Problem with multiplexing

Problem with multiplexing

[Marco Canini]

Please gimme an answer!

I've a CS4624 sound card, i compiled the kernel 2.5.68 with ALSA all
built-in (no modules), i choosed to compile the following:

Sequencer support
OSS API emulation
OSS Mixer API
OSS PCM (digital audio) API
RTC Timer support

PCI devices -> Cirrus Logic (Sound Fusion) CS4280/CS461x/CS462x/CS463x

I don't use devfs, so i created the needed devices trough the proper
script, and i can actually get sound from native alsa apps and oss apps.

What i can't get to work is the multiplexing: i mean whan more than one
app open /dev/dsp and i can listen more than one audio stream at the
same time.

I tried today on another machine with a sb live and without alsa, well
there it works!

I thought that alsa do some sort of software multiplexing if the
hardware multiplexing is unavailable.

Anyway do you have some ideas of what's going on here?

-- 
Marco Canini <m.canini@libero.it>



-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
The only event dedicated to issues related to Linux enterprise solutions
www.enterpriselinuxforum.com

Re: Problem with multiplexing

[Takashi Iwai]

At 16 May 2003 00:36:38 +0200,
Marco Canini wrote:
> 
> Please gimme an answer!
> 
> I've a CS4624 sound card, i compiled the kernel 2.5.68 with ALSA all
> built-in (no modules), i choosed to compile the following:
> 
> Sequencer support
> OSS API emulation
> OSS Mixer API
> OSS PCM (digital audio) API
> RTC Timer support
> 
> PCI devices -> Cirrus Logic (Sound Fusion) CS4280/CS461x/CS462x/CS463x
> 
> I don't use devfs, so i created the needed devices trough the proper
> script, and i can actually get sound from native alsa apps and oss apps.
> 
> What i can't get to work is the multiplexing: i mean whan more than one
> app open /dev/dsp and i can listen more than one audio stream at the
> same time.
> 
> I tried today on another machine with a sb live and without alsa, well
> there it works!
> 
> I thought that alsa do some sort of software multiplexing if the
> hardware multiplexing is unavailable.
> 
> Anyway do you have some ideas of what's going on here?

the latest driver supports multiple playback on this chip but only
with the new DSP code.  please turn on CONFIG_SND_CS46XX_NEW_DSP
(still tagged experimental).


Takashi


-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
The only event dedicated to issues related to Linux enterprise solutions
www.enterpriselinuxforum.com

Re: Problem with multiplexing

[Marco Canini]

On Fri, 2003-05-16 at 11:30, Takashi Iwai wrote:
> At 16 May 2003 00:36:38 +0200,
> Marco Canini wrote:
> > 
> > Please gimme an answer!
> > 
> > I've a CS4624 sound card, i compiled the kernel 2.5.68 with ALSA all
> > built-in (no modules), i choosed to compile the following:
> > 
> > Sequencer support
> > OSS API emulation
> > OSS Mixer API
> > OSS PCM (digital audio) API
> > RTC Timer support
> > 
> > PCI devices -> Cirrus Logic (Sound Fusion) CS4280/CS461x/CS462x/CS463x
> > 
> > I don't use devfs, so i created the needed devices trough the proper
> > script, and i can actually get sound from native alsa apps and oss apps.
> > 
> > What i can't get to work is the multiplexing: i mean whan more than one
> > app open /dev/dsp and i can listen more than one audio stream at the
> > same time.
> > 
> > I tried today on another machine with a sb live and without alsa, well
> > there it works!
> > 
> > I thought that alsa do some sort of software multiplexing if the
> > hardware multiplexing is unavailable.
> > 
> > Anyway do you have some ideas of what's going on here?
> 
> the latest driver supports multiple playback on this chip but only
> with the new DSP code.  please turn on CONFIG_SND_CS46XX_NEW_DSP
> (still tagged experimental).
> 
Thanks a lot.
I've enabled it and now i can experience hardware mixing.
It's still tagged experimental but what do you think about its
stability?

> 
> Takashi
> 
> 
> -------------------------------------------------------
> Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
> The only event dedicated to issues related to Linux enterprise solutions
> www.enterpriselinuxforum.com
> 
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/alsa-devel
-- 
Marco Canini <m.canini@libero.it>



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