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iOS SDK: ExtAudioFileSeek
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iOS SDK: ExtAudioFileSeek

  • Subject: iOS SDK: ExtAudioFileSeek
  • From: Art Gillespie <email@hidden>
  • Date: Mon, 28 Nov 2011 11:50:07 -0700
I'm trying to play a file in reverse using ExtAudioFileSeek and I'm seeing some strange behavior when the file in question is an mp3.

Code here:

https://gist.github.com/1401245

With an LPCM or aac file, the reverse playback sounds as I would expect, but with an mp3 I get some strange behavior. Here's the audio output

http://www.tapsquare.com/art/extaudiofilehatesus/output.wav

I can't find a pattern to the discontinuities, though there does appear to be a weird attenuation (windowing?) just before each bit of zero samples. The only sensible thing I notice is that the behavior is deterministic:  Subsequent passes generate the same discontinuities.

Any suggestions of how to fix this or work around it greatly appreciated.

Thanks,

Art

--
art gillespie
tapsquare, llc
p. 520.344.0902
skype. artgillespie
e. email@hidden

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