如何使用 Audiokit 发送 MIDI 多边形压力消息?

Question

目前我正在构建一个应用程序，它基本上是我的病毒 TI 合成器的合成器控制器。病毒允许使用 MIDI CC 消息设置其大部分参数。 使用Audiokit非常简单：

midiOutput.sendEvent(AKMIDIEvent(controllerChange: 17, value: SomeValue, channel: 1))

但是，某些参数需要使用"聚乙烯压力"消息进行设置。 每个音符都映射到某个参数，压力值将用于设置参数。这看起来像一个黑客，但它就是这样。

我的问题是现在我找不到发送 midi 多边形压力消息的方法，因为它们似乎在 audiokit 中不可用。(换句话说：没有多压力事件类型(

问题：有没有办法使用 audiokit 发送多晶压力消息？例如，是否可以自己构造新的消息类型？

Answer 1

发送消息 触后(通道压力、多压力( AudioKit 使用基于十六进制转换的函数。不幸的是，在有关这些功能的官方文档中几乎没有任何信息。

// POLYPRESSURE
// Use this code to get polypressure messages from your MIDI keyboard.
func receivedMIDIAfterTouch(_ pressure: MIDIByte, channel: MIDIChannel) {
// do something
}

// Use this code to send your polypressure messages to the MIDI output of your application.
func sendPolyPressureData(channel: MIDIChannel, noteNumber: MIDINoteNumber, value: MIDIByte) {
let noteCommand: MIDIByte = MIDIByte(0xA0) + channel
let message: [MIDIByte] = [noteCommand, noteNumber, value]
let event = AKMIDIEvent(data: message)
midi.sendEvent(event)
}

好吧，最后我将在此答案中添加更多类似的 AudioKit MIDI 函数，文档中对此描述得太少。

// CHANNEL PRESSURE
func receivedMIDIAftertouch(noteNumber: MIDINoteNumber,
pressure: MIDIByte,
channel: MIDIChannel) {
// do something
}
func sendChannelPressureData(channel: MIDIChannel, value: MIDIByte) {
let command: MIDIByte = MIDIByte(0xD0) + channel
let message: [MIDIByte] = [command,  value, 0]
let event = AKMIDIEvent(data: message)
midi.sendEvent(event)
}


// CONTROLL CHANGE  &  MODULATION (СС_0)
func receivedMIDIController(_ controller: MIDIByte, value: MIDIByte, channel: MIDIChannel) {
// do something
}
func ccOut (channel: MIDIChannel, cc: MIDIByte, value: MIDIByte) {
let event = AKMIDIEvent(controllerChange: cc, value: value, channel: channel)
midi.sendEvent(event)
}


// PITCH BAND
func receivedMIDIPitchWheel(_ pitchWheelValue: MIDIWord, channel: MIDIChannel) {
// do something
}

/// Send a pitch bend message.
/// - Parameters:
///   - value: Value of pitch shifting between 0 and 16383. Send 8192 for no pitch bending.
///   - channel: Channel you want to send pitch bend message. Defaults 0.
func sendPitchBendData(channel: MIDIChannel, value: UInt16) {
let pitchCommand = MIDIByte(0xE0) + channel
let mask: UInt16 = 0x007F
let byte1 = MIDIByte(value & mask) // MSB, bit shift right 7
let byte2 = MIDIByte((value & (mask << 7)) >> 7) // LSB, mask of 127
let message: [MIDIByte] = [pitchCommand, byte1, byte2]
let event = AKMIDIEvent(data: message)
midi.sendEvent(event)
}