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panning with Audio Queue
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panning with Audio Queue


  • Subject: panning with Audio Queue
  • From: Matthew Pease <email@hidden>
  • Date: Sat, 24 Oct 2009 14:25:09 -0700

Hello  -

   I am using Audio Queue with File Streams to do streaming MP3s on
the iPhone. (using

  What I'd like to add now is hard panning.   The audio is one voice
in left channel, another in the right channel.     What you get is
people talking over each other -- not good.


  I tried just copying bytes in the stream from left-> right channel
(assuming interleaved bytes).   But then I realized the data must be
encoded MP3s.


  So then I looked at Audio Units -- the panning unit or the 3d mixer
looks promising.      However, it is unclear to me:  Is their an Audio
Unit chain that already exists where I could just modify the 3dMixer's
values?    Or must I wire up my own Audio Unit graph and handle
writing bytes from the stream to it (replacing my AudioQueue code)?


   Any tips on how to add panning to an http MP3 stream would be very
high appreciated!

Thank you!
Matt
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