-extern std::string crop_string (Position, Size);
-extern int dcp_audio_sample_rate (int);
-extern std::string colour_lut_index_to_name (int index);
+extern int dcp_audio_frame_rate (int);
+extern int stride_round_up (int, int const *, int);
+extern int stride_lookup (int c, int const * stride);
+extern std::multimap<std::string, std::string> read_key_value (std::istream& s);
+extern int get_required_int (std::multimap<std::string, std::string> const & kv, std::string k);
+extern float get_required_float (std::multimap<std::string, std::string> const & kv, std::string k);
+extern std::string get_required_string (std::multimap<std::string, std::string> const & kv, std::string k);
+extern int get_optional_int (std::multimap<std::string, std::string> const & kv, std::string k);
+extern std::string get_optional_string (std::multimap<std::string, std::string> const & kv, std::string k);