Feature flags & platforms

Features

The default listener feature enables:

• CPAL input-device capture;
• channel downmixing;
• Rubato sample-rate conversion;
• Listener, ListenerBuilder, AudioDevice, and available_input_devices.

Disable it when the application supplies correctly formatted audio:

[dependencies]
micro-wakeword = { version = "0.1", default-features = false }

Detector, model parsing, feature extraction, inference, and runtime selection remain available.

Platform matrix

Platform	Compiles	Microphone backend	Bundled TFLite runtime
Windows x86-64	Yes	WASAPI through CPAL	Yes, TFLite 2.17.1
Linux x86-64 (glibc)	Yes	ALSA through CPAL	Yes, TFLite 2.17.1
Linux ARM64 (glibc)	Yes	ALSA through CPAL	Yes, TFLite 2.17.1
macOS Apple Silicon	Yes	CoreAudio through CPAL	Yes, TFLite 2.17.1
macOS Intel	Yes	CoreAudio through CPAL	Yes, TFLite 2.17.0

The target-specific library is embedded, extracted into the user’s OS cache, verified by SHA-256, and loaded by absolute path. Unsupported targets need Runtime::Path, Runtime::System, or an environment override. Linux binaries target glibc; musl is not currently bundled.

Build requirements

The crate compiles the TensorFlow microfrontend and KissFFT C++ sources. A working C/C++ compiler toolchain is required even when the microphone feature is disabled.

Platform support describes current build and runtime wiring, not a guarantee that every audio device or driver exposes a supported stream configuration. Handle Error::Audio when opening user hardware.