Initial extraction: C++ MixerEngine standalone daemon

Extracted from op-pedal mixer-engine branch. Core components: - MixerEngine / MixerChannelStrip / MixerBus — cleaned of LV2/Pedalboard/IHost/MidiMapper deps - MixerControlServer — Unix domain socket JSON control interface - main.cpp — JACK audio I/O client with headless fallback - CMake build — auto-fetches nlohmann/json, links JACK - 9 core tests passing Architecture: JACK ports → MixerEngine::process() → JACK ports, controlled via Unix socket JSON commands.
2026-06-23 12:17:45 -04:00
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+// Copyright (c) 2026 Ourpad Network
+// See LICENSE file in the project root for full license text.
+
+#pragma once
+
+#include <string>
+#include <thread>
+#include <atomic>
+#include "mixer/MixerEngine.hpp"
+
+namespace mixer {
+
+/// Unix domain socket JSON control server for the MixerEngine.
+///
+/// Listens on a Unix domain socket (default: /tmp/mixer-daemon.sock).
+/// Each client connection sends one JSON command per line and receives
+/// one JSON response per line.
+///
+/// Supported commands:
+///   {"cmd":"getState"}                    → full mixer state snapshot
+///   {"cmd":"getVU"}                        → VU levels for all channels
+///   {"cmd":"setChannelVolume","channel":N,"volume":-6.0}
+///   {"cmd":"setChannelPan","channel":N,"pan":0.0}
+///   {"cmd":"setChannelMute","channel":N,"mute":true}
+///   {"cmd":"setChannelSolo","channel":N,"solo":false}
+///   {"cmd":"setChannelLabel","channel":N,"label":"Guitar"}
+///   {"cmd":"setBusVolume","busId":N,"volume":0.0}
+///   {"cmd":"setBusMute","busId":N,"mute":false}
+///   {"cmd":"routeChannelToBus","channel":N,"busId":N,"level":0.0}
+///   {"cmd":"routeBusToBus","sourceBusId":N,"targetBusId":N,"level":0.0}
+///   {"cmd":"removeRoute","sourceId":N,"targetBusId":N}
+///   {"cmd":"autoCreateChannels","inputs":N,"outputs":N}
+///   {"cmd":"addChannel","physicalInput":N}    → {"status":"ok","channelIndex":N}
+///   {"cmd":"removeChannel","channel":N}
+class MixerControlServer {
+public:
+    MixerControlServer(MixerEngine* engine, const std::string& socketPath = "/tmp/mixer-daemon.sock");
+    ~MixerControlServer();
+
+    // Disable copy
+    MixerControlServer(const MixerControlServer&) = delete;
+    MixerControlServer& operator=(const MixerControlServer&) = delete;
+
+    /// Start the control server in a background thread.
+    /// Returns true if the socket was created successfully.
+    bool start();
+
+    /// Stop the control server and join the thread.
+    void stop();
+
+    /// True if the server is running.
+    bool running() const { return running_.load(); }
+
+private:
+    MixerEngine* engine_;
+    std::string socketPath_;
+    int serverFd_ = -1;
+    std::thread serverThread_;
+    std::atomic<bool> running_{false};
+
+    // Server thread main loop
+    void serverLoop();
+
+    // Handle one client connection
+    void handleClient(int clientFd);
+
+    // Process a single JSON command and return JSON response
+    std::string processCommand(const std::string& commandJson);
+
+    // Helper: build full state JSON
+    std::string buildStateJson() const;
+
+    // Helper: build VU JSON
+    std::string buildVuJson() const;
+};
+
+} // namespace mixer