uint8_t OpenDMLHeader::computePtsDts(void)
{
// if it is mpeg4-sp, removed packet bitstream & reindex
if(isMpeg4Compatible(_videostream.fccHandler)) OpenDMLHeader::unpackPacked( );
// Now if we have B frames, it is properly tagged
// Begin by putting PTS=DTS i.e. no B-frames
for(int i=0;i<_videostream.dwLength;i++)
{
odmlIndex *idx=&( _idx[i]);
idx->pts=ADM_COMPRESSED_NO_PTS;
idx->dts=frameToUs(i);
}
_idx[0].pts=0;
return 1;
}
/**
\fn getVideoDuration
*/
uint64_t OpenDMLHeader::getVideoDuration(void)
{
if(!_videostream.dwLength) return 0;
return _idx[_videostream.dwLength-1].dts+frameToUs(1);
}
/**
\fn getVideoDuration
\brief Returns duration of video in us
*/
uint64_t MY_CLASS::getVideoDuration(void)
{
int lastFrame=ListOfFrames.size();
if(!lastFrame) return 0;
lastFrame--;
int maxLookup=100;
if(maxLookup>lastFrame) maxLookup=lastFrame;
int start=lastFrame-maxLookup;
uint64_t maxPts=0,maxDts=0;
int maxPtsIndex=-1,maxDtsIndex=-1;
// Search for higher PTS in the last N frames
// and note down its position..
for(int i=start; i<=lastFrame; i++)
{
uint64_t p=ListOfFrames[i]->pts;
if(p==ADM_NO_PTS)
continue;
if(p>maxPts)
{
maxPts=p;
maxPtsIndex=i;
}
}
ADM_info("Found maxPts =%s, %d frames from the end\n",ADM_us2plain(maxPts),lastFrame-maxPtsIndex);
for(int i=lastFrame; i>=start; i--)
{
uint64_t p=ListOfFrames[i]->dts;
if(p==ADM_NO_PTS)
continue;
maxDtsIndex=i;
maxDts=p;
break;
}
ADM_info("Found maxDts =%s, %d frames from the end\n",ADM_us2plain(maxDts),lastFrame-maxDtsIndex);
// Case 1: No Pts
bool usePts=true;
if(maxPtsIndex==-1)
{
usePts=false;
}
uint64_t refTime;
double refDistance;
if(usePts==true)
{
ADM_info("Using PTS..\n");
refTime=maxPts;
refDistance=lastFrame-maxPtsIndex;
} else
{
ADM_info("Using DTS..\n");
refTime=maxDts;
refDistance=lastFrame-maxDtsIndex;
}
double f,g;
f=1000*1000*1000;
f/=_videostream.dwRate;
g=refTime;
f=f*refDistance;
g+=f;
uint64_t duration=(uint64_t)g;
ADM_info("Using duration of %s\n",ADM_us2plain(duration));
return duration+frameToUs(1);
}
