title: core audio: is zero equivalent to silence only for PCM audio?
body: <p>I'm trying to create a basic algorithm that does packet loss concealment for core audio. I simply want to replace the missing data with silence.. in the book learning core audio, the author says that in lossless PCM, zeros mean silence. I was wondering if I'm playing VBR (ie compressed data), would putting zeros suffice for silence as well? </p>
  
  <p>In my existing code.. when I plug zeros into the audio queue.. it suddenly jams (ie it no longer frees up consumed data in the audio queue callback..) and i'm wondering why</p>