我在一个类上使用AudioKit的AKMIDIListener协议(protocol)来监听MIDI消息。对于Note On之类的标准消息,此方法工作正常,但SysEx消息未通过。

func receivedMIDINoteOn(noteNumber: MIDINoteNumber, velocity: MIDIVelocity, channel: MIDIChannel) {
    NSLog("Note On \(noteNumber), \(velocity), \(channel)") // works perfectly
}
func receivedMIDISystemCommand(_ data: [MIDIByte]) {
    NSLog("SysEx \(data)") // never triggers

    // More code to handle the messages...
}

SysEx消息是从外部硬件或测试软件发送的。我已经使用MIDI监视应用程序来确保消息正确发送,但是在我的应用程序中它们没有触发receivedMIDISystemCommand

是否需要其他步骤来接收缺少的SysEx消息?

在此先感谢您提供任何线索。

最佳答案

编辑:感谢您提请我们注意。 SysEx接收问题现已在AudioKit的开发分支中得到解决:https://github.com/AudioKit/AudioKit/pull/1017

--

代替

NSLog("SysEx \(data)")

你有没有尝试过?
if let sysExCommand = AKMIDISystemCommand(rawValue: data[0]) {
   print("MIDI System Command: \(sysExCommand)")
}

AKMIDISystemCommand会将您的SysEx数据转换为更有用的数据,其定义如下:
public enum AKMIDISystemCommand: MIDIByte {
    /// Trivial Case of None
    case none = 0
    /// System Exclusive
    case sysex = 240
    /// Song Position
    case songPosition = 242
    /// Song Selection
    case songSelect = 243
    /// Request Tune
    case tuneRequest = 246
    /// End System Exclusive
    case sysexEnd = 247
    /// Clock
    case clock = 248
    /// Start
    case start = 250
    /// Continue
    case `continue` = 251
    /// Stop
    case stop = 252
    /// Active Sensing
    case activeSensing = 254
    /// System Reset
    case sysReset = 255
}

-马修@ Audiokit

10-08 05:10