[LAU] Re: Sending audio to a pipewire sink

Hi Mitsch,

On Wed, 17 Dec 2025 17:17:52 +0100 Michael Jarosch wrote:

> Hi, there!
> 
> Everything's just easy with pipewire, isn't it?
> 
> Well, since pipewire's here I have some problems with it using my 
> beloved linux-show-player (LiSP) in combination with jack-output.
> 
> So, I'd like to use a workaround using console-commands…
> 
> I have a build-in audio device and a bluetooth connection, pw-top lists 
> these devices:
> 
> Dummy-Driver
> Freewheel-Driver
> […]
> alsa-output.pci-0000_00_1b.0.analog-stereo
> […]
> bluez_output.[bluetooth-adress].1
> […]
> 
> How do I send a stereo or mono audio stream to the bluez-output with a 
> console command? Can I use aplay? (Because aplay -L doesn't list the 
> bluetooth speaker…)
> 
> Any ideas?

pw-link.

I've also used qpwgraph's patchbay, but I found it a little slower
than pw-link. I use pw-link (and jack-play) via Qt's qprocesses.

pw-link -io will show the ins and outs available. Mine look like:

alsa_output.pci-0000_01_00.1.hdmi-stereo:monitor_FL
alsa_output.pci-0000_01_00.1.hdmi-stereo:monitor_FR
alsa_output.pci-0000_01_00.1.hdmi-stereo:playback_FL
alsa_output.pci-0000_01_00.1.hdmi-stereo:playback_FR
alsa_output.usb-Burr-Brown_from_TI_USB_Audio_DAC-00.analog-stereo:monitor_FL
alsa_output.usb-Burr-Brown_from_TI_USB_Audio_DAC-00.analog-stereo:monitor_FR
alsa_output.usb-Burr-Brown_from_TI_USB_Audio_DAC-00.analog-stereo:playback_FL
alsa_output.usb-Burr-Brown_from_TI_USB_Audio_DAC-00.analog-stereo:playback_FR

I use pw-link with these arguments:
connectOpts << "j-play:out_1" << "alsa_output.usb-Burr-Brown_from_TI_USB_Audio_DAC-00.analog-stereo:playback_FL";
(and similar for FR. connectOpts is a QstringList)

When it's playing; I can use pw-link -l to show the links:
$ pw-link -l
alsa_output.usb-Burr-Brown_from_TI_USB_Audio_DAC-00.analog-stereo:playback_FL
  |<- j-play:out_1
alsa_output.usb-Burr-Brown_from_TI_USB_Audio_DAC-00.analog-stereo:playback_FR
  |<- j-play:out_2
j-play:out_1
  |-> alsa_output.usb-Burr-Brown_from_TI_USB_Audio_DAC-00.analog-stereo:playback_FL
j-play:out_2
  |-> alsa_output.usb-Burr-Brown_from_TI_USB_Audio_DAC-00.analog-stereo:playback_FR

I expect there are better ways, but it works very well for me.

-- 
Rather you than me, said the kangaroo to the flea.
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