SDK / exoplayer

The working of libOpus is different from ffmpeg. With ffmpeg, the decoder can
be configured to output floating point PCM. While in libOpus, floating samples
are acquired by calling a different function. This is the reason the new JNI
functions and the logic in OpusDecoder/LibopusAudioRenderer is added to
support float output.

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More information:
https://docs.google.com/a/google.com/document/d/1lzK04DqCZgjOoGQfBT053QIrCvlsyAAwLo0jfqcN6ds/edit?usp=sharing

Tested:
    TAP --sample ran all affected tests and none failed
    http://test/OCL:324422822:BASE:324408434:1596318556672:a8b3beed
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Demo app supports clip start/end points and demonstrates manual
ad insertions.

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This callback was not notified before, which could theoretically lead to ad
loading timing out. In practice it doesn't currently happen because the timeout
appears to start when the ad cue point is reached, not when loadAd is called.

We notify onLoaded when the ad media period is prepared (for HTML5 the
recommendation is to notify on the HTMLMediaElement 'canplay' event, which this
roughly corresponds to).

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Issue: #7677
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Issue: #7244 added this feature to HLS. This change is the exact copy
in ChunkSampleStream to add the same support to the other adaptive
formats.

Note that ChunkSampleStream doesn't support slicing, so we can't cancel
a read-from chunk, and we need to prevent reading into an already
canceled chunk load so that the chunk can be automatically discarded
after the cancelation.

Issue: #2848
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Also add cpu_features to .hgignore.

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The passthrough codec does not propagate
the EOS back to ExoPlayer.

Issue: https://github.com/google/ExoPlayer/issues/7647
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Wrapping MediaCodec ISEs in MediaCodecDecoderException lets us attach
MediaCodecInfo, which contains lots of useful information such as the
MediaCodec name, the codec capabilities, etc.

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Tests playSinglePeriodTimeline and playMultiPeriodTimeline are migrated
to use TestExoplayer.

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*** Original commit ***

Pass startPositionUs into Renderer.replaceStream

Plumb this down into BaseRenderer.onStreamChanged and use it when
deciding whether to render the first frame of a new period.

***

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It's been replaced by getExoMediaCryptoType().

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Issue: #7675
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From Truth docs:
"To test that the iterable contains the same elements as an array,
prefer containsExactlyElementsIn(Object[]). It makes clear that the
given array is a list of elements, not an element itself. This helps
human readers and avoids a compiler warning."
https://truth.dev/api/1.0.1/com/google/common/truth/IterableSubject.html#containsExactly-java.lang.Object...-

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It's potentially confusing that this resets both position & limit, so
require callers to pass `limit` explicitly, or call setPosition(0)
if that's actually what they intended.

This makes enforcing the limit in an upcoming change slightly safer.

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This allows us to enforce the limit because the array can only be
reassigned through reset(byte[]) or reset(byte[], int) (which update
the limit)

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This removes Supplier, Function and Predicate. Consumer is kept because
Guava doesn't have an equivalent (Java 8 does, but we can't use that
yet).

#exofixit

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Also, there was a bug that controls are always shown at the beginning
even when controlview's hide() is called.

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