qosMeasurementRecord(struct timeval const& startTime, RTPSource* src) : fSource(src), fNext(NULL), kbits_per_second_min(1e20), kbits_per_second_max(0), kBytesTotal(0.0), packet_loss_fraction_min(1.0), packet_loss_fraction_max(0.0), totNumPacketsReceived(0), totNumPacketsExpected(0) { measurementEndTime = measurementStartTime = startTime; #ifdef SUPPORT_REAL_RTSP if (session->isRealNetworksRDT) { // hack for RealMedia sessions (RDT, not RTP) RealRDTSource* rdt = (RealRDTSource*)src; kBytesTotal = rdt->totNumKBytesReceived(); totNumPacketsReceived = rdt->totNumPacketsReceived(); totNumPacketsExpected = totNumPacketsReceived; // because we use TCP return; } #endif RTPReceptionStatsDB::Iterator statsIter(src->receptionStatsDB()); // Assume that there's only one SSRC source (usually the case): RTPReceptionStats* stats = statsIter.next(True); if (stats != NULL) { kBytesTotal = stats->totNumKBytesReceived(); totNumPacketsReceived = stats->totNumPacketsReceived(); totNumPacketsExpected = stats->totNumPacketsExpected(); } }
void qosMeasurementRecord ::periodicQOSMeasurement(struct timeval const& timeNow) { unsigned secsDiff = timeNow.tv_sec - measurementEndTime.tv_sec; int usecsDiff = timeNow.tv_usec - measurementEndTime.tv_usec; double timeDiff = secsDiff + usecsDiff/1000000.0; measurementEndTime = timeNow; #ifdef SUPPORT_REAL_RTSP if (session->isRealNetworksRDT) { // hack for RealMedia sessions (RDT, not RTP) RealRDTSource* rdt = (RealRDTSource*)fSource; double kBytesTotalNow = rdt->totNumKBytesReceived(); double kBytesDeltaNow = kBytesTotalNow - kBytesTotal; kBytesTotal = kBytesTotalNow; double kbpsNow = timeDiff == 0.0 ? 0.0 : 8*kBytesDeltaNow/timeDiff; if (kbpsNow < 0.0) kbpsNow = 0.0; // in case of roundoff error if (kbpsNow < kbits_per_second_min) kbits_per_second_min = kbpsNow; if (kbpsNow > kbits_per_second_max) kbits_per_second_max = kbpsNow; totNumPacketsReceived = rdt->totNumPacketsReceived(); totNumPacketsExpected = totNumPacketsReceived; // because we use TCP packet_loss_fraction_min = packet_loss_fraction_max = 0.0; // ditto return; } #endif RTPReceptionStatsDB::Iterator statsIter(fSource->receptionStatsDB()); // Assume that there's only one SSRC source (usually the case): RTPReceptionStats* stats = statsIter.next(True); if (stats != NULL) { double kBytesTotalNow = stats->totNumKBytesReceived(); double kBytesDeltaNow = kBytesTotalNow - kBytesTotal; kBytesTotal = kBytesTotalNow; double kbpsNow = timeDiff == 0.0 ? 0.0 : 8*kBytesDeltaNow/timeDiff; if (kbpsNow < 0.0) kbpsNow = 0.0; // in case of roundoff error if (kbpsNow < kbits_per_second_min) kbits_per_second_min = kbpsNow; if (kbpsNow > kbits_per_second_max) kbits_per_second_max = kbpsNow; unsigned totReceivedNow = stats->totNumPacketsReceived(); unsigned totExpectedNow = stats->totNumPacketsExpected(); unsigned deltaReceivedNow = totReceivedNow - totNumPacketsReceived; unsigned deltaExpectedNow = totExpectedNow - totNumPacketsExpected; totNumPacketsReceived = totReceivedNow; totNumPacketsExpected = totExpectedNow; double lossFractionNow = deltaExpectedNow == 0 ? 0.0 : 1.0 - deltaReceivedNow/(double)deltaExpectedNow; //if (lossFractionNow < 0.0) lossFractionNow = 0.0; //reordering can cause if (lossFractionNow < packet_loss_fraction_min) { packet_loss_fraction_min = lossFractionNow; } if (lossFractionNow > packet_loss_fraction_max) { packet_loss_fraction_max = lossFractionNow; } } }