Hi Jaroslav, Just to let you know I'm running this on Ubuntu 7.10 (alsa-lib-1.0.14), though I've been seeing this underrun problem for a while on a few systems (Ubuntu 7.04/6.10, and Gentoo 2006.1). It hasn't been clear to me what the key parameters are that control underrun behaviour. (It would be great if someone wrote a comprehensive book/article on ALSA....) BTW you mentioned doing the rate resampling in RAT - which it can do - how does one discover if rate conversion is occurring in ALSA and obtain that 'base' rate? (Though I has assumed that ALSA would do the better job of rate resampling if it was necessary...). Thanks, Piers. On 09/11/2007, Jaroslav Kysela <perex@xxxxxxxx> wrote: > On Fri, 9 Nov 2007, Piers O'Hanlon wrote: > > > ===snd_pcm_dump_setup:=============== > > stream : PLAYBACK > > access : RW_INTERLEAVED > > format : S16_LE > > subformat : STD > > channels : 1 > > rate : 16000 > > exact rate : 16000 (16000/1) > > msbits : 16 > > buffer_size : 2048 > > period_size : 341 > > period_time : 21333 > > tick_time : 0 > > tstamp_mode : NONE > > period_step : 1 > > sleep_min : 0 > > avail_min : 341 > > xfer_align : 1 > > start_threshold : 341 > > stop_threshold : 2048 > > silence_threshold: 0 > > silence_size : 0 > > boundary : 536870912 > > Could you do whole dump (snd_pcm_dump()) to see all plugins in chain? > I judge from period_size that we have another problem with rate plugin. > It would be better to do rate resampling in RAT. > > Jaroslav > > ----- > Jaroslav Kysela <perex@xxxxxxxx> > Linux Kernel Sound Maintainer > ALSA Project > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
