SDK / exoplayer

This change splits AdvancedFrameProcessor into 4 files:
- MatrixTransformationFrameProcessor for the GlFrameProcessor
  implementation
- MatrixTransformation and GlMatrixTransformation for the GlEffect
  specification
- MatrixUtils for the static matrix helpers

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*** Original commit ***

Upgrade Robolectric dependency to 4.8

***

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Some APIs from Android 12L were used either via reflection or
constants values were hard-coded. We can now use these APIs directly
since we upgraded the compile SDK version to 32.

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It's reasonable to serialize this type to support backgrounding
use-cases, as demonstrated by the main demo app.

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This is used from the main demo app.

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This ensures that both content and licenses are requested using the
same HTTP stack.

#minor-release

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Also add warning for what can happen if this is ignored.

Previously the return value was overridden by setOutputSurface, now
setOutputSurface only overrides the values using internally.

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Developers are expected to (eventually) only use methods on
PlayerView (and not PlayerControlView) to interact with the UI
controller.

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This is consistent with the IntDef name, and frees up the CONTENT_TYPE_
prefix for the @ContentType values (which are currently just TYPE_*,
and therefore ambiguous with lots of other 'type' values in C).

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This method was introduced in https://github.com/google/ExoPlayer/commit/754eb1527af9ff4211b7e164d2af6b46530f328c
as a replacement for Util.inferContentType(String) but it incorrectly
didn't return TYPE_SS when passed "ism" or "isml".

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* Add a /* paramName= */ comment
* Remove an unnecessary comma.
* Remove extra "internal " for a b/### link

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The old video has a `irregular' resolution of 1080x720. Change to a 1920x1080
video.

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Change test name prefix from `transform` to `transcode` for consistency.

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We add an entire class like we do for parsing other codec initialization formats; it's currently not doing any parsing though (... initialization data is really simple for AV1 though: just the entire contents of the box).

For testing, we add the sample file, having been re-encoded with ffmpeg (and we also happen to have another av1 file, too).

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The parameter was removed in a previous CL but wasn't removed
from the javadoc yet.

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Issue: google/ExoPlayer#10049
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This fixes some small niggles:
1. `inferContentType(String)` is documented to take a path, but in the
   tests we're passing full URIs.
2. A `String` parameter is usually a path, but also a MIME type or an
   extension. In the new methods, the meaning of a `String` parameter
   is always clear from the name of the method.
3. `inferContentType(String)` is always passed an extension in
   'production' code (which has to be manually prefixed with a dot).
4. `inferContentType(Uri, @Nullable String)` always ignores the Uri if
   the String is non-null. IMO this logic is clearer to a reader if it's
   just in-lined at the call-site.

These methods are used from the demo apps, so will be part of the stable
API.

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This can allow apps to test and demonstrate support for videos with
pixelWidthHeightRatio != 1.

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To ensure frame processor operations operate on square pixels,
make the frame taller or wider for non-square input pixels.

In addition to automated tests, this was tested by changing the
inputFormat.pixelWidthHeightRatio in the TransformerVideoRenderer.

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Remove unused saveTestBitmapToCacheDirectory throwOnFailure option.

#cleanup

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This allows the actual bitmap to be saved, even if output
dimensions are different than expected. Otherwise, differing
output dimensions would throw an exception, preventing the bitmap
from being saved.

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30 second clips at higher resolutions are useful for testing encoder
behaviour compared to shorter clips.

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