SDK / exoplayer

To play slow motion streams where the audio has been recorded at
slower speeds, it is necessary to be able to resample (rather than
time-stretch) the audio. This change undeprecates back the previously
deprecated PlaybackParameters class to allow apps to set pitch.

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Issue: #7801
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<unknown commit> used a new API provided in API29+, changing this test's config to
use the newer SDK version.

TAP:https://test.corp.google.com/ui#d=targetZoomout&flags=CAMQAlhg&t=//third_party/java_src/android_libs/exoplayer/v2/library/core/src/test:test_com/google/android/exoplayer2/audio/MediaCodecAudioRendererTest
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This commit introduces the infrastructure classes, and a couple of
illustrative usages.

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We currently always reset everything if playingPeriod != readingPeriod.
However, this is only needed when the pausing is actually required, i.e.,
if the feature is enabled and we are in the last period of the window.

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Currently the audio renderer can become ready before the AudioTrack
actually has enough data to play something, which means that the
player may transition to the ready state before audio starts
playing. This makes the player's current state transition not very
useful for detecting when audio actually starts playing.

This change adds a new event to notify apps when the audio position
is increasing after a pause or seek/flush/reset event, and includes
an estimate of the system time at which audio playout started.

Issue: #7577
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r2.11.8

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Which saves the large parameter list.

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Previously, the fullscreen button and timebar has been overlapped in minimal mode

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Before this CL, SessionPlayerConnector getters had returned
UNKNOWN_TIME in idle state. It was because
SessionPlayerConnector had followed AndroidX media2
MediaPlayer's behavior, which was the baseline code of the
SessionPlayerConnector.

With this CL, SessionPlayerConnector getters directly return
underlying Player's value, rather than considering calls
in IDLE state as an exception and fallbacks to the default
UNKNOWN_TIME.

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It's not valid, and will cause IllegalSeekPositionException to be thrown

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- Remove throwing of IllegalStateException
- Make it non-final so additional metadata can be more easily filled in

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ExoPlayer is now the trusted source of playlist and can be
used by other components without breaking
SessionPlayerConnector's cached playlist.

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In AndroidX, both media1 and media2 have MediaItem classes,
so change the naming to remove ambiguity.

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Playlist can now be obtained directly from Timeline windows
in any state. So make ExoPlayer as the trusted source of
playlist, instead of SessionPlayerConnector.

PlayerWrapper still need to keep the list of media items.
It's used to detect whether the Timeline change is caused by
changes in media items or not, and only notify
SessionPlayer.PlayerCallback#onPlaylistChanged() only when
the playlist is really changed.

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In order to acquire a placeholder session, clients can call acquireSession
with a format with a null drmInitData.

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