From mboxrd@z Thu Jan 1 00:00:00 1970 From: Piers O'Hanlon Subject: Re: Getting XRUN after writei in RUNNING state? Date: Fri, 09 Nov 2007 17:07:19 +0000 Message-ID: <473493C7.1030800@cs.ucl.ac.uk> References: <47348C2D.7020509@cs.ucl.ac.uk> Reply-To: p.ohanlon@cs.ucl.ac.uk Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from bells.cs.ucl.ac.uk (bells.cs.ucl.ac.uk [128.16.5.31]) by alsa0.perex.cz (Postfix) with SMTP id 75B22244B2 for ; Fri, 9 Nov 2007 18:07:59 +0100 (CET) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Jaroslav Kysela Cc: ALSA development List-Id: alsa-devel@alsa-project.org Hi, Thanks for getting back me. Jaroslav Kysela wrote: > On Fri, 9 Nov 2007, Piers O'Hanlon wrote: > .... > > 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. > I set the period size to the match the closest to the expected minimum audio packet size (20ms - 320 bytes in our case) - I wasn't sure the best choice for all parameters. I initially set the buffer size to approx 3 packets - though I tried increasing to twice that. It just wasn't clear which parameters were causing it to go into XRUN (I also set the stop threshold to maximum to make sure it was the stop threshold - though I guess it it overrun the buffer size we'll get audio from the beginning of the ring buffer anyway wthat wouldn't sound too good) (snd_pcm_dump()) is below: Plug PCM: Rate conversion PCM (48000, sformat=S16_LE) Its setup is: 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 Slave: Route conversion PCM (sformat=S16_LE) Transformation table: 0 <- 0 1 <- 0 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S16_LE subformat : STD channels : 1 rate : 48000 exact rate : 48000 (48000/1) msbits : 16 buffer_size : 6144 period_size : 1024 period_time : 21333 tick_time : 0 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 1024 xfer_align : 3 start_threshold : 1024 stop_threshold : 6144 silence_threshold: 0 silence_size : 0 boundary : 1610612736 Slave: Direct Stream Mixing PCM Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 16 buffer_size : 6144 period_size : 1024 period_time : 21333 tick_time : 0 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 1024 xfer_align : 3 start_threshold : 1024 stop_threshold : 6144 silence_threshold: 0 silence_size : 0 boundary : 1610612736 Hardware PCM card 0 'AMD AMD8111' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 16 buffer_size : 16384 period_size : 1024 period_time : 21333 tick_time : 4000 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 1024 xfer_align : 1024 start_threshold : 1 stop_threshold : 1073741824 silence_threshold: 0 silence_size : 1073741824 boundary : 1073741824 > Jaroslav > > ----- > Jaroslav Kysela > Linux Kernel Sound Maintainer > ALSA Project >