+extern std::shared_ptr<dcp::MonoPictureAsset> simple_picture (boost::filesystem::path path, std::string suffix, int frames = 24);
+extern std::shared_ptr<dcp::SoundAsset> simple_sound (boost::filesystem::path path, std::string suffix, dcp::MXFMetadata mxf_meta, std::string language, int frames = 24, int sample_rate = 48000);
+extern std::shared_ptr<dcp::Subtitle> simple_subtitle ();
+extern std::shared_ptr<dcp::ReelMarkersAsset> simple_markers (int frames = 24);
+extern std::shared_ptr<dcp::DCP> make_simple (boost::filesystem::path path, int reels = 1, int frames = 24);
+extern std::shared_ptr<dcp::DCP> make_simple_with_interop_subs (boost::filesystem::path path);
+extern std::shared_ptr<dcp::DCP> make_simple_with_smpte_subs (boost::filesystem::path path);
+extern std::shared_ptr<dcp::DCP> make_simple_with_interop_ccaps (boost::filesystem::path path);
+extern std::shared_ptr<dcp::DCP> make_simple_with_smpte_ccaps (boost::filesystem::path path);
+extern std::shared_ptr<dcp::OpenJPEGImage> black_image (dcp::Size size = dcp::Size(1998, 1080));
+extern std::shared_ptr<dcp::ReelAsset> black_picture_asset (boost::filesystem::path dir, int frames = 24);
+extern boost::filesystem::path find_file (boost::filesystem::path dir, std::string filename_part);
+
+/** Creating an object of this class will make asdcplib's random number generation
+ * (more) predictable.
+ */
+class RNGFixer
+{
+public:
+ RNGFixer ();
+ ~RNGFixer ();
+};