QML Camera Image Orientation

[i.n.g.o.]

Hi.

I am struggling with the orientation of a photo taken with a QML Camera on Android.
Qt 5.12.2

The image preview is a QML Image with autoTransform:true. When before triggering imageCapture i look up the device orientation with a OrientationSensor and rotate the image (after capture is done) according to the devices orientation:

    function orientationToAngle(orientation, w, h) {
        switch (orientation) {
        case 2: return 180
        case 3: return -90
        case 4: return 90
        }

        return w > h ? -90 : 0;
    }

This works for most of the cases.
But it seems that the Camera and the OrientationSensor have different interpretations of when the Face is up or not.
I end up with 180° rotated previews if i hold my device roughly 30-45° the right side up.

Is there a fool-proof way of getting this right?
There is no Metadata available in the image/the camera.

All i want is a fullscreen camera with image-preview...

thanks for any tips.
ingo

[i.n.g.o.]

i found this in the forum:
https://forum.qt.io/topic/83036/confuse-with-camera-orientation/2

but would not know how to do:
surfaceFormat.scanLineDirection()