Re: [Jack-Devel] Connecting alsa-loopback to jack

Jan Kohnert wrote:
> 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"
> }

(ignoring pcm.merge for the moment, it's not entirely obvious to me how
you plan on using that)

Looks like you're missing the connections between pcm.aduplex and jack that use
card 1.  You'll need something like:

pcm.cloop {
    type dsnoop
    ipc_key 219347
    slave.pcm "hw:Loopback,1,0"
}
pcm.ploop {
    type plug
    slave.pcm "hw:Loopback,1,1"
}

Then you can run "alsa_in -d cloop" and/or "alsa_out -d ploop" and
finally connect them up with jack_connect alsa_in:capture_1 system:playback_1
jack_connect alsa_in:capture_2 system:playback_2 or similar.

-- 
Jamie Heilman                     http://audible.transient.net/~jamie/

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