Access MIDI from an Audio Server driver plug-in

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Created Apr ’22

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I have an audio box that also supports MIDI, but I can't figure out how to access CoreMIDI services from an Audio Server plug-in.

On calling MIDIClientCreate(), I see the following log:

com.apple.audio.Core-Audio-Driver-Service: (CoreMIDI) [com.apple.coremidi:client]         MIDIClientLib.cpp:258   Couldn't connect to com.apple.midiserver; CoreMIDI will not be usable

I've tried various incantations of the AudioServerPlugIn_MachServices key in the plug-in's Info.plist (per the documentation in AudioServerPlugin.h), but to no avail.

Is there some way to use MIDI from an Audio Server plugin? If no, how should such hardware be supported?

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Answer 1

HighlyExperienced OP

Aug ’22

See https://bradleyross.github.io/ObjectiveC-Examples/Documentation/BRossTools/FunctionalArea.html. It looks like MIDIClientCreate doesn't work right and you have to use MIDIClientCreateWithBlock and my project is in https://github.com/bradleyross/ObjectiveC-Examples in the BRossTools. I would love to talk to people on how to get this working to do more. It appears that some functions have to run in a high-priority thread and others can't run in a high-priority thread.

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