Re: [Alsa-user] Re: Re: SB Live! PCM control

[James Courtier-Dutton <James@superbug.co.uk>]

Lee Revell wrote:
> On Thu, 2005-02-03 at 22:35 +0000, James Courtier-Dutton wrote:
> 
>>I think it is unwise to implement a Master volume control for the SBLive 
>>at this time. We had to remove it some time ago, and it can be 
>>implemented in a better way that in the DSP code.
>>
> 
> 
> James, can you please elaborate on this a bit?  If you have a better way
> then I don't want to waste time doing it in the DSP.
> 
> Lee
> 

This should instead be supported in the alsa-lib mixer abstraction 
layer, that unfortunately, has not been completed yet.
Then, the DSP would have 3 stereo controls for front, rear, center/lfe 
and the mixer lisp config would add a "virtual" Master control, that 
would present a single "Master" control to the user application, but 
alsa-lib would convert that to control messages to all 3 stereo controls.

I think your time would be better spent completing the mixer abstraction 
layer that other alsa developers have already started.

Another point, I personally did not remove the Master control, but it 
disappeared due to lack of SB Live DSP GPR registers.

James


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