-extern dcp::FrameInfo read_frame_info (FILE* file, int frame, Eyes eyes);
-extern void write_frame_info (FILE* file, int frame, Eyes eyes, dcp::FrameInfo info);
-extern std::map<std::string, std::string> split_get_request (std::string url);
-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 subtitle_content_filename (boost::shared_ptr<dcp::SubtitleAsset> content);
+extern std::string video_asset_filename (std::shared_ptr<dcp::PictureAsset> asset, int reel_index, int reel_count, boost::optional<std::string> content_summary);
+extern std::string audio_asset_filename (std::shared_ptr<dcp::SoundAsset> asset, int reel_index, int reel_count, boost::optional<std::string> content_summary);
+extern std::string subtitle_asset_filename (std::shared_ptr<dcp::SubtitleAsset> asset, int reel_index, int reel_count, boost::optional<std::string> content_summary, std::string extension);
+extern std::string atmos_asset_filename (std::shared_ptr<dcp::AtmosAsset> asset, int reel_index, int reel_count, boost::optional<std::string> content_summary);
+extern std::string careful_string_filter (std::string);
+extern std::pair<int, int> audio_channel_types (std::list<int> mapped, int channels);
+extern std::shared_ptr<AudioBuffers> remap (std::shared_ptr<const AudioBuffers> input, int output_channels, AudioMapping map);
+extern size_t utf8_strlen (std::string s);
+extern void emit_subtitle_image (dcpomatic::ContentTimePeriod period, dcp::SubtitleImage sub, dcp::Size size, std::shared_ptr<TextDecoder> decoder);
+extern void copy_in_bits (boost::filesystem::path from, boost::filesystem::path to, std::function<void (float)>);
+extern dcp::Size scale_for_display (dcp::Size s, dcp::Size display_container, dcp::Size film_container, PixelQuanta quanta);
+extern dcp::DecryptedKDM decrypt_kdm_with_helpful_error (dcp::EncryptedKDM kdm);
+extern boost::filesystem::path default_font_file ();
+extern void start_of_thread (std::string name);
+extern void capture_asdcp_logs ();
+extern std::string error_details(boost::system::error_code ec);
+extern bool contains_assetmap(boost::filesystem::path dir);