71c4496a97
This problem due to the way audio buffers are mixed when low power mode is active was addressed by commits 19ddf0eb and 8a04fe03 but only partially. As a matter of fact, when more than one audio track is playing, the problem is still present. This is most noticeable when playing music with screen off and a notification or navigation instruction is played: in this case, the music or notification is likely to skip. The fix consists in declaring the mixer ready if all active tracks are ready. Previous behavior was to declare ready if at least one track was ready. To avoid that one application failing to fill the track buffer blocks other tracks indefinitely, this condition is respected only if the mixer was ready in the previous round. Issue 5799167. Change-Id: Iabd4ca08d3d45f563d9824c8a03c2c68a43ae179