void JPEGVideoRTPSink
::doSpecialFrameHandling(unsigned fragmentationOffset,
unsigned char* /*frameStart*/,
unsigned /*numBytesInFrame*/,
struct timeval frameTimestamp,
unsigned numRemainingBytes) {
// Our source is known to be a JPEGVideoSource
JPEGVideoSource* source = (JPEGVideoSource*)fSource;
if (source == NULL) return; // sanity check
u_int8_t mainJPEGHeader[8]; // the special header
mainJPEGHeader[0] = 0; // Type-specific
mainJPEGHeader[1] = fragmentationOffset >> 16;
mainJPEGHeader[2] = fragmentationOffset >> 8;
mainJPEGHeader[3] = fragmentationOffset;
mainJPEGHeader[4] = source->type();
mainJPEGHeader[5] = source->qFactor();
mainJPEGHeader[6] = source->width();
mainJPEGHeader[7] = source->height();
setSpecialHeaderBytes(mainJPEGHeader, sizeof mainJPEGHeader);
if (fragmentationOffset == 0 && source->qFactor() >= 128) {
// There is also a Quantization Header:
u_int8_t precision;
u_int16_t length;
u_int8_t const* quantizationTables
= source->quantizationTables(precision, length);
unsigned const quantizationHeaderSize = 4 + length;
u_int8_t* quantizationHeader = new u_int8_t[quantizationHeaderSize];
quantizationHeader[0] = 0; // MBZ
quantizationHeader[1] = precision;
quantizationHeader[2] = length >> 8;
quantizationHeader[3] = length&0xFF;
if (quantizationTables != NULL) { // sanity check
for (u_int16_t i = 0; i < length; ++i) {
quantizationHeader[4+i] = quantizationTables[i];
}
}
setSpecialHeaderBytes(quantizationHeader, quantizationHeaderSize,
sizeof mainJPEGHeader /* start position */);
delete[] quantizationHeader;
}
void JPEGVideoRTPSink
::doSpecialFrameHandling(unsigned fragmentationOffset,
unsigned char* /*frameStart*/,
unsigned /*numBytesInFrame*/,
struct timeval framePresentationTime,
unsigned numRemainingBytes) {
// Our source is known to be a JPEGVideoSource
JPEGVideoSource* source = (JPEGVideoSource*)fSource;
if (source == NULL) return; // sanity check
u_int8_t mainJPEGHeader[8]; // the special header
u_int8_t const type = source->type();
mainJPEGHeader[0] = 0; // Type-specific
mainJPEGHeader[1] = fragmentationOffset >> 16;
mainJPEGHeader[2] = fragmentationOffset >> 8;
mainJPEGHeader[3] = fragmentationOffset;
mainJPEGHeader[4] = type;
mainJPEGHeader[5] = source->qFactor();
mainJPEGHeader[6] = source->width();
mainJPEGHeader[7] = source->height();
setSpecialHeaderBytes(mainJPEGHeader, sizeof mainJPEGHeader);
unsigned restartMarkerHeaderSize = 0; // by default
if (type >= 64 && type <= 127) {
// There is also a Restart Marker Header:
restartMarkerHeaderSize = 4;
u_int16_t const restartInterval = source->restartInterval(); // should be non-zero
u_int8_t restartMarkerHeader[4];
restartMarkerHeader[0] = restartInterval>>8;
restartMarkerHeader[1] = restartInterval&0xFF;
restartMarkerHeader[2] = restartMarkerHeader[3] = 0xFF; // F=L=1; Restart Count = 0x3FFF
setSpecialHeaderBytes(restartMarkerHeader, restartMarkerHeaderSize,
sizeof mainJPEGHeader/* start position */);
}