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- src/streaming/ module: camera detection (USB webcam + Pi Camera Module via v4l2/libcamera), GStreamer pipeline builder with V4L2/OMX/x264 h264 encoders, platform presets (YouTube, Twitch, Facebook, custom RTMP), streamer lifecycle manager with auto-reconnect, scene management, stream statistics - Keyboard shortcut controller (evdev + pynput fallback) for stream control: Ctrl+Shift+S (start/stop), Ctrl+Shift+1-9 (scene switch), Ctrl+Shift+R (reconnect) - REST API: /api/v1/stream/* endpoints for start/stop/status, scenes, cameras, platforms, and hotkey listing — integrated into NetworkServer - StreamStateProvider bridging layer connects REST routes to Streamer instance - GStreamer pipeline supports ALSA/JACK/PulseAudio audio capture and V4L2/libcamera video capture with H.264 hardware encoding on RPi4B - Low-latency streaming settings for live performance (zerolatency, no B-frames) - 89 streaming tests (709 total project tests pass)
Raspberry Pi Real-Time Audio Mixer
RPi4B-based multi-channel real-time audio mixer with custom PREEMPT_RT kernel.
Architecture
- Platform: Raspberry Pi 4 Model B (8GB RAM)
- OS: Raspberry Pi OS Lite (64-bit, Bookworm) + custom PREEMPT_RT kernel
- Audio: USB audio interface with multi-channel I/O
- Goal: Low-latency (<10ms round-trip) multi-channel audio mixing
Project Structure
├── docs/ Research, architecture decisions, manuals
│ ├── research/ Technical research reports
│ ├── decisions/ Architecture Decision Records (ADRs)
│ └── manuals/ Hardware/software manuals and references
├── src/ Source code (audio engine, DSP, UI)
├── build/ Build scripts and cross-compilation tooling
├── recipes/ Buildroot/Yocto recipes (if applicable)
├── scripts/ Utility and deployment scripts
└── wiki/ Local wiki pages
Status
Phase 1-4: Core audio stack + MIDI controller support (in progress)
- P1-R1: System Research — USB audio, PREEMPT_RT kernel analysis
- P1-R2: Base OS Selection — RPiOS Lite 64-bit + custom PREEMPT_RT
- P2-R1: ALSA + JACK2 Low-Latency Config
- P4-R1: MIDI Controller Support — Binding + Learn Mode
- P3: Audio Engine — DSP pipeline, mixing engine
- P4: Hardware Integration — GPIO control surface
Getting Started
Documentation coming in Phase 2+
License
TBD