如何将音频流 URL 设置为 AVAudioFile？

Question

我正在关注本教程：https : //miguesaldana.me/2017/03/13/how-to-create-a-soundcloud-like-waveform-in-swift-3/

我的代码如下。有一个例外：

错误域=com.apple.coreaudio.avfaudio Code=2003334207 “(null)” UserInfo={failed call=ExtAudioFileOpenURL((CFURLRef)fileURL, &_extAudioFile)}

   let file = try! AVAudioFile(forReading: AudioLink)  //Got Exception Here

    let format = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: file.fileFormat.sampleRate, channels: file.fileFormat.channelCount, interleaved: false)
    print(file.fileFormat.channelCount)
    let buf = AVAudioPCMBuffer(pcmFormat: format!, frameCapacity: UInt32(file.length))
    try! file.read(into: buf!)



    //     print("floatArray \(readFile.arrayFloatValues)\n")
    //self.waveFormView.setNeedsDisplay()