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