AudioTrack client fast policy (4a4a0959) · Commits · e / os / android_frameworks_av

include/media/AudioTrack.h

+5 −3

Original line number	Diff line number	Diff line
		@@ -139,13 +139,15 @@ public:
		* latency of the track. The actual size selected by the AudioTrack could be
		* larger if the requested size is not compatible with current audio HAL
		* latency.
		* flags: Reserved for future use.
		* flags: See comments on audio_policy_output_flags_t in <system/audio_policy.h>.
		* cbf: Callback function. If not null, this function is called periodically
		* to request new PCM data.
		* user: Context for use by the callback receiver.
		* notificationFrames: The callback function is called each time notificationFrames PCM
		* frames have been consumed from track input buffer.
		* sessionId: Specific session ID, or zero to use default.
		* threadCanCallJava: Whether callbacks are made from an attached thread and thus can call JNI.
		* If not present in parameter list, then fixed at false.
		*/

		AudioTrack( audio_stream_type_t streamType,

media/libmedia/AudioTrack.cpp

+20 −3

Original line number	Diff line number	Diff line
		@@ -226,7 +226,8 @@ status_t AudioTrack::set(

		// force direct flag if format is not linear PCM
		if (!audio_is_linear_pcm(format)) {
		flags = (audio_policy_output_flags_t) (flags \| AUDIO_POLICY_OUTPUT_FLAG_DIRECT);
		flags = (audio_policy_output_flags_t)
		((flags \| AUDIO_POLICY_OUTPUT_FLAG_DIRECT) & ~AUDIO_POLICY_OUTPUT_FLAG_FAST);
		}

		if (!audio_is_output_channel(channelMask)) {
		@@ -252,6 +253,7 @@ status_t AudioTrack::set(
		mNotificationFramesReq = notificationFrames;
		mSessionId = sessionId;
		mAuxEffectId = 0;
		mCbf = cbf;

		// create the IAudioTrack
		status_t status = createTrack_l(streamType,
		@@ -280,7 +282,6 @@ status_t AudioTrack::set(
		mSharedBuffer = sharedBuffer;
		mMuted = false;
		mActive = false;
		mCbf = cbf;
		mUserData = user;
		mLoopCount = 0;
		mMarkerPosition = 0;
		@@ -762,6 +763,18 @@ status_t AudioTrack::createTrack_l(
		return NO_INIT;
		}

		// Client decides whether the track is TIMED (see below), but can only express a preference
		// for FAST. Server will perform additional tests.
		if ((flags & AUDIO_POLICY_OUTPUT_FLAG_FAST) && !(
		// either of these use cases:
		// use case 1: shared buffer
		(sharedBuffer != 0) \|\|
		// use case 2: callback handler
		(mCbf != NULL))) {
		ALOGW("AUDIO_POLICY_OUTPUT_FLAG_FAST denied");
		flags = (audio_policy_output_flags_t) (flags & ~AUDIO_POLICY_OUTPUT_FLAG_FAST);
		}

		mNotificationFramesAct = mNotificationFramesReq;
		if (!audio_is_linear_pcm(format)) {
		if (sharedBuffer != 0) {
		@@ -786,7 +799,7 @@ status_t AudioTrack::createTrack_l(
		if (mNotificationFramesAct > (uint32_t)frameCount/2) {
		mNotificationFramesAct = frameCount/2;
		}
		if (frameCount < minFrameCount) {
		if (frameCount < minFrameCount && !(flags & AUDIO_POLICY_OUTPUT_FLAG_FAST)) {
		// not ALOGW because it happens all the time when playing key clicks over A2DP
		ALOGV("Minimum buffer size corrected from %d to %d",
		frameCount, minFrameCount);
		@@ -807,6 +820,10 @@ status_t AudioTrack::createTrack_l(
		if (mIsTimed) {
		trackFlags \|= IAudioFlinger::TRACK_TIMED;
		}
		if (flags & AUDIO_POLICY_OUTPUT_FLAG_FAST) {
		trackFlags \|= IAudioFlinger::TRACK_FAST;
		}

		sp<IAudioTrack> track = audioFlinger->createTrack(getpid(),
		streamType,
		sampleRate,