make mpv call its audio output audrey

src/playbin.vala

@@ -74,6 +74,7 @@ public class Playbin : GLib.Object {
         this._play_queue = new ListStore (typeof (Subsonic.Song));
 
         assert (this.mpv.initialize () >= 0);
+        assert (this.mpv.set_property_string ("audio-client-name", "audrey") >= 0);
         assert (this.mpv.set_property_string ("user-agent", Audrey.Const.user_agent) >= 0);
         assert (this.mpv.set_property_string ("video", "no") >= 0);
         assert (this.mpv.set_property_string ("prefetch-playlist", "yes") >= 0);
@@ -362,6 +363,15 @@ public class Playbin : GLib.Object {
         }
     }
 
+    public void stop () {
+        debug ("stopping playback");
+        // don't clear the playlist, just in case (less state changes to sync)
+        assert(this.mpv.command({"stop", "keep-playlist"}) >= 0);
+        this.state = PlaybinState.STOPPED;
+        this.play_queue_position = this._play_queue.get_n_items ();
+        this.stopped ();
+    }
+
     ~Playbin () {
         debug ("destroying playbin");
     }

src/ui/window.vala

@@ -116,6 +116,12 @@ class Ui.Window : Adw.ApplicationWindow {
         return stack_child != "play-queue";
     }
 
+    public override bool close_request () {
+        // stop playback on close
+        this.playbin.stop ();
+        return false;
+    }
+
     ~Window () {
         debug ("destroying main window");
     }