AVCaptureSession with multiple previews

Question

I have an AVCaptureSession running with an AVCaptureVideoPreviewLayer.

I can see the video so I know it\'s working.

However, I\'d like to have a collection v

Answer 1

Working in Swift 5 on iOS 13, I implemented a somewhat simpler version of the answer by @Ushan87. For testing purposes, I dragged a new, small UIImageView on top of my existing AVCaptureVideoPreviewLayer. In the ViewController for that window, I added an IBOutlet for the new view and a variable to describe the correct orientation for the camera being used:

    @IBOutlet var testView: UIImageView!
    private var extOrientation: UIImage.Orientation = .up

I then implemented the AVCaptureVideoDataOutputSampleBufferDelegate as follows:

// MARK: - AVCaptureVideoDataOutputSampleBufferDelegate
extension CameraViewController: AVCaptureVideoDataOutputSampleBufferDelegate {
    func captureOutput(_ captureOutput: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {

        let imageBuffer: CVPixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)!
        let ciimage : CIImage = CIImage(cvPixelBuffer: imageBuffer)
        let image : UIImage = self.convert(cmage: ciimage)

        DispatchQueue.main.sync(execute: {() -> Void in
            testView.image = image
        })

    }

    // Convert CIImage to CGImage
    func convert(cmage:CIImage) -> UIImage
    {
        let context:CIContext = CIContext.init(options: nil)
        let cgImage:CGImage = context.createCGImage(cmage, from: cmage.extent)!
        let image:UIImage = UIImage.init(cgImage: cgImage, scale: 1.0, orientation: extOrientation)
        return image
    }

For my purposes, the performance was fine. I did not notice any lagginess in the new view.