Rust engine
Real-time audio and mixing in Rust. The audio callback allocates nothing, so timing stays predictable under load.
Build with us
Mixar is open source: a Rust audio engine with a Flutter front end. Clone it, run it locally, and change whatever gets in your way.
Stack
Engine-first, with clean boundaries between audio, library, and UI.
Flutter UI
Decks, waveforms, and mixer chrome, in one UI codebase for desktop and the mobile targets to come.
Async buses
The UI talks to the engine, library, and controllers over async message buses, so engine code never runs on the UI thread.
Stem separation
HTDemucs splits a track into drums, bass, other, and vocals offline. GPU (WebGPU) when available, CPU otherwise, with no cloud round-trip.
Offline analysis
BPM, key, loudness, artwork, and waveforms are computed locally and cached in a SQLite library.
Pluggable backends
CPAL/PipeWire, miniaudio, or a null backend for tests, chosen at runtime behind one trait.
Architecture
UI, controllers, and engine stay in sync over cmd/evt buses. Transports move MessagePack in both directions, with a focused Rust crate behind each domain.
Get involved
Setup steps are in the README and contribution guidelines live on GitHub. Pick a bug or a rough edge you care about and start there.