olly a42d9f36b1 Allow output audio MIME type to be set in TranscodingTransformer.
This introduces a new option `setAudioMimeType` in `TranscodingTransformer.Builder` and a corresponding check whether the selected type is supported. This check is done using `supportsSampleMimeType` which is now part of the `Muxer.Factory` and `MuxerWrapper` rather than `Muxer`.
A new field `audioMimeType` is added to `Transformation` and the `TransformerAudioRenderer` uses this instead of the input MIME type if requested.

PiperOrigin-RevId: 405367817
2021-10-25 14:04:22 +01:00
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