Quick Tip: CameraKit Output -> UIImage
Hi y'all,
A useful function for CameraKit might be to grab the AR View and convert it into an Image imagining you might want to do something like create an image gallery, generate a GIF, or do an image operation of some kind. Following the same protocol structure as PhotoCapture and Record, here's how to get an Image out of CameraKit.
Create a new class somewhere as follows:
class CameraKitOutputToImage: NSObject, Output, OutputRequiringPixelBuffer, SCCameraKitOutputRequiringPixelBufferDelegate {
var view: UIViewController;
var currentlyRequiresPixelBuffer: Bool
var delegate: SCCameraKitOutputRequiringPixelBufferDelegate?
func outputChangedRequirements(_ output: OutputRequiringPixelBuffer) {
}
func cameraKit(_ cameraKit: CameraKitProtocol, didOutputTexture texture: Texture) {
}
func cameraKit(_ cameraKit: CameraKitProtocol, didOutputVideoSampleBuffer sampleBuffer: CMSampleBuffer) {
var image = sampleBuffer.image()
}
func cameraKit(_ cameraKit: CameraKitProtocol, didOutputAudioSampleBuffer sampleBuffer: CMSampleBuffer) {
}
init () {
self.currentlyRequiresPixelBuffer = true;
super.init();
}
}
The gist is we're creating a new output with currentlyRequiresPixelBuffer ON meaning we'll receive frames as sampleBuffer in func cameraKit(_ cameraKit: CameraKitProtocol, didOutputVideoSampleBuffer sampleBuffer: CMSampleBuffer)
We then need to convert CMSampleBuffer to UIImage which we can do by creating an extension for CMSampleBuffer as follows:
extension CMSampleBuffer {
/// https://stackoverflow.com/questions/15726761/make-an-uiimage-from-a-cmsamplebuffer
func image(orientation: UIImage.Orientation = .up, scale: CGFloat = 1.0) -> UIImage? {
if let buffer = CMSampleBufferGetImageBuffer(self) {
let ciImage = CIImage(cvPixelBuffer: buffer)
return UIImage(ciImage: ciImage, scale: scale, orientation: orientation)
}
return nil
}
func imageWithCGImage(orientation: UIImage.Orientation = .up, scale: CGFloat = 1.0) -> UIImage? {
if let buffer = CMSampleBufferGetImageBuffer(self) {
let ciImage = CIImage(cvPixelBuffer: buffer)
let context = CIContext(options: nil)
guard let cg = context.createCGImage(ciImage, from: ciImage.extent) else {
return nil
}
return UIImage(cgImage: cg, scale: scale, orientation: orientation)
}
return nil
}
}
Then we use cameraKit's add(output:) to add our new class as an output.
let cameraFrame = CameraKitOutputToImage(); cameraKit.add(output: cameraFrame);
With everything together you should start to receive UIImage's to do whatever you want with! Hope this helps.
