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Audio Units - "fanout" and buses
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Audio Units - "fanout" and buses


  • Subject: Audio Units - "fanout" and buses
  • From: Marc Poirier <email@hidden>
  • Date: Fri, 26 Jul 2002 13:03:27 -0400

from the AU docs:

The inOutputBusNumber parameter requests that audio be rendered for a particular audio output of the AudioUnit. AudioUnitRenderSlice() must be called separately to get rendered audio for each of its outputs. The AudioUnit is expected to cache its rendered audio for each output in the case that AudioUnitRenderSlice() is called more than once for the same output (inOutputBusNumber is the same) at the same time (inTimeStamp is the same). This solves the "fanout" problem.


What exactly is the "fanout" problem? I'm not familiar with this expression at all. And what exactly is meant in this context when it is said that the output should be "cached?"

And while we're discussing this passage, it reminds me that I can't figure out what the word "bus" is supposed to mean in AudioUnit-speak. Is "bus" another way of saying "channel," as in a stereo audio stream would have a left bus and a right bus, or bus 1 and bus 2? Or is it something else altogether?

Thanks,
Marc

--
[ Destroy FX - http://www.smartelectronix.com/~destroyfx/ ]
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