Calls the provided function once for each field in the gstreamer.Structure In contrast to Structure.foreach, the function may modify but not delete the fields. The structure must be mutable.
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 In contrast to Structure.foreach, the function may modify but not delete the fields. The structure must be mutable.