[Lxc-users] LXC - ALSA & Audio in container

[TuxRaiderPen]

In my quest to expand LXC use  beyond my current use and possibly solve a 
little niche item for myself...

After seeing a thread about using a certain VOIP/web cam package inside a LXC 
conatiner I am curious about how this might play out for my little area.

So...while using something like screen in some cases or any or all might be 
simpler and less cumbersome solution... LXC offers a little bit more of a 
regimented and segmented method whereby each little operation is in its own 
little world (container)....

The thread about the the VOIP/webcam program mentioned about giving access to 
devices....

With that in mind...and one other caveat pulseaudio is OUT, VERBOTEN, 
PROHIBITED, WILL NOT TOUCH MY SYSTEMS EVER! This is one of the first things I 
remove... it just doesn't work.

Since another thread mentions that sharing an ALSA device is not going to work 
and would violate the above..

http://www.jonnor.com/2010/03/hardware-passthrough-in-lxc-or-running-a-
desktop-in-a-cgroup/

http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg01107.html

Ok... having each container have its own little USB audio device is fine..

So what needs to be in the LXC container conf to allow this... I reviewed one 
for arch... but I don't use that, and it is honestly above my pay grade... 

http://pastebin.com/yjDMLppn

Setup:

LXC Host Kubuntu 12.04 LTR ALSA ONLY! LXC 0.7.5 minimum 

LXC containers would be the standard 

lxc-create -n Audio1 -t ubuntu 
lxc-create -n Audio2 -t ubuntu 

Where the HOST audio -> LXC HOST - No change HW: 0,1

Audio1 = ALSA HW 1,1
Audio2= ALSA HW 2,1
etc...

If there was a chance to use the HOST audio device ala :

/etc/asound.conf 
pcm.onboard{
    type hw
    card 0
}
ctl.onboard {
    type hw
    card 0
}
### Dsnoop both channels
pcm.dsnoop_onboard {
    type dsnoop
    ipc_key 32
    slave {
        pcm "onboard"
        channels 2
        period_size 320
        rate 48000
        buffer_size 8192
        format S32_LE
    }
    bindings {
        0 0
        1 1
    }
}
### Dsnoop splited channels
pcm.onboard_left {
     type dsnoop
     ipc_key 32
     slave {
         pcm "onboard"
         channels 2
     }
     bindings.0  0
}

pcm.onboard_right {
     type dsnoop
     ipc_key 32
     slave {
         pcm "onboard"
         channels 2
     }
     bindings.0  1
}

### PLUGS ##
### used with darkice
### device = plug:plug_onboard_left
pcm.plug_onboard_left{
        type route
        slave.pcm "onboard_left"
        slave.channels 1
        ttable.0.0 1
}
pcm.plug_onboard_right{
        type route
        slave.pcm "onboard_right"
        slave.channels 1
        ttable.0.0 1
}

where then 

plug_onboard_left = mic in on LXC Audio1
plug_onboard_right = mic in on LXC Audio2

and if I were to do the following (untested)

pcm.onboard{
    type hw
    card 1
}
ctl.onboard {
    type hw
    card 1
}

create say pcm.plug_onboard_rt and pcm_plug_onboard_lt etc 

where 
plug_onboard_rt = mic in ALSA LXC Audio3 
pcm_plug_onboard_lt = mic in ALSA LXC Audio4
etc...

Any one doing any routing of sound devices to LXC containers ?? ? 

Thanks in advance.