iOS 10.2上的Swift 3:如何从麦克风订阅单个样本？需要实时处理音频

let audioSession = AVAudioSession.sharedInstance()
do {
    try audioSession.setCategory(.record)
    try audioSession.setActive(true)
} catch {
    print("Failed to set audio session category.")
}

let audioEngine = AVAudioEngine()
let inputNode = audioEngine.inputNode
let format = inputNode.inputFormat(forBus: 0)

inputNode.installTap(onBus: 0, bufferSize: 1024, format: format) { (buffer, time) in
    // 在这里处理音频样本
}

do {
    try audioEngine.start()
} catch {
    print("Failed to start audio engine.")
}