pw-info - Description

Small utility written in Go that can find and filter pipewire objects based on their properties.
Uses pw-cli ls to get the data.

This small utility has been motivated by the fact that pipewire does not have a nicer way of finding nodes other than using their ids.

Neither it or wireplumber makes it easy through cli to find the node's property.

Usage

Get node based on property value:

$ pw-info find-node node.name alsa_output.pci-0000_31_00.4.analog-stereo
id: 1
type: PipeWire:Interface:Node/3

Get node property based on id:

$ pw-info find-node-property 1 node.description
node.description: Headphones

Use-cases

For example, if you know the alsa node name; and you use wireplumber to set its custom description for your riced desktop and would like that custom name appearing instead of default name.

# alsa-headphones.lua
rule = {
    matches = {
      {
        { "node.name", "equals", "alsa_output.pci-0000_31_00.4.analog-stereo" },
      },
    },
    apply_properties = {
      ["node.description"] = "Headphones",
    },
  }
  
  table.insert(alsa_monitor.rules,rule)

Now, getting the name of the default sink works kinda like this with this utility:

# this will get you something like: alsa_output.pci-0000_31_00.4.analog-stereo
DEFAULT_SINK_ID=$(pactl get-default-sink)

# this will get you the volume in percentage
VOLUME=$(pamixer --get-volume-human | grep '%' | head -n 1 | cut -d '[' -f 2 | cut -d '%' -f 1)

# this will get you the description you put in wireplumber: Headphones
CUSTOM_SINK_NAME=$(pw-info find-node -s node.name alsa_output.pci-0000_31_00.4.analog-stereo | head -1 | xargs -I{} pw-info find-node-property -s {} node.description)

# we add everything up: 20% Headphone
echo "${VOLUME}% ${CUSTOM_SINK_NAME}"