SDK / exoplayer

This renderer will be extended by both vp9 and av1 renderers.

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We no longer need two modules as AndroidX-Test takes care of the system
abstraction and we no longer have Robolectric Handler/Looper workarounds.

PiperOrigin-RevId: 262363201

I think we need to start clearing the holder as part of the
DRM rework. When we do this, it'll only be valid to read
from the holder immediately after it's been populated.

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*** Original commit ***

Make Kotlin JVM annotations available and use in ExoPlayer.

NoExternal

***

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NoExternal

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We're no longer tied to the emsg spec, so we can skip unused fields
and assume ms for duration.

Also remove @Nullable annotation from EventMessageEncoder#encode, it
seems the current implementation never returns null

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We don't usually refer to other classes when documenting method parameters
but rather duplicate the actual definition.

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We already allow mixed mime type and mixed sample rate adaptation on request,
so for completeness, we can also allow mixed channel count adaptation.

Issue:#6257
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This only covers calls to scaleLargeTimestamp()

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This also decouples EventMessageEncoder's serialization schema from the emesg spec (it happens to still match the emsg-v0 spec, but this is no longer required).

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If we keep streams in chunk sources after selecting new tracks, we also keep
a reference to a stale disabled TrackSelection object. Fix this by updating
the TrackSelection object when keeping the stream. The static part of the
selection (i.e. the subset of selected tracks) stays the same in all cases.

Issue:#6256
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Issue:#6260
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We currently keep the sequence number if we don't reset the position. However,
the sequence number should be kept if we don't reset the state. Otherwise
re-prepare with position reset is counted as new playback although it's still
the same.

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- Test seeking to (timeUs=0, position=0), which should always work
  and produce the same output as initially reading from the start
  of the stream.
- Reset the input when testing seeking, to ensure IO errors are
  simulated for this case.

PiperOrigin-RevId: 261317898

- When in STATE_SEEK with targetGranule==0, seeking would exit
  without checking that the input was positioned at the correct
  place.
- Seeking could fail due to trying to read beyond the end of the
  stream.
- Seeking was not robust against IO errors during the skip phase
  that occurs after the binary search has sufficiently converged.

PiperOrigin-RevId: 261317035

PiperOrigin-RevId: 261312509

Two tests have very low propability flakiness (1:1000) due to not waiting for
a seek in one case and the chance of already being ended in another case.

Fix these and also adjust wrong comments about state changes.

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This will be used in common video renderer and decoder classes.

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These values can easily default to the empty track group and the empty
selection. As a result we can remove restrictions about not calling
holder.getTrackGroups before the period finished preparation.

PiperOrigin-RevId: 261280927

A previous change switched to calculation of the bitrate based on the
first MPEG audio header in the stream. This had the effect of fixing
seeking to be consistent with playing from the start for streams where
every frame has the same padding value, but broke streams where the
encoder (correctly) modifies the padding value to match the declared
bitrate in the header.

Issue: #6238
PiperOrigin-RevId: 261163904