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AUAudioFilePlayer
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AUAudioFilePlayer


  • Subject: AUAudioFilePlayer
  • From: Christopher Ashworth <email@hidden>
  • Date: Sun, 23 Dec 2007 16:29:30 -0500

Hi all,

I'm looking at rewriting my application to use AUAudioFilePlayer in place of my own file playing class.

I have a few questions about its behavior:

- If frames are dropped during playback, does AUAudioFilePlayer guarantee that later frames are synchronized with what should have been their proper playback time, or does the "sample-accurate timing" only apply to the first scheduled sample? Another way of putting this is: Does AUAudioFilePlayer pause or skip when it can't keep up?

- Related to above: If I have a number of separate AUGraphs, each with an AUAudioFilePlayer, and I schedule each to start at the same host time, will this effectively provide guaranteed sample-accurate sync across all the AUGraphs?

- mStartFrame / mFramesToPlay: If the AUAudioFilePlayer performs sample rate conversion to match the audio file to the unit's output rate, what is the "coordinate system" of these properties? Both in file frames? Both in output frames?

Thanks very much!

Chris
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