WM_CAP_GET_VIDEOFORMAT
The
WM_CAP_GET_VIDEOFORMAT message retrieves a copy of the video format in use or
the size required for the video format. You can send this message explicitly or
by using the capGetVideoFormat and capGetVideoFormatSize macros.
WM_CAP_GET_VIDEOFORMAT
wParam = (WPARAM) (wSize);
lParam = (LPARAM) (LPVOID) (psVideoFormat);
Parameters
wSize
Size, in
bytes, of the structure referenced by s.
psVideoFormat
Address of a BITMAPINFO structure. You can also
specify NULL to retrieve the number of bytes needed by BITMAPINFO.
Return Values
Returns the
size, in bytes, of the video format or zero if the capture window is not
connected to a capture driver. For video formats that require a palette, the
current palette is also returned.
Remarks
Because
compressed video formats vary in size requirements applications must first
retrieve the size, then allocate memory, and finally request the video format
data.
See Also