The DDVIDEOPORTINFO structure is defined as :-

struct DDVIDEOPORTINFO {
DWORD dwSize;
DWORD dwOriginX;
DWORD dwOriginY;
DWORD dwVPFlags;
RECT rCrop;
DWORD dwPrescaleWidth;
DWORD dwPrescaleHeight;
LPDDPIXELFORMAT lpddpfInputFormat;
LPDDPIXELFORMAT lpddpfVBIInputFormat;
LPDDPIXELFORMAT lpddpfVBIOutputFormat;
DWORD dwVBIHeight;
ULONG_PTR dwReserved1;
ULONG_PTR dwReserved2;
};