AudioFlinger: offload playback, non-blocking write
- Added specialized playback thread class for offload playback,
derived from directoutput thread.
This thread type handles specific state transitions for offloaded
tracks and offloading commands (pause/resume/drain/flush..) to audio HAL.
As opposed to other threads, does not go to standby if the track is paused.
- Added support for asynchronous write and drain operations at audio HAL.
Use a thread to handle async callback events from HAL: this avoids locking
playback thread mutex when executing the callback and cause deadlocks when
calling audio HAL functions with the playback thread mutex locked.
- Better accouting for track activity: call start/stop and release Output
methods in audio policy manager when tracks are actually added and removed
from the active tracks list.
Added a command thread in audio policy service to handle stop/release commands
asynchronously and avoid deadlocks with playback thread.
- Track terminated status is not a state anymore. This condition is othogonal
to state to permitted state transitions while terminated.
Change-Id: Id157f4b3277620568d8eace7535d9186602564de
diff --git a/services/audioflinger/PlaybackTracks.h b/services/audioflinger/PlaybackTracks.h
index b1286d3..8b7433c 100644
--- a/services/audioflinger/PlaybackTracks.h
+++ b/services/audioflinger/PlaybackTracks.h
@@ -51,6 +51,8 @@
audio_stream_type_t streamType() const {
return mStreamType;
}
+ bool isOffloaded() const { return (mFlags & IAudioFlinger::TRACK_OFFLOAD) != 0; }
+ status_t setParameters(const String8& keyValuePairs);
status_t attachAuxEffect(int EffectId);
void setAuxBuffer(int EffectId, int32_t *buffer);
int32_t *auxBuffer() const { return mAuxBuffer; }
@@ -68,6 +70,7 @@
friend class PlaybackThread;
friend class MixerThread;
friend class DirectOutputThread;
+ friend class OffloadThread;
Track(const Track&);
Track& operator = (const Track&);
@@ -142,6 +145,7 @@
// barrier, but is read/written atomically
bool mIsInvalid; // non-resettable latch, set by invalidate()
AudioTrackServerProxy* mAudioTrackServerProxy;
+ bool mResumeToStopping; // track was paused in stopping state.
}; // end of Track
class TimedTrack : public Track {