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oxygen_wobble

Member

Registered: 2012-05-20

Posts: 131

[SOLVED][PIPEWIRE] How to rename inputs/outputs for USB audio device ?

Hi,

I have a Behringer UMC1820 USB audio interface. By default, it uses the AUX naming conventions, so channels are named playback_AUX0, playback_AUX1, etc.

For an experiment I want to try to use the "consumer" naming convention, with channels named playback_FL, playback_FR etc.

I  can select various profile (i.e. "Pro Audio" or "Multichannel Duplex", but they all use the AUX convention.

I've tried various routes ...

Adding a udev rule and a custom profile in

/usr/share/alsa-card-profile/mixer/profile-sets

didn't work.

Adding this config file to 

~/.config/wireplumber/wireplumber.conf.d/50-alsa-config.conf

didn't work (i tried with and without the acp option):

monitor.alsa.rules = [
    {
        matches = [
            {
                device.name = "~alsa_output.usb-BEHRINGER_UMC1820_16928CC7-00*"
            }
        ]
        actions = {
            update-props = {
	        api.alsa.use-acp = false		                
		audio.position = [ "FL", "FR", "RL", "RR", "SL", "SR", "FC", "LFE", "AUX0", "AUX1", "AUX2", "AUX3"]
            }
        }
    }
]

I'm not even sure whether this file is loaded? Not sure how to check ...

Anyway, it seems like none of these attempts have any effect ... what am I missing here?

Best,
n

Last edited by oxygen_wobble (Today 12:40:26)

oxygen_wobble

Member

Registered: 2012-05-20

Posts: 131

Re: [SOLVED][PIPEWIRE] How to rename inputs/outputs for USB audio device ?

Alright, solved it ... basically, you first have to switch of ACP on the DEVICE, then set the property on the NODE:

monitor.alsa.rules = [
    {
        matches = [
            {
                device.name = "alsa_card.usb-BEHRINGER_UMC1820_16928CC7-00"
            }
        ]
        actions = {
            update-props = {
                api.alsa.use-acp = false
                #api.alsa.use-ucm = false
                #device.profile = "pro-audio"
                #audio.position = [ "FL", "FR", "RL", "RR", "SL", "SR", "FC", "LFE", "AUX0", "AUX1", "AUX2", "AUX3"]
                #audio.channels = 12
            }
        }
    }
    {
       matches = [
            {
                node.name = "alsa_output.usb-BEHRINGER_UMC1820_16928CC7-00.playback.0.0"
            }              
        ]
        actions = {
            update-props = {
                #api.alsa.use-acp = false
                #api.alsa.use-ucm = false
                #device.profile = "pro-audio"
                audio.position = [ "FL", "FR", "RL", "RR", "SL", "SR", "FC", "LFE", "AUX0", "AUX1", "AUX2", "AUX3"]
                audio.channels = 12
            }
        }
    }
]

That way, I can re-name the channel properties.