Augmented Audio Libraries

Note about test coverage

Experiments trying to use Rust for audio programming.

Consider anything in this repository a draft.

License

Most of this repository is published under the MIT LICENSE.

Some directories which contain full applications are licensed under the AGPLv3 license. Check the LICENSE and README.md files.

📖 Documentation

• Augmented Audio Libraries
• Applications in this repository
  • Test plugin host
  • Metronome
  • Continuous Looper (native macOS)
  • Looper VST (iced)

⬇️ Binary downloads

• See releases to download binaries
• Simple Metronome on App Store
• Continuous Looper on App Store

💬 Blog posts

• Initial ‘Test Plugin Host’ post
• Simple Metronome release
• Generic AudioProcessors in Rust
• Continuous Looper - 8-track live-looper and performance sampler

• Simple standalone audio-app
• Effects and analysis
  • RMS, FFT, peak-detection, transient detection
  • Filters
  • Time-based effects (delay/reverb)
  • Compressor
  • Pitch-shifter
  • Bit-crusher
  • Utility (pan, mono, gain)

📸 Screenshots

👩 Web GUI

See docs/misc/WEB_GUI.md.

🛠 Rust libraries and tooling

Workspace & Building

The project is set-up with a cargo workspace. Running cargo commands at the root directory should compile all crates
sharing caches.

To build the whole project run:

git submodule update --init
cargo build

To run tests:

cargo test

On OSX you might want to run ./scripts/test.sh instead of that command.

Build outputs should be on target/debug or target/release.

Packaging apps and VSTs

Package VSTs using ./scripts/dev.sh build. This will build all the packages, build specific crates’ outputs with
./scripts/dev.sh build <path>.

Looper, Metronome and other (flutter / macOS builds)

See instructions on their READMEs under crates/apps.

Building on linux

Since this is bringing in all the possible rust crates, you’ll need to install quite a few dependencies.

See .github/workflows/default.yml for a list of what’s needed on Ubuntu.

Linting

cargo clippy

Benchmarking

Benchmarks using criterion will be slowly added. In order to run benchmarks use:

cargo bench

Profiling on macOS

https://crates.io/crates/cargo-instruments

cd ./crates/oscillator
cargo instruments -t time --bench sine_oscillator_benchmark -- --bench

Generating flamegraphs from benchmarks

NOTE I couldn’t get this to work on macOS

Flamegraphs can be generated using cargo-flamegraph:

cargo install flamegraph

The tool can then be used to run a criterion benchmark and generate a flamegraph:

cargo flamegraph --bench sine_oscillator_benchmark -- --bench

Snapshot testing audio processors

See docs/monorepo-tooling/SNAPSHOT_TESTING.md.

Debugging features

• https://crates.io/crates/cargo-whatfeatures