Calls the provided function once for each field in the gstreamer.Structure The function must not modify the fields. Also see Structure.mapInPlace and Structure.filterAndMapInPlace.
a function to call for each field
private data
TRUE if the supplied function returns TRUE For each of the fields, FALSE otherwise.
Calls the provided function once for each field in the gstreamer.Structure The function must not modify the fields. Also see Structure.mapInPlace and Structure.filterAndMapInPlace.