Re: Revo 5.1

[Trevor Feeney <trev@feens.org>]

Takashi Iwai <tiwai <at> suse.de> writes:

> 
> 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
> 
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I tried the aplay without succes...oh, and I was assuming that it should be 
plughw:0,2,1, plughw:0,2,2, and plughw:0,2,3.  

However, I was doing some looking into the chips used on the card and had a 
thought.  The 5.1 uses the envy24gt as opposed to the envy24ht.  The big 
difference is that the gt is that it is a 6 channel card.  However, with the 
headphones included, there are 8 output channels/DACS in total.  So I would 
guess that basing the card off the ht, setting it up with 8 DACs would not 
work.  Though I'm still figuring this out, I'm guessing that means that one 
output (pcm)_channel actually has to drive 2 DACs.  I'm not quite sure where 
to go with that though.

Any help, suggestions, etc would be welcomed.

Trevor



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