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pipewire/.config/wireplumber/scripts/linking/find-user-target.lua.example

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+-- WirePlumber
+--
+-- Copyright © 2022 Collabora Ltd.
+--
+-- SPDX-License-Identifier: MIT
+--
+-- example of a user injectible hook to link a node to a custom target
+
+lutils = require ("linking-utils")
+log = Log.open_topic ("s-linking")
+
+SimpleEventHook {
+  name = "linking/sample-find-user-target",
+  before = "linking/find-defined-target",
+  interests = {
+    EventInterest {
+      Constraint { "event.type", "=", "select-target" },
+    },
+  },
+  execute = function (event)
+    local source, om, si, si_props, si_flags, target =
+        lutils:unwrap_select_target_event (event)
+
+    -- bypass the hook if the target is already picked up
+    if target then
+      return
+    end
+
+    log:info (si, "in find-user-target")
+
+    -- implement logic here to find a suitable target
+
+    -- store the found target on the event,
+    -- the next hooks will take care of linking
+    event:set_data ("target", target)
+  end
+}:register ()