bool RtpSource::RemoveInternalRtpPacket(RtpPacket *rtpPacket)
{
bool result = false;
if (rtpPacket != NULL)
{
RtpPacket *previousRtpPacket = rtpPacket->GetPreviousPacket();;
RtpPacket *nextRtpPacket = rtpPacket->GetNextPacket();
if (previousRtpPacket != NULL)
{
// next RTP packet can be NULL, in that case previous RTP packet will be last
previousRtpPacket->SetNextPacket(nextRtpPacket);
}
else
{
// first packet will be deleted, first packet need to be moved to next packet
// if next RTP packet is NULL then packet to delete was one and only and this->firstRtpPacket will be set to NULL
this->firstRtpPacket = nextRtpPacket;
}
if (nextRtpPacket != NULL)
{
// previous RTP packet can be NULL, in that case next RTP packet will be first
nextRtpPacket->SetPreviousPacket(previousRtpPacket);
}
delete rtpPacket;
result = true;
}
return result;
}
bool RtpSource::AddPacket(RtpPacket *rtpPacket)
{
bool result = (rtpPacket != NULL);
if (result)
{
result &= rtpPacket->IsRtpPacket();
}
if (result)
{
this->logger->Log(LOGGER_DATA, _T("%s: %s: sequence number: %u"), PROTOCOL_IMPLEMENTATION_NAME, METHOD_ADD_PACKET_NAME, rtpPacket->GetSequenceNumber());
// check where packet need to be inserted
if (this->firstRtpPacket == NULL)
{
this->firstRtpPacket = rtpPacket;
}
else
{
unsigned int rtpPacketSequenceNumber = rtpPacket->GetSequenceNumber();
// in RTP packets chain cannot be wrong packets
RtpPacket *firstPacket = NULL;
RtpPacket *secondPacket = this->firstRtpPacket;
// go to the end of chain
while (secondPacket != NULL)
{
firstPacket = secondPacket;
secondPacket = secondPacket->GetNextPacket();
}
// now go from end of chain to start of chain
while (1)
{
bool between = true;
if ((firstPacket != NULL) && (secondPacket != NULL))
{
between &= this->IsPacketBetween(rtpPacket, firstPacket, secondPacket);
}
else if (firstPacket != NULL)
{
// rtpPacket is after first packet ?
between &= (this->PacketSequenceNumberDifference(firstPacket, rtpPacket) >= 0);
}
else if (secondPacket != NULL)
{
// rtpPacket is before second packet ?
between &= (this->PacketSequenceNumberDifference(rtpPacket, secondPacket) <= 0);
}
if (between)
{
// got combination of two packets
break;
}
secondPacket = firstPacket;
if (firstPacket != NULL)
{
firstPacket = firstPacket->GetPreviousPacket();
}
}
if ((firstPacket == NULL) && (secondPacket != NULL))
{
// packet have to be added before this->firstRtpPacket
this->firstRtpPacket->SetPreviousPacket(rtpPacket);
rtpPacket->SetNextPacket(this->firstRtpPacket);
rtpPacket->SetPreviousPacket(NULL);
this->firstRtpPacket = rtpPacket;
}
else if ((firstPacket != NULL) && (secondPacket != NULL))
{
// packet have to be added between first and second packet
firstPacket->SetNextPacket(rtpPacket);
secondPacket->SetPreviousPacket(rtpPacket);
rtpPacket->SetPreviousPacket(firstPacket);
rtpPacket->SetNextPacket(secondPacket);
}
else if ((firstPacket != NULL) && (secondPacket == NULL))
{
// packet have to be added at the end (after first packet)
firstPacket->SetNextPacket(rtpPacket);
rtpPacket->SetPreviousPacket(firstPacket);
rtpPacket->SetNextPacket(NULL);
}
}
}
return result;
}
