On 19 Mar 2003, Giuliano Pochini wrote:
> > > I'm facing another *Ł%@ problem. When period size is a multiple or
> > > submultiple of PAGE_SIZE, it works fine, but when it isn't, sound
> > > clicks, pops, repeapeapeats, skps :(( And since the period never crosses
> > > physically the page boundary because I split it when it happens, I can't
> > > imagine what's wrong. Perhaps some of you had the same problem.
> > >
> > > .period callback does this:
> >
> > do you mean pointer callback?
>
> Yes, sorry.
>
> > > bufsize=substream->runtime->periods*substream->runtime->period_size;
> >
> > you already have substream->runtime->buffer_size for this.
> They are different:
>
> [aplay <no options> track.wav]
> Mar 19 19:21:23 localhost kernel: pcm_hw_params (bufsize=88200 periods=3
> persize=22052)
>
> bufsize==88200 != 3*22052 == 66156
Note that there is no guarantee that the periods == integer value.
If your hardware doesn't allow to set period_size and buffer_size
independently (if buffer_size must be multiple of period_size) then put
this code to the open callback:
if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS))
< 0)
return err;
See alsa-kernel/pci/via82xx.c for an example.
In other cases, runtime->buffer_size MUST BE USED.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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