Re: Re: Revo 5.1

[Trevor Feeney <trev@feens.org>]

Takashi Iwai wrote:

>At Thu, 08 Dec 2005 21:42:48 +0100,
>David Peroutka wrote:
>  
>
>>Takashi Iwai wrote:
>>    
>>
>>>At Tue, 06 Dec 2005 09:34:48 -0500,
>>>Trevor Feeney wrote:
>>>
>>>      
>>>
>>>>Was taking a look at the source for the Revo 5.1, noticed a few things.  
>>>>You set it up as using only 6 DACs, going by the 5.1 I figure, but when 
>>>>you consider that it also has the headpone out, it would have the same 
>>>>number of DACs as the 7.1 (8 DACs in all). 
>>>>
>>>>Takashi - that answers your question in the last thread...from what I've 
>>>>read, the 5.1 only uses one codec, and the headphones would just be a 
>>>>separate channel.  I tried adjusting the number of DACs to 8 in the 
>>>>driver, and did manage to get two
>>>>DAC mixer sliders.  I'm not really sure if that was the way to go or 
>>>>not.  I tried adjusting the asound plugin to output to 8 channels, pcm 
>>>>device surround71, but that didn't seem to work.  I wondering if it 
>>>>needs to be setup separately thant the other 6 channels so that it would 
>>>>be considered it's own PCM device.  That goes a bit beyond my realm of 
>>>>knowledge for driver development though...still trying to learn this.  
>>>>Been reading a lot of the documents and such.
>>>>        
>>>>
>>>[Added alsa-devel ML again]
>>>
>>>In the case of ice1724, you can open a stereo stream separately.
>>>The first PCM is assigned to the multi-channel, i.e. 2-8 channels
>>>interleaved format.  The secondary PCM is for SPDIF.  The third PCM is
>>>the "independent" streams.  This may have up to 3 substreams, each of
>>>which is a 2-channel one.  If you change num_dacs = 8, you'll be able
>>>to access plughw:0,2,3 (suppose the card# is 0) for the last two
>>>channels individually:
>>>
>>>	% aplay -Dplughw:0,1,3 foo.wav
>>>
>>>And you have to raise the corresponding DAC mixer values, of course.
>>>
>>>
>>>Takashi
>>>      
>>>
>>I've enabled all 8-channels of AK4358 in the driver, but I was unable to 
>>access the 4-th substream, because (as you noted) there are max 3 
>>substreams per PCM, so "plughw:0,2,3" is actually not available (the 
>>other substreams work fine).
>>    
>>
>
>My bad, I mean 'plughw:0,2,2'.
>
>But Trevor reported it doesn't work, too, and mentioned that the chip
>itself (Envy24GT) shouldn't support 4th stream...
>
>
>Takashi
>  
>
Takashi,

I've been poking around in the source for the driver and have a few 
questions.  Where is it in the code that the front PCM stream would 
conncect to output to the DACs associated with that, and is there a way 
to duplicate that to the extra 2 DACs?  I know that laptop cards tend to 
have a similar setup, outputting to headphones and speakers, so I figure 
it can be done.  I'm also thinking that's the most logical solution in 
this case as well.

I have no problem fooling around to figure things out (I went to school 
for software engineering, just have never dealt with drivers before), I 
just need to be pointed in the right direction.  I know there are a few 
people now looking for support with this card, so I figure if we work 
together we can get it all working.

Thanks again,

Trevor


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