Calls the provided function once for each field in the gstreamer.Structure In
contrast to Structure.foreach, the function may modify the fields.
In contrast to Structure.mapInPlace, the field is removed from
the structure if FALSE is returned from the function.
The structure must be mutable.
Calls the provided function once for each field in the gstreamer.Structure In contrast to Structure.foreach, the function may modify the fields. In contrast to Structure.mapInPlace, the field is removed from the structure if FALSE is returned from the function. The structure must be mutable.