linuxconsole-dev

multi-seat sound [again]: anybody actually doing it?

[Hugo V. <hvw...@ya...>]

Hi,

I just found out that my SB/Live 24 bit Audigy works
good with kernel 2.6.15-ck1 (did not 6 months ago with
2.6.12.11)

So that opens up the possibility of 2 audio cards for
2 simultaneous users.

This means alsa however.

Anybody run simultaneous alsa devices for different
users?

Thanks!

Hugo


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Re: multi-seat sound [again]: anybody actually doing it?

[ludovic p. <pl...@nn...>]

Hello,

For most alsa application, correctly setting the following environment=20
variable will do the trick :

ALSA_CARD=3D1
ALSA_CTL_CARD=3D1
ALSA_PCM_CARD=3D1

You can force SDL games to use alsa with :

SDL_AUDIODRIVER=3Dalsa


But applications which use the OSS API will cause problems (mozilla plugi=
ns,=20
openoffice, old games, ...)=20

For those, you will need to make the device entries point to different fi=
les=20
depending on the DISPLAY : I do that at home. Have a look at=20
http://www.nnx.com/~pludov/sessiond/

Regards,
Ludovic P

Le Samedi 14 Janvier 2006 22:17, Hugo Vanwoerkom a =E9crit :
> Hi,
>
> I just found out that my SB/Live 24 bit Audigy works
> good with kernel 2.6.15-ck1 (did not 6 months ago with
> 2.6.12.11)
>
> So that opens up the possibility of 2 audio cards for
> 2 simultaneous users.
>
> This means alsa however.
>
> Anybody run simultaneous alsa devices for different
> users?
>
> Thanks!
>
> Hugo
>
>
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Re: multi-seat sound [again]: anybody actually doing it?

[Hugo V. <hvw...@ya...>]

--- ludovic pollet <pl...@nn...> wrote:

> Hello,
> 
> For most alsa application, correctly setting the
> following environment 
> variable will do the trick :
> 
> ALSA_CARD=1
> ALSA_CTL_CARD=1
> ALSA_PCM_CARD=1
> 
> You can force SDL games to use alsa with :
> 
> SDL_AUDIODRIVER=alsa
> 
> 
> But applications which use the OSS API will cause
> problems (mozilla plugins, 
> openoffice, old games, ...) 
> 
> For those, you will need to make the device entries
> point to different files 
> depending on the DISPLAY : I do that at home. Have a
> look at 
> http://www.nnx.com/~pludov/sessiond/
> 

Indeed, I saw your page, good job!

Did you write sessiond?

Thanks!

Hugo





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Re: multi-seat sound [again]: anybody actually doing it?

[vinu <vi...@hc...>]

Hugo Vanwoerkom wrote:

>--- ludovic pollet <pl...@nn...> wrote:
>
>  
>
>>Hello,
>>
>>For most alsa application, correctly setting the
>>following environment 
>>variable will do the trick :
>>
>>ALSA_CARD=1
>>ALSA_CTL_CARD=1
>>ALSA_PCM_CARD=1
>>
>>You can force SDL games to use alsa with :
>>
>>SDL_AUDIODRIVER=alsa
>>
>>
>>But applications which use the OSS API will cause
>>problems (mozilla plugins, 
>>openoffice, old games, ...) 
>>
>>For those, you will need to make the device entries
>>point to different files 
>>depending on the DISPLAY : I do that at home. Have a
>>look at 
>>http://www.nnx.com/~pludov/sessiond/
>>
>>    
>>
>
>Indeed, I saw your page, good job!
>
>Did you write sessiond?
>
>Thanks!
>
>Hugo
>
>
>
>
>
>__________________________________________________
>Do You Yahoo!?
>Tired of spam?  Yahoo! Mail has the best spam protection around 
>http://mail.yahoo.com 
>
>
>-------------------------------------------------------
>This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
>for problems?  Stop!  Download the new AJAX search engine that makes
>searching your log files as easy as surfing the  web.  DOWNLOAD SPLUNK!
>http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click
>_______________________________________________
>Linuxconsole-dev mailing list
>Lin...@li...
>https://lists.sourceforge.net/lists/listinfo/linuxconsole-dev
>
>  
>
A few months ago i had made a similar setup, but with shell script only, 
but i used an alsa imulation of oss, and was working fine. after some 
times i tried with the flash plugin for firefox, but wat happened is 
only if v play some sound apps, using firefox, only one user can use it. 
the other users will not b able to use the sound device, whatever be the 
mapping. So we just tracked the working of the plugin and foundout that 
it's creating a lock on the /tmp device which v cannot remove. So what v 
had done is on each session creation the /tmp will be mounted locally 
and do a chroot, so the flash plugin will think that this is another tmp 
and and works happily. But this method is having many security and 
relaibilty issues,and also this setup higly affects the speed. Actually 
v were working on a 6 terminal environment, so the insteability 
increases as each user logged in. Is there some way to fix this?
regards
    vineesh

Re: multi-seat sound [again]: anybody actually doing it?

[Aivils S. <ai...@un...>]

> Hugo Vanwoerkom wrote:
> >--- ludovic pollet <pl...@nn...> wrote:
> >
> > =A0
> >
> >>Hello,
> >>
> >>For most alsa application, correctly setting the
> >>following environment
> >>variable will do the trick :
> >>
> >>ALSA_CARD=3D1
> >>ALSA_CTL_CARD=3D1
> >>ALSA_PCM_CARD=3D1
> >>
> >>You can force SDL games to use alsa with :
> >>
> >>SDL_AUDIODRIVER=3Dalsa
> >>
> >>
> >>But applications which use the OSS API will cause
> >>problems (mozilla plugins,
> >>openoffice, old games, ...)
> >>
> >>For those, you will need to make the device entries
> >>point to different files
> >>depending on the DISPLAY : I do that at home. Have a
> >>look at
> >>http://www.nnx.com/~pludov/sessiond/

SDL driver is one , which have hardcoded
/dev/sound/dsp
Please use Ludovic recomendations. Create a user login
script:
SDL_AUDIODRIVER=3D"oss"
AUDIODEVICE=3D"/dev/dsp"
export $SDL_AUDIODRIVER $AUDIODEVICE

I am not udev expert, but that /dev/sound is artifical,
created by udev config scripts - so is _not_ forced
to create /dev/sound at all. Edit udev scripts and You
have dspXX where You want. Under Mandriva edit
/etc/udev/rules.d/50-mdk.rules

=46or appliaction , which does suspicious things
# strace -oapp.log application-bin
Analyze app.log or simpler method
# strings application-bin | grep dsp
or
# strings lib-plugin.so | grep dsp

Aivils

Re: multi-seat sound [again]: anybody actually doing it?

[Helge H. <hel...@ai...>]

Hugo Vanwoerkom wrote:

>Hi,
>
>I just found out that my SB/Live 24 bit Audigy works
>good with kernel 2.6.15-ck1 (did not 6 months ago with
>2.6.12.11)
>
>So that opens up the possibility of 2 audio cards for
>2 simultaneous users.
>
>This means alsa however.
>
>Anybody run simultaneous alsa devices for different
>users?
>  
>
I have been using the same device for different users.
(The trident driver, with alsa and OSS emulation.)
This device is supposed to do hardware mixing, so
several processes/user may use the same sound device
at the same time. Provided, of course, that they are next
to each other.

This usually works fine, but in some cases one user gets
strange echoey or chopped-up sound.  A driver bug/limitation
I guess.

The card supports front and rear speakers, perhaps that can
be used to provide independent stereo without having to
use more cards.

Helge Hafting