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/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index f31619b..262d194 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -365,7 +365,9 @@
class PlaybackThread;
class MixerThread;
class DirectOutputThread;
+ class OffloadThread;
class DuplicatingThread;
+ class AsyncCallbackThread;
class Track;
class RecordTrack;
class EffectModule;
@@ -432,6 +434,7 @@
void stop_nonvirtual();
};
+
PlaybackThread *checkPlaybackThread_l(audio_io_handle_t output) const;
MixerThread *checkMixerThread_l(audio_io_handle_t output) const;
RecordThread *checkRecordThread_l(audio_io_handle_t input) const;
@@ -498,11 +501,12 @@
struct AudioStreamOut {
AudioHwDevice* const audioHwDev;
audio_stream_out_t* const stream;
+ audio_output_flags_t flags;
audio_hw_device_t* hwDev() const { return audioHwDev->hwDevice(); }
- AudioStreamOut(AudioHwDevice *dev, audio_stream_out_t *out) :
- audioHwDev(dev), stream(out) {}
+ AudioStreamOut(AudioHwDevice *dev, audio_stream_out_t *out, audio_output_flags_t flags) :
+ audioHwDev(dev), stream(out), flags(flags) {}
};
struct AudioStreamIn {