Page 222 - PDA Robotics Using Your Personal Digital Assistant to Control Your Robot

PDA 10 5/27/03 8:51 AM Page 198
// PDA Robotics
// Activate the motion detection
//
CAPTUREPARMS cap_params;
long struct_size = sizeof( CAPTUREPARMS );
capCaptureGetSetup( h_capwin, &cap_params, struct_size);
cap_params.fLimitEnabled = FALSE;
cap_params.fAbortLeftMouse = FALSE;
cap_params.fAbortRightMouse = FALSE;
cap_params.wTimeLimit = 3600; // reset after 60 second test
cap_params.fYield = TRUE;
//
// Throw away the audio for now ... will use same algorithm
// for sound detection
//

cap_params.fCaptureAudio = FALSE;
cap_params.wNumVideoRequested = 1;
capCaptureSetSetup( h_capwin, &cap_params, struct_size);

//
// Set the callback to which the vidoe will be stramed
//

BOOL ret = capSetCallbackOnVideoStream( h_capwin, (LPVOID) stream_callback );
capCaptureSequenceNoFile( h_capwin );

}else{
//
// Unchecked the motion detection
//
m_radar_stat.SetWindowText("Motion Sense : OFF");
capCaptureAbort(h_capwin);
m_stretch_video.EnableWindow(TRUE);
}
}

The video frames will be sent to this callback function where we will
compare the last video frame sent to the current

LRESULT stream_callback(HWND hWnd, LPVIDEOHDR lpVHdr)
{
static initialized;
static DWORD frame_same_total;
static last_frame_bytes;
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