GstFilterFunc ()

gboolean    (*GstFilterFunc)                (gpointer obj,
                                             gpointer user_data);

gst_filter_run ()

GList*      gst_filter_run                  (const GList *list,
                                             GstFilterFunc func,
                                             gboolean first,
                                             gpointer user_data);

Iterates over the elements in list, calling func with the list item data for each item. If func returns TRUE, data is prepended to the list of results returned. If first is true, the search is halted after the first result is found.