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I gave JACK a try more than a decade ago, and I remember how cool it was to be able to pipe the audio from one application to the input of another (unrelated) a

I gave JACK a try more than a decade ago, and I remember how cool it was to be able to pipe the audio from one application to the input of another (unrelated) app, possibly adding effects or transformations in between. But JACK never became "mainstream" so I never got to use it for anything serious, but I miss the flexibility it offered even for non professional use-cases. What I wonder is if PipeWire will allow this kind of routing or patching of audio streams as well.

pta2002 6y ago
It does, exactly the same way as JACK, and you can even do it with pulseaudio apps! I could pipe audio from a firefox tab through guitarix (guitar amp emulator) into a second firefox tab if I wanted to. With just JACK or just Pulse this wouldn't be possible. And if I understand it correctly, it should work for video streams too. I'm imagining piping a screenshare through OBS before going into discord or something, should be very useful.
- Nullabillity 6y ago
  You can do that in Pulse, by using null sinks and monitor sources.
  - pta2002 6y ago
    I see what you mean, still a lot more complicated than just dragging a "wire" in qjackctl though.
    - viraptor 6y ago
      https://github.com/futpib/pagraphcontrol https://github.com/futpib/pagraphcontrol It's not super polished, but you can do similar wire dragging here.
teddyfrozevelt 6y ago
I'm running PipeWire on Arch and I can do it through `pw-jack carla`[1]. You can do surprisingly advanced stuff through the JACK compatibility. [1] https://i.imgur.com/EFUxR41.png https://i.imgur.com/EFUxR41.png
- severino 6y ago
  Hey, it looks nice! But, are you required to be running JACK? I mean, isn't this routing capability part of the PipeWire's core?
  - teddyfrozevelt 6y ago
    No, I don't have jackd running. Launching something with `pw-jack` (AFAIK) makes that use the PipeWire libraries instead of the normal JACK ones. I think PipeWire has it's own internal graph that's compatible with ALSA, PulseAudio, and JACK, and that's how it can work with any program. Here's the output of `pw-dot` which is a PipeWire tool that dumps the graph: https://i.imgur.com/OMZCcmC.png https://i.imgur.com/OMZCcmC.png

pta2002 6y ago

It does, exactly the same way as JACK, and you can even do it with pulseaudio apps! I could pipe audio from a firefox tab through guitarix (guitar amp emulator) into a second firefox tab if I wanted to. With just JACK or just Pulse this wouldn't be possible. And if I understand it correctly, it should work for video streams too. I'm imagining piping a screenshare through OBS before going into discord or something, should be very useful.

Nullabillity 6y ago
You can do that in Pulse, by using null sinks and monitor sources.
- pta2002 6y ago
  I see what you mean, still a lot more complicated than just dragging a "wire" in qjackctl though.
  - viraptor 6y ago
    https://github.com/futpib/pagraphcontrol https://github.com/futpib/pagraphcontrol It's not super polished, but you can do similar wire dragging here.

teddyfrozevelt 6y ago

I'm running PipeWire on Arch and I can do it through `pw-jack carla`[1]. You can do surprisingly advanced stuff through the JACK compatibility. [1] https://i.imgur.com/EFUxR41.png https://i.imgur.com/EFUxR41.png

severino 6y ago
Hey, it looks nice! But, are you required to be running JACK? I mean, isn't this routing capability part of the PipeWire's core?
- teddyfrozevelt 6y ago
  No, I don't have jackd running. Launching something with `pw-jack` (AFAIK) makes that use the PipeWire libraries instead of the normal JACK ones. I think PipeWire has it's own internal graph that's compatible with ALSA, PulseAudio, and JACK, and that's how it can work with any program. Here's the output of `pw-dot` which is a PipeWire tool that dumps the graph: https://i.imgur.com/OMZCcmC.png https://i.imgur.com/OMZCcmC.png