title: Play IOS Music Library Content Using AVFoundation
body: <p>I'm attempting to write an IOS app that will play my iPhone music library content, showing artwork, and "announcing" title, artist, etc.</p>
  
  <p>I have it working nicely using Apple's Media Player framework.  I can display Playlist names and queue the songs in a selected Playlist.
  I use the "MPMusicPlayerControllerNowPlayingItemDidChange" observer notification to pause playback, retrieve metadata, and do the announcements via AVSpeechSynthesizer.
  I was a happy camper until I ran into the dreaded "Media Player framwork doesn't respond to observer notifications in background" issue.</p>
  
  <p>So, I started looking at the AVFoundation Framework.  I found a sample that plays local song files via URLs in the background and.
  I'm failing miserably in attempting to retrieve Music Library content via the AVFoundation.
  I have also failed in supplying content retrieved via the Media Player framework to the AVFoundation player.
  (Note: The URLs retrieved from MPMediaItem are of a bogus "<em>ipod-library://item/item.m4a?id=#########################</em>" format. Creating AVPlayerItem with this "URL" doesn't work.)</p>
  
  <p>Has anyone managed to accomplish this?  I'm developing for my own usage.  I have no intention of posting the app in Apple's App Store, so I'm willing to use hidden APIs or un-Apple approved methodology.</p>
  
  <p><em>A Swift code example would be great. (Objective-C not so much)</em></p>