New wireplumber config

.config/wireplumber/scripts/node/suspend-node.lua

@@ -0,0 +1,65 @@
+-- WirePlumber
+--
+-- Copyright © 2021 Collabora Ltd.
+--    @author George Kiagiadakis <george.kiagiadakis@collabora.com>
+--
+-- SPDX-License-Identifier: MIT
+
+log = Log.open_topic ("s-node")
+
+sources = {}
+
+SimpleEventHook {
+  name = "node/suspend-node",
+  interests = {
+    EventInterest {
+      Constraint { "event.type", "=", "node-state-changed" },
+      Constraint { "media.class", "matches", "Audio/*" },
+    },
+    EventInterest {
+      Constraint { "event.type", "=", "node-state-changed" },
+      Constraint { "media.class", "matches", "Video/*" },
+    },
+  },
+  execute = function (event)
+    local node = event:get_subject ()
+    local new_state = event:get_properties ()["event.subject.new-state"]
+
+    log:debug (node, "changed state to " .. new_state)
+
+    -- Always clear the current source if any
+    local id = node["bound-id"]
+    if sources[id] then
+      sources[id]:destroy()
+      sources[id] = nil
+    end
+
+    -- Add a timeout source if idle for at least 5 seconds
+    if new_state == "idle" or new_state == "error" then
+      -- honor "session.suspend-timeout-seconds" if specified
+      local timeout =
+          tonumber(node.properties["session.suspend-timeout-seconds"]) or 5
+
+      if timeout == 0 then
+        return
+      end
+
+      -- add idle timeout; multiply by 1000, timeout_add() expects ms
+      sources[id] = Core.timeout_add(timeout * 1000, function()
+        -- Suspend the node
+        -- but check first if the node still exists
+        if (node:get_active_features() & Feature.Proxy.BOUND) ~= 0 then
+          log:info(node, "was idle for a while; suspending ...")
+          node:send_command("Suspend")
+        end
+
+        -- Unref the source
+        sources[id] = nil
+
+        -- false (== G_SOURCE_REMOVE) destroys the source so that this
+        -- function does not get fired again after 5 seconds
+        return false
+      end)
+    end
+  end
+}:register ()