On Tue, 25 May 2004, Giuliano Pochini wrote:
> On Sun, 23 May 2004 11:21:41 +0200 (CEST)
> Jaroslav Kysela <[EMAIL PROTECTED]> wrote:
>
> > On Sat, 22 May 2004, Giuliano Pochini wrote:
> >
> > > Period 0 is 6624 frames and Period 1 is 6592 frames long (32 frames
> > > shorter). I put some debug code and this is the output for a the playback
> > > test above:
> >
> > ALSA does not know about this. All period sizes must be equal.
>
> I thought about this again. Are you sure all periods must be aqual ?
> When I record or play something using unequal periods, sound is perfect.
> It means ALSA reads and writes the last (sometimes a lot) smaller period
> as well.
The driver must not acknowledge the settled period with the midlevel and
application before the specified time. Of course, if you're running into
a rounding problem, you can acknowledge more periods at one time.
In other cases, it's not very practical to program hardware to use
different period sizes, because you need more interrupts for processing.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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