Re: Re: [ALSA - lib 0000154]: Master volume only controls front output (emu10k1)

[Takashi Iwai <tiwai@suse.de>]

At Fri, 27 May 2005 16:43:18 +0200 (CEST),
Giuliano Pochini wrote:
> 
> On Fri, 27 May 2005, Jaroslav Kysela wrote:
> 
> > > > Hey developers, what's up with the abstract mixer layer? :-)
> > > >
> > >
> > > Anyone?
> >
> > I am working on it, but also doing zillions of other things. The actual
> > status is that the virtual mixer can be created inside the lisp
> > interpreter. I am looking for a clever code design to map the hardware
> > controls with minimal lisp code to abstract ones.... I need something like
> > an object model inside lisp (object == mixer element).
> 
> I was thinking about it, too. I'm not sure the lisp thing is the right
> way. If we want it to be generic enough we have to make a quite big part
> of the API available to the lisp interpreter. It would make the interface
> quite difficult to use and lisp doesn't make things simpler.
> I wonder if, maybe, it is simpler to write a loadable plugin interface and
> write the plugins in C as usual. A plugin is fast (no need to be
> interpreted), it's about as complex as a lisp program (same API) and it
> can be added without recompiling libasound (just like a lisp script) and
> no need to learn lisp :)

Ah, that's what I thought of, too.  In most cases, what we need are:

- create a new user-defined control
- bind several controls to a single one
- convert/correct the different volume ranges

and they can be implemented relatively easily.  We have already the
config-tree parser code, so if the static configuration suffices, the
plugin would work enough.

The only problem of alsa-lib plugin is, again, the OSS emulation in
kernel...


Takashi


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