Enumerating virtual devices

Enumerating virtual devices

[Gregor Mückl]

Hello!

Is there a way to enumerate devices like "surround40", "front", "side", etc. 
and other user-created virtual devices? I can't seem to find any function for 
that in the documentation. Any hint would be appreciated.

Regards,
Gregor


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Re: Enumerating virtual devices

[Lee Revell]

On Fri, 2005-01-28 at 02:09 +0100, Gregor Mückl wrote:
> Hello!
> 
> Is there a way to enumerate devices like "surround40", "front", "side", etc. 
> and other user-created virtual devices? I can't seem to find any function for 
> that in the documentation. Any hint would be appreciated.
> 

That's a very very good question.  As you may know this came up on the
JACK list recently.

I suspect there is no good API for this, because aplay -L essentially
does "get config | grep pcm".

Lee



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Re: Enumerating virtual devices

[Takashi Iwai]

At Fri, 28 Jan 2005 14:29:30 -0500,
Lee Revell wrote:
> 
> On Fri, 2005-01-28 at 02:09 +0100, Gregor Mückl wrote:
> > Hello!
> > 
> > Is there a way to enumerate devices like "surround40", "front", "side", etc. 
> > and other user-created virtual devices? I can't seem to find any function for 
> > that in the documentation. Any hint would be appreciated.
> > 
> 
> That's a very very good question.  As you may know this came up on the
> JACK list recently.
> 
> I suspect there is no good API for this, because aplay -L essentially
> does "get config | grep pcm".

Right, no API yet.

I have a plan to create a new API to list up the available PCMs, but
not implemented yet.


Takashi


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Re: Enumerating virtual devices

[Manuel Jander]

Hello,

On Mon, 2005-01-31 at 12:56 +0100, Takashi Iwai wrote:
> At Fri, 28 Jan 2005 14:29:30 -0500,
> Lee Revell wrote:
> > On Fri, 2005-01-28 at 02:09 +0100, Gregor Mückl wrote:
> > > Hello!
> > > Is there a way to enumerate devices like "surround40", "front", "side", etc. 
> > > and other user-created virtual devices? I can't seem to find any function for 
> > > that in the documentation. Any hint would be appreciated.
[snip!]
> Right, no API yet.
> 
> I have a plan to create a new API to list up the available PCMs, but
> not implemented yet.

IMHO enumeration should not be done just for soundcards, but rather for
"devices" and channels. I was proposing something like that in the scope
of a Resource Manager and Configuration system for ALSA. Unfortunately i
could not go any further beyond some general ideas, because of current
very bad employment conditions :( (no time...).
I posted my thoughts on the ALSA wiki, if someone may be interested:
http://alsa.opensrc.org/index.php?page=DrawingBoard

-- 
Manuel Jander
Electronic Engineer



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