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Issue #1536 - Part 2: Parse content to decide whether it's a media segment.

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wolfbeast 2020-05-07 13:40:21 +02:00 • committed by Roy Tam
commit c604c8363d
3 changed files with 27 additions and 23 deletions
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31
dom/media/mediasource/ContainerParser.cpp
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@ -154,31 +154,20 @@ public:
MediaResult IsMediaSegmentPresent(MediaByteBuffer* aData) override
{
ContainerParser::IsMediaSegmentPresent(aData);
// XXX: This is overly primitive, needs to collect data as it's appended
// to the SB and handle, rather than assuming everything is present in a
// single aData segment.
// 0x1a45dfa3 // EBML
// ...
// DocType == "webm"
// ...
// 0x18538067 // Segment (must be "unknown" size)
// 0x1549a966 // -> Segment Info
// 0x1654ae6b // -> One or more Tracks
// 0x1f43b675 // Cluster
if (aData->Length() < 4) {
return NS_ERROR_NOT_AVAILABLE;
}
if ((*aData)[0] == 0x1f && (*aData)[1] == 0x43 && (*aData)[2] == 0xb6 &&
(*aData)[3] == 0x75) {
return NS_OK;
WebMBufferedParser parser(0);
nsTArray<WebMTimeDataOffset> mapping;
ReentrantMonitor dummy("dummy");
parser.AppendMediaSegmentOnly();
bool result = parser.Append(aData->Elements(), aData->Length(), mapping,
dummy);
if (!result) {
return MediaResult(NS_ERROR_FAILURE, RESULT_DETAIL("Invalid webm content"));
}
// 0x1c53bb6b // Cues
if ((*aData)[0] == 0x1c && (*aData)[1] == 0x53 && (*aData)[2] == 0xbb &&
(*aData)[3] == 0x6b) {
return NS_OK;
}
return MediaResult(NS_ERROR_FAILURE, RESULT_DETAIL("Invalid webm content"));
return parser.GetClusterOffset() >= 0 ? NS_OK : NS_ERROR_NOT_AVAILABLE;
}
MediaResult ParseStartAndEndTimestamps(MediaByteBuffer* aData,