Calls the provided function once for each field in the #GstStructure. The function must not modify the fields. Also see gst.structure.Structure.mapInPlace and gst.structure.Structure.filterAndMapInPlace.
a function to call for each field
true if the supplied function returns true For each of the fields, false otherwise.
Calls the provided function once for each field in the #GstStructure. The function must not modify the fields. Also see gst.structure.Structure.mapInPlace and gst.structure.Structure.filterAndMapInPlace.