Hack to "support" "enhanced" podcasts... slang for malformed .mp4 files. (4d60fc5b) · Commits · e / os / android_frameworks_base

media/libstagefright/MPEG4Extractor.cpp

+49 −7

Original line number	Diff line number	Diff line
		@@ -501,7 +501,10 @@ status_t MPEG4Extractor::parseChunk(off_t *offset, int depth) {
		}
		}

		bool isTrack = false;
		if (chunk_type == FOURCC('t', 'r', 'a', 'k')) {
		isTrack = true;

		Track *track = new Track;
		track->next = NULL;
		if (mLastTrack) {
		@@ -513,6 +516,7 @@ status_t MPEG4Extractor::parseChunk(off_t *offset, int depth) {

		track->meta = new MetaData;
		track->includes_expensive_metadata = false;
		track->skipTrack = false;
		track->timescale = 0;
		track->sampleTable = new SampleTable(mDataSource);
		track->meta->setCString(kKeyMIMEType, "application/octet-stream");
		@@ -531,7 +535,25 @@ status_t MPEG4Extractor::parseChunk(off_t *offset, int depth) {
		return ERROR_MALFORMED;
		}

		if (chunk_type == FOURCC('t', 'r', 'a', 'k')) {
		if (isTrack) {
		if (mLastTrack->skipTrack) {
		Track *cur = mFirstTrack;

		if (cur == mLastTrack) {
		delete cur;
		mFirstTrack = mLastTrack = NULL;
		} else {
		while (cur && cur->next != mLastTrack) {
		cur = cur->next;
		}
		cur->next = NULL;
		delete mLastTrack;
		mLastTrack = cur;
		}

		return OK;
		}

		status_t err = verifyTrack(mLastTrack);

		if (err != OK) {
		@@ -657,12 +679,14 @@ status_t MPEG4Extractor::parseChunk(off_t *offset, int depth) {

		case FOURCC('h', 'd', 'l', 'r'):
		{
		if (chunk_data_size < 25) {
		uint8_t buffer[12];

		if (chunk_data_size < (ssize_t)sizeof(buffer)) {
		return ERROR_MALFORMED;
		}

		uint8_t buffer[24];
		if (mDataSource->readAt(data_offset, buffer, 24) < 24) {
		if (mDataSource->readAt(data_offset, buffer, sizeof(buffer))
		< (ssize_t)sizeof(buffer)) {
		return ERROR_IO;
		}

		@@ -672,7 +696,17 @@ status_t MPEG4Extractor::parseChunk(off_t *offset, int depth) {
		}

		if (U32_AT(&buffer[4]) != 0) {
		// pre_defined should be 0.
		// pre_defined should be 0 for an ISO 14496-12 compliant
		// file, if it's not try some heuristics seen in the field.
		// This has been added to support some so-called
		// "enhanced" podcasts.

		if (U32_AT(&buffer[4]) == FOURCC('d', 'h', 'l', 'r')) {
		*offset += chunk_size;
		break;
		}

		if (U32_AT(&buffer[4]) != FOURCC('m', 'h', 'l', 'r')) {
		return ERROR_MALFORMED;
		}

		@@ -681,6 +715,11 @@ status_t MPEG4Extractor::parseChunk(off_t *offset, int depth) {
		break;
		}

		mHandlerType = U32_AT(&buffer[8]);
		*offset += chunk_size;
		break;
		}

		case FOURCC('s', 't', 's', 'd'):
		{
		if (chunk_data_size < 8) {
		@@ -706,7 +745,10 @@ status_t MPEG4Extractor::parseChunk(off_t *offset, int depth) {

		if (entry_count > 1) {
		// For now we only support a single type of media per track.
		return ERROR_UNSUPPORTED;

		mLastTrack->skipTrack = true;
		*offset += chunk_size;
		break;
		}

		off_t stop_offset = *offset + chunk_size;

media/libstagefright/include/MPEG4Extractor.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -48,6 +48,7 @@ private:
		uint32_t timescale;
		sp<SampleTable> sampleTable;
		bool includes_expensive_metadata;
		bool skipTrack;
		};

		sp<DataSource> mDataSource;