[alsa-devel] plug:dmix slows playback

[Steve Langstaff]

> From: alsa-devel-bounces at alsa-project.org [mailto:alsa-devel-
> bounces at alsa-project.org] On Behalf Of Jaroslav Kysela
> On Fri, 12 Jun 2009, Steve Langstaff wrote:
> 
> >> From: alsa-devel-bounces at alsa-project.org [mailto:alsa-devel-
> >> bounces at alsa-project.org] On Behalf Of Jaroslav Kysela
> >
> >> On Fri, 12 Jun 2009, Steve Langstaff wrote:
> >
> >>> Slave: Hardware PCM card 0 'LM4549' device 0 subdevice 0
> >>
> >>>  msbits       : 16
> >>
> >> If I remember correctly, this value was 32 in your dmix setup.
> >> Could you try command:
> >>
> >>  	aplay -D"plug:'dmix:FORMAT=S16_LE'" <filename>
> >
> > Yes, that works fine - is there something wrong with my configuration
> do you
> > think?
> 
> It seems that 32-bit samples are not handled correctly in driver.
> What's your hardware? Output from alsa-info.sh script might be helpful
> for
> identification.

I don't have alsa-info.sh installed, but here is the hardware info that I
can glean...

~ # aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: LM4549 [LM4549], device 0: PXA2xx-PCM []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

~ # lsmod |fgrep snd
snd_page_alloc          6684  1 snd_pcm
soundcore               6844  1 snd
snd                    51952  4
snd_pxa2xx_ac97,snd_ac97_codec,snd_pcm,snd_timer
snd_timer              21340  1 snd_pcm
snd_pcm                73449  4
snd_pxa2xx_ac97,snd_ac97_codec,snd_pxa2xx_pcm,snd_pxa2xx_lib
snd_pxa2xx_lib         10748  2 snd_pxa2xx_ac97,snd_pxa2xx_pcm
snd_pxa2xx_pcm          2536  1 snd_pxa2xx_ac97
ac97_bus                1716  1 snd_ac97_codec
snd_ac97_codec        105828  1 snd_pxa2xx_ac97
snd_pxa2xx_ac97         4236  0