HIKVISION DS-4 Series - 5.1.42. ClearDisplayRegion(); 5.1.43. SetDisplayRegionPosition(); 5.1.44. FillDisplayRegion(); 5.1.56. RegisterDecoderVideoCaptureCallback()

Technical Manual
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UINT nFrameNum Frame number of current frame grabbed
UINT nFrameTime Relative time of current frame grabbed (ms)
SYSTEMTIME *pFrameAbsoluteTime Absolute time of current frame grabbed
void *context Context when invoke callback function.
Return value:
Return 0 if successful, return error code if failed.
5.1.57. int HW_SetDecoderVideoCapture(HANDLE hChannel,BOOL bStart,UINT param)
Explanation:
Start or stop grabbing decoded data in yuv420 format.
Parameters:
HANDLE hChannel Channel handle
BOOL bStart Start or Stop grabbing.
UINT param Reserved, value is 0
Return Value:
Return 0 if successful, return error code if failed.