SDK / exoplayer

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I could do this with nullSafeArrayConcat but this saves allocating a throw-away
single-element array.

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If a surface was previously passed to the player then an output buffer
renderer was set, we would remove surface callbacks but not clear the
surface on renderers that accept MSG_SET_SURFACE.

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Add a javadoc explanation for ProgressiveDownloader that explains that it tries to skip downloading already cached bytes.

download calls through to CacheUtil#cache, which handles skipping already downloaded bytes.

It is useful for callers to know that ProgressiveDownloader has this behavior - otherwise, they might reimplement the logic themselves.

I hope this behavior is something that can be part of the public API :)

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This is useful for apps that want to access HDR metadata that MediaCodec puts
in its output format.

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This is a proof of concept for cleanup we should do for all of
our DataSource implementations as we move toward stabilizing
parts of the API.

- Move all XDataSourceFactory classes to be inner classes.
- Remove chained constructors for XDataSourceFactory classes. Keep
  required args going through constructors. Use setters for the
  rest.
- Not applicable in this case, but we probably want to deprecate
  all but the no-arg method for instantiating eac XDataSource
  instance (with the all-arg method kept but with the intention
  of making it package private).

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Issue: #6523
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- Verifies that playWhenReady doesn't become true if audio focus
  is denied.
- Also verifies there's no suppression reason in this case, because
  the denial is permanent rather than temporary.

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Also removed "to be executed" from all the comments, since it
didn't seem to add value.

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It's documented to be for temporary loss only (i.e. the case where
externally reported playWhenReady is still true)

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Currently, ndk cpu-features is being used.
This is now deprecated and google open-source
cpu_features library is recommended.

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Issue: #3353
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This supports both chunkless & traditional preparation

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If a user has checked out libgav1 they almost certainly want to
build the extension, so fail if CMake is not present but
libgav1 is present. Also add a note to the README linking to
instructions for installing CMake.

Also remove the NDK check, as ndk.dir is apparently deprecated
and Android Studio appears to install this automatically anyway.

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When the user calls setRepeatMode, the state modifications are
observed as immediate, in spite of being sent to the receiver app
as asynchronous operations.

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Also move the masking internal state update before the message
dispatch, so as to ensure the result of the operation prevails
over the masking state.

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Playback cannot be suppressed if playWhenReady=false

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The limit of this.supplementalData was not reset.

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This doesn't offer anything on top of the functionality in the main demo app.
There's less code but we have a blog post and presentations that walk through
how to use the extension, so it seems fine to delete the code so we don't need
to maintain it. This also avoids potential confusion about what the demo app
means on IMA-related GitHub issues.

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