qosMeasurementRecord Class Reference

Collaboration diagram for qosMeasurementRecord:

[legend]

Public Member Functions
	qosMeasurementRecord (struct timeval const &startTime, RTPSource *src)
virtual	~qosMeasurementRecord ()
void	periodicQOSMeasurement (struct timeval const &timeNow)
Data Fields
RTPSource *	fSource
qosMeasurementRecord *	fNext
timeval measurementStartTime	measurementEndTime
double	kbits_per_second_min
double	kbits_per_second_max
double	kBytesTotal
double	packet_loss_fraction_min
double	packet_loss_fraction_max
unsigned	totNumPacketsReceived
unsigned	totNumPacketsExpected

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Detailed Description

Definition at line 924 of file playCommon.cpp.

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Constructor & Destructor Documentation

qosMeasurementRecord::qosMeasurementRecord	(	struct timeval const &	startTime,
		RTPSource *	src
	)			[inline]

Definition at line 926 of file playCommon.cpp.

References kBytesTotal, measurementEndTime, NULL, RTPSource::receptionStatsDB(), totNumPacketsExpected, totNumPacketsReceived, and True.

    : 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;

    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();
    }
  }

virtual qosMeasurementRecord::~qosMeasurementRecord

(

)

[inline, virtual]

Definition at line 943 of file playCommon.cpp.

References fNext.

{ delete fNext; }

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Member Function Documentation

void qosMeasurementRecord::periodicQOSMeasurement

(

struct timeval const &

timeNow

)

Definition at line 991 of file playCommon.cpp.

References NULL, totNumPacketsReceived, and True.

                                                      {
  unsigned secsDiff = timeNow.tv_sec - measurementEndTime.tv_sec;
  int usecsDiff = timeNow.tv_usec - measurementEndTime.tv_usec;
  double timeDiff = secsDiff + usecsDiff/1000000.0;
  measurementEndTime = timeNow;

  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;
    }
  }
}

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Field Documentation

RTPSource* qosMeasurementRecord::fSource

Definition at line 948 of file playCommon.cpp.

qosMeasurementRecord* qosMeasurementRecord::fNext

Definition at line 949 of file playCommon.cpp.

Referenced by beginQOSMeasurement(), printQOSData(), and ~qosMeasurementRecord().

struct timeval measurementStartTime qosMeasurementRecord::measurementEndTime [read]

Definition at line 952 of file playCommon.cpp.

Referenced by printQOSData(), and qosMeasurementRecord().

double qosMeasurementRecord::kbits_per_second_min

Definition at line 953 of file playCommon.cpp.

Referenced by printQOSData().

double qosMeasurementRecord::kbits_per_second_max

Definition at line 953 of file playCommon.cpp.

Referenced by printQOSData().

double qosMeasurementRecord::kBytesTotal

Definition at line 954 of file playCommon.cpp.

Referenced by printQOSData(), and qosMeasurementRecord().

double qosMeasurementRecord::packet_loss_fraction_min

Definition at line 955 of file playCommon.cpp.

Referenced by printQOSData().

double qosMeasurementRecord::packet_loss_fraction_max

Definition at line 955 of file playCommon.cpp.

Referenced by printQOSData().

unsigned qosMeasurementRecord::totNumPacketsReceived

Definition at line 956 of file playCommon.cpp.

Referenced by printQOSData(), and qosMeasurementRecord().

unsigned qosMeasurementRecord::totNumPacketsExpected

Definition at line 956 of file playCommon.cpp.

Referenced by printQOSData(), and qosMeasurementRecord().

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The documentation for this class was generated from the following file:

• testProgs/playCommon.cpp

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