Please ignore this: - [xine-devel] Mixer functions

[James Courtier-D. <Ja...@su...>]

Sorry, posted to wrong list.

James Courtier-Dutton wrote:
> Hi,
> 
> With 5.1 channel sound being used quite a lot now, I was wondering what 
> to do about volume controls.
> For example, I have: -
> Front speakers controlled by PCM and Master slider.
> Rear speakers controlled by Surround slider
> Center controlled by Center Slider
> LFE controlled by LFE slider.
> 
> I would assume that a "Master" slider would control all 6 channels at 
> the same time.
> So, in this setup, the Master slider is not actually acting as a Master, 
> but instead, only a Front speaker control.
> 
> I suggest that in these cases, "Master" gets renamed to something else, 
> and then alsa-lib takes over providing a "Master"
> alsa-lib could then also use config files, to define the mixer elements.
> We could then provide mixer elements that do proper "Master", 
> "Front/Rear Fader" etc.
> 
> I know you said earlier that you are in the process of developing a 
> better mixer, possibly having 0db points etc.
> Could you add these suggestions, so that they are possible as well.
> 
> Another problem I have come across, is that some sound cards have a 
> headphone amplifier on the front speaker output, and some sound cards 
> have a headphone amplifier on the rear/surround outputs.
> E.g. ALC650 has headphone on front output.
> AD1985 has headphone on surround (but is switchable to front).
> Does anyone know if the AC97 standard is headphones on front, or 
> headphones on rear/surround ?
> I was talking to a user who has sound coming out of a speaker output, 
> but not the headphone or center/lfe outputs, also the slider name 
> controlling the speaker output was "surround".
> It would be nice to find out from yourselves what the AC97 standard says 
> it should be, and I will then post a PATCH to get the AD1985 to act in 
> the same way as all other sound cards.
> 
> Cheers
> James
> 
>