UIImageOrientation 与相机

Posted 2023-03-14

【中文标题】UIImageOrientation 与相机

【英文标题】：UIImageOrientation with camera

【发布时间】：2017-02-01 06:46:18

【问题描述】：

这是我相机的代码，把前置摄像头换成后置摄像头，如果我用后置摄像头拍照，照片的方向是好的（原始），但如果我用前置摄像头拍照相机获取方向错误的图像。

class TakeSelfieViewController: UIViewController, AVCapturePhotoCaptureDelegate 

var captureSession = AVCaptureSession()
var photoOutput = AVCapturePhotoOutput()
var previewLayer : AVCaptureVideoPreviewLayer?
var captureDevice : AVCaptureDevice?

var sessionOutputSetting = AVCapturePhotoSettings(format: [AVVideoCodecKey:AVVideoCodecJPEG])

var toggle = false

@IBOutlet weak var cameraView: UIView!
@IBOutlet weak var tempImageView: UIImageView!
@IBOutlet weak var adorButton: UIButton!

override func viewDidAppear(_ animated: Bool) 
    super.viewDidAppear(animated)
    previewLayer?.frame = cameraView.bounds

    let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.light)
    let blurEffectView = UIVisualEffectView(effect: blurEffect)
    blurEffectView.frame = adorButton.bounds
    blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
    adorButton.addSubview(blurEffectView)



override func viewWillAppear(_ animated: Bool) 
    super.viewWillAppear(animated)

    pickCamera(which: toggle)



func pickCamera(which: Bool) 

    if (which == true) 

        let deviceDescovery = AVCaptureDeviceDiscoverySession(deviceTypes: [AVCaptureDeviceType.builtInDualCamera, AVCaptureDeviceType.builtInTelephotoCamera,AVCaptureDeviceType.builtInWideAngleCamera], mediaType: AVMediaTypeVideo, position: AVCaptureDevicePosition.back)

        print("back camera")

        startCamera(deviceDesc: deviceDescovery!)

        toggle = true

     else if (which == false) 

        let deviceDescovery = AVCaptureDeviceDiscoverySession(deviceTypes: [AVCaptureDeviceType.builtInDualCamera, AVCaptureDeviceType.builtInTelephotoCamera,AVCaptureDeviceType.builtInWideAngleCamera], mediaType: AVMediaTypeVideo, position: AVCaptureDevicePosition.front)

        print("front camera")

        startCamera(deviceDesc: deviceDescovery!)

        toggle = false

    




func startCamera(deviceDesc: AVCaptureDeviceDiscoverySession!) 

    for device in (deviceDesc.devices)! 


        if device.position == AVCaptureDevicePosition.back 

            do 

                let input = try AVCaptureDeviceInput(device: device)
                if captureSession.canAddInput(input) 
                    captureSession.addInput(input)

                    if captureSession.canAddOutput(photoOutput) 
                        captureSession.addOutput(photoOutput)


                        previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                        previewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
                        previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait


                        cameraView.layer.addSublayer(previewLayer!)
                        captureSession.startRunning()
                        print("ADD Back")

                     else  print("Cannot add input - back") 

                

             catch 

                print("Error")

            

         else if (device.position == AVCaptureDevicePosition.front) 

            do 

                let input = try AVCaptureDeviceInput(device: device)
                print(input)
                if captureSession.canAddInput(input) 

                    captureSession.addInput(input)

                    if captureSession.canAddOutput(photoOutput) 
                        captureSession.addOutput(photoOutput)


                        previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                        previewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
                        previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait


                        cameraView.layer.addSublayer(previewLayer!)
                        captureSession.startRunning()
                        print("ADD Front")

                

                 else  print("Cannot add input - front") 

             catch 

                print(error)

            
        
    


func didPressTakePhoto() 
    if let videoConnection = photoOutput.connection(withMediaType: AVMediaTypeVideo) 
        videoConnection.videoOrientation = AVCaptureVideoOrientation.portrait
        let settings = AVCapturePhotoSettings(format: [AVVideoCodecKey : AVVideoCodecJPEG])
        photoOutput.capturePhoto(with: settings, delegate: self)

    


func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) 

    let imageData = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: photoSampleBuffer!, previewPhotoSampleBuffer: previewPhotoSampleBuffer)
    let dataProvider = CGDataProvider(data: imageData as! CFData)
    let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: CGColorRenderingIntent.defaultIntent)

    let image = UIImage(cgImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.right)
    self.tempImageView.image = image
    self.tempImageView.isHidden = false
    self.yellowButton.isHidden = true
    self.toggleAction.isHidden = true
    self.adorButton.isHidden = true
    print("Hola")


var didTakePhoto = Bool()

@IBOutlet weak var yellowButton: UIButton!
@IBOutlet weak var toggleAction: UIButton!

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) 
    if didTakePhoto 
        tempImageView.isHidden = true
        yellowButton.isHidden = false
        toggleAction.isHidden = false
        adorButton.isHidden = false
        didTakePhoto = false
        print("????")

    


@IBAction func yellowPressed(_ sender: UIButton) 
    captureSession.startRunning()
    didTakePhoto = true
    didPressTakePhoto()
    print("????")


@IBAction func toggleCamera(_ sender: Any) 

    if (toggle == false) 

        print("Changing to back camera")

        let currentCameraInput: AVCaptureInput = captureSession.inputs[0] as! AVCaptureInput

        captureSession.removeInput(currentCameraInput)

        toggle = true

        pickCamera(which: toggle)

     else if (toggle == true) 

        print("Changing to front camera")

        let currentCameraInput: AVCaptureInput = captureSession.inputs[0] as! AVCaptureInput

        captureSession.removeInput(currentCameraInput)

        toggle = false

        pickCamera(which: toggle)

    



override var prefersStatusBarHidden: Bool 

    return true

我该如何解决这个问题？ ????

【参考方案1】：

使用前置摄像头拍摄的图像是镜像的，当您拍照时，图像方向是在它的 EXIF 字典中获取的，或者在元数据字典中传递。

大多数情况下，当您将其作为 JPG 或 PNG 传递时，如果您不直接处理它，则不会考虑此值。 如果您在风景中拍照，您应该会遇到类似的问题。

在您的捕获方法中，您似乎在应该处理时将方向强制为固定值。

【讨论】：

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