Moving files:

wireplumber/scripts/device/find-best-routes.lua

@@ -0,0 +1,77 @@
+-- WirePlumber
+--
+-- Copyright © 2021-2022 Collabora Ltd.
+--    @author George Kiagiadakis <george.kiagiadakis@collabora.com>
+--
+-- Based on default-routes.c from pipewire-media-session
+-- Copyright © 2020 Wim Taymans
+--
+-- SPDX-License-Identifier: MIT
+--
+-- find the best route for a given device_id, based on availability and priority
+
+cutils = require ("common-utils")
+devinfo = require ("device-info-cache")
+log = Log.open_topic ("s-device")
+
+SimpleEventHook {
+  name = "device/find-best-routes",
+  after = "device/find-stored-routes",
+  interests = {
+    EventInterest {
+      Constraint { "event.type", "=", "select-routes" },
+      Constraint { "profile.active-device-ids", "is-present" },
+    },
+  },
+  execute = function (event)
+    local device = event:get_subject ()
+    local event_properties = event:get_properties ()
+    local active_ids = event_properties ["profile.active-device-ids"]
+    local selected_routes = event:get_data ("selected-routes") or {}
+
+    local dev_info = devinfo:get_device_info (device)
+    assert (dev_info)
+
+    -- active IDs are exchanged in JSON format
+    active_ids = Json.Raw (active_ids):parse ()
+
+    for _, device_id in ipairs (active_ids) do
+      -- if a previous hook already selected a route for this device_id, skip it
+      if selected_routes [tostring (device_id)] then
+        goto next_device_id
+      end
+
+      local best_avail = nil
+      local best_unk = nil
+      for _, ri in pairs (dev_info.route_infos) do
+        if cutils.arrayContains (ri.devices, device_id) and
+              (ri.profiles == nil or cutils.arrayContains (ri.profiles, dev_info.active_profile)) then
+          if ri.available == "yes" or ri.available == "unknown" then
+            if ri.direction == "Output" and ri.available ~= ri.prev_available then
+              best_avail = ri
+              ri.save = true
+              break
+            elseif ri.available == "yes" then
+              if (best_avail == nil or ri.priority > best_avail.priority) then
+                best_avail = ri
+              end
+            elseif best_unk == nil or ri.priority > best_unk.priority then
+              best_unk = ri
+            end
+          end
+        end
+      end
+
+      local route = best_avail or best_unk
+      if route then
+        selected_routes [tostring (device_id)] =
+            Json.Object { index = route.index }:to_string ()
+      end
+
+      ::next_device_id::
+    end
+
+    -- save the selected routes for the apply-routes hook
+    event:set_data ("selected-routes", selected_routes)
+  end
+}:register ()