Add support for MPEG editlist gapless info (0a69bd28) · Commits · e / os / android_frameworks_av

media/libstagefright/MPEG4Extractor.cpp

+61 −0

Original line number	Diff line number	Diff line
		@@ -817,6 +817,7 @@ status_t MPEG4Extractor::parseChunk(off64_t *offset, int depth) {
		case FOURCC('i', 'l', 's', 't'):
		case FOURCC('s', 'i', 'n', 'f'):
		case FOURCC('s', 'c', 'h', 'i'):
		case FOURCC('e', 'd', 't', 's'):
		{
		if (chunk_type == FOURCC('s', 't', 'b', 'l')) {
		ALOGV("sampleTable chunk is %d bytes long.", (size_t)chunk_size);
		@@ -904,6 +905,66 @@ status_t MPEG4Extractor::parseChunk(off64_t *offset, int depth) {
		break;
		}

		case FOURCC('e', 'l', 's', 't'):
		{
		// See 14496-12 8.6.6
		uint8_t version;
		if (mDataSource->readAt(data_offset, &version, 1) < 1) {
		return ERROR_IO;
		}

		uint32_t entry_count;
		if (!mDataSource->getUInt32(data_offset + 4, &entry_count)) {
		return ERROR_IO;
		}

		if (entry_count != 1) {
		// we only support a single entry at the moment, for gapless playback
		ALOGW("ignoring edit list with %d entries", entry_count);
		} else {
		off64_t entriesoffset = data_offset + 8;
		uint64_t segment_duration;
		int64_t media_time;

		if (version == 1) {
		if (!mDataSource->getUInt64(entriesoffset, &segment_duration) \|\|
		!mDataSource->getUInt64(entriesoffset + 8, (uint64_t*)&media_time)) {
		return ERROR_IO;
		}
		} else if (version == 0) {
		uint32_t sd;
		int32_t mt;
		if (!mDataSource->getUInt32(entriesoffset, &sd) \|\|
		!mDataSource->getUInt32(entriesoffset + 4, (uint32_t*)&mt)) {
		return ERROR_IO;
		}
		segment_duration = sd;
		media_time = mt;
		} else {
		return ERROR_IO;
		}

		uint64_t halfscale = mLastTrack->timescale / 2;
		segment_duration = (segment_duration * 1000000 + halfscale)/ mLastTrack->timescale;
		media_time = (media_time * 1000000 + halfscale) / mLastTrack->timescale;

		int64_t duration;
		int32_t samplerate;
		if (mLastTrack->meta->findInt64(kKeyDuration, &duration) &&
		mLastTrack->meta->findInt32(kKeySampleRate, &samplerate)) {

		int64_t delay = (media_time * samplerate + 500000) / 1000000;
		mLastTrack->meta->setInt32(kKeyEncoderDelay, delay);

		int64_t paddingus = duration - (segment_duration + media_time);
		int64_t paddingsamples = (paddingus * samplerate + 500000) / 1000000;
		mLastTrack->meta->setInt32(kKeyEncoderPadding, paddingsamples);
		}
		}
		*offset += chunk_size;
		break;
		}

		case FOURCC('f', 'r', 'm', 'a'):
		{
		uint32_t original_fourcc;