gst demo.js

import Gst from "gi://Gst";
import GstPlay from "gi://GstPlay";
import GLib from "gi://GLib";

Gst.init(null);

const player = GstPlay.Play.new(null);

player.set_uri("file:///home/alien/Music/horizon.mp3");

const bus = player.get_message_bus();
bus.add_signal_watch();

bus.connect("message", (_, message) => {
  const play_message = GstPlay.play_message_parse_type(message);

  if (play_message != null) {
    switch (play_message) {
      case GstPlay.PlayMessage.URI_LOADED:
        console.log("uri loaded");
        player.play();
        break;
      case GstPlay.PlayMessage.ERROR:
        console.log(
          "error",
          GstPlay.play_message_parse_error(message)[0].toString(),
        );
        break;
      default:
        console.log("message", GstPlay.play_message_get_name(play_message));
        break;
    }
  }
});

const loop = new GLib.MainLoop(null, false);
loop.run();