如何使用AVAudioEngine同时录制多个麦克风

import AVFoundation

let audioEngine = AVAudioEngine()

let inputNode = audioEngine.inputNode

let audioFile = try! AVAudioFile(forWriting: audioFileURL, settings: inputNode.outputFormat(forBus: 0).settings)

let inputFormat = inputNode.inputFormat(forBus: 0)
inputNode.installTap(onBus: 0, bufferSize: 1024, format: inputFormat) { (buffer, time) in
    do {
        try self.audioFile?.write(from: buffer)
    } catch {
        print("Error writing audio buffer: \(error)")
    }
}

try! audioEngine.start()

audioEngine.stop()
inputNode.removeTap(onBus: 0)