Sound Notification: Fix Node Suspend on Idle (Bluetooth battery drain) (wbolster#74)

Enabling "Sound notification" seem to cause Bluetooth battery drain.

It seems the mic on/off sound state doesn't get reset after playback; audio source state is still "Running".

Fix resets playback at end-of-stream, so Pipewire can auto-suspend node (e.g. Bluetooth headset).

Co-authored-by: Kok-Yan Lo <[email protected]>

Author: klo2k

extension.js

@@ -127,6 +127,15 @@ function init_sound(dir, name) {
   const sink = Gst.ElementFactory.make("pulsesink", "sink");
   playbin.set_property("audio-sink", sink);
   playbin.set_volume(GstAudio.StreamVolumeFormat.LINEAR, 0.5);
+
+  // Fix audio node suspend-on-idle; stop playback at end-of-stream
+  const bus = playbin.get_bus();
+  bus.add_signal_watch();
+  bus.connect('message', (_bus, msg) => {
+    if (msg.type === Gst.MessageType.EOS)
+      playbin.set_state(Gst.State.NULL);
+  });
+
   return playbin;
 }