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: Research & Planning (in progress)

• P1-R1: System Research — USB audio, PREEMPT_RT kernel analysis
• P1-R2: Base OS Selection — RPiOS Lite 64-bit + custom PREEMPT_RT
• P1-R3: Project Infrastructure (current)
• P2: Kernel Build — custom PREEMPT_RT kernel compilation
• P3: Audio Engine — JACK/PipeWire integration, DSP pipeline
• P4: Hardware Integration — USB interface, GPIO control surface

Getting Started

Documentation coming in Phase 2+

License

TBD