Mp4MediaStream の対応コーデックに AV1 を追加する

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Copilot Summary

This pull request adds support for the AV1 codec to the Mp4MediaStream package. The most important changes include updating documentation, modifying the mp4.rs file to handle the AV1 codec, and updating the TrackPlayer implementation to support AV1.

Documentation Updates:

• CHANGES.md: Added AV1 to the list of supported codecs for Mp4MediaStream.
• packages/mp4-media-stream/README.md: Updated the list of supported codecs to include AV1.

Code Updates:

• packages/mp4-media-stream/wasm/src/mp4.rs:

  • Imported Av01Box to handle AV1 codec.
  • Added from_av01_box method in VideoDecoderConfig to parse AV1 box information.
  • Updated Track and Mp4 implementations to recognize and process Av01 sample entries. [1] [2]

• packages/mp4-media-stream/wasm/src/player.rs:

  • Added support for AV1 in the TrackPlayer implementation.