am 7ed7668b: Merge "Calculate audio media drift time from AudioSource" into gingerbread (bb64e554) · Commits · e / os / android_frameworks_base

include/media/stagefright/AudioSource.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -72,6 +72,7 @@ private:
		int64_t mPrevSampleTimeUs;
		int64_t mTotalLostFrames;
		int64_t mPrevLostBytes;
		int64_t mInitialReadTimeUs;

		MediaBufferGroup *mGroup;

include/media/stagefright/MPEG4Writer.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -132,7 +132,7 @@ private:
		// Adjust other track media clock (presumably wall clock)
		// based on audio track media clock with the drift time.
		int64_t mDriftTimeUs;
		void addDriftTimeUs(int64_t driftTimeUs);
		void setDriftTimeUs(int64_t driftTimeUs);
		int64_t getDriftTimeUs();

		void lock();

include/media/stagefright/MetaData.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -48,6 +48,7 @@ enum {
		kKeyTime = 'time', // int64_t (usecs)
		kKeyNTPTime = 'ntpT', // uint64_t (ntp-timestamp)
		kKeyTargetTime = 'tarT', // int64_t (usecs)
		kKeyDriftTime = 'dftT', // int64_t (usecs)
		kKeyDuration = 'dura', // int64_t (usecs)
		kKeyColorFormat = 'colf',
		kKeyPlatformPrivate = 'priv', // pointer

media/libstagefright/AudioSource.cpp

+12 −3

Original line number	Diff line number	Diff line
		@@ -84,6 +84,7 @@ status_t AudioSource::start(MetaData *params) {

		mTrackMaxAmplitude = false;
		mMaxAmplitude = 0;
		mInitialReadTimeUs = 0;
		mStartTimeUs = 0;
		int64_t startTimeUs;
		if (params && params->findInt64(kKeyTime, &startTimeUs)) {
		@@ -210,6 +211,7 @@ status_t AudioSource::read(
		return NO_INIT;
		}

		int64_t readTimeUs = systemTime() / 1000;
		*out = NULL;

		MediaBuffer *buffer;
		@@ -223,9 +225,10 @@ status_t AudioSource::read(


		if (numFramesRecorded == 0 && mPrevSampleTimeUs == 0) {
		mInitialReadTimeUs = readTimeUs;
		// Initial delay
		if (mStartTimeUs > 0) {
		mStartTimeUs = systemTime() / 1000 - mStartTimeUs;
		mStartTimeUs = readTimeUs - mStartTimeUs;
		} else {
		// Assume latency is constant.
		mStartTimeUs += mRecord->latency() * 1000;
		@@ -271,7 +274,10 @@ status_t AudioSource::read(
		}
		memset(buffer->data(), 0, numLostBytes);
		buffer->set_range(0, numLostBytes);
		buffer->meta_data()->setInt64(kKeyTime, mPrevSampleTimeUs);
		if (numFramesRecorded == 0) {
		buffer->meta_data()->setInt64(kKeyTime, mStartTimeUs);
		}
		buffer->meta_data()->setInt64(kKeyDriftTime, readTimeUs - mInitialReadTimeUs);
		mPrevSampleTimeUs = timestampUs;
		*out = buffer;
		return OK;
		@@ -309,7 +315,10 @@ status_t AudioSource::read(
		trackMaxAmplitude((int16_t *) buffer->data(), n >> 1);
		}

		buffer->meta_data()->setInt64(kKeyTime, mPrevSampleTimeUs);
		if (numFramesRecorded == 0) {
		buffer->meta_data()->setInt64(kKeyTime, mStartTimeUs);
		}
		buffer->meta_data()->setInt64(kKeyDriftTime, readTimeUs - mInitialReadTimeUs);
		CHECK(timestampUs > mPrevSampleTimeUs);
		mPrevSampleTimeUs = timestampUs;
		LOGV("initial delay: %lld, sample rate: %d, timestamp: %lld",

media/libstagefright/MPEG4Writer.cpp

+9 −20

Original line number	Diff line number	Diff line
		@@ -1430,9 +1430,6 @@ status_t MPEG4Writer::Track::threadEntry() {
		int64_t previousPausedDurationUs = 0;
		int64_t timestampUs;

		int64_t wallClockTimeUs = 0;
		int64_t lastWallClockTimeUs = 0;

		sp<MetaData> meta_data;
		bool collectStats = collectStatisticalData();

		@@ -1542,14 +1539,15 @@ status_t MPEG4Writer::Track::threadEntry() {
		// of neighboring samples. This in turn helps reduce the track header size,
		// especially, the number of entries in the "stts" box.
		if (mNumSamples > 1) {
		int64_t durationUs = timestampUs + mOwner->getDriftTimeUs() - lastTimestampUs;
		int64_t currDriftTimeUs = mOwner->getDriftTimeUs();
		int64_t durationUs = timestampUs + currDriftTimeUs - lastTimestampUs;
		int64_t diffUs = (durationUs > lastDurationUs)
		? durationUs - lastDurationUs
		: lastDurationUs - durationUs;
		if (diffUs <= 5000) { // XXX: Magic number 5ms
		timestampUs = lastTimestampUs + lastDurationUs;
		} else {
		timestampUs += mOwner->getDriftTimeUs();
		timestampUs += currDriftTimeUs;
		}
		}
		}
		@@ -1557,12 +1555,6 @@ status_t MPEG4Writer::Track::threadEntry() {
		if (mNumSamples > 1) {
		if (timestampUs <= lastTimestampUs) {
		LOGW("Frame arrives too late!");
		#if 0
		// Drop the late frame.
		copy->release();
		copy = NULL;
		continue;
		#else
		// Don't drop the late frame, since dropping a frame may cause
		// problems later during playback

		@@ -1573,7 +1565,6 @@ status_t MPEG4Writer::Track::threadEntry() {
		} else {
		timestampUs = lastTimestampUs + (1000000LL + (mTimeScale >> 1)) / mTimeScale;
		}
		#endif
		}
		}

		@@ -1613,12 +1604,10 @@ status_t MPEG4Writer::Track::threadEntry() {
		lastDurationTicks = currDurationTicks;
		lastTimestampUs = timestampUs;
		if (mIsRealTimeRecording && mIsAudio) {
		wallClockTimeUs = systemTime() / 1000;
		int64_t wallClockDurationUs = wallClockTimeUs - lastWallClockTimeUs;
		if (mNumSamples > 2) {
		mOwner->addDriftTimeUs(lastDurationUs - wallClockDurationUs);
		int64_t driftTimeUs = 0;
		if (meta_data->findInt64(kKeyDriftTime, &driftTimeUs)) {
		mOwner->setDriftTimeUs(driftTimeUs);
		}
		lastWallClockTimeUs = wallClockTimeUs;
		}

		if (isSync != 0) {
		@@ -1851,10 +1840,10 @@ void MPEG4Writer::Track::logStatisticalData(bool isAudio) {
		}
		}

		void MPEG4Writer::addDriftTimeUs(int64_t driftTimeUs) {
		LOGV("addDriftTimeUs: %lld us", driftTimeUs);
		void MPEG4Writer::setDriftTimeUs(int64_t driftTimeUs) {
		LOGV("setDriftTimeUs: %lld us", driftTimeUs);
		Mutex::Autolock autolock(mLock);
		mDriftTimeUs += driftTimeUs;
		mDriftTimeUs = driftTimeUs;
		}

		int64_t MPEG4Writer::getDriftTimeUs() {