void CTsDuration::OnTsPacket(byte* tsPacket, int bufferOffset, int bufferLength)
{
CTsHeader header(tsPacket);
CAdaptionField field;
field.Decode(header,tsPacket);
if (field.Pcr.IsValid)
{
if (m_bSearchStart)
{
if ( (m_videoPid>0 && header.Pid==m_videoPid) || m_videoPid<0)
{
m_pid=header.Pid;
m_startPcr=field.Pcr;
m_bSearchStart=false;
if (!m_firstStartPcr.IsValid)
{
m_firstStartPcr=m_startPcr;
}
}
}
if (m_bSearchEnd && m_pid==header.Pid)
{
m_endPcr=field.Pcr;
}
}
}
//*********************************************************
// Callback method. This method gets called via
// CTsFileSeek::Seek()->OnRawData2(buffer,dwBytesRead)
// tsPacket : pointer to 188 byte Transport Stream packet
//
// This method checks if the ts packet contains a PCR timestamp
// and ifso sets the PCR timestamp in m_pcrFound;
void CTsFileSeek::OnTsPacket(byte* tsPacket)
{
if (m_pcrFound.IsValid) return ;
CTsHeader header(tsPacket);
CAdaptionField field;
field.Decode(header,tsPacket);
if (field.Pcr.IsValid)
{
//got a pcr, is it the correct pid?
if ( (m_seekPid>0 && (header.Pid==m_seekPid)) || (m_seekPid<0) )
{
// pid is valid
// did we have a pcr rollover ??
if (m_duration.FirstStartPcr() > m_duration.EndPcr())
{
//pcr rollover occured.
//next we need to convert the pcr into filestamp
//since we are seeking from 0-duration
//but the file can start with any pcr timestamp
if (field.Pcr.ToClock() <=m_duration.EndPcr().ToClock())
{
// pcr < endpcr (second half of the file)
// pcrFound= pcr+(MAXIMUM_PCR - startpcr)
// StartPcr------>(0x1ffffffff;0x1ff), (0x0,0x0)--------->EndPcr
m_pcrFound=field.Pcr;
double d1=m_pcrFound.ToClock();
CPcr pcr2;
pcr2.PcrReferenceBase = 0x1ffffffffULL;
pcr2.PcrReferenceExtension = 0x1ffULL;
double start=pcr2.ToClock()- m_duration.StartPcr().ToClock();
d1+=start;
m_pcrFound.FromClock(d1);
}
else
{
//PCR > endpcr (first half of the file)
// pcrFound= (pcr-startpcr)
m_pcrFound=field.Pcr;
double d1=m_pcrFound.ToClock();
double start=m_duration.StartPcr().ToClock();//earliest pcr available in the file
LogDebug(" found clock %f earliest is %f", d1, start);
d1-=start;
LogDebug(" after sub %f", d1);
m_pcrFound.FromClock(d1);
}
}
else
{
//no pcr rollover occured.
//next we need to convert the pcr into filestamp
//since we are seeking from 0-duration
//but the file can start with any pcr timestamp
// formula: pcrfound = pcr-startpcr;
m_pcrFound=field.Pcr;
double d1=m_pcrFound.ToClock();
double start=m_duration.StartPcr().ToClock(); //earliest pcr available in the file
d1-=start;
m_pcrFound.FromClock(d1);
}
}
}
}
