[nas] multiple dsp devices under linux?
jon at radscan.com
Thu Jan 10 22:05:22 MST 2002
On Thu, 10 Jan 2002, Paul Fox wrote:
> Date: Thu, 10 Jan 2002 08:11:18 -0500
> From: Paul Fox <pgf at foxharp.boston.ma.us>
> To: nas at radscan.com
> Subject: Re: [nas] multiple dsp devices under linux?
> > > beep_device: <dsp device>
> > > The sound device through which to play the beep sounds.
> > > This cannot be the same device which mpg123 uses. I
> > > use /dev/dsp1. Note that most sound drivers provide
> > > multiple dsp devices.
> > >
> > > the last line is news to me. in particular, i would like
> > > very much to run the nas server on one audio device, and
> > > have a second device available for use by non-nas-aware
> > > applications. is it really true that most linux sound
> > > drivers have multiple entry points?
> > No, when they say device, I'm pretty sure they mean hardware device.
> > For example, if you have two physical sound cards, then one will be
> > /dev/dsp, and the other will be /dev/dsp1. I don't think you are
> > suggesting getting a second sound card just to support non-NAS program.
> no, i'm not suggesting that. by the same token i'm kind of
> surprised that _they're_ suggesting a second audio card just
> for beeps. :-) (i haven't gotte a response back from those
> developers yet -- maybe the second device is meant to be a
> pc-speaker pseudo sounddriver.)
Under OSS, nasd (and other apps) seem to use /dev/dsp1 as the
> > To suggest a different solution, have you played with audiooss? Despite
> > the warning on that config line, you should be able to just specify
> > /dev/dsp if you are running the program under audiooss. (Although IMHO,
> > it's too bad they don't ask for a beep *command*!)
> as it happens, the two programs i'm trying to run are both
> NAS-enabled, and i have to have nas running for one of them,
> but the other (mpg123) is running locally, and it just
> seemed like it would be more efficient (fewer cpu cycles),
> and suffer fewer latency issues (like the too-much-data-
> buffered-when-i-pause problem i mentioned in a different
> email), if it were accessing the device directly rather than
> going through the extra server process.
I wanted to ask you about that (latency), I'll do that in another
Jon Trulson mailto:jon at radscan.com
ID: 1A9A2B09, FP: C23F328A721264E7 B6188192EC733962
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Bad Color Temperature, Too much Peach.
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