void M2VParser::StampFrame(MPEGFrame* frame){
MediaTime timeunit;
timeunit = (MediaTime)(1000000000/(m_seqHdr.frameOrFieldRate*2));
if (m_timecodes.empty())
frame->timecode = previousTimecode + previousDuration;
else {
frame->timecode = m_timecodes.front();
m_timecodes.pop_front();
}
previousTimecode = frame->timecode;
frame->duration = (MediaTime)(frame->duration * timeunit);
previousDuration = frame->duration;
if(frame->frameType == 'P'){
frame->firstRef = firstRef;
ShoveRef(previousTimecode);
}else if(frame->frameType == 'B'){
frame->firstRef = firstRef;
frame->secondRef = secondRef;
} else{
ShoveRef(previousTimecode);
}
frame->stamped = true;
}
//Reads frames until it can timestamp them, usually reads until it has
//an I, P, B+, P...this way it can stamp them all and set references.
//NOTE: references aren't yet used by our system but they are kept up
//with in this plugin.
int32_t M2VParser::FillQueues(){
if(chunks.empty()){
return -1;
}
bool done = false;
while(!done){
MediaTime myTime = currentStampingTime;
MPEGChunk* chunk = chunks.front();
while (chunk->GetType() != MPEG_VIDEO_PICTURE_START_CODE) {
if (chunk->GetType() == MPEG_VIDEO_GOP_START_CODE) {
if (gopChunk)
delete gopChunk;
gopChunk = chunk;
} else if (chunk->GetType() == MPEG_VIDEO_SEQUENCE_START_CODE) {
if (seqHdrChunk)
delete seqHdrChunk;
ParseSequenceHeader(chunk, m_seqHdr);
seqHdrChunk = chunk;
}
chunks.erase(chunks.begin());
if (chunks.empty())
return -1;
chunk = chunks.front();
}
MPEG2PictureHeader picHdr;
ParsePictureHeader(chunk, picHdr);
MediaTime bcount;
if(myTime == nextSkip){
myTime+=nextSkipDuration;
currentStampingTime=myTime;
}
switch(picHdr.frameType){
case MPEG2_I_FRAME:
bcount = CountBFrames();
if(bcount > 0){ //..BBIBB..
myTime += bcount;
nextSkip = myTime;
nextSkipDuration = GetFrameDuration(picHdr);
}else{ //IPBB..
if(bcount == -1 && !m_eos)
return -1;
currentStampingTime += GetFrameDuration(picHdr);;
}
ShoveRef(myTime);
QueueFrame(chunk, myTime, picHdr);
notReachedFirstGOP = false;
break;
case MPEG2_P_FRAME:
bcount = CountBFrames();
if(firstRef == -1) break;
if(bcount > 0){ //..PBB..
myTime += bcount;
nextSkip = myTime;
nextSkipDuration = GetFrameDuration(picHdr);
}else{ //..PPBB..
if(bcount == -1 && !m_eos) return -1;
currentStampingTime+=GetFrameDuration(picHdr);
}
ShoveRef(myTime);
QueueFrame(chunk, myTime, picHdr);
break;
default: //B-frames
if(firstRef == -1 || secondRef == -1) break;
QueueFrame(chunk, myTime, picHdr);
currentStampingTime+=GetFrameDuration(picHdr);
}
chunks.erase(chunks.begin());
delete chunk;
if (chunks.empty())
return -1;
}
return 0;
}
