从同一个 AVCaptureSession 拍摄视频和照片时应用程序崩溃？

Posted 2023-02-25

【中文标题】从同一个 AVCaptureSession 拍摄视频和照片时应用程序崩溃？

【英文标题】：App crashing while taking both video and photo from same AVCaptureSession?

【发布时间】：2018-09-04 07:19:13

【问题描述】：

我正在尝试使用 AVFoundation 使用相同的 AVCaptureSession 制作一个包含音频、视频和照片的应用程序。

以下是我如何设置相机和捕获会话。

func setUpCaptureSession()
    captureSession.sessionPreset = AVCaptureSession.Preset.photo


func setUpDevice()
    let deviceDiscoverSession = AVCaptureDevice.DiscoverySession(deviceTypes: [AVCaptureDevice.DeviceType.builtInWideAngleCamera], mediaType: AVMediaType.video, position: AVCaptureDevice.Position.unspecified)
    let devices = deviceDiscoverSession.devices
    for device in devices
        if device.position == AVCaptureDevice.Position.back
            backCamera = device
        else
            frontCamera = device
        
    

    currentCamera = backCamera


func setUpInputOutput()
    do
        let captureDeviceInput = try AVCaptureDeviceInput(device: currentCamera!)
        captureSession.addInput(captureDeviceInput)

        photoOutput = AVCapturePhotoOutput()
        photoOutput?.isHighResolutionCaptureEnabled = true
        self.captureSession.addOutput(photoOutput!)

        if #available(ios 11.0, *) 
            photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format: [AVVideoCodecKey : AVVideoCodecType.jpeg])], completionHandler: nil)
         else 
            // Fallback on earlier versions
            photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format: [AVVideoCodecKey: AVVideoCodecJPEG])], completionHandler: nil)
        
    catch
        print(error)
    


func setUpPreviewLayer()
    cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
    cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
    cameraPreviewLayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
    cameraPreviewLayer?.frame = self.cameraView.frame
    self.cameraView.layer.insertSublayer(cameraPreviewLayer!, at: 0)


func startRunningCaptureSession()
    captureSession.startRunning()

    //Session starts with camera as default so set it to gesture
    let doubleTap = UITapGestureRecognizer(target: self, action: #selector(takePhoto(sender:)))
    doubleTap.numberOfTapsRequired = 2
    self.view.addGestureRecognizer(doubleTap)

要从相机拍照（正在工作，照片存储在图库中），我做了以下操作：

@objc func cameraAction(sender: UIButton)

    if(imageSetAction())
        cameraImage.image = UIImage(named: "photo")
        cameraLabel.textColor = ConstantColors.selectedTextColor
        currentSelected = sender.tag

        let doubleTap = UITapGestureRecognizer(target: self, action: #selector(takePhoto(sender:)))
        doubleTap.numberOfTapsRequired = 2
        self.view.addGestureRecognizer(doubleTap)
    



@objc func takePhoto(sender: Any)

    guard let capturePhotoOutput = self.photoOutput else 
        return
    
    let photoSettings = AVCapturePhotoSettings()
    photoSettings.isAutoStillImageStabilizationEnabled = true
    photoSettings.isHighResolutionPhotoEnabled = true
    photoSettings.flashMode = .auto
    capturePhotoOutput.capturePhoto(with: photoSettings, delegate: self)



func photoOutput(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhoto photoSampleBuffer: CMSampleBuffer?, previewPhoto previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) 

    guard error == nil,
        let photoSampleBuffer = photoSampleBuffer else 
            print("Error capturing photo: \(String(describing: error))")
            return
    

    guard let imageData =
        AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: photoSampleBuffer, previewPhotoSampleBuffer: previewPhotoSampleBuffer) else 
            return
    

    let capturedImage = UIImage.init(data: imageData , scale: 1.0)
    if let image = capturedImage 
        //UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
        let vc = UIStoryboard.init(name: "ImageEdit", bundle: Bundle.main).instantiateViewController(withIdentifier: "imageEdit") as? ImageEdit
        vc?.imagetoEdit = image
        self.navigationController?.pushViewController(vc!, animated: true)

    

但是当我尝试从同一个捕获会话中拍照时，我收到错误“NSInvalidArgumentException”，原因：'*** -[AVCaptureMovieFileOutput startRecordingToOutputFileURL:recordingDelegate:] No active/enabled connections'”。下面是我尝试做的代码。

    func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) 
    print("completed")



@objc func videoAction(sender: UIButton)

    if(imageSetAction())
        videoImage.image = UIImage(named: "video")
        videoLabel.textColor = ConstantColors.selectedTextColor
        currentSelected = sender.tag

        captureSession.removeOutput(photoOutput!)

        self.movieFileOutput = AVCaptureMovieFileOutput()
        self.captureSession.addOutput(movieFileOutput!)

        let longPressGesture = UILongPressGestureRecognizer.init(target: self, action: #selector(handleLongPress))
        self.view.addGestureRecognizer(longPressGesture);
    


@objc func handleLongPress(gestureRecognizer: UILongPressGestureRecognizer) 

    if gestureRecognizer.state == UIGestureRecognizerState.began 
        debugPrint("long press started")
        let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] as URL
        let filePath = documentsURL.appendingPathComponent("tempMovie.mp4")
        if FileManager.default.fileExists(atPath: filePath.absoluteString) 
            do 
                try FileManager.default.removeItem(at: filePath)
            
            catch 
                // exception while deleting old cached file
                // ignore error if any
            
        
        movieFileOutput?.startRecording(to: filePath, recordingDelegate: self)
    
    else if gestureRecognizer.state == UIGestureRecognizerState.ended 
        debugPrint("longpress ended")
        movieFileOutput?.stopRecording()
    

感谢您对此提供任何帮助。

【参考方案1】：

您可以尝试像这样更改 videoAction 中的预设

captureSession.sessionPreset = AVCaptureSessionPresetHigh

你可以在这里看到类似的问题 AVCaptureMovieFileOutput - no active/enabled connections