title: How can I query chapter metadata from a m4a file?
body: <p>I need to write some code that will let me query a m4a file and extract the chapter information out.  Including:</p>
  
  <ul>
  <li>chapter name</li>
  <li>chapter start time</li>
  <li>chapter artwork</li>
  </ul>
  
  <p>I did some quick searching and it seems this is viewed as proprietary information by Apple?  I found some discussions, but most were from 2005.   Also there have been some similar questions on here, but more for CREATING m4a files with chapters, not querying.   </p>
  
  <p>Is this just something I have to DIY, cause there isn't a nice apple API for me to use?  Or am I missing something obvious?</p>
  
  <p>Also, ideally I need whatever technique I end up using to work on the iPhone.</p>