Fix issue 2304701: Media streams can remain muted on A2DP output.
The problem comes from the fact that when a notification is played on both headsets + speaker,
the media strategy is muted. It is only unmuted when a new device is selected on hardwate output
(for instance headset only when music starts).
If an A2DP output is created while music is muted, AudioFlinger with use the last value received
for music volume to initialize the music stream volume on the newly created A2DP output, which in
this case is 0. The code in audio policy manager that applies stream volumes after the A2DP output
has been created is inefficient here, because as music stream is muted, the request to change the
volume is ignored.
As next time music starts it is now played over A2DP output and not on HW output,
no device modification is done on HW output and the music streams remains muted.
This is also applicatble to SYSTEM and TTS streams.
The fix consists in keeping a stream mute count on each output separately instead of a global stream mute count.
Thus when the music volume is re applied after A2DP output creation, the request is not ignored as the music stream is not
muted on A2DP output.
2 files changed