[Interest] Cannot map videoforames for QAbstractVideoSurface::present

[Jason H]

How can I get access to pixel data (for reading) when being presented a frame? I have the following:

class VideoSurface: public QAbstractVideoSurface {
bool present(const QVideoFrame &frame) override {
 // I can't map()  because frame is const and map() is not marked const
 // and frame is not already mapped, so what can I do with it?
}
};