A function that will be called in gst_structure_filter_and_map_in_place(). The function may modify value, and the value will be removed from the structure if %FALSE is returned.
value,
the #GQuark of the field name
the #GValue of the field
A function that will be called in gst_structure_filter_and_map_in_place(). The function may modify
value,and the value will be removed from the structure if %FALSE is returned.