[PD-dev] alsa rme pd again

=?X-UNKNOWN?Q?g=FCnter_geiger?= geiger at xdv.org
Tue Aug 13 16:38:39 CEST 2002

On Tue, 13 Aug 2002, Orm Finnendahl wrote:

> Hello Günter,
> Am Dienstag, den 13. August 2002 um 11:15:58 Uhr (+0200) schrieb günter geiger:
> >
> > On Tue, 13 Aug 2002, Orm Finnendahl wrote:
> > > I got the new RME card and since jack doesnt't work properly on my
> > > laptop,
> >
> > What kind of problems do you have ?
> I get nasty xruns everytime, my system accesses the disk (appr. every
> 3-4 secs). I posted this to the jackit-dev list and Paul Davis replied
> stating that jack is intended as professional (sic!)  solution with
> very low latency, that he's using SCSI therefore and he didn't seem to
> care a lot. BTW: Increasing the period size doesn't help. I'll give it
> another try with a low latency patch applied to my system (Debian with
> 2.4.18). Maybe that fixes it. But for installations or concert
> situations I need a reliable system which works unattended for days
> and therefore prefer the direct way, where pd just grabs the driver.

Yes, you are definitely right, for concert situations and installations it
is the  more reliable solution.

I have heard from several sources already about  the problems they have
with jack, others OTOH say it works perfectly, I think that there is a bit
of voodoo involved in that :).

> > The ALSA code in pd is just missing the direct way, that is, sending
> > non-interleaved samples.
> Are you sure, ALSA can handle this? I thought, ALSA doesn't work with
> uninterleaved samples. If that's the case, I'd much prefer the direct
> way of course.
> Who can help in that respect? ALSA documentation is still hardly more
> than nonexistent and the API far from straightforward.

Someone with enough time, programming experience and the ultimate goal to
save the (musicians) world with free software :)
No, honestly, I have looked at the code a bit already, then I got stuck
because it is a bit a try and error sort of programming.
Now currently my desktop machine which hosts the Hammerfall is broken :(.

I think alsa offers now two different "write" and "read" functions, one
for interleaved and anotherone for non-interleaved.


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