相关疑难解决方法(0)

我想将麦克风中的缓冲区读入一个数组，44.1khz 工作正常，但采样率为 8khz 时出现错误

ERROR:    >avae> AVAudioIONodeImpl.mm:884: SetOutputFormat: required condition is false: format.sampleRate == hwFormat.sampleRate
2016-11-26 19:32:40.674 Atem[5800:1168274] *** Terminating app due to uncaught exception 'com.apple.coreaudio.avfaudio', reason: 'required condition is false: format.sampleRate == hwFormat.sampleRate'

使用我的以下代码：

 var engine = AVAudioEngine()
    func setup() {

    print("new")
    let input = engine.inputNode!
    let bus = 0

    let mixer = AVAudioMixerNode()
    engine.attach(mixer)

    engine.connect(input, to: mixer, format: input.outputFormat(forBus: 0))
    //pcmFormatFloat64 -- pcmFormatFloat32
    print(engine.isRunning)
    let fmt = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: 12000, channels: 1, interleaved: true)

    do {
        try …