shawn
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Core session management:
- MixerSession: full mixer state as versioned JSON (channels, buses, routing, plugins, MIDI, transport, automation)
- SessionManager: save/load/list/delete/rename/duplicate/import/export sessions to ~/.config/rpi-mixer/sessions/
- Setlist: ordered collection of sessions with transition types (cut, crossfade, wait)
- SnapshotEngine: instant scene capture/recall with persistence, categories, next/prev
API endpoints (all under /api/v1/):
- GET/POST/DELETE /sessions — list, save, load, delete, info
- POST /sessions/{name}/rename, /duplicate, /export, /import
- GET/POST/DELETE /setlists — list, save, load, delete
- GET/POST/DELETE /snapshots — list, capture, recall, delete, next, prev
- GET/POST /sessions/autosave — status, enable, disable
Web UI:
- Sessions tab: full session browser with load/delete/duplicate/export
- Setlists subtab: create/edit/activate setlist with entry management
- Snapshots subtab: capture/recall with category badges
- Auto-save status indicator
- Import/export all sessions as zip
Kivy touchscreen UI:
- New SES tab with sessions/setlists/snapshots sub-views
- Touch-optimized cards with save/load/delete actions
Tests: 51 new tests, 735 project total — all passing
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