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

[Mikael Magnusson <mikaelmagnusson@glocalnet.net>]

Jaroslav Kysela wrote:
> On Tue, 22 Feb 2005, Lee Revell wrote:
> 
> 
>>There are two separate issues that the patch addresses.  One is that
>>unlike the Audigy configuration, the driver does not use separate FX
>>buses for front output and PCM.  So attenuating the front channels will
>>attenuate *all* PCM samples.  This has to be fixed in the driver.  And
>>it's essentially zero cost as the extra FX buses and GPRs are available.
> 
> 
> 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.

/Mikael


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