[MSE] 1362440 Fix WebM segments with Tags elements not properly handled.
parent
75e5edbef3
commit
6d0a42e587
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@ -127,58 +127,37 @@ public:
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MediaResult IsInitSegmentPresent(MediaByteBuffer* aData) override
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{
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ContainerParser::IsInitSegmentPresent(aData);
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// XXX: This is overly primitive, needs to collect data as it's appended
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// to the SB and handle, rather than assuming everything is present in a
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// single aData segment.
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// 0x1a45dfa3 // EBML
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// ...
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// DocType == "webm"
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// ...
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// 0x18538067 // Segment (must be "unknown" size or contain a value large
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// enough to include the Segment Information and Tracks
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// elements that follow)
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// 0x1549a966 // -> Segment Info
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// 0x1654ae6b // -> One or more Tracks
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// 0x1a45dfa3 // EBML
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if (aData->Length() < 4) {
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return NS_ERROR_NOT_AVAILABLE;
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}
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if ((*aData)[0] == 0x1a && (*aData)[1] == 0x45 && (*aData)[2] == 0xdf &&
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(*aData)[3] == 0xa3) {
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return NS_OK;
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WebMBufferedParser parser(0);
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nsTArray<WebMTimeDataOffset> mapping;
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ReentrantMonitor dummy("dummy");
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bool result = parser.Append(aData->Elements(), aData->Length(), mapping,
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dummy);
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if (!result) {
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return MediaResult(NS_ERROR_FAILURE, RESULT_DETAIL("Invalid webm content"));
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}
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return MediaResult(NS_ERROR_FAILURE, RESULT_DETAIL("Invalid webm content"));
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return parser.mInitEndOffset > 0 ? NS_OK : NS_ERROR_NOT_AVAILABLE;
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}
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MediaResult IsMediaSegmentPresent(MediaByteBuffer* aData) override
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{
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ContainerParser::IsMediaSegmentPresent(aData);
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// XXX: This is overly primitive, needs to collect data as it's appended
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// to the SB and handle, rather than assuming everything is present in a
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// single aData segment.
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// 0x1a45dfa3 // EBML
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// ...
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// DocType == "webm"
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// ...
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// 0x18538067 // Segment (must be "unknown" size)
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// 0x1549a966 // -> Segment Info
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// 0x1654ae6b // -> One or more Tracks
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// 0x1f43b675 // Cluster
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if (aData->Length() < 4) {
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return NS_ERROR_NOT_AVAILABLE;
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}
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if ((*aData)[0] == 0x1f && (*aData)[1] == 0x43 && (*aData)[2] == 0xb6 &&
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(*aData)[3] == 0x75) {
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return NS_OK;
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WebMBufferedParser parser(0);
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nsTArray<WebMTimeDataOffset> mapping;
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ReentrantMonitor dummy("dummy");
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parser.AppendMediaSegmentOnly();
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bool result = parser.Append(aData->Elements(), aData->Length(), mapping,
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dummy);
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if (!result) {
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return MediaResult(NS_ERROR_FAILURE, RESULT_DETAIL("Invalid webm content"));
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}
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// 0x1c53bb6b // Cues
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if ((*aData)[0] == 0x1c && (*aData)[1] == 0x53 && (*aData)[2] == 0xbb &&
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(*aData)[3] == 0x6b) {
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return NS_OK;
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}
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return MediaResult(NS_ERROR_FAILURE, RESULT_DETAIL("Invalid webm content"));
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return parser.GetClusterOffset() >= 0 ? NS_OK : NS_ERROR_NOT_AVAILABLE;
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}
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MediaResult ParseStartAndEndTimestamps(MediaByteBuffer* aData,
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@ -113,6 +113,7 @@ bool WebMBufferedParser::Append(const unsigned char* aBuffer, uint32_t aLength,
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} else {
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mClusterEndOffset = -1;
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}
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mGotClusterTimecode = false;
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mState = READ_ELEMENT_ID;
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break;
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case BLOCKGROUP_ID:
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@ -121,6 +122,11 @@ bool WebMBufferedParser::Append(const unsigned char* aBuffer, uint32_t aLength,
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case SIMPLEBLOCK_ID:
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/* FALLTHROUGH */
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case BLOCK_ID:
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if (!mGotClusterTimecode) {
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WEBM_DEBUG("The Timecode element must appear before any Block or "
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"SimpleBlock elements in a Cluster");
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return false;
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}
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mBlockSize = mElement.mSize.mValue;
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mBlockTimecode = 0;
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mBlockTimecodeLength = BLOCK_TIMECODE_LENGTH;
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@ -164,6 +170,7 @@ bool WebMBufferedParser::Append(const unsigned char* aBuffer, uint32_t aLength,
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break;
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case READ_TIMECODESCALE:
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if (!mGotTimecodeScale) {
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WEBM_DEBUG("Should get the SegmentInfo first");
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return false;
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}
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mTimecodeScale = mVInt.mValue;
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@ -171,6 +178,7 @@ bool WebMBufferedParser::Append(const unsigned char* aBuffer, uint32_t aLength,
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break;
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case READ_CLUSTER_TIMECODE:
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mClusterTimecode = mVInt.mValue;
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mGotClusterTimecode = true;
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mState = READ_ELEMENT_ID;
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break;
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case READ_BLOCK_TIMECODE:
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@ -190,6 +198,7 @@ bool WebMBufferedParser::Append(const unsigned char* aBuffer, uint32_t aLength,
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// Don't insert invalid negative timecodes.
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if (mBlockTimecode >= 0 || mClusterTimecode >= uint16_t(abs(mBlockTimecode))) {
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if (!mGotTimecodeScale) {
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WEBM_DEBUG("Should get the TimecodeScale first");
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return false;
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}
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uint64_t absTimecode = mClusterTimecode + mBlockTimecode;
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@ -266,6 +275,12 @@ WebMBufferedParser::EndSegmentOffset(int64_t aOffset)
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return mBlockEndOffset;
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}
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int64_t
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WebMBufferedParser::GetClusterOffset() const
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{
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return mClusterOffset;
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}
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// SyncOffsetComparator and TimeComparator are slightly confusing, in that
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// the nsTArray they're used with (mTimeMapping) is sorted by mEndOffset and
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// these comparators are used on the other fields of WebMTimeDataOffset.
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@ -67,7 +67,7 @@ struct WebMBufferedParser
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, mVIntLeft(0)
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, mBlockSize(0)
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, mClusterTimecode(0)
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, mClusterOffset(0)
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, mClusterOffset(-1)
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, mClusterEndOffset(-1)
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, mBlockOffset(0)
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, mBlockTimecode(0)
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@ -75,6 +75,7 @@ struct WebMBufferedParser
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, mSkipBytes(0)
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, mTimecodeScale(1000000)
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, mGotTimecodeScale(false)
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, mGotClusterTimecode(false)
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{
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if (mStartOffset != 0) {
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mState = FIND_CLUSTER_SYNC;
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@ -86,6 +87,12 @@ struct WebMBufferedParser
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return mTimecodeScale;
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}
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// Use this function when we would only feed media segment for the parser.
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void AppendMediaSegmentOnly()
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{
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mGotTimecodeScale = true;
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}
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// If this parser is not expected to parse a segment info, it must be told
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// the appropriate timecode scale to use from elsewhere.
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void SetTimecodeScale(uint32_t aTimecodeScale) {
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@ -114,6 +121,9 @@ struct WebMBufferedParser
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// This allows to determine the end of the interval containg aOffset.
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int64_t EndSegmentOffset(int64_t aOffset);
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// Return the Cluster offset, return -1 if we can't find the Cluster.
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int64_t GetClusterOffset() const;
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// The offset at which this parser started parsing. Used to merge
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// adjacent parsers, in which case the later parser adopts the earlier
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// parser's mStartOffset.
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@ -231,7 +241,7 @@ private:
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// Start offset of the cluster currently being parsed. Used as the sync
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// point offset for the offset-to-time mapping as each block timecode is
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// been parsed.
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// been parsed. -1 if unknown.
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int64_t mClusterOffset;
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// End offset of the cluster currently being parsed. -1 if unknown.
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@ -260,6 +270,9 @@ private:
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// True if we read the timecode scale from the segment info or have
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// confirmed that the default value is to be used.
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bool mGotTimecodeScale;
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// True if we've read the cluster time code.
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bool mGotClusterTimecode;
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};
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class WebMBufferedState final
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