Re: [alsa-devel] How to apply rate conversion in asound.conf

12 Nov 2013

      ...
From: cmst@live.com
To: alsa-devel@alsa-project.org
Date: Fri, 8 Nov 2013 14:15:30 +0000
Subject: Re: [alsa-devel] How to apply rate conversion in asound.conf
...
Date: Wed, 6 Nov 2013 17:30:25 +0100
From: clemens@ladisch.de
To: cmst@live.com; alsa-devel@alsa-project.org
Subject: Re: [alsa-devel] How to apply rate conversion in asound.conf
Dolevo Jay wrote:
...
pcm.!default {
   type plug
   slave.pcm multi
}
pcm.multi {
        slaves.a.pcm "hw:0,1";
        slaves.b.pcm "hw:1,1";
...
My purpose is to apply rate conversion to the "hw:1,1" and have 44100 rate
out.
All slaves must use the same rate.
The easiest way is apply this to the plug plugin:
pcm.!default {
   type plug
   slave {
   	pcm multi
   	rate 44100
   }
}
Regards,
Clemens
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Hi,
What you suggested worked perfect but I implemented the rate conversion in my software for some specific reasons.
What I need to do now is to have a aosund.conf which has dmix into multi plugins together. 
So, here is my multi configuration:

pcm.!default {
   type plug
   slave.pcm multi
}
pcm.multi {
        type multi;
        slaves.a.pcm "hw:0,1";
        slaves.a.channels 2;
        slaves.b.pcm "hw:1,1";
        slaves.b.channels 2;
    bindings.0.slave a;
    bindings.0.channel 0;
    bindings.1.slave a;
    bindings.1.channel 1;
    bindings.2.slave b;
    bindings.2.channel 0;
    bindings.3.slave b;
    bindings.3.channel 1;

}

The following dmix runs ok for 1,1 hardware:
pcm.dmixer {
    type dmix
    ipc_key 2048
    slave {
        pcm "hw:1,1"
    }
    bindings {
        0 0
        1 1
    }
}
pcm.!default {
    type plug
    slave.pcm dmixer
}

Could you please tell me how I can implement the second configuration with dmixer into the first one which has multi. 
So, basically how can I call a plugin inside of another plugin?
Thanks a lot.

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Hello,
I'd appreciate if someone could tell me even this is possible or not?
Thanks.