SDK / exoplayer

It's more flexible to use FakeDataSource, since it allows to testing
different upstream behaviors (e.g., upstream not being able to resolve
the content length).

PiperOrigin-RevId: 362072899

So as for the user to be able to inject them.

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#minor-release

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In a period transition we pass the start time of the next period, for
the final period we pass the duration of the period or timeline, if
known.

This means sideloaded subtitles now respect the end point of
ClippingMediaSource and ensures that content subtitles aren't
incorrectly displayed over mid-roll ads.

When transitioning back into the subtitled content the subtitles still
appear slightly before the video transitions, meaning the first subtitle
of the content is shown with the last few frames of the ad. Resolving
this in a way that doesn't break anything else requires a deeper
investigation.

Issue: #5317
Issue: #8456
#minor-release
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MaskingMediaSource needs to resolve the prepare position set for a MaskingPeriod
while the source was still unprepared to the first actual prepare position.

It currently assumes that the period-window offset and the default position is
zero. This assumption is correct when a PlaceholderTimeline is used, but it
may not be true if the real timeline is already known (e.g. when re-preparing
a live stream after a playback error).

Fix this by using the known timeline at the time of the preparation.
Also:
 - Update a test that should have caught this to use lazy re-preparation.
 - Change the demo app code to use the recommended way to restart playback
   after a BehindLiveWindowException.

Issue: #8675
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- Avoid having two onPositionDiscontinuity events (seek and transition)
  sent after a seek to another media item.
- Avoid triggering an onPositionDiscontinuity event after a timeline
  change.

#minor-release

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It's to comply with style guide as they are public.

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Issue: #8664
#minor-release
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It's for consistency throughout libraries.

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exoplayer can enable dolby passthrough on xiaomi device when get
EXTERNAL_SURROUND_SOUND_KEY

Signed-off-by: joakimzhang <zq15011526977@gmail.com>

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#minor-release

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exp (ExoPlayer prepare)
ffr (First Frame Rendered)
psr (Player State Ready).

2) Modifies aci/acc vci/vcc to report timing from ExoPlayer Playback thread.

3) Fix to report pvri and pari for every playback.

and other minor bug fixes.

PiperOrigin-RevId: 360228206

Issue: #8646
#minor-release
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PiperOrigin-RevId: 360175031