capGetVideoFormat macro (vfw.h)

The capGetVideoFormat macro retrieves a copy of the video format in use. You can use this macro or explicitly call the WM_CAP_GET_VIDEOFORMAT message.

Syntax

DWORD capGetVideoFormat(
     hwnd,
     s,
     wSize
);

Parameters

hwnd

Handle to a capture window.

s

Pointer to a BITMAPINFO structure. You can also specify NULL to retrieve the number of bytes needed by BITMAPINFO.

wSize

Size, in bytes, of the structure referenced by s.

Return value

Type: DWORD

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.

Requirements

See also

Video Capture

Video Capture Macros