770ca66fbc
HLS distinguishes between 'subtitles' (WebVTT or TTML distributed in
separate files with their own playlist) and 'captions' (CEA-608 or 708,
distributed muxed into the video file).
The format transformation added in 7b762642db
only applies to subtitles and not captions. This change makes the same
transformation for caption formats.
This resolves an error like:
```
SampleQueueMappingException: Unable to bind a sample queue to TrackGroup with MIME type application/cea-608.
```
Also add two playback tests for HLS CEA-608, one that parses during
decoding (old way) and one during extraction (new way). Adding these
tests is what alerted me to this issue.
PiperOrigin-RevId: 592571284
ExoPlayer HLS module
Provides support for HTTP Live Streaming (HLS) content in ExoPlayer.
Getting the module
The easiest way to get the module is to add it as a gradle dependency:
implementation 'androidx.media3:media3-exoplayer-hls: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.
Using the module
Adding a dependency to this module is all that's required to enable playback of
HLS media items added to ExoPlayer in its default configuration. Internally,
DefaultMediaSourceFactory will automatically detect the presence of the module
and convert an HLS MediaItem into an HlsMediaSource for playback.
Similarly, a DownloadManager in its default configuration will use
DefaultDownloaderFactory, which will automatically detect the presence of
the module and build HlsDownloader instances to download HLS content.
For advanced playback use cases, applications can build HlsMediaSource
instances and pass them directly to the player. For advanced download use cases,
HlsDownloader can be used directly.