使用AudioKit从MIDI文件中读取音符 [英] Read note from MIDI file using AudioKit

问题描述

我正在尝试构建一个音序器，以从midi文件中呈现音符.

I am trying to build a sequencer that render the note from midi file.

当前，我正在使用AudioKit进行音乐数据处理.想知道如何使用AudioKit从midi文件中获取音符数据/事件.

Currently I am using AudioKit for the music data processing. Would like to know how can I get the note data / event from the midi file with AudioKit.

我尝试使用AKSequencer并输出到AKMIDINode来监听MIDI事件，但似乎无法从中获取任何信息.

I have tried to use AKSequencer and output to AKMIDINode to listen the MIDI event, but seems cannot get anything from it.

class CustomMIDINode: AKMIDINode {

    override init(node: AKPolyphonicNode) {
        print("Node create") // OK
        super.init(node: node)
    }

    func receivedMIDINoteOff(noteNumber: MIDINoteNumber, velocity: MIDIVelocity, channel: MIDIChannel) {
        print("midi note off") // Not printed
    }

    func receivedMIDISetupChange() {
        print("midi setup changed") // Not printed
    }

    override func receivedMIDINoteOn(_ noteNumber: MIDINoteNumber, velocity: MIDIVelocity, channel: MIDIChannel) {
        print("receivedMIDINoteOn") // Not printed
    }
}

func setupSynth() {
    oscBank.attackDuration = 0.05
    oscBank.decayDuration = 0.1
    oscBank.sustainLevel = 0.1
    oscBank.releaseDuration = 0.1
}


let seq = AKSequencer(filename: "music")
let oscBank = AKOscillatorBank()
var midi = AKMIDI()
let midiNode = CustomMIDINode(node: oscBank)

setupSynth()

midi.openInput()
midi.addListener(midiNode)
seq.tracks.forEach { (track) in
    track.setMIDIOutput(midiNode.midiIn)
}
AudioKit.output = midiNode
AudioKit.start()
seq.play()

推荐答案

您是否看过可供下载的示例音频工具包项目?它们对于AK故障排除非常有用.实际上，与示例文档相比，我发现这些示例更好(因为对实现的解释不是很好).

Have you looked at any of the example Audio Kit projects available for download? they are very useful for troubleshooting AK. I actually find the examples better than the documentation (as implementation isn't explained very well).

对于您的问题，您可以将Midi侦听器添加到事件中，在 Analog Synth X 项目在此处可用.

As for your question you can add a midi listener to an event, there is an example of this code in the Analog Synth X Project available here.

let midi = AKMIDI()
        midi.createVirtualPorts()
        midi.openInput("Session 1")
        midi.addListener(self)

要获取更多工作代码，您可以参阅此尽管部分代码可能已经过时.

For a more worked bit of code you can refer to this although the code is likely out of date in parts.

这篇关于使用AudioKit从MIDI文件中读取音符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！