[pulseaudio-discuss] [PATCH] sample-rate changes in module-rtp-recv

pl bossart bossart.nospam at gmail.com
Mon Apr 5 12:23:50 PDT 2010

I did some testing on our LAN with one laptop sending audio over rtp
and the other receiving the data and playing it locally. The
estimation of timing is very jittery, and the sampling rate is changed
in very large steps (eg. 44.1->53kHz). The current code allows for 50%
increases without setting a maximum bound. The result is audible pitch
changes every 5s; this is very disturbing on cords and other tonal
This patch forces additional smoothing and clamps possible variations
of sampling rate at 1% of the nominal rate defined in the sdp session.
Ideally we should enforce a stronger smoothing on the time estimation,
there's no reason why such variations should occur. I forced the
smoothing history to 20s, maybe there's a better way to do this.
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