SDK / exoplayer

Simplifying and clarifying variables, and adding comments.

Tested by confirming demo-gl and demo-transformer both
correctly display videos

PiperOrigin-RevId: 421792079

This value is the default used by widevine_test at
proxy.uat.widevine.com, but it's not easy to find that info so it's
clearer to document it explicitly here for consistency with the "policy
tests" section below where all the URLs contain a video_id parameter.

Issue: google/ExoPlayer#9852
PiperOrigin-RevId: 421781663

This string is case-sensitive.

PiperOrigin-RevId: 421781437

The existing wording would be correct if prefixed with
"Returns false if [...]", but it seems confusing to a document a boolean
method in terms the condition it returns false - so I reworded it in
terms of when it returns true.

#minor-release

PiperOrigin-RevId: 421682584

This is referred to from the public API surface, so it should also be
public: https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/trackselection/MappingTrackSelector.MappedTrackInfo.html#getRendererSupport(int)

#minor-release

PiperOrigin-RevId: 421578232

After this change exceptions throw by MediaCodec during
encoding/decoding will result in TransformationExceptions with
ERROR_CODE_ENCODING_FAILED/ERROR_CODE_DECODING_FAILED.
Before this change ERROR_CODE_FAILED_RUNTIME_CHECK was used.

PiperOrigin-RevId: 421560396

Expected images are taken on emulators, so a larger acceptable
difference from expected images must be accepted on physical devices.

PiperOrigin-RevId: 421543441

PiperOrigin-RevId: 421530365

PiperOrigin-RevId: 421514944

Live speed adjustment is used for all live playback at the moment,
but has no user visible effect if the media is not played with low
latency. To avoid unnecessary adjustment during playback without
benefit, this change restricts the live speed adjustment to cases
where either the user requested a speed value in the MediaItem or the
media specifically defined a low-latency stream.

Issue: google/ExoPlayer#9329
PiperOrigin-RevId: 421514283