#AudioKit 播放音序器音频 mp3

Posted 2023-02-23

【中文标题】#AudioKit 播放音序器音频 mp3

【英文标题】：#AudioKit Play sequencer audios mp3

【发布时间】：2018-06-12 14:56:56

【问题描述】：

我正在尝试使用 AudioKit 库播放音频 mp3 列表。我阅读了有关音序器的信息，并在官方 AudioKit Doc 的示例中看到了所有代码。 调用方法 sequencer.play() 后没有声音。

  var audios:[String] = [
         "/Users/rubenpalma/Documents/mp3/hola.mp3",
         "/Users/rubenpalma/Documents/mp3/prueba.mp3",
         "/Users/rubenpalma/Documents/mp3/mundo.mp3",
         "/Users/rubenpalma/Documents/mp3/test.mp3",
         "/Users/rubenpalma/Documents/mp3/hi.mp3",
         "/Users/rubenpalma/Documents/mp3/adios.mp3"
         ]


        var path = playAudios(background: back, audiosPath: audios)

func playAudios(background:String,audiosPath:[String]) -> String 

    var durationBackground = 0.00
    let midi = AKMIDI()
    let sequencer = AKSequencer()
    let mixer = AKMixer()
    do
        var i = 0
        for path in audiosPath 
            let fileAudioURL = NSURL(fileURLWithPath: path)
            if let audio = try? AKAudioFile(forReading: fileAudioURL as URL) 
                print("\(path) size:\(audio.duration)")
                let sampler = AKMIDISampler()
                try sampler.loadAudioFile(audio)
                sampler.enableMIDI(midi.client, name: "Sampler_\(i)")

                mixer.connect(input: sampler)

                let track = sequencer.newTrack("t_\(i)")
                track?.setMIDIOutput(sampler.midiIn)
                track?.add(noteNumber: MIDINoteNumber(i), velocity: 127, position: AKDuration(beats:Double(0)), duration: AKDuration(beats:audio.duration*2), channel:1)
                print("is empty? \(track!.isEmpty)")

                durationBackground += audio.duration
                i += 1
            
        
        AudioKit.output = mixer
        try AudioKit.start()
        sequencer.play()

        print("playing.. \(sequencer.isPlaying) ")
    catch
        print("Unexpected non-vending-machine-related error: \(error)")
    
    return "duration  \(durationBackground)"

【参考方案1】：

AKSequencer 用于播放 MIDI 文件。要播放 mp3 文件，您可以使用 AKPlayer http://audiokit.io/docs/Classes/AKPlayer.html