Re: Revo 5.1

Re: Revo 5.1

[Takashi Iwai]

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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Re: Revo 5.1

[Trevor Feeney]

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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Re: Revo 5.1

[David Peroutka]

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).

I'd really like to try the 4-th substream because there is a good chance 
that it is used to drive the headphone output (I see no other chip on 
the board for headphone out).

Is there any other way to access the 4-th substream of PCM#2? Looking at 
ice1724.c I see no easy way to do that, so I'm again asking you for help :)

Thanks in advance,

David


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Re: Re: Revo 5.1

[Takashi Iwai]

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


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Re: Re: Revo 5.1

[Trevor Feeney]

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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Re: Re: Revo 5.1

[Takashi Iwai]

At Fri, 09 Dec 2005 09:20:51 -0500,
Trevor Feeney wrote:
> 
> 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?

The front is handled with the multi-channel DMA, corresponding to
snd_vt1724_playback_pro_*() callbacks.  This supports 2-8 interleaved
channels.  The other 3 DMAs are only for 2-channel streams,
snd_vt1724_playback_indep_*().  The 4th DMA (possibly a headphone
output) is, thus, the 3rd substream of this type.

There is no way to duplicate the signal for both front and another
stream _on hardware_, AFAIK.  It might work with some trick, though
(e.g. sharing the same ring buffer with different DMAs).

The possible solution is the addition in alsa-lib to duplicate signals
via multi+route plugins.

>   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.

The headphone output of laptops is usually the same to speaker or
line-out.


Takashi


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Re: Re: Revo 5.1

[Trevor Feeney]

Takashi Iwai wrote:

>At Fri, 09 Dec 2005 09:20:51 -0500,
>Trevor Feeney wrote:
>  
>
>>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?
>>    
>>
>
>The front is handled with the multi-channel DMA, corresponding to
>snd_vt1724_playback_pro_*() callbacks.  This supports 2-8 interleaved
>channels.  The other 3 DMAs are only for 2-channel streams,
>snd_vt1724_playback_indep_*().  The 4th DMA (possibly a headphone
>output) is, thus, the 3rd substream of this type.
>
>There is no way to duplicate the signal for both front and another
>stream _on hardware_, AFAIK.  It might work with some trick, though
>(e.g. sharing the same ring buffer with different DMAs).
>
>The possible solution is the addition in alsa-lib to duplicate signals
>via multi+route plugins.
>
>  
>
>>  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.
>>    
>>
>
>The headphone output of laptops is usually the same to speaker or
>line-out.
>
>
>Takashi
>  
>
Just to make sure I'm thinking properly...my assumption is that each PCM 
channel on the controller (in this case Envy24GT) has a DAC associated 
with it.  The driver also sets up the mixer controls for each of those 
DACs.  Now I'm also looking at your message and thinking that a DMA is 
associated with the DAC (as you'd have to write to the the DAC at the 
proper memory address to output).  I did some looking over of the AK 
4358 Datasheet to try and get a better grasp of what happens on that 
end.  Can't find a Datasheet for the Envy24GT, so I have to examine the 
driver to figure that out.  Where I get a bit confused is substreams.  
If you output to a substream, is that like outputting to a DMA/DAC, or 
to a PCM stream on the controller (or maybe I'm way off)? 

As I mentioned before,t he card does list 3 substreams, I can output to 
pluginhw:0,2,0 0,2,1 and 0,2,2. The first substream outputs to the 
rears, the second to the center/sub out and the third outputs nothing 
(there are no errors either).  If those substreams correpsonded directly 
with the pair of DACs, I would expect the third to work properly then.  
If they corresponded to a PCM stream through the controller, then I 
would epxect it to go nowhere.

I know I may be off a bit on some of that.  Please corect me, as I would 
like to try and learn this and be able to help out.  As I said, I've 
read through the driver development guide, but it's not geared well to 
newbies I find. 

That's all for now.

Trevor


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Re: Re: Revo 5.1

[Takashi Iwai]

At Fri, 09 Dec 2005 10:31:34 -0500,
Trevor Feeney wrote:
> 
> Takashi Iwai wrote:
> 
> >At Fri, 09 Dec 2005 09:20:51 -0500,
> >Trevor Feeney wrote:
> >  
> >
> >>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?
> >>    
> >>
> >
> >The front is handled with the multi-channel DMA, corresponding to
> >snd_vt1724_playback_pro_*() callbacks.  This supports 2-8 interleaved
> >channels.  The other 3 DMAs are only for 2-channel streams,
> >snd_vt1724_playback_indep_*().  The 4th DMA (possibly a headphone
> >output) is, thus, the 3rd substream of this type.
> >
> >There is no way to duplicate the signal for both front and another
> >stream _on hardware_, AFAIK.  It might work with some trick, though
> >(e.g. sharing the same ring buffer with different DMAs).
> >
> >The possible solution is the addition in alsa-lib to duplicate signals
> >via multi+route plugins.
> >
> >  
> >
> >>  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.
> >>    
> >>
> >
> >The headphone output of laptops is usually the same to speaker or
> >line-out.
> >
> >
> >Takashi
> >  
> >
> Just to make sure I'm thinking properly...my assumption is that each PCM 
> channel on the controller (in this case Envy24GT) has a DAC associated 
> with it.  The driver also sets up the mixer controls for each of those 
> DACs.  Now I'm also looking at your message and thinking that a DMA is 
> associated with the DAC (as you'd have to write to the the DAC at the 
> proper memory address to output).

At least, envy24HT has 4 DMAs.  The first one is for multi-channels.
It can send from 2 to 8 channels as a single stream.
The rest 3 DMAs are for 2-channels only, rear, clfe and side.  You
can control them separately unless the channels conflict with the
mutli-channel setup of the first DMA.

>  I did some looking over of the AK 
> 4358 Datasheet to try and get a better grasp of what happens on that 
> end.  Can't find a Datasheet for the Envy24GT, so I have to examine the 
> driver to figure that out.  Where I get a bit confused is substreams.  
> If you output to a substream, is that like outputting to a DMA/DAC, or 
> to a PCM stream on the controller (or maybe I'm way off)? 

I have no datasheet for GT, too.  Only the datasheet for Envy24HT is
available (you can find it on alsa's ftp).

> As I mentioned before,t he card does list 3 substreams, I can output to 
> pluginhw:0,2,0 0,2,1 and 0,2,2. The first substream outputs to the 
> rears, the second to the center/sub out and the third outputs nothing 
> (there are no errors either).  If those substreams correpsonded directly 
> with the pair of DACs, I would expect the third to work properly then.  
> If they corresponded to a PCM stream through the controller, then I 
> would epxect it to go nowhere.

Hmm, interesting.  Although GT seems supporting only 6 channels, the
DMA looks as if working.  Possibly 6-channel is just for the
multi-channel DMA?


Takashi


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Re: Re: Revo 5.1

[Trevor Feeney]

Takashi Iwai wrote:

>At Fri, 09 Dec 2005 10:31:34 -0500,
>Trevor Feeney wrote:
>  
>
>>Takashi Iwai wrote:
>>
>>    
>>
>>>At Fri, 09 Dec 2005 09:20:51 -0500,
>>>Trevor Feeney wrote:
>>> 
>>>
>>>      
>>>
>>>>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?
>>>>   
>>>>
>>>>        
>>>>
>>>The front is handled with the multi-channel DMA, corresponding to
>>>snd_vt1724_playback_pro_*() callbacks.  This supports 2-8 interleaved
>>>channels.  The other 3 DMAs are only for 2-channel streams,
>>>snd_vt1724_playback_indep_*().  The 4th DMA (possibly a headphone
>>>output) is, thus, the 3rd substream of this type.
>>>
>>>There is no way to duplicate the signal for both front and another
>>>stream _on hardware_, AFAIK.  It might work with some trick, though
>>>(e.g. sharing the same ring buffer with different DMAs).
>>>
>>>The possible solution is the addition in alsa-lib to duplicate signals
>>>via multi+route plugins.
>>>
>>> 
>>>
>>>      
>>>
>>>> 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.
>>>>   
>>>>
>>>>        
>>>>
>>>The headphone output of laptops is usually the same to speaker or
>>>line-out.
>>>
>>>
>>>Takashi
>>> 
>>>
>>>      
>>>
>>Just to make sure I'm thinking properly...my assumption is that each PCM 
>>channel on the controller (in this case Envy24GT) has a DAC associated 
>>with it.  The driver also sets up the mixer controls for each of those 
>>DACs.  Now I'm also looking at your message and thinking that a DMA is 
>>associated with the DAC (as you'd have to write to the the DAC at the 
>>proper memory address to output).
>>    
>>
>
>At least, envy24HT has 4 DMAs.  The first one is for multi-channels.
>It can send from 2 to 8 channels as a single stream.
>The rest 3 DMAs are for 2-channels only, rear, clfe and side.  You
>can control them separately unless the channels conflict with the
>mutli-channel setup of the first DMA.
>
>  
>
>> I did some looking over of the AK 
>>4358 Datasheet to try and get a better grasp of what happens on that 
>>end.  Can't find a Datasheet for the Envy24GT, so I have to examine the 
>>driver to figure that out.  Where I get a bit confused is substreams.  
>>If you output to a substream, is that like outputting to a DMA/DAC, or 
>>to a PCM stream on the controller (or maybe I'm way off)? 
>>    
>>
>
>I have no datasheet for GT, too.  Only the datasheet for Envy24HT is
>available (you can find it on alsa's ftp).
>
>  
>
>>As I mentioned before,t he card does list 3 substreams, I can output to 
>>pluginhw:0,2,0 0,2,1 and 0,2,2. The first substream outputs to the 
>>rears, the second to the center/sub out and the third outputs nothing 
>>(there are no errors either).  If those substreams correpsonded directly 
>>with the pair of DACs, I would expect the third to work properly then.  
>>If they corresponded to a PCM stream through the controller, then I 
>>would epxect it to go nowhere.
>>    
>>
>
>Hmm, interesting.  Although GT seems supporting only 6 channels, the
>DMA looks as if working.  Possibly 6-channel is just for the
>multi-channel DMA?
>
>
>Takashi
>  
>
I'll take a look at the HT datasheet so I can get a better grasp how 
things work.  The GT specs on VIA's site say that it's a 6 channel 
controller.  Is there a way that one could acquire the datasheet?  I 
figure the HT can't be too far off the GT, as the card is function using 
the HT specs.   If it is 6 channels for the multi-channel portion, can 
you think of any reason there would still be no output to the last 
substream (which I'm assuming is the headphone stream)?


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