+extern dcp::Size scale_for_display (dcp::Size s, dcp::Size display_container, dcp::Size film_container);
+
+template <class T>
+std::list<T>
+vector_to_list (std::vector<T> v)
+{
+ std::list<T> l;
+ BOOST_FOREACH (T& i, v) {
+ l.push_back (i);
+ }
+ return l;
+}
+
+template <class T>
+std::vector<T>
+list_to_vector (std::list<T> v)
+{
+ std::vector<T> l;
+ BOOST_FOREACH (T& i, v) {
+ l.push_back (i);
+ }
+ return l;
+}
+
+extern double db_to_linear (double db);
+extern double linear_to_db (double linear);