Camera giving duplicate images in iOS 14 and above - ios

Question

class CaptureController: NSObject, AVCapturePhotoCaptureDelegate, AVCaptureVideoDataOutputSampleBufferDelegate {
static let shared = CaptureController()
weak var delegate: CaptureControllerDelegate?
private let session = AVCaptureSession()
private var cameraInput: AVCaptureDeviceInput?
private let photoOutput = AVCapturePhotoOutput()
private let previewVideoOutput = AVCaptureVideoDataOutput()
private let previewRectangleDetectionController = RectangleDetectionController()
var flashMode = AVCaptureDevice.FlashMode.off
override init() {
super.init()
previewVideoOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "video output buffer queue", qos: .userInteractive))
}
func startCaptureSession() {
self.session.sessionPreset = AVCaptureSession.Preset.photo
guard let backCameraDevice = AVCaptureDevice.default(AVCaptureDevice.DeviceType.builtInWideAngleCamera, for: AVMediaType.video, position: .back) else {
assertionFailure("Could not find a back facing camera")
return
}
do {
try cameraInput = AVCaptureDeviceInput(device: backCameraDevice)
guard let cameraInput = cameraInput else { return }
if self.session.canAddInput(cameraInput) {
self.session.addInput(cameraInput)
}
} catch {
print("AVCaptureDeviceInput error: \(error)")
}
if self.session.canAddOutput(self.photoOutput) {
if UIDevice.supportsJPGCaptureFormatOnly() {
self.photoOutput.isHighResolutionCaptureEnabled = false
self.photoOutput.setPreparedPhotoSettingsArray(
[AVCapturePhotoSettings(format: [AVVideoCodecKey: AVVideoCodecType.jpeg])], completionHandler: nil
)
}
self.session.addOutput(self.photoOutput)
}
if self.session.canAddOutput(self.previewVideoOutput) {
self.session.addOutput(self.previewVideoOutput)
if let connection = self.previewVideoOutput.connection(with: .video) {
connection.videoOrientation = .portrait
}
}
self.session.startRunning()
}
func endCaptureSession() {
self.session.outputs.forEach { output in
self.session.removeOutput(output)
}
self.session.inputs.forEach { input in
self.session.removeInput(input)
}
self.session.stopRunning()
}
func takePhoto() {
if UIDevice.supportsJPGCaptureFormatOnly() {
let settings = AVCapturePhotoSettings()
if UIImagePickerController.isFlashAvailable(for: .rear) {
settings.flashMode = flashMode
}
self.photoOutput.capturePhoto(with: settings, delegate: self)
} else {
guard let rawFormatFileType = self.photoOutput.availableRawPhotoFileTypes.first,
let rawFormatPixelType = self.photoOutput.supportedRawPhotoPixelFormatTypes(for: rawFormatFileType).first
else {
print("This device does not support RAW image capture format.")
return
}
guard let processFormat = self.photoOutput.availablePhotoCodecTypes.first else {
print("No supported codecs")
return
}
let settings = AVCapturePhotoSettings(rawPixelFormatType: rawFormatPixelType.uint32Value,
processedFormat: [AVVideoCodecKey: processFormat])
settings.flashMode = flashMode
self.photoOutput.capturePhoto(with: settings, delegate: self)
}
}
// MARK: - AVCapturePhotoCaptureDelegate
func photoOutput(_ output: AVCapturePhotoOutput,
didFinishProcessingRawPhoto rawSampleBuffer: CMSampleBuffer?,
previewPhoto previewPhotoSampleBuffer: CMSampleBuffer?,
resolvedSettings: AVCaptureResolvedPhotoSettings,
bracketSettings: AVCaptureBracketedStillImageSettings?,
error: Error?) {
if let error = error {
print("Capture failed: \(error)")
}
}
func photoOutput(_ output: AVCapturePhotoOutput,
didFinishProcessingPhoto photo: AVCapturePhoto,
error: Error?) {
if let error = error {
print("Capture failed: \(error)")
self.delegate?.captureDidFail()
} else {
DispatchQueue.global(qos: .userInitiated).async {
guard let scannedImage = self.processImage(from: photo, withDetectedRectangle: self.previewRectangleDetectionController.bestRectangle) else {
return
}
self.delegate?.didCaptureImage(scannedImage)
}
}
}
private func processImage(from photo: AVCapturePhoto, withDetectedRectangle detectedRect: DetectedRectangle?) -> ScannedImage? {
guard let imageData = photo.fileDataRepresentation() else { return nil }
guard let image = CIImage(data: imageData) else { return nil }
// the image data always comes landscape oriented from the AVCapturePhoto, but the CIImage doesn't know.
// We have to flip it "right" here to match the expected portrait orientation ("up" would be the typical
// portrait orientation).
let targetOrientation: CGImagePropertyOrientation
if let orientationRawValue = photo.metadata[kCGImagePropertyOrientation as String] as? UInt32,
let photoOrientation = CGImagePropertyOrientation(rawValue: orientationRawValue) {
targetOrientation = photoOrientation
} else {
targetOrientation = .right
}
let rotatedImage = image.oriented(targetOrientation)
guard let flattenedImage = ImageManipulationController.shared.flatten(rotatedImage) else { return nil }
var editingCorners: Quadrilateral?
if let detectedRect = detectedRect {
// match scale
let scaleTransform = ResizingHelpers.transform(from: detectedRect.imageSize, to: flattenedImage.extent.size, destinationContentMode: .scaleToFill)
let scaledRect = detectedRect.rectangle.applying(scaleTransform)
// inset
let insetAmount: CGFloat = 0.97
let insetScale = CGAffineTransform(scaleX: insetAmount, y: insetAmount)
let insetScaledRect = scaledRect.applying(insetScale)
let distanceToCenter = scaledRect.center - insetScaledRect.center
let insetTranslation = CGAffineTransform(translationX: distanceToCenter.x, y: distanceToCenter.y)
let finalInsettingTransform = insetScale.concatenating(insetTranslation)
editingCorners = scaledRect.applying(finalInsettingTransform)
}
return ScannedImage(fullResolutionImage: flattenedImage, editingCorners: editingCorners)
}
// MARK: - AVCaptureVideoDataOutputSampleBufferDelegate
func captureOutput(_ captureOutput: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
guard let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return }
let ciImage = CIImage(cvImageBuffer: imageBuffer)
self.previewRectangleDetectionController.processRectangles(in: ciImage)
let bestRect = self.previewRectangleDetectionController.bestRectangle
self.delegate?.didUpdatePreviewImage(ciImage, withDetectedRectangle: bestRect)
}
}
Above code are working fine in iOS 13 and below. But in iOS 14 and above producing duplicate Image. I tried in internet but no hope to find why it's coming duplicates.
Note: While pressing camera button , its appearing in two images