Jacob Meuser wrote:

> On Thu, Apr 09, 2009 at 12:07:37PM +0200, Dirk Mast wrote:
>> > there are now at most 2 choices.  analog or digital.  and yes, there
>> > are some codecs that only do analog and some that only to digital.
>> 
>> Yeah, that makes it more complicated.
>> 
>> Is the following if-construction too vague?
>> 
>> if (dacs.ngroups = 1) {
>>         -- create the normal inputs.usingdac as it's done now
>>         -- we don't care if it's analog or digital
> 
> actually in this case we don't create any knob, since it wouldn't
> do anything.


This one should have been obvious ;)
> 
>> elsif (dacs.ngroups = 2) {
>>         -- create a knob outputs.spdif (or something similar)
>>         -- problem is how to wire it:
>>         -- clean choice would of course to check the i/o pins
>>         -- maybe some other rules would apply?
>> 
>>         -- like first dac is always analog and second one digital?
>>         -- or maybe the longer dac group is analog and the shorter
>>         digital? -- I doubt there are azalia devices with more digital
>>         sections -- than analog sections
>> }
>>         
>> 
>> Personally I think reading the i/o pins would be much safer,
>> but if it's really the case that those upper assumptions are
>> always right, perhaps that would be another solution.
> 
> I haven't yet seen multiple digital output transmitters in a single
> codec.  but that doesn't mean there aren't/won't be such codecs, though.

Ok.
 
>> (Otherwise this could bring big problems if there would be a
>> non-"standard" azalia device sometimes...)
> 
> heh.  they all follow the standard, which allows many things.
> 
> probably the best would be something more like:
> 
> $ mixerctl -v outputs.mode
> outputs.mode=analog  [ analog digital ]
>

I _really_ like this one.

> the problem with checking i/o pins and/or using 'spdif' is that there
> may be both hdmi and s/pdif connections.  this control only affects
> which "dac group" is currently being used.  it really has nothing to
> do with the i/o pins.
> 

I didn't know azalia also comes with hdmi.

Since I can't help with any code, I'd be glad to test any patches.

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