WM_CAP_SET_CALLBACK_VIDEOSTREAM
The
WM_CAP_SET_CALLBACK_VIDEOSTREAM message sets a callback function in the
application. AVICap calls this procedure during streaming capture when a video
buffer is filled. You can send this message explicitly or by using the capSetCallbackOnVideoStream macro.
WM_CAP_SET_CALLBACK_VIDEOSTREAM
wParam = (WPARAM) 0;
lParam = (LPARAM) (LPVOID) (fpProc);
Parameters
fpProc
Address of
the video-stream callback function. Specify NULL for this parameter to disable
a previously installed video-stream callback function.
Return Values
Returns TRUE
if successful or FALSE if streaming capture or a single-frame capture session
is in progress.
Remarks
The capture
window calls the callback function before writing the captured frame to disk.
This allows applications to modify the frame if desired.
If a video
stream callback function is used for streaming capture, the procedure must be
installed before starting the capture session and it must remain enabled for
the duration of the session. It can be disabled after streaming capture ends.
See Also