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fix for auto jitter buffer for 64 samples frame size

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This commit is contained in:
Volker Fischer 2020-04-16 18:40:29 +02:00
parent ad3e4e0587
commit 07bf588ba4
2 changed files with 22 additions and 12 deletions
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18
src/buffer.cpp
View file

@ -97,7 +97,9 @@ CNetBufWithStats::CNetBufWithStats() :
dAutoFilt_WightUpNormal ( IIR_WEIGTH_UP_NORMAL ),
dAutoFilt_WightDownNormal ( IIR_WEIGTH_DOWN_NORMAL ),
dAutoFilt_WightUpFast ( IIR_WEIGTH_UP_FAST ),
dAutoFilt_WightDownFast ( IIR_WEIGTH_DOWN_FAST )
dAutoFilt_WightDownFast ( IIR_WEIGTH_DOWN_FAST ),
dErrorRateBound ( ERROR_RATE_BOUND ),
dUpMaxErrorBound ( UP_MAX_ERROR_BOUND )
{
// Define the sizes of the simulation buffers,
// must be NUM_STAT_SIMULATION_BUFFERS elements!
@ -135,8 +137,8 @@ void CNetBufWithStats::GetErrorRates ( CVector<double>& vecErrRates,
}
// get the limits for the decisions
dLimit = ERROR_RATE_BOUND;
dMaxUpLimit = UP_MAX_ERROR_BOUND;
dLimit = dErrorRateBound;
dMaxUpLimit = dUpMaxErrorBound;
}
void CNetBufWithStats::Init ( const int iNewBlockSize,
@ -157,6 +159,8 @@ void CNetBufWithStats::Init ( const int iNewBlockSize,
dAutoFilt_WightUpFast = IIR_WEIGTH_UP_FAST_DOUBLE_FRAME_SIZE;
dAutoFilt_WightDownFast = IIR_WEIGTH_DOWN_FAST_DOUBLE_FRAME_SIZE;
iMaxStatisticCount = MAX_STATISTIC_COUNT_DOUBLE_FRAME_SIZE;
dErrorRateBound = ERROR_RATE_BOUND_DOUBLE_FRAME_SIZE;
dUpMaxErrorBound = UP_MAX_ERROR_BOUND_DOUBLE_FRAME_SIZE;
}
else
{
@ -165,6 +169,8 @@ void CNetBufWithStats::Init ( const int iNewBlockSize,
dAutoFilt_WightUpFast = IIR_WEIGTH_UP_FAST;
dAutoFilt_WightDownFast = IIR_WEIGTH_DOWN_FAST;
iMaxStatisticCount = MAX_STATISTIC_COUNT;
dErrorRateBound = ERROR_RATE_BOUND;
dUpMaxErrorBound = UP_MAX_ERROR_BOUND;
}
for ( int i = 0; i < NUM_STAT_SIMULATION_BUFFERS; i++ )
@ -248,7 +254,7 @@ void CNetBufWithStats::UpdateAutoSetting()
for ( int i = 0; i < NUM_STAT_SIMULATION_BUFFERS - 1; i++ )
{
if ( ( !bDecisionFound ) &&
( ErrorRateStatistic[i].GetAverage() <= ERROR_RATE_BOUND ) )
( ErrorRateStatistic[i].GetAverage() <= dErrorRateBound ) )
{
iCurDecision = viBufSizesForSim[i];
bDecisionFound = true;
@ -272,7 +278,7 @@ void CNetBufWithStats::UpdateAutoSetting()
for ( int i = 0; i < NUM_STAT_SIMULATION_BUFFERS - 1; i++ )
{
if ( ( !bDecisionFound ) &&
( ErrorRateStatistic[i].GetAverage() <= UP_MAX_ERROR_BOUND ) )
( ErrorRateStatistic[i].GetAverage() <= dUpMaxErrorBound ) )
{
iCurMaxUpDecision = viBufSizesForSim[i];
bDecisionFound = true;
@ -369,7 +375,7 @@ else
{
// check error rate of the largest buffer as the indicator
if ( ErrorRateStatistic[NUM_STAT_SIMULATION_BUFFERS - 1].
GetAverage() > ERROR_RATE_BOUND )
GetAverage() > dErrorRateBound )
{
for ( int i = 0; i < NUM_STAT_SIMULATION_BUFFERS; i++ )
{

16
src/buffer.h
View file

@ -37,17 +37,23 @@
#define FILTER_DECISION_HYSTERESIS 0.1
// definition of the upper error bound of the jitter buffers
#define ERROR_RATE_BOUND 0.001
#define ERROR_RATE_BOUND_DOUBLE_FRAME_SIZE 0.001
#define ERROR_RATE_BOUND ( ERROR_RATE_BOUND_DOUBLE_FRAME_SIZE / 2 )
// definition of the upper jitter buffer error bound, if that one is reached we
// have to speed up the filtering to quickly get out of a incorrect buffer
// size state
#define UP_MAX_ERROR_BOUND 0.01
#define UP_MAX_ERROR_BOUND_DOUBLE_FRAME_SIZE 0.01
#define UP_MAX_ERROR_BOUND ( UP_MAX_ERROR_BOUND_DOUBLE_FRAME_SIZE / 2 )
// each regular buffer access lead to a count for put and get, assuming 2.66 ms
// blocks we have 15 s / 2.66 ms * 2 = approx. 11000
#define MAX_STATISTIC_COUNT_DOUBLE_FRAME_SIZE 11000
// each regular buffer access lead to a count for put and get, assuming 1.33 ms
// blocks we have 15 s / 1.33 ms * 2 = approx. 22500
#define MAX_STATISTIC_COUNT 22500
// Note that the following definitions of the weigh constants assume a block
// size of 128 samples at a sampling rate of 48 kHz.
#define IIR_WEIGTH_UP_NORMAL_DOUBLE_FRAME_SIZE 0.999995
@ -55,10 +61,6 @@
#define IIR_WEIGTH_UP_FAST_DOUBLE_FRAME_SIZE 0.9995
#define IIR_WEIGTH_DOWN_FAST_DOUBLE_FRAME_SIZE 0.999
// each regular buffer access lead to a count for put and get, assuming 1.33 ms
// blocks we have 15 s / 1.33 ms * 2 = approx. 22500
#define MAX_STATISTIC_COUNT 22500
// convert numbers from 128 samples case using http://www.tsdconseil.fr/tutos/tuto-iir1-en.pdf
// and https://octave-online.net:
// gamma = exp(-Ts/tau), after some calculations we get: x=0.999995;exp(64/128*log(x))
@ -459,6 +461,8 @@ protected:
double dAutoFilt_WightDownNormal;
double dAutoFilt_WightUpFast;
double dAutoFilt_WightDownFast;
double dErrorRateBound;
double dUpMaxErrorBound;
};