title: Determining the sample rate of a large audio file in javascript?
body: <p>In javascript, I am converting mp3 data in the form of an array buffer into an object URL with <code>window.URL.createObjectURL</code> ... how could I determine the sample rate of the mp3 file?</p>
  
  <p>I could use the web audio API to load the samples of the audio into memory, but the mp3 file is 300MB ...</p>
  
  <p>Can the web audio API determine the sample rate of an audio element without creating an <code>AudioBuffer</code>?</p>