[nas] [PATCH] consistent gain setting in voxware server

[Erik Auerswald]

Hi,

On Wed, Jul 19, 2006 at 11:08:11PM -0600, Jon Trulson wrote:
> On Thu, 20 Jul 2006, Erik Auerswald wrote:
> >- On my system the wrong mixer parts are affected, i.e. the value of
> > patching the line or mic input to output, but not the value used for
> > recording (called 'IGain' by aumix). Selecting the input in aupanel
> > (or audemo or ...) works insofar as the line resp. mic level is
> > controlled, but the recording input selection is not done.
> 
>         I guess I'm not sure I follow... I haven't played with
>         recording in NAS since I first tried NAS out so many years ago
>         :)
> 
>         Looking at setPhysicalInputGainAndLineMode(), it does appear
>         we try to set the hw gains. What also interesting is that line
>         and mic are mutually exclusive with respect to their gain
>         settings.

These gain settings work on the wrong mixer parts for my hardware.

>         Maybe if you explain the problem in more detail?  I am also
>         using OSS emulation with ALSA, but again, have not tried
>         recording in some time, so I am not sure I understand the
>         problem...

There are 4 mixer settings connected to the inputs of my sound hardware:

Line              output volume of line input (not used for recording)
Mic               output volume of microphone input (not used for recording)
IGain             input volume of selected recording input
record selection  to choose between line and mic input for recording

The NAS voxware server changes Line and Mic and sets one of them to 0 to
select the input channel. But this does not affect the recording
settings of my sound hardware.

On my hardware a special record selection has to be used and the IGain
value modified. This is not done by the NAS voxware server.

I am looking for some configurable way to add IGain/recording input
selection to the server without breaking the old way for systems where
it works right now. And I don't yet know how to actually set the IGain
value and how to select the recording source.

Erik