Ios 录制 Live mic 数据无法录制和发送？

Question

import UIKit
import AVFoundation

class RecViewController: UIViewController,AVCaptureAudioDataOutputSampleBufferDelegate {

    @IBOutlet weak var recBtn: UIButton!

    let session = AVCaptureSession()
    var result: NSData?

    override func viewDidLoad() {
        super.viewDidLoad()

        self.recBtn.setTitle("RECORDING", for: .normal)
    }

    @IBAction func recBtnAction(_ sender: Any) {

        session.sessionPreset = .medium

        let mic = AVCaptureDevice.default(for: .audio)
        var mic_input: AVCaptureDeviceInput!

        let audio_output = AVCaptureAudioDataOutput()
        audio_output.setSampleBufferDelegate(self, queue: DispatchQueue.main)

        do {
            mic_input = try AVCaptureDeviceInput(device: mic!)
        } catch {
            return
        }

        if session.inputs.isEmpty {
            self.session.addInput(mic_input)
            session.addOutput(audio_output)
        }

        session.startRunning()

    }
    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {

        let block = CMSampleBufferGetDataBuffer(sampleBuffer)
        var length = 0
        var data: UnsafeMutablePointer<Int8>? = nil

        var status = CMBlockBufferGetDataPointer(block!, 0, nil, &length, &data)    // TODO: check for errors

        result = NSData(bytesNoCopy: data!, length: length, freeWhenDone: false)
    }

    @IBAction func playBtnAction(_ sender: Any) {
        // Storing the ns data and trying to play with following code but it dosent play cant hear a thing
        do {
            let audioPlayer = try AVAudioPlayer(data: result as! Data )
            audioPlayer.prepareToPlay()
            audioPlayer.play()
        } catch {
            print("Error")
        }
    }

}

我正在使用这段代码记录来自麦克风的实时数据，但是当我按下 rec 按钮时没有任何反应，它既没有记录也没有去委托(delegate)和打印那么如何解决这个问题？ (已解决)

我已经更新了代码，当我尝试通过 av 音频播放器播放该 ns 数据时，它没有播放任何内容如何解决这个问题？

Answer 1

看起来您的 audio_output 实际上并没有被 recBtnAction 方法范围之外的任何内容保留。很可能您的 session 在您离开该方法时已被丢弃，因此不会为您捕获任何内容。

---

编辑

玩过您提供的示例代码后，您的实际问题似乎是您使用的委托(delegate)方法的签名错误。

应该是:

func captureOutput(_ output: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!) {
}