<html>
<script>
  function play_file() {
    var url = String(location.href);
    var filename = url.substr(url.indexOf("?") + 1, url.length)
    var p = document.getElementById("player");
    p.setAttribute("src", filename);
    p.addEventListener("ended", on_ended, true);
    p.load();
    p.play();
    document.getElementById("status").innerHTML = "Playing";
  }
  function on_ended() {
    document.getElementById("status").innerHTML = "Ended";
  }
</script>

<body onload="play_file()">
  <audio controls id="player"></audio>
  <div id="status">N/A</div>
</body>
</html>