List of control parameters needed

List of control parameters needed

[Pavana Sharma]

Hello,

I  am trying to export the controls to user space. I want to know the
complete list of controls
which ALSA expects the codec to support. For example, few are as below,

Master Playback Volume
Master Playback Switch
Tone Control - Bass
Tone Control - Treble
Line Capture Volume
Mic Capture Volume
Mic Sensitivity
Mic Auto Volume
Mic Auto Switch

Where can I get the complete list of controls which an audio codec has to
support.

Thanks & Regards
Pavana S



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Re: List of control parameters needed

[p z oooo]

Hi,

Try to look at alsa-driver/alsa-kernel/Documentation/ControlNames.txt
But warning, this is not complete list, rather recomendation. Most 
control names folows this recomendation, but there are some controls 
for some soundcards, that have diffrent names.

Peter Zubaj



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Re: List of control parameters needed

[Giuliano Pochini]

On Mon, 22 Mar 2004, Pavana Sharma wrote:

> Hello,
>
> I  am trying to export the controls to user space. I want to know the
> complete list of controls
> [...]
> Where can I get the complete list of controls which an audio codec has
> to support.

There is not such a list because they depend on the hardware. But there
is a list of common names that all drivers should respect.
The list is: /alsa-kernel/Documentation/ControlNames.txt


--
Giuliano.


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Re: List of control parameters needed

[James Courtier-Dutton]

Pavana Sharma wrote:
> Hello,
> 
> I  am trying to export the controls to user space. I want to know the
> complete list of controls
> which ALSA expects the codec to support. For example, few are as below,
> 
> Master Playback Volume
> Master Playback Switch
> Tone Control - Bass
> Tone Control - Treble
> Line Capture Volume
> Mic Capture Volume
> Mic Sensitivity
> Mic Auto Volume
> Mic Auto Switch
> 
> Where can I get the complete list of controls which an audio codec has to
> support.
> 
> Thanks & Regards
> Pavana S
> 
> 
The envy24/ice1712 cards do not have a Master or PCM control.



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Re: List of control parameters needed

[Paul Davis]

>> Where can I get the complete list of controls which an audio codec has to
>> support.

there is no such list.

and lets get the terminology straightened out here before this goes
any further.

"codec" comes (in this context) from "coder/decoder". that maps
roughly to what is more properly referred to as an analog-to-digital
or digital-to-analog converter (or both). these days, it could also
include devices that convert from one digital format (e.g. ADAT
LightPipe) to another (e.g. S/PDIF or T/DIF). 

thus, the list you offered actually to do with audio codecs, but is in
fact a description of the types of controls you might find on a
*mixer*.

however, given that there are cards without a mixer at all, plus cards
with radically different mixer designs, plus cards with extremely
simple mixers plus cards with extremely complex designs, there cannot
be a list of controls that any mixer will support. Even the idea of a
microphone input is h/w specific, as is the idea of a master volume
control. 

the best you could probably hope for is to first see if the mixer you
have has support for a "standard mixer API", then use that API. but no
such API exists at this time, and you would still have to have a
fallback position if you are using h/w that has no mixer or a mixer
than cannot support a "standard mixer API".

--p


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