void
MembershipBookkeeping::SyncSourceLink::computeStats()
{
// See Appendix A.3
// compute cumulative packet lost.
setExtendedMaxSeqNum(getMaxSeqNum() + getSeqNumAccum());
uint32 expected =
(getExtendedMaxSeqNum() - getBaseSeqNum() + 1);
uint32 pc = getObservedPacketCount();
uint32 lost;
if ( 0 == pc )
lost = 0;
else
lost = expected - pc;
setCumulativePacketLost(lost);
// compute the fraction of packets lost during the last
// reporting interval.
uint32 expectedDelta = expected - expectedPrior;
expectedPrior = expected;
uint32 receivedDelta = getObservedPacketCount() -
receivedPrior;
receivedPrior = getObservedPacketCount();
uint32 lostDelta = expectedDelta - receivedDelta;
if ( expectedDelta == 0 || lostDelta <= 0 )
setFractionLost(0);
else
setFractionLost((lostDelta<<8) / expectedDelta );
}
void Stats::processRtcpPacket(RtcpHeader* chead) {
unsigned int ssrc = chead->getSSRC();
ELOG_DEBUG("RTCP SubPacket: PT %d, SSRC %u, block count %d ",
chead->packettype, chead->getSSRC(), chead->getBlockCount());
switch (chead->packettype) {
case RTCP_SDES_PT:
ELOG_DEBUG("SDES");
break;
case RTCP_BYE:
ELOG_DEBUG("RTCP BYE");
break;
case RTCP_Receiver_PT:
setFractionLost(chead->getFractionLost(), ssrc);
setPacketsLost(chead->getLostPackets(), ssrc);
setJitter(chead->getJitter(), ssrc);
setSourceSSRC(chead->getSourceSSRC(), ssrc);
break;
case RTCP_Sender_PT:
setRtcpPacketSent(chead->getPacketsSent(), ssrc);
setRtcpBytesSent(chead->getOctetsSent(), ssrc);
break;
case RTCP_RTP_Feedback_PT:
ELOG_DEBUG("RTP FB: Usually NACKs: %u", chead->getBlockCount());
ELOG_DEBUG("PID %u BLP %u", chead->getNackPid(), chead->getNackBlp());
accountNACKMessage(ssrc);
break;
case RTCP_PS_Feedback_PT:
ELOG_DEBUG("RTCP PS FB TYPE: %u", chead->getBlockCount() );
switch (chead->getBlockCount()) {
case RTCP_PLI_FMT:
ELOG_DEBUG("PLI Message");
accountPLIMessage(ssrc);
break;
case RTCP_SLI_FMT:
ELOG_DEBUG("SLI Message");
accountSLIMessage(ssrc);
break;
case RTCP_FIR_FMT:
ELOG_DEBUG("FIR Message");
accountFIRMessage(ssrc);
break;
case RTCP_AFB:
{
char *uniqueId = reinterpret_cast<char*>(&chead->report.rembPacket.uniqueid);
if (!strncmp(uniqueId, "REMB", 4)) {
uint64_t bitrate = chead->getBrMantis() << chead->getBrExp();
// ELOG_DEBUG("REMB Packet numSSRC %u mantissa %u exp %u, tot %lu bps",
// chead->getREMBNumSSRC(), chead->getBrMantis(), chead->getBrExp(), bitrate);
setBandwidth(bitrate, ssrc);
} else {
ELOG_DEBUG("Unsupported AFB Packet not REMB")
}
break;
}
default:
ELOG_WARN("Unsupported RTCP_PS FB TYPE %u", chead->getBlockCount());
break;
}
break;
default:
ELOG_DEBUG("Unknown RTCP Packet, %d", chead->packettype);
break;
}
}
