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aw1cks

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From: UK

Registered: 2017-01-31

Posts: 10

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Mono app output only audible in one channel after pipewire update

I recently updated to pipewire 0.3.39. Since doing so, Mumble has stopped outputting audio to both channels, and now only outputs to the left channel. I suspect this is due to its output being mono.

I found this issue which seems to be the root cause: https://gitlab.freedesktop.org/pipewire … ssues/1778
However my DAC doesn't have multiple outputs, so I don't see how this would be applicable to me.

Does anyone know how to work around this? I tried adding a virtual sink like so:

pw-loopback --capture-props='media.class=Audio/Sink node.name=mono audio.position=[FL FL]' --playback-props='audio.position=[FL FR]'

But no audio came back from this.

~» pipewire --version
pipewire
Compiled with libpipewire 0.3.39
Linked with libpipewire 0.3.39
~»

~» pactl list sinks
Sink #42
	State: RUNNING
	Name: alsa_output.usb-Topping_DX7_Pro-00.pro-output-0
	Description: DX7 Pro Pro
	Driver: PipeWire
	Sample Specification: s32le 2ch 48000Hz
	Channel Map: aux0,aux1
	Owner Module: 4294967295
	Mute: no
	Volume: aux0: 65536 / 100% / 0.00 dB,   aux1: 65536 / 100% / 0.00 dB
	        balance 0.00
	Base Volume: 65536 / 100% / 0.00 dB
	Monitor Source: alsa_output.usb-Topping_DX7_Pro-00.pro-output-0.monitor
	Latency: 0 usec, configured 0 usec
	Flags: HARDWARE DECIBEL_VOLUME LATENCY 
	Properties:
		object.path = "alsa:pcm:2:hw:2,0:playback"
		api.alsa.path = "hw:2,0"
		api.alsa.pcm.card = "2"
		api.alsa.pcm.stream = "playback"
		audio.channels = "2"
		audio.position = "AUX0,AUX1"
		device.routes = "0"
		alsa.resolution_bits = "32"
		device.api = "alsa"
		device.class = "sound"
		alsa.class = "generic"
		alsa.subclass = "generic-mix"
		alsa.name = "USB Audio"
		alsa.id = "USB Audio"
		alsa.subdevice = "0"
		alsa.subdevice_name = "subdevice #0"
		alsa.device = "0"
		alsa.card = "2"
		alsa.card_name = "DX7 Pro"
		alsa.long_card_name = "Topping DX7 Pro at usb-0000:08:00.1-6.1, high speed"
		alsa.driver_name = "snd_usb_audio"
		device.profile.name = "pro-output-0"
		device.profile.description = "Pro"
		card.profile.device = "0"
		device.id = "39"
		factory.name = "api.alsa.pcm.sink"
		priority.driver = "872"
		priority.session = "872"
		media.class = "Audio/Sink"
		node.nick = "DX7 Pro"
		node.name = "alsa_output.usb-Topping_DX7_Pro-00.pro-output-0"
		device.description = "DX7 Pro Pro"
		device.icon_name = "audio-card"
		device.bus = "usb"
		device.bus_path = "pci-0000:08:00.1-usb-0:6.1:1.0"
		node.pause-on-idle = "false"
		factory.id = "18"
		client.id = "32"
		node.driver = "true"
		factory.mode = "merge"
		audio.adapt.follower = ""
		library.name = "audioconvert/libspa-audioconvert"
		object.id = "42"
		node.max-latency = "32768/48000"
	Formats:
		pcm

Sink #41
	State: SUSPENDED
	Name: alsa_output.usb-Focusrite_Scarlett_Solo_USB-00.pro-output-0
	Description: Scarlett Solo USB Pro
	Driver: PipeWire
	Sample Specification: s32le 2ch 48000Hz
	Channel Map: aux0,aux1
	Owner Module: 4294967295
	Mute: no
	Volume: aux0: 65536 / 100% / 0.00 dB,   aux1: 65536 / 100% / 0.00 dB
	        balance 0.00
	Base Volume: 65536 / 100% / 0.00 dB
	Monitor Source: alsa_output.usb-Focusrite_Scarlett_Solo_USB-00.pro-output-0.monitor
	Latency: 0 usec, configured 0 usec
	Flags: HARDWARE DECIBEL_VOLUME LATENCY 
	Properties:
		object.path = "alsa:pcm:3:hw:3,0:playback"
		api.alsa.path = "hw:3,0"
		api.alsa.pcm.card = "3"
		api.alsa.pcm.stream = "playback"
		audio.channels = "2"
		audio.position = "AUX0,AUX1"
		device.routes = "0"
		alsa.resolution_bits = "32"
		device.api = "alsa"
		device.class = "sound"
		alsa.class = "generic"
		alsa.subclass = "generic-mix"
		alsa.name = "USB Audio"
		alsa.id = "USB Audio"
		alsa.subdevice = "0"
		alsa.subdevice_name = "subdevice #0"
		alsa.device = "0"
		alsa.card = "3"
		alsa.card_name = "Scarlett Solo USB"
		alsa.long_card_name = "Focusrite Scarlett Solo USB at usb-0000:08:00.1-6.4, high speed"
		alsa.driver_name = "snd_usb_audio"
		device.profile.name = "pro-output-0"
		device.profile.description = "Pro"
		card.profile.device = "1"
		device.id = "40"
		factory.name = "api.alsa.pcm.sink"
		priority.driver = "808"
		priority.session = "808"
		media.class = "Audio/Sink"
		node.nick = "Scarlett Solo USB"
		node.name = "alsa_output.usb-Focusrite_Scarlett_Solo_USB-00.pro-output-0"
		device.description = "Scarlett Solo USB Pro"
		device.icon_name = "audio-card"
		device.bus = "usb"
		device.bus_path = "pci-0000:08:00.1-usb-0:6.4:1.0"
		node.pause-on-idle = "false"
		factory.id = "18"
		client.id = "32"
		node.driver = "true"
		factory.mode = "merge"
		audio.adapt.follower = ""
		library.name = "audioconvert/libspa-audioconvert"
		object.id = "41"
		node.max-latency = "32768/48000"
	Formats:
		pcm
~»