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所以我没有找到任何关于这个问题的代码。我已经录制了一个 mp4 文件（audioFile.mp4），现在我想通过套接字流式传输它，但我在转换时遇到了问题。我知道有 ffmpeg（https://www.ffmpeg.org/）平台，但我没有看到任何代码。任何想法都将不胜感激。

class ViewController: UIViewController {

var requestManager = RequestManager()

var socket: WebSocket?

var audioRecorder: AVAudioRecorder!

@IBOutlet weak var recordBtn: UIButton!

@IBOutlet weak var playBtn: UIButton!

var fileName: String = "audioFile.mp4"

var soundRecorder: AVAudioRecorder?
var soundPlayer: AVAudioPlayer?
var audioSession = AVAudioSession.sharedInstance()

override func viewDidLoad() {
    super.viewDidLoad()
    self.socket?.delegate = self

    setUpRecorder()
    playBtn.isEnabled = false

}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    self.audioSession = AVAudioSession.sharedInstance()

    do {
        try audioSession.setCategory(AVAudioSession.Category.playAndRecord, mode: .measurement, options: .defaultToSpeaker)
        try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
    } catch {
        print(error)
    }
}

func getDocDirector() -> URL {
    let path = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    return path[0]
}

func setUpRecorder() {


    let audioFileName = getDocDirector().appendingPathComponent(fileName)

    let recordSettings: [String: Any] = [AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
                                         AVEncoderAudioQualityKey: AVAudioQuality.max.rawValue,
                                         AVNumberOfChannelsKey: 1,
                                         AVEncoderBitRateKey: 16000,
                                         AVSampleRateKey: 16000]

    do {
        soundRecorder = try AVAudioRecorder(url: audioFileName, settings: recordSettings)
        soundRecorder?.delegate = self
        soundRecorder?.prepareToRecord()
    } catch {
       print(error)
    }
}

func setUpPlayer() {
    let audioFileName = getDocDirector().appendingPathComponent(fileName)
    do {
        soundPlayer = try AVAudioPlayer(contentsOf: audioFileName)
        soundPlayer?.delegate = self
        soundPlayer?.prepareToPlay()
        soundPlayer?.volume = 1.0
    } catch {
        print(error)
    }
}

@IBAction func recordAction(_ sender: Any) {
    if recordBtn.titleLabel?.text == "Record" {
        soundRecorder?.record()
        recordBtn.setTitle("Stop", for: .normal)
        playBtn.isEnabled = false
    } else {
        soundRecorder?.stop()
        recordBtn.setTitle("Record", for: .normal)
        playBtn.isEnabled = false
    }
}

@IBAction func playAction(_ sender: Any) {
    if playBtn.titleLabel?.text == "Play" {
        playBtn.setTitle("Stop", for: .normal)
        recordBtn.isEnabled = false
        setUpPlayer()
        soundPlayer?.play()
    } else {
        playBtn.setTitle("Play", for: .normal)
        recordBtn.isEnabled = false
    }
}

func openSocket() {
    getUrl(success: { [weak self] (url) in
        self?.socket = WebSocket(url: URL(string: url)!)
        self?.socket?.connect()
    }) { (e) in
        //
    }
}
}
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