git.sesse.net Git - nageru/blob - nageru/scene.cpp

   1 #include <assert.h>
   2 extern "C" {
   3 #include <lauxlib.h>
   4 #include <lua.hpp>
   5 }
   6
   7 #ifdef HAVE_CEF
   8 #include "cef_capture.h"
   9 #endif
  10 #include "ffmpeg_capture.h"
  11 #include "flags.h"
  12 #include "image_input.h"
  13 #include "input_state.h"
  14 #include "lua_utils.h"
  15 #include "scene.h"
  16 #include "theme.h"
  17
  18 using namespace movit;
  19 using namespace std;
  20
  21 bool display(Block *block, lua_State *L, int idx);
  22
  23 EffectType current_type(const Block *block)
  24 {
  25         return block->alternatives[block->currently_chosen_alternative]->effect_type;
  26 }
  27
  28 int find_index_of(const Block *block, EffectType val)
  29 {
  30         for (size_t idx = 0; idx < block->alternatives.size(); ++idx) {
  31                 if (block->alternatives[idx]->effect_type == val) {
  32                         return idx;
  33                 }
  34         }
  35         return -1;
  36 }
  37
  38 Scene::Scene(Theme *theme, float aspect_nom, float aspect_denom)
  39         : theme(theme), aspect_nom(aspect_nom), aspect_denom(aspect_denom), resource_pool(theme->get_resource_pool()) {}
  40
  41 size_t Scene::compute_chain_number(bool is_main_chain) const
  42 {
  43         assert(chains.size() > 0);
  44         assert(chains.size() % 2 == 0);
  45         bitset<256> disabled = find_disabled_blocks(size_t(-1));
  46
  47         size_t chain_number = compute_chain_number_for_block(blocks.size() - 1, disabled);
  48         assert(chain_number < chains.size() / 2);
  49         if (is_main_chain) {
  50                 chain_number += chains.size() / 2;
  51         }
  52         return chain_number;
  53 }
  54
  55 size_t Scene::compute_chain_number_for_block(size_t block_idx, const bitset<256> &disabled) const
  56 {
  57         Block *block = blocks[block_idx];
  58         size_t chain_number;
  59
  60         size_t currently_chosen_alternative;
  61         if (disabled.test(block_idx)) {
  62                 // It doesn't matter, so pick 0 as the canonical choice
  63                 // (this is the only one that is actually instantiated).
  64                 currently_chosen_alternative = 0;
  65         } else {
  66                 currently_chosen_alternative = block->currently_chosen_alternative;
  67         }
  68         assert(currently_chosen_alternative < block->alternatives.size());
  69
  70         if (block_idx == 0) {
  71                 assert(block->cardinality_base == 1);
  72                 chain_number = currently_chosen_alternative;
  73         } else {
  74                 chain_number = compute_chain_number_for_block(block_idx - 1, disabled) + block->cardinality_base * currently_chosen_alternative;
  75         }
  76         return chain_number;
  77 }
  78
  79 bitset<256> Scene::find_disabled_blocks(size_t chain_idx) const
  80 {
  81         assert(blocks.size() < 256);
  82
  83         bitset<256> ret;
  84         find_disabled_blocks(chain_idx, blocks.size() - 1, /*currently_disabled=*/false, &ret);
  85         return ret;
  86 }
  87
  88 void Scene::find_disabled_blocks(size_t chain_idx, size_t block_idx, bool currently_disabled, bitset<256> *disabled) const
  89 {
  90         if (currently_disabled) {
  91                 disabled->set(block_idx);
  92         }
  93         Block *block = blocks[block_idx];
  94         EffectType chosen_type = block->alternatives[block->chosen_alternative(chain_idx)]->effect_type;
  95         for (size_t input_idx = 0; input_idx < block->inputs.size(); ++input_idx) {
  96                 if (chosen_type == IDENTITY_EFFECT && input_idx > 0) {
  97                         // Multi-input effect that has been replaced by
  98                         // IdentityEffect, so every effect but the first are
  99                         // disabled and will not participate in the chain.
 100                         find_disabled_blocks(chain_idx, block->inputs[input_idx], /*currently_disabled=*/true, disabled);
 101                 } else {
 102                         // Just keep on recursing down.
 103                         find_disabled_blocks(chain_idx, block->inputs[input_idx], currently_disabled, disabled);
 104                 }
 105         }
 106 }
 107
 108 bool Scene::is_noncanonical_chain(size_t chain_idx) const
 109 {
 110         bitset<256> disabled = find_disabled_blocks(chain_idx);
 111         if (disabled.none()) {
 112                 return false;
 113         }
 114         assert(blocks.size() < 256);
 115         for (size_t block_idx = 0; block_idx < blocks.size(); ++block_idx) {
 116                 if (disabled.test(block_idx) && blocks[block_idx]->chosen_alternative(chain_idx) != 0) {
 117                         return true;
 118                 }
 119         }
 120         return false;
 121 }
 122
 123 int Scene::add_input(lua_State* L)
 124 {
 125         assert(lua_gettop(L) == 1 || lua_gettop(L) == 2);
 126         Scene *scene = (Scene *)luaL_checkudata(L, 1, "Scene");
 127
 128         Block *block = new Block;
 129         block->idx = scene->blocks.size();
 130         if (lua_gettop(L) == 1) {
 131                 // No parameter given, so a flexible input.
 132                 block->alternatives.emplace_back(new EffectBlueprint(LIVE_INPUT_YCBCR));
 133                 block->alternatives.emplace_back(new EffectBlueprint(LIVE_INPUT_YCBCR_WITH_DEINTERLACE));
 134                 block->alternatives.emplace_back(new EffectBlueprint(LIVE_INPUT_YCBCR_PLANAR));
 135                 block->alternatives.emplace_back(new EffectBlueprint(LIVE_INPUT_BGRA));
 136                 block->alternatives.emplace_back(new EffectBlueprint(IMAGE_INPUT));
 137         } else {
 138                 // Input of a given type. We'll specialize it here, plus connect the input as given.
 139                 if (lua_isnumber(L, 2)) {
 140                         block->alternatives.emplace_back(new EffectBlueprint(LIVE_INPUT_YCBCR));
 141                         block->alternatives.emplace_back(new EffectBlueprint(LIVE_INPUT_YCBCR_WITH_DEINTERLACE));
 142 #ifdef HAVE_CEF
 143                 } else if (luaL_testudata(L, 2, "HTMLInput")) {
 144                         block->alternatives.emplace_back(new EffectBlueprint(LIVE_INPUT_BGRA));
 145 #endif
 146                 } else if (luaL_testudata(L, 2, "VideoInput")) {
 147                         FFmpegCapture *capture = *(FFmpegCapture **)luaL_checkudata(L, 2, "VideoInput");
 148                         if (capture->get_current_pixel_format() == bmusb::PixelFormat_8BitYCbCrPlanar) {
 149                                 block->alternatives.emplace_back(new EffectBlueprint(LIVE_INPUT_YCBCR_PLANAR));
 150                         } else {
 151                                 assert(capture->get_current_pixel_format() == bmusb::PixelFormat_8BitBGRA);
 152                                 block->alternatives.emplace_back(new EffectBlueprint(LIVE_INPUT_BGRA));
 153                         }
 154                 } else if (luaL_testudata(L, 2, "ImageInput")) {
 155                         block->alternatives.emplace_back(new EffectBlueprint(IMAGE_INPUT));
 156                 } else {
 157                         luaL_error(L, "add_input() called with something that's not a signal (a signal number, a HTML input, or a VideoInput)");
 158                 }
 159                 bool ok = display(block, L, 2);
 160                 assert(ok);
 161         }
 162         block->is_input = true;
 163         scene->blocks.push_back(block);
 164
 165         return wrap_lua_existing_object_nonowned<Block>(L, "Block", block);
 166 }
 167
 168 void Scene::find_inputs_for_block(lua_State *L, Scene *scene, Block *block)
 169 {
 170         if (lua_gettop(L) == 2) {
 171                 // Implicitly the last added effect.
 172                 assert(!scene->blocks.empty());
 173                 block->inputs.push_back(scene->blocks.size() - 1);
 174                 return;
 175         }
 176
 177         for (int idx = 3; idx <= lua_gettop(L); ++idx) {
 178                 Block *input_block = nullptr;
 179                 if (luaL_testudata(L, idx, "Block")) {
 180                         input_block = *(Block **)luaL_checkudata(L, idx, "Block");
 181                 } else {
 182                         EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, idx, "EffectBlueprint");
 183
 184                         // Search through all the blocks to figure out which one contains this effect.
 185                         for (Block *block : scene->blocks) {
 186                                 if (find(block->alternatives.begin(), block->alternatives.end(), blueprint) != block->alternatives.end()) {
 187                                         input_block = block;
 188                                         break;
 189                                 }
 190                         }
 191                         if (input_block == nullptr) {
 192                                 luaL_error(L, "Input effect in parameter #%d has not been added to this scene", idx - 1);
 193                         }
 194                 }
 195                 block->inputs.push_back(input_block->idx);
 196         }
 197 }
 198
 199 int Scene::add_effect(lua_State* L)
 200 {
 201         assert(lua_gettop(L) >= 2);
 202         Scene *scene = (Scene *)luaL_checkudata(L, 1, "Scene");
 203
 204         Block *block = new Block;
 205         block->idx = scene->blocks.size();
 206
 207         if (lua_istable(L, 2)) {
 208                 size_t len = lua_objlen(L, 2);
 209                 for (size_t i = 0; i < len; ++i) {
 210                         lua_rawgeti(L, 2, i + 1);
 211                         EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, -1, "EffectBlueprint");
 212                         block->alternatives.push_back(blueprint);
 213                         lua_settop(L, -2);
 214                 }
 215         } else {
 216                 EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, 2, "EffectBlueprint");
 217                 block->alternatives.push_back(blueprint);
 218         }
 219
 220         find_inputs_for_block(L, scene, block);
 221         scene->blocks.push_back(block);
 222
 223         return wrap_lua_existing_object_nonowned<Block>(L, "Block", block);
 224 }
 225
 226 int Scene::add_optional_effect(lua_State* L)
 227 {
 228         assert(lua_gettop(L) >= 2);
 229         Scene *scene = (Scene *)luaL_checkudata(L, 1, "Scene");
 230
 231         Block *block = new Block;
 232         block->idx = scene->blocks.size();
 233
 234         EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, 2, "EffectBlueprint");
 235         block->alternatives.push_back(blueprint);
 236
 237         // An IdentityEffect will be the alternative for when the effect is disabled.
 238         block->alternatives.push_back(new EffectBlueprint(IDENTITY_EFFECT));
 239
 240         find_inputs_for_block(L, scene, block);
 241         scene->blocks.push_back(block);
 242
 243         return wrap_lua_existing_object_nonowned<Block>(L, "Block", block);
 244 }
 245
 246 Effect *Scene::instantiate_effects(const Block *block, size_t chain_idx, Scene::Instantiation *instantiation)
 247 {
 248         // Find the chosen alternative for this block in this instance.
 249         EffectType chosen_type = block->alternatives[block->chosen_alternative(chain_idx)]->effect_type;
 250
 251         vector<Effect *> inputs;
 252         for (size_t input_idx : block->inputs) {
 253                 inputs.push_back(instantiate_effects(blocks[input_idx], chain_idx, instantiation));
 254
 255                 // As a special case, we allow IdentityEffect to take only one input
 256                 // even if the other alternative (or alternatives) is multi-input.
 257                 // Thus, even if there are more than one inputs, instantiate only
 258                 // the first one.
 259                 if (chosen_type == IDENTITY_EFFECT) {
 260                         break;
 261                 }
 262         }
 263
 264         Effect *effect;
 265         switch (chosen_type) {
 266         case LIVE_INPUT_YCBCR:
 267         case LIVE_INPUT_YCBCR_WITH_DEINTERLACE:
 268         case LIVE_INPUT_YCBCR_PLANAR:
 269         case LIVE_INPUT_BGRA: {
 270                 bool deinterlace = (chosen_type == LIVE_INPUT_YCBCR_WITH_DEINTERLACE);
 271                 bool override_bounce = !deinterlace;  // For most chains, this will be fine. Reconsider if we see real problems somewhere; it's better than having the user try to understand it.
 272                 bmusb::PixelFormat pixel_format;
 273                 if (chosen_type == LIVE_INPUT_BGRA) {
 274                         pixel_format = bmusb::PixelFormat_8BitBGRA;
 275                 } else if (chosen_type == LIVE_INPUT_YCBCR_PLANAR) {
 276                         pixel_format = bmusb::PixelFormat_8BitYCbCrPlanar;
 277                 } else if (global_flags.ten_bit_input) {
 278                         pixel_format = bmusb::PixelFormat_10BitYCbCr;
 279                 } else {
 280                         pixel_format = bmusb::PixelFormat_8BitYCbCr;
 281                 }
 282                 LiveInputWrapper *input = new LiveInputWrapper(theme, instantiation->chain.get(), pixel_format, override_bounce, deinterlace, /*user_connectable=*/true);
 283                 effect = input->get_effect();  // Adds itself to the chain, so no need to call add_effect().
 284                 instantiation->inputs.emplace(block->idx, input);
 285                 break;
 286         }
 287         case IMAGE_INPUT: {
 288                 ImageInput *input = new ImageInput;
 289                 instantiation->chain->add_input(input);
 290                 instantiation->image_inputs.emplace(block->idx, input);
 291                 effect = input;
 292                 break;
 293         }
 294         default:
 295                 effect = instantiate_effect(instantiation->chain.get(), chosen_type);
 296                 instantiation->chain->add_effect(effect, inputs);
 297                 break;
 298         }
 299         instantiation->effects.emplace(block->idx, effect);
 300         return effect;
 301 }
 302
 303 int Scene::finalize(lua_State* L)
 304 {
 305         bool only_one_mode = false;
 306         bool chosen_mode = false;
 307         if (lua_gettop(L) == 2) {
 308                 only_one_mode = true;
 309                 chosen_mode = checkbool(L, 2);
 310         } else {
 311                 assert(lua_gettop(L) == 1);
 312         }
 313         Scene *scene = (Scene *)luaL_checkudata(L, 1, "Scene");
 314         Theme *theme = get_theme_updata(L);
 315
 316         size_t base = 1;
 317         for (Block *block : scene->blocks) {
 318                 block->cardinality_base = base;
 319                 base *= block->alternatives.size();
 320         }
 321
 322         const size_t cardinality = base;
 323         size_t real_cardinality = 0;
 324         for (size_t chain_idx = 0; chain_idx < cardinality; ++chain_idx) {
 325                 if (!scene->is_noncanonical_chain(chain_idx)) {
 326                         ++real_cardinality;
 327                 }
 328         }
 329         const size_t total_cardinality = real_cardinality * (only_one_mode ? 1 : 2);
 330         if (total_cardinality > 200) {
 331                 print_warning(L, "The given Scene will instantiate %zu different versions. This will take a lot of time and RAM to compile; see if you could limit some options by e.g. locking the input type in some cases (by giving a fixed input to add_input()).\n",
 332                         total_cardinality);
 333         }
 334
 335         Block *output_block = scene->blocks.back();
 336         for (bool is_main_chain : { false, true }) {
 337                 for (size_t chain_idx = 0; chain_idx < cardinality; ++chain_idx) {
 338                         if ((only_one_mode && is_main_chain != chosen_mode) ||
 339                             scene->is_noncanonical_chain(chain_idx)) {
 340                                 scene->chains.emplace_back();
 341                                 continue;
 342                         }
 343
 344                         Scene::Instantiation instantiation;
 345                         instantiation.chain.reset(new EffectChain(scene->aspect_nom, scene->aspect_denom, theme->get_resource_pool()));
 346                         scene->instantiate_effects(output_block, chain_idx, &instantiation);
 347
 348                         add_outputs_and_finalize(instantiation.chain.get(), is_main_chain);
 349                         scene->chains.emplace_back(move(instantiation));
 350                 }
 351         }
 352         return 0;
 353 }
 354
 355 std::pair<movit::EffectChain *, std::function<void()>>
 356 Scene::get_chain(Theme *theme, lua_State *L, unsigned num, const InputState &input_state)
 357 {
 358         // For video inputs, pick the right interlaced/progressive version
 359         // based on the current state of the signals.
 360         InputStateInfo info(input_state);
 361         for (Block *block : blocks) {
 362                 if (block->is_input && block->signal_type_to_connect == Block::CONNECT_SIGNAL) {
 363                         EffectType chosen_type = current_type(block);
 364                         assert(chosen_type == LIVE_INPUT_YCBCR || chosen_type == LIVE_INPUT_YCBCR_WITH_DEINTERLACE);
 365                         if (info.last_interlaced[block->signal_to_connect]) {
 366                                 block->currently_chosen_alternative = find_index_of(block, LIVE_INPUT_YCBCR_WITH_DEINTERLACE);
 367                         } else {
 368                                 block->currently_chosen_alternative = find_index_of(block, LIVE_INPUT_YCBCR);
 369                         }
 370                 }
 371         }
 372
 373         // Pick out the right chain based on the current selections,
 374         // and snapshot all the set variables so that we can set them
 375         // in the prepare function even if they're being changed by
 376         // the Lua code later.
 377         bool is_main_chain = (num == 0);
 378         size_t chain_idx = compute_chain_number(is_main_chain);
 379         const Scene::Instantiation &instantiation = chains[chain_idx];
 380         EffectChain *effect_chain = instantiation.chain.get();
 381
 382         map<LiveInputWrapper *, int> signals_to_connect;
 383         map<ImageInput *, string> images_to_select;
 384         map<pair<Effect *, string>, int> int_to_set;
 385         map<pair<Effect *, string>, float> float_to_set;
 386         map<pair<Effect *, string>, array<float, 3>> vec3_to_set;
 387         map<pair<Effect *, string>, array<float, 4>> vec4_to_set;
 388         for (const auto &index_and_input : instantiation.inputs) {
 389                 Block *block = blocks[index_and_input.first];
 390                 EffectType chosen_type = current_type(block);
 391                 LiveInputWrapper *input = index_and_input.second;
 392                 if (chosen_type == LIVE_INPUT_YCBCR ||
 393                     chosen_type == LIVE_INPUT_YCBCR_WITH_DEINTERLACE ||
 394                     chosen_type == LIVE_INPUT_YCBCR_PLANAR ||
 395                     chosen_type == LIVE_INPUT_BGRA) {
 396                         if (block->signal_type_to_connect == Block::CONNECT_SIGNAL) {
 397                                 signals_to_connect.emplace(input, block->signal_to_connect);
 398 #ifdef HAVE_CEF
 399                         } else if (block->signal_type_to_connect == Block::CONNECT_CEF) {
 400                                 signals_to_connect.emplace(input, block->cef_to_connect->get_card_index());
 401 #endif
 402                         } else if (block->signal_type_to_connect == Block::CONNECT_VIDEO) {
 403                                 signals_to_connect.emplace(input, block->video_to_connect->get_card_index());
 404                         } else if (block->signal_type_to_connect == Block::CONNECT_NONE) {
 405                                 luaL_error(L, "An input in a scene was not connected to anything (forgot to call display())");
 406                         } else {
 407                                 assert(false);
 408                         }
 409                 }
 410         }
 411         for (const auto &index_and_input : instantiation.image_inputs) {
 412                 Block *block = blocks[index_and_input.first];
 413                 ImageInput *input = index_and_input.second;
 414                 if (current_type(block) == IMAGE_INPUT) {
 415                         images_to_select.emplace(input, block->pathname);
 416                 }
 417         }
 418         for (const auto &index_and_effect : instantiation.effects) {
 419                 Block *block = blocks[index_and_effect.first];
 420                 Effect *effect = index_and_effect.second;
 421
 422                 // Get the effects currently set on the block.
 423                 if (current_type(block) != IDENTITY_EFFECT) {  // Ignore settings on optional effects.
 424                         for (const auto &key_and_tuple : block->int_parameters) {
 425                                 int_to_set.emplace(make_pair(effect, key_and_tuple.first), key_and_tuple.second);
 426                         }
 427                         for (const auto &key_and_tuple : block->float_parameters) {
 428                                 float_to_set.emplace(make_pair(effect, key_and_tuple.first), key_and_tuple.second);
 429                         }
 430                         for (const auto &key_and_tuple : block->vec3_parameters) {
 431                                 vec3_to_set.emplace(make_pair(effect, key_and_tuple.first), key_and_tuple.second);
 432                         }
 433                         for (const auto &key_and_tuple : block->vec4_parameters) {
 434                                 vec4_to_set.emplace(make_pair(effect, key_and_tuple.first), key_and_tuple.second);
 435                         }
 436                 }
 437
 438                 // Parameters set on the blueprint itself override those that are set for the block,
 439                 // so they are set afterwards.
 440                 if (!block->alternatives.empty()) {
 441                         EffectBlueprint *blueprint = block->alternatives[block->currently_chosen_alternative];
 442                         for (const auto &key_and_tuple : blueprint->int_parameters) {
 443                                 int_to_set[make_pair(effect, key_and_tuple.first)] = key_and_tuple.second;
 444                         }
 445                         for (const auto &key_and_tuple : blueprint->float_parameters) {
 446                                 float_to_set[make_pair(effect, key_and_tuple.first)] = key_and_tuple.second;
 447                         }
 448                         for (const auto &key_and_tuple : blueprint->vec3_parameters) {
 449                                 vec3_to_set[make_pair(effect, key_and_tuple.first)] = key_and_tuple.second;
 450                         }
 451                         for (const auto &key_and_tuple : blueprint->vec4_parameters) {
 452                                 vec4_to_set[make_pair(effect, key_and_tuple.first)] = key_and_tuple.second;
 453                         }
 454                 }
 455         }
 456
 457         lua_pop(L, 1);
 458
 459         auto setup_chain = [L, theme, signals_to_connect, images_to_select, int_to_set, float_to_set, vec3_to_set, vec4_to_set, input_state]{
 460                 lock_guard<mutex> lock(theme->m);
 461
 462                 // Set up state, including connecting signals.
 463                 for (const auto &input_and_signal : signals_to_connect) {
 464                         LiveInputWrapper *input = input_and_signal.first;
 465                         input->connect_signal_raw(input_and_signal.second, input_state);
 466                 }
 467                 for (const auto &input_and_filename : images_to_select) {
 468                         input_and_filename.first->switch_image(input_and_filename.second);
 469                 }
 470                 for (const auto &effect_and_key_and_value : int_to_set) {
 471                         Effect *effect = effect_and_key_and_value.first.first;
 472                         const string &key = effect_and_key_and_value.first.second;
 473                         const int value = effect_and_key_and_value.second;
 474                         if (!effect->set_int(key, value)) {
 475                                 luaL_error(L, "Effect refused set_int(\"%s\", %d) (invalid key?)", key.c_str(), value);
 476                         }
 477                 }
 478                 for (const auto &effect_and_key_and_value : float_to_set) {
 479                         Effect *effect = effect_and_key_and_value.first.first;
 480                         const string &key = effect_and_key_and_value.first.second;
 481                         const float value = effect_and_key_and_value.second;
 482                         if (!effect->set_float(key, value)) {
 483                                 luaL_error(L, "Effect refused set_float(\"%s\", %f) (invalid key?)", key.c_str(), value);
 484                         }
 485                 }
 486                 for (const auto &effect_and_key_and_value : vec3_to_set) {
 487                         Effect *effect = effect_and_key_and_value.first.first;
 488                         const string &key = effect_and_key_and_value.first.second;
 489                         const float *value = effect_and_key_and_value.second.data();
 490                         if (!effect->set_vec3(key, value)) {
 491                                 luaL_error(L, "Effect refused set_vec3(\"%s\", %f, %f, %f) (invalid key?)", key.c_str(),
 492                                                 value[0], value[1], value[2]);
 493                         }
 494                 }
 495                 for (const auto &effect_and_key_and_value : vec4_to_set) {
 496                         Effect *effect = effect_and_key_and_value.first.first;
 497                         const string &key = effect_and_key_and_value.first.second;
 498                         const float *value = effect_and_key_and_value.second.data();
 499                         if (!effect->set_vec4(key, value)) {
 500                                 luaL_error(L, "Effect refused set_vec4(\"%s\", %f, %f, %f, %f) (invalid key?)", key.c_str(),
 501                                                 value[0], value[1], value[2], value[3]);
 502                         }
 503                 }
 504         };
 505         return make_pair(effect_chain, move(setup_chain));
 506 }
 507
 508 bool display(Block *block, lua_State *L, int idx)
 509 {
 510         if (lua_isnumber(L, idx)) {
 511                 Theme *theme = get_theme_updata(L);
 512                 int signal_idx = luaL_checknumber(L, idx);
 513                 block->signal_type_to_connect = Block::CONNECT_SIGNAL;
 514                 block->signal_to_connect = theme->map_signal(signal_idx);
 515                 block->currently_chosen_alternative = find_index_of(block, LIVE_INPUT_YCBCR);  // Will be changed to deinterlaced at get_chain() time if needed.
 516                 return true;
 517 #ifdef HAVE_CEF
 518         } else if (luaL_testudata(L, idx, "HTMLInput")) {
 519                 CEFCapture *capture = *(CEFCapture **)luaL_checkudata(L, idx, "HTMLInput");
 520                 block->signal_type_to_connect = Block::CONNECT_CEF;
 521                 block->cef_to_connect = capture;
 522                 block->currently_chosen_alternative = find_index_of(block, LIVE_INPUT_BGRA);
 523                 assert(capture->get_current_pixel_format() == bmusb::PixelFormat_8BitBGRA);
 524                 return true;
 525 #endif
 526         } else if (luaL_testudata(L, idx, "VideoInput")) {
 527                 FFmpegCapture *capture = *(FFmpegCapture **)luaL_checkudata(L, idx, "VideoInput");
 528                 block->signal_type_to_connect = Block::CONNECT_VIDEO;
 529                 block->video_to_connect = capture;
 530                 if (capture->get_current_pixel_format() == bmusb::PixelFormat_8BitYCbCrPlanar) {
 531                         block->currently_chosen_alternative = find_index_of(block, LIVE_INPUT_YCBCR_PLANAR);
 532                 } else {
 533                         assert(capture->get_current_pixel_format() == bmusb::PixelFormat_8BitBGRA);
 534                         block->currently_chosen_alternative = find_index_of(block, LIVE_INPUT_BGRA);
 535                 }
 536                 return true;
 537         } else if (luaL_testudata(L, idx, "ImageInput")) {
 538                 ImageInput *image = *(ImageInput **)luaL_checkudata(L, idx, "ImageInput");
 539                 block->signal_type_to_connect = Block::CONNECT_NONE;
 540                 block->currently_chosen_alternative = find_index_of(block, IMAGE_INPUT);
 541                 block->pathname = image->get_pathname();
 542                 return true;
 543         } else {
 544                 return false;
 545         }
 546 }
 547
 548 int Block_display(lua_State* L)
 549 {
 550         assert(lua_gettop(L) == 2);
 551         Block *block = *(Block **)luaL_checkudata(L, 1, "Block");
 552         if (!block->is_input) {
 553                 luaL_error(L, "display() called on something that isn't an input");
 554         }
 555
 556         bool ok = display(block, L, 2);
 557         if (!ok) {
 558                 luaL_error(L, "display() called with something that's not a signal (a signal number, a HTML input, or a VideoInput)");
 559         }
 560
 561         if (block->currently_chosen_alternative == -1) {
 562                 luaL_error(L, "display() called on an input whose type was fixed at construction time, with a signal of different type");
 563         }
 564
 565         return 0;
 566 }
 567
 568 int Block_choose(lua_State* L)
 569 {
 570         assert(lua_gettop(L) == 2);
 571         Block *block = *(Block **)luaL_checkudata(L, 1, "Block");
 572         int alternative_idx = -1;
 573         if (lua_isnumber(L, 2)) {
 574                 alternative_idx = luaL_checknumber(L, 2);
 575         } else if (lua_istable(L, 2)) {
 576                 // See if it's an Effect metatable (e.g. foo:choose(ResampleEffect))
 577                 lua_getfield(L, 2, "__effect_type_id");
 578                 if (lua_isnumber(L, -1)) {
 579                         EffectType effect_type = EffectType(luaL_checknumber(L, -1));
 580                         alternative_idx = find_index_of(block, effect_type);
 581                 }
 582                 lua_pop(L, 1);
 583         }
 584
 585         if (alternative_idx == -1) {
 586                 luaL_error(L, "choose() called with something that was not an index or an effect type (e.g. ResampleEffect) that was part of the alternatives");
 587         }
 588
 589         assert(alternative_idx >= 0);
 590         assert(size_t(alternative_idx) < block->alternatives.size());
 591         block->currently_chosen_alternative = alternative_idx;
 592
 593         return wrap_lua_existing_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", block->alternatives[alternative_idx]);
 594 }
 595
 596 int Block_enable(lua_State *L)
 597 {
 598         assert(lua_gettop(L) == 1);
 599         Block *block = *(Block **)luaL_checkudata(L, 1, "Block");
 600
 601         if (block->alternatives.size() != 2 ||
 602             block->alternatives[1]->effect_type != IDENTITY_EFFECT) {
 603                 luaL_error(L, "enable() called on something that wasn't added with add_optional_effect()");
 604         }
 605         block->currently_chosen_alternative = 0;  // The actual effect.
 606         return 0;
 607 }
 608
 609 int Block_enable_if(lua_State *L)
 610 {
 611         assert(lua_gettop(L) == 2);
 612         Block *block = *(Block **)luaL_checkudata(L, 1, "Block");
 613
 614         if (block->alternatives.size() != 2 ||
 615             block->alternatives[1]->effect_type != IDENTITY_EFFECT) {
 616                 luaL_error(L, "enable_if() called on something that wasn't added with add_optional_effect()");
 617         }
 618         bool enabled = checkbool(L, 2);
 619         block->currently_chosen_alternative = enabled ? 0 : 1;
 620         return 0;
 621 }
 622
 623 int Block_disable(lua_State *L)
 624 {
 625         assert(lua_gettop(L) == 1);
 626         Block *block = *(Block **)luaL_checkudata(L, 1, "Block");
 627
 628         block->currently_chosen_alternative = find_index_of(block, IDENTITY_EFFECT);
 629         if (block->currently_chosen_alternative == -1) {
 630                 luaL_error(L, "disable() called on something that didn't have an IdentityEffect fallback (try add_optional_effect())");
 631         }
 632         assert(block->currently_chosen_alternative != -1);
 633         return 0;
 634 }
 635
 636 int Block_set_int(lua_State *L)
 637 {
 638         assert(lua_gettop(L) == 3);
 639         Block *block = *(Block **)luaL_checkudata(L, 1, "Block");
 640         string key = checkstdstring(L, 2);
 641         float value = luaL_checknumber(L, 3);
 642
 643         // TODO: check validity already here, if possible?
 644         block->int_parameters[key] = value;
 645
 646         return 0;
 647 }
 648
 649 int Block_set_float(lua_State *L)
 650 {
 651         assert(lua_gettop(L) == 3);
 652         Block *block = *(Block **)luaL_checkudata(L, 1, "Block");
 653         string key = checkstdstring(L, 2);
 654         float value = luaL_checknumber(L, 3);
 655
 656         // TODO: check validity already here, if possible?
 657         block->float_parameters[key] = value;
 658
 659         return 0;
 660 }
 661
 662 int Block_set_vec3(lua_State *L)
 663 {
 664         assert(lua_gettop(L) == 5);
 665         Block *block = *(Block **)luaL_checkudata(L, 1, "Block");
 666         string key = checkstdstring(L, 2);
 667         array<float, 3> v;
 668         v[0] = luaL_checknumber(L, 3);
 669         v[1] = luaL_checknumber(L, 4);
 670         v[2] = luaL_checknumber(L, 5);
 671
 672         // TODO: check validity already here, if possible?
 673         block->vec3_parameters[key] = v;
 674
 675         return 0;
 676 }
 677
 678 int Block_set_vec4(lua_State *L)
 679 {
 680         assert(lua_gettop(L) == 6);
 681         Block *block = *(Block **)luaL_checkudata(L, 1, "Block");
 682         string key = checkstdstring(L, 2);
 683         array<float, 4> v;
 684         v[0] = luaL_checknumber(L, 3);
 685         v[1] = luaL_checknumber(L, 4);
 686         v[2] = luaL_checknumber(L, 5);
 687         v[3] = luaL_checknumber(L, 6);
 688
 689         // TODO: check validity already here, if possible?
 690         block->vec4_parameters[key] = v;
 691
 692         return 0;
 693 }
 694