Pipewire configuration for webmeetings and audio mixers

README

This directory contains some mappings used for: 

1] Managing webmeeting audio with OBS; and 
2] Virtual sinks which map to the Mackie ProFX12v3 4-channel audio output
   (where channels 3-4 can appear on the mixing board as an input)

The two targets are the ProFX mixer and the Scarlett 2i2 interface box. 

To enable the Scarlett as the output device:
1] Uncomment the appropriate target.object line in webmeeting.conf
2] Rename ProFX.conf to ProFX.conf.disabled

To enable the ProFX as the output device: 
1] Uncomment the appropriate target.object line in webmeeting.conf
2] Rename ProFX.conf.disabled to ProFX.conf

Then run:
systemctl --user restart pipewire

To use OBS to manage sound for webmeetings:

A] In OBS
  1] Settings -> Audio -> Desktop Audio == "Default Non-Webmeeting Audio"
  2] Settings -> Audio -> Desktop Audio 2 == "Webmeeting Audio" 
  3] Settings -> Audio -> Mic/Aux Audio   ==  < Your microphone source > (ProFX or Scarlett)
  4] Settings -> Audio -> Monitoring Device   ==  Monitor of OBS Audio
  5] Audio Mixer Panel -> 3 Vertical Dots -> Desktop Audio -> Audio Monitoring == Monitor and Output
  6] Audio Mixer Panel -> 3 Vertical Dots -> Desktop Audio 2 -> Audio Monitoring == Monitor Off
  7] Audio Mixer Panel -> 3 Vertical Dots -> Mic/Aux -> Audio Monitoring == Monitor and Output
B] In webmeeting software
  1] Set speaker to "Webmeeting Audio"
  2] Set microphone to "OBS Audio"

ProFX.conf.disabled

context.modules = [
{   name = libpipewire-module-loopback
    args = {
        node.description = "ProFX Channels 3-4"
        #target.delay.sec = 1.5
        capture.props = {
            node.name = "ProFX_3_4"
            media.class = "Audio/Sink"
            audio.channels = 2
            audio.position = [ FL FR ]
        }
        playback.props = {
            node.name = "playback.ProFX_3_4"
            audio.channels = 2
            audio.position = [ RL RR ]
            target.object = "alsa_output.usb-LOUD_Technologies_Inc._ProFX-00.analog-surround-40"
            #node.dont-reconnect = true
            stream.dont-remix = true
            #node.passive = true
        }
    }
}
{   name = libpipewire-module-loopback
    args = {
        node.description = "ProFX Channels 1-2"
        #target.delay.sec = 1.5
        capture.props = {
            node.name = "ProFX_1_2"
            media.class = "Audio/Sink"
            audio.channels = 2
            audio.position = [ FL FR ]
        }
        playback.props = {
            node.name = "playback.ProFX_1_2"
            audio.channels = 2
            audio.position = [ FL FR ]
            target.object = "alsa_output.usb-LOUD_Technologies_Inc._ProFX-00.analog-surround-40"
            #node.dont-reconnect = true
            stream.dont-remix = true
            #node.passive = true
        }
    }
}
]

webmeeting.conf

context.modules = [
{   name = libpipewire-module-loopback
    args = {
        node.description = "Webmeeting Audio"
        capture.props = {
            node.name = "input.webmeeting_audio"
            media.class = "Audio/Sink"
            audio.channels = 2
            #stream.dont-remix = true
        }
        playback.props = {
            node.name = "playback.webmeeting_audio"
            audio.channels = 2
            #target.object = "ProFX_3_4"
            target.object = "alsa_output.usb-Focusrite_Scarlett_2i2_USB_Y8ATAE5079692D-00.Direct__hw_USB__sink"
        }
    }
}
{   name = libpipewire-module-loopback
    args = {
        node.description = "Default Non-Webmeeting Audio"
        capture.props = {
            node.name = "input.dummy_default"
            media.class = "Audio/Sink"
            audio.channels = 2
            audio.position = [ FL FR ]
        }
        playback.props = {
            node.name = "playback.dummy_default"
            audio.channels = 2
            #target.object = "ProFX_3_4"
            target.object = "alsa_output.usb-Focusrite_Scarlett_2i2_USB_Y8ATAE5079692D-00.Direct__hw_USB__sink"
            stream.dont-remix = true
        }
    }
}
{   name = libpipewire-module-loopback
    args = {
        node.description = "OBS Audio"
        capture.props = {
            node.name = "input.obs_monitor"
            media.class = "Audio/Sink"
            audio.channels = 2
            #stream.dont-remix = true
        }
        playback.props = {
            node.name = "playback.obs_monitor"
            media.class = "Audio/Source"
            audio.channels = 2
        }
    }
}
]