Jaroslav Kysela kirjoitti: > On Mon, 19 Nov 2007, Heikki Lindholm wrote: > >> Heikki Lindholm kirjoitti: >>> Hello list, >>> >>> I took up some old dusty code of mine that uses snd_pcm_state followed >>> by snd_pcm_status_get_tstamp when in capture mode. The code used to >>> work, but now the returned timestamps are all zeroes. Is there some API >>> change done recently or is the whole timestamping deprecated or >>> something? I've tried with different drivers on ubuntu's alsa .14 and >>> gentoo's .14. I've also tried mmap'ed and r/w modes, and I'm setting the >>> TSTAMP_MMAP sw param. >> I figured out that this doesn't happen when using hw:x,y devices. Is it >> a documented feature that some (software?) devices don't fill in timestamps? > > I think that it should be fixed. Could you send us 'snd_pcm_dump()' for a > non-working device? It's probably ommited code in direct pcm plugins (dmix > & etc.). Here goes. The driver is snd_aoa. It seems as if the timestamp mode isn't propagated to the hw device. Plug PCM: Rate conversion PCM (48000, sformat=S16_BE) Its setup is: stream : CAPTURE access : RW_INTERLEAVED format : S16_BE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 15052 period_size : 940 period_time : 21333 tick_time : 0 tstamp_mode : MMAP period_step : 1 sleep_min : 0 avail_min : 940 xfer_align : 940 start_threshold : 1 stop_threshold : 15052 silence_threshold: 0 silence_size : 0 boundary : 4236761349448794112 Slave: Direct Snoop PCM Its setup is: stream : CAPTURE access : MMAP_INTERLEAVED format : S16_BE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 16 buffer_size : 16384 period_size : 1024 period_time : 21333 tick_time : 0 tstamp_mode : MMAP period_step : 1 sleep_min : 0 avail_min : 1024 xfer_align : 1024 start_threshold : 1 stop_threshold : 16384 silence_threshold: 0 silence_size : 0 boundary : 4611686018427387904 Hardware PCM card 0 'SoundByLayout' device 0 subdevice 0 Its setup is: stream : CAPTURE access : MMAP_INTERLEAVED format : S16_BE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 16 buffer_size : 16384 period_size : 1024 period_time : 21333 tick_time : 1000 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 1024 xfer_align : 1024 start_threshold : 1 stop_threshold : 4611686018427387904 silence_threshold: 0 silence_size : 0 boundary : 4611686018427387904 -- Heikki Lindholm _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
