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improve JPEG quantization table

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This commit is contained in:
mpromonet 2016-05-18 20:29:03 +00:00
parent 2243e62fc6
commit 570ff43e78
1 changed files with 12 additions and 12 deletions
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24
inc/MJPEGVideoSource.h
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@ -40,7 +40,7 @@ class MJPEGVideoSource : public JPEGVideoSource
int headerSize = 0;
bool headerOk = false;
fFrameSize = 0;
for (unsigned int i = 0; i < frameSize ; ++i)
{
// SOF
@ -53,13 +53,13 @@ class MJPEGVideoSource : public JPEGVideoSource
// DQT
if ( (i+5+64) < frameSize && (fTo[i] == 0xFF) && (fTo[i+1] == 0xDB))
{
int quantSize = fTo[i+3];
int quantIdx = fTo[i+4];
if (quantIdx < 3)
unsigned int quantSize = fTo[i+3]-4;
unsigned int quantIdx = fTo[i+4];
if (quantSize*quantIdx+quantSize <= sizeof(m_qTable))
{
if ( quantIdx+1 > m_qTableCount )
m_qTableCount = quantIdx+1;
memcpy(m_qTable + quantIdx*64, fTo + i + 5, 64);
memcpy(m_qTable + quantSize*quantIdx, fTo + i + 5, quantSize);
if (quantSize*quantIdx+quantSize > m_qTableSize)
m_qTableSize = quantSize*quantIdx+quantSize;
}
}
// End of header
@ -90,9 +90,9 @@ class MJPEGVideoSource : public JPEGVideoSource
{
length = 0;
precision = 0;
if (m_qTableCount > 0)
if (m_qTableSize > 0)
{
length = 64*m_qTableCount;
length = m_qTableSize;
}
return m_qTable;
}
@ -100,7 +100,7 @@ class MJPEGVideoSource : public JPEGVideoSource
protected:
MJPEGVideoSource(UsageEnvironment& env, FramedSource* source) : JPEGVideoSource(env),
m_inputSource(source),
m_width(0), m_height(0), m_qTableCount(0),
m_width(0), m_height(0), m_qTableSize(0),
m_type(0)
{
memset(&m_qTable,0,sizeof(m_qTable));
@ -114,7 +114,7 @@ class MJPEGVideoSource : public JPEGVideoSource
FramedSource* m_inputSource;
u_int8_t m_width;
u_int8_t m_height;
u_int8_t m_qTable[64*3];
int m_qTableCount;
u_int8_t m_qTable[128*2];
unsigned int m_qTableSize;
u_int8_t m_type;
};