SDK / exoplayer

In order to reuse it in LoadErrorHandlingPolicy.

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Seeking, live streams support and exposure of vorbis and ID3 data
are not part of this commit.

Issue: #6406
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- Make NonNull, which is already the case when using the manager builder.
- Better document PLAYREADY_CUSTOM_DATA_KEY, now that newPlayReadyInstance
  is no more.

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Issue:#4867
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The implementation of writing HDR10+ static metadata assumed that the
application would use default (big endian) byte order for this metadata but
MediaCodec expects the order to match the specification CTA-861.3.

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Issue: #6612
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ISSUE: #6545
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*** Original commit ***

Disable test coverage again

https://issuetracker.google.com/issues/37019591 causes local variables can't be found while debugging.

***

PiperOrigin-RevId: 280666758

Also remove the "do we really need to do this" comment for AAC.
Parsing from codec specific data is likely to be more robust, so
I think we should continue to do it for formats where we've seen
this problem.

Issue: #6648
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Previously the renderer EOS (aka last frame rendered), was reported as soon
as the last encoded frame was queued in the codec renderer.
This leaded to EOS reported too early.

PiperOrigin-RevId: 280456277

This speeds up downloads where segments have the same URL with different
byte ranges. We limit the merged segments to 20 seconds to ensure the download
progress of demuxed streams is roughly in line with the playable media duration.

Issue:#5978
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Clear state for one mode when entering the other in both SimpleExoPlayer
and SimpleDecoderVideoRenderer. The latter is redundant for the case of
renderers that are used inside SimpleExoPlayer, but seems nice to have.

- Entering Surface mode means receiving a non-null Surface, SurfaceHolder
  or TextureView in SimpleExoPlayer, or a non-null Surface in
  SimpleDecoderVideoRenderer.
- Entering VideoDecoderOutputBufferRenderer means receiving a non-null
  VideoDecoderOutputBufferRenderer in SimpleExoPlayer and
  SimpleDecoderVideoRenderer.

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Also add some missing Nullable annotations.

PiperOrigin-RevId: 280150512

This aligns the method naming and Javadoc. The only remaining
inconsistency I can see is that the initial reference count for
DrmSession is 0 rather than 1. Unfortunately I think it's not
trivial to get these aligned, because DefaultDrmSessionManager
relies on being able to do something between instantiation and
the DrmSession starting to open the session. In practice this
doesn't really matter, since DrmSessions will be obtained via the
manager, which does increment thee reference count to 1 to be
consistent with how ExoMediaDrm acquisition works.

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Issue: #6641
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Issue:#4867
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SSA spec allows the lines in any order, so they must all have an end time:
http://moodub.free.fr/video/ass-specs.doc

The Matroska write-up of SubRip assumes the end time is present:
https://matroska.org/technical/specs/subtitles/srt.html

This will massively simplify merging issue:#6595

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The handling of times wasn't really clear to me, hopefully this more
exhaustive documentation helps a bit.

Also assert the end timecode is the 'correct' length for the format.

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More information:
https://docs.google.com/document/d/16tpK6aXqN68PvTyvt4siM-m7f0NXi_8xEeitLDzr8xY/edit?usp=sharing
Tested:
    TAP --sample ran all affected tests and none failed
    http://test/OCL:279845168:BASE:279870402:1573537714395:80ca701c
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*** Original commit ***

Add CRC-8 method in Util

***

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Use the maximum frame size as the maximum sample size if provided.

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Issue: #6636
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