How to know if images and video frames scanlines are bottom up or top down?

[Cyrille de Brebisson]

hello,

My app modifies video frames on the fly (qml filters) using the following code:

QVideoFrame CBScopeVirtualCouderRunnable::run(QVideoFrame *inputframe, const  QVideoSurfaceFormat &surfaceFormat, RunFlags flags)
{
    inputframe->map(QAbstractVideoBuffer::ReadOnly);
    QImage tempImage=qt_imageFromVideoFrame(*inputframe);
    ... do something with image bits
    inputframe->unmap();
    QVideoFrame outputFrame= QVideoFrame(tempImage);
    return outputFrame;
}

Problem... on some computers, the image bits (comming from the webcam) are first line first, on others, it is last line first.
How can I detect whichcase I am in?

Thanks,
Cyrille

[SGaist]

Hi,

Do you know what image type these two different camera delivers ?

[Cyrille de Brebisson]

hello,

no, one is on windows, the other on mac... i have not tried other os yet...

how would i check the image type?

cyrille