The DDVIDEOPORTDESC structure is defined as :-

struct DDVIDEOPORTDESC {
DWORD dwSize;
DWORD dwFieldWidth;
DWORD dwVBIWidth;
DWORD dwFieldHeight;
DWORD dwMicrosecondsPerField;
DWORD dwMaxPixelsPerSecond;
DWORD dwVideoPortID;
DWORD dwReserved1;
DDVIDEOPORTCONNECT VideoPortType;
ULONG_PTR dwReserved2;
ULONG_PTR dwReserved3;
};