affc237055
Previously `ChannelMixingAudioProcessor` output float because it was implemented using the audio mixer's float mixing support. Move the implementation over to just using the `ChannelMixingMatrix` and make it publicly visible in the common module so it can be used by apps for both playback and export. Also resolve a TODO that no longer had a bug attached by implementing support for putting multiple mixing matrices to handle different input audio channel counts, and fix some nits in the test code. Tested via unit tests and manually configuring a `ChannelMixingAudioProcessor` in the transformer demo app and playing an audio stream that identifies channels, and verifying that they are remapped as expected. PiperOrigin-RevId: 523653901
Transformer module
Provides functionality for transforming media files.
Getting the module
The easiest way to get the module is to add it as a gradle dependency:
implementation 'androidx.media3:media3-transformer:1.X.X'
where 1.X.X is the version, which must match the version of the other media
modules being used.
Alternatively, you can clone this GitHub project and depend on the module locally. Instructions for doing this can be found in the top level README.