Jaroslav Kysela wrote: >> Which gives threshold = 6552 from buffer=6553, period=3276... >> exactly the same value as the code I was already using gives! What >> else am I missing from the garish red and yellow blocks of WinDiff? > Then it really appears like a bug. Could you add snd_pcm_dump() call > just before the block occurs?
Sure... but it doesn't seem to show any anomalies... I've also included the matching status report from /proc... state: PREPARED trigger_time: 1081246741.324684000 tstamp : 1081246792.298694000 delay : 0 avail : 8 avail_max : 7229 ----- hw_ptr : 0 appl_ptr : 6545 -------------- Hardware PCM card 0 'Hoontech SoundTrack Audio DSP24' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S32_LE subformat : STD channels : 10 rate : 88200 exact rate : 88200 (88200/1) msbits : 24 buffer_size : 6553 period_size : 3276 period_time : 37142 tick_time : 1000 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 3276 xfer_align : 1 start_threshold : 6552 stop_threshold : 6553 silence_threshold: 0 silence_size : 0 boundary : 1717829632 >> Why does changing to mmap writes make the blocking problem go away? >> And as I said, the problem only has been made to occur at 88.2 and >> 96K sampling rates... > mmap does never block That'd explain why it doesn't halt like snd_pcm_writei, then... :) ... but if it was having to throw away data, surely wouldn't it drop out when I swap in mmap? Because it doesn't... snd_pcm_mmap_writei *seems* to work perfectly... I'm suspecting an "off by one" calculation error somewhere. - Tom. ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
