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;
}
}
}
