function is the callback function used for precision control to begin and end
streaming capture. The capControlCallback
callback function is a placeholder for the application-supplied function name.
LRESULT CALLBACK capControlCallback(
Handle of the capture window associated with the callback function.
Current state of the capture operation. The CONTROLCALLBACK_PREROLL value is
sent initially to enable prerolling of the video sources and to return control
to the capture application at the exact moment recording is to begin. The
CONTROLCALLBACK_CAPTURING value is sent once per captured frame to indicate that
streaming capture is in progress and to enable the application to end capture.
is set to CONTROLCALLBACK_PREROLL, this callback function must return TRUE to
start capture or FALSE to abort it. When nState
is set to CONTROLCALLBACK_CAPTURING, this callback function must return TRUE
to continue capture or FALSE to end it.
The first message sent to the callback procedure sets the nState
parameter to CONTROLCALLBACK_PREROLL after allocating all buffers and all
other capture preparations are complete.
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