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Multiple instances using multiple audio devices

Submitted by eddiecthelxman on Thu, 2008-11-20 23:04

I am trying to set up a multi-zone music player and just discovered MOC, but having had a play I discovered that only one instance can run at a time and it only outputs to the default device. Are there any ways to overcome these?

Thanks,
Ed
(Debian 4)

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Half way there...

Submitted by eddiecthelxman on Fri, 2008-11-21 18:39.

OK, the multiple instances part is sorted! How do I go about changing the sound card each one outputs to?

Thank you!
Ed

(Edit: OK, this really should be a reply to the first answer, not the question, but I didn't think of that at the time :-P)

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Setting the output device

Submitted by hiben on Sat, 2008-11-22 14:26.

Setting the output device depends on your driver but is a simple process (did you have a look at the config.example file ?):

I'm using ALSA and have three devices: a SBLive, a VIA CT82XX based onboard sound chip and a USB soundcard. The system is set up so that the cards are asigned sound slots on the give order.
In order to select the cards I have following entries in my $HOME/.asoundrc:

pcm.!default {
  type hw
  card 0
}

ctl.!default {
  type hw           
  card 0
}

pcm.live {
  type hw
  card 0
}

ctl.live {
  type hw
  card 0
}

pcm.via {
  type hw
  card 1
}

ctl.via {
  type hw           
  card 1
}

pcm.usb {
  type hw
  card 2
}

ctl.usb {
  type hw           
  card 2
}

These entries map choosen names (live, via, usb) to the cards (0,1,2).

In MOCs config file I have:

# ALSA mixer device
AlsaMixer               = PCM                                                                                             

# Second ALSA mixer device
AlsaMixer2              = Master

# ALSA output device
AlsaDevice              = live

for the SBLive

and 

# ALSA mixer device
AlsaMixer               = Speaker                                                                                         

# Second ALSA mixer device
AlsaMixer2              = Master

# ALSA output device
AlsaDevice              = usb

for the USB audio device.

(Check mixer-names with alsamixer or similar to match your devices)

For other drivers (JACK, OSS) the procedure varies but is not really any more complex.

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You could specify a different

Submitted by hiben on Fri, 2008-11-21 07:12.

You could specify a different directory for MOC (-M option) to read its configuration from (and to store its socket in).
This way you can run as many server/client instances with different configurations as you want.
The output driver and device can be set via the config file.

Does this do what you want ?

*edit*
And additionally you can always run as many clients as you want to have multiple interfaces to the same server.

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