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fix mks file parsing

This commit is contained in:
odrling 2020-12-22 02:15:31 +01:00
parent 9db826f86e
commit 818405ed91
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GPG Key ID: EC907F69A27A90C5
1 changed files with 30 additions and 17 deletions
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47
src/MatroskaParser.c
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@ -1086,28 +1086,42 @@ static void parseSegmentInfo(MatroskaFile *mf,uint64_t toplen) {
mf->Seg.Duration = mul3(duration,mf->Seg.TimecodeScale);
}
static int getVideoTrackIndex(MatroskaFile *mf) {
int i;
for (i = 0; i < mf->nTracks; ++i) {
if (mf->Tracks[i]->Type == TT_VIDEO) {
return i;
}
}
return -1;
}
static void parseFirstCluster(MatroskaFile *mf,uint64_t toplen) {
uint64_t end = filepos(mf) + toplen;
uint64_t clusterTimecode;
int tracknum = -1;
int i = 0;
int videoTrack = getVideoTrackIndex(mf);
// only read the first cluster when there is no video track
if (videoTrack == -1)
mf->seen.Cluster = 1;
mf->firstTimecode = 0;
FOREACH(mf,toplen)
case 0xe7: // Timecode
mf->firstTimecode += readUInt(mf,(unsigned)len);
clusterTimecode = readUInt(mf,(unsigned)len);
break;
case 0xa3: // BlockEx
start = filepos(mf);
tracknum = readVLUInt(mf); // track number
for (i = 0; i < mf->nTracks; ++i) {
if (mf->Tracks[i]->Number == tracknum && mf->Tracks[i]->Type == TT_VIDEO) {
mf->firstTimecode += readSInt(mf, 2);
mf->seen.Cluster = 1;
skipbytes(mf,end - filepos(mf));
return;
}
if (videoTrack != -1 &&
mf->Tracks[videoTrack]->Number == tracknum && mf->Tracks[videoTrack]->Type == TT_VIDEO) {
mf->firstTimecode = clusterTimecode + readSInt(mf, 2);
skipbytes(mf,end - filepos(mf));
mf->seen.Cluster = 1;
return;
}
skipbytes(mf, len - (filepos(mf) - start));
@ -1118,14 +1132,13 @@ static void parseFirstCluster(MatroskaFile *mf,uint64_t toplen) {
start = filepos(mf);
tracknum = readVLUInt(mf); // track number
for (i = 0; i < mf->nTracks; ++i) {
if (mf->Tracks[i]->Number == tracknum && mf->Tracks[i]->Type == TT_VIDEO) {
mf->firstTimecode += readSInt(mf, 2);
mf->seen.Cluster = 1;
skipbytes(mf,end - filepos(mf));
return;
}
}
if (videoTrack != -1 &&
mf->Tracks[videoTrack]->Number == tracknum && mf->Tracks[videoTrack]->Type == TT_VIDEO) {
mf->firstTimecode = clusterTimecode + readSInt(mf, 2);
skipbytes(mf,end - filepos(mf));
mf->seen.Cluster = 1;
return;
}
skipbytes(mf, len - (filepos(mf) - start));
break;