Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Takashi Iwai <tiwai@suse.de>]

At Wed, 23 Feb 2005 10:00:49 +0100 (CET),
Jaroslav wrote:
> 
> On Wed, 23 Feb 2005, Mikael Magnusson wrote:
> 
> > > Sorry, but I don't understand very well why we need to have "PCM mix" FX
> > > buses. We can do this "down-mix" in the DSP code, but it's better to do it
> > > in application. My original DSP code for emu10k1 have only front, rear,
> > > center+lfe FX buses (6). I must miss something important here.
> > > 
> > 
> > I don't understand what you mean with "PCM mix". Are you thinking of the 
> > default output which are up-mixed to 5.1? The patch doesn't down-mix 5.1 
> > to front or something like that. It adds two fx inputs that are routed 
> > to front only and not up-mixed to 5.1. This is how the Audigy driver 
> > works. It also can make the configuration file a little cleaner, since 
> > it doesn't have to mute the up-mixed outputs.
> 
> I see now. My behaviour was to "duplicate" front to surround with "Wave 
> Surround" controls and you propose to have FX buses which will route 
> signal to both front & rear and separate FX buses to route signal to 
> front only.
> 
> I don't see the real benefit. Both cases are correct and the alsa-lib
> configuration won't be much different. Anyway, if you feel that it's
> better, then go ahead...

IIRC, the problem was stated in the case that both front and
multi-channel streams are output at the same time.

I think this patch is fine (although not tested yet).  At least, it
will decrease the difference between Live and Audigy.


Takashi


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