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fix dqt parsing

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Michel Promonet 2019-02-27 23:03:19 +01:00 committed by GitHub
parent a46c6c1346
commit 8281cbbb96
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 3 deletions
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6
src/MJPEGVideoSource.cpp
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@ -45,7 +45,7 @@ void MJPEGVideoSource::afterGettingFrame(unsigned frameSize,unsigned numTruncate
i+=length+2;
}
// DQT
else if ((fTo[i] == 0xFF) && (fTo[i+1] == 0xDB)) {
else if (((i+5) < frameSize) && (fTo[i] == 0xFF) && (fTo[i+1] == 0xDB)) {
int length = (fTo[i+2]<<8)|(fTo[i+3]);
LOG(DEBUG) << "DQT length:" << length;
@ -53,8 +53,8 @@ void MJPEGVideoSource::afterGettingFrame(unsigned frameSize,unsigned numTruncate
unsigned int quantIdx = fTo[i+4]&0x0f;
unsigned int quantSize = 64*(precision+1);
if (quantSize*quantIdx+quantSize <= sizeof(m_qTable)) {
if ( (i+5+length) < frameSize) {
memcpy(m_qTable + quantSize*quantIdx, fTo + i + 5, length);
if ( (i+2+length) < frameSize) {
memcpy(m_qTable + quantSize*quantIdx, fTo + i + 5, length-3);
LOG(DEBUG) << "Quantization table idx:" << quantIdx << " precision:" << precision << " size:" << quantSize << " total size:" << m_qTableSize;
if (quantSize*quantIdx+quantSize > m_qTableSize) {
m_qTableSize = quantSize*quantIdx+quantSize;