Re: building a mixer

[Takashi Iwai <tiwai@suse.de>]

At Tue, 28 Jan 2003 00:45:55 +0100,
Pieter Palmers wrote:
> 
> Hi all,
> 
> is it possible to support multiple mixers in one card?

no, on ALSA 0.9.0, there is only one control interface per card.

> I have the following situation:
> The card consists of a Maestro2E PCI controller with AC97 codec. On the 
> expansion port of the maestro is a SAM9707 device. I'd like separate 
> mixers for the AC97 and the SAM, because the control names can be very 
> confusing otherwise (i.e. Master volume of Codec does not change Master 
> volume of any SAM output).

it's possible to give the index value to the control element, so  that
the elements with the same name can coexist.

it's also possible to extend the existing API, of course, but i don't
think it's the best solution.
what we really need is a card-specific mixer application.  then you
can arrange the appearance more reasonably. 

i think either an external database giving the mixer topology or a
script-based mixer GUI which runs different scripts for each card will
be necessary.


Takashi


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