SDK / exoplayer

LSC: https://docs.google.com/document/d/16tpK6aXqN68PvTyvt4siM-m7f0NXi_8xEeitLDzr8xY/edit?usp=sharing

TESTED=NA
BEGIN_PUBLIC/END_PUBLIC
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From https://github.com/androidx/media/pull/127/files

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on which the video is rendered.

Design Doc: go/aaos-mu-media-dd

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Notification buttons for next/previous should change based on the new index of the currently played media item after another media item is added or removed from a playlist.

Issue: androidx/media#130
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If there's an @param javadoc tag in a supertype then all overrides
of this method that don't also override the javadoc must use the same
parameter name.

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Remove static imports to constants and imports to intdefs, to make the
code more readable.

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Public methods may only refer to public types in their signature. This
change ensures that by switching to a public supertype everywhere.

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Not sure what BUILD.ID the fix will first be applied on though.

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* Add `Listener` in `MediaSession` with method `onNotificationRefreshRequired(MediaSession)`.
* Add `MediaSessionService` as the listener of the `MediaSession` when `MediaSession` is added to `MediaSessionService`
* Load bitmap when update metadata in `MediaSessionLegacyStub` and call `onNotificationRefreshRequired` when bitmap asynchronously arrives.

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If an app sets a compileSdkVersion that is lower than the one used to
create AARs of its dependencies, the build process may produce invalid
outputs, for example by stripping methods from the APK that are only
called when the app is running on a new API version.

To avoid this issue, we can enforce that the compileSdk of apps or
libraries depending on ExoPlayer/Media3 is at least the same as the
one we used for compilation when creating the AAR.

Issue: google/ExoPlayer#10684
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#minor-release

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#minor-release

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This root extra needs to be set by apps manually in media1 and we
can do that automatically in Media3 based on the available session
commands.

#minor-release

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In Media3 there is the useful concept of connection hints that a
client can set when building the session and that are sent to the
service and passed to the `Callback.onConnect()` method when the
browser connects.

These connection hints are then included in the `ControllerInfo`
object that later will be passed to every callback method and the
implementor can then take decisions specific to these connection
hints.

These connection hints are not available in media1. However, when
an app creates a `MediaBrowserCompat` object, the constructor takes
a rootHint object that is sent to
`MediaBrowserServiceCompat.onGetRoot()`.

This change uses the browser rootHints as the connection hints when
creating the `ControllerInfo` for legacy browsers and makes them
available to the `MediaLibrarySession.Callback` domain methods in
the same way as connection hints of a Media3 browser.

PiperOrigin-RevId: 484220748

This change makes adding ad events in live streams more robust by allowing ad
groups to grow in number of ads if more ad events are received than initially
announced by the SDK.

With the IMA prefetch feature, an AdPod can grow in size in certain conditions
like from initially 2 ads to 4 ads being part of the ad group. With this change,
if an additional ad event arrives while the ad group is still being played,
the ad group is expanded. If the event arrives late and the ad group is already
completed, a new group is created for the remaining ads.

This also covers the case where we join the live stream while an ad is being
played and we missed at least one LOADED event from the SDK. Ads of the group
before the first LOADED event are ignored in such a case.

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This allows to throw when the Transformer is stuck or is too slow.

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From ANSI-CTA-608-E R-2014 section 8.4:
> When closed captioning is used on line 21, field 2, it shall conform
> to all of the applicable specifications and recommended practices as
> defined for field 1 services with the following differences:
> 1. The non-printing character of the miscellaneous control-character
>    pairs that fall in the range of 0x14, 0x20 to 0x14, 0x2F in field 1,
>    shall be replaced with 0x15, 0x20 to 0x15, 0x2F when used in field
>    2.
> 2. The non-printing character of the miscellaneous control-character
>    pairs that fall in the range of 0x1C, 0x20 to 0x1C, 0x2F in field
>    1, shall be replaced with 0x1D, 0x20 to 0x1D, 0x2F when used in
>    field 2.

This basically means that `cc1=0x15` in field 2 should be interpreted as
`cc1=0x14` in field 1, and same for `0x1D -> 0x1C`.

The `isMiscCode`  method above already handles this by ignoring the LSB
(the only difference between `0x14` and `0x15`, and `0x1C` and `0x1D`)
by AND-ing with `0xF6` instead of `0xF7`. This change uses the same
trick in `isServiceSwitchCommand`.

Issue: google/ExoPlayer#10666
#minor-release
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Split inner interface into separate file, which will go in common
module. The old interface will be deprecated and extends the new.

#cleanup

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* Add `BitmapLoader` in `MediaSession.Builder` and `MediaLibrarySession.Builder`.
* Pass `BitmapLoader` into the constructor of `MediaSession`, `MediaSessionImpl`, `MediaLibrarySession` and `MediaLibrarySessionImpl`.
* Add an interface method `loadBitmapFromMetadata(MediaMetadata)` in `BitmapLoader`.
* Remove the reference of `BitmapLoader` in `DefaultMediaNotificationProvider`.

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The inner class avoids a verification failure, which can lead to slower
execution at runtime.

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This is a no-op, but it's more 'correct' because it avoids any potential
sign mix-ups that come from storing an unsigned byte (with a
potentially set MSB) in a signed java byte variable.

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Although it can be useful to check the output format, it's not required or needed.

For some AudioProcessor implementations, it is stated/obvious that
the output format will match the input, in which case there is no
a need to check the return value.

#cleanup

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Also used all-caps consistently

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* Add `CacheBitmapLoader`.
* Add `CacheBitmapLoaderTest`.
* Remove the `BitmapLoadRequest` and some bitmap caching logic in `DefaultMediaNotificationProvider` since we moved all of them in `CacheBitmapLoader`.
* Modify `DefaultMediaNotificationProviderTest`.

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