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P2-R1: ALSA + JACK2 low-latency config (scripts, quirks, tuning) P2-R2: Carla integration (build scripts, 8ch rack config, NAM LV2 support) P2-R3: Plugin manager, categories, blacklist, NAM model support P3-R1: Mixer DSP engine (channel strip, routing matrix, bus mgr, automation) P4-R1: MIDI engine (learn mode, clock sync, HID discovery, mapping store) P4-R2: Network API (OSC server, FastAPI REST, WebSocket, auth, rate limiter) P5-R1: Touchscreen UI evaluation + main entry point docs: Audio stack, Carla integration, MIDI support, UI evaluation tests: Full test suite (292 passing)
215 lines
7.4 KiB
Python
215 lines
7.4 KiB
Python
#!/usr/bin/env python3
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"""
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carla-preset-gen — Generate Carla rack preset (.carxp) for the mixer setup.
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Creates a default 8-channel mixer rack with:
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- 2 USB input channels (capture_1/2 → EQ → Comp → Gate)
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- 1 NAM guitar channel (capture_3 → NAM → IR loader)
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- 2 stereo aux buses (Reverb, Delay)
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- Master output to playback_1/2
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Usage:
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python3 scripts/carla-preset-gen.py > config/carla-default.carxp
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python3 scripts/carla-preset-gen.py --channels 4 > config/carla-4ch.carxp
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"""
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import sys
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import xml.etree.ElementTree as ET
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from datetime import datetime
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# JACK port mapping (matches audio-stack-config parent task)
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# hw:USB is configured with JACK at 48kHz, 128f/3p
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JACK_SAMPLE_RATE = 48000
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JACK_BUFFER_SIZE = 128
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def indent_xml(elem, level=0):
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"""Pretty-print XML element tree."""
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i = "\n" + level * " "
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if len(elem):
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if not elem.text or not elem.text.strip():
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elem.text = i + " "
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if not elem.tail or not elem.tail.strip():
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elem.tail = i
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for subelem in elem:
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indent_xml(subelem, level + 1)
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if not elem.tail or not elem.tail.strip():
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elem.tail = i
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else:
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if level and (not elem.tail or not elem.tail.strip()):
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elem.tail = i
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def build_rack_xml(num_channels=8):
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"""Construct a Carla rack preset XML with standard mixer layout."""
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root = ET.Element("CARLA-PRESET", version="2.6.0")
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ET.SubElement(root, "Info", Name="RPi Mixer Default Rack", Author="hermes-kanban")
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# ── Engine settings ─────────────────────────────────
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engine = ET.SubElement(root, "Engine")
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ET.SubElement(engine, "AudioDriver").text = "JACK"
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ET.SubElement(engine, "ProcessMode").text = "MultipleClients" # each plugin = separate JACK client
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ET.SubElement(engine, "TransportMode").text = "Disabled"
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ET.SubElement(engine, "SampleRate").text = str(JACK_SAMPLE_RATE)
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ET.SubElement(engine, "BufferSize").text = str(JACK_BUFFER_SIZE)
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ET.SubElement(engine, "ForceStereo").text = "true"
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# ── Plugin rack ─────────────────────────────────────
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rack = ET.SubElement(root, "Rack")
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rack.set("enabled", "true")
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plugin_id = 0
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def add_plugin(name, plugin_type, uri_or_binary, params=None, enabled="true", bypass="false"):
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nonlocal plugin_id
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pid = plugin_id
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plugin_id += 1
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plugin = ET.SubElement(rack, "Plugin")
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plugin.set("id", str(pid))
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plugin.set("name", name)
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plugin.set("type", plugin_type)
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plugin.set("uri", uri_or_binary)
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plugin.set("enabled", enabled)
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plugin.set("bypass", bypass)
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plugin.set("drywet", "1.0")
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plugin.set("volume", "0.0") # dB
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if params:
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for pname, pval in params.items():
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param = ET.SubElement(plugin, "Parameter")
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param.set("name", pname)
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param.set("value", str(pval))
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return pid
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# Channel 1 — Mic/Line input with EQ and Comp
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add_plugin("Ch1 Gate",
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"LV2",
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"http://calf.sourceforge.net/plugins/Gate",
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{"threshold": "-40", "ratio": "4.0", "attack": "10", "release": "100"})
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add_plugin("Ch1 EQ",
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"LV2",
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"http://calf.sourceforge.net/plugins/Equalizer12Band",
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{})
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add_plugin("Ch1 Comp",
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"LV2",
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"http://calf.sourceforge.net/plugins/Compressor",
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{"threshold": "-20", "ratio": "4.0", "attack": "5", "release": "50", "makeup": "3"})
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# Channel 2 — Second input
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add_plugin("Ch2 Gate",
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"LV2",
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"http://calf.sourceforge.net/plugins/Gate",
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{"threshold": "-40", "ratio": "4.0"})
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add_plugin("Ch2 EQ",
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"LV2",
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"http://calf.sourceforge.net/plugins/Equalizer8Band",
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{})
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add_plugin("Ch2 Comp",
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"LV2",
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"http://calf.sourceforge.net/plugins/Compressor",
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{"threshold": "-20", "ratio": "4.0"})
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# Channel 3 — Guitar / NAM channel
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add_plugin("Ch3 NAM",
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"LV2",
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"http://github.com/mikeoliphant/neural-amp-modeler-lv2",
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{"model": "/home/pi/nam-models/default.nam"})
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add_plugin("Ch3 IR Loader",
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"LV2",
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"http://guitarix.org/plugins/gx_ampmodeller",
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{})
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# AUX 1 — Reverb
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add_plugin("AUX1 Hall Reverb",
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"LV2",
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"http://calf.sourceforge.net/plugins/Reverb",
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{"decay_time": "2.5", "dry/wet": "0.3", "room_size": "0.7"})
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# AUX 2 — Delay
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add_plugin("AUX2 Delay",
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"LV2",
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"http://calf.sourceforge.net/plugins/VintageDelay",
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{"time_l": "250", "time_r": "375", "feedback": "0.4", "dry/wet": "0.25"})
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# Master chain — Limiter
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add_plugin("Master Limiter",
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"LV2",
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"http://calf.sourceforge.net/plugins/Limiter",
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{"limit": "-1.0", "threshold": "-3.0", "release": "20"})
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return root
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def build_patchbay_xml():
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"""Construct patchbay connection rules for JACK auto-routing."""
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root = ET.Element("CARLA-PATCHBAY", version="2.6.0")
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# Connection rules: source → destination with optional regex
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rules = [
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# System captures → Channel inputs
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("system:capture_1", "Carla:Ch1_Gate_in1", "Capture 1 → Ch1 Gate"),
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("system:capture_2", "Carla:Ch2_Gate_in1", "Capture 2 → Ch2 Gate"),
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("system:capture_3", "Carla:Ch3_NAM_in1", "Capture 3 → Guitar NAM"),
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# Master stereo output → system playback
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("Carla:Master_Limiter_out1", "system:playback_1", "Master L → Playback 1"),
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("Carla:Master_Limiter_out2", "system:playback_2", "Master R → Playback 2"),
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]
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for idx, (source, dest, label) in enumerate(rules):
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conn = ET.SubElement(root, "Connection")
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conn.set("id", str(idx))
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conn.set("source", source)
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conn.set("dest", dest)
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conn.set("label", label)
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conn.set("enabled", "true")
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return root
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# ── CLI interface ──────────────────────────────────────
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if __name__ == "__main__":
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num_channels = 8
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mode = "rack"
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args = sys.argv[1:]
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i = 0
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while i < len(args):
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if args[i] == "--channels" and i + 1 < len(args):
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num_channels = int(args[i + 1])
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i += 2
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elif args[i] == "--patchbay":
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mode = "patchbay"
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i += 1
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else:
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print(f"Unknown arg: {args[i]}", file=sys.stderr)
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sys.exit(1)
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if mode == "patchbay":
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xml = build_patchbay_xml()
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else:
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xml = build_rack_xml(num_channels)
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indent_xml(xml)
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ET.dump(xml)
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# Also write to config/ directory
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import os
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script_dir = os.path.dirname(os.path.abspath(__file__))
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config_dir = os.path.join(os.path.dirname(script_dir), "config")
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os.makedirs(config_dir, exist_ok=True)
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if mode == "patchbay":
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out_path = os.path.join(config_dir, "carla-patchbay.xml")
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else:
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out_path = os.path.join(config_dir, f"carla-{num_channels}ch-default.carxp")
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tree = ET.ElementTree(xml)
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indent_xml(xml)
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tree.write(out_path, encoding="utf-8", xml_declaration=True)
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print(f"\n[preset-gen] Written to {out_path}", file=sys.stderr)
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