Youtube API: See which video id is currently playing

Is there a way to display/see/return which video (so, which videoID) is playing at the moment?

This is the basic code of the Iframe API:

var player;
  function onYouTubeIframeAPIReady() {
    player = new YT.Player('player', {
      height: '390',
      width: '640',
      videoId: 'pJ18QeQy0e8',
      events: {
        'onReady': onPlayerReady,
        'onStateChange': onPlayerStateChange,
        'onError': onError,
      },
        playerVars: {

                    'controls': 0,
                    'showinfo': 0,
                    'iv_load_policy': 3,
                    'wmode': "opaque",
                },
    });
  }

after the first video has finished. This event will be called:

  function onPlayerStateChange(event) {
if(event.data === 0) {    
        player.stopVideo();
player.loadVideoById(getId());          

        }
  }

The getId() function will get another videoId to play..

I want to display in a DIV, which videoId is currently playing