On Mon, Feb 18, 2008 at 10:37:09PM +0200, Tanu Kaskinen wrote: > If I understood you correctly, then the answer is that there > is no "final hardware matching stage". In your example the > sound card reports that it uses sampling rate of 48000 Hz, > and pulseaudio trusts that it's correct information. If it's > not, then the sound is played slightly too fast or too > slowly. The small deviation is taken into account only when > there are multiple clocks, for example two sound cards, and > even then the correction is not based on actual time, but > just the observed difference in the clocks. > > So resampling is always done only once (afaik). I take back what I said about multiple clocks. Firstly, in that case resampling seems to happen twice, and secondly I'm not so sure what module-combine keeps as the reference clock. All streams created by it have a fluctuating sample rate... The normal one-card operation uses only one resampling phase, though, and the target rate is whatever the card is configured to use. -- Tanu Kaskinen
