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small fix for auto jitter buffer setting

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This commit is contained in:
Volker Fischer 2009-03-18 07:24:53 +00:00
parent 9dd942bec6
commit 564d54f68c
2 changed files with 8 additions and 7 deletions
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5
src/channel.cpp
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@ -1130,7 +1130,10 @@ EPutDataStat CChannel::PutData ( const CVector<unsigned char>& vecbyData,
// re-initialization, too, if necessary
if ( iAudioSize != CycleTimeVariance.GetBlockLength() )
{
// re-init
// re-init (we have to use the buffer size which works
// on the system sample rate, therefore we use the
// decompressed audio buffer size instead of the network
// buffer size)
CycleTimeVariance.Init ( iAudioSize, TIME_MOV_AV_RESPONSE );
CycleTimeVariance.Reset();
}

10
src/client.cpp
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@ -443,11 +443,9 @@ void CClient::UpdateSocketBufferSize()
{
// We use the time response measurement for the automatic setting.
// Assumptions:
// - the network jitter can be neglected compared to the audio
// interface jitter
// - the audio interface jitter is assumed to be Gaussian
// - the buffer size is set to two times the standard deviation of
// the audio interface jitter (~95% of the jitter should be fit in the
// - the audio interface/network jitter is assumed to be Gaussian
// - the buffer size is set to 2.3 times the standard deviation of
// the jitter (~90% of the jitter should be fit in the
// buffer)
// - introduce a hysteresis to avoid switching the buffer sizes all the
// time in case the time response measurement is close to a bound
@ -471,7 +469,7 @@ void CClient::UpdateSocketBufferSize()
// divide by MIN_SERVER_BLOCK_DURATION_MS because this is the size of
// one block in the jitter buffer
const double dEstCurBufSet = ( dAudioBufferDurationMs +
2 * ( Channel.GetTimingStdDev() + CycleTimeVariance.GetStdDev() + 0.5 ) ) /
2.3 * ( Channel.GetTimingStdDev() + CycleTimeVariance.GetStdDev() + 0.5 ) ) /
MIN_SERVER_BLOCK_DURATION_MS;
// upper/lower hysteresis decision