int RtcpForwarder::addREMB(char* buf, int len, uint32_t bitrate){
buf+=len;
RtcpHeader theREMB;
theREMB.setPacketType(RTCP_PS_Feedback_PT);
theREMB.setBlockCount(RTCP_AFB);
memcpy(&theREMB.report.rembPacket.uniqueid, "REMB", 4);
theREMB.setSSRC(rtcpSink_->getVideoSinkSSRC());
theREMB.setSourceSSRC(rtcpSource_->getVideoSourceSSRC());
theREMB.setLength(5);
theREMB.setREMBBitRate(bitrate);
theREMB.setREMBNumSSRC(1);
theREMB.setREMBFeedSSRC(rtcpSource_->getVideoSourceSSRC());
int rembLength = (theREMB.getLength()+1)*4;
memcpy(buf, (uint8_t*)&theREMB, rembLength);
return (len+rembLength);
}
int RtcpForwarder::analyzeFeedback(char *buf, int len) {
RtcpHeader *chead = reinterpret_cast<RtcpHeader*>(buf);
if (chead->isFeedback()) {
uint32_t sourceSsrc = chead->getSourceSSRC();
// We try to add it just in case it is not there yet (otherwise its noop)
this->addSourceSsrc(sourceSsrc);
struct timeval now;
gettimeofday(&now, NULL);
char* movingBuf = buf;
int rtcpLength = 0;
int totalLength = 0;
int currentBlock = 0;
do {
movingBuf+=rtcpLength;
chead = reinterpret_cast<RtcpHeader*>(movingBuf);
rtcpLength = (ntohs(chead->length)+1) * 4;
totalLength += rtcpLength;
switch(chead->packettype){
case RTCP_SDES_PT:
ELOG_DEBUG("SDES");
break;
case RTCP_BYE:
ELOG_DEBUG("BYE");
break;
case RTCP_Receiver_PT:
if (chead->getSourceSSRC() == rtcpSource_->getVideoSourceSSRC()){
ELOG_DEBUG("Analyzing Video RR: PacketLost %u, Ratio %u, currentBlock %d, blocks %d, sourceSSRC %u, ssrc %u changed to %u",
chead->getLostPackets(),
chead->getFractionLost(),
currentBlock,
chead->getBlockCount(),
chead->getSourceSSRC(),
chead->getSSRC(),
rtcpSink_->getVideoSinkSSRC());
chead->setSSRC(rtcpSink_->getVideoSinkSSRC());
}else{
ELOG_DEBUG("Analyzing Audio RR: PacketLost %u, Ratio %u, currentBlock %d, blocks %d, sourceSSRC %u, ssrc %u changed to %u",
chead->getLostPackets(),
chead->getFractionLost(),
currentBlock,
chead->getBlockCount(),
chead->getSourceSSRC(),
chead->getSSRC(),
rtcpSink_->getAudioSinkSSRC());
chead->setSSRC(rtcpSink_->getAudioSinkSSRC());
}
break;
case RTCP_RTP_Feedback_PT:
ELOG_DEBUG("RTP FB: Usually NACKs: %u, currentBlock %d", chead->getBlockCount(), currentBlock);
ELOG_DEBUG("NACK PID %u BLP %u", chead->getNackPid(), chead->getNackBlp());
// We analyze NACK to avoid sending repeated NACKs
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, currentBlock %d", currentBlock);
// 1: PLI, 4: FIR
break;
case RTCP_SLI_FMT:
ELOG_WARN("SLI Message");
break;
case RTCP_FIR_FMT:
ELOG_WARN("FIR Message");
break;
case RTCP_AFB:
{
char *uniqueId = (char*)&chead->report.rembPacket.uniqueid;
if (!strncmp(uniqueId,"REMB", 4)){
uint64_t bitrate = chead->getBrMantis() << chead->getBrExp();
uint64_t cappedBitrate = 0;
cappedBitrate = bitrate < maxVideoBw_? bitrate: maxVideoBw_;
if (bitrate < maxVideoBw_){
cappedBitrate = bitrate;
}else{
cappedBitrate = maxVideoBw_;
}
ELOG_DEBUG("Received REMB %lu, partnum %u, cappedBitrate %lu", bitrate, currentBlock, cappedBitrate);
chead->setREMBBitRate(cappedBitrate);
}
else{
ELOG_WARN("Unsupported AFB Packet not REMB")
}
break;
}
default:
ELOG_WARN("Unsupported RTCP_PS FB TYPE %u",chead->getBlockCount());
break;
}
break;
default:
ELOG_WARN("Unknown RTCP Packet, %d", chead->packettype);
break;
}
currentBlock++;
} while (totalLength < len);
return len;
}
