IAA MIDI in Swift

gistfile1.txt

// in ViewDidLoad in ParentViewController.Swift

 // IAA MIDI
        var callbackStruct = AudioOutputUnitMIDICallbacks(
            userData: nil,
            MIDIEventProc: {
                (first, status, data1, data2, offset) in
                AudioKit.midi.sendMessage([MIDIByte(status), MIDIByte(data1), MIDIByte(data2)])},
            MIDISysExProc: {
                (firstPointer, secondPinter, anotherInt32) in
                print("Not handling sysex")}
        )
        
        let connectIAAMDI = AudioUnitSetProperty(AudioKit.engine.outputNode.audioUnit!,
                                                 kAudioOutputUnitProperty_MIDICallbacks,
                                                 kAudioUnitScope_Global,
                                                 0,
                                                 &callbackStruct,
                                                 UInt32(MemoryLayout<AudioOutputUnitMIDICallbacks>.size))
        if connectIAAMDI != 0 {
            AKLog("Something bad happened")
        }
        
        // Setup AudioBus MIDI Input
        setupAudioBusInput()
        startObservingInterAppAudioConnections()