AudioSystem: add API to query audio HW sync source
Add a method to query from the audio HAL the HW sync
source used for a given audio session.
Modify audio policy to select a direct output with HW sync
when requested.
Bug: 16132368.
Change-Id: I03038f9188f2d389f8a5fd76a671854013a4513e
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index b8cc33a..1f77b2f 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -1579,6 +1579,25 @@
return NO_ERROR;
}
+audio_hw_sync_t AudioFlinger::getAudioHwSyncForSession(audio_session_t sessionId)
+{
+ Mutex::Autolock _l(mLock);
+ for (size_t i = 0; i < mPlaybackThreads.size(); i++) {
+ sp<PlaybackThread> thread = mPlaybackThreads.valueAt(i);
+ if ((thread->hasAudioSession(sessionId) & ThreadBase::TRACK_SESSION) != 0) {
+ // A session can only be on one thread, so exit after first match
+ String8 reply = thread->getParameters(String8(AUDIO_PARAMETER_STREAM_HW_AV_SYNC));
+ AudioParameter param = AudioParameter(reply);
+ int value;
+ if (param.getInt(String8(AUDIO_PARAMETER_STREAM_HW_AV_SYNC), value) == NO_ERROR) {
+ return value;
+ }
+ break;
+ }
+ }
+ return AUDIO_HW_SYNC_INVALID;
+}
+
// ----------------------------------------------------------------------------
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 31c5a1a..4e9d49b 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -248,6 +248,9 @@
/* Set audio port configuration */
virtual status_t setAudioPortConfig(const struct audio_port_config *config);
+ /* Get the HW synchronization source used for an audio session */
+ virtual audio_hw_sync_t getAudioHwSyncForSession(audio_session_t sessionId);
+
virtual status_t onTransact(
uint32_t code,
const Parcel& data,