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multichannel, stateful AU; non-interleaved data
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multichannel, stateful AU; non-interleaved data


  • Subject: multichannel, stateful AU; non-interleaved data
  • From: Will Benton <email@hidden>
  • Date: Tue, 7 Dec 2004 21:42:12 -0600

Hello list,

I am interested in writing an AU effect that operates either in mono or on n channels. I will need to allocate some per-channel state (i.e. that persists between process() calls), but my effect does not assume any relationship between the channels. Am I correct in assuming that I can allocate my state buffers in the kernel constructor? (That is, will an effect kernel's process() method always be called with the same number-of-channels parameter?)

Also, it would be extremely convenient if I could operate on non-interleaved data. SampleEffectUnit in the developer tools operates on interleaved data; is there any example code or documentation on how to write an effect that operates on non-interleaved data? (Is this supported by all hosts?) More generally, is the "Audio and MIDI on Mac OS X" from 2001 on Apple's web site the most recent available documentation?

Thanks for your help!





best,
wb

---
Will Benton <email@hidden>
coordinates:  http://www.cs.wisc.edu/~willb/willb.vcf

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