void signal_change (ChangeType, Property);
void signal_change (ChangeType, int);
std::string video_identifier () const;
void playlist_change (ChangeType);
void playlist_order_changed ();
void playlist_content_change (ChangeType type, boost::weak_ptr<Content>, int, bool frequent);
void signal_change (ChangeType, Property);
void signal_change (ChangeType, int);
std::string video_identifier () const;
void playlist_change (ChangeType);
void playlist_order_changed ();
void playlist_content_change (ChangeType type, boost::weak_ptr<Content>, int, bool frequent);