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Mono Channel ASBD and Audio Units
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Mono Channel ASBD and Audio Units


  • Subject: Mono Channel ASBD and Audio Units
  • From: Benjamin Rindt <email@hidden>
  • Date: Mon, 04 Nov 2013 20:48:11 +0100

Hey guys,

I’m kinda thinking, are mono ASBD’s even used? even in AULab when you create a Mono Input you get 2 meters.

Im currently setting up a matrix mixer which gives out either mono channels or stereo channels (mChannelsPerFrame = 1 or 2)

Works fine, but now I wanted to put an AudioUnit behind a mono output of the mixer and I can’t set a Streamformat of 1 mChannelsPerFrame to the AudioUnits then I am thinking is this even used as 1 = mChannelsPerFrame? It would be no problem to handle the „always 2 channels per frame“ thing if its the normal way it is getting handled but I don’t know how an AU could know its now getting Mono or Stereo? Or can I somehow tell the AU this information?

when I add Voxengo’s „SPAN“ in AULab it says stereo, nut the meter is mono which is cool. In Logic, it says mono and its a mono meter whats even better.

But if I add an AU in my graph its always taking 2 channels and never 1. I can’t set the property its after initializing 2 again.

Thanks for any help I am not really sure if there is „real“ mono in CoreAudio or if its always stereo(or 2 channel connections), this would make sense in many aspecs but in many not.

-Benjamin
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