Properties:

• CURRENT_TIME_CHANGED <Kind>
  Current time changed.
• PLAY_STATE_CHANGED <Kind>
  Play state changed.
• MUTED_CHANGED <Kind>
  Mute changed.
• VOLUME_CHANGED <Kind>
  Volume changed.
• PLAYBACK_RATE_CHANGED <Kind>
  Playback rate changed.
• FULLSCREEN_CHANGED <Kind>
  Fullscreen changed.