Prevent offload underrun during active playback. (8f194f19) · Commits · e / devices / smdk4412 / android_frameworks_av

services/audioflinger/Threads.cpp

+35 −29

Original line number	Diff line number	Diff line
		@@ -5889,6 +5889,20 @@ uint32_t AudioFlinger::PlaybackThread::trackCountForUid_l(uid_t uid) const
		return trackCount;
		}

		bool AudioFlinger::PlaybackThread::checkRunningTimestamp()
		{
		uint64_t position = 0;
		struct timespec unused;
		const status_t ret = mOutput->getPresentationPosition(&position, &unused);
		if (ret == NO_ERROR) {
		if (position != mLastCheckedTimestampPosition) {
		mLastCheckedTimestampPosition = position;
		return true;
		}
		}
		return false;
		}

		// isTrackAllowed_l() must be called with ThreadBase::mLock held
		bool AudioFlinger::MixerThread::isTrackAllowed_l(
		audio_channel_mask_t channelMask, audio_format_t format,
		@@ -6317,10 +6331,14 @@ AudioFlinger::PlaybackThread::mixer_state AudioFlinger::DirectOutputThread::prep
		// fill a buffer, then remove it from active list.
		// Only consider last track started for mixer state control
		if (--(track->mRetryCount) <= 0) {
		const bool running = checkRunningTimestamp();
		if (running) { // still running, give us more time.
		track->mRetryCount = kMaxTrackRetriesOffload;
		} else {
		ALOGV("BUFFER TIMEOUT: remove track(%d) from active list", trackId);
		tracksToRemove->add(track);
		// indicate to client process that the track was disabled because of underrun;
		// it will then automatically call start() when data is available
		// indicate to client process that the track was disabled because of
		// underrun; it will then automatically call start() when data is available
		track->disable();
		// only do hw pause when track is going to be removed due to BUFFER TIMEOUT.
		// unlike mixerthread, HAL can be paused for direct output
		@@ -6331,6 +6349,7 @@ AudioFlinger::PlaybackThread::mixer_state AudioFlinger::DirectOutputThread::prep
		doHwPause = true;
		mHwPaused = true;
		}
		}
		} else if (last) {
		mixerStatus = MIXER_TRACKS_ENABLED;
		}
		@@ -6540,6 +6559,7 @@ void AudioFlinger::DirectOutputThread::cacheParameters_l()

		void AudioFlinger::DirectOutputThread::flushHw_l()
		{
		PlaybackThread::flushHw_l();
		mOutput->flush();
		mHwPaused = false;
		mFlushPending = false;
		@@ -6675,8 +6695,7 @@ void AudioFlinger::AsyncCallbackThread::setAsyncError()
		AudioFlinger::OffloadThread::OffloadThread(const sp<AudioFlinger>& audioFlinger,
		AudioStreamOut* output, audio_io_handle_t id, bool systemReady)
		: DirectOutputThread(audioFlinger, output, id, OFFLOAD, systemReady),
		mPausedWriteLength(0), mPausedBytesRemaining(0), mKeepWakeLock(true),
		mOffloadUnderrunPosition(~0LL)
		mPausedWriteLength(0), mPausedBytesRemaining(0), mKeepWakeLock(true)
		{
		//FIXME: mStandby should be set to true by ThreadBase constructo
		mStandby = true;
		@@ -6893,19 +6912,7 @@ AudioFlinger::PlaybackThread::mixer_state AudioFlinger::OffloadThread::prepareTr
		// No buffers for this track. Give it a few chances to
		// fill a buffer, then remove it from active list.
		if (--(track->mRetryCount) <= 0) {
		bool running = false;
		uint64_t position = 0;
		struct timespec unused;
		// The running check restarts the retry counter at least once.
		status_t ret = mOutput->stream->getPresentationPosition(&position, &unused);
		if (ret == NO_ERROR && position != mOffloadUnderrunPosition) {
		running = true;
		mOffloadUnderrunPosition = position;
		}
		if (ret == NO_ERROR) {
		ALOGVV("underrun counter, running(%d): %lld vs %lld", running,
		(long long)position, (long long)mOffloadUnderrunPosition);
		}
		const bool running = checkRunningTimestamp();
		if (running) { // still running, give us more time.
		track->mRetryCount = kMaxTrackRetriesOffload;
		} else {
		@@ -6976,7 +6983,6 @@ void AudioFlinger::OffloadThread::flushHw_l()
		mPausedBytesRemaining = 0;
		// reset bytes written count to reflect that DSP buffers are empty after flush.
		mBytesWritten = 0;
		mOffloadUnderrunPosition = ~0LL;

		if (mUseAsyncWrite) {
		// discard any pending drain or write ack by incrementing sequence

services/audioflinger/Threads.h

+10 −6

Original line number	Diff line number	Diff line
		@@ -1376,6 +1376,14 @@ protected:
		struct audio_patch mDownStreamPatch;

		std::atomic_bool mCheckOutputStageEffects{};

		// A differential check on the timestamps to see if there is a change in the
		// timestamp frame position between the last call to checkRunningTimestamp.
		uint64_t mLastCheckedTimestampPosition = ~0LL;

		bool checkRunningTimestamp();

		virtual void flushHw_l() { mLastCheckedTimestampPosition = ~0LL; }
		};

		class MixerThread : public PlaybackThread {
		@@ -1493,7 +1501,7 @@ public:
		virtual bool checkForNewParameter_l(const String8& keyValuePair,
		status_t& status);

		virtual void flushHw_l();
		void flushHw_l() override;

		void setMasterBalance(float balance) override;

		@@ -1558,7 +1566,7 @@ public:
		OffloadThread(const sp<AudioFlinger>& audioFlinger, AudioStreamOut* output,
		audio_io_handle_t id, bool systemReady);
		virtual ~OffloadThread() {};
		virtual void flushHw_l();
		void flushHw_l() override;

		protected:
		// threadLoop snippets
		@@ -1575,10 +1583,6 @@ private:
		size_t mPausedWriteLength; // length in bytes of write interrupted by pause
		size_t mPausedBytesRemaining; // bytes still waiting in mixbuffer after resume
		bool mKeepWakeLock; // keep wake lock while waiting for write callback
		uint64_t mOffloadUnderrunPosition; // Current frame position for offloaded playback
		// used and valid only during underrun. ~0 if
		// no underrun has occurred during playback and
		// is not reset on standby.
		};

		class AsyncCallbackThread : public Thread {