On Wed, 26 Sep 2001, toby wrote:
> Robert Voigt wrote:
> >
> > Hi,
> > I have a Delta Dio 2496 and alsa 0.9.0beta7. There are gaps in the sound when
> > I switch between windows, but also when I watch movies with aviplayer.
>
> I'm glad to hear that I am not the only one that has this problem.
> I have a Midiman Delta44, and it has always given me the gap proplem.
> Under windows, it seems to have been solved through the use of ASIO drivers.
> I worked with O$$ support with this for weeks. They came up with three
> new betas in response to my problem, always claiming that they had
> found the problem, and fixed it. I was never able to multitrack with
> this card, although I have no problems with SBLive, AudioPCI, etc.
> I have tried two computers. I'm running a 450mHz PIII, with new
> IDE disks using DMA and multi sector read and all that hdparm can do.
> I've patched my kernel for low latency, and tried running with nice -20.
> The video does seem to aggravate it, but I also have the problem with
> command line players remotely. With latest ALSA cvs, it is *almost*
> perfect, but I get a dropout about once a minute or so. They are
> very short, but I can't use this card for recording until I can be
> certain that I will get a clean file. So, for now, I have to boot
> window$ in order to record.
>
> It is frustrating, because ALSA support for the card is so very exceptional
> otherwise.
You need implement probably double buffering scheme with minimum sample
copying to clean record on slower hardware (try ecasound). It doesn't have
anything related with the sound drivers but overall system performance.
Don't forget that we're always using 10 channels (it's 5 times more than
standard stereo cards). On the other hand, if anyone implements better
optimization code for such schemes to the kernel's OSS emulation code, the
behaviour can be better.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
SuSE Linux http://www.suse.com
ALSA project http://www.alsa-project.org
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