capVideoStreamCallback

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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.

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

**  Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
**  Windows 95/98/Me:** Included in Windows 95 and later.
**  Header:** Declared in Vfw.h.

  Library: Use Vfw32.lib.

See Also

Video Capture, Video Capture Functions, capSetCallbackOnFrame, VIDEOHDR