Fwd: Audio codec channels as separate devices

[Burak METİN <metinburak@xxxxxxxxx>]

---------- Forwarded message ----------
From: Burak METİN <metinburak@xxxxxxxxx>
Date: Tue, Jul 1, 2014 at 1:55 PM
Subject: Re: Audio codec channels as separate devices
To: "Krause, Mathias" <Mathias.Krause@xxxxxx>

i made the right and left channels as separate devices but i also want to add the input channel to these devices. In alsa standard, #0 - front left, #1 - front right, #2 - rear left, #3 - rear right, #4 - center, and #5 - LFE (subwoofer)

What is the identity of microphone (or) line in channel ?

On Tue, Jul 1, 2014 at 10:31 AM, Krause, Mathias <Mathias.Krause@xxxxxx> wrote:

Hello,

 

please try using something like that.  (un-tested). Playing to dev1 and dev2 should then create mono streams with are send to one of the dmixer channel.

 

Check http://www.alsa-project.org/main/index.php/Asoundrc to see what is going on.

 

Regards,

Mathias

 

 

pcm.dev1 {

        type plug

        slave.pcm "dmixer"

        slave.channels 1

        ttable.0.0 0.5

        ttable.1.0 0.5

}

pcm.dev2 {

        type plug

        slave.pcm "dmixer"

        ttable.0.1 0.5

        Ttable.1.1 0.5

}

pcm.dmixer  {

        type dmix

        ipc_key 1024

        slave {

               pcm "hw:1,0"

               period_time 0

               period_size 1024

               buffer_size 4096

               rate 44100

        }

        bindings {

               0 0

               1 1

        }

}

 

 

From: Burak METİN [mailto:metinburak@xxxxxxxxx]
Sent: Monday, June 30, 2014 7:14 PM
To: Krause, Mathias
Cc: alsa-user@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: Audio codec channels as separate devices

 

Hello,

 

I have changed the /etc/asound.conf as below but nothing changed in alsamixer and aplay -l

 

pcm.!iteration {

     type plug

     slave.pcm "dmixer"

}

pcm.dmixer  {

     type dmix

     ipc_key 1024

     slave {

            pcm "hw:1,0"

            period_time 0

            period_size 1024

            buffer_size 4096

            rate 44100

     }

     bindings {

            0 0

            1 1

     }

}

ctl.dmixer {

     type hw

     card 0

}

 

On Mon, Jun 30, 2014 at 4:58 PM, Krause, Mathias <Mathias.Krause@xxxxxx> wrote:

Hello,

 

yes, check a combination of "dmix" and "route" (or plug) to do that:

http://www.alsa-project.org/main/index.php/Asoundrc

 

-

Mathias

 

 

 

Hello, I want to use the channels of the usb audio codec with independent sounds. Is it possible to make these channels separate devices by using alsa plugins?

 

 

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