CaptureStatus
writes a Capture object's (capture) status into the
structure pointed to by status, and also into the
implementation-specific structure pointed to by external
(if external is not NULL).
The Capture object's status information in external
is in addition to the Capture object's status information
in status, i.e, the status configuration information
in status and in external is not the same information.
Note that status or external can be
NULL (but not both NULL).
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