Camera rotation angles in AVFoundation

I recently worked with AVFoundation camera and used AVCaptureDevice.RotationCoordinator to sync device rotation to video preview layer. That was straight forward but the problem was ouput sampleBuffer was not rotated.

So, for frame processing purposes I rotated the sampleBuffer with below function.

private func cgImageOrientation(from rotationAngle: CGFloat) -> CGImagePropertyOrientation {
    switch rotationAngle {
    case 0: return isFrontCamera ? .upMirrored : .up
    case 90: return isFrontCamera ? .rightMirrored : .right
    case 180: return isFrontCamera ? .downMirrored : .down
    case 270: return isFrontCamera ? .leftMirrored : .left
    default: return isFrontCamera ? .upMirrored : .up
    }
}

This are just notes for angles I observed and so far got successfull results. (Probably it is device specific so I would like to find a more general way of dealing with this ...)

Model	Device orientation	Camera position	Preview Layer Connection Angle	Camera	func cgImageOrientation result	ok?
iPad (A16)	landscape	top	180	front	downMirrored	ok
	portrait	right	90	front	rightMirrored	ok
	landscape	bottom	0	front	upMirrored	ok
	portrait	left	270	front	leftMirrored	ok