Re: Surround sound and volume control question

[Daniel Jacobowitz <drow@false.org>]

On Mon, Oct 09, 2006 at 04:50:49PM +0200, Takashi Iwai wrote:
> > Is a ganged master control fundamentally incompatible with individual
> > channel volumes?  If so, doesn't it mean that this problem can never be
> > solved by an abstract mixer layer?
> 
> It's possible to create a virtual volume element that represents the
> base attenuation level.  Suppose "Master" to be a virtual volume (a
> mono), then the real volume values for front, rear and CLFE become
> "front + master", "rear + master" and "CLFE + master".  The values
> have to be clipped to max 31 (or 63).
> 
> The problem is that the mixer values are no longer corresponding to
> the register values as 1:1.  Thus the current code for get/put
> callbacks can't be used as it is.  The values have to be cached and
> handled internally independent from the register values...

Do you think this is a better choice than using softvol?  If so, I
will work on the implementation later this week.

-- 
Daniel Jacobowitz
CodeSourcery

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