Re: [Alsa-user] Mixer controls added by application

2016-12-12 Thread peterten01 
Hi, 

thanks for the links. I will try. 
BTW: Where can I find source files of softvol and other plugins? 

Best regards 
Peter

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Re: [Alsa-user] Mixer controls added by application

2016-12-12 Thread Takashi Sakamoto 
Hi,

On Dec 12 2016 16:14, peterte...@yahoo.com wrote:
> I'd like to provide mixer controls such as 'Master Playback Volume' for a 
> sound card
> where the driver does not natively support these controls.
> Is it possible to write an application to add mixer controls for a given 
> sound card?
> I am thinking about using the alsa-lib or providing an alsa-plugin (not 
> softvol).

You can achieve it by using some APIs in alsa-lib. Source of the library 
includes a sample program for this purpose. I wish it helps your work.
http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=test/user-ctl-element-set.c;h=75083d219fe6725870ad73ccf8aa758eb66e6d7d;hb=HEAD

For a design of ALSA control interface, code document will help you.
http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/control/control.c;h=134ba4c8ebea40dc088a4d94db7f8119703e4cc1;hb=HEAD#l31

I note that Linux kernel 4.0 or former includes some bugs for this feature.


Regards

Takashi Sakamoto

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[Alsa-user] Mixer controls added by application

2016-12-11 Thread peterten01 
Hi, 

I'd like to provide mixer controls such as 'Master Playback Volume' for a sound 
card where the driver does not natively support these controls. 
Is it possible to write an application to add mixer controls for a given sound 
card? 
I am thinking about using the alsa-lib or providing an alsa-plugin (not 
softvol). 

Thanks in advance. 
Peter

--
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With one year of Intel Parallel Studio XE.
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