+private:
+ void register_constants();
+ void register_class(const char *class_name, const luaL_Reg *funcs);
+
+ std::mutex m;
+ lua_State *L; // Protected by <m>.
+ const InputState *input_state = nullptr; // Protected by <m>. Only set temporarily, during chain setup.
+ movit::ResourcePool *resource_pool;
+ int num_channels;
+ unsigned num_cards;
+
+ std::mutex map_m;
+ std::map<int, int> signal_to_card_mapping; // Protected by <map_m>.
+
+ std::vector<FFmpegCapture *> video_inputs;
+ std::vector<std::pair<LiveInputWrapper *, FFmpegCapture *>> video_signal_connections;
+#ifdef HAVE_CEF
+ std::vector<CEFCapture *> html_inputs;
+ std::vector<std::pair<LiveInputWrapper *, CEFCapture *>> html_signal_connections;
+#endif
+
+ friend class LiveInputWrapper;
+};
+
+// LiveInputWrapper is a facade on top of an YCbCrInput, exposed to
+// the Lua code. It contains a function (connect_signal()) intended
+// to be called during chain setup, that picks out the current frame
+// (in the form of a set of textures) from the input state given by
+// the mixer, and communicates that state over to the actual YCbCrInput.
+class LiveInputWrapper {
+public:
+ // Note: <override_bounce> is irrelevant for PixelFormat_8BitBGRA.
+ LiveInputWrapper(Theme *theme, movit::EffectChain *chain, bmusb::PixelFormat pixel_format, bool override_bounce, bool deinterlace);
+
+ void connect_signal(int signal_num); // Must be called with the theme's <m> lock held, since it accesses theme->input_state.
+ void connect_signal_raw(int signal_num, const InputState &input_state);
+ movit::Effect *get_effect() const