboardItem &pedalboardItem)
     return false;
 }
 
+void AudioHostImpl::OnWritePatchPropertyBuffer(
+    PatchPropertyWriter::Buffer *buffer)
+{
+    this->realtimeWriter.SendPathPropertyBuffer(buffer);
+}
+
 JSON_MAP_BEGIN(JackHostStatus)
 JSON_MAP_REFERENCE(JackHostStatus, active)
 JSON_MAP_REFERENCE(JackHostStatus, errorMessage)

src/AudioHost.hpp

@@ -32,39 +32,42 @@
 #include "json_variant.hpp"
 #include "RealtimeMidiEventType.hpp"
 
-namespace pipedal {
+namespace pipedal
-
-
-struct RealtimeMidiProgramRequest;
-struct RealtimeNextMidiProgramRequest;
-
-using PortMonitorCallback = std::function<void (int64_t handle, float value)>;
-
-
-class MonitorPortUpdate
 {
-public:
+
+    struct RealtimeMidiProgramRequest;
+    struct RealtimeNextMidiProgramRequest;
+    class PluginHost;
+    class Pedalboard;
+
+    using PortMonitorCallback = std::function<void(int64_t handle, float value)>;
+
+    class MonitorPortUpdate
+    {
+    public:
         PortMonitorCallback *callbackPtr; // pointer because function<>'s probably aren't POD.
         int64_t subscriptionHandle;
         float value;
-};
+    };
-class RealtimePatchPropertyRequest {
+    class RealtimePatchPropertyRequest
-public:
+    {
+    public:
         int64_t clientId;
         int64_t instanceId;
         LV2_URID uridUri;
 
-    enum class RequestType {
+        enum class RequestType
+        {
             PatchGet,
             PatchSet
         };
         RequestType requestType;
 
-    std::function<void (RealtimePatchPropertyRequest*)> onPatchRequestComplete;
+        std::function<void(RealtimePatchPropertyRequest *)> onPatchRequestComplete;
         std::function<void(const std::string &jsonResjult)> onSuccess;
         std::function<void(const std::string &error)> onError;
 
-    const char*errorMessage = nullptr;
+        const char *errorMessage = nullptr;
         std::string jsonResponse;
 
         RealtimePatchPropertyRequest *pNext = nullptr;
@@ -78,27 +81,28 @@ public:
             }
         }
         size_t GetSize() const { return responseLength; }
-    uint8_t *GetBuffer() {
+        uint8_t *GetBuffer()
+        {
             if (responseLength > sizeof(atomBuffer))
             {
                 return &(longAtomBuffer[0]);
             }
             return atomBuffer;
         }
-private:
+
+    private:
         int responseLength = 0;
         uint8_t atomBuffer[2048];
         std::vector<uint8_t> longAtomBuffer;
 
-public:
+    public:
         RealtimePatchPropertyRequest(
-        std::function<void (RealtimePatchPropertyRequest*)> onPatchRequestcomplete_,
+            std::function<void(RealtimePatchPropertyRequest *)> onPatchRequestcomplete_,
             int64_t clientId_,
             int64_t instanceId_,
             LV2_URID uridUri_,
             std::function<void(const std::string &jsonResjult)> onSuccess_,
-        std::function<void(const std::string &error)> onError_
+            std::function<void(const std::string &error)> onError_)
-    )
             : onPatchRequestComplete(onPatchRequestcomplete_),
               clientId(clientId_),
               instanceId(instanceId_),
@@ -109,14 +113,13 @@ public:
             requestType = RequestType::PatchGet;
         }
         RealtimePatchPropertyRequest(
-        std::function<void (RealtimePatchPropertyRequest*)> onPatchRequestcomplete_,
+            std::function<void(RealtimePatchPropertyRequest *)> onPatchRequestcomplete_,
             int64_t clientId_,
             int64_t instanceId_,
             LV2_URID uridUri_,
-        LV2_Atom*atomValue,
+            LV2_Atom *atomValue,
             std::function<void(const std::string &jsonResjult)> onSuccess_,
-        std::function<void(const std::string &error)> onError_
+            std::function<void(const std::string &error)> onError_)
-        )
             : onPatchRequestComplete(onPatchRequestcomplete_),
               clientId(clientId_),
               instanceId(instanceId_),
@@ -125,49 +128,51 @@ public:
               onError(onError_)
         {
             requestType = RequestType::PatchSet;
-            size_t size = atomValue->size+ sizeof(LV2_Atom);
+            size_t size = atomValue->size + sizeof(LV2_Atom);
             SetSize(size);
-            memcpy(GetBuffer(),atomValue,size);
+            memcpy(GetBuffer(), atomValue, size);
         }
+    };
 
-};
+    class MonitorPortSubscription
-
+    {
-
+    public:
-class MonitorPortSubscription {
-public:
         int64_t subscriptionHandle;
         int64_t instanceid;
         std::string key;
         float updateInterval;
         PortMonitorCallback onUpdate;
+    };
 
-};
+    class IAudioHostCallbacks
-
+    {
-class IAudioHostCallbacks {
+    public:
-public:
         virtual void OnNotifyLv2StateChanged(uint64_t instanceId) = 0;
         virtual void OnNotifyMaybeLv2StateChanged(uint64_t instanceId) = 0;
-    virtual void OnNotifyVusSubscription(const std::vector<VuUpdate> & updates) = 0;
+        virtual void OnNotifyVusSubscription(const std::vector<VuUpdate> &updates) = 0;
         virtual void OnNotifyMonitorPort(const MonitorPortUpdate &update) = 0;
         virtual void OnNotifyMidiValueChanged(int64_t instanceId, int portIndex, float value) = 0;
         virtual void OnNotifyMidiListen(bool isNote, uint8_t noteOrControl) = 0;
 
+        virtual void OnNotifyPathPatchPropertyReceived(
+            int64_t instanceId,
+            LV2_URID pathPatchProperty,
+            LV2_Atom *pathProperty) = 0;
 
-    virtual void OnPatchSetReply(uint64_t instanceId, LV2_URID patchSetProperty, const LV2_Atom*atomValue) = 0;
+        virtual void OnPatchSetReply(uint64_t instanceId, LV2_URID patchSetProperty, const LV2_Atom *atomValue) = 0;
 
-    //virtual bool WantsAtomOutput(uint64_t instanceId,LV2_URID patchSetProperty) = 0;
+        // virtual bool WantsAtomOutput(uint64_t instanceId,LV2_URID patchSetProperty) = 0;
-    //virtual void OnNotifyPatchProperty(uint64_t instanceId, LV2_URID patchSetProperty, const std::string&atomJson) = 0;
+        // virtual void OnNotifyPatchProperty(uint64_t instanceId, LV2_URID patchSetProperty, const std::string&atomJson) = 0;
 
-    virtual void OnNotifyMidiProgramChange(RealtimeMidiProgramRequest&midiProgramRequest) = 0;
+        virtual void OnNotifyMidiProgramChange(RealtimeMidiProgramRequest &midiProgramRequest) = 0;
-    virtual void OnNotifyNextMidiProgram(const RealtimeNextMidiProgramRequest&request) = 0;
+        virtual void OnNotifyNextMidiProgram(const RealtimeNextMidiProgramRequest &request) = 0;
-    virtual void OnNotifyLv2RealtimeError(int64_t instanceId,const std::string &error) = 0;
+        virtual void OnNotifyLv2RealtimeError(int64_t instanceId, const std::string &error) = 0;
         virtual void OnNotifyMidiRealtimeEvent(RealtimeMidiEventType eventType) = 0;
+    };
 
-};
+    class JackHostStatus
-
+    {
-
+    public:
-class JackHostStatus {
-public:
         bool active_ = false;
         std::string errorMessage_;
         bool restarting_;
@@ -180,34 +185,33 @@ public:
         std::string governor_;
 
         DECLARE_JSON_MAP(JackHostStatus);
+    };
 
+    class IHost;
 
-};
+    class AudioHost
+    {
+    protected:
+        AudioHost() {}
 
+    public:
+        static AudioHost *CreateInstance(IHost *pHost);
+        virtual ~AudioHost() {};
 
-class IHost;
+        virtual void UpdateServerConfiguration(const JackServerSettings &jackServerSettings,
-
+                                               std::function<void(bool success, const std::string &errorMessage)> onComplete) = 0;
-class AudioHost {
-protected: 
-    AudioHost() { }
-public: 
-    static AudioHost*CreateInstance(IHost *pHost);
-    virtual ~AudioHost() { };
-
-    virtual void UpdateServerConfiguration(const JackServerSettings & jackServerSettings,
-        std::function<void(bool success, const std::string&errorMessage)> onComplete) = 0;
 
         virtual void SetNotificationCallbacks(IAudioHostCallbacks *pNotifyCallbacks) = 0;
 
         virtual void SetListenForMidiEvent(bool listen) = 0;
         virtual void SetListenForAtomOutput(bool listen) = 0;
 
-    virtual bool UpdatePluginStates(Pedalboard& pedalboard) = 0;
+        virtual bool UpdatePluginStates(Pedalboard &pedalboard) = 0;
-    virtual bool UpdatePluginState(PedalboardItem& pedalboardItem) = 0;
+        virtual bool UpdatePluginState(PedalboardItem &pedalboardItem) = 0;
 
-    virtual std::string AtomToJson(const LV2_Atom*atom) = 0;
+        virtual std::string AtomToJson(const LV2_Atom *atom) = 0;
 
-    virtual void Open(const JackServerSettings&jackServerSettings,const JackChannelSelection & channelSelection) = 0;
+        virtual void Open(const JackServerSettings &jackServerSettings, const JackChannelSelection &channelSelection) = 0;
         virtual void Close() = 0;
 
         virtual uint32_t GetSampleRate() = 0;
@@ -216,7 +220,7 @@ public:
 
         virtual void SetPedalboard(const std::shared_ptr<Lv2Pedalboard> &pedalboard) = 0;
 
-    virtual void SetControlValue(uint64_t instanceId,const std::string&symbol, float value) = 0;
+        virtual void SetControlValue(uint64_t instanceId, const std::string &symbol, float value) = 0;
         virtual void SetInputVolume(float value) = 0;
         virtual void SetOutputVolume(float value) = 0;
         virtual void SetPluginPreset(uint64_t instanceId, const std::vector<ControlValue> &values) = 0;
@@ -227,16 +231,19 @@ public:
         virtual void SetVuSubscriptions(const std::vector<int64_t> &instanceIds) = 0;
         virtual void SetMonitorPortSubscriptions(const std::vector<MonitorPortSubscription> &subscriptions) = 0;
 
-    virtual void SetSystemMidiBindings(const std::vector<MidiBinding>&bindings) = 0;
+        virtual void SetSystemMidiBindings(const std::vector<MidiBinding> &bindings) = 0;
 
-    virtual void sendRealtimeParameterRequest(RealtimePatchPropertyRequest*pParameterRequest) = 0;
+        virtual void sendRealtimeParameterRequest(RealtimePatchPropertyRequest *pParameterRequest) = 0;
         virtual void AckMidiProgramRequest(uint64_t requestId) = 0;
 
         virtual JackHostStatus getJackStatus() = 0;
 
-};
+        virtual void LoadSnapshot(Snapshot &snapshot, PluginHost &pluginHost) = 0;
 
+        virtual void OnNotifyPathPatchPropertyReceived(
+            int64_t instanceId,
+            const std::string &pathPatchPropertyUri,
+            const std::string &jsonAtom) = 0;
+    };
 
-
+} // namespace pipedal.
-
-} //namespace pipedal.

src/Banks.hpp

@@ -100,6 +100,7 @@ public:
         presets_.clear();
         selectedPreset_ = -1;
     }
+    
     void move(size_t from, size_t to)
     {
         if (from >= this->presets_.size()) {

src/CMakeLists.txt

@@ -146,6 +146,8 @@ else()
 endif()
 
 set (PIPEDAL_SOURCES
+    PatchPropertyWriter.hpp
+    PresetBundle.cpp PresetBundle.hpp
     RealtimeMidiEventType.hpp
     DBusToLv2Log.cpp DBusToLv2Log.hpp
     HotspotManager.cpp HotspotManager.hpp

src/ConfigMain.cpp

@@ -691,6 +691,10 @@ void SetVarPermissions(
     {
         if (fs::exists(path))
         {
+            if (fs::is_symlink(path))
+            {
+                return;
+            }
             std::ignore = chown(path.c_str(), uid, gid);
             if (fs::is_directory(path))
             {

src/IEffect.hpp

@@ -32,8 +32,19 @@ namespace pipedal {
     public:
         virtual ~IEffect() {}
         virtual uint64_t GetInstanceId() const = 0;
+        virtual bool IsLv2Effect() const = 0;
+        virtual uint64_t GetMaxInputControl() const = 0;
+        virtual bool IsInputControl(uint64_t index) const = 0;
+        virtual float GetDefaultInputControlValue(uint64_t index) const = 0;
+
         virtual int GetControlIndex(const std::string&symbol) const = 0;
         virtual void SetControl(int index, float value)  = 0;
+
+        virtual void SetPatchProperty(LV2_URID uridUri, size_t size, LV2_Atom *value) = 0;
+        virtual void RequestPatchProperty(LV2_URID uridUri) = 0;
+        virtual void RequestAllPathPatchProperties() = 0;
+
+
         virtual float GetControlValue(int index) const = 0;
         virtual void SetBypass(bool enable)  = 0;
         virtual float GetOutputControlValue(int controlIndex) const = 0;
@@ -47,9 +58,6 @@ namespace pipedal {
         virtual bool GetRequestStateChangedNotification() const = 0;
         virtual void SetRequestStateChangedNotification(bool value) = 0;
 
-        //virtual std::string AtomToJson(uint8_t*pAtom) = 0;
-        //virtual std::string GetAtomObjectType(uint8_t*pData) = 0;
-
 
         virtual void SetAudioInputBuffer(int index, float *buffer) = 0;
         virtual void SetAudioOutputBuffer(int index, float*buffer) = 0;
@@ -62,6 +70,7 @@ namespace pipedal {
 
         virtual bool IsVst3() const = 0;
         virtual bool GetLv2State(Lv2PluginState*state) = 0;
+        virtual void SetLv2State(Lv2PluginState&state) = 0;
         
         virtual bool HasErrorMessage() const = 0;
         virtual const char*TakeErrorMessage()  = 0;

src/Lv2Effect.cpp

@@ -50,7 +50,7 @@ Lv2Effect::Lv2Effect(
     IHost *pHost_,
     const std::shared_ptr<Lv2PluginInfo> &info_,
     PedalboardItem &pedalboardItem)
-    : pHost(pHost_), pInstance(nullptr), info(info_), urids(pHost)
+    : pHost(pHost_), pInstance(nullptr), info(info_), urids(pHost), instanceId(pedalboardItem.instanceId())
 {
     auto pWorld = pHost_->getWorld();
 
@@ -60,6 +60,23 @@ Lv2Effect::Lv2Effect(
 
     this->bypass = pedalboardItem.isEnabled();
 
+    // stash a list of known file properties that we want to keep synced.
+    if (info->piPedalUI())
+    {
+        for (auto fileProperty : info->piPedalUI()->fileProperties())
+        {
+            LV2_URID filePropertyUrid = pHost->GetLv2Urid(fileProperty->patchProperty().c_str());
+            this->pathProperties.push_back(filePropertyUrid);
+
+            this->pathPropertyWriters.push_back(PatchPropertyWriter(instanceId, filePropertyUrid));
+            std::vector<PatchPropertyWriter> pathPropertyWriters;
+        }
+    }
+    for (auto &pathProperty: pedalboardItem.pathProperties_)
+    {
+        SetPathPatchProperty(pathProperty.first,pathProperty.second);
+    }
+
     // initialize the atom forge used on the realtime thread.
     LV2_URID_Map *map = this->pHost->GetLv2UridMap();
     lv2_atom_forge_init(&inputForgeRt, map);
@@ -146,9 +163,28 @@ Lv2Effect::Lv2Effect(
 
     this->instanceId = pedalboardItem.instanceId();
 
-    this->controlValues.resize(info->ports().size());
+    PreparePortIndices();
 
     // Copy default pedalboard settings.
+    size_t maxPortIndex = 0;
+    std::vector<std::shared_ptr<Lv2PortInfo>> &t = info->ports();
+    for (std::shared_ptr<Lv2PortInfo> &port : info->ports())
+    {
+        if (port->is_control_port())
+        {
+            auto index = port->index();
+            if (index + 1 > maxPortIndex)
+            {
+                maxPortIndex = index + 1;
+            }
+        }
+    }
+    if (maxPortIndex > info->ports().size())
+    {
+        throw std::runtime_error("Ports are not consecutive");
+    }
+
+    this->controlValues.resize(info->ports().size());
     for (auto i = pedalboardItem.controlValues().begin(); i != pedalboardItem.controlValues().end(); ++i)
     {
         auto &v = (*i);
@@ -158,7 +194,7 @@ Lv2Effect::Lv2Effect(
             this->controlValues[index] = v.value();
         }
     }
-    PreparePortIndices();
+
     ConnectControlPorts();
 
     if (!pedalboardItem.lilvPresetUri().empty())
@@ -194,7 +230,9 @@ void Lv2Effect::RestoreState(PedalboardItem &pedalboardItem)
             if (pedalboardItem.lv2State().isValid_)
             {
                 this->stateInterface->Restore(pedalboardItem.lv2State());
-            } else {
+            }
+            else
+            {
                 // set the state to default state.
                 auto savedState = this->stateInterface->Save();
                 pedalboardItem.lv2State(savedState);
@@ -234,6 +272,9 @@ void Lv2Effect::ConnectControlPorts()
 }
 void Lv2Effect::PreparePortIndices()
 {
+    size_t nPorts = info->ports().size();
+    isInputControlPort.resize(nPorts);
+    this->defaultInputControlValues.resize(nPorts);
 
     for (int i = 0; i < info->ports().size(); ++i)
     {
@@ -270,7 +311,23 @@ void Lv2Effect::PreparePortIndices()
                 }
             }
         }
+        else if (port->is_control_port())
+        {
+            controlIndex[port->symbol()] = port->index();
+            if (port->is_input())
+            {
+                this->isInputControlPort[i] = true;
+                this->defaultInputControlValues[i] = port->default_value();
             }
+        }
+    }
+    size_t maxInputControlPort = isInputControlPort.size();
+    while (maxInputControlPort != 0 && !isInputControlPort[maxInputControlPort - 1])
+    {
+        --maxInputControlPort;
+    }
+    this->maxInputControlPort = maxInputControlPort;
+
     inputAudioBuffers.resize(inputAudioPortIndices.size());
     outputAudioBuffers.resize(outputAudioPortIndices.size());
     inputAtomBuffers.resize(inputAtomPortIndices.size());
@@ -323,13 +380,12 @@ void Lv2Effect::SetAudioOutputBuffer(int index, float *buffer)
 
 int Lv2Effect::GetControlIndex(const std::string &key) const
 {
-    for (int i = 0; i < info->ports().size(); ++i)
+    auto i = controlIndex.find(key);
+    if (i == controlIndex.end())
     {
-        auto &port = info->ports()[i];
-        if (port->symbol() == key)
-            return port->index();
-    }
         return -1;
+    }
+    return i->second;
 }
 
 Lv2Effect::~Lv2Effect()
@@ -438,7 +494,6 @@ void Lv2Effect::Run(uint32_t samples, RealtimeRingBufferWriter *realtimeRingBuff
         worker->EmitResponses();
     }
 
-
     // do soft bypass.
     if (this->bypassSamplesRemaining == 0)
     {
@@ -610,6 +665,14 @@ void Lv2Effect::RequestPatchProperty(LV2_URID uridUri)
     lv2_atom_forge_urid(&inputForgeRt, uridUri);
     lv2_atom_forge_pop(&inputForgeRt, &objectFrame);
 }
+void Lv2Effect::RequestAllPathPatchProperties()
+{
+    for (LV2_URID urid : this->pathProperties)
+    {
+        RequestPatchProperty(urid);
+    }
+}
+
 void Lv2Effect::SetPatchProperty(LV2_URID uridUri, size_t size, LV2_Atom *value)
 {
     lv2_atom_forge_frame_time(&inputForgeRt, 0);
@@ -660,12 +723,68 @@ void Lv2Effect::RelayPatchSetMessages(uint64_t instanceId, RealtimeRingBufferWri
     {
         requestStateChangedNotification = false;
         realtimeRingBufferWriter->Lv2StateChanged(instanceId);
-    } else if (maybeStateChanged)
+    }
+    else if (maybeStateChanged)
     {
         realtimeRingBufferWriter->MaybeLv2StateChanged(instanceId);
     }
 }
 
+void Lv2Effect::GatherPathPatchProperties(IPatchWriterCallback *cbPatchWriter)
+{
+    if (pathPropertyWriters.size() != 0)
+    {
+        LV2_Atom_Sequence *controlInput = (LV2_Atom_Sequence *)GetAtomOutputBuffer();
+        if (controlInput == nullptr)
+        {
+            return;
+        }
+        LV2_ATOM_SEQUENCE_FOREACH(controlInput, ev)
+        {
+
+            auto frame_offset = ev->time.frames; // not really interested.
+
+            if (lv2_atom_forge_is_object_type(&this->outputForgeRt, ev->body.type))
+            {
+                const LV2_Atom_Object *obj = (const LV2_Atom_Object *)&ev->body;
+                if (obj->body.otype == urids.patch__Set)
+                {
+                    // Get the property and value of the set message
+                    const LV2_Atom *property = NULL;
+                    const LV2_Atom *value = NULL;
+
+                    lv2_atom_object_get(
+                        obj,
+                        urids.patch__property, &property,
+                        urids.patch__value, &value,
+                        0);
+
+                    if (property && property->type == urids.atom__URID && value)
+                    {
+                        LV2_URID key = ((const LV2_Atom_URID *)property)->body;
+
+                        for (PatchPropertyWriter &pathPropertyWriter : pathPropertyWriters)
+                        {
+                            if (key == pathPropertyWriter.patchPropertyUrid)
+                            {
+                                auto buffer = pathPropertyWriter.AquireWriteBuffer();
+                                size_t atom_size = value->size + sizeof(LV2_Atom);
+                                buffer->memory.resize(atom_size);
+                                memcpy(buffer->memory.data(), value, atom_size);
+                                break;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        for (auto &writer : this->pathPropertyWriters)
+        {
+            writer.FlushWrites(cbPatchWriter);
+        }
+    }
+}
+
 void Lv2Effect::GatherPatchProperties(RealtimePatchPropertyRequest *pRequest)
 {
     if (pRequest->requestType == RealtimePatchPropertyRequest::RequestType::PatchGet)
@@ -711,6 +830,27 @@ void Lv2Effect::GatherPatchProperties(RealtimePatchPropertyRequest *pRequest)
         }
     }
 }
+
+void Lv2Effect::SetLv2State(Lv2PluginState &state)
+{
+    if (state.isValid_)
+    {
+        return;
+    }
+    if (!this->stateInterface)
+    {
+        return;
+    }
+    try
+    {
+
+        this->stateInterface->Restore(state);
+    }
+    catch (const std::exception &e)
+    {
+        Lv2Log::error("Failed to restore LV2 state.");
+    }
+}
 bool Lv2Effect::GetLv2State(Lv2PluginState *state)
 {
     if (!this->stateInterface)
@@ -755,5 +895,31 @@ void Lv2Effect::OnLogDebug(const char *message)
     Lv2Log::debug(message);
 }
 
-bool Lv2Effect::GetRequestStateChangedNotification() const{ return requestStateChangedNotification; }
+bool Lv2Effect::GetRequestStateChangedNotification() const { return requestStateChangedNotification; }
 void Lv2Effect::SetRequestStateChangedNotification(bool value) { requestStateChangedNotification = value; }
+
+uint64_t Lv2Effect::GetMaxInputControl() const { return maxInputControlPort; }
+
+bool Lv2Effect::IsInputControl(uint64_t index) const
+{
+    if (index < 0 || index >= isInputControlPort.size())
+        return false;
+    return isInputControlPort[index];
+}
+float Lv2Effect::GetDefaultInputControlValue(uint64_t index) const
+{
+    return defaultInputControlValues[index];
+}
+
+std::string Lv2Effect::GetPathPatchProperty(const std::string &propertyUri)
+{
+    if (!this->mainThreadPathProperties.contains(propertyUri))
+    {
+        return "";
+    }
+    return this->mainThreadPathProperties[propertyUri];
+}
+void Lv2Effect::SetPathPatchProperty(const std::string &propertyUri, const std::string &jsonAtom)
+{
+    mainThreadPathProperties[propertyUri] = jsonAtom;
+}

src/Lv2Effect.hpp

@@ -25,6 +25,8 @@
 #include <lilv/lilv.h>
 #include "BufferPool.hpp"
 #include "FileBrowserFilesFeature.hpp"
+#include "PatchPropertyWriter.hpp"
+#include <unordered_map>
 
 #include "IEffect.hpp"
 #include "Worker.hpp"
@@ -42,6 +44,7 @@ namespace pipedal
 {
 
     class RealtimeRingBufferWriter;    
+    class IPatchWriterCallback;
 
     class Lv2Effect : public IEffect, private LogFeature::LogMessageListener
     {
@@ -52,6 +55,8 @@ namespace pipedal
         virtual void OnLogDebug(const char*message);
 
     private:
+        std::unordered_map<std::string,int> controlIndex;
+
         FileBrowserFilesFeature fileBrowserFilesFeature;
         std::unique_ptr<StateInterface> stateInterface;
         void RestoreState(PedalboardItem&pedalboardItem);
@@ -86,6 +91,11 @@ namespace pipedal
         std::vector<const LV2_Feature *> features;
         LV2_Feature *work_schedule_feature = nullptr;
 
+
+        uint64_t maxInputControlPort = 0;
+        std::vector<bool> isInputControlPort;
+        std::vector<float> defaultInputControlValues;
+
         virtual std::string GetUri() const { return info->uri(); }
 
         std::vector<const Lv2PortInfo *> realtimePortInfo;
@@ -99,6 +109,10 @@ namespace pipedal
 
         LV2_Atom_Forge outputForgeRt;
 
+        std::vector<LV2_URID> pathProperties;
+        std::vector<PatchPropertyWriter> pathPropertyWriters;
+
+        std::unordered_map<std::string,std::string> mainThreadPathProperties;
 
         class Urids
         {
@@ -164,6 +178,7 @@ namespace pipedal
                                                     uint32_t size,
                                                     const void *data);
 
+
         void ResetInputAtomBuffer(char*data);
         void ResetOutputAtomBuffer(char*data);
 
@@ -179,17 +194,29 @@ namespace pipedal
 
         void BypassTo(float value);
 
+
     public:
 
-        virtual bool GetLv2State(Lv2PluginState*state);
+        // non RT-thread use only.
-        virtual void RequestPatchProperty(LV2_URID uridUri);
+        std::string GetPathPatchProperty(const std::string&propertyUri);
-        virtual void SetPatchProperty(LV2_URID uridUri,size_t size, LV2_Atom*value);
+        // non RT-thread use only.
-        virtual bool GetRequestStateChangedNotification() const;
+        void SetPathPatchProperty(const std::string &propertyUri, const std::string&jsonAtom);
-        virtual void SetRequestStateChangedNotification(bool value);
+
+        virtual bool IsLv2Effect() const { return true; }
+        virtual bool GetLv2State(Lv2PluginState*state) override;
+        virtual void SetLv2State(Lv2PluginState&state) override;
+
+        virtual void RequestPatchProperty(LV2_URID uridUri) ;
+        virtual void SetPatchProperty(LV2_URID uridUri,size_t size, LV2_Atom*value) override;
+        virtual void RequestAllPathPatchProperties();
+
+        virtual bool GetRequestStateChangedNotification() const override;
+        virtual void SetRequestStateChangedNotification(bool value)  override;
 
         virtual void GatherPatchProperties(RealtimePatchPropertyRequest*pRequest);
+        void GatherPathPatchProperties(IPatchWriterCallback *cbPatchWriter);        
         virtual bool IsVst3() const { return false; }
-        virtual void RelayPatchSetMessages(uint64_t instanceId,RealtimeRingBufferWriter *realtimeRingBufferWriter);
+        virtual void RelayPatchSetMessages(uint64_t instanceId,RealtimeRingBufferWriter *realtimeRingBufferWriter) ;
 
         virtual uint8_t*GetAtomInputBuffer() {
             if (this->inputAtomBuffers.size() == 0) return nullptr;
@@ -240,7 +267,7 @@ namespace pipedal
 
         virtual int GetControlIndex(const std::string &symbol) const;
 
-        virtual void SetControl(int index, float value)
+        virtual void SetControl(int index, float value) override
         {
             if (index == -1)
             {
@@ -250,6 +277,11 @@ namespace pipedal
             }
         }
 
+        virtual uint64_t GetMaxInputControl() const override;
+        virtual bool IsInputControl(uint64_t index) const override;
+        virtual float GetDefaultInputControlValue(uint64_t index) const override;
+
+
         virtual float GetControlValue(int index) const {
             if (index == -1) 
             {

src/Lv2Pedalboard.cpp

@@ -507,6 +507,19 @@ void Lv2Pedalboard::ResetAtomBuffers()
     }
 }
 
+
+void Lv2Pedalboard::GatherPathPatchProperties(IPatchWriterCallback*cbPatchWriter)
+{
+    for (auto& pEffect : this->effects) {
+        if (pEffect->IsLv2Effect())
+        {
+            Lv2Effect *pLv2Effect = (Lv2Effect*)pEffect.get();
+            pLv2Effect->GatherPathPatchProperties(cbPatchWriter);
+        }
+    }
+}
+
+
 void Lv2Pedalboard::ProcessParameterRequests(RealtimePatchPropertyRequest *pParameterRequests)
 {
     while (pParameterRequests != nullptr)
@@ -521,6 +534,8 @@ void Lv2Pedalboard::ProcessParameterRequests(RealtimePatchPropertyRequest *pPara
             pParameterRequests->errorMessage = "Not supported for VST3 plugins";
         }
         else
+        {
+            if (pEffect->IsLv2Effect())
             {
                 Lv2Effect *pLv2Effect = dynamic_cast<Lv2Effect *>(pEffect);
 
@@ -537,10 +552,12 @@ void Lv2Pedalboard::ProcessParameterRequests(RealtimePatchPropertyRequest *pPara
                     pLv2Effect->SetRequestStateChangedNotification(true);
                 }
             }
+        }
         pParameterRequests = pParameterRequests->pNext;
     }
 }
 
+
 void Lv2Pedalboard::GatherPatchProperties(RealtimePatchPropertyRequest *pParameterRequests)
 {
     while (pParameterRequests != nullptr)
@@ -557,11 +574,14 @@ void Lv2Pedalboard::GatherPatchProperties(RealtimePatchPropertyRequest *pParamet
                 pParameterRequests->errorMessage = "Not supported for VST3";
             }
             else
+            {
+                if (effect->IsLv2Effect())
                 {
                     Lv2Effect *pLv2Effect = dynamic_cast<Lv2Effect *>(effect);
                     pLv2Effect->GatherPatchProperties(pParameterRequests);
                 }
             }
+        }
 
         pParameterRequests = pParameterRequests->pNext;
     }

src/Lv2Pedalboard.hpp

@@ -27,36 +27,37 @@
 #include <functional>
 #include "DbDezipper.hpp"
 
-namespace pipedal {
+namespace pipedal
-
-
-
-class RealtimeVuBuffers;
-class RealtimePatchPropertyRequest;
-class RealtimeRingBufferWriter;
-
-struct Lv2PedalboardError {
-    int64_t intanceId;
-    std::string message;
-};
-
-class Lv2PedalboardErrorList: public std::vector<Lv2PedalboardError> // (forward declaration issues with a using statement)
 {
 
-};
+    class IPatchWriterCallback;
+    class RealtimeVuBuffers;
+    class RealtimePatchPropertyRequest;
+    class RealtimeRingBufferWriter;
 
-class Lv2Pedalboard {
+    struct Lv2PedalboardError
+    {
+        int64_t intanceId;
+        std::string message;
+    };
+
+    class Lv2PedalboardErrorList : public std::vector<Lv2PedalboardError> // (forward declaration issues with a using statement)
+    {
+    };
+
+    class Lv2Pedalboard
+    {
         IHost *pHost = nullptr;
 
         DbDezipper inputVolume;
         DbDezipper outputVolume;
 
         BufferPool bufferPool;
-    std::vector<float*> pedalboardInputBuffers;
+        std::vector<float *> pedalboardInputBuffers;
-    std::vector<float*> pedalboardOutputBuffers;
+        std::vector<float *> pedalboardOutputBuffers;
 
-    std::vector<std::shared_ptr<IEffect> > effects;
+        std::vector<std::shared_ptr<IEffect>> effects;
-    std::vector<IEffect* > realtimeEffects; // std::shared_ptr is not thread-safe!!
+        std::vector<IEffect *> realtimeEffects;
 
         using Action = std::function<void()>;
         using ProcessAction = std::function<void(uint32_t frames)>;
@@ -71,13 +72,15 @@ class Lv2Pedalboard {
 
         RealtimeRingBufferWriter *ringBufferWriter;
 
-    enum class MappingType {
+        enum class MappingType
+        {
             Linear,
             Circular,
             Momentary,
             Latched,
         };
-    class MidiMapping {
+        class MidiMapping
+        {
         public:
             std::shared_ptr<Lv2PluginInfo> pluginInfo; // lifecycle
             const Lv2PortInfo *pPortInfo = nullptr;    // owned by port.
@@ -93,36 +96,39 @@ class Lv2Pedalboard {
 
         std::vector<MidiMapping> midiMappings;
 
+        std::vector<float *> PrepareItems(
+            std::vector<PedalboardItem> &items,
+            std::vector<float *> inputBuffers,
+            Lv2PedalboardErrorList &errorList);
 
-    std::vector<float*> PrepareItems(
+        void PrepareMidiMap(const Pedalboard &pedalboard);
-        std::vector<PedalboardItem> & items,
+        void PrepareMidiMap(const PedalboardItem &pedalboardItem);
-        std::vector<float*> inputBuffers,
-        Lv2PedalboardErrorList &errorList
-        );
 
-    void PrepareMidiMap(const Pedalboard&pedalboard);
+        std::vector<float *> AllocateAudioBuffers(int nChannels);
-    void PrepareMidiMap(const PedalboardItem&pedalboardItem);
-
-    std::vector<float*> AllocateAudioBuffers(int nChannels);
         int CalculateChainInputs(const std::vector<float *> &inputBuffers, const std::vector<PedalboardItem> &items);
-    void AppendParameterRequest(uint8_t*atomBuffer, LV2_URID uridParameter);
+        void AppendParameterRequest(uint8_t *atomBuffer, LV2_URID uridParameter);
-public:
-    Lv2Pedalboard() { }
-    ~Lv2Pedalboard() { }
 
-    void Prepare(IHost *pHost,Pedalboard&pedalboard, Lv2PedalboardErrorList &errorList);
+    public:
+        Lv2Pedalboard() {}
+        ~Lv2Pedalboard() {}
 
-    std::vector<IEffect* > GetEffects() { return realtimeEffects; }
+        void Prepare(IHost *pHost, Pedalboard &pedalboard, Lv2PedalboardErrorList &errorList);
 
-    int GetIndexOfInstanceId(uint64_t instanceId) {
+        std::vector<IEffect *> &GetEffects() { return realtimeEffects; }
+
+        int GetIndexOfInstanceId(uint64_t instanceId)
+        {
             for (int i = 0; i < this->realtimeEffects.size(); ++i)
             {
-            if (this->realtimeEffects[i]->GetInstanceId() == instanceId) return i;
+                if (this->realtimeEffects[i]->GetInstanceId() == instanceId)
+                    return i;
             }
             return -1;
         }
-    IEffect*GetEffect(uint64_t instanceId) {
+        IEffect *GetEffect(uint64_t instanceId)
-        for (int i = 0; i < realtimeEffects.size(); ++i) {
+        {
+            for (int i = 0; i < realtimeEffects.size(); ++i)
+            {
                 if (realtimeEffects[i]->GetInstanceId() == instanceId)
                 {
                     return realtimeEffects[i];
@@ -132,35 +138,31 @@ public:
         }
         void Activate();
         void Deactivate();
-    bool Run(float**inputBuffers, float**outputBuffers,uint32_t samples, RealtimeRingBufferWriter*realtimeWriter);
+        bool Run(float **inputBuffers, float **outputBuffers, uint32_t samples, RealtimeRingBufferWriter *realtimeWriter);
 
         void ResetAtomBuffers();
 
-
         void ProcessParameterRequests(RealtimePatchPropertyRequest *pParameterRequests);
         void GatherPatchProperties(RealtimePatchPropertyRequest *pParameterRequests);
+        void GatherPathPatchProperties(IPatchWriterCallback *cbPatchWriter);
 
+        std::vector<float *> &GetInputBuffers() { return this->pedalboardInputBuffers; }
+        std::vector<float *> &GetoutputBuffers() { return this->pedalboardOutputBuffers; }
 
-    std::vector<float*> &GetInputBuffers() { return this->pedalboardInputBuffers;}
+        int GetControlIndex(uint64_t instanceId, const std::string &symbol);
-    std::vector<float*> &GetoutputBuffers() { return this->pedalboardOutputBuffers;}
-
-
-
-    int GetControlIndex(uint64_t instanceId,const std::string&symbol);
         void SetControlValue(int effectIndex, int portIndex, float value);
-    void SetInputVolume(float value) { this->inputVolume.SetTarget(value);}
+        void SetInputVolume(float value) { this->inputVolume.SetTarget(value); }
-    void SetOutputVolume(float value) { this->outputVolume.SetTarget(value);}
+        void SetOutputVolume(float value) { this->outputVolume.SetTarget(value); }
-    void SetBypass(int effectIndex,bool enabled);
+        void SetBypass(int effectIndex, bool enabled);
 
-    void ComputeVus(RealtimeVuBuffers *vuConfiguration, uint32_t samples, float**inputBuffers, float**outputBuffers);
+        void ComputeVus(RealtimeVuBuffers *vuConfiguration, uint32_t samples, float **inputBuffers, float **outputBuffers);
 
         float GetControlOutputValue(int effectIndex, int portIndex);
 
-    typedef void (MidiCallbackFn) (void* data,uint64_t intanceId, int controlIndex, float value);
+        typedef void(MidiCallbackFn)(void *data, uint64_t intanceId, int controlIndex, float value);
-    void OnMidiMessage(size_t size, uint8_t*data,
+        void OnMidiMessage(size_t size, uint8_t *data,
                            void *callbackHandle,
-            MidiCallbackFn*pfnCallback);
+                           MidiCallbackFn *pfnCallback);
-        
+    };
-};
 
 } // namespace

src/PatchPropertyWriter.hpp

@@ -0,0 +1,198 @@
+// Copyright (c) 2024 Robin Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#pragma once
+
+#include <vector>
+#include <cstdint>
+#include <atomic>
+#include <stdexcept>
+#include "util.hpp"
+#include <lv2/atom/atom.h>
+namespace pipedal
+{
+
+    // A mechanism for writing (path) patch properties back to the non-realtime threads.
+    // Has the following characteristics:
+    // 1. Only one property in flight to the non-realtime thread at any givien moment.
+    // 2. No blocking, no spinning on the realtime thread. RT operations require nothing other than atomic operations.
+    // 3. Multiple responses in the same RT frame are coaslesced into one response (the latest).
+    // 4. Responses that are found while a property notification is in flight are coaslesced.
+
+    class IPatchWriterCallback;
+
+    class PatchPropertyWriter
+    {
+    private:
+        enum class StateT : char
+        {
+            Empty,
+            WriteStarted,
+            WriteLocked, // written data is available.
+            ReadLocked,  // data is in flight between the realtime thread and non-realtime service thread.
+            Deleted      // detect use after free.
+        };
+
+    public:
+        PatchPropertyWriter(int64_t instanceId, LV2_URID patchPropertyUrid)
+            : instanceId(instanceId), patchPropertyUrid(patchPropertyUrid),
+              buffer0(new Buffer(instanceId, patchPropertyUrid)),
+              buffer1(new Buffer(instanceId, patchPropertyUrid))
+        {
+        }
+        // no copy.
+        PatchPropertyWriter(const PatchPropertyWriter&) = delete;
+        // move
+        PatchPropertyWriter(PatchPropertyWriter&&other) {
+            std::swap(this->buffer0,other.buffer0);
+            std::swap(this->buffer1,other.buffer1);
+            this->currentWriteBuffer = nullptr;
+            this->instanceId = other.instanceId;
+            this->patchPropertyUrid = other.patchPropertyUrid;
+
+        }
+
+        ~PatchPropertyWriter()
+        {
+            delete buffer0;
+            delete buffer1;
+        }
+        class Buffer
+        {
+        public:
+            std::atomic<StateT> state{StateT::Empty};
+
+            Buffer(int64_t instanceId, LV2_URID propertyUrid)
+                : instanceId(instanceId), patchPropertyUrid(propertyUrid)
+            {
+                memory.reserve(1024);
+            }
+
+            void OnBufferWriteStarted()
+            {
+                if (state != StateT::Empty && state != StateT::WriteLocked)
+                {
+                    throw std::runtime_error("Bad state.");
+                }
+                state = StateT::WriteStarted;
+            }
+            void OnBufferWritten()
+            {
+                if (state != StateT::WriteStarted)
+                {
+                    throw std::runtime_error("Bad state.");
+                }
+                state = StateT::ReadLocked;
+                WriteBarrier();
+            }
+
+            void OnBufferReadStarted()
+            {
+                if (state != StateT::ReadLocked)
+                {
+                    throw std::runtime_error("Bad state.");
+                }
+                ReadBarrier();
+            }
+            void OnBufferReadComplete()
+            {
+                if (state != StateT::ReadLocked)
+                {
+                    throw std::runtime_error("Bad state.");
+                }
+                state = StateT::Empty;
+            }
+            int64_t instanceId;
+            LV2_URID patchPropertyUrid;
+
+            std::vector<uint8_t> memory;
+        };
+
+        // RT thread only.
+        Buffer *AquireWriteBuffer()
+        {
+            // RT only.
+            if (currentWriteBuffer)
+            {
+                return currentWriteBuffer;
+            }
+            if (buffer0->state == StateT::Empty)
+            {
+                buffer0->OnBufferWriteStarted();
+                currentWriteBuffer = buffer0;
+                return currentWriteBuffer;
+            }
+            if (buffer1->state == StateT::Empty)
+            {
+                buffer1->OnBufferWriteStarted();
+                currentWriteBuffer = buffer1;
+                return currentWriteBuffer;
+            }
+            throw std::runtime_error("Bad state. Unable to aquire a write buffer.");
+        }
+        // RT thread ony.
+        void OnBufferWritten()
+        {
+            if (currentWriteBuffer)
+            {
+                currentWriteBuffer->OnBufferWritten();
+                currentWriteBuffer = nullptr;
+            }
+        }
+        Buffer *GetCurrentWriteBuffer()
+        {
+            return currentWriteBuffer;
+        }
+
+        void FlushWrites(IPatchWriterCallback*cbWrite);
+
+        int64_t instanceId;
+        LV2_URID patchPropertyUrid;
+
+    private:
+        Buffer *buffer0 = 0;
+        Buffer *buffer1 = 0;
+        Buffer *currentWriteBuffer = nullptr;
+    };
+
+    class IPatchWriterCallback {
+    public:
+        virtual void OnWritePatchPropertyBuffer(
+            PatchPropertyWriter::Buffer *
+        ) = 0;
+    };
+
+    inline void PatchPropertyWriter::FlushWrites(IPatchWriterCallback*cbWrite)
+    {
+        auto buffer = GetCurrentWriteBuffer();
+        if (buffer)
+        {   
+            // is the OTHER buffer empty?
+            if (buffer0->state == StateT::Empty || buffer1->state == StateT::Empty)
+            {
+                OnBufferWritten();
+                cbWrite->OnWritePatchPropertyBuffer(buffer);
+            } else {
+                // we have an update in flight, so just keep accumulating, and maybe write next time.
+            }
+        }
+    }
+
+
+}

src/Pedalboard.cpp

@@ -19,6 +19,7 @@
 
 #include "pch.h"
 #include "Pedalboard.hpp"
+#include "AtomConverter.hpp"
 
 
 using namespace pipedal;
@@ -177,9 +178,200 @@ bool IsPedalboardSplitItem(const PedalboardItem*self, const std::vector<Pedalboa
     return self->uri() == SPLIT_PEDALBOARD_ITEM_URI;
 }
 
+bool Pedalboard::ApplySnapshot(int64_t snapshotIndex)
+{
+    if (snapshotIndex < 0 || 
+        snapshotIndex >= this->snapshots_.size() || 
+        this->snapshots_[snapshotIndex] == nullptr ||
+        this->selectedSnapshot() == snapshotIndex)
+    {
+        return false;
+    }
+    std::map<int64_t, SnapshotValue*> indexedValues;
+    Snapshot *snapshot = this->snapshots_[snapshotIndex].get();
+
+    for (auto &value: snapshot->values_)
+    {
+        indexedValues[value.instanceId_] = &value;
+    }
+
+    auto plugins = this->GetAllPlugins();
+    for (PedalboardItem *pedalboardItem: plugins)
+    {
+        SnapshotValue*snapshotValue = indexedValues[pedalboardItem->instanceId()];
+        if (snapshotValue)
+        {
+            pedalboardItem->ApplySnapshotValue(snapshotValue);
+        }
+    }
+    return true;
+}
+
+void PedalboardItem::ApplySnapshotValue(SnapshotValue*snapshotValue)
+{
+    std::map<std::string,float> cumulativeValues;
+    for (auto &controlValue: this->controlValues())
+    {
+        cumulativeValues[controlValue.key()] = controlValue.value();
+    }
+    for (auto&controlValue : snapshotValue->controlValues_)
+    {
+        cumulativeValues[controlValue.key()] = controlValue.value();
+    }
+    this->controlValues().clear();
+    for (auto&pair: cumulativeValues)
+    {
+        this->controlValues_.push_back(ControlValue(pair.first.c_str(),pair.second));
+    }
+    if (this->lv2State() != snapshotValue->lv2State_)
+    {
+        this->lv2State(snapshotValue->lv2State_);
+        this->stateUpdateCount(this->stateUpdateCount()+1);
+    }
+
+}
 
 
+// can we just send a snapshot-style uddate instead of reloading plugins? All settings are ignored.
+bool Pedalboard::IsStructureIdentical(const Pedalboard &other) const
+{
+    if (this->nextInstanceId_ != other.nextInstanceId_) // quick check that catches 95% of structural changes.
+    {
+        return false;
+    }
+    if (this->items_.size() != other.items_.size()) 
+    {
+        return false;
+    }
+    for (size_t i = 0; i < this->items_.size();++i) 
+    {
+        if (!this->items_[i].IsStructurallyIdentical(other.items_[i]))
+        {
+            return false;
+        }
+    }
+    return true;
+}
 
+bool PedalboardItem::IsStructurallyIdentical(const PedalboardItem&other) const
+{
+    if (this->instanceId() != other.instanceId()) // must match in order to ensure that realtime message passing works.
+    {
+        return false;
+    }
+    if (this->uri() != other.uri())
+    {
+        return false;
+    }
+    if (this->isSplit()) // so is the other by virtue of idential uris.
+    {
+        if (topChain().size() != other.topChain().size())
+        {
+            return false;
+        }
+        for (size_t i = 0; i < topChain().size(); ++i)
+        {
+            if (!topChain()[i].IsStructurallyIdentical(other.topChain()[i] ))
+            {
+                return false;
+            }
+        }
+        if (bottomChain().size() != other.bottomChain().size())
+        {
+            for (size_t i = 0; i < bottomChain().size(); ++i)
+            {
+                if (!bottomChain()[i].IsStructurallyIdentical(other.bottomChain()[i]))
+                {
+                    return false;
+                }
+            }
+        }
+    }
+    return true;
+}
+
+void PedalboardItem::AddToSnapshotFromCurrentSettings(Snapshot&snapshot) const
+{
+    SnapshotValue snapshotValue;
+    snapshotValue.instanceId_ = this->instanceId_;
+
+    for (const ControlValue &value: this->controlValues_)
+    {
+        snapshotValue.controlValues_.push_back(value);
+    }
+    for (const auto&pathProperty: this->pathProperties_)
+    {
+        snapshotValue.pathProperties_[pathProperty.first] = pathProperty.second;
+    }
+    snapshotValue.lv2State_ = this->lv2State_;
+    snapshot.values_.push_back(std::move(snapshotValue));
+
+    if (this->isSplit())
+    {
+        for (auto&item: this->topChain_)
+        {
+            item.AddToSnapshotFromCurrentSettings(snapshot);;
+        }
+        for (auto&item: this->bottomChain_)
+        {
+            item.AddToSnapshotFromCurrentSettings(snapshot);
+        }
+    }
+}
+
+void PedalboardItem::AddResetsForMissingProperties(Snapshot&snapshot, size_t*index) const
+{
+    // structure must be identical
+    // items must be enumerated in the same order as AddToSnapshotFromCurrentSettings
+    SnapshotValue&snapshotValue = snapshot.values_[*index];
+    
+    if (snapshotValue.instanceId_ != this->instanceId())
+    {
+        throw std::runtime_error("Pedalboard structure does not match.");
+    }
+
+    for (auto&property: this->pathProperties_)
+    {
+        auto f = snapshotValue.pathProperties_.find(property.first);
+        if (f == snapshotValue.pathProperties_.end())
+        {
+            snapshotValue.pathProperties_[property.first] = AtomConverter::EmptyPathstring();
+        }
+    }   
+    ++(*index);
+
+    if (this->isSplit())
+    {
+        for (auto&item: this->topChain())
+        {
+            item.AddResetsForMissingProperties(snapshot,index);
+        }
+        for (auto&item: this->bottomChain())
+        {
+            item.AddResetsForMissingProperties(snapshot,index);
+        }
+    }
+
+}
+
+Snapshot Pedalboard::MakeSnapshotFromCurrentSettings(const Pedalboard &previousPedalboard)
+{
+    Snapshot snapshot;
+    // name and color don't matter. this is strictly for loading purposes.
+    for (auto &item : this->items())
+    {
+        item.AddToSnapshotFromCurrentSettings(snapshot);
+    }
+    // a neccesary precondition: the previous pedalboard must have identical structure, 
+    // so we can just 
+    size_t index = 0;
+    for (auto&item: previousPedalboard.items_)
+    {
+        item.AddResetsForMissingProperties(snapshot,&index);
+    }
+    return snapshot;
+
+}
 
 
 
@@ -202,6 +394,7 @@ JSON_MAP_BEGIN(PedalboardItem)
     JSON_MAP_REFERENCE(PedalboardItem,stateUpdateCount)
     JSON_MAP_REFERENCE(PedalboardItem,lv2State)
     JSON_MAP_REFERENCE(PedalboardItem,lilvPresetUri)
+    JSON_MAP_REFERENCE(PedalboardItem,pathProperties)
 JSON_MAP_END()
 
 
@@ -211,5 +404,21 @@ JSON_MAP_BEGIN(Pedalboard)
     JSON_MAP_REFERENCE(Pedalboard,output_volume_db)
     JSON_MAP_REFERENCE(Pedalboard,items)
     JSON_MAP_REFERENCE(Pedalboard,nextInstanceId)
+    JSON_MAP_REFERENCE(Pedalboard,snapshots)
+    JSON_MAP_REFERENCE(Pedalboard,selectedSnapshot)
 JSON_MAP_END()
 
+JSON_MAP_BEGIN(SnapshotValue)
+    JSON_MAP_REFERENCE(SnapshotValue,instanceId)
+    JSON_MAP_REFERENCE(SnapshotValue,controlValues)
+    JSON_MAP_REFERENCE(SnapshotValue,lv2State)
+    JSON_MAP_REFERENCE(SnapshotValue,pathProperties)
+JSON_MAP_END()
+
+JSON_MAP_BEGIN(Snapshot)
+    JSON_MAP_REFERENCE(Snapshot,name)
+    JSON_MAP_REFERENCE(Snapshot,color)
+    JSON_MAP_REFERENCE(Snapshot,values)
+JSON_MAP_END()
+
+

src/Pedalboard.hpp

@@ -26,6 +26,8 @@
 #include "atom_object.hpp"
 
 namespace pipedal {
+    class SnapshotValue;
+    class Snapshot;
     
 #define SPLIT_PEDALBOARD_ITEM_URI  "uri://two-play/pipedal/pedalboard#Split"
 #define EMPTY_PEDALBOARD_ITEM_URI  "uri://two-play/pipedal/pedalboard#Empty"
@@ -45,7 +47,9 @@ namespace pipedal {
 
 #define GETTER_SETTER_VEC(name) \
     decltype(name##_)& name()  { return name##_;}  \
-    const decltype(name##_)& name() const  { return name##_;} 
+    const decltype(name##_)& name() const  { return name##_;} \
+    void name(decltype(name##_)&&value) { this->name##_ = std::move(value); }\
+    void name(const decltype(name##_)&value) { this->name##_ = value; }
 
 
 
@@ -91,12 +95,16 @@ public:
     uint32_t stateUpdateCount_ = 0;
     Lv2PluginState lv2State_;
     std::string lilvPresetUri_;
+    std::map<std::string,std::string> pathProperties_;
 
     // non persistent state.
     PropertyMap patchProperties;
 public:
     ControlValue*GetControlValue(const std::string&symbol);
 
+    bool IsStructurallyIdentical(const PedalboardItem&other) const;
+
+    void ApplySnapshotValue(SnapshotValue*snapshotValue);
     bool hasLv2State() const {
         return lv2State_.isValid_ != 0;
     }
@@ -124,6 +132,10 @@ public:
         return uri_ == EMPTY_PEDALBOARD_ITEM_URI;
     }
 
+    void AddToSnapshotFromCurrentSettings(Snapshot&snapshot) const;
+    void AddResetsForMissingProperties(Snapshot&snapshot, size_t*index) const;
+
+
     virtual void write_members(json_writer&writer) const {
         writer.write_member("instanceId",instanceId_);
         writer.write_member("uri",uri_);
@@ -139,6 +151,25 @@ public:
     DECLARE_JSON_MAP(PedalboardItem);
 };
 
+class SnapshotValue {
+public:
+    uint64_t instanceId_;
+    std::vector<ControlValue> controlValues_;
+    Lv2PluginState lv2State_;
+    std::map<std::string,std::string> pathProperties_;
+    DECLARE_JSON_MAP(SnapshotValue);
+    
+};
+
+class Snapshot {
+public:
+    std::string name_;
+    std::string color_;
+    std::vector<SnapshotValue> values_;
+
+    DECLARE_JSON_MAP(Snapshot);
+
+};
 
 class Pedalboard {
     std::string name_;
@@ -149,22 +180,31 @@ class Pedalboard {
     uint64_t nextInstanceId_ = 0;
     uint64_t NextInstanceId() { return ++nextInstanceId_; }
 
+    std::vector<std::shared_ptr<Snapshot>> snapshots_;
+    int64_t selectedSnapshot_ = -1;
+
 public:
     static constexpr int64_t INPUT_VOLUME_ID = -2; // synthetic PedalboardItem for input volume.
     static constexpr int64_t OUTPUT_VOLUME_ID = -3; // synthetic PedalboardItem for output volume.
     bool SetControlValue(int64_t pedalItemId, const std::string &symbol, float value);
     bool SetItemEnabled(int64_t pedalItemId, bool enabled);
 
+    bool IsStructureIdentical(const Pedalboard &other) const; // caan we just send a snapshot-style uddate instead of reloading plugins? All settings are ignored.
+    Snapshot MakeSnapshotFromCurrentSettings(const Pedalboard &previousPedalboard);
+
     PedalboardItem*GetItem(int64_t pedalItemId);
     const PedalboardItem*GetItem(int64_t pedalItemId) const;
     std::vector<PedalboardItem*>GetAllPlugins();
 
     bool HasItem(int64_t pedalItemid) const { return GetItem(pedalItemid) != nullptr; }
+    bool ApplySnapshot(int64_t snapshotIndex);
 
     GETTER_SETTER_REF(name)
     GETTER_SETTER_VEC(items)
     GETTER_SETTER(input_volume_db)
     GETTER_SETTER(output_volume_db)
+    GETTER_SETTER_VEC(snapshots)
+    GETTER_SETTER(selectedSnapshot)
 
 
     DECLARE_JSON_MAP(Pedalboard);

src/PiPedalModel.cpp

@@ -89,16 +89,15 @@ PiPedalModel::PiPedalModel()
             this->OnUpdateStatusChanged(updateStatus);
         });
 
-
     DbusLogToLv2Log();
     SetDBusLogLevel(DBusLogLevel::Info);
 
     hotspotManager = HotspotManager::Create();
     hotspotManager->SetNetworkChangingListener(
-        [this](bool ethernetConnected, bool hotspotEnabling) {
+        [this](bool ethernetConnected, bool hotspotEnabling)
-            OnNetworkChanging(ethernetConnected,hotspotEnabling);
+        {
-        }
+            OnNetworkChanging(ethernetConnected, hotspotEnabling);
-    );
+        });
     // don't actuall start the hotspotManager until after LV2 is initialized (in order to avoid logging oddities)
 }
 
@@ -113,8 +112,8 @@ void PiPedalModel::Close()
         }
         closed = true;
 
-
+        if (avahiService)
-        if (avahiService) {
+        {
             this->avahiService = nullptr; // and close.
         }
 
@@ -361,7 +360,7 @@ void PiPedalModel::OnNotifyLv2StateChanged(uint64_t instanceId)
 {
     // a sent PATCH_Set, or an explicit state changed notification.
     OnNotifyMaybeLv2StateChanged(instanceId);
-    this->SetPresetChanged(-1, true);
+    this->SetPresetChanged(-1, true, false);
 }
 
 void PiPedalModel::OnNotifyMaybeLv2StateChanged(uint64_t instanceId)
@@ -566,6 +565,69 @@ void PiPedalModel::SetPedalboard(int64_t clientId, Pedalboard &pedalboard)
         this->SetPresetChanged(clientId, true);
     }
 }
+
+void PiPedalModel::SetSnapshot(int64_t selectedSnapshot)
+{
+    std::lock_guard<std::recursive_mutex> lock(mutex);
+    if (this->pedalboard.selectedSnapshot() == selectedSnapshot)
+    {
+        return;
+    }
+    if (this->pedalboard.ApplySnapshot(selectedSnapshot))
+    {
+        if (this->audioHost)
+        {
+            this->audioHost->LoadSnapshot(*(this->pedalboard.snapshots()[selectedSnapshot]), this->pluginHost); // no longer own it.
+        }
+        SetPresetChanged(-1, true, false);
+        this->pedalboard.selectedSnapshot(selectedSnapshot);
+        FirePedalboardChanged(-1, false);
+    }
+}
+
+void PiPedalModel::SetSnapshots(std::vector<std::shared_ptr<Snapshot>> &snapshots, int64_t selectedSnapshot)
+{
+    std::lock_guard<std::recursive_mutex> lock(mutex);
+
+    // notionally, snapshots are saved whenever they are modified, but pedalboards are not.
+    // so we must add the current snapshots BOTH to the current pedalbaoard, AND to the
+    // current saved instance of the pedalboard to create the illusion that the are stored separately.
+    // In practice, snapshots have to track structure changes (delete pedalboard items that have been deleted,
+    // and set default settings for pedalboard items that have ben added since the snapshots was last saved.
+    //
+    // This is acheived by:
+    // 1. updating BOTH the current pedalboard, and its saved instance.
+    // 2. discarding references to dangling instances as plugins are loaded (see UpdateDefaults).
+    // 3. Setting missing snapshot controls to default values (NOT the current pedalboard values)
+    // 4. (We currently don't do the right thing with patch properties if the patch property has never been set).
+
+    UpdateVst3Settings(pedalboard);
+
+    {
+        // stealth update of the saved snapshots.
+        auto savedPedalboard = storage.GetCurrentPreset();
+        savedPedalboard.snapshots(snapshots); // makes a shallow copy
+
+        if (selectedSnapshot != -1)
+        {
+            // implies that this is a snapshot of the currently running pedalboard. so we can mark it as the selected pedalboard.
+            this->pedalboard.selectedSnapshot(selectedSnapshot);
+        }
+        // UpdateDefaults(&savedPedalboard); // The update is awfully fresh. wait until it gets loaded again before pruning.
+        storage.SaveCurrentPreset(savedPedalboard);
+    }
+
+    this->pedalboard.snapshots(std::move(snapshots));
+    if (selectedSnapshot != -1)
+    {
+        this->pedalboard.selectedSnapshot(selectedSnapshot);
+    }
+
+    this->FirePedalboardChanged(-1, false); // notify clients (but don't change the running pedalboard, because it's still the same)
+                                            // this means that all clients get an up-to-date copy of the snapshots AND the currently selected snapshot if that applies
+                                            // (and a fresh copy of the pedalboard settings as well, which is harmless, since they have not changed)
+}
+
 void PiPedalModel::UpdateCurrentPedalboard(int64_t clientId, Pedalboard &pedalboard)
 {
     {
@@ -628,12 +690,60 @@ void PiPedalModel::GetBank(int64_t instanceId, BankFile *pResult)
     this->storage.GetBankFile(instanceId, pResult);
 }
 
-void PiPedalModel::SetPresetChanged(int64_t clientId, bool value)
+void PiPedalModel::SetPresetChanged(int64_t clientId, bool value, bool changeSnapshotSelect)
 {
+    if (changeSnapshotSelect && value && this->pedalboard.selectedSnapshot() != -1)
+    {
+        this->pedalboard.selectedSnapshot(-1);
+        FireSelectedSnapshotChanged(-1);
+    }
     if (value != this->hasPresetChanged)
     {
         hasPresetChanged = value;
-        FirePresetsChanged(clientId);
+        FirePresetChanged(value);
+    }
+}
+
+void PiPedalModel::FireSelectedSnapshotChanged(int64_t selectedSnapshot)
+{
+    std::lock_guard<std::recursive_mutex> guard{mutex};
+    {
+        // take a snapshot incase a client unsusbscribes in the notification handler (in which case the mutex won't protect us)
+        IPiPedalModelSubscriber **t = new IPiPedalModelSubscriber *[this->subscribers.size()];
+        for (size_t i = 0; i < subscribers.size(); ++i)
+        {
+            t[i] = this->subscribers[i];
+        }
+        size_t n = this->subscribers.size();
+
+        for (size_t i = 0; i < n; ++i)
+        {
+            t[i]->OnSelectedSnapshotChanged(selectedSnapshot);
+        }
+        delete[] t;
+    }
+}
+
+void PiPedalModel::FirePresetChanged(bool changed)
+{
+    std::lock_guard<std::recursive_mutex> guard{mutex};
+    {
+        // take a snapshot incase a client unsusbscribes in the notification handler (in which case the mutex won't protect us)
+        IPiPedalModelSubscriber **t = new IPiPedalModelSubscriber *[this->subscribers.size()];
+        for (size_t i = 0; i < subscribers.size(); ++i)
+        {
+            t[i] = this->subscribers[i];
+        }
+        size_t n = this->subscribers.size();
+
+        PresetIndex presets;
+        GetPresets(&presets);
+
+        for (size_t i = 0; i < n; ++i)
+        {
+            t[i]->OnPresetChanged(changed);
+        }
+        delete[] t;
     }
 }
 
@@ -776,12 +886,14 @@ int64_t PiPedalModel::UploadBank(BankFile &bankFile, int64_t uploadAfter)
     return newPreset;
 }
 
-void PiPedalModel::OnNotifyNextMidiProgram(const RealtimeNextMidiProgramRequest &request)
+void PiPedalModel::NextBank(Direction direction)
+{
+
+}
+void PiPedalModel::NextPreset(Direction direction)
 {
-    std::lock_guard<std::recursive_mutex> guard{mutex};
-    try
-    {
     PresetIndex index;
+
     storage.GetPresetIndex(&index);
     auto currentPresetId = storage.GetCurrentPresetId();
     size_t currentPresetIndex = 0;
@@ -796,9 +908,9 @@ void PiPedalModel::OnNotifyNextMidiProgram(const RealtimeNextMidiProgramRequest
     }
     if (index.presets().size() == 0)
     {
-            throw PiPedalException("No presets loaded.");
+        return;
     }
-        if (request.direction < 0)
+    if (direction == Direction::Decrease)
     {
         if (currentPresetIndex == 0)
         {
@@ -818,6 +930,21 @@ void PiPedalModel::OnNotifyNextMidiProgram(const RealtimeNextMidiProgramRequest
         }
     }
     LoadPreset(-1, index.presets()[currentPresetIndex].instanceId());
+}
+
+
+void PiPedalModel::OnNotifyNextMidiProgram(const RealtimeNextMidiProgramRequest &request)
+{
+    std::lock_guard<std::recursive_mutex> guard{mutex};
+    try
+    {
+
+        if (request.direction < 0)
+        {
+            NextPreset();
+        } else {
+            PreviousPreset();
+        }
     }
     catch (std::exception &e)
     {
@@ -994,8 +1121,6 @@ void PiPedalModel::SetWifiConfigSettings(const WifiConfigSettings &wifiConfigSet
 {
     std::lock_guard<std::recursive_mutex> lock(mutex);
 
-
-    
 #if NEW_WIFI_CONFIG
     if (this->storage.SetWifiConfigSettings(wifiConfigSettings))
     {
@@ -1065,7 +1190,7 @@ void PiPedalModel::UpdateDnsSd()
     std::string hostName = GetHostName();
     if (serviceName != "" && deviceIdFile.uuid != "")
     {
-        avahiService->Announce(webPort, serviceName, deviceIdFile.uuid, hostName,true);
+        avahiService->Announce(webPort, serviceName, deviceIdFile.uuid, hostName, true);
     }
     else
     {
@@ -1475,6 +1600,18 @@ void PiPedalModel::SendSetPatchProperty(
 
     std::lock_guard<std::recursive_mutex> lock(mutex);
 
+    // save the property to the preset (currently used to reconstruct snapshots only)
+    PedalboardItem *pedalboardItem = this->pedalboard.GetItem(instanceId);
+    if (pedalboardItem)
+    {
+        json_variant abstractPath = pluginHost.AbstractPath(value);
+        std::ostringstream ss;
+        json_writer writer(ss);
+        writer.write(abstractPath);
+        std::string atomString = ss.str();
+        pedalboardItem->pathProperties_[propertyUri] = atomString;
+    }
+    this->SetPresetChanged(clientId, true);
     LV2_Atom *atomValue = atomConverter.ToAtom(value);
 
     std::function<void(RealtimePatchPropertyRequest *)> onRequestComplete{
@@ -1727,11 +1864,19 @@ void PiPedalModel::SetJackServerSettings(const JackServerSettings &jackServerSet
 #endif
 }
 
-void PiPedalModel::UpdateDefaults(PedalboardItem *pedalboardItem)
+std::shared_ptr<Lv2PluginInfo> PiPedalModel::GetPluginInfo(const std::string &uri)
 {
+    return pluginHost.GetPluginInfo(uri);
+}
+
+void PiPedalModel::UpdateDefaults(PedalboardItem *pedalboardItem, std::unordered_map<int64_t, PedalboardItem *> &itemMap)
+{
+    itemMap[pedalboardItem->instanceId()] = pedalboardItem;
+
     std::shared_ptr<Lv2PluginInfo> pPlugin = pluginHost.GetPluginInfo(pedalboardItem->uri());
     if (!pPlugin)
     {
+        pedalboardItem->instanceId();
         if (pedalboardItem->uri() == SPLIT_PEDALBOARD_ITEM_URI)
         {
             pPlugin = GetSplitterPluginInfo();
@@ -1753,21 +1898,74 @@ void PiPedalModel::UpdateDefaults(PedalboardItem *pedalboardItem)
                 }
             }
         }
+        if (pPlugin->piPedalUI())
+        {
+            PiPedalUI::ptr piPedalUI = pPlugin->piPedalUI();
+            for (auto &fileProperty : piPedalUI->fileProperties())
+            {
+                if (!pedalboardItem->pathProperties_.contains(fileProperty->patchProperty()))
+                {
+                    // make sure each pedalboard item has a complete list of path properties, even if it doesn't yet have values.
+                    pedalboardItem->pathProperties_[fileProperty->patchProperty()] = "null";
+                }
+            }
+        }
+    }
+    else
+    {
+        // an old bug leaks lv2states.  Clean it up here.
+        if (pedalboardItem->uri() == EMPTY_PEDALBOARD_ITEM_URI)
+        {
+            pedalboardItem->lv2State(Lv2PluginState());
+        }
     }
     for (size_t i = 0; i < pedalboardItem->topChain().size(); ++i)
     {
-        UpdateDefaults(&(pedalboardItem->topChain()[i]));
+        UpdateDefaults(&(pedalboardItem->topChain()[i]), itemMap);
     }
     for (size_t i = 0; i < pedalboardItem->bottomChain().size(); ++i)
     {
-        UpdateDefaults(&(pedalboardItem->bottomChain()[i]));
+        UpdateDefaults(&(pedalboardItem->bottomChain()[i]), itemMap);
     }
 }
+
+void PiPedalModel::UpdateDefaults(Snapshot *snapshot, std::unordered_map<int64_t, PedalboardItem *> &itemMap)
+{
+    if (!snapshot)
+        return;
+    for (size_t i = 0; i < snapshot->values_.size(); ++i)
+    {
+        SnapshotValue &value = snapshot->values_[i];
+        auto f = itemMap.find(value.instanceId_);
+        if (f == itemMap.end())
+        {
+            // plugin is no longer present. Remove from the snapshot.
+            snapshot->values_.erase(snapshot->values_.begin() + i);
+            --i;
+        }
+        // missing values in snapshots get filled in with plugin defaults at load time,
+        // so we don't need to actually populate the missing values.
+    }
+    for (auto &snapshotValue : snapshot->values_)
+    {
+    }
+}
+
 void PiPedalModel::UpdateDefaults(Pedalboard *pedalboard)
 {
+    // add missing values.
+    std::unordered_map<int64_t, PedalboardItem *> itemMap;
     for (size_t i = 0; i < pedalboard->items().size(); ++i)
     {
-        UpdateDefaults(&(pedalboard->items()[i]));
+        UpdateDefaults(&(pedalboard->items()[i]), itemMap);
+    }
+    // set all missiong values on snapshots to default values.
+    for (auto snapshot : pedalboard->snapshots())
+    {
+        if (snapshot)
+        {
+            UpdateDefaults(snapshot.get(), itemMap);
+        }
     }
 }
 
@@ -1919,6 +2117,56 @@ void PiPedalModel::OnPatchSetReply(uint64_t instanceId, LV2_URID patchSetPropert
     audioHost->SetListenForAtomOutput(atomOutputListeners.size() != 0);
 }
 
+void PiPedalModel::OnNotifyPathPatchPropertyReceived(
+    int64_t instanceId,
+    LV2_URID pathPatchProperty,
+    LV2_Atom *pathProperty)
+{
+    std::lock_guard<std::recursive_mutex> lock(mutex);
+
+    std::string pathPatchPropertyUri = this->pluginHost.Lv2UridToString(pathPatchProperty);
+    std::string atomString = atomConverter.ToString(pathProperty);
+    auto pedalboardItem = this->pedalboard.GetItem(instanceId);
+
+    if (this->audioHost)
+    {
+        this->audioHost->OnNotifyPathPatchPropertyReceived(instanceId,pathPatchPropertyUri,atomString);
+    }
+
+
+
+
+    if (pedalboardItem == nullptr)
+    {
+        Lv2Log::error(SS("OnNotifyPathPatchPropertyReceived: " << pathPatchPropertyUri << " discarded."));
+        return; 
+    }
+    Lv2Log::error(SS("OnNotifyPathPatchPropertyReceived: " << pathPatchPropertyUri <<": " << atomString));
+
+    auto i = pedalboardItem->pathProperties_.find(pathPatchPropertyUri);
+    if (i != pedalboardItem->pathProperties_.end())
+    {
+        pedalboardItem->pathProperties_[pathPatchPropertyUri] = atomString;
+
+        std::vector<IPiPedalModelSubscriber *> t;
+        t.reserve(subscribers.size());
+
+        for (auto subscriber : subscribers)
+        {
+            t.push_back(subscriber);
+        }
+
+        for (auto subscriber : t)
+        {
+            subscriber->OnNotifyPathPatchPropertyChanged(
+                instanceId,
+                pathPatchPropertyUri,
+                atomString);
+        }
+
+    }
+}
+
 void PiPedalModel::OnNotifyMidiListen(bool isNote, uint8_t noteOrControl)
 {
     std::lock_guard<std::recursive_mutex> lock(mutex);
@@ -2169,6 +2417,15 @@ std::shared_ptr<Lv2Pedalboard> PiPedalModel::GetLv2Pedalboard()
 }
 bool PiPedalModel::LoadCurrentPedalboard()
 {
+    if (previousPedalboardLoaded && pedalboard.IsStructureIdentical(previousPedalboard))
+    {
+        // then we can send a snapshot update instead!
+        Snapshot snapshot = pedalboard.MakeSnapshotFromCurrentSettings(previousPedalboard);
+        audioHost->LoadSnapshot(snapshot,pluginHost);
+        this->previousPedalboard = this->pedalboard;
+        return true;
+    }
+
     Lv2PedalboardErrorList errorMessages;
     std::shared_ptr<Lv2Pedalboard> lv2Pedalboard{this->pluginHost.CreateLv2Pedalboard(this->pedalboard, errorMessages)};
     this->lv2Pedalboard = lv2Pedalboard;
@@ -2353,7 +2610,7 @@ void PiPedalModel::WaitForAudioDeviceToComeOnline()
     GetAlsaDevices();
 }
 
-PiPedalModel::PostHandle PiPedalModel::Post(PostCallback&&fn)
+PiPedalModel::PostHandle PiPedalModel::Post(PostCallback &&fn)
 {
     // I know. odd place to forward this to, but it's a very serviceable dispatcher implementation.
     // Why? because it's there, and PiPedalModel has no thread of its own to do dispatching.
@@ -2363,16 +2620,16 @@ PiPedalModel::PostHandle PiPedalModel::Post(PostCallback&&fn)
     }
     return hotspotManager->Post(std::move(fn));
 }
-PiPedalModel::PostHandle PiPedalModel::PostDelayed(const clock::duration&delay,PostCallback&&fn)
+PiPedalModel::PostHandle PiPedalModel::PostDelayed(const clock::duration &delay, PostCallback &&fn)
 {
     if (!hotspotManager)
     {
         throw std::runtime_error("Too early. It's not ready yet.");
     }
-    return hotspotManager->PostDelayed(delay,std::move(fn));
+    return hotspotManager->PostDelayed(delay, std::move(fn));
-
 }
-bool PiPedalModel::CancelPost(PostHandle handle) {
+bool PiPedalModel::CancelPost(PostHandle handle)
+{
     if (!hotspotManager)
     {
         throw std::runtime_error("Too early. It's not ready yet.");
@@ -2389,7 +2646,6 @@ void PiPedalModel::CancelNetworkChangingTimer()
     }
 }
 
-
 std::vector<std::string> PiPedalModel::GetKnownWifiNetworks()
 {
     if (!this->hotspotManager)
@@ -2399,16 +2655,16 @@ std::vector<std::string> PiPedalModel::GetKnownWifiNetworks()
     return this->hotspotManager->GetKnownWifiNetworks();
 }
 
-void PiPedalModel::OnNetworkChanging(bool ethernetConnected,bool hotspotConnected)
+void PiPedalModel::OnNetworkChanging(bool ethernetConnected, bool hotspotConnected)
 {
     CancelNetworkChangingTimer();
     this->networkChangingDelayHandle =
         PostDelayed(std::chrono::seconds(10), // takes a while for network configuration to be fully applied.
-        [this,ethernetConnected,hotspotConnected]() {
+                    [this, ethernetConnected, hotspotConnected]()
+                    {
                         this->networkChangingDelayHandle = 0;
-            OnNetworkChanged(ethernetConnected,hotspotConnected);
+                        OnNetworkChanged(ethernetConnected, hotspotConnected);
-        }
+                    });
-        );
 
     // take a snapshot incase a client unsusbscribes in the notification handler (in which case the mutex won't protect us)
     std::vector<IPiPedalModelSubscriber *> t;
@@ -2422,7 +2678,6 @@ void PiPedalModel::OnNetworkChanging(bool ethernetConnected,bool hotspotConnecte
     {
         t[i]->OnNetworkChanging(hotspotConnected);
     }
-
 }
 void PiPedalModel::OnNetworkChanged(bool ethernetConnected, bool hotspotConnected)
 {
@@ -2431,7 +2686,8 @@ void PiPedalModel::OnNetworkChanged(bool ethernetConnected, bool hotspotConnecte
 
 void PiPedalModel::OnNotifyMidiRealtimeEvent(RealtimeMidiEventType eventType)
 {
-    try {
+    try
+    {
         switch (eventType)
         {
         case RealtimeMidiEventType::Shutdown:
@@ -2466,7 +2722,8 @@ void PiPedalModel::OnNotifyMidiRealtimeEvent(RealtimeMidiEventType eventType)
         default:
             break;
         }
-    } catch (const std::exception&e)
+    }
+    catch (const std::exception &e)
     {
         Lv2Log::error(SS("Failed to process realtime MIDI event. " << e.what()));
     }
@@ -2507,3 +2764,5 @@ void PiPedalModel::RequestShutdown(bool restart)
         }
     }
 }
+
+

src/PiPedalModel.hpp

@@ -40,6 +40,7 @@
 #include "Promise.hpp"
 #include "AtomConverter.hpp"
 #include "FileEntry.hpp"
+#include <unordered_map>
 
 namespace pipedal
 {
@@ -58,11 +59,13 @@ namespace pipedal
         virtual void OnControlChanged(int64_t clientId, int64_t pedalItemId, const std::string &symbol, float value) = 0;
         virtual void OnInputVolumeChanged(float value) = 0;
         virtual void OnOutputVolumeChanged(float value) = 0;
-        virtual void OnUpdateStatusChanged(const UpdateStatus&updateStatus) = 0;
+        virtual void OnUpdateStatusChanged(const UpdateStatus &updateStatus) = 0;
-        virtual void OnLv2StateChanged(int64_t pedalItemId,const Lv2PluginState&newState ) = 0;
+        virtual void OnLv2StateChanged(int64_t pedalItemId, const Lv2PluginState &newState) = 0;
         virtual void OnVst3ControlChanged(int64_t clientId, int64_t pedalItemId, const std::string &symbol, float value, const std::string &state) = 0;
         virtual void OnPedalboardChanged(int64_t clientId, const Pedalboard &pedalboard) = 0;
         virtual void OnPresetsChanged(int64_t clientId, const PresetIndex &presets) = 0;
+        virtual void OnPresetChanged(bool changed) = 0;
+        virtual void OnSelectedSnapshotChanged(int64_t selectedSnapshot) = 0;
         virtual void OnPluginPresetsChanged(const std::string &pluginUri) = 0;
         virtual void OnChannelSelectionChanged(int64_t clientId, const JackChannelSelection &channelSelection) = 0;
         virtual void OnVuMeterUpdate(const std::vector<VuUpdate> &updates) = 0;
@@ -78,10 +81,11 @@ namespace pipedal
         virtual void OnGovernorSettingsChanged(const std::string &governor) = 0;
         virtual void OnFavoritesChanged(const std::map<std::string, bool> &favorites) = 0;
         virtual void OnShowStatusMonitorChanged(bool show) = 0;
-        virtual void OnSystemMidiBindingsChanged(const std::vector<MidiBinding>&bindings) = 0;
+        virtual void OnSystemMidiBindingsChanged(const std::vector<MidiBinding> &bindings) = 0;
+        virtual void OnNotifyPathPatchPropertyChanged(int64_t instanceId, const std::string &pathPatchPropertyString, const std::string &atomString) = 0;
 
-        //virtual void OnPatchPropertyChanged(int64_t clientId, int64_t instanceId,const std::string& propertyUri,const json_variant& value) = 0;
+        // virtual void OnPatchPropertyChanged(int64_t clientId, int64_t instanceId,const std::string& propertyUri,const json_variant& value) = 0;
-        virtual void OnErrorMessage(const std::string&message) = 0;
+        virtual void OnErrorMessage(const std::string &message) = 0;
         virtual void OnLv2PluginsChanging() = 0;
         virtual void OnNetworkChanging(bool hotspotConnected) = 0;
         virtual void Close() = 0;
@@ -98,13 +102,12 @@ namespace pipedal
         using PostCallback = std::function<void()>;
         using NetworkChangedListener = std::function<void(void)>;
 
-
     private:
         std::unique_ptr<HotspotManager> hotspotManager;
 
         std::unique_ptr<Updater> updater;
         UpdateStatus currentUpdateStatus;
-        void OnUpdateStatusChanged(const UpdateStatus&updateStatus);
+        void OnUpdateStatusChanged(const UpdateStatus &updateStatus);
         std::function<void(void)> restartListener;
 
         std::unique_ptr<Lv2PluginChangeMonitor> pluginChangeMonitor;
@@ -131,8 +134,10 @@ namespace pipedal
         class AtomOutputListener
         {
         public:
-            bool WantsProperty(uint64_t instanceId,LV2_URID patchProperty) const {
+            bool WantsProperty(uint64_t instanceId, LV2_URID patchProperty) const
-                if (instanceId != this->instanceId) return false;
+            {
+                if (instanceId != this->instanceId)
+                    return false;
                 return this->propertyUrid == 0 || patchProperty == this->propertyUrid;
             }
             int64_t clientId;
@@ -151,11 +156,14 @@ namespace pipedal
         AtomConverter atomConverter; // must be AFTER pluginHost!
 
         Pedalboard pedalboard;
+        bool previousPedalboardLoaded = false;
+        Pedalboard previousPedalboard;
         Storage storage;
         bool hasPresetChanged = false;
 
         NetworkChangedListener networkChangedListener;
-        void FireNetworkChanged() {
+        void FireNetworkChanged()
+        {
             if (networkChangedListener)
             {
                 networkChangedListener();
@@ -168,15 +176,18 @@ namespace pipedal
         std::filesystem::path webRoot;
 
         std::vector<IPiPedalModelSubscriber *> subscribers;
-        void SetPresetChanged(int64_t clientId, bool value);
+        void SetPresetChanged(int64_t clientId, bool value, bool changeSnapshotSelect = true);
+        void FireSelectedSnapshotChanged(int64_t selectedSnapshot);
         void FirePresetsChanged(int64_t clientId);
+        void FirePresetChanged(bool changed);
         void FirePluginPresetsChanged(const std::string &pluginUri);
         void FirePedalboardChanged(int64_t clientId, bool reloadAudioThread = true);
         void FireChannelSelectionChanged(int64_t clientId);
         void FireBanksChanged(int64_t clientId);
         void FireJackConfigurationChanged(const JackConfiguration &jackConfiguration);
 
-        void UpdateDefaults(PedalboardItem *pedalboardItem);
+        void UpdateDefaults(Snapshot *snapshot, std::unordered_map<int64_t, PedalboardItem *> &itemMap);
+        void UpdateDefaults(PedalboardItem *pedalboardItem, std::unordered_map<int64_t, PedalboardItem *> &itemMap);
         void UpdateDefaults(Pedalboard *pedalboard);
         class VuSubscription
         {
@@ -206,22 +217,22 @@ namespace pipedal
         virtual void OnNotifyMonitorPort(const MonitorPortUpdate &update) override;
         virtual void OnNotifyMidiValueChanged(int64_t instanceId, int portIndex, float value) override;
         virtual void OnNotifyMidiListen(bool isNote, uint8_t noteOrControl) override;
-        virtual void OnPatchSetReply(uint64_t instanceId, LV2_URID patchSetProperty, const LV2_Atom*atomValue) override;
+        virtual void OnPatchSetReply(uint64_t instanceId, LV2_URID patchSetProperty, const LV2_Atom *atomValue) override;
         virtual void OnNotifyMidiRealtimeEvent(RealtimeMidiEventType eventType) override;
 
-
+        void OnNotifyPathPatchPropertyReceived(
-        void OnNotifyPatchProperty(uint64_t instanceId, LV2_URID outputAtomProperty, const std::string &atomJson);
+            int64_t instanceId,
-
+            LV2_URID pathPatchProperty,
-
+            LV2_Atom *pathProperty) override;
 
         virtual void OnNotifyMidiProgramChange(RealtimeMidiProgramRequest &midiProgramRequest) override;
-        virtual void OnNotifyNextMidiProgram(const RealtimeNextMidiProgramRequest&request) override;
+        virtual void OnNotifyNextMidiProgram(const RealtimeNextMidiProgramRequest &request) override;
-        virtual void OnNotifyLv2RealtimeError(int64_t instanceId,const std::string &error) override;
+        virtual void OnNotifyLv2RealtimeError(int64_t instanceId, const std::string &error) override;
 
         PostHandle networkChangingDelayHandle = 0;
         void CancelNetworkChangingTimer();
 
-        void OnNetworkChanging(bool ethernetConnected,bool hotspotConnected);
+        void OnNetworkChanging(bool ethernetConnected, bool hotspotConnected);
         void OnNetworkChanged(bool ethernetConnected, bool hotspotConnected);
 
         void UpdateVst3Settings(Pedalboard &pedalboard);
@@ -229,25 +240,39 @@ namespace pipedal
         PiPedalConfiguration configuration;
 
         void CheckForResourceInitialization(Pedalboard &pedalboard);
+
     public:
         PiPedalModel();
         virtual ~PiPedalModel();
 
+        enum class Direction
+        {
+            Increase,
+            Decrease
+        };
+        void NextBank(Direction direction = Direction::Increase);
+        void PreviousBank() { NextBank(Direction::Decrease); }
+        void NextPreset(Direction direction = Direction::Increase);
+        void PreviousPreset() { NextPreset(Direction::Decrease); }
+
         void RequestShutdown(bool restart);
 
-        virtual PostHandle Post(PostCallback&&fn);
+        virtual PostHandle Post(PostCallback &&fn);
-        virtual PostHandle PostDelayed(const clock::duration&delay,PostCallback&&fn);
+        virtual PostHandle PostDelayed(const clock::duration &delay, PostCallback &&fn);
         virtual bool CancelPost(PostHandle handle);
 
-        template<class REP,class PERIOD> 
+        template <class REP, class PERIOD>
-        PostHandle PostDelayed(const std::chrono::duration<REP,PERIOD>&delay,PostCallback&&fn)
+        PostHandle PostDelayed(const std::chrono::duration<REP, PERIOD> &delay, PostCallback &&fn)
         {
             return PostDelayed(
-                std::chrono::duration_cast<clock::duration,REP,PERIOD>(delay),
+                std::chrono::duration_cast<clock::duration, REP, PERIOD>(delay),
                 std::move(fn));
         }
 
-        void SetNetworkChangedListener(NetworkChangedListener listener) {
+        std::shared_ptr<Lv2PluginInfo> GetPluginInfo(const std::string &uri);
+
+        void SetNetworkChangedListener(NetworkChangedListener listener)
+        {
             networkChangedListener = listener;
         }
 
@@ -256,8 +281,8 @@ namespace pipedal
         void WaitForAudioDeviceToComeOnline();
 
         UpdateStatus GetUpdateStatus();
-        void UpdateNow(const std::string&updateUrl);
+        void UpdateNow(const std::string &updateUrl);
-        void FireUpdateStatusChanged(const UpdateStatus&updateStatus);
+        void FireUpdateStatusChanged(const UpdateStatus &updateStatus);
         uint16_t GetWebPort() const { return webPort; }
         std::filesystem::path GetPluginUploadDirectory() const;
         void Close();
@@ -298,14 +323,15 @@ namespace pipedal
         void PreviewInputVolume(float value);
         void PreviewOutputVolume(float value);
 
-
-
         void SetPedalboard(int64_t clientId, Pedalboard &pedalboard);
-        Pedalboard&GetPedalboard();
+        Pedalboard &GetPedalboard();
         std::shared_ptr<Lv2Pedalboard> GetLv2Pedalboard();
 
         void UpdateCurrentPedalboard(int64_t clientId, Pedalboard &pedalboard);
 
+        void SetSnapshots(std::vector<std::shared_ptr<Snapshot>> &snapshots, int64_t selectedSnapshot);
+        void SetSnapshot(int64_t selectedSnapshot);
+
         void GetPresets(PresetIndex *pResult);
 
         Pedalboard GetPreset(int64_t instanceId);
@@ -369,11 +395,10 @@ namespace pipedal
             int64_t clientId,
             int64_t instanceId,
             const std::string uri,
-            const json_variant&value,
+            const json_variant &value,
             std::function<void()> onSuccess,
             std::function<void(const std::string &error)> onError);
 
-
         BankIndex GetBankIndex() const;
         void RenameBank(int64_t clientId, int64_t bankId, const std::string &newName);
         int64_t SaveBankAs(int64_t clientId, int64_t bankId, const std::string &newName);
@@ -389,7 +414,7 @@ namespace pipedal
         void ListenForMidiEvent(int64_t clientId, int64_t clientHandle, bool listenForControlsOnly);
         void CancelListenForMidiEvent(int64_t clientId, int64_t clientHandle);
 
-        void MonitorPatchProperty(int64_t clientId, int64_t clientHandle, uint64_t instanceId,const std::string&propertyUri);
+        void MonitorPatchProperty(int64_t clientId, int64_t clientHandle, uint64_t instanceId, const std::string &propertyUri);
         void CancelMonitorPatchProperty(int64_t clientId, int64_t clientHandle);
 
         std::vector<AlsaDeviceInfo> GetAlsaDevices();
@@ -399,15 +424,15 @@ namespace pipedal
         void SetFavorites(const std::map<std::string, bool> &favorites);
         void SetUpdatePolicy(UpdatePolicyT updatePolicy);
         void ForceUpdateCheck();
-        std::vector<std::string> GetFileList(const UiFileProperty&fileProperty);
+        std::vector<std::string> GetFileList(const UiFileProperty &fileProperty);
-        std::vector<FileEntry> GetFileList2(const std::string &relativePath,const UiFileProperty&fileProperty);
+        std::vector<FileEntry> GetFileList2(const std::string &relativePath, const UiFileProperty &fileProperty);
 
         void DeleteSampleFile(const std::filesystem::path &fileName);
-        std::string CreateNewSampleDirectory(const std::string&relativePath, const UiFileProperty&uiFileProperty);
+        std::string CreateNewSampleDirectory(const std::string &relativePath, const UiFileProperty &uiFileProperty);
-        std::string RenameFilePropertyFile(const std::string&oldRelativePath,const std::string&newRelativePath,const UiFileProperty&uiFileProperty);
+        std::string RenameFilePropertyFile(const std::string &oldRelativePath, const std::string &newRelativePath, const UiFileProperty &uiFileProperty);
-        FilePropertyDirectoryTree::ptr GetFilePropertydirectoryTree(const UiFileProperty&uiFileProperty);
+        FilePropertyDirectoryTree::ptr GetFilePropertydirectoryTree(const UiFileProperty &uiFileProperty);
 
-        std::string UploadUserFile(const std::string &directory, const std::string &patchProperty,const std::string&filename,std::istream&inputStream,size_t streamLength);
+        std::string UploadUserFile(const std::string &directory, const std::string &patchProperty, const std::string &filename, std::istream &inputStream, size_t streamLength);
         uint64_t CreateNewPreset();
 
         bool LoadCurrentPedalboard();

src/PiPedalSocket.cpp

@@ -46,8 +46,23 @@
 using namespace std;
 using namespace pipedal;
 
+class PathPatchPropertyChangedBody
+{
+public:
+    int64_t instanceId_;
+    std::string propertyUri_;
+    std::string atomJson_;
+    DECLARE_JSON_MAP(PathPatchPropertyChangedBody);
+};
+JSON_MAP_BEGIN(PathPatchPropertyChangedBody)
+JSON_MAP_REFERENCE(PathPatchPropertyChangedBody, instanceId)
+JSON_MAP_REFERENCE(PathPatchPropertyChangedBody, propertyUri)
+JSON_MAP_REFERENCE(PathPatchPropertyChangedBody, atomJson)
+JSON_MAP_END()
 
-class GetPatchPropertyBody {
+
+class GetPatchPropertyBody
+{
 public:
     uint64_t instanceId_;
     std::string propertyUri_;
@@ -59,8 +74,8 @@ JSON_MAP_REFERENCE(GetPatchPropertyBody, instanceId)
 JSON_MAP_REFERENCE(GetPatchPropertyBody, propertyUri)
 JSON_MAP_END()
 
-
+class CreateNewSampleDirectoryArgs
-class CreateNewSampleDirectoryArgs {
+{
 public:
     std::string relativePath_;
     UiFileProperty uiFileProperty_;
@@ -72,7 +87,8 @@ JSON_MAP_REFERENCE(CreateNewSampleDirectoryArgs, relativePath)
 JSON_MAP_REFERENCE(CreateNewSampleDirectoryArgs, uiFileProperty)
 JSON_MAP_END()
 
-class RenameSampleFileArgs {
+class RenameSampleFileArgs
+{
 public:
     std::string oldRelativePath_;
     std::string newRelativePath_;
@@ -86,8 +102,8 @@ JSON_MAP_REFERENCE(RenameSampleFileArgs, newRelativePath)
 JSON_MAP_REFERENCE(RenameSampleFileArgs, uiFileProperty)
 JSON_MAP_END()
 
-
+class Lv2StateChangedBody
-class Lv2StateChangedBody {
+{
 public:
     uint64_t instanceId_;
     Lv2PluginState state_;
@@ -99,9 +115,8 @@ JSON_MAP_REFERENCE(Lv2StateChangedBody, instanceId)
 JSON_MAP_REFERENCE(Lv2StateChangedBody, state)
 JSON_MAP_END()
 
-
+class SetPatchPropertyBody
-
+{
-class SetPatchPropertyBody {
 public:
     uint64_t instanceId_;
     std::string propertyUri_;
@@ -171,7 +186,7 @@ public:
 JSON_MAP_BEGIN(MonitorPatchPropertyBody)
 JSON_MAP_REFERENCE(MonitorPatchPropertyBody, instanceId)
 JSON_MAP_REFERENCE(MonitorPatchPropertyBody, clientHandle)
-JSON_MAP_REFERENCE(MonitorPatchPropertyBody,propertyUri)
+JSON_MAP_REFERENCE(MonitorPatchPropertyBody, propertyUri)
 JSON_MAP_END()
 
 class OnLoadPluginPresetBody
@@ -240,9 +255,6 @@ JSON_MAP_REFERENCE(FileRequestArgs, relativePath)
 JSON_MAP_REFERENCE(FileRequestArgs, fileProperty)
 JSON_MAP_END()
 
-
-
-
 class MonitorPortBody
 {
 public:
@@ -370,6 +382,20 @@ JSON_MAP_REFERENCE(UpdateCurrentPedalboardBody, clientId)
 JSON_MAP_REFERENCE(UpdateCurrentPedalboardBody, pedalboard)
 JSON_MAP_END()
 
+class SetSnapshotsBody
+{
+public:
+    std::vector<std::shared_ptr<Snapshot>> snapshots_;
+    int64_t selectedSnapshot_;
+
+    DECLARE_JSON_MAP(SetSnapshotsBody);
+};
+
+JSON_MAP_BEGIN(SetSnapshotsBody)
+JSON_MAP_REFERENCE(SetSnapshotsBody, snapshots)
+JSON_MAP_REFERENCE(SetSnapshotsBody, selectedSnapshot)
+JSON_MAP_END()
+
 class ChannelSelectionChangedBody
 {
 public:
@@ -451,7 +477,6 @@ JSON_MAP_REFERENCE(Vst3ControlChangedBody, value)
 JSON_MAP_REFERENCE(Vst3ControlChangedBody, state)
 JSON_MAP_END()
 
-
 class PiPedalSocketHandler : public SocketHandler, public IPiPedalModelSubscriber
 {
 private:
@@ -480,25 +505,25 @@ private:
         PortMonitorSubscription(
             int64_t subscriptionHandle,
             int64_t instanceId,
-            const std::string& key)
+            const std::string &key)
-        :subscriptionHandle(subscriptionHandle),
+            : subscriptionHandle(subscriptionHandle),
               instanceId(instanceId),
               key(key)
         {
-
         }
-        ~PortMonitorSubscription() {
+        ~PortMonitorSubscription()
+        {
             Close();
         }
         PortMonitorSubscription() {}
-        PortMonitorSubscription(const PortMonitorSubscription&) = delete;
+        PortMonitorSubscription(const PortMonitorSubscription &) = delete;
-        PortMonitorSubscription& operator=(const PortMonitorSubscription&) = delete;
+        PortMonitorSubscription &operator=(const PortMonitorSubscription &) = delete;
-        void Close() {
+        void Close()
-            std::lock_guard lock {pmMutex};
+        {
+            std::lock_guard lock{pmMutex};
             closed = true;
         }
 
-
         std::mutex pmMutex;
 
         bool closed = false;
@@ -532,7 +557,8 @@ public:
     bool finalCleanup = false;
     void FinalCleanup()
     {
-        if (finalCleanup) return;
+        if (finalCleanup)
+            return;
         finalCleanup = true;
         // avoid use after free.
         for (int i = 0; i < this->activePortMonitors.size(); ++i)
@@ -547,12 +573,12 @@ public:
         activeVuSubscriptions.resize(0);
 
         model.RemoveNotificationSubsription(this);
-
     }
 
     virtual void Close()
     {
-        if (closed) return;
+        if (closed)
+            return;
         closed = true;
 
         FinalCleanup(); // do it while we can.  &model will no longer be valid after this. ( :-( )
@@ -566,7 +592,8 @@ public:
         std::stringstream imageList;
         const std::filesystem::path &webRoot = model.GetWebRoot() / "img";
         bool firstTime = true;
-        try {
+        try
+        {
             for (const auto &entry : std::filesystem::directory_iterator(webRoot))
             {
                 if (!firstTime)
@@ -576,7 +603,8 @@ public:
                 firstTime = false;
                 imageList << entry.path().filename().string();
             }
-        } catch (const std::exception&)
+        }
+        catch (const std::exception &)
         {
             Lv2Log::error("Can't list files in %s. Image files will not be pre-loaded in the client.", webRoot.c_str());
         }
@@ -814,7 +842,7 @@ public:
     {
         std::shared_ptr<PortMonitorSubscription> result;
         {
-            std::lock_guard lock (activePortMonitorsMutex);
+            std::lock_guard lock(activePortMonitorsMutex);
 
             for (int i = 0; i < this->activePortMonitors.size(); ++i)
             {
@@ -832,8 +860,9 @@ public:
     {
         // running on RT_output thread, or on Socket thread.
         {
-            std::lock_guard lock {subscription->pmMutex};
+            std::lock_guard lock{subscription->pmMutex};
-            if (subscription->closed) return;
+            if (subscription->closed)
+                return;
             if (value == subscription->currentValue)
                 return;
             if (subscription->waitingForAck)
@@ -846,7 +875,7 @@ public:
             subscription->lastValue = value;
             subscription->waitingForAck = true;
         }
-        SendMonitorPortMessage_Inner(subscription,value);
+        SendMonitorPortMessage_Inner(subscription, value);
     }
 
     // post-sync send.
@@ -863,12 +892,14 @@ public:
             {
                 // running on PiPedalSocket thread.
                 std::shared_ptr<PortMonitorSubscription> subscription = getPortMonitorSubscription(subscriptionHandle_);
-                if (!subscription) return;
+                if (!subscription)
+                    return;
 
                 float value;
                 {
-                    std::unique_lock lock {subscription->pmMutex};
+                    std::unique_lock lock{subscription->pmMutex};
-                    if (subscription->closed) return;
+                    if (subscription->closed)
+                        return;
                     if (subscription->pendingValue)
                     {
                         value = subscription->currentValue;
@@ -892,7 +923,7 @@ public:
                 Lv2Log::debug("Failed to monitor port output. (%s)", e.what());
             });
     }
-    void MonitorPort(int replyTo,MonitorPortBody &body)
+    void MonitorPort(int replyTo, MonitorPortBody &body)
     {
         std::lock_guard<std::recursive_mutex> guard(subscriptionMutex);
         int64_t subscriptionHandle = model.MonitorPort(
@@ -971,7 +1002,8 @@ public:
             ControlChangedBody message;
             pReader->read(&message);
             this->model.PreviewControl(message.clientId_, message.instanceId_, message.symbol_, message.value_);
-        } else if (message == "setControl")
+        }
+        else if (message == "setControl")
         {
             ControlChangedBody message;
             pReader->read(&message);
@@ -1029,7 +1061,7 @@ public:
         else if (message == "getUpdateStatus")
         {
             UpdateStatus updateStatus = model.GetUpdateStatus();
-            this->Reply(replyTo,"getUpdateStatus",updateStatus);
+            this->Reply(replyTo, "getUpdateStatus", updateStatus);
         }
         else if (message == "updateNow")
         {
@@ -1037,7 +1069,7 @@ public:
             pReader->read(&updateUrl);
             model.UpdateNow(updateUrl);
             bool result = true;
-            this->Reply(replyTo,"updateNow",result);
+            this->Reply(replyTo, "updateNow", result);
         }
         else if (message == "getJackStatus")
         {
@@ -1053,7 +1085,6 @@ public:
         {
             std::vector<std::string> channels = this->model.GetKnownWifiNetworks();
             this->Reply(replyTo, "getWifiChannels", channels);
-
         }
         else if (message == "getWifiChannels")
         {
@@ -1199,6 +1230,18 @@ public:
                 this->model.UpdateCurrentPedalboard(body.clientId_, body.pedalboard_);
             }
         }
+        else if (message == "setSnapshot")
+        {
+            int64_t snapshotIndex = -1;
+            pReader->read(&snapshotIndex);
+            this->model.SetSnapshot(snapshotIndex);
+        }
+        else if (message == "setSnapshots")
+        {
+            SetSnapshotsBody body;
+            pReader->read(&body);
+            this->model.SetSnapshots(body.snapshots_, body.selectedSnapshot_);
+        }
         else if (message == "currentPedalboard")
         {
             auto pedalboard = model.GetCurrentPedalboardCopy();
@@ -1347,6 +1390,23 @@ public:
                 this->SendError(replyTo, std::string(e.what()));
             }
         }
+        else if (message == "nextBank")
+        {
+            model.NextBank();
+        }
+        else if (message == "previousBank")
+        {
+            model.PreviousBank();
+        }
+        else if (message == "nextPreset")
+        {
+            model.NextPreset();
+        }
+        else if (message == "previousPreset")
+        {
+            model.PreviousPreset();
+        }
+
         else if (message == "renamePresetItem")
         {
             RenamePresetBody body;
@@ -1373,17 +1433,14 @@ public:
         {
             SetPatchPropertyBody body;
             pReader->read(&body);
-            model.SendSetPatchProperty(clientId,body.instanceId_,body.propertyUri_,body.value_,
+            model.SendSetPatchProperty(clientId, body.instanceId_, body.propertyUri_, body.value_, [this, replyTo]()
-                [this, replyTo] () {
+                                       {
                                            this->JsonReply(replyTo, "setPatchProperty", "true");
-
                                        },
-                [this, replyTo] (const std::string&error) {
+                                       [this, replyTo](const std::string &error)
+                                       {
                                            this->SendError(replyTo, error.c_str());
-
+                                       });
-                }
-            );
-
         }
 
         else if (message == "getPatchProperty")
@@ -1410,7 +1467,7 @@ public:
             MonitorPortBody body;
             pReader->read(&body);
 
-            MonitorPort(replyTo,body);
+            MonitorPort(replyTo, body);
         }
         else if (message == "unmonitorPort")
         {
@@ -1492,7 +1549,6 @@ public:
         else if (message == "forceUpdateCheck")
         {
             this->model.ForceUpdateCheck();
-
         }
         else if (message == "setSystemMidiBindings")
         {
@@ -1503,26 +1559,26 @@ public:
         else if (message == "getSystemMidiBindings")
         {
             std::vector<MidiBinding> bindings = this->model.GetSystemMidiBidings();
-            this->Reply(replyTo,"getSystemMidiBindings",bindings);
+            this->Reply(replyTo, "getSystemMidiBindings", bindings);
         }
         else if (message == "requestFileList")
         {
             UiFileProperty fileProperty;
             pReader->read(&fileProperty);
             std::vector<std::string> list = this->model.GetFileList(fileProperty);
-            this->Reply(replyTo,"requestFileList",list);
+            this->Reply(replyTo, "requestFileList", list);
         }
         else if (message == "requestFileList2")
         {
             FileRequestArgs requestArgs;
             pReader->read(&requestArgs);
             std::vector<FileEntry> list = this->model.GetFileList2(requestArgs.relativePath_, requestArgs.fileProperty_);
-            this->Reply(replyTo,"requestFileList2",list);
+            this->Reply(replyTo, "requestFileList2", list);
         }
         else if (message == "newPreset")
         {
             int64_t presetId = this->model.CreateNewPreset();
-            this->Reply(replyTo,"newPreset",presetId);
+            this->Reply(replyTo, "newPreset", presetId);
         }
         else if (message == "deleteUserFile")
         {
@@ -1530,29 +1586,30 @@ public:
             pReader->read(&fileName);
 
             this->model.DeleteSampleFile(fileName);
-            this->Reply(replyTo,"deleteUserFile",true);
+            this->Reply(replyTo, "deleteUserFile", true);
         }
         else if (message == "createNewSampleDirectory")
         {
             CreateNewSampleDirectoryArgs args;
             pReader->read(&args);
 
-            std::string newFileName = this->model.CreateNewSampleDirectory(args.relativePath_,args.uiFileProperty_);
+            std::string newFileName = this->model.CreateNewSampleDirectory(args.relativePath_, args.uiFileProperty_);
-            this->Reply(replyTo,"createNewSampleDirectory",newFileName);
+            this->Reply(replyTo, "createNewSampleDirectory", newFileName);
         }
         else if (message == "renameFilePropertyFile")
         {
             RenameSampleFileArgs args;
             pReader->read(&args);
 
-            std::string newFileName = this->model.RenameFilePropertyFile(args.oldRelativePath_,args.newRelativePath_,args.uiFileProperty_);
+            std::string newFileName = this->model.RenameFilePropertyFile(args.oldRelativePath_, args.newRelativePath_, args.uiFileProperty_);
-            this->Reply(replyTo,"renameFilePropertyFile",newFileName);
+            this->Reply(replyTo, "renameFilePropertyFile", newFileName);
-        } else if (message == "getFilePropertyDirectoryTree"){
+        }
+        else if (message == "getFilePropertyDirectoryTree")
+        {
             UiFileProperty uiFileProperty;
             pReader->read(&uiFileProperty);
             FilePropertyDirectoryTree::ptr result = model.GetFilePropertydirectoryTree(uiFileProperty);
-            this->Reply(replyTo,"GetFilePropertydirectoryTree",result);
+            this->Reply(replyTo, "GetFilePropertydirectoryTree", result);
-
         }
 
         else if (message == "setOnboarding")
@@ -1633,37 +1690,37 @@ protected:
     }
 
 private:
-    virtual void OnUpdateStatusChanged(const UpdateStatus&updateStatus) {
+    virtual void OnUpdateStatusChanged(const UpdateStatus &updateStatus)
-        Send("onUpdateStatusChanged",updateStatus);
+    {
+        Send("onUpdateStatusChanged", updateStatus);
     }
 
     virtual void OnLv2StateChanged(int64_t instanceId, const Lv2PluginState &state)
     {
-        Lv2StateChangedBody message { (uint64_t)instanceId, state};
+        Lv2StateChangedBody message{(uint64_t)instanceId, state};
-        Send("onLv2StateChanged",message);
+        Send("onLv2StateChanged", message);
-
     }
 
-    virtual void OnLv2PluginsChanging() override {
+    virtual void OnLv2PluginsChanging() override
-        Send("onLv2PluginsChanging",true);
+    {
+        Send("onLv2PluginsChanging", true);
         Flush();
     }
-    virtual void OnNetworkChanging(bool hotspotConnected) override {
+    virtual void OnNetworkChanging(bool hotspotConnected) override
-        try {
+    {
-            Send("onNetworkChanging",hotspotConnected);
+        try
+        {
+            Send("onNetworkChanging", hotspotConnected);
             Flush();
-
+        }
-        } catch (const std::exception&ignored)
+        catch (const std::exception &ignored)
         {
-
+        }
     }
 
-    }
+    virtual void OnErrorMessage(const std::string &message)
-
-
-    virtual void OnErrorMessage(const std::string&message)
     {
-        Send("onErrorMessage",message);
+        Send("onErrorMessage", message);
     }
     // virtual void OnPatchPropertyChanged(int64_t clientId, int64_t instanceId,const std::string& propertyUri,const json_variant& value)
     // {
@@ -1675,8 +1732,9 @@ private:
     //     Send("onPatchPropertyChanged",body);
     // }
 
-    virtual void OnSystemMidiBindingsChanged(const std::vector<MidiBinding>&bindings) {
+    virtual void OnSystemMidiBindingsChanged(const std::vector<MidiBinding> &bindings)
-        Send("onSystemMidiBindingsChanged",bindings);
+    {
+        Send("onSystemMidiBindingsChanged", bindings);
     }
 
     virtual void OnFavoritesChanged(const std::map<std::string, bool> &favorites)
@@ -1696,6 +1754,16 @@ private:
         body.jackChannelSelection_ = const_cast<JackChannelSelection *>(&channelSelection);
         Send("onChannelSelectionChanged", body);
     }
+    virtual void OnSelectedSnapshotChanged(int64_t selectedSnapshot) override
+    {
+        Send("onSelectedSnapshotChanged", selectedSnapshot);
+    }
+
+    virtual void OnPresetChanged(bool changed) override
+    {
+        Send("onPresetChanged", changed);
+    }
+
     virtual void OnPresetsChanged(int64_t clientId, const PresetIndex &presets)
     {
         PresetsChangedBody body;
@@ -1852,8 +1920,8 @@ private:
         }
     }
 
-    void Flush() {
+    void Flush()
-        
+    {
     }
     int outstandingNotifyAtomOutputs = 0;
 
@@ -1910,7 +1978,7 @@ private:
                     if (output.clientHandle == clientHandle && output.instanceId == instanceId && output.propertyUri == atomProperty)
                     {
                         // better to erase than overwrite, since it provides better idempotence.
-                        pendingNotifyAtomOutputs.erase(pendingNotifyAtomOutputs.begin()+i);
+                        pendingNotifyAtomOutputs.erase(pendingNotifyAtomOutputs.begin() + i);
                         break;
                     }
                 }
@@ -1930,6 +1998,16 @@ private:
 
             });
     }
+    virtual void OnNotifyPathPatchPropertyChanged(int64_t instanceId, const std::string &pathPatchPropertyString, const std::string &atomString)
+    {
+        PathPatchPropertyChangedBody body;
+        body.instanceId_ = instanceId;
+        body.propertyUri_ = pathPatchPropertyString;
+        body.atomJson_ = atomString;
+
+        Send("onNotifyPathPatchPropertyChanged", body);
+    }
+
     virtual void OnNotifyMidiListener(int64_t clientHandle, bool isNote, uint8_t noteOrControl)
     {
         NotifyMidiListenerBody body;
@@ -2014,4 +2092,3 @@ std::shared_ptr<ISocketFactory> pipedal::MakePiPedalSocketFactory(PiPedalModel &
 {
     return std::make_shared<PiPedalSocketFactory>(model);
 }
-

src/PluginHost.cpp

@@ -18,6 +18,7 @@
 // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include "pch.h"
+#include "AtomConverter.hpp"
 #include "PluginHost.hpp"
 #include <lilv/lilv.h>
 #include <stdexcept>
@@ -44,6 +45,7 @@
 #include <fstream>
 #include "PiPedalException.hpp"
 #include "StdErrorCapture.hpp"
+#include "util.hpp"
 
 #include "Locale.hpp"
 
@@ -188,6 +190,9 @@ void PluginHost::LilvUris::Initialize(LilvWorld *pWorld)
     patch__readable = lilv_new_uri(pWorld, LV2_PATCH__readable);
 
     dc__format = lilv_new_uri(pWorld, "http://purl.org/dc/terms/format");
+
+    mod__fileTypes = lilv_new_uri(pWorld,"http://moddevices.com/ns/mod#fileTypes");
+
 }
 
 void PluginHost::LilvUris::Free()
@@ -618,6 +623,20 @@ std::shared_ptr<PiPedalUI> Lv2PluginInfo::FindWritablePathProperties(PluginHost
                             std::make_shared<UiFileProperty>(
                                 strLabel, propertyUri.AsUri(), lv2DirectoryName);
 
+                        AutoLilvNodes mod__fileTypes = lilv_world_find_nodes(pWorld, propertyUri, lv2Host->lilvUris->mod__fileTypes, nullptr);
+                        LILV_FOREACH(nodes,i,mod__fileTypes)
+                        {
+                                // "nam,nammodel"
+                            AutoLilvNode lilvfileType  {lilv_nodes_get(mod__fileTypes, i)};
+                            std::string fileTypes = lilvfileType.AsString();
+
+                            for (std::string&type: split(fileTypes,','))
+                            {
+                                fileProperty->fileTypes().push_back(UiFileType(SS(type << " file"),SS('.' << type)));
+                            }
+                        }
+                        if (!mod__fileTypes)
+                        {
                             AutoLilvNodes dc_types = lilv_world_find_nodes(pWorld, propertyUri, lv2Host->lilvUris->dc__format, nullptr);
                             LILV_FOREACH(nodes, i, dc_types)
                             {
@@ -626,6 +645,7 @@ std::shared_ptr<PiPedalUI> Lv2PluginInfo::FindWritablePathProperties(PluginHost
                                 std::string label = "";
                                 fileProperty->fileTypes().push_back(UiFileType(label, fileType));
                             }
+                        }
 
                         fileProperties.push_back(
                             fileProperty);
@@ -1479,6 +1499,46 @@ void PluginHost::CheckForResourceInitialization(const std::string &pluginUri,con
     }
 }
 
+json_variant PluginHost::MapPath(const json_variant&json)
+{
+    AtomConverter converter(GetMapFeature());
+    return converter.MapPath(json,GetPluginStoragePath());
+
+}
+json_variant PluginHost::AbstractPath(const json_variant&json)
+{
+    AtomConverter converter(GetMapFeature());
+    return converter.AbstractPath(json,GetPluginStoragePath());
+
+}
+
+
+std::string PluginHost::MapPath(const std::string &abstractPath)
+{
+    auto storagePath = GetPluginStoragePath();
+    if (abstractPath.length() == 0)
+    {
+        return "";
+    }
+    return SS(storagePath << '/' << abstractPath);
+
+
+}
+std::string PluginHost::AbstractPath(const std::string&path)
+{
+    auto storagePath = GetPluginStoragePath();
+    if (path.starts_with(storagePath))
+    {
+        auto start = storagePath.length();
+        if (start < path.length() && path[start] == '/')
+        {
+            ++start;
+        }
+        return path.substr(start);
+    }
+    return path;
+}
+
 // void PiPedalHostLogError(const std::string &error)
 // {
 //     Lv2Log::error("%s",error.c_str());

src/PluginHost.hpp

@@ -729,6 +729,10 @@ namespace pipedal
             AutoLilvNode mod__label;
 
             AutoLilvNode dc__format;
+
+            AutoLilvNode mod__fileTypes;
+
+            
         };
         LilvUris* lilvUris = nullptr;
 
@@ -815,6 +819,12 @@ namespace pipedal
         void CheckForResourceInitialization(const std::string& pluginUri,const std::filesystem::path& pluginUploadDirectory);
         void ReloadPlugins();
 
+        // equivalent to LV2 MapPath AbstractPath features.
+        std::string MapPath(const std::string &abstractPath);
+        std::string AbstractPath(const std::string&path);
+        json_variant MapPath(const json_variant&json);
+        json_variant AbstractPath(const json_variant&json);
+
     private:
 
         std::set<std::string> pluginsThatHaveBeenCheckedForResources;

src/PresetBundle.cpp

@@ -0,0 +1,467 @@
+// Copyright (c) 2024 Robin Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#include "PresetBundle.hpp"
+#include "PiPedalModel.hpp"
+#include <vector>
+#include "Pedalboard.hpp"
+#include "Banks.hpp"
+#include "json.hpp"
+#include <sstream>
+#include "lv2/atom/atom.h"
+#include "ZipFile.hpp"
+#include <set>
+
+using namespace pipedal;
+
+static std::string ToString(const std::vector<uint8_t> &value)
+{
+    const char *start = (const char *)(&value[0]);
+    const char *end = start + value.size();
+    while (end != start && end[-1] == 0)
+    {
+        --end;
+    }
+
+    return std::string(start, end);
+}
+
+static std::vector<uint8_t> ToBinary(const std::string &value)
+{
+    std::vector<uint8_t> result(value.length() + 1);
+    for (size_t i = 0; i < value.length(); ++i)
+    {
+        result[i] = (uint8_t)value[i];
+    }
+    result[value.length()] = 0;
+    return result;
+}
+
+class PresetBundleWriterImpl : public PresetBundleWriter
+{
+public:
+    using self = PresetBundleWriterImpl;
+    using super = PresetBundleWriter;
+
+    PresetBundleWriterImpl()
+    {
+    }
+
+    void LoadPresets(PiPedalModel &model, const std::string &presetJson)
+    {
+        BankFile bankFile;
+
+        std::istringstream s(presetJson);
+        json_reader reader(s);
+
+        reader.read(&bankFile);
+        GatherMediaPaths(model, bankFile);
+        configFiles["bankFile.json"] = presetJson;
+
+        pluginUploadDirectory = model.GetPluginUploadDirectory();
+    }
+
+    void LoadPluginPresets(PiPedalModel &model, const std::string pluginPresetJson)
+    {
+        PluginPresets pluginPresets;
+
+        std::istringstream s(pluginPresetJson);
+        json_reader reader(s);
+
+        reader.read(&pluginPresets);
+
+        GatherMediaPaths(model, pluginPresets);
+        configFiles["pluginPresets.json"] = pluginPresetJson;
+
+        pluginUploadDirectory = model.GetPluginUploadDirectory();
+    }
+    virtual ~PresetBundleWriterImpl() noexcept;
+
+    virtual void WriteToFile(const std::filesystem::path &filePath) override;
+
+private:
+    void AddUsedPlugin(PiPedalModel &model, const std::string &pluginUri, const std::string &name);
+
+    void GatherMediaPaths(PiPedalModel &model, BankFile &bankFile);
+    void GatherMediaPaths(PiPedalModel &model, PluginPresets &pluginPreset);
+
+    std::map<std::string, std::string> configFiles;
+    std::set<std::string> mediaPaths;
+    std::set<std::string> usedPlugins;
+    std::vector<std::map<std::string, std::string>> pluginMetadata;
+
+    std::filesystem::path pluginUploadDirectory;
+};
+
+void PresetBundleWriterImpl::WriteToFile(const std::filesystem::path &filePath)
+{
+
+    ZipFileWriter::ptr zipFile = ZipFileWriter::Create(filePath);
+
+    for (const auto &configFile : configFiles)
+    {
+
+        zipFile->WriteFile(configFile.first, configFile.second.data(), configFile.second.size());
+    }
+    std::string metadata;
+    {
+        std::ostringstream ss;
+        json_writer writer(ss);
+        writer.write(this->pluginMetadata);
+        metadata = ss.str();
+        zipFile->WriteFile("pluginsUsed.json", metadata.data(), metadata.length());
+    }
+
+    for (const auto &mediaPath : mediaPaths)
+    {
+        std::string zipName = (std::filesystem::path("media") / std::filesystem::path(mediaPath)).string();
+        std::filesystem::path sourcePath = this->pluginUploadDirectory / std::filesystem::path(mediaPath);
+        if (std::filesystem::exists(sourcePath))
+        {
+            zipFile->WriteFile(zipName, sourcePath);
+        }
+        else
+        {
+            Lv2Log::warning(SS("Media file not found: " << sourcePath));
+        }
+    }
+    zipFile->Close();
+}
+
+void PresetBundleWriterImpl::GatherMediaPaths(PiPedalModel &model, BankFile &bankFile)
+{
+    for (auto &preset : bankFile.presets())
+    {
+        Pedalboard &pedalboard = preset->preset();
+        auto items = pedalboard.GetAllPlugins();
+        for (auto plugin : items)
+        {
+            AddUsedPlugin(model, plugin->uri(), plugin->pluginName());
+            const Lv2PluginState &state = plugin->lv2State();
+            for (const auto &value : state.values_)
+            {
+                if (value.second.atomType_ == LV2_ATOM__Path)
+                {
+                    std::string path = ToString(value.second.value_);
+                    if (!mediaPaths.contains(path))
+                    {
+                        mediaPaths.insert(std::move(path));
+                    }
+                }
+            }
+        }
+    }
+}
+void PresetBundleWriterImpl::GatherMediaPaths(PiPedalModel &model, PluginPresets &pluginPresets)
+{
+    AddUsedPlugin(model, pluginPresets.pluginUri_, "");
+
+    for (auto &preset : pluginPresets.presets_)
+    {
+        const Lv2PluginState &state = preset.state_;
+        for (const auto &value : state.values_)
+        {
+            if (value.second.atomType_ == LV2_ATOM__Path)
+            {
+                std::string path = ToString(value.second.value_);
+                if (!mediaPaths.contains(path))
+                {
+                    mediaPaths.insert(std::move(path));
+                }
+            }
+        }
+    }
+}
+
+PresetBundleWriter::ptr PresetBundleWriter::CreatePresetsFile(PiPedalModel &model, const std::string &presetJson)
+{
+    auto result = std::make_unique<PresetBundleWriterImpl>();
+    result->LoadPresets(model, presetJson);
+
+    return result;
+}
+PresetBundleWriter::ptr PresetBundleWriter::CreatePluginPresetsFile(PiPedalModel &model, const std::string &pluginPresetJson)
+{
+    auto result = std::make_unique<PresetBundleWriterImpl>();
+    result->LoadPluginPresets(model, pluginPresetJson);
+    return result;
+}
+
+class PresetBundleReaderImpl : public PresetBundleReader
+{
+public:
+    PresetBundleReaderImpl()
+    {
+    }
+
+    void LoadPresetsFile(PiPedalModel &model, const std::filesystem::path &path)
+    {
+        this->pluginUploadDirectory = model.GetPluginUploadDirectory();
+        zipFile = ZipFileReader::Create(path);
+        auto s = zipFile->GetFileInputStream("pluginPresets.json");
+        json_reader reader(s);
+        reader.read(&pluginPresets);
+    }
+    void LoadPluginPresetFile(PiPedalModel &model, const std::filesystem::path &path)
+    {
+        this->pluginUploadDirectory = model.GetPluginUploadDirectory();
+        zipFile = ZipFileReader::Create(path);
+        auto s = zipFile->GetFileInputStream("bankFile.json");
+        json_reader reader(s);
+        reader.read(&bankFile);
+    }
+    virtual ~PresetBundleReaderImpl() noexcept;
+
+    virtual void ExtractMediaFiles() override;
+    virtual std::string GetPresetJson() override;
+    virtual std::string GetPluginPresetsJson() override;
+
+private:
+    void ExtractMediaFile(const std::string &zipFileName);
+    bool IsSameFile(const std::string &zipFileName, const std::filesystem::path &filePath)
+    {
+        return zipFile->CompareFiles(zipFileName, filePath);
+    }
+    void RenameMediaFileProperty(const std::string oldName, const std::string &newName);
+
+    std::filesystem::path pluginUploadDirectory;
+    // BankFile bankFile;
+    ZipFileReader::ptr zipFile;
+
+    BankFile bankFile;
+    PluginPresets pluginPresets;
+};
+
+void PresetBundleReaderImpl::RenameMediaFileProperty(const std::string oldName, const std::string &newName)
+{
+    for (auto &preset : bankFile.presets())
+    {
+        Pedalboard &pedalboard = preset->preset();
+        auto items = pedalboard.GetAllPlugins();
+        for (auto plugin : items)
+        {
+            Lv2PluginState &state = plugin->lv2State();
+            for (auto &value : state.values_)
+            {
+                if (value.second.atomType_ == LV2_ATOM__Path)
+                {
+                    std::string path = ToString(value.second.value_);
+                    if (path == oldName)
+                    {
+                        state.values_.at(value.first).value_ = ToBinary(newName);
+                    }
+                }
+            }
+        }
+    }
+    for (auto preset : pluginPresets.presets_)
+    {
+        Lv2PluginState state = preset.state_;
+        for (auto &value : state.values_)
+        {
+            if (value.second.atomType_ == LV2_ATOM__Path)
+            {
+                std::string path = ToString(value.second.value_);
+                if (path == oldName)
+                {
+                    state.values_.at(value.first).value_ = ToBinary(newName);
+                }
+            }
+        }
+    }
+}
+
+PresetBundleReader::ptr PresetBundleReader::LoadPresetsFile(PiPedalModel &model, const std::filesystem::path &filePath)
+{
+    std::unique_ptr<PresetBundleReaderImpl> result = std::make_unique<PresetBundleReaderImpl>();
+    result->LoadPresetsFile(model, filePath);
+    return result;
+}
+PresetBundleReader::ptr PresetBundleReader::LoadPluginPresetsFile(PiPedalModel &model, const std::filesystem::path &filePath)
+{
+    std::unique_ptr<PresetBundleReaderImpl> result = std::make_unique<PresetBundleReaderImpl>();
+    result->LoadPluginPresetsFile(model, filePath);
+    return result;
+}
+
+void PresetBundleReaderImpl::ExtractMediaFiles()
+{
+    auto zipFiles = zipFile->GetFiles();
+    for (const auto &zipFile : zipFiles)
+    {
+        if (zipFile != "bankFile.json")
+        {
+            if (!zipFile.ends_with('/')) // don't process diretories.
+            {
+                ExtractMediaFile(zipFile);
+            }
+        }
+    }
+}
+
+static void ExtractFileVersion(std::string &baseName, int &n)
+{
+    if (baseName.ends_with(')'))
+    {
+        size_t endPos = baseName.length() - 1;
+        int startPos = baseName.find_last_of('(');
+        if (startPos != std::string::npos)
+        {
+            std::string number = baseName.substr(startPos + 1, endPos - (startPos + 1));
+            std::istringstream ss(number);
+            ss >> n;
+            if (!ss.fail())
+            {
+                while (startPos > 0 && baseName[startPos - 1] == ' ')
+                {
+                    --startPos;
+                }
+                baseName = baseName.substr(0, startPos);
+                return;
+            }
+        }
+    }
+    n = 0;
+}
+static std::filesystem::path NextFileName(const std::filesystem::path &fileName)
+{
+    int n = 0;
+    auto fileNameOnly = fileName.filename().string();
+    auto extPos = fileNameOnly.find_last_of('.');
+    if (extPos == std::string::npos)
+    {
+        extPos = fileNameOnly.length();
+    }
+    std::string baseName = fileNameOnly.substr(0, extPos);
+    ExtractFileVersion(baseName, n);
+    if (n >= 1024)
+    {
+        // something has gone badly wrong.
+        throw new std::runtime_error(SS("Can't increase the version number of " << fileName));
+    }
+    std::string newFileName = SS(baseName << "(" << (n + 1) << ')' << fileNameOnly.substr(extPos));
+    return fileName.parent_path() / newFileName;
+}
+void PresetBundleReaderImpl::ExtractMediaFile(const std::string &zipFileName)
+{
+    namespace fs = std::filesystem;
+    if (zipFileName.starts_with("media/"))
+    {
+        std::string baseName = zipFileName.substr(6);
+        fs::path targetFileName = this->pluginUploadDirectory / std::filesystem::path(baseName);
+        bool renamed = false;
+        while (true)
+        {
+            if (fs::exists(targetFileName))
+            {
+                if (IsSameFile(zipFileName, targetFileName))
+                {
+                    break;
+                }
+                else
+                {
+                    renamed = true;
+                    targetFileName = NextFileName(targetFileName);
+                }
+            }
+            else
+            {
+                zipFile->ExtractTo(zipFileName, targetFileName);
+                break;
+            }
+        }
+        if (renamed)
+        {
+            std::string newName = fs::path(baseName).parent_path() / targetFileName.filename();
+            RenameMediaFileProperty(baseName, newName);
+        }
+    }
+}
+
+std::string PresetBundleReaderImpl::GetPresetJson()
+{
+    std::ostringstream ss;
+    json_writer writer(ss);
+    writer.write(this->bankFile);
+    return ss.str();
+}
+
+std::string PresetBundleReaderImpl::GetPluginPresetsJson()
+{
+    std::ostringstream ss;
+    json_writer writer(ss);
+    writer.write(this->pluginPresets);
+    return ss.str();
+}
+
+PresetBundleReaderImpl::~PresetBundleReaderImpl() noexcept
+{
+}
+PresetBundleReader::~PresetBundleReader() noexcept
+{
+}
+
+PresetBundleWriterImpl::~PresetBundleWriterImpl() noexcept
+{
+}
+PresetBundleWriter::~PresetBundleWriter() noexcept
+{
+}
+
+class PluginMetadata
+{
+public:
+    PluginMetadata(std::shared_ptr<Lv2PluginInfo> &pluginInfo)
+    {
+        metadata_["uri"] = pluginInfo->uri();
+        metadata_["name"] = pluginInfo->name();
+        metadata_["brand"] = pluginInfo->brand();
+        metadata_["authorName"] = pluginInfo->author_name();
+        metadata_["authorHomePage"] = pluginInfo->author_homepage();
+    }
+    PluginMetadata(const std::string &uri, const std::string &name)
+    {
+        metadata_["uri"] = uri;
+        metadata_["name"] = name.empty() ? uri : name;
+    }
+
+    std::map<std::string, std::string> metadata_;
+};
+
+void PresetBundleWriterImpl::AddUsedPlugin(PiPedalModel &model, const std::string &pluginUri, const std::string &name)
+{
+    if (!usedPlugins.contains(pluginUri))
+    {
+        usedPlugins.insert(pluginUri);
+
+        auto pluginInfo = model.GetPluginInfo(pluginUri);
+
+        if (pluginInfo)
+        {
+            // use dictionaries because it's more version tolerant.
+            PluginMetadata metadata(pluginInfo);
+            this->pluginMetadata.push_back(std::move(metadata.metadata_));
+        }
+        else
+        {
+            PluginMetadata metadata(pluginUri, name);
+            this->pluginMetadata.push_back(std::move(metadata.metadata_));
+        }
+    }
+}

src/PresetBundle.hpp

@@ -0,0 +1,55 @@
+// Copyright (c) 2024 Robin Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#pragma once
+
+#include <string>
+
+namespace pipedal {
+    class PiPedalModel;
+
+    class PresetBundleWriter {
+    public:
+        using self = PresetBundleWriter;
+        using ptr = std::unique_ptr<self>;
+
+        virtual ~PresetBundleWriter() noexcept = 0;
+
+        virtual void WriteToFile(const std::filesystem::path&filePath) = 0;
+
+
+        static ptr CreatePresetsFile(PiPedalModel&model,const std::string&presetJson);
+        static ptr CreatePluginPresetsFile(PiPedalModel&model,const std::string&presetJson);
+    };
+
+    class PresetBundleReader {
+    public:
+        using self = PresetBundleReader;
+        using ptr = std::unique_ptr<self>;
+
+        virtual ~PresetBundleReader() noexcept = 0;
+
+        virtual void ExtractMediaFiles() = 0;
+        virtual std::string GetPresetJson() = 0;
+        virtual std::string GetPluginPresetsJson() = 0;
+        static ptr LoadPresetsFile(PiPedalModel&model,const std::filesystem::path &path);
+        static ptr LoadPluginPresetsFile(PiPedalModel&model,const std::filesystem::path &path);
+    };
+
+}

src/RingBufferReader.hpp

@@ -26,8 +26,12 @@
 #include "lv2/atom/atom.h"
 #include "RealtimeMidiEventType.hpp"
 #include <chrono>
+
+
+
 namespace pipedal
 {
+    class IndexedSnapshot;
 
     enum class RingBufferCommand : int64_t
     {
@@ -39,6 +43,10 @@ namespace pipedal
         AudioStopped,
         SetVuSubscriptions,
         FreeVuSubscriptions,
+
+        LoadSnapshot,
+        FreeSnapshot,
+
         SendVuUpdate,
         AckVuUpdate,
 
@@ -68,6 +76,8 @@ namespace pipedal
 
         RealtimeMidiEvent,
 
+        SendPathPropertyBuffer,
+
 
     };
 
@@ -449,6 +459,11 @@ namespace pipedal
         {
             write(RingBufferCommand::SetVuSubscriptions, configuration);
         }
+        void LoadSnapshot(IndexedSnapshot*snapshot)
+        {
+            write(RingBufferCommand::LoadSnapshot,snapshot);
+        }
+        
         void AckMidiProgramRequest(int64_t requestId)
         {
             write(RingBufferCommand::AckMidiProgramChange,requestId);
@@ -485,11 +500,20 @@ namespace pipedal
             write(RingBufferCommand::EffectReplaced, pedalboard);
         }
 
+        void FreeSnapshot(IndexedSnapshot*snapshot)
+        {
+            write(RingBufferCommand::FreeSnapshot,snapshot);
+        }
+
         void WriteLv2ErrorMessage(int64_t instanceId, const char*message)
         {
             size_t length = strlen(message);
             write(RingBufferCommand::Lv2ErrorMessage,instanceId,length,(uint8_t*)message);
         }
+        void SendPathPropertyBuffer(PatchPropertyWriter::Buffer*buffer)
+        {
+            write(RingBufferCommand::SendPathPropertyBuffer,buffer);
+        }
     };
 
     typedef RingBufferReader<true, false> RealtimeRingBufferReader;

src/SplitEffect.cpp

@@ -165,23 +165,55 @@ Lv2PluginInfo::ptr g_splitterPluginInfo = std::make_shared<Lv2PluginInfo>(makeSp
 
 Lv2PluginInfo::ptr pipedal::GetSplitterPluginInfo() { return g_splitterPluginInfo; }
 
+SplitEffect::SplitEffect(
+    uint64_t instanceId,
+    double sampleRate,
+    const std::vector<float *> &inputs)
+    : instanceId(instanceId), inputs(inputs), sampleRate(sampleRate)
+
+{
+    controlIndex["splitType"] = SPLIT_TYPE_CTL;
+    controlIndex["select"] = SELECT_CTL;
+    controlIndex["mix"] = MIX_CTL;
+    controlIndex["panL"] = PANL_CTL;
+    controlIndex["volL"]  = VOLL_CTL;
+    controlIndex["panR"] = PANR_CTL;
+    controlIndex["volR"] = VOLR_CTL;
+
+    Lv2PluginInfo::ptr puginInfo = g_splitterPluginInfo;
+
+    for (auto&port:  puginInfo->ports())
+    {   
+        if (port->is_control_port()  && port->is_input())
+        {
+            auto index = port->index();
+            if (index < defaultInputControlValues.size()) {
+                defaultInputControlValues[index] = port->default_value();
+            } 
+        }
+    } 
+}
+
+uint64_t SplitEffect::GetMaxInputControl() const  { return MAX_INPUT_CONTROL;}
+bool SplitEffect::IsInputControl(uint64_t index) const 
+{
+    return index >= 0 && index < MAX_INPUT_CONTROL;
+}
+float SplitEffect::GetDefaultInputControlValue(uint64_t index) const
+{
+    if (index < 0 || index >= MAX_INPUT_CONTROL) return 0;
+    return defaultInputControlValues[index];
+}
+
+
 int SplitEffect::GetControlIndex(const std::string &symbol) const
 {
-    if (symbol == "splitType")
+    auto i = controlIndex.find(symbol);
-        return SPLIT_TYPE_CTL;
+    if (i == controlIndex.end())
-    if (symbol == "select")
+    {
-        return SELECT_CTL;
-    if (symbol == "mix")
-        return MIX_CTL;
-    if (symbol == "panL")
-        return PANL_CTL;
-    if (symbol == "volL")
-        return VOLL_CTL;
-    if (symbol == "panR")
-        return PANR_CTL;
-    if (symbol == "volR")
-        return VOLR_CTL;
         return -1;
+    }
+    return i->second;
 }
 
 void SplitEffect::Activate()
@@ -344,6 +376,8 @@ float SplitEffect::GetControlValue(int portIndex) const
     }
 }
 
+
+
 void SplitEffect::SetControl(int index, float value)
 {
     switch (index)

src/SplitEffect.hpp

@@ -23,6 +23,8 @@
 #include "PiPedalException.hpp"
 #include "PiPedalMath.hpp"
 #include <assert.h>
+#include <string>
+#include <unordered_map>
 
 namespace pipedal
 {
@@ -75,6 +77,9 @@ namespace pipedal
 
         const double MIX_TRANSITION_TIME_S = 0.1;
         double sampleRate;
+
+        std::unordered_map<std::string,int> controlIndex;
+
         std::vector<float *> inputs;
         std::vector<float *> topInputs;
         std::vector<float *> bottomInputs;
@@ -111,6 +116,8 @@ namespace pipedal
         float blendDxLBottom = 0;
         float blendDxRBottom = 0;
 
+        std::vector<float> defaultInputControlValues;
+        
         int32_t blendFadeSamples;
 
         bool selectA = true;
@@ -288,27 +295,23 @@ namespace pipedal
             }
         }
         uint64_t instanceId;
+        virtual bool IsLv2Effect() const override { return true; }
 
         virtual uint8_t *GetAtomInputBuffer() { return nullptr; }
         virtual uint8_t *GetAtomOutputBuffer() { return nullptr; }
-        virtual void RequestPatchProperty(LV2_URID uridUri) {}
         virtual void GatherPatchProperties(RealtimePatchPropertyRequest *pRequest) {}
         virtual std::string AtomToJson(uint8_t *pAtom) { return ""; }
         virtual std::string GetAtomObjectType(uint8_t*pData) { return "not implemented";}
-        virtual bool GetLv2State(Lv2PluginState*state) { return false; }
+        virtual bool GetLv2State(Lv2PluginState*state) override { return false; }
+        virtual void SetLv2State(Lv2PluginState&state) override { }
         virtual bool HasErrorMessage() const { return false; }
         const char* TakeErrorMessage() { return ""; }
         virtual bool IsVst3() const { return false; }
-
     public:
         SplitEffect(
             uint64_t instanceId,
             double sampleRate,
-            const std::vector<float *> &inputs)
+            const std::vector<float *> &inputs);
-            : instanceId(instanceId), inputs(inputs), sampleRate(sampleRate)
-
-        {
-        }
         ~SplitEffect()
         {
         }
@@ -321,6 +324,12 @@ namespace pipedal
         static constexpr int VOLL_CTL = 4;
         static constexpr int PANR_CTL = 5;
         static constexpr int VOLR_CTL = 6;
+        static constexpr int MAX_INPUT_CONTROL =7;
+
+        virtual uint64_t GetMaxInputControl() const override;
+        virtual bool IsInputControl(uint64_t index) const override;
+        virtual float GetDefaultInputControlValue(uint64_t index) const override;
+
 
 
         virtual uint64_t GetInstanceId() const
@@ -356,7 +365,10 @@ namespace pipedal
             return GetControlValue(index);
         }
         virtual float GetControlValue(int portIndex) const;
-        virtual void SetControl(int index, float value);
+        virtual void SetControl(int index, float value) override;
+        virtual void SetPatchProperty(LV2_URID uridUri, size_t size, LV2_Atom *value) override {}
+        virtual void RequestPatchProperty(LV2_URID uridUri) {}
+        virtual void RequestAllPathPatchProperties() {}
 
 
         virtual int GetNumberOfOutputAudioPorts() const

src/Storage.cpp

@@ -352,7 +352,7 @@ void Storage::SavePluginPresetIndex()
             throw PiPedalException(SS("Can't write to " << path));
         }
 
-        json_writer writer(os, false);
+        json_writer writer(os, true);
         writer.write(this->pluginPresetIndex);
     }
 }
@@ -361,7 +361,7 @@ void Storage::SaveBankIndex()
 {
     pipedal::ofstream_synced os;
     os.open(GetIndexFileName(), std::ios_base::trunc);
-    json_writer writer(os, false);
+    json_writer writer(os, true);
     writer.write(this->bankIndex);
 }
 
@@ -436,7 +436,7 @@ void Storage::SaveBankFile(const std::string &name, const BankFile &bankFile)
     {
         pipedal::ofstream_synced s;
         s.open(fileName, std::ios_base::trunc);
-        json_writer writer(s, false);
+        json_writer writer(s, true);
         writer.write(bankFile);
         if (std::filesystem::exists(backupFile))
         {
@@ -722,7 +722,7 @@ void Storage::SaveChannelSelection()
     try
     {
         pipedal::ofstream_synced s(fileName);
-        json_writer writer(s, false);
+        json_writer writer(s, true);
         writer.write(this->jackChannelSelection);
     }
     catch (const std::exception &e)
@@ -911,7 +911,7 @@ int64_t Storage::UploadBank(BankFile &bankFile, int64_t uploadAfter)
     {
         throw PiPedalException("Can't write to bank file.");
     }
-    json_writer writer(f, false);
+    json_writer writer(f, true);
     writer.write(bankFile);
 
     lastBank = this->bankIndex.addBank(lastBank, bankFile.name());
@@ -933,7 +933,7 @@ void Storage::SaveUserSettings()
         {
             throw PiPedalException("Unable to write to " + ((std::string)path));
         }
-        json_writer writer(f, false);
+        json_writer writer(f, true);
         writer.write(userSettings);
     }
 }
@@ -1048,7 +1048,7 @@ void Storage::SaveCurrentPreset(const CurrentPreset &currentPreset)
         std::filesystem::path path = GetCurrentPresetPath();
 
         pipedal::ofstream_synced f(path);
-        json_writer writer(f, false);
+        json_writer writer(f, true);
         writer.write(currentPreset);
     }
     catch (std::exception &)
@@ -1128,7 +1128,7 @@ void Storage::SavePluginPresets(const std::string &pluginUri, const PluginPreset
         {
             throw PiPedalException(SS("Can't write to " << path));
         }
-        json_writer writer(os, false);
+        json_writer writer(os, true);
         writer.write(presets);
     }
     if (std::filesystem::exists(path))
@@ -1370,7 +1370,7 @@ void Storage::SetFavorites(const std::map<std::string, bool> &favorites)
     f.open(fileName);
     if (f.is_open())
     {
-        json_writer writer(f, false);
+        json_writer writer(f, true);
         writer.write(favorites);
     }
 }
@@ -1399,7 +1399,7 @@ void Storage::SetJackServerSettings(const pipedal::JackServerSettings &jackConfi
     f.open(fileName);
     if (f.is_open())
     {
-        json_writer writer(f, false);
+        json_writer writer(f, true);
         writer.write(jackConfiguration);
     }
 #if JACK_HOST
@@ -1414,7 +1414,7 @@ void Storage::SetSystemMidiBindings(const std::vector<MidiBinding> &bindings)
     f.open(fileName);
     if (f.is_open())
     {
-        json_writer writer(f, false);
+        json_writer writer(f, true);
         writer.write(bindings);
     }
 }

src/TemporaryFile.cpp

@@ -52,6 +52,9 @@ TemporaryFile::TemporaryFile(const std::filesystem::path&directory)
     this->path = filename;
 
 }
+void TemporaryFile::Detach() {
+    this->path.clear();
+}
 TemporaryFile::~TemporaryFile()
 {
     if (!path.empty())

src/TemporaryFile.hpp

@@ -22,10 +22,16 @@
 namespace pipedal {
     class TemporaryFile {
     public:
+        TemporaryFile() {}
         TemporaryFile(const TemporaryFile&) = delete;
         TemporaryFile&operator=(const TemporaryFile&) = delete;
 
+        TemporaryFile(TemporaryFile&&other) {
+            this->path = std::move(other.path);
+        }
         TemporaryFile(const std::filesystem::path&parentDirectory);
+
+        void Detach();
         ~TemporaryFile();
         const std::filesystem::path&Path()const { return path;}
         std::string str() const { return path.c_str(); }

src/Updater.cpp

@@ -376,17 +376,6 @@ GithubRelease::GithubRelease(json_variant &v)
 
 
 
-static std::vector<std::string> split(const std::string &s, char delimiter)
-{
-    std::vector<std::string> tokens;
-    std::string token;
-    std::istringstream tokenStream(s);
-    while (std::getline(tokenStream, token, delimiter))
-    {
-        tokens.push_back(token);
-    }
-    return tokens;
-}
 static std::string justTheVersion(const std::string &assetName)
 {
     // eg. pipedal_1.2.41_arm64.deb

src/WebServer.cpp

@@ -54,14 +54,17 @@
 using namespace pipedal;
 using namespace std;
 
-const bool ENABLE_KEEP_ALIVE = true;
+static const bool ENABLE_KEEP_ALIVE = true;
-const std::filesystem::path WEB_TEMP_DIR{"/var/pipedal/web_temp"};
+static const std::filesystem::path WEB_TEMP_DIR{"/var/pipedal/web_temp"};
 
 using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
 
 const size_t MAX_READ_SIZE = 512 * 1024 * 1024;
 ;
 using namespace boost;
+using namespace websocketpp::http;
+
+
 
 class request_with_file_upload : public websocketpp::http::parser::parser
 {
@@ -516,6 +519,7 @@ inline std::error_code request_with_file_upload::process(std::string::iterator b
 class CustomPpConfig : public websocketpp::config::asio
 {
 public:
+    using super = websocketpp::config::asio;
     typedef CustomPpConfig type;
     typedef websocketpp::config::asio base;
 
@@ -523,6 +527,7 @@ public:
     typedef pipedal_elog elog_type;
     typedef pipedal_alog alog_type;
 
+
     typedef request_with_file_upload request_type;
 
     struct transport_config : public base::transport_config
@@ -538,6 +543,8 @@ public:
 
     typedef websocketpp::transport::asio::endpoint<transport_config>
         transport_type;
+
+        typedef transport_type::transport_con_type x;
 };
 
 size_t CustomPpConfig::max_http_body_size = MAX_READ_SIZE;
@@ -693,8 +700,19 @@ namespace pipedal
                 ss << size;
                 request.replace_header(HttpField::content_length, ss.str());
             }
-            virtual void setBody(const std::string &body) { request.set_body(body); }
+            virtual void setBody(const std::string &body) override{ request.set_body(body); }
-            virtual void keepAlive(bool value)
+            virtual void setBodyFile(std::shared_ptr<TemporaryFile>&bodyFile) override { 
+                // cast away const to do what ther request would do if it had that method.
+
+                request.set_body_file(bodyFile->Path(),true);
+                bodyFile->Detach();
+            }
+            virtual void setBodyFile(std::filesystem::path&path, bool deleteWhenDone) override { 
+                // cast away const to do what ther request would do if it had that method.
+                request.set_body_file(path,deleteWhenDone);
+            }
+
+            virtual void keepAlive(bool value) override
             {
                 if ((!value) || (!ENABLE_KEEP_ALIVE))
                 {
@@ -1126,7 +1144,7 @@ namespace pipedal
 
                 Lv2Log::error("Failed to open session: %s", e.what());
             }
-            m_endpoint.close(hdl,websocketpp::close::status::abnormal_close, "");
+            //m_endpoint.close(hdl,websocketpp::close::status::abnormal_close, "");
         }
 
         void on_fail(connection_hdl hdl)

src/WebServer.hpp

@@ -12,6 +12,7 @@
 #include "Uri.hpp"
 #include <string_view>
 #include <filesystem>
+#include "TemporaryFile.hpp"
 
 
 
@@ -40,6 +41,9 @@ public:
     virtual void set(const std::string&key, const std::string&value) = 0;
     virtual void setContentLength(size_t size) = 0;
     virtual void setBody(const std::string&body) = 0;
+    virtual void setBodyFile(std::shared_ptr<TemporaryFile>&temporaryFile) = 0;
+    virtual void setBodyFile(std::filesystem::path&path, bool deleteWhenDone) = 0;
+
     virtual void  keepAlive(bool value)  = 0;
 };
 

src/WebServerConfig.cpp

@@ -30,24 +30,41 @@
 #include "PiPedalUI.hpp"
 #include "ofstream_synced.hpp"
 #include "UpdaterSecurity.hpp"
+#include "TemporaryFile.hpp"
+#include "PresetBundle.hpp"
 
 
+#define OLD_PRESET_EXTENSION ".piPreset"
 #define PRESET_EXTENSION ".piPreset"
-#define BANK_EXTENSION ".piBank"
+#define OLD_BANK_EXTENSION ".piBank"
+#define BANK_EXTENSION ".piBankBundle"
 #define PLUGIN_PRESETS_EXTENSION ".piPluginPresets"
 
+static const std::filesystem::path WEB_TEMP_DIR{"/var/pipedal/web_temp"};
+
+static const std::string PLUGIN_PRESETS_MIME_TYPE = "application/vnd.pipedal.pluginPresets";
+static const std::string PRESET_MIME_TYPE = "application/vnd.pipedal.preset";
+static const std::string BANK_MIME_TYPE = "application/vnd.pipedal.bank";
 
 using namespace pipedal;
 using namespace boost::system;
+namespace fs = std::filesystem;
+
+
+static bool IsZipFile(const std::filesystem::path &path)
+{
+    std::ifstream f(path);
+    if (!f.is_open()) return false;
+
+    char c[4];
+    memset(c,0,sizeof(c));
+
+    f >> c[0] >> c[1] >> c[2] >> c[3];
+
+    // official file header according to PKware documetnation.
+    return c[0] == 0x50 && c[1] == 0x4B && c[2] == 0x03 && c[3] == 0x04;
+
 
-static std::vector<std::string> split(const std::string& s, char delimiter) {
-    std::vector<std::string> tokens;
-    std::string token;
-    std::istringstream tokenStream(s);
-    while (std::getline(tokenStream, token, delimiter)) {
-        tokens.push_back(token);
-    }
-    return tokens;
 }
 
 class ExtensionChecker {
@@ -192,7 +209,14 @@ public:
                 std::string name;
                 std::string content;
                 GetPluginPresets(request_uri, &name, &content);
-                res.set(HttpField::content_type, "application/json");
+
+                TemporaryFile tmpFile { WEB_TEMP_DIR};
+                PresetBundleWriter::ptr presetbundleWriter  = PresetBundleWriter::CreatePluginPresetsFile(*(this->model),content);
+                presetbundleWriter->WriteToFile(tmpFile.Path());
+                size_t contentLength = std::filesystem::file_size(tmpFile.Path());
+
+
+                res.set(HttpField::content_type, PLUGIN_PRESETS_MIME_TYPE);
                 res.set(HttpField::cache_control, "no-cache");
                 res.setContentLength(content.length());
                 res.set(HttpField::content_disposition, GetContentDispositionHeader(name, PLUGIN_PRESETS_EXTENSION));
@@ -204,9 +228,14 @@ public:
                 std::string content;
                 GetPreset(request_uri, &name, &content);
 
-                res.set(HttpField::content_type, "application/json");
+                TemporaryFile tmpFile { WEB_TEMP_DIR};
+                PresetBundleWriter::ptr presetbundleWriter  = PresetBundleWriter::CreatePresetsFile(*(this->model),content);
+                presetbundleWriter->WriteToFile(tmpFile.Path());
+                size_t contentLength = std::filesystem::file_size(tmpFile.Path());
+
+                res.set(HttpField::content_type, PRESET_MIME_TYPE);
                 res.set(HttpField::cache_control, "no-cache");
-                res.setContentLength(content.length());
+                res.setContentLength(contentLength);
                 res.set(HttpField::content_disposition, GetContentDispositionHeader(name, PRESET_EXTENSION));
                 return;
             }
@@ -216,10 +245,18 @@ public:
                 std::string content;
                 GetBank(request_uri, &name, &content);
 
-                res.set(HttpField::content_type, "application/json");
+                TemporaryFile tmpFile { WEB_TEMP_DIR};
+                PresetBundleWriter::ptr presetbundleWriter  = PresetBundleWriter::CreatePresetsFile(*(this->model),content);
+                presetbundleWriter->WriteToFile(tmpFile.Path());
+                size_t contentLength = std::filesystem::file_size(tmpFile.Path());
+
+
+
+
+                res.set(HttpField::content_type, BANK_MIME_TYPE);
                 res.set(HttpField::cache_control, "no-cache");
                 res.set(HttpField::content_disposition, GetContentDispositionHeader(name, BANK_EXTENSION));
-                res.setContentLength(content.length());
+                res.setContentLength(contentLength);
                 return;
             }
             throw PiPedalException("Not found.");
@@ -252,11 +289,18 @@ public:
                 std::string name;
                 std::string content;
                 GetPluginPresets(request_uri, &name, &content);
-                res.set(HttpField::content_type, "application/json");
+
+                std::shared_ptr<TemporaryFile> tmpFile =std::make_shared<TemporaryFile>(WEB_TEMP_DIR);
+                PresetBundleWriter::ptr presetbundleWriter  = PresetBundleWriter::CreatePluginPresetsFile(*(this->model),content);
+                presetbundleWriter->WriteToFile(tmpFile->Path());
+                size_t contentLength = std::filesystem::file_size(tmpFile->Path());
+
+
+                res.set(HttpField::content_type, PLUGIN_PRESETS_MIME_TYPE);
                 res.set(HttpField::cache_control, "no-cache");
-                res.setContentLength(content.length());
+                res.setContentLength(contentLength);
                 res.set(HttpField::content_disposition, GetContentDispositionHeader(name, PLUGIN_PRESETS_EXTENSION));
-                res.setBody(content);
+                res.setBodyFile(tmpFile);
             }
             else if (segment == "downloadPreset")
             {
@@ -264,11 +308,17 @@ public:
                 std::string content;
                 GetPreset(request_uri, &name, &content);
 
-                res.set(HttpField::content_type, "application/json");
+                std::shared_ptr<TemporaryFile> tmpFile =std::make_shared<TemporaryFile>(WEB_TEMP_DIR);
+                PresetBundleWriter::ptr presetbundleWriter  = PresetBundleWriter::CreatePresetsFile(*(this->model),content);
+                presetbundleWriter->WriteToFile(tmpFile->Path());
+                size_t contentLength = std::filesystem::file_size(tmpFile->Path());
+
+
+                res.set(HttpField::content_type, PRESET_MIME_TYPE);
                 res.set(HttpField::cache_control, "no-cache");
-                res.setContentLength(content.length());
+                res.setContentLength(contentLength);
                 res.set(HttpField::content_disposition, GetContentDispositionHeader(name, PRESET_EXTENSION));
-                res.setBody(content);
+                res.setBodyFile(tmpFile);
             }
             else if (segment == "downloadBank")
             {
@@ -276,11 +326,18 @@ public:
                 std::string content;
                 GetBank(request_uri, &name, &content);
 
-                res.set(HttpField::content_type, "application/json");
+                std::shared_ptr<TemporaryFile> tmpFile =std::make_shared<TemporaryFile>(WEB_TEMP_DIR);
+                PresetBundleWriter::ptr presetbundleWriter  = PresetBundleWriter::CreatePresetsFile(*(this->model),content);
+                presetbundleWriter->WriteToFile(tmpFile->Path());
+                size_t contentLength = std::filesystem::file_size(tmpFile->Path());
+
+
+
+                res.set(HttpField::content_type, BANK_MIME_TYPE);
                 res.set(HttpField::cache_control, "no-cache");
-                res.setContentLength(content.length());
+                res.setContentLength(contentLength);
                 res.set(HttpField::content_disposition, GetContentDispositionHeader(name, BANK_EXTENSION));
-                res.setBody(content);
+                res.setBodyFile(tmpFile);
             }
             else
             {
@@ -315,6 +372,32 @@ public:
             return fileNames[0];
         }
     }
+    static bool HasSingleRootDirectory(ZipFileReader&zipFile) {
+        bool hasDirectory = false;
+        std::string previousDirectory;
+        for (auto& file: zipFile.GetFiles())
+        {
+            auto pos = file.find('/');
+            if (pos == std::string::npos) {
+                // a file in the root.
+                return false;
+            } else 
+            {
+                std::string currentRootDirectory  = file.substr(0,pos);
+                if (hasDirectory) {
+                    if (currentRootDirectory != previousDirectory)
+                    {
+                        return false;
+                    }
+                } else {
+                    hasDirectory = true;
+                    previousDirectory = currentRootDirectory;
+                }
+            }
+        }
+        return true;
+    }
+
     virtual void post_response(
         const uri &request_uri,
         HttpRequest &req,
@@ -327,11 +410,28 @@ public:
 
             if (segment == "uploadPluginPresets")
             {
-                json_reader reader(req.get_body_input_stream());
                 PluginPresets presets;
+                fs::path filePath = req.get_body_temporary_file();
+                if (filePath.empty()) 
+                {
+                    throw std::runtime_error("Unexpected.");
+                }
+                if (IsZipFile(filePath))
+                {
+                    auto presetReader = PresetBundleReader::LoadPluginPresetsFile(*(this->model),filePath);
+                    presetReader->ExtractMediaFiles();
+
+                    std::stringstream ss(presetReader->GetPluginPresetsJson());
+                    json_reader reader(ss);
                     reader.read(&presets);
+
+                } else {
+                    json_reader reader(req.get_body_input_stream());
+                    reader.read(&presets);
+                }
                 model->UploadPluginPresets(presets);
 
+
                 res.set(HttpField::content_type, "application/json");
                 res.set(HttpField::cache_control, "no-cache");
                 std::stringstream sResult;
@@ -343,7 +443,27 @@ public:
             }
             else if (segment == "uploadPreset")
             {
+
+                BankFile bankFile;
+
+                fs::path filePath = req.get_body_temporary_file();
+                if (filePath.empty()) 
+                {
+                    throw std::runtime_error("Unexpected.");
+                }
+                if (IsZipFile(filePath))
+                {   
+                    auto presetReader = PresetBundleReader::LoadPresetsFile(*(this->model),filePath);
+                    presetReader->ExtractMediaFiles();
+
+                    std::stringstream ss(presetReader->GetPresetJson());
+                    json_reader reader(ss);
+                    reader.read(&bankFile);
+                } else {
+                    // legacy json format, no zip, no media files.
                     json_reader reader(req.get_body_input_stream());
+                    reader.read(&bankFile);
+                }
 
                 uint64_t uploadAfter = -1;
                 std::string strUploadAfter = request_uri.query("uploadAfter");
@@ -351,10 +471,6 @@ public:
                 {
                     uploadAfter = std::stol(strUploadAfter);
                 }
-
-                BankFile bankFile;
-                reader.read(&bankFile);
-
                 uint64_t instanceId = model->UploadPreset(bankFile, uploadAfter);
 
                 res.set(HttpField::content_type, "application/json");
@@ -363,12 +479,31 @@ public:
                 sResult << instanceId;
                 std::string result = sResult.str();
                 res.setContentLength(result.length());
-
                 res.setBody(result);
             }
             else if (segment == "uploadBank")
             {
+
+                BankFile bankFile;
+
+                fs::path filePath = req.get_body_temporary_file();
+                if (filePath.empty()) 
+                {
+                    throw std::runtime_error("Unexpected.");
+                }
+                if (IsZipFile(filePath))
+                {   
+                    auto presetReader = PresetBundleReader::LoadPresetsFile(*(this->model),filePath);
+                    presetReader->ExtractMediaFiles();
+
+                    std::stringstream ss(presetReader->GetPresetJson());
+                    json_reader reader(ss);
+                    reader.read(&bankFile);
+                } else {
+                    // legacy json format, no zip, no media files.
                     json_reader reader(req.get_body_input_stream());
+                    reader.read(&bankFile);
+                }
 
                 uint64_t uploadAfter = -1;
                 std::string strUploadAfter = request_uri.query("uploadAfter");
@@ -377,9 +512,6 @@ public:
                     uploadAfter = std::stol(strUploadAfter);
                 }
 
-                BankFile bankFile;
-                reader.read(&bankFile);
-
                 uint64_t instanceId = model->UploadBank(bankFile, uploadAfter);
 
                 res.set(HttpField::content_type, "application/json");
@@ -394,10 +526,10 @@ public:
             {
                 res.set(HttpField::content_type, "application/json");
                 res.set(HttpField::cache_control, "no-cache");
-                const std::string instanceId = request_uri.query("id");
+                std::string instanceId = request_uri.query("id");
-                const std::string directory = request_uri.query("directory");
+                std::string directory = request_uri.query("directory");
-                const std::string filename = request_uri.query("filename");
+                std::string filename = request_uri.query("filename");
-                const std::string patchProperty = request_uri.query("property");
+                std::string patchProperty = request_uri.query("property");
 
 
                 if (patchProperty.length() == 0 && directory.length() == 0)
@@ -415,9 +547,14 @@ public:
                 {
                     ExtensionChecker extensionChecker { request_uri.query("ext") };
                     namespace fs = std::filesystem;
+
                     try {
-                        auto zipFile = ZipFile::Create(req.get_body_temporary_file());
+                        auto zipFile = ZipFileReader::Create(req.get_body_temporary_file());
                         std::vector<std::string> files = zipFile->GetFiles();
+                        bool hasSingleRootDirectory = HasSingleRootDirectory(*zipFile);
+                        if (!hasSingleRootDirectory) {
+                            directory = (fs::path(directory) / fs::path(filename).filename().replace_extension("")).string();
+                        }
                         for (const auto&inputFile : files)
                         {
                             if (!inputFile.ends_with("/")) // don't process directory entries.

src/ZipFile.cpp

@@ -27,14 +27,20 @@
 
 using namespace pipedal;
 
-ZipFile::ZipFile()
+ZipFileReader::ZipFileReader()
 {
 }
-ZipFile::~ZipFile()
+ZipFileReader::~ZipFileReader()
+{
+}
+ZipFileWriter::ZipFileWriter()
+{
+}
+ZipFileWriter::~ZipFileWriter()
 {
 }
 
-class ZipFileImpl : public ZipFile
+class ZipFileImpl : public ZipFileReader
 {
 public:
     ZipFileImpl(const std::filesystem::path &path)
@@ -49,6 +55,7 @@ public:
     }
     virtual ~ZipFileImpl();
     virtual std::vector<std::string> GetFiles() override;
+    virtual bool CompareFiles(const std::string &zipName, const std::filesystem::path& path) override;
     virtual void ExtractTo(const std::string &zipName, const std::filesystem::path &path) override;
     virtual zip_file_input_stream GetFileInputStream(const std::string& filename,size_t bufferSize = 16*1024) override;
     virtual size_t GetFileSize(const std::string&filename) override;
@@ -59,9 +66,9 @@ private:
     zip_t *zipFile = nullptr;
 };
 
-ZipFile::ptr ZipFile::Create(const std::filesystem::path &path)
+ZipFileReader::ptr ZipFileReader::Create(const std::filesystem::path &path)
 {
-    return std::shared_ptr<ZipFile>(new ZipFileImpl(path));
+    return std::shared_ptr<ZipFileReader>(new ZipFileImpl(path));
 }
 ZipFileImpl::~ZipFileImpl()
 {
@@ -88,6 +95,85 @@ std::vector<std::string> ZipFileImpl::GetFiles()
     return result;
 }
 
+
+bool ZipFileImpl::CompareFiles(const std::string &zipName, const std::filesystem::path &path)
+{
+    auto fi = nameMap.find(zipName);
+    if (fi == nameMap.end())
+    {
+        // must call GetFiles() firest.
+        throw std::runtime_error("Zip content file not found.");
+    }
+    zip_int64_t fileIndex = fi->second;
+
+    zip_stat_t zip_stat;
+    if (zip_stat_index(zipFile, fileIndex, 0, &zip_stat) < 0) {
+        throw std::runtime_error(SS("Failed to get file stats: " << zip_strerror(zipFile)));
+    }    
+
+    auto targetSize = std::filesystem::file_size(path);
+    if (targetSize != zip_stat.size)
+    {
+        return false;
+    }
+
+    zip_file_t *fIn = zip_fopen_index(this->zipFile, fileIndex, 0);
+    if (fIn == nullptr)
+    {
+        zip_error_t *error = zip_get_error(this->zipFile);
+        const char *strError = zip_error_strerror(error);
+
+        throw std::runtime_error(SS("Failed to read zip content file. " << strError));
+    }
+    Finally t{[fIn]() mutable
+              {
+                  zip_fclose(fIn);
+              }};
+
+    FILE*fTarget = fopen(path.c_str(),"r");
+    if (fTarget == nullptr) 
+    {
+        throw std::runtime_error(SS("Failed to read  file " << path << "."));
+    }
+    Finally ffTarget{[fTarget]() mutable {
+       fclose(fTarget); 
+    }};
+
+    constexpr int BUFFER_SIZE = 16 * 1024;
+    std::vector<char> vBuff(BUFFER_SIZE);
+    std::vector<char> vBuff2(BUFFER_SIZE);
+    char *pBuff = (char *)&(vBuff[0]);
+    char *pBuff2 = (char *)&(vBuff2[0]);
+    while (true)
+    {
+        zip_int64_t nRead = zip_fread(fIn, pBuff, BUFFER_SIZE);
+        if (nRead == -1)
+        {
+            zip_error_t *error = zip_file_get_error(fIn);
+            const char *strError = zip_error_strerror(error);
+            throw std::runtime_error(SS("Error reading zip content file." << strError));
+        }
+        auto nTargetRead = fread(pBuff2,1,BUFFER_SIZE,fTarget);
+
+        if ((zip_int64_t)nTargetRead != nRead)
+        {
+            return false;
+        }
+        if (nRead == 0) 
+        {
+            return true;
+        }
+        for (zip_int64_t i = 0; i < nRead; ++i)
+        {
+            if (pBuff2[i] != pBuff[i])
+            {
+                return false;
+            }
+        }
+    }
+}
+
+
 void ZipFileImpl::ExtractTo(const std::string &zipName, const std::filesystem::path &path)
 {
     auto fi = nameMap.find(zipName);
@@ -120,7 +206,7 @@ void ZipFileImpl::ExtractTo(const std::string &zipName, const std::filesystem::p
     while (true)
     {
         zip_int64_t nRead = zip_fread(fIn, pBuff, BUFFER_SIZE);
-        if (nRead = 0)
+        if (nRead == 0)
             break;
         if (nRead == -1)
         {
@@ -215,3 +301,68 @@ size_t ZipFileImpl::GetFileSize(const std::string&filename)
     }
     return stat.size;
 }
+
+class ZipFileWriterImpl : public ZipFileWriter
+{
+public:
+    ZipFileWriterImpl(const std::filesystem::path &path)
+        : path(path)
+    {
+        int errorOp = 0;
+        zipFile = zip_open(path.c_str(), ZIP_CREATE | ZIP_TRUNCATE, &errorOp);
+        if (zipFile == nullptr)
+        {
+            throw std::runtime_error("Can't open zip file.");
+        }
+    }
+    virtual ~ZipFileWriterImpl();
+
+    virtual void Close() override; 
+
+    virtual void WriteFile(const std::string &zipFilename,  const std::filesystem::path&sourceFilePath) override;
+    virtual void WriteFile(const std::string&filename, const void*buffer, size_t length) override;
+private:
+    std::map<std::string, zip_int64_t> nameMap; // avoid o(2) extraction operations.
+    const std::filesystem::path path;
+    zip_t *zipFile = nullptr;
+};
+
+ZipFileWriter::ptr ZipFileWriter::Create(const std::filesystem::path &path)
+{
+    return std::make_unique<ZipFileWriterImpl>(path);
+}
+
+void ZipFileWriterImpl::Close() {
+    if (zipFile) {
+        zip_close(zipFile);
+        zipFile = nullptr;
+    }
+}
+ZipFileWriterImpl::~ZipFileWriterImpl()
+{
+    Close();
+}
+
+void ZipFileWriterImpl::WriteFile(const std::string &filename, const std::filesystem::path &path)
+{
+    zip_error_t error;
+    zip_source_t *source = zip_source_file_create(path.c_str(),0,-1,&error);
+    if (!source) {
+        throw std::runtime_error(SS("Unable to create zip source for file " << path));
+    }
+    if (zip_file_add(zipFile,filename.c_str(),source,ZIP_FL_ENC_UTF_8) < 0)
+    {
+        zip_source_free(source);
+        throw std::runtime_error(SS("Unable to create add file  " << path));
+    }
+}
+void ZipFileWriterImpl::WriteFile(const std::string&filename, const void*buffer, size_t length) 
+{
+    zip_source_t *source = zip_source_buffer(zipFile,buffer,length,0);
+
+    if (zip_file_add(zipFile,filename.c_str(),source,ZIP_FL_ENC_UTF_8) < 0)
+    {
+        zip_source_free(source);
+        throw std::runtime_error(SS("Failed to add file to zip: " << zip_strerror(zipFile)));
+    }
+}

src/ZipFile.hpp

@@ -28,6 +28,12 @@
 
 namespace pipedal {
 
+    class ZipFileFileReader {
+    public:
+    private:
+        zip_file_t*file = nullptr;
+    };
+    
     class zip_file_input_stream_buf : public std::streambuf {
     private:
         zip_file_t* file;
@@ -51,21 +57,44 @@ namespace pipedal {
 
         }
     };
-    class ZipFile {
+    class ZipFileReader {
     protected:
-        ZipFile();
+        ZipFileReader();
 
     public:
-        using ptr = std::shared_ptr<ZipFile>;
+        using ptr = std::shared_ptr<ZipFileReader>;
         static ptr Create(const std::filesystem::path &path);
-        ZipFile(const ZipFile&) = delete;
+        ZipFileReader(const ZipFileReader&) = delete;
-        ZipFile&operator=(const ZipFile&) = delete;
+        ZipFileReader&operator=(const ZipFileReader&) = delete;
-        virtual ~ZipFile();
+        virtual ~ZipFileReader();
 
         virtual std::vector<std::string> GetFiles() = 0;
         virtual void ExtractTo(const std::string &zipName, const std::filesystem::path& path) = 0;
+        virtual bool CompareFiles(const std::string &zipName, const std::filesystem::path& path) = 0;
         virtual zip_file_input_stream GetFileInputStream(const std::string& filename,size_t bufferSize = 16*1024) = 0;
         virtual size_t GetFileSize(const std::string&filename) = 0;
 
     };
+
+    class ZipFileWriter;
+
+    
+    class ZipFileWriter {
+    protected:
+        ZipFileWriter();
+
+    public:
+        using self = ZipFileWriter();
+        using ptr = std::shared_ptr<ZipFileWriter>;
+        static ptr Create(const std::filesystem::path &path);
+
+        ZipFileWriter(const ZipFileReader&) = delete;
+        ZipFileWriter&operator=(const ZipFileWriter&) = delete;
+        virtual ~ZipFileWriter();
+
+        virtual void Close() = 0;
+
+        virtual void WriteFile(const std::string &filename, const std::filesystem::path&path) =  0;
+        virtual void WriteFile(const std::string&filename, const void*buffer, size_t length) = 0;
+    };
 }

todo.txt

@@ -1,53 +1,55 @@
-- X test reconnect sequence in client.
+ToobFreeverb has a big memory leak!
+
+Do we have to deactivate both Audio handles after an underrun? I think so.
+
+Error and message and loading overlays have to go above PerformanceView
+
+Back Button sequence for performance view.
+
+Review state changing code. Do we need this anymmore? I think not.
+
+
+Review current handleNotifyPatchProperty. I tink server-side support needs to be
+removed, and rely on handleNotifyPathPatchPropertyChanged instead.
+
+private handleNotifyPatchProperty(clientHandle: number, instanceId: number, propertyUri: string, jsonObject: any) {
+
+Midi bindings.    
+
+SEGV at void PiPedalModel::OnNotifyMaybeLv2StateChanged(uint64_t instanceId)
+            bool changed = this->audioHost->UpdatePluginState(*item);
+            PiPedalModel.cpp:375
+
+       because audioHost is gone.
+       revamp shutdown procedure for the audio thread. 
+       write a marker on exit, and don't  release 
+       audioHost UNTIL the service thread has read the close marker.
+       
+- continuing corrupt memory.
+- LV2 STATE and properties DO NOT MATCH in saved files.
+- LV2_STATE is not populated wiht properties are.
+- properties are not popluate when LV_sate Is.
+- FINISH PATH property running updates code.
+  Maybe we should be using LV2_State (if we can capture it  
+  propertly. ) 
+         
 
--X remove 10-pipedal-networkmanager.rules before testing installer.
 
-- new signing procedure.
 
 - verify that scanning doesn't cause overruns.
 - verify address change behaviour in client
-- verify stripping in installer.
-- verify update with no keyring.
 -verify clean removal of dhcpcd and nm_p2p2d
 
 X Review docs changes once we go live.
 
-- Back button after reloads on Android.
+- Localisation: support non-UTF8 code pages.
-
-Localisation: support non-UTF8 code pages.
 - unicode commandline arguments.
 - review unicode filenames (this is probably ok)
 
-- make app use the same theme settings as the website. (make the website use the same theme as the app)
 - BUG: gcs when we have an animated output control
-- versioning.
-
-
-
-
-
-
-Package: raspi-firmware
-Version: 1:1.20240902-1
-
-Package: raspi-firmware
-Version: 1.20220830+ds-1
-
-
-Package: firmware-brcm80211
-Source: firmware-nonfree
-Version: 1:20230625-2+rpt3
-
-Package: f
-
-
-downgrade:
-sudo apt install raspi-firmware=1.20220830+ds-1
-sudo apt install firmware-brcm80211=1:20230625-2+rpt2
-
 
 
 Pri Description
 -----------------
-8 Migrate to Vite toolchain.
 5 Re-use plugin instances when rebuilding pedalboard.
+8 Migrate to Vite toolchain.