Metadata track not selected when allow chunkless preparation is true

[scottfennell]

Issue description

When utilizing the setAllowChunklessPreparation(true) for an HLS source timed ID3 metadata is not identified and the onMetadata callback is never called. It appears that a metadata source track is never identified when no sample chunks are downloaded. The DefaultTrackSelector.selectTracks output does not contain any metadata tracks and the Metadata renderer is never enabled.

Reproduction steps

Create a player that utilizes the setAllowChunlessPreparation for HLS with a onMetadata callback on the player - the onMetadata callback will never get called

new HlsMediaSource.Factory(dataSourceFactory)
    .setAllowChunklessPreparation(true)
    .createMediaSource(uri, mainHandler, eventLogger)

Version of ExoPlayer being used

2.7.0

Device(s) and version(s) of Android being used

Pixel 2 XL Oreo + various emulators

[AquilesCanta]

Hi @scottfennell, great to know you are using chunkless preparation. This is a known limitation, listed in our medium post:

ID3 tracks are not supported (there is no spec-defined way to declare ID3 tracks in playlists).

I will mark this as an enhancement, since one of the options we considered was preemptively declaring a track, like the TS extractor does. A commit ref will appear here once we push the workaround.

[ojw28]

I believe this can be marked as fixed (@AquilesCanta - Please re-open if there's more to do)

[AquilesCanta]

Please let us know if you run into any issues with ID3 while using chunkless preparation.