Alsa, Kernel OSS

Alsa, Kernel OSS

[Marc Giger]

Hi Jaroslav, Hi everyone,

I have the following problem with Kernel 2.4.20 and the alsa 0.9.0_rc6 / rc7 drivers:

When I try to load the snd-intel8x0 driver I get the message that no such device is installed. But when I first load the kernel i810_audio driver and then unload it again, I can load the snd-intel8x0 without any problems....

This happened not with 2.4.19 and alsa < 0.9.0_rc6..

Another question:

Why can't I play more than one sources on the same time with such a card? All programs which would access /dev/dsp blocks until the other programs frees the device... It isn't very useful.

I have no such problems with multiple sources as example on my SBLive or on my yamaha sound card with the snd-ymfpci driver.

Do I miss some settings?

Thank you!

Marc

Re: Alsa, Kernel OSS

[Takashi Iwai]

At Sat, 1 Mar 2003 23:17:46 +0100,
Marc Giger wrote:
> 
> Hi Jaroslav, Hi everyone,
> 
> I have the following problem with Kernel 2.4.20 and the alsa
> 0.9.0_rc6 / rc7 drivers: 
> 
> When I try to load the snd-intel8x0 driver I get the message that no
> such device is installed. But when I first load the kernel i810_audio
> driver and then unload it again, I can load the snd-intel8x0 without
> any problems.... 

this might be due to the detection of modem codec.
if so, this was fixed on the ALSA cvs.  please try ALSA cvs version or
wait for the next ALSA patchset...


> This happened not with 2.4.19 and alsa < 0.9.0_rc6..
> 
> Another question:
> 
> Why can't I play more than one sources on the same time with such a
> card? All programs which would access /dev/dsp blocks until the other
> programs frees the device... It isn't very useful. 
> 
> I have no such problems with multiple sources as example on my
> SBLive or on my yamaha sound card with the snd-ymfpci driver. 
> 
> Do I miss some settings?

no, it's the hardware limitation.


Takashi

Re: Alsa, Kernel OSS

[Marc Giger]

Hi Takashi,

On Mon, 03 Mar 2003 16:28:11 +0100
Takashi Iwai <tiwai@suse.de> wrote:

> At Sat, 1 Mar 2003 23:17:46 +0100,
> Marc Giger wrote:
> > 
> > Hi Jaroslav, Hi everyone,
> > 
> > I have the following problem with Kernel 2.4.20 and the alsa
> > 0.9.0_rc6 / rc7 drivers: 
> > 
> > When I try to load the snd-intel8x0 driver I get the message that no
> > such device is installed. But when I first load the kernel i810_audio
> > driver and then unload it again, I can load the snd-intel8x0 without
> > any problems.... 
> 
> this might be due to the detection of modem codec.
> if so, this was fixed on the ALSA cvs.  please try ALSA cvs version or
> wait for the next ALSA patchset...

Ok, I will wait..

> 
> 
> > This happened not with 2.4.19 and alsa < 0.9.0_rc6..
> > 
> > Another question:
> > 
> > Why can't I play more than one sources on the same time with such a
> > card? All programs which would access /dev/dsp blocks until the other
> > programs frees the device... It isn't very useful. 
> > 
> > I have no such problems with multiple sources as example on my
> > SBLive or on my yamaha sound card with the snd-ymfpci driver. 
> > 
> > Do I miss some settings?
> 
> no, it's the hardware limitation.

Ok, I see..cheap hardware..

But multiple sources on window$ works..
In this case, windows mixes the sources in software - right?
Is it a big "problem" to do this also in Linux?
This would be an interesting work for me:-)
Perhaps a program as interface between userspace and alsa-driver? Or better directly in the alsa-driver?

Thank you very much!

Marc

> 
> 
> Takashi
> 

Re: Alsa, Kernel OSS

[Takashi Iwai]

At Mon, 3 Mar 2003 17:09:46 +0100,
Marc Giger wrote:
> 
> > > Why can't I play more than one sources on the same time with such a
> > > card? All programs which would access /dev/dsp blocks until the other
> > > programs frees the device... It isn't very useful. 
> > > 
> > > I have no such problems with multiple sources as example on my
> > > SBLive or on my yamaha sound card with the snd-ymfpci driver. 
> > > 
> > > Do I miss some settings?
> > 
> > no, it's the hardware limitation.
> 
> Ok, I see..cheap hardware..
> 
> But multiple sources on window$ works..
> In this case, windows mixes the sources in software - right?

yes.

> Is it a big "problem" to do this also in Linux?
> This would be an interesting work for me:-)
> Perhaps a program as interface between userspace and alsa-driver?

the latest alsa-lib supports the dynamic software mixing.
it works like a charm :)

> Or better directly in the alsa-driver? 

no, basically it's a user-space job.


ciao,

Takashi