我有一个IOS应用程序,该应用程序使用AudioKit播放与Pad相关的声音的AudioFiles。因此,我希望该应用程序支持MIDI文件。我想知道如何使用MIDI导出这些声音文件,以便在Garage band这类应用程序中播放
答案 0 :(得分:1)
发送MIDI:
// to send between app, create a virtual port:
AudioKit.midi.createVirtualOutputPort()
// you can specify which outputs you want to open, or open all by default:
AudioKit.midi.openOutput()
// to send a noteOn message:
AudioKit.midi.sendNoteOnMessage(noteNumber: aNoteNumber, velocity: aVelocity)
// to send a noteOff message:
AudioKit.midi.sendNoteOffMessage(noteNumber: aNoteNumber, velocity: 0)
要接收MIDI,您需要具有一个实现AKMIDIListener
协议的类(它甚至可以是您的ViewController,但可能不应该是)。此类可让您实现receivedMIDINoteOn
之类的方法来处理传入事件。
class ClassThatImplementsMIDIListener: AKMIDIListener {
func receivedMIDINoteOn(noteNumber: MIDINoteNumber,
velocity: MIDIVelocity,
channel: MIDIChannel) {
// handle the MIDI event in your app, e.g., trigger you sound file
}
}
设置起来很容易:
// if you want to receive midi from other apps, create a virtual in
AudioKit.midi.createVirtualInputPort()
// you can specify which inputs you want to open, or open them all by default
AudioKit.midi.openInput()
// add your listener
AudioKit.midi.addListener(classImplementingMIDIListener)