AudioKit：如何添加V5 Midi侦听器

如何解决AudioKit：如何添加V5 Midi侦听器

看来V5与V4不同。我想插入外部Midi键盘并将事件映射到视觉合成器。以下V4示例产生错误

class MuMidiListener: AKMIDIListener {
    // ... protocol funcs here
}

class MuMidi {

    public static let shared = MuAudio()

    let engine = AKEngine()
    var midi = AKMIDI()
    var listener = MuMidiListener()

    init () {
        midi.openInput()
        midi.addListener(listener)
    }

    public func test() {
        try? engine.start()
    }
}

解决方法

AKEngine（现在为AudioEngine）与Midi输入无关。自2020年9月7日起，最近对V5进行了一些名称更改后，监控Midi输入变得非常简单：

class MuLog {
    static func print(_ icon: String,_ msg: String) {
        Swift.print(icon + ":" + msg,terminator: " ")
    }
}
class MuMidiListener: MIDIListener {

    func note(_ note: MIDINoteNumber,_ velocity: MIDIVelocity) -> String {
        let names = ["C","D♭","D","E♭","E","F","G♭","G","A♭","A","B♭","B"]
        let octave = Int(note / 12)
        let note = Int(note % 12)
        let name = names[note]
        return "\(name)\(octave):\(velocity)"
    }

    func receivedMIDINoteOn(noteNumber: MIDINoteNumber,velocity: MIDIVelocity,channel: MIDIChannel,portID: MIDIUniqueID?,offset: MIDITimeStamp) {

        MuLog.print("♪",note(noteNumber,velocity))

    }

    func receivedMIDINoteOff(noteNumber: MIDINoteNumber,offset: MIDITimeStamp) {

        MuLog.print("∅",velocity))
    }

    func receivedMIDIController(_ controller: MIDIByte,value: MIDIByte,offset: MIDITimeStamp) {

        MuLog.print("?","\(controller):\(value)")
    }

    func receivedMIDIAftertouch(noteNumber: MIDINoteNumber,pressure: MIDIByte,pressure))
    }

    func receivedMIDIAftertouch(_ pressure: MIDIByte,offset: MIDITimeStamp) {
        MuLog.print("?","\(channel):\(pressure)")
    }

    func receivedMIDIPitchWheel(_ pitchWheelValue: MIDIWord,offset: MIDITimeStamp) {
        MuLog.print("◯","\(channel):\(pitchWheelValue)")
    }

    func receivedMIDIProgramChange(_ program: MIDIByte,offset: MIDITimeStamp) {
        MuLog.print("⚙️","\(channel):\(program)")
    }

    func receivedMIDISystemCommand(_ data: [MIDIByte],offset: MIDITimeStamp) {
        MuLog.print("SysX","\(data)")
    }
    func receivedMIDISetupChange() {
    }

    func receivedMIDIPropertyChange(propertyChangeInfo: MIDIObjectPropertyChangeNotification) {
    }

    func receivedMIDINotification(notification: MIDINotification) {
    }
}

class MuMidi {

    public static let shared = MuMidi()

    public func test() {
        let midi = MIDI.sharedInstance
        let listener = MuMidiListener()
        midi.openInput()
        midi.addListener(listener)
    }
}