Optionalold_taglist: TagListpointer to a pointer to a Gst.TagList to be replaced.
Optionalnew_taglist: TagListpointer to a Gst.TagList that will replace the tag list pointed to by old_taglist.
true if new_taglist was different from old_taglist
Modifies a pointer to a Gst.TagList to point to a different Gst.TagList. The modification is done atomically (so this is useful for ensuring thread safety in some cases), and the reference counts are updated appropriately (the old tag list is unreffed, the new is reffed).
Either
new_taglistor the Gst.TagList pointed to byold_taglistmay benull.