Daniel,
The "src-linear" resampler (current setting in Jaunty) is really awful,
too. It causes crackles for certain ranges in audio (e.g. explosions);
by crackles I mean resampling artifacts, not stuttering or buffering
problems. These crackles never occurred with ALSA's default dmix, and I
mentioned some of my results regarding the different resamplers in the
comments of bug #190754.
My understanding is that this is the rough "ranking" of resamplers, from
best to worst (with CPU usage following the same trend, from high to
low): src-sinc-best-quality, src-sinc-medium-quality, src-sinc-fastest,
speex-float-{10-0}, speex-fixed-{10-0}, ffmpeg, src-zero-order-hold,
src-linear, trivial.
As you can see, we're currently using the second-worst resampler. From
personal testing, my conclusion was that speex-float-1 was the best
resampler that balanced low CPU usage with audio quality (no distortion
or crackles at certain ranges). For all the resamplers from speex-
float-0 and below, crackles occured on both of my systems (using
different codecs of snd-intel8x0).
I suggest if you have time (and find some appropriate audio samples),
you test some of the resamplers to find the optimal default in
PulseAudio.
--
Crackling / scratching noise using Pulseaudio
https://bugs.launchpad.net/bugs/345627
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