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capVideoStreamCallback callback function

The capVideoStreamCallback function is the callback function used with streaming capture to optionally process a frame of captured video. The name capVideoStreamCallback is a placeholder for the application-supplied function name.

To set this callback for streaming capture, send the WM_CAP_SET_CALLBACK_VIDEOSTREAM message to the capture window or call the capSetCallbackOnVideoStream macro.

To set this callback for preview frame capture, send the WM_CAP_SET_CALLBACK_FRAME message to the capture window or call the capSetCallbackOnFrame macro.

Syntax


LRESULT CALLBACK capVideoStreamCallback(
   HWND       hWnd,
   LPVIDEOHDR lpVHdr
);

Parameters

hWnd

Handle to the capture window associated with the callback function.

lpVHdr

Pointer to a VIDEOHDR structure containing information about the captured frame.

Remarks

The capture window calls a video stream callback function when a video buffer is marked done by the capture driver. When capturing to disk, this will precede the disk write operation.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Vfw.h

See also

Video Capture
Video Capture Functions

 

 

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