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I'd like to create a dynamically named audio source that can then be referenced by other programs on my system. For example something like this:

gst-launch-1.0 audiotestsrc ! alsapubsink name='Test Source'

and then I'd reference it in other programs like:

gst-launch-1.0 alsasrc device='Test Source' ! ... ! autoaudiosink

Of course there is no alsapubsink element. Is there any means of doing this sort of thing using either ALSA or Pulse, or perhaps other tools I'm not aware of?

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In Pulseaudio: Make a "null" sink

pacmd load-module module-null-sink sink_name=public-sink-1 sink_properties=device.description=Public-Sink-1

then use pavucontrol, command line options or application menu options (if available) to redirect all sound output you want to "reference" to this sink.

Every Pulseaudio sink has an associated .monitor source, so other applications can record or process audio from this associated source in the normal way (i.e., selecting the source with pavucontrol etc.).

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