+#include <stdio.h>
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+#include <new>
+#include <utility>
+
+#include <movit/effect_chain.h>
+#include <movit/ycbcr_input.h>
+#include <movit/white_balance_effect.h>
+
+#include "theme.h"
+
+#define WIDTH 1280 // FIXME
+#define HEIGHT 720 // FIXME
+
+using namespace std;
+using namespace movit;
+
+namespace {
+
+vector<LiveInputWrapper *> live_inputs;
+
+template<class T, class... Args>
+int wrap_lua_object(lua_State* L, const char *class_name, Args&&... args)
+{
+ // Construct the C++ object and put it on the stack.
+ void *mem = lua_newuserdata(L, sizeof(T));
+ new(mem) T(std::forward<Args>(args)...);
+
+ // Look up the metatable named <class_name>, and set it on the new object.
+ luaL_getmetatable(L, class_name);
+ lua_setmetatable(L, -2);
+
+ return 1;
+}
+
+Theme *get_theme_updata(lua_State* L)
+{
+ luaL_checktype(L, lua_upvalueindex(1), LUA_TLIGHTUSERDATA);
+ return (Theme *)lua_touserdata(L, lua_upvalueindex(1));
+}
+
+bool checkbool(lua_State* L, int idx)
+{
+ luaL_checktype(L, idx, LUA_TBOOLEAN);
+ return lua_toboolean(L, idx);
+}
+
+int EffectChain_new(lua_State* L)
+{
+ assert(lua_gettop(L) == 2);
+ int aspect_w = luaL_checknumber(L, 1);
+ int aspect_h = luaL_checknumber(L, 2);
+
+ return wrap_lua_object<EffectChain>(L, "EffectChain", aspect_w, aspect_h);
+}
+
+int EffectChain_add_live_input(lua_State* L)
+{
+ assert(lua_gettop(L) == 1);
+ Theme *theme = get_theme_updata(L);
+ EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
+ return wrap_lua_object<LiveInputWrapper>(L, "LiveInputWrapper", theme, chain);
+}
+
+int EffectChain_add_effect(lua_State* L)
+{
+ assert(lua_gettop(L) == 3);
+ EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
+
+ // FIXME: This needs a lot of work.
+ Effect *effect1 = (Effect *)luaL_checkudata(L, 2, "WhiteBalanceEffect");
+ LiveInputWrapper *effect2 = (LiveInputWrapper *)luaL_checkudata(L, 3, "LiveInputWrapper");
+ chain->add_effect(effect1, effect2->get_input());
+
+ lua_settop(L, 2);
+ return 1;
+}
+
+int EffectChain_finalize(lua_State* L)
+{
+ assert(lua_gettop(L) == 2);
+ EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
+ bool is_main_chain = checkbool(L, 2);
+
+ // Add outputs as needed.
+ ImageFormat inout_format;
+ inout_format.color_space = COLORSPACE_sRGB;
+ inout_format.gamma_curve = GAMMA_sRGB;
+ if (is_main_chain) {
+ YCbCrFormat output_ycbcr_format;
+ output_ycbcr_format.chroma_subsampling_x = 1;
+ output_ycbcr_format.chroma_subsampling_y = 1;
+ output_ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ output_ycbcr_format.full_range = false;
+
+ chain->add_ycbcr_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, output_ycbcr_format, YCBCR_OUTPUT_SPLIT_Y_AND_CBCR);
+ chain->set_dither_bits(8);
+ chain->set_output_origin(OUTPUT_ORIGIN_TOP_LEFT);
+ }
+ chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
+
+ chain->finalize();
+ return 0;
+}
+
+int LiveInputWrapper_connect_signal(lua_State* L)
+{
+ assert(lua_gettop(L) == 2);
+ LiveInputWrapper *input = (LiveInputWrapper *)luaL_checkudata(L, 1, "LiveInputWrapper");
+ int signal_num = luaL_checknumber(L, 2);
+ input->connect_signal(signal_num);
+ return 0;
+}
+
+int WhiteBalanceEffect_new(lua_State* L)
+{
+ assert(lua_gettop(L) == 0);
+ return wrap_lua_object<WhiteBalanceEffect>(L, "WhiteBalanceEffect");
+}
+
+int WhiteBalanceEffect_set_float(lua_State *L)
+{
+ assert(lua_gettop(L) == 3);
+ WhiteBalanceEffect *effect = (WhiteBalanceEffect *)luaL_checkudata(L, 1, "WhiteBalanceEffect");
+ size_t len;
+ const char* cstr = lua_tolstring(L, 2, &len);
+ std::string key(cstr, len);
+ float value = luaL_checknumber(L, 3);
+ (void)effect->set_float(key, value);
+ return 0;
+}
+
+const luaL_Reg EffectChain_funcs[] = {
+ { "new", EffectChain_new },
+ { "add_live_input", EffectChain_add_live_input },
+ { "add_effect", EffectChain_add_effect },
+ { "finalize", EffectChain_finalize },
+ { NULL, NULL }
+};
+
+const luaL_Reg LiveInputWrapper_funcs[] = {
+ { "connect_signal", LiveInputWrapper_connect_signal },
+ { NULL, NULL }
+};
+
+const luaL_Reg WhiteBalanceEffect_funcs[] = {
+ { "new", WhiteBalanceEffect_new },
+ { "set_float", WhiteBalanceEffect_set_float },
+ { NULL, NULL }
+};
+
+} // namespace
+
+LiveInputWrapper::LiveInputWrapper(Theme *theme, EffectChain *chain)
+ : theme(theme)
+{
+ ImageFormat inout_format;
+ inout_format.color_space = COLORSPACE_sRGB;
+ inout_format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat input_ycbcr_format;
+ input_ycbcr_format.chroma_subsampling_x = 2;
+ input_ycbcr_format.chroma_subsampling_y = 1;
+ input_ycbcr_format.cb_x_position = 0.0;
+ input_ycbcr_format.cr_x_position = 0.0;
+ input_ycbcr_format.cb_y_position = 0.5;
+ input_ycbcr_format.cr_y_position = 0.5;
+ input_ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ input_ycbcr_format.full_range = false;
+
+ input = new YCbCrInput(inout_format, input_ycbcr_format, WIDTH, HEIGHT, YCBCR_INPUT_SPLIT_Y_AND_CBCR);
+ chain->add_input(input);
+}
+
+void LiveInputWrapper::connect_signal(int signal_num)
+{
+ theme->connect_signal(input, signal_num);
+}
+
+Theme::Theme(const char *filename, ResourcePool *resource_pool)
+ : resource_pool(resource_pool)
+{
+ L = luaL_newstate();
+ luaL_openlibs(L);
+
+ printf("constructing, this=%p\n", this);
+
+ register_class("EffectChain", EffectChain_funcs);
+ register_class("LiveInputWrapper", LiveInputWrapper_funcs);
+ register_class("WhiteBalanceEffect", WhiteBalanceEffect_funcs);
+
+ // Run script.
+ lua_settop(L, 0);
+ if (luaL_dofile(L, filename)) {
+ fprintf(stderr, "error: %s\n", lua_tostring(L, -1));
+ lua_pop(L, 1);
+ exit(1);
+ }
+ assert(lua_gettop(L) == 0);
+}
+
+void Theme::register_class(const char *class_name, const luaL_Reg *funcs)
+{
+ luaL_newmetatable(L, class_name);
+ lua_pushlightuserdata(L, this);
+ luaL_setfuncs(L, funcs, 1);
+ lua_pushvalue(L, -1);
+ lua_setfield(L, -2, "__index");
+ lua_setglobal(L, class_name);
+}
+
+pair<EffectChain *, function<void()>>
+Theme::get_chain(unsigned num, float t, unsigned width, unsigned height)
+{
+ unique_lock<mutex> lock(m);
+ lua_getglobal(L, "get_chain"); /* function to be called */
+ lua_pushnumber(L, num);
+ lua_pushnumber(L, t);
+ lua_pushnumber(L, width);
+ lua_pushnumber(L, height);
+
+ if (lua_pcall(L, 4, 2, 0) != 0) {
+ fprintf(stderr, "error running function `get_chain': %s", lua_tostring(L, -1));
+ exit(1);
+ }
+
+ EffectChain *chain = (EffectChain *)luaL_checkudata(L, -2, "EffectChain");
+ if (!lua_isfunction(L, -1)) {
+ fprintf(stderr, "Argument #-1 should be a function\n");
+ exit(1);
+ }
+ lua_pushvalue(L, -1);
+ int funcref = luaL_ref(L, LUA_REGISTRYINDEX); // TODO: leak!
+ lua_pop(L, 2);
+ return make_pair(chain, [this, funcref]{
+ unique_lock<mutex> lock(m);
+
+ // Set up state, including connecting signals.
+ lua_rawgeti(L, LUA_REGISTRYINDEX, funcref);
+ lua_pcall(L, 0, 0, 0);
+ });
+}
+
+void Theme::connect_signal(YCbCrInput *input, int signal_num)
+{
+ input->set_texture_num(0, input_textures[signal_num].tex_y);
+ input->set_texture_num(1, input_textures[signal_num].tex_cbcr);
+}