Re: Problem with multiopen on SB Audigy 2

[Takashi Iwai <tiwai@suse.de>]

At Wed, 8 Oct 2003 16:44:02 +0200 (CEST),
Jaroslav wrote:
> 
> On Wed, 8 Oct 2003, Takashi Iwai wrote:
> 
> > > I'm still not sure, if we should handle these things in the driver.
> > > Hardware is not designed in this way and we should describe hardware
> > > in the driver as most accurate as we can.
> >
> > IMO, the master volume is a feature we mostly need.
> > in the case of emu10k1, it's much easier to implement this on the
> > driver (as a digital attenuator) rather than implementing it outside
> > the kernel space (except for the lack of GPR space).
> 
> Ok, but add more channels to "Master" so we have still a chance to control
> values independently.

now i'm thinking of a hierarchy like

	master (mono?)
	
	front(l/r)  rear(l/r) center/lfe ...
	
	outputs...

the advantage is that you can adjust all volumes with a single
control.  adjusting the level for each channel is done by the volumes
below it.  there is still a problem that the sensitivity is different
between front and surround volumes (the former is ac97 and the latter
is the digital attenuation).  perhaps it's solved when we introduce dB
hints.

or, yes, instead of the top master, we merge all the lower layers as
the master volume (either multi-channels or "master front", "master
rear", etc.)

perhaps we should create some templates of basic mixer designs suited
to different hardware implementations.  the confusion we're facing now
seems to come from the different implementation even though the same
control name is used.


Takashi


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