New wireplumber config

.config/wireplumber/scripts/linking/find-media-role-target.lua

@@ -0,0 +1,70 @@
+-- WirePlumber
+--
+-- Copyright © 2024 Collabora Ltd.
+--
+-- SPDX-License-Identifier: MIT
+--
+-- Select the media role target
+
+cutils = require("common-utils")
+lutils = require("linking-utils")
+log = Log.open_topic("s-linking")
+
+SimpleEventHook {
+  name = "linking/find-media-role-target",
+  after = { "linking/find-defined-target",
+            "linking/find-filter-target" },
+  before = "linking/prepare-link",
+  interests = {
+    EventInterest {
+      Constraint { "event.type", "=", "select-target" },
+    },
+  },
+  execute = function (event)
+    local _, om, si, si_props, _, target =
+        lutils:unwrap_select_target_event (event)
+
+    local target_direction = cutils.getTargetDirection (si_props)
+    local media_role = si_props["media.role"]
+
+    -- bypass the hook if the target is already picked up or if the role is not
+    -- defined
+    if target or media_role == nil then
+      return
+    end
+
+    log:info (si, string.format ("handling item %d: %s (%s) role (%s)", si.id,
+      tostring (si_props ["node.name"]), tostring (si_props ["node.id"]), media_role))
+
+    for si_target in om:iterate {
+      type = "SiLinkable",
+      Constraint { "item.node.direction", "=", target_direction },
+      Constraint { "device.intended-roles", "+" },
+      Constraint { "media.type", "=", si_props["media.type"] },
+    } do
+
+      local roles_json = si_target.properties["device.intended-roles"]
+      local roles_table = Json.Raw(roles_json):parse()
+
+      for _, target_role in ipairs(roles_table) do
+        if target_role == media_role then
+          target = si_target
+          break
+        end
+      end
+
+      if target then
+        break
+      end
+    end
+
+    -- set target
+    if target ~= nil then
+      log:info(si,
+        string.format("... media role target picked: %s (%s)",
+          tostring(target.properties["node.name"]),
+          tostring(target.properties["node.id"])))
+      event:set_data("target", target)
+    end
+  end
+}:register()