Audient iD4 with pipewire: split mic and DI inputs into separate streams

audient_id4_pipewire.md

UPDATE

The workaround is no longer needed with recent alsa-ucm, e.g. alsa-ucm-1.2.11-2.fc39. Just configure the device to use Default Alsa Profile instead of Pro.

old workaround

• cp /usr/share/pipewire/media-session.d/media-session.conf ~/.config/pipewire/media-session.d/
• add loopback modules to context.modules section
• configure interface to use Pro Audio profile
• systemctl restart --user pipewire.service pipewire-pulse.service

context.modules = [
    ...
    {   name = libpipewire-module-loopback
        args = {
            node.name = "audient_id4_mic"
            node.description = "Audient iD4 Mic (Pro Audio)"
            capture.props = {
                # audio.position = [ FL ]
                # node.target = "alsa_input.usb-Audient_iD4-00.analog-stereo"
                # node.target = "alsa_input.usb-Audient_iD4-00.iec958-stereo"
                audio.position = [ AUX0 ]
                node.target = "alsa_input.usb-Audient_iD4-00.pro-input-0"
                node.passive = true
                stream.dont-remix = true
            }
            playback.props = {
                media.class = "Audio/Source"
                audio.position = [ MONO ]
            }
        }
    }
    {   name = libpipewire-module-loopback
        args = {
            node.name = "audient_id4_di"
            node.description = "Audient iD4 DI (Pro Audio)"
            capture.props = {
                # audio.position = [ FR ]
                # node.target = "alsa_input.usb-Audient_iD4-00.analog-stereo"
                # node.target = "alsa_input.usb-Audient_iD4-00.iec958-stereo"
                audio.position = [ AUX1 ]
                node.target = "alsa_input.usb-Audient_iD4-00.pro-input-0"
                node.passive = true
                stream.dont-remix = true
            }
            playback.props = {
                media.class = "Audio/Source"
                audio.position = [ MONO ]
            }
        }
    }
]

Sources:

• https://gitlab.freedesktop.org/pipewire/pipewire/-/wikis/Virtual-Devices#behringer-umc404hd-micguitar-virtual-sources
• https://blogshit.baka.fi/2021/07/pipewire-microphone/