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Communicate with AudioUnit from C program?
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Communicate with AudioUnit from C program?


  • Subject: Communicate with AudioUnit from C program?
  • From: Igor Clark <email@hidden>
  • Date: Fri, 30 Mar 2018 14:10:41 +0100

Hi all,

Is it possible to load an existing AudioUnit MIDI plugin and interact it with it from a CLI program written in C? I'd like to be able to use commercial plug-ins in my MIDI processing app.

I'm comfortable with how to communicate between C & C++ using 'extern' etc, so that's not the main issue. Rather, I'm wondering whether it's possible to have a C CLI app that loads the AU and sends MIDI passages to it, so that the AU processes the data (ideally async) and then returns its result back to the C app. I guess it's effectively writing an AU host app, but does that all have to be done in Xcode, or is it possible to do it as a straight C/C++ program using clang/llvm at the shell?

Also, the AU Hosting Guide docs <https://developer.apple.com/library/content/documentation/MusicAudio/Conceptual/AudioUnitHostingGuide_iOS/Introduction/Introduction.html> talk about I/O, Mixer and Effect units - is there any other material that focuses on how to do MIDI in AU? Or is a adaptor/translator layer necessary?

Thanks for any pointers,
Igor
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