-extern std::string video_asset_filename (boost::shared_ptr<dcp::PictureAsset> asset);
-extern std::string audio_asset_filename (boost::shared_ptr<dcp::SoundAsset> asset);
+extern std::string video_asset_filename (boost::shared_ptr<dcp::PictureAsset> asset, int reel_index, int reel_count, boost::optional<std::string> content_summary);
+extern std::string audio_asset_filename (boost::shared_ptr<dcp::SoundAsset> asset, int reel_index, int reel_count, boost::optional<std::string> content_summary);
+extern float relaxed_string_to_float (std::string);
+extern bool string_not_empty (std::string);