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how to use the auto focus value in DM8127?

hello anyone who can offer assist:

in my RDK(versiopn 3.5), I found 2 interface to get focus value:  CameraLink_getAfData & CameraLink_getFocusValue, who in kindly can explain the difference between them.

And, when I trace it to the regisiter "AFBUFST", what struct of this will return back to user?  thanks very much!!