Re: [Jack-Devel] Alsa Jack Plugin

On Sat, June 30, 2012 12:56 pm, James Warden wrote:
> Hi,
>
> Just a guess, as I have not been dealing with these things for ages ...
>
> It could well be that the alsa-jack plugin only declares two ports ? In
> which case you would have to expand the plugin's code to allow for more
> than 2 ports ... :(
>
> But again, it's just a guess ...
>


Virtual devices used to be done with pcm plugin not the jack plugin.

That config won't work unless the virtual ports have been exposed to jack.

This should work but it's a bit old so not sure if they have changed
anything to break it since it was originally written.

====
# create a virtual four-channel device with two sound devices:
# This is in fact two interleaved stereo streams in
# different memory locations, so JACK will complain that it
# cannot get mmap-based access. see below.

pcm.multi {
        type multi;
        slaves.a.pcm "hw:0,0";
        slaves.a.channels 2;
        slaves.b.pcm "hw:1,0";
        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;
}

# JACK will be unhappy if there is no mixer to talk to, so we set
# this to card 0. This could be any device but 0 is easy.

ctl.multi {
        type hw;
        card 0;
}

# This creates a 4 channel interleaved pcm stream based on
# the multi device. JACK will work with this one.

pcm.ttable {
        type route;
        slave.pcm "multi";
        slave.channels 4;
        ttable.0.0 1;
        ttable.1.1 1;
        ttable.2.2 1;
        ttable.3.3 1;
}
# see above.
ctl.ttable {
        type hw;
        card 0;
}
====

> J.
>
>
>
> ________________________________
>  From: Paul Davis <[hidden]>
> To: Salvatore De Paolis <[hidden]>
> Cc: [hidden]
> Sent: Saturday, June 30, 2012 12:53 PM
> Subject: Re: [Jack-Devel] Alsa Jack Plugin
>
>
>
>
>
> On Sat, Jun 30, 2012 at 5:17 AM, Salvatore De Paolis <[hidden]>
> wrote:
>
> On Fri, 22 Jun 2012 00:00:32 +0200
>>Salvatore De Paolis <[hidden]> wrote:
>>
>>> Hi, I've been following a tutorial where it shows how to set jack with
>>> alsa.
>>> I don't know though if is possible to have such a configuration because
>>> it
>>> doesn't seem to work. Only 0 and 1 seems to be working but when adding
>>> more than 2 playback ports only the first two are emitting sound the
>>> other
>>> are just silently connected,
>>>
>>> pcm.!default {
>>>       type plug
>>>       slave { pcm "jack" }
>>> }
>>>
>>> pcm.jack {
>>>       type jack
>>>       playback_ports {
>>>               0       system:playback_1
>>>               1       system:playback_2
>>>               2       system:playback_3
>>>               3       system:playback_4
>>>       }
>>>       capture_ports {
>>>               0       system:capture_1
>>>               1       system:capture_2
>>>       }
>>> }
>>>
>>> Is it a limitation of the plugin? Any hints are welcome
>>> Regards,
>>
>
> its not the wrong list. silence means that nobody knows the answer and/or
> has the time to reply. nothing more (or less).
>
>
> 
> Jack-Devel mailing list
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> Jack-Devel mailing list
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>


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Patrick Shirkey
Boost Hardware Ltd

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