As part of migrating native binder services to AIDL, this moves IPlayer.aidl to
the frameworks/av/ project and links in the new AIDL generated binder library to
the JNI libraries.
Test: run cts --module CtsMediaTestCases
Bug: 64223827
Change-Id: I7e346a471b98c78ceb35dceed9e6c0df1000cfb1
Previously only accessible from native.
Also improve documentation and comments.
Test: CTS VolumeShaperTest, Ducking
Bug: 38353147
Change-Id: I27bb34f0a5d28f80d138111bbeeb92653b5195c5
The VolumeShaper is used to apply a volume
envelope to an AudioTrack or a MediaPlayer.
Test: CTS
Bug: 30920125
Bug: 31015569
Change-Id: If8b4bed29760aa3bd15a4b54cae60e40b4f518ee