[Jack-Devel] Connecting alsa-loopback to jack

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DateTue, 17 Jul 2012 21:09:21 +0200
From Jan Kohnert <[hidden] at jankoh dot dyndns dot org>
To[hidden] at lists dot jackaudio dot org
Follow-UpJamie Heilman Re: [Jack-Devel] Connecting alsa-loopback to jack
Follow-UpaCOSwt Re: [Jack-Devel] Connecting alsa-loopback to jack
Hi,

since http://alsa.opensrc.org/Jack_and_Loopback_device_as_Alsa-to-Jack_bridge 
seemsdead and gone, I'm asking here, as I believe there are quite a lot of 
experts reading the list.

After I finally got jack workingusing jack1 I want to connect the alsa 
loopback device with my recording/playback interface to be able to use both 
devices with jack.

Jack is just working fine. But trying to playback with the loop device gives 
no sound.

I'm sure, this is just aconfiguration problem, but I'm not able to figure out 
the correct config.

This is what I got so far:

jankoh@kohni ~ $ cat .asoundrc
# playback PCM device: using loopback subdevice 0,0
pcm.amix {
        type dmix
        ipc_key 219345
        slave.pcm "hw:Loopback,0,0"
}

# capture PCM device: using loopback subdevice 0,1
pcm.asnoop {
        type dsnoop
        ipc_key 219346
        slave.pcm "hw:Loopback,0,1"
}

# duplex device combining above PCM devices
pcm.aduplex {
        type asym
        playback.pcm "amix"
        capture.pcm "asnoop"
}

pcm.merge {
    type multi;
    slaves.a.pcm hw:Blackjack
    slaves.a.channels 2;
    slaves.b.pcm hw:Loopback
    slaves.b.channels 2;
    bindings.0.slave a;
    bindings.0.channel 0;
    bindings.1.slave b;
    bindings.1.channel 0;
    bindings.2.slave a;
    bindings.2.channel 1;
    bindings.3.slave b;
    bindings.3.channel 1;
}

ctl.merge {
    type hw
    card 2
}
jankoh@kohni ~ $ cat /proc/asound/cards 
 0 [SB             ]: HDA-Intel - HDA ATI SB
                      HDA ATI SB at 0xfdff4000 irq 16
 1 [NVidia         ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0xfbffc000 irq 19
 2 [Blackjack      ]: USB-Audio - Onyx Blackjack
                      Loud Technologies Inc. Onyx Blackjack at 
usb-0000:00:13.0-5, full speed
 3 [Loopback       ]: Loopback - Loopback
                      Loopback 1
jankoh@kohni ~ $ 

Can you point me to related documentation or give me a hint, where the error 
could be?

Thanks!

-- 
MfG Jan
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