loading mixer control values from a different file when opening an device

loading mixer control values from a different file when opening an device

[Ziv Haziz]

Hi All,
i'm using asound.conf file to define several devices 
where each one is configuring 
my sound device differently
changing route, setting different volumes and etc)

i would have like to load setting 
from a different file only when accessing the a 
specific device - something like this:

pcm.MyDevice {
  type hooks
  slave.pcm {
    type hw
    device 0
  }


  <i would like to place here something which
 will "func load" from another file>

  hooks.0 {
    type ctl_elems
    hook_args [

      ]

}

so when someone will playback MyDevice it 
will call also hooks from the other file

but i can't make it work, tried to use the alsa.conf
as example - any example will be highly appreciated

Re: loading mixer control values from a different file when opening an device

[Clemens Ladisch]

Ziv Haziz wrote:
> i would have like to load setting
> from a different file only when accessing the a
> specific device - something like this:
>
> pcm.MyDevice {
>   type hooks
>   slave.pcm {
>     type hw
>     device 0
>   }
>
>   <i would like to place here something which
>  will "func load" from another file>
>
>   hooks.0 {
>     type ctl_elems
>     hook_args [
>
>       ]
>
> }

The "hooks" PCM plugin is something completely separate
from the global "@hooks" mechanism.

You can include configuration files directly:
http://www.alsa-project.org/alsa-doc/alsa-lib/conf.html#conf_include

What is the actual problem you're trying to solve?


Regards,
Clemens

Re: loading mixer control values from a different file when opening an device

[Clemens Ladisch]

Ziv Haziz wrote:
> I have tried the method described in the link (using <> for loading
> other files) but I got an error - maybe I did not construct the small
> configuration file correctly.

Maybe, maybe not.  My crystal ball broke yesterday, so I do not know
what exactly you tried.

> Is the <> method works like the c preprocessor #include  directive?

Yes.

I put this into my ~/.asoundrc:

	pcm.test {
	        type plug
	        slave {
	                pcm "hw:0"
	                channels 2
	        }
	        </home/cladisch/my-ttable.conf>
	}

and this into ~/my-ttable.conf:

	ttable [
	        [ 0 1 ]
	        [ 1 0 ]
	]

and it works.


Regards,
Clemens