fuchsia_audiofuchsia_audio (and fuchsia_audio_fdomain, which is equivalent and will soon be renamed to fuchsia_audio when the current fuchsia_audio is removed) is a library for interacting with Fuchsia audio devices.
This project should be automatically included in builds.
fuchsia_audio can be used by depending on the //src/media/audio/lib/rust GN target and then using the fuchsia_audio crate in a Rust project.
fuchsia_audio is not available in the SDK.
Unit tests for fuchsia_audio are available in the fuchsia_audio_tests package:
$ fx test fuchsia_audio_tests
You'll need to include //src/media/audio/lib/rust:tests in your build, either by using fx args to put it under universe_package_labels, or by fx set [....] --with //src/media/audio/lib/rust:tests.