title: how to read pcm samples from a file using fread and fwrite?
body: <p>I want to read pcm samples from a file using fread and want to determine the signal strength of the samples.How do I go about it?</p>
  
  <p>For reading, how many bytes constitute 1 pcm sample? Can I read more than 1 pcm sample at a time?
   This is for WAV and AAC files.</p>