SDK / exoplayer

Being specific, this includes following changes
  - Remove PlaylistManager and TimelinePlaylistManager
    and use Player's playlist API directly.
  - Replace ConcatenatingMediaSource uses with
    ExoPlayer MediaItem.
  - Replace PlaybackPreparer uses with Player#prepare()
  - Add MediaItemConverter for developers to customize
    converting AndroidX MediaItems to ExoPlayer MediaItems
    and vice-versa.
  - Add DefaultMediaItemConverter for providing default
    implementation of both MediaItemConverter
    and MediaSourceFactory.

Note that removing PlaylistManager loses the ability
to suppress individual playlist API. But decided to remove
for simpler API set. The feature can be added back later
via explicit request.

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Skipping acquirePlaceholderSession which will be removed
in a following change.

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Previously, it refelects isPlaying() and it makes the button to seem
unresponsive when playback error occurs.

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AudioTrack.setPlaybackParams can be used to adjust playback speed.
This is preferable to application-level speed adjustment (currently
implemented in ExoPlayer) from API 23 because the speed change
occurs in the mixer, which means that the audio track buffer doesn't
need to drain out before the speed adjustment takes effect.

Issue: #7502
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It's quite hard to document drm_force_default_license_uri when the
actual license URI uses "url" terminology. This brings the two in
line.

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It's not used in the public exolist.json file. It's only use is to
disable the download icon for live content, but it's quite easy to
forget (there are live samples in our internal exolist.json files
that omit this property!).

It's better just to show a clear error message toast when the
download actually fails for this reason.

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- Simplify the ability to use placeholder DRM sessions to a boolean
- Remove unused IS_LIVE entry in the intent

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This will allow for better exception
on AudioTrack error.

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Also do some minor cleanup in DefaultAudioSink.

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Make it clear that setUri sets PlaybackProperties.uri

Also capitalise all references to DRM, ID, URI and UUID

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Also use it to replace the same logic in CapturingAudioSink

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Issue: Issue: #7735
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The code was mutating boolean across threads.

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For consistency with onShuffleModeEnabledChanged.

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Let the app know when offload scheduling is enabled or disabled.

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formatSupport is a 2-dimensional int array but it's documented as
being indexed by 3 things. This seems to be a copy-paste mistake in
https://github.com/google/ExoPlayer/commit/e97b8347eb190f12191c5b97d1c086326387f9bb

selectAllTracks() takes a 3-dimensional array with the same
3-indexed documentation, which makes sense there.

Also rename formatSupports -> formatSupport for consistency.

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