title: How to detect level audio level of current segment of mp3 playing using AVAudioPlayer
body: <p>If i am palying a sound using the AVAudioPlayer in the AVFoundation framework (I can already do this), is there any way to detect the current level of the audio playing, like a VU meter that is listening to the mp3 playing.</p>
  
  <p>I don't want to detect the audio of the mic, just the file playing.</p>
  
  <p>I want to animate a mouth to prerecorded audio that will be played, and don't want to program a whole load of animations (100's and 100's).</p>
  
  <p>In a way the mouth is responding like a VU meter.</p>
  
  <p>I can do all the animation I just need to know how to detect the level.</p>
  
  <p>Anyone done this or know how to?</p>