-extern int64_t video_frames_to_audio_frames (VideoFrame v, float audio_sample_rate, float frames_per_second);
+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, 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 std::string careful_string_filter (std::string);
+extern std::pair<int, int> audio_channel_types (std::list<int> mapped, int channels);
+extern boost::shared_ptr<AudioBuffers> remap (boost::shared_ptr<const AudioBuffers> input, int output_channels, AudioMapping map);
+extern Eyes increment_eyes (Eyes e);