SDK / exoplayer

This ensures we have full test coverage for proguard configs now.
The only configs not covered by tests are:
 - IMA and OkHttp which copy recommended configs from the respective
   library. I couldn't reproduce failures by removing them (and thus
   couldn't write a test that ensures they are correct).
 - Some dontwarn lines that just suppress warnings.

In addition, this change fixes a couple of related issues:
 - Moved AV1 proguard config to correct module.
 - Removed mentioning of deprecated ExtractorMediaSource from README
 - Suppressed warning from IMA code that prevent proguarding under
   strict rules
 - Fixed wrong proguard exclusion in VP9 module.
 - Moved FLAC exclusion (DefaultExtractorsFactory) to correct module.
 - Added AlertDialog suppression for de-jetified code.
 - Removed unusued dependency from UI module that causes large APK
   size increase.

#exofixit
#minor-release

PiperOrigin-RevId: 344427532

- Retire YouTube streams. They're flaky (e.g., one of them has transformed into
  an audio only stream!). There is also a desire for us to stop relying on special
  non-expiring YouTube URLs.
- Reorganize the remaining streams.

PiperOrigin-RevId: 344421031

PiperOrigin-RevId: 344420436

Previously the PlaybackStatsListener needed to handle all events
individually, which required to keep some state of the player and
to resolve potentially transient state changes.

Using onEvents allows to channel all simultanous updates through
one method so that no transient player state and other
inconsistencies need to be handled. This makes the logic easier
to read.

In addition it also allows to resolve all simultaneous events to
use one EventTime (with one timestamp).

#exofixit

PiperOrigin-RevId: 344415459

#exofixit

PiperOrigin-RevId: 344414313

Instead of ffmpeg_jni for consistency with other extensions.

PiperOrigin-RevId: 344411014

PiperOrigin-RevId: 344408351

PiperOrigin-RevId: 344384426

PiperOrigin-RevId: 344310640

PiperOrigin-RevId: 344309747

Also make compilation automatically determine the number of
threads to use during compilation.

PiperOrigin-RevId: 344264761

#exofixit

PiperOrigin-RevId: 344246408

PiperOrigin-RevId: 344243929

This is simpler than instantiating a single-element string array for
every parameter.

#exofixit

PiperOrigin-RevId: 344237475

#exofixit

PiperOrigin-RevId: 344232362

Issue: #8239

#exofixit
#minor-release

PiperOrigin-RevId: 344211877

In many cases it doesn't matter for the test itself how many windows
a timeline has, or even how the timeline of a MediaSource looks like.

And since we introduced the MediaItem-based APIs, single-window
Timelines are the only fully supported Timelines. Thus there is no
point in specifiying this explicitly.

Using these assumptions, we can remove some boilerplate when setting
up standard FakeTimelines or FakeMediaSources with a standard
FakeTimeline.

#exofixit

PiperOrigin-RevId: 344210395

#exofixit
Issue: #5602
PiperOrigin-RevId: 344093622

The current code creates placeholder metadata elements if there is no
static metadata. This causes onStaticMetadataChanged callbacks even
if there is no metadata.

Instead, we can keep the empty list as the static metadata is already
documented to be an empty list if the metadata is unavailable.

#exofixit

PiperOrigin-RevId: 344071639

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PiperOrigin-RevId: 344065556

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PiperOrigin-RevId: 344065519

The ref'd issue was marked as a doucmentation candidate, but I think
the confusion likely arises from the lack of "next" and "previous" in
the method names. Our other UI components also support enabling each
button individually, so this also brings notifications in line with
those.

Issue: #6491
#exofixit
PiperOrigin-RevId: 344058969

PiperOrigin-RevId: 344057097

* These grouping parentheses are unnecessary; it is unlikely the code will be misinterpreted without them
  (see http://go/bugpattern/UnnecessaryParentheses) (2 times)

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This CL was generated by CL Robot - a tool that cleans up code findings
(go/clrobot). The affected code paths have been enabled for CL Robot in //depot/google3/java/com/google/android/libraries/exoplayer/METADATA which is reachable following include_presubmits from //depot/google3/third_party/java_src/android_libs/exoplayer/METADATA.
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#codehealth

PiperOrigin-RevId: 344053269

#exofixit

PiperOrigin-RevId: 344052500

#minor-release

PiperOrigin-RevId: 344051610

PiperOrigin-RevId: 344051289

These tests appear not to need an activity, and removing it means we don't need
to switch away from the deprecated `ActivityTestRule`.

#exofixit

PiperOrigin-RevId: 344037927

#exofixit

PiperOrigin-RevId: 344031062

- Remove restriction on `AdsMediaSource`s in playlists in `ExoPlayerImpl`.
- Allow playing playlists of `AdsMediaSource`s in the demo app.
- Add a sample with ads in a playlist in the demo app.

Issue: #3750
PiperOrigin-RevId: 344018774

Null check warning was reported by //java/com/google/android/apps/gsa/staticplugins/silk/silkcast:silkcast_nullness_checker

//third_party/java_src/android_libs/exoplayer/v2/extensions/media2/src/main:library_nullness_test

PiperOrigin-RevId: 343939763

*** Original commit ***

Suppress warnings in preparation for Checker Framework 3.7.1 upgrade.

LSC: go/checker-lsc

Tested:
    TAP train for global presubmit queue
    http://test/OCL:342788973:BASE:342817196:1605636478036:6c558c0c

***

PiperOrigin-RevId: 343895651

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PiperOrigin-RevId: 343882631

Issue: #3750
PiperOrigin-RevId: 343878310

#exofixit

PiperOrigin-RevId: 343871061

#exofixit

PiperOrigin-RevId: 343857564

This saves a few lines of code and is nicer. We already did make sure to update the notification only once by posting because of b/145521438.

#exofixit

PiperOrigin-RevId: 343852256

Don't refer to the "system's default charset", just specify UTF-8
explicitly.

PiperOrigin-RevId: 343839878

#exofixit

PiperOrigin-RevId: 343821736