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Fixed a Flush/Start initialization bug in the jitter buffer. Also cleaned

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up "Nack estimate".
Review URL: http://webrtc-codereview.appspot.com/32009

git-svn-id: http://webrtc.googlecode.com/svn/trunk@78 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
holmer@google.com
2011-06-15 07:37:08 +00:00
parent 2204835d4d
commit 51f2453d98
3 changed files with 34 additions and 43 deletions
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35
modules/video_coding/main/source/jitter_estimator.cc
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@@ -28,9 +28,7 @@ _psi(0.9999),
_alphaCountMax(400),
_beta(0.9994),
_thetaLow(0.000001),
_nackLimit(3), // This should be 1 if the old
// retransmition estimate is used.
_nackWindowMS(15000),
_nackLimit(3),
_numStdDevDelayOutlier(15),
_numStdDevFrameSizeOutlier(3),
_noiseStdDevs(2.33), // ~Less than 1% chance
@@ -213,33 +211,18 @@ VCMJitterEstimator::UpdateEstimate(WebRtc_Word64 frameDelayMS, WebRtc_UWord32 fr
// Updates the nack/packet ratio
void
VCMJitterEstimator::UpdateNackEstimate(bool retransmitted, WebRtc_Word64 /*wallClockMS = -1*/)
VCMJitterEstimator::FrameNacked()
{
// Simplified since it seems to be hard to be sure if a
// packet actually has been retransmitted or not, resulting
// in a delay which varies up and down with one RTT.
// The solution is to wait until _nackLimit retransmitts
// has been received, then always add an RTT to the estimate.
if (retransmitted && _nackCount < _nackLimit)
// Wait until _nackLimit retransmissions has been received,
// then always add ~1 RTT delay.
// TODO(holmer): Should we ever remove the additional delay if the
// the packet losses seem to have stopped? We could for instance scale
// the number of RTTs to add with the amount of retransmissions in a given
// time interval, or similar.
if (_nackCount < _nackLimit)
{
_nackCount++;
}
//if (wallClockMS == -1)
//{
// wallClockMS = VCMTickTime::MillisecondTimestamp();
//}
//if (retransmitted)
//{
// if (_nackCount < _nackLimit)
// {
// _nackCount++;
// }
// _latestNackTimestamp = wallClockMS;
//}
//else if (_nackCount > 0 && wallClockMS - _latestNackTimestamp > _nackWindowMS)
//{
// _nackCount = 0;
//}
}
// Updates Kalman estimate of the channel