Re: List of control parameters needed

[Paul Davis <paul@linuxaudiosystems.com>]

>> 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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