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

   1 #include "theme.h"
   2
   3 #include <assert.h>
   4 #include <bmusb/bmusb.h>
   5 #include <epoxy/gl.h>
   6 #include <stdarg.h>
   7 #include <lauxlib.h>
   8 #include <lua.hpp>
   9 #include <movit/deinterlace_effect.h>
  10 #include <movit/effect.h>
  11 #include <movit/effect_chain.h>
  12 #include <movit/image_format.h>
  13 #include <movit/input.h>
  14 #include <movit/lift_gamma_gain_effect.h>
  15 #include <movit/mix_effect.h>
  16 #include <movit/multiply_effect.h>
  17 #include <movit/overlay_effect.h>
  18 #include <movit/padding_effect.h>
  19 #include <movit/resample_effect.h>
  20 #include <movit/resize_effect.h>
  21 #include <movit/util.h>
  22 #include <movit/white_balance_effect.h>
  23 #include <movit/ycbcr.h>
  24 #include <movit/ycbcr_input.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <cstddef>
  28 #include <memory>
  29 #include <new>
  30 #include <utility>
  31
  32 #include "audio_mixer.h"
  33 #include "defs.h"
  34 #ifdef HAVE_CEF
  35 #include "cef_capture.h"
  36 #endif
  37 #include "ffmpeg_capture.h"
  38 #include "flags.h"
  39 #include "image_input.h"
  40 #include "input_state.h"
  41 #include "lua_utils.h"
  42 #include "mainwindow.h"
  43 #include "pbo_frame_allocator.h"
  44 #include "scene.h"
  45
  46 class Mixer;
  47
  48 namespace movit {
  49 class ResourcePool;
  50 }  // namespace movit
  51
  52 using namespace std;
  53 using namespace movit;
  54
  55 extern Mixer *global_mixer;
  56
  57 constexpr unsigned Theme::MenuEntry::CHECKABLE;
  58 constexpr unsigned Theme::MenuEntry::CHECKED;
  59
  60 Theme *get_theme_updata(lua_State* L)
  61 {
  62         luaL_checktype(L, lua_upvalueindex(1), LUA_TLIGHTUSERDATA);
  63         return (Theme *)lua_touserdata(L, lua_upvalueindex(1));
  64 }
  65
  66 void print_warning(lua_State* L, const char *format, ...)
  67 {
  68         char buf[4096];
  69         va_list ap;
  70         va_start(ap, format);
  71         vsnprintf(buf, sizeof(buf), format, ap);
  72         va_end(ap);
  73
  74         lua_Debug ar;
  75         lua_getstack(L, 1, &ar);
  76         lua_getinfo(L, "nSl", &ar);
  77         fprintf(stderr, "WARNING: %s:%d: %s", ar.source, ar.currentline, buf);
  78 }
  79
  80 int ThemeMenu_set(lua_State *L)
  81 {
  82         Theme *theme = get_theme_updata(L);
  83         return theme->set_theme_menu(L);
  84 }
  85
  86 InputStateInfo::InputStateInfo(const InputState &input_state)
  87 {
  88         for (unsigned signal_num = 0; signal_num < MAX_VIDEO_CARDS; ++signal_num) {
  89                 BufferedFrame frame = input_state.buffered_frames[signal_num][0];
  90                 if (frame.frame == nullptr) {
  91                         last_width[signal_num] = last_height[signal_num] = 0;
  92                         last_interlaced[signal_num] = false;
  93                         last_has_signal[signal_num] = false;
  94                         last_is_connected[signal_num] = false;
  95                         continue;
  96                 }
  97                 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
  98                 last_width[signal_num] = userdata->last_width[frame.field_number];
  99                 last_height[signal_num] = userdata->last_height[frame.field_number];
 100                 last_interlaced[signal_num] = userdata->last_interlaced;
 101                 last_has_signal[signal_num] = userdata->last_has_signal;
 102                 last_is_connected[signal_num] = userdata->last_is_connected;
 103                 last_frame_rate_nom[signal_num] = userdata->last_frame_rate_nom;
 104                 last_frame_rate_den[signal_num] = userdata->last_frame_rate_den;
 105                 has_last_subtitle[signal_num] = userdata->has_last_subtitle;
 106                 last_subtitle[signal_num] = userdata->last_subtitle;
 107         }
 108 }
 109
 110 // An effect that does nothing.
 111 class IdentityEffect : public Effect {
 112 public:
 113         IdentityEffect() {}
 114         string effect_type_id() const override { return "IdentityEffect"; }
 115         string output_fragment_shader() override { return read_file("identity.frag"); }
 116 };
 117
 118 Effect *instantiate_effect(EffectChain *chain, EffectType effect_type)
 119 {
 120         switch (effect_type) {
 121         case IDENTITY_EFFECT:
 122                 return new IdentityEffect;
 123         case WHITE_BALANCE_EFFECT:
 124         case AUTO_WHITE_BALANCE_EFFECT:
 125                 return new WhiteBalanceEffect;
 126         case RESAMPLE_EFFECT:
 127                 return new ResampleEffect;
 128         case PADDING_EFFECT:
 129                 return new PaddingEffect;
 130         case INTEGRAL_PADDING_EFFECT:
 131                 return new IntegralPaddingEffect;
 132         case OVERLAY_EFFECT:
 133                 return new OverlayEffect;
 134         case RESIZE_EFFECT:
 135                 return new ResizeEffect;
 136         case MULTIPLY_EFFECT:
 137                 return new MultiplyEffect;
 138         case MIX_EFFECT:
 139                 return new MixEffect;
 140         case LIFT_GAMMA_GAIN_EFFECT:
 141                 return new LiftGammaGainEffect;
 142         default:
 143                 fprintf(stderr, "Unhandled effect type %d\n", effect_type);
 144                 abort();
 145         }
 146 }
 147
 148 namespace {
 149
 150 Effect *get_effect_from_blueprint(EffectChain *chain, lua_State *L, int idx)
 151 {
 152         EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, idx, "EffectBlueprint");
 153         if (blueprint->effect != nullptr) {
 154                 luaL_error(L, "An effect can currently only be added to one chain.\n");
 155         }
 156
 157         Effect *effect = instantiate_effect(chain, blueprint->effect_type);
 158
 159         // Set the parameters that were deferred earlier.
 160         for (const auto &kv : blueprint->int_parameters) {
 161                 if (!effect->set_int(kv.first, kv.second)) {
 162                         luaL_error(L, "Effect refused set_int(\"%s\", %d) (invalid key?)", kv.first.c_str(), kv.second);
 163                 }
 164         }
 165         for (const auto &kv : blueprint->float_parameters) {
 166                 if (!effect->set_float(kv.first, kv.second)) {
 167                         luaL_error(L, "Effect refused set_float(\"%s\", %f) (invalid key?)", kv.first.c_str(), kv.second);
 168                 }
 169         }
 170         for (const auto &kv : blueprint->vec3_parameters) {
 171                 if (!effect->set_vec3(kv.first, kv.second.data())) {
 172                         luaL_error(L, "Effect refused set_vec3(\"%s\", %f, %f, %f) (invalid key?)", kv.first.c_str(),
 173                                 kv.second[0], kv.second[1], kv.second[2]);
 174                 }
 175         }
 176         for (const auto &kv : blueprint->vec4_parameters) {
 177                 if (!effect->set_vec4(kv.first, kv.second.data())) {
 178                         luaL_error(L, "Effect refused set_vec4(\"%s\", %f, %f, %f, %f) (invalid key?)", kv.first.c_str(),
 179                                 kv.second[0], kv.second[1], kv.second[2], kv.second[3]);
 180                 }
 181         }
 182         blueprint->effect = effect;
 183         return effect;
 184 }
 185
 186 InputStateInfo *get_input_state_info(lua_State *L, int idx)
 187 {
 188         if (luaL_testudata(L, idx, "InputStateInfo")) {
 189                 return (InputStateInfo *)lua_touserdata(L, idx);
 190         }
 191         luaL_error(L, "Error: Index #%d was not InputStateInfo\n", idx);
 192         return nullptr;
 193 }
 194
 195 }  // namespace
 196
 197 bool checkbool(lua_State* L, int idx)
 198 {
 199         luaL_checktype(L, idx, LUA_TBOOLEAN);
 200         return lua_toboolean(L, idx);
 201 }
 202
 203 string checkstdstring(lua_State *L, int index)
 204 {
 205         size_t len;
 206         const char* cstr = lua_tolstring(L, index, &len);
 207         return string(cstr, len);
 208 }
 209
 210 namespace {
 211
 212 int Scene_new(lua_State* L)
 213 {
 214         assert(lua_gettop(L) == 2);
 215         Theme *theme = get_theme_updata(L);
 216         int aspect_w = luaL_checknumber(L, 1);
 217         int aspect_h = luaL_checknumber(L, 2);
 218
 219         return wrap_lua_object<Scene>(L, "Scene", theme, aspect_w, aspect_h);
 220 }
 221
 222 int Scene_gc(lua_State* L)
 223 {
 224         assert(lua_gettop(L) == 1);
 225         Scene *chain = (Scene *)luaL_checkudata(L, 1, "Scene");
 226         chain->~Scene();
 227         return 0;
 228 }
 229
 230 }  // namespace
 231
 232 void add_outputs_and_finalize(EffectChain *chain, bool is_main_chain)
 233 {
 234         // Add outputs as needed.
 235         // NOTE: If you change any details about the output format, you will need to
 236         // also update what's given to the muxer (HTTPD::Mux constructor) and
 237         // what's put in the H.264 stream (sps_rbsp()).
 238         ImageFormat inout_format;
 239         inout_format.color_space = COLORSPACE_REC_709;
 240
 241         // Output gamma is tricky. We should output Rec. 709 for TV, except that
 242         // we expect to run with web players and others that don't really care and
 243         // just output with no conversion. So that means we'll need to output sRGB,
 244         // even though H.264 has no setting for that (we use “unspecified”).
 245         inout_format.gamma_curve = GAMMA_sRGB;
 246
 247         if (is_main_chain) {
 248                 YCbCrFormat output_ycbcr_format;
 249                 // We actually output 4:2:0 and/or 4:2:2 in the end, but chroma subsampling
 250                 // happens in a pass not run by Movit (see ChromaSubsampler::subsample_chroma()).
 251                 output_ycbcr_format.chroma_subsampling_x = 1;
 252                 output_ycbcr_format.chroma_subsampling_y = 1;
 253
 254                 // This will be overridden if HDMI/SDI output is in force.
 255                 if (global_flags.ycbcr_rec709_coefficients) {
 256                         output_ycbcr_format.luma_coefficients = YCBCR_REC_709;
 257                 } else {
 258                         output_ycbcr_format.luma_coefficients = YCBCR_REC_601;
 259                 }
 260
 261                 output_ycbcr_format.full_range = false;
 262                 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 263
 264                 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 265
 266                 chain->add_ycbcr_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, output_ycbcr_format, YCBCR_OUTPUT_SPLIT_Y_AND_CBCR, type);
 267
 268                 // If we're using zerocopy video encoding (so the destination
 269                 // Y texture is owned by VA-API and will be unavailable for
 270                 // display), add a copy, where we'll only be using the Y component.
 271                 if (global_flags.use_zerocopy) {
 272                         chain->add_ycbcr_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, output_ycbcr_format, YCBCR_OUTPUT_INTERLEAVED, type);  // Add a copy where we'll only be using the Y component.
 273                 }
 274                 chain->set_dither_bits(global_flags.x264_bit_depth > 8 ? 16 : 8);
 275                 chain->set_output_origin(OUTPUT_ORIGIN_TOP_LEFT);
 276         } else {
 277                 chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 278         }
 279
 280         chain->finalize();
 281 }
 282
 283 namespace {
 284
 285 int EffectChain_new(lua_State* L)
 286 {
 287         assert(lua_gettop(L) == 2);
 288         Theme *theme = get_theme_updata(L);
 289         int aspect_w = luaL_checknumber(L, 1);
 290         int aspect_h = luaL_checknumber(L, 2);
 291
 292         return wrap_lua_object<EffectChain>(L, "EffectChain", aspect_w, aspect_h, theme->get_resource_pool());
 293 }
 294
 295 int EffectChain_gc(lua_State* L)
 296 {
 297         assert(lua_gettop(L) == 1);
 298         EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
 299         chain->~EffectChain();
 300         return 0;
 301 }
 302
 303 int EffectChain_add_live_input(lua_State* L)
 304 {
 305         assert(lua_gettop(L) == 3);
 306         Theme *theme = get_theme_updata(L);
 307         EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
 308         bool override_bounce = checkbool(L, 2);
 309         bool deinterlace = checkbool(L, 3);
 310         bmusb::PixelFormat pixel_format = global_flags.ten_bit_input ? bmusb::PixelFormat_10BitYCbCr : bmusb::PixelFormat_8BitYCbCr;
 311
 312         // Needs to be nonowned to match add_video_input (see below).
 313         return wrap_lua_object_nonowned<LiveInputWrapper>(L, "LiveInputWrapper", theme, chain, pixel_format, override_bounce, deinterlace, /*user_connectable=*/true);
 314 }
 315
 316 int EffectChain_add_video_input(lua_State* L)
 317 {
 318         assert(lua_gettop(L) == 3);
 319         Theme *theme = get_theme_updata(L);
 320         EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
 321         FFmpegCapture **capture = (FFmpegCapture **)luaL_checkudata(L, 2, "VideoInput");
 322         bool deinterlace = checkbool(L, 3);
 323
 324         // These need to be nonowned, so that the LiveInputWrapper still exists
 325         // and can feed frames to the right EffectChain even if the Lua code
 326         // doesn't care about the object anymore. (If we change this, we'd need
 327         // to also unregister the signal connection on __gc.)
 328         int ret = wrap_lua_object_nonowned<LiveInputWrapper>(
 329                 L, "LiveInputWrapper", theme, chain, (*capture)->get_current_pixel_format(),
 330                 /*override_bounce=*/false, deinterlace, /*user_connectable=*/false);
 331         if (ret == 1) {
 332                 Theme *theme = get_theme_updata(L);
 333                 LiveInputWrapper **live_input = (LiveInputWrapper **)lua_touserdata(L, -1);
 334                 theme->register_video_signal_connection(chain, *live_input, *capture);
 335         }
 336         return ret;
 337 }
 338
 339 #ifdef HAVE_CEF
 340 int EffectChain_add_html_input(lua_State* L)
 341 {
 342         assert(lua_gettop(L) == 2);
 343         Theme *theme = get_theme_updata(L);
 344         EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
 345         CEFCapture **capture = (CEFCapture **)luaL_checkudata(L, 2, "HTMLInput");
 346
 347         // These need to be nonowned, so that the LiveInputWrapper still exists
 348         // and can feed frames to the right EffectChain even if the Lua code
 349         // doesn't care about the object anymore. (If we change this, we'd need
 350         // to also unregister the signal connection on __gc.)
 351         int ret = wrap_lua_object_nonowned<LiveInputWrapper>(
 352                 L, "LiveInputWrapper", theme, chain, (*capture)->get_current_pixel_format(),
 353                 /*override_bounce=*/false, /*deinterlace=*/false, /*user_connectable=*/false);
 354         if (ret == 1) {
 355                 Theme *theme = get_theme_updata(L);
 356                 LiveInputWrapper **live_input = (LiveInputWrapper **)lua_touserdata(L, -1);
 357                 theme->register_html_signal_connection(chain, *live_input, *capture);
 358         }
 359         return ret;
 360 }
 361 #endif
 362
 363 int EffectChain_add_effect(lua_State* L)
 364 {
 365         assert(lua_gettop(L) >= 2);
 366         EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
 367
 368         // TODO: Better error reporting.
 369         Effect *effect;
 370         if (luaL_testudata(L, 2, "ImageInput")) {
 371                 effect = *(ImageInput **)luaL_checkudata(L, 2, "ImageInput");
 372         } else {
 373                 effect = get_effect_from_blueprint(chain, L, 2);
 374         }
 375         if (lua_gettop(L) == 2) {
 376                 if (effect->num_inputs() == 0) {
 377                         chain->add_input((Input *)effect);
 378                 } else {
 379                         chain->add_effect(effect);
 380                 }
 381         } else {
 382                 vector<Effect *> inputs;
 383                 for (int idx = 3; idx <= lua_gettop(L); ++idx) {
 384                         if (luaL_testudata(L, idx, "LiveInputWrapper")) {
 385                                 LiveInputWrapper **input = (LiveInputWrapper **)lua_touserdata(L, idx);
 386                                 inputs.push_back((*input)->get_effect());
 387                         } else if (luaL_testudata(L, idx, "ImageInput")) {
 388                                 ImageInput *image = *(ImageInput **)luaL_checkudata(L, idx, "ImageInput");
 389                                 inputs.push_back(image);
 390                         } else {
 391                                 EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, idx, "EffectBlueprint");
 392                                 assert(blueprint->effect != nullptr);  // Parent must be added to the graph.
 393                                 inputs.push_back(blueprint->effect);
 394                         }
 395                 }
 396                 chain->add_effect(effect, inputs);
 397         }
 398
 399         lua_settop(L, 2);  // Return the effect itself.
 400
 401         // Make sure Lua doesn't garbage-collect it away.
 402         lua_pushvalue(L, -1);
 403         luaL_ref(L, LUA_REGISTRYINDEX);  // TODO: leak?
 404
 405         return 1;
 406 }
 407
 408 int EffectChain_finalize(lua_State* L)
 409 {
 410         assert(lua_gettop(L) == 2);
 411         EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
 412         bool is_main_chain = checkbool(L, 2);
 413         add_outputs_and_finalize(chain, is_main_chain);
 414         return 0;
 415 }
 416
 417 int LiveInputWrapper_connect_signal(lua_State* L)
 418 {
 419         assert(lua_gettop(L) == 2);
 420         LiveInputWrapper **input = (LiveInputWrapper **)luaL_checkudata(L, 1, "LiveInputWrapper");
 421         int signal_num = luaL_checknumber(L, 2);
 422         bool success = (*input)->connect_signal(signal_num);
 423         if (!success) {
 424                 print_warning(L, "Calling connect_signal() on a video or HTML input. Ignoring.\n");
 425         }
 426         return 0;
 427 }
 428
 429 int ImageInput_new(lua_State* L)
 430 {
 431         assert(lua_gettop(L) == 1);
 432         string filename = checkstdstring(L, 1);
 433         return wrap_lua_object_nonowned<ImageInput>(L, "ImageInput", filename);
 434 }
 435
 436 int VideoInput_new(lua_State* L)
 437 {
 438         assert(lua_gettop(L) == 2);
 439         string filename = checkstdstring(L, 1);
 440         int pixel_format = luaL_checknumber(L, 2);
 441         if (pixel_format != bmusb::PixelFormat_8BitYCbCrPlanar &&
 442             pixel_format != bmusb::PixelFormat_8BitBGRA) {
 443                 print_warning(L, "Invalid enum %d used for video format, choosing Y'CbCr.\n", pixel_format);
 444                 pixel_format = bmusb::PixelFormat_8BitYCbCrPlanar;
 445         }
 446         int ret = wrap_lua_object_nonowned<FFmpegCapture>(L, "VideoInput", filename, global_flags.width, global_flags.height);
 447         if (ret == 1) {
 448                 FFmpegCapture **capture = (FFmpegCapture **)lua_touserdata(L, -1);
 449                 (*capture)->set_pixel_format(bmusb::PixelFormat(pixel_format));
 450
 451                 Theme *theme = get_theme_updata(L);
 452                 theme->register_video_input(*capture);
 453         }
 454         return ret;
 455 }
 456
 457 int VideoInput_rewind(lua_State* L)
 458 {
 459         assert(lua_gettop(L) == 1);
 460         FFmpegCapture **video_input = (FFmpegCapture **)luaL_checkudata(L, 1, "VideoInput");
 461         (*video_input)->rewind();
 462         return 0;
 463 }
 464
 465 int VideoInput_disconnect(lua_State* L)
 466 {
 467         assert(lua_gettop(L) == 1);
 468         FFmpegCapture **video_input = (FFmpegCapture **)luaL_checkudata(L, 1, "VideoInput");
 469         (*video_input)->disconnect();
 470         return 0;
 471 }
 472
 473 int VideoInput_change_rate(lua_State* L)
 474 {
 475         assert(lua_gettop(L) == 2);
 476         FFmpegCapture **video_input = (FFmpegCapture **)luaL_checkudata(L, 1, "VideoInput");
 477         double new_rate = luaL_checknumber(L, 2);
 478         (*video_input)->change_rate(new_rate);
 479         return 0;
 480 }
 481
 482 int VideoInput_get_signal_num(lua_State* L)
 483 {
 484         assert(lua_gettop(L) == 1);
 485         FFmpegCapture **video_input = (FFmpegCapture **)luaL_checkudata(L, 1, "VideoInput");
 486         lua_pushnumber(L, -1 - (*video_input)->get_card_index());
 487         return 1;
 488 }
 489
 490 int HTMLInput_new(lua_State* L)
 491 {
 492 #ifdef HAVE_CEF
 493         assert(lua_gettop(L) == 1);
 494         string url = checkstdstring(L, 1);
 495         int ret = wrap_lua_object_nonowned<CEFCapture>(L, "HTMLInput", url, global_flags.width, global_flags.height);
 496         if (ret == 1) {
 497                 CEFCapture **capture = (CEFCapture **)lua_touserdata(L, -1);
 498                 Theme *theme = get_theme_updata(L);
 499                 theme->register_html_input(*capture);
 500         }
 501         return ret;
 502 #else
 503         fprintf(stderr, "This version of Nageru has been compiled without CEF support.\n");
 504         fprintf(stderr, "HTMLInput is not available.\n");
 505         abort();
 506 #endif
 507 }
 508
 509 #ifdef HAVE_CEF
 510 int HTMLInput_set_url(lua_State* L)
 511 {
 512         assert(lua_gettop(L) == 2);
 513         CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
 514         string new_url = checkstdstring(L, 2);
 515         (*video_input)->set_url(new_url);
 516         return 0;
 517 }
 518
 519 int HTMLInput_reload(lua_State* L)
 520 {
 521         assert(lua_gettop(L) == 1);
 522         CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
 523         (*video_input)->reload();
 524         return 0;
 525 }
 526
 527 int HTMLInput_set_max_fps(lua_State* L)
 528 {
 529         assert(lua_gettop(L) == 2);
 530         CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
 531         int max_fps = lrint(luaL_checknumber(L, 2));
 532         (*video_input)->set_max_fps(max_fps);
 533         return 0;
 534 }
 535
 536 int HTMLInput_execute_javascript_async(lua_State* L)
 537 {
 538         assert(lua_gettop(L) == 2);
 539         CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
 540         string js = checkstdstring(L, 2);
 541         (*video_input)->execute_javascript_async(js);
 542         return 0;
 543 }
 544
 545 int HTMLInput_resize(lua_State* L)
 546 {
 547         assert(lua_gettop(L) == 3);
 548         CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
 549         unsigned width = lrint(luaL_checknumber(L, 2));
 550         unsigned height = lrint(luaL_checknumber(L, 3));
 551         (*video_input)->resize(width, height);
 552         return 0;
 553 }
 554
 555 int HTMLInput_get_signal_num(lua_State* L)
 556 {
 557         assert(lua_gettop(L) == 1);
 558         CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
 559         lua_pushnumber(L, -1 - (*video_input)->get_card_index());
 560         return 1;
 561 }
 562 #endif
 563
 564 int IdentityEffect_new(lua_State* L)
 565 {
 566         assert(lua_gettop(L) == 0);
 567         return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", IDENTITY_EFFECT);
 568 }
 569
 570 int WhiteBalanceEffect_new(lua_State* L)
 571 {
 572         assert(lua_gettop(L) == 0);
 573         return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", WHITE_BALANCE_EFFECT);
 574 }
 575
 576 int ResampleEffect_new(lua_State* L)
 577 {
 578         assert(lua_gettop(L) == 0);
 579         return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", RESAMPLE_EFFECT);
 580 }
 581
 582 int PaddingEffect_new(lua_State* L)
 583 {
 584         assert(lua_gettop(L) == 0);
 585         return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", PADDING_EFFECT);
 586 }
 587
 588 int IntegralPaddingEffect_new(lua_State* L)
 589 {
 590         assert(lua_gettop(L) == 0);
 591         return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", INTEGRAL_PADDING_EFFECT);
 592 }
 593
 594 int OverlayEffect_new(lua_State* L)
 595 {
 596         assert(lua_gettop(L) == 0);
 597         return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", OVERLAY_EFFECT);
 598 }
 599
 600 int ResizeEffect_new(lua_State* L)
 601 {
 602         assert(lua_gettop(L) == 0);
 603         return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", RESIZE_EFFECT);
 604 }
 605
 606 int MultiplyEffect_new(lua_State* L)
 607 {
 608         assert(lua_gettop(L) == 0);
 609         return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", MULTIPLY_EFFECT);
 610 }
 611
 612 int MixEffect_new(lua_State* L)
 613 {
 614         assert(lua_gettop(L) == 0);
 615         return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", MIX_EFFECT);
 616 }
 617
 618 int LiftGammaGainEffect_new(lua_State* L)
 619 {
 620         assert(lua_gettop(L) == 0);
 621         return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", LIFT_GAMMA_GAIN_EFFECT);
 622 }
 623
 624 int InputStateInfo_get_width(lua_State* L)
 625 {
 626         assert(lua_gettop(L) == 2);
 627         InputStateInfo *input_state_info = get_input_state_info(L, 1);
 628
 629         Theme *theme = get_theme_updata(L);
 630         int signal_num = theme->map_signal(luaL_checknumber(L, 2));
 631         lua_pushnumber(L, input_state_info->last_width[signal_num]);
 632         return 1;
 633 }
 634
 635 int InputStateInfo_get_height(lua_State* L)
 636 {
 637         assert(lua_gettop(L) == 2);
 638         InputStateInfo *input_state_info = get_input_state_info(L, 1);
 639         Theme *theme = get_theme_updata(L);
 640         int signal_num = theme->map_signal(luaL_checknumber(L, 2));
 641         lua_pushnumber(L, input_state_info->last_height[signal_num]);
 642         return 1;
 643 }
 644
 645 int InputStateInfo_get_frame_height(lua_State* L)
 646 {
 647         assert(lua_gettop(L) == 2);
 648         InputStateInfo *input_state_info = get_input_state_info(L, 1);
 649         Theme *theme = get_theme_updata(L);
 650         int signal_num = theme->map_signal(luaL_checknumber(L, 2));
 651         unsigned height = input_state_info->last_height[signal_num];
 652         if (input_state_info->last_interlaced[signal_num]) {
 653                 height *= 2;
 654         }
 655         lua_pushnumber(L, height);
 656         return 1;
 657 }
 658
 659 int InputStateInfo_get_interlaced(lua_State* L)
 660 {
 661         assert(lua_gettop(L) == 2);
 662         InputStateInfo *input_state_info = get_input_state_info(L, 1);
 663         Theme *theme = get_theme_updata(L);
 664         int signal_num = theme->map_signal(luaL_checknumber(L, 2));
 665         lua_pushboolean(L, input_state_info->last_interlaced[signal_num]);
 666         return 1;
 667 }
 668
 669 int InputStateInfo_get_has_signal(lua_State* L)
 670 {
 671         assert(lua_gettop(L) == 2);
 672         InputStateInfo *input_state_info = get_input_state_info(L, 1);
 673         Theme *theme = get_theme_updata(L);
 674         int signal_num = theme->map_signal(luaL_checknumber(L, 2));
 675         lua_pushboolean(L, input_state_info->last_has_signal[signal_num]);
 676         return 1;
 677 }
 678
 679 int InputStateInfo_get_is_connected(lua_State* L)
 680 {
 681         assert(lua_gettop(L) == 2);
 682         InputStateInfo *input_state_info = get_input_state_info(L, 1);
 683         Theme *theme = get_theme_updata(L);
 684         int signal_num = theme->map_signal(luaL_checknumber(L, 2));
 685         lua_pushboolean(L, input_state_info->last_is_connected[signal_num]);
 686         return 1;
 687 }
 688
 689 int InputStateInfo_get_frame_rate_nom(lua_State* L)
 690 {
 691         assert(lua_gettop(L) == 2);
 692         InputStateInfo *input_state_info = get_input_state_info(L, 1);
 693         Theme *theme = get_theme_updata(L);
 694         int signal_num = theme->map_signal(luaL_checknumber(L, 2));
 695         lua_pushnumber(L, input_state_info->last_frame_rate_nom[signal_num]);
 696         return 1;
 697 }
 698
 699 int InputStateInfo_get_frame_rate_den(lua_State* L)
 700 {
 701         assert(lua_gettop(L) == 2);
 702         InputStateInfo *input_state_info = get_input_state_info(L, 1);
 703         Theme *theme = get_theme_updata(L);
 704         int signal_num = theme->map_signal(luaL_checknumber(L, 2));
 705         lua_pushnumber(L, input_state_info->last_frame_rate_den[signal_num]);
 706         return 1;
 707 }
 708
 709 int InputStateInfo_get_last_subtitle(lua_State* L)
 710 {
 711         assert(lua_gettop(L) == 2);
 712         InputStateInfo *input_state_info = get_input_state_info(L, 1);
 713         Theme *theme = get_theme_updata(L);
 714         int signal_num = theme->map_signal(luaL_checknumber(L, 2));
 715         if (!input_state_info->has_last_subtitle[signal_num]) {
 716                 lua_pushnil(L);
 717         } else {
 718                 lua_pushstring(L, input_state_info->last_subtitle[signal_num].c_str());
 719         }
 720         return 1;
 721 }
 722
 723 namespace {
 724
 725 // Helper function to write e.g. “60” or “59.94”.
 726 string format_frame_rate(int nom, int den)
 727 {
 728         char buf[256];
 729         if (nom % den == 0) {
 730                 snprintf(buf, sizeof(buf), "%d", nom / den);
 731         } else {
 732                 snprintf(buf, sizeof(buf), "%.2f", double(nom) / den);
 733         }
 734         return buf;
 735 }
 736
 737 // Helper function to write e.g. “720p60”.
 738 string get_human_readable_resolution(const InputStateInfo *input_state_info, int signal_num)
 739 {
 740         char buf[256];
 741         if (input_state_info->last_interlaced[signal_num]) {
 742                 snprintf(buf, sizeof(buf), "%di", input_state_info->last_height[signal_num] * 2);
 743
 744                 // Show field rate instead of frame rate; really for cosmetics only
 745                 // (and actually contrary to EBU recommendations, although in line
 746                 // with typical user expectations).
 747                 return buf + format_frame_rate(input_state_info->last_frame_rate_nom[signal_num] * 2,
 748                         input_state_info->last_frame_rate_den[signal_num]);
 749         } else {
 750                 snprintf(buf, sizeof(buf), "%dp", input_state_info->last_height[signal_num]);
 751                 return buf + format_frame_rate(input_state_info->last_frame_rate_nom[signal_num],
 752                         input_state_info->last_frame_rate_den[signal_num]);
 753         }
 754 }
 755
 756 } // namespace
 757
 758 int InputStateInfo_get_human_readable_resolution(lua_State* L)
 759 {
 760         assert(lua_gettop(L) == 2);
 761         InputStateInfo *input_state_info = get_input_state_info(L, 1);
 762         Theme *theme = get_theme_updata(L);
 763         int signal_num = theme->map_signal(luaL_checknumber(L, 2));
 764
 765         string str;
 766         if (!input_state_info->last_is_connected[signal_num]) {
 767                 str = "disconnected";
 768         } else if (input_state_info->last_height[signal_num] <= 0) {
 769                 str = "no signal";
 770         } else if (!input_state_info->last_has_signal[signal_num]) {
 771                 if (input_state_info->last_height[signal_num] == 525) {
 772                         // Special mode for the USB3 cards.
 773                         str = "no signal";
 774                 } else {
 775                         str = get_human_readable_resolution(input_state_info, signal_num) + ", no signal";
 776                 }
 777         } else {
 778                 str = get_human_readable_resolution(input_state_info, signal_num);
 779         }
 780
 781         lua_pushstring(L, str.c_str());
 782         return 1;
 783 }
 784
 785
 786 int EffectBlueprint_set_int(lua_State *L)
 787 {
 788         assert(lua_gettop(L) == 3);
 789         EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, 1, "EffectBlueprint");
 790         string key = checkstdstring(L, 2);
 791         float value = luaL_checknumber(L, 3);
 792         if (blueprint->effect != nullptr) {
 793                 if (!blueprint->effect->set_int(key, value)) {
 794                         luaL_error(L, "Effect refused set_int(\"%s\", %d) (invalid key?)", key.c_str(), int(value));
 795                 }
 796         } else {
 797                 // TODO: check validity already here, if possible?
 798                 blueprint->int_parameters[key] = value;
 799         }
 800         return 0;
 801 }
 802
 803 int EffectBlueprint_set_float(lua_State *L)
 804 {
 805         assert(lua_gettop(L) == 3);
 806         EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, 1, "EffectBlueprint");
 807         string key = checkstdstring(L, 2);
 808         float value = luaL_checknumber(L, 3);
 809         if (blueprint->effect != nullptr) {
 810                 if (!blueprint->effect->set_float(key, value)) {
 811                         luaL_error(L, "Effect refused set_float(\"%s\", %d) (invalid key?)", key.c_str(), int(value));
 812                 }
 813         } else {
 814                 // TODO: check validity already here, if possible?
 815                 blueprint->float_parameters[key] = value;
 816         }
 817         return 0;
 818 }
 819
 820 int EffectBlueprint_set_vec3(lua_State *L)
 821 {
 822         assert(lua_gettop(L) == 5);
 823         EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, 1, "EffectBlueprint");
 824         string key = checkstdstring(L, 2);
 825         array<float, 3> v;
 826         v[0] = luaL_checknumber(L, 3);
 827         v[1] = luaL_checknumber(L, 4);
 828         v[2] = luaL_checknumber(L, 5);
 829
 830         if (blueprint->effect != nullptr) {
 831                 if (!blueprint->effect->set_vec3(key, v.data())) {
 832                         luaL_error(L, "Effect refused set_vec3(\"%s\", %f, %f, %f) (invalid key?)", key.c_str(),
 833                                 v[0], v[1], v[2]);
 834                 }
 835         } else {
 836                 // TODO: check validity already here, if possible?
 837                 blueprint->vec3_parameters[key] = v;
 838         }
 839
 840         return 0;
 841 }
 842
 843 int EffectBlueprint_set_vec4(lua_State *L)
 844 {
 845         assert(lua_gettop(L) == 6);
 846         EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, 1, "EffectBlueprint");
 847         string key = checkstdstring(L, 2);
 848         array<float, 4> v;
 849         v[0] = luaL_checknumber(L, 3);
 850         v[1] = luaL_checknumber(L, 4);
 851         v[2] = luaL_checknumber(L, 5);
 852         v[3] = luaL_checknumber(L, 6);
 853         if (blueprint->effect != nullptr) {
 854                 if (!blueprint->effect->set_vec4(key, v.data())) {
 855                         luaL_error(L, "Effect refused set_vec4(\"%s\", %f, %f, %f, %f) (invalid key?)", key.c_str(),
 856                                 v[0], v[1], v[2], v[3]);
 857                 }
 858         } else {
 859                 // TODO: check validity already here, if possible?
 860                 blueprint->vec4_parameters[key] = v;
 861         }
 862         return 0;
 863 }
 864
 865 const luaL_Reg Scene_funcs[] = {
 866         { "new", Scene_new },
 867         { "__gc", Scene_gc },
 868         { "add_input", Scene::add_input },
 869         { "add_auto_white_balance", Scene::add_auto_white_balance },
 870         { "add_effect", Scene::add_effect },
 871         { "add_optional_effect", Scene::add_optional_effect },
 872         { "finalize", Scene::finalize },
 873         { NULL, NULL }
 874 };
 875
 876 const luaL_Reg Block_funcs[] = {
 877         { "display", Block_display },
 878         { "choose", Block_choose },
 879         { "enable", Block_enable },
 880         { "enable_if", Block_enable_if },
 881         { "disable", Block_disable },
 882         { "always_disable_if_disabled", Block_always_disable_if_disabled },
 883         { "promise_to_disable_if_enabled", Block_promise_to_disable_if_enabled },
 884         { "set_int", Block_set_int },
 885         { "set_float", Block_set_float },
 886         { "set_vec3", Block_set_vec3 },
 887         { "set_vec4", Block_set_vec4 },
 888         { NULL, NULL }
 889 };
 890
 891 const luaL_Reg EffectBlueprint_funcs[] = {
 892         // NOTE: No new() function; that's for the individual effects.
 893         { "set_int", EffectBlueprint_set_int },
 894         { "set_float", EffectBlueprint_set_float },
 895         { "set_vec3", EffectBlueprint_set_vec3 },
 896         { "set_vec4", EffectBlueprint_set_vec4 },
 897         { NULL, NULL }
 898 };
 899
 900 const luaL_Reg EffectChain_funcs[] = {
 901         { "new", EffectChain_new },
 902         { "__gc", EffectChain_gc },
 903         { "add_live_input", EffectChain_add_live_input },
 904         { "add_video_input", EffectChain_add_video_input },
 905 #ifdef HAVE_CEF
 906         { "add_html_input", EffectChain_add_html_input },
 907 #endif
 908         { "add_effect", EffectChain_add_effect },
 909         { "finalize", EffectChain_finalize },
 910         { NULL, NULL }
 911 };
 912
 913 const luaL_Reg LiveInputWrapper_funcs[] = {
 914         { "connect_signal", LiveInputWrapper_connect_signal },
 915         { NULL, NULL }
 916 };
 917
 918 const luaL_Reg ImageInput_funcs[] = {
 919         { "new", ImageInput_new },
 920         { NULL, NULL }
 921 };
 922
 923 const luaL_Reg VideoInput_funcs[] = {
 924         { "new", VideoInput_new },
 925         { "rewind", VideoInput_rewind },
 926         { "disconnect", VideoInput_disconnect },
 927         { "change_rate", VideoInput_change_rate },
 928         { "get_signal_num", VideoInput_get_signal_num },
 929         { NULL, NULL }
 930 };
 931
 932 const luaL_Reg HTMLInput_funcs[] = {
 933         { "new", HTMLInput_new },
 934 #ifdef HAVE_CEF
 935         { "set_url", HTMLInput_set_url },
 936         { "reload", HTMLInput_reload },
 937         { "set_max_fps", HTMLInput_set_max_fps },
 938         { "execute_javascript_async", HTMLInput_execute_javascript_async },
 939         { "resize", HTMLInput_resize },
 940         { "get_signal_num", HTMLInput_get_signal_num },
 941 #endif
 942         { NULL, NULL }
 943 };
 944
 945 // Effects.
 946 // All of these are solely for new(); the returned metatable will be that of
 947 // EffectBlueprint, and Effect (returned from add_effect()) is its own type.
 948
 949 const luaL_Reg IdentityEffect_funcs[] = {
 950         { "new", IdentityEffect_new },
 951         { NULL, NULL }
 952 };
 953
 954 const luaL_Reg WhiteBalanceEffect_funcs[] = {
 955         { "new", WhiteBalanceEffect_new },
 956         { NULL, NULL }
 957 };
 958
 959 const luaL_Reg ResampleEffect_funcs[] = {
 960         { "new", ResampleEffect_new },
 961         { NULL, NULL }
 962 };
 963
 964 const luaL_Reg PaddingEffect_funcs[] = {
 965         { "new", PaddingEffect_new },
 966         { NULL, NULL }
 967 };
 968
 969 const luaL_Reg IntegralPaddingEffect_funcs[] = {
 970         { "new", IntegralPaddingEffect_new },
 971         { NULL, NULL }
 972 };
 973
 974 const luaL_Reg OverlayEffect_funcs[] = {
 975         { "new", OverlayEffect_new },
 976         { NULL, NULL }
 977 };
 978
 979 const luaL_Reg ResizeEffect_funcs[] = {
 980         { "new", ResizeEffect_new },
 981         { NULL, NULL }
 982 };
 983
 984 const luaL_Reg MultiplyEffect_funcs[] = {
 985         { "new", MultiplyEffect_new },
 986         { NULL, NULL }
 987 };
 988
 989 const luaL_Reg MixEffect_funcs[] = {
 990         { "new", MixEffect_new },
 991         { NULL, NULL }
 992 };
 993
 994 const luaL_Reg LiftGammaGainEffect_funcs[] = {
 995         { "new", LiftGammaGainEffect_new },
 996         { NULL, NULL }
 997 };
 998
 999 // End of effects.
1000
1001 const luaL_Reg InputStateInfo_funcs[] = {
1002         { "get_width", InputStateInfo_get_width },
1003         { "get_height", InputStateInfo_get_height },
1004         { "get_frame_width", InputStateInfo_get_width },  // Same as get_width().
1005         { "get_frame_height", InputStateInfo_get_frame_height },
1006         { "get_interlaced", InputStateInfo_get_interlaced },
1007         { "get_has_signal", InputStateInfo_get_has_signal },
1008         { "get_is_connected", InputStateInfo_get_is_connected },
1009         { "get_frame_rate_nom", InputStateInfo_get_frame_rate_nom },
1010         { "get_frame_rate_den", InputStateInfo_get_frame_rate_den },
1011         { "get_last_subtitle", InputStateInfo_get_last_subtitle },
1012         { "get_human_readable_resolution", InputStateInfo_get_human_readable_resolution },
1013         { NULL, NULL }
1014 };
1015
1016 const luaL_Reg ThemeMenu_funcs[] = {
1017         { "set", ThemeMenu_set },
1018         { NULL, NULL }
1019 };
1020
1021 }  // namespace
1022
1023 LiveInputWrapper::LiveInputWrapper(
1024         Theme *theme,
1025         EffectChain *chain,
1026         bmusb::PixelFormat pixel_format,
1027         bool override_bounce,
1028         bool deinterlace,
1029         bool user_connectable)
1030         : theme(theme),
1031           pixel_format(pixel_format),
1032           deinterlace(deinterlace),
1033           user_connectable(user_connectable)
1034 {
1035         ImageFormat inout_format;
1036         inout_format.color_space = COLORSPACE_sRGB;
1037
1038         // Gamma curve depends on the input signal, and we don't really get any
1039         // indications. A camera would be expected to do Rec. 709, but
1040         // I haven't checked if any do in practice. However, computers _do_ output
1041         // in sRGB gamma (ie., they don't convert from sRGB to Rec. 709), and
1042         // I wouldn't really be surprised if most non-professional cameras do, too.
1043         // So we pick sRGB as the least evil here.
1044         inout_format.gamma_curve = GAMMA_sRGB;
1045
1046         unsigned num_inputs;
1047         if (deinterlace) {
1048                 deinterlace_effect = new movit::DeinterlaceEffect();
1049
1050                 // As per the comments in deinterlace_effect.h, we turn this off.
1051                 // The most likely interlaced input for us is either a camera
1052                 // (where it's fine to turn it off) or a laptop (where it _should_
1053                 // be turned off).
1054                 CHECK(deinterlace_effect->set_int("enable_spatial_interlacing_check", 0));
1055
1056                 num_inputs = deinterlace_effect->num_inputs();
1057                 assert(num_inputs == FRAME_HISTORY_LENGTH);
1058         } else {
1059                 num_inputs = 1;
1060         }
1061
1062         if (pixel_format == bmusb::PixelFormat_8BitBGRA) {
1063                 for (unsigned i = 0; i < num_inputs; ++i) {
1064                         // We upload our textures ourselves, and Movit swaps
1065                         // R and B in the shader if we specify BGRA, so lie and say RGBA.
1066                         rgba_inputs.push_back(new sRGBSwitchingFlatInput(inout_format, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, GL_UNSIGNED_BYTE, global_flags.width, global_flags.height));
1067                         chain->add_input(rgba_inputs.back());
1068                 }
1069
1070                 if (deinterlace) {
1071                         vector<Effect *> reverse_inputs(rgba_inputs.rbegin(), rgba_inputs.rend());
1072                         chain->add_effect(deinterlace_effect, reverse_inputs);
1073                 }
1074         } else {
1075                 assert(pixel_format == bmusb::PixelFormat_8BitYCbCr ||
1076                        pixel_format == bmusb::PixelFormat_10BitYCbCr ||
1077                        pixel_format == bmusb::PixelFormat_8BitYCbCrPlanar);
1078
1079                 // Most of these settings will be overridden later if using PixelFormat_8BitYCbCrPlanar.
1080                 input_ycbcr_format.chroma_subsampling_x = (pixel_format == bmusb::PixelFormat_10BitYCbCr) ? 1 : 2;
1081                 input_ycbcr_format.chroma_subsampling_y = 1;
1082                 input_ycbcr_format.num_levels = (pixel_format == bmusb::PixelFormat_10BitYCbCr) ? 1024 : 256;
1083                 input_ycbcr_format.cb_x_position = 0.0;
1084                 input_ycbcr_format.cr_x_position = 0.0;
1085                 input_ycbcr_format.cb_y_position = 0.5;
1086                 input_ycbcr_format.cr_y_position = 0.5;
1087                 input_ycbcr_format.luma_coefficients = YCBCR_REC_709;  // Will be overridden later even if not planar.
1088                 input_ycbcr_format.full_range = false;  // Will be overridden later even if not planar.
1089
1090                 for (unsigned i = 0; i < num_inputs; ++i) {
1091                         // When using 10-bit input, we're converting to interleaved through v210Converter.
1092                         YCbCrInputSplitting splitting;
1093                         if (pixel_format == bmusb::PixelFormat_10BitYCbCr) {
1094                                 splitting = YCBCR_INPUT_INTERLEAVED;
1095                         } else if (pixel_format == bmusb::PixelFormat_8BitYCbCr) {
1096                                 splitting = YCBCR_INPUT_SPLIT_Y_AND_CBCR;
1097                         } else {
1098                                 splitting = YCBCR_INPUT_PLANAR;
1099                         }
1100                         if (override_bounce) {
1101                                 ycbcr_inputs.push_back(new NonBouncingYCbCrInput(inout_format, input_ycbcr_format, global_flags.width, global_flags.height, splitting));
1102                         } else {
1103                                 ycbcr_inputs.push_back(new YCbCrInput(inout_format, input_ycbcr_format, global_flags.width, global_flags.height, splitting));
1104                         }
1105                         chain->add_input(ycbcr_inputs.back());
1106                 }
1107
1108                 if (deinterlace) {
1109                         vector<Effect *> reverse_inputs(ycbcr_inputs.rbegin(), ycbcr_inputs.rend());
1110                         chain->add_effect(deinterlace_effect, reverse_inputs);
1111                 }
1112         }
1113 }
1114
1115 bool LiveInputWrapper::connect_signal(int signal_num)
1116 {
1117         if (!user_connectable) {
1118                 return false;
1119         }
1120
1121         if (global_mixer == nullptr) {
1122                 // No data yet.
1123                 return true;
1124         }
1125
1126         signal_num = theme->map_signal(signal_num);
1127         connect_signal_raw(signal_num, *theme->input_state);
1128         return true;
1129 }
1130
1131 void LiveInputWrapper::connect_signal_raw(int signal_num, const InputState &input_state)
1132 {
1133         BufferedFrame first_frame = input_state.buffered_frames[signal_num][0];
1134         if (first_frame.frame == nullptr) {
1135                 // No data yet.
1136                 return;
1137         }
1138         unsigned width, height;
1139         {
1140                 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)first_frame.frame->userdata;
1141                 width = userdata->last_width[first_frame.field_number];
1142                 height = userdata->last_height[first_frame.field_number];
1143                 if (userdata->last_interlaced) {
1144                         height *= 2;
1145                 }
1146         }
1147
1148         movit::YCbCrLumaCoefficients ycbcr_coefficients = input_state.ycbcr_coefficients[signal_num];
1149         bool full_range = input_state.full_range[signal_num];
1150
1151         if (input_state.ycbcr_coefficients_auto[signal_num]) {
1152                 full_range = false;
1153
1154                 // The Blackmagic driver docs claim that the device outputs Y'CbCr
1155                 // according to Rec. 601, but this seems to indicate the subsampling
1156                 // positions only, as they publish Y'CbCr → RGB formulas that are
1157                 // different for HD and SD (corresponding to Rec. 709 and 601, respectively),
1158                 // and a Lenovo X1 gen 3 I used to test definitely outputs Rec. 709
1159                 // (at least up to rounding error). Other devices seem to use Rec. 601
1160                 // even on HD resolutions. Nevertheless, Rec. 709 _is_ the right choice
1161                 // for HD, so we default to that if the user hasn't set anything.
1162                 if (height >= 720) {
1163                         ycbcr_coefficients = YCBCR_REC_709;
1164                 } else {
1165                         ycbcr_coefficients = YCBCR_REC_601;
1166                 }
1167         }
1168
1169         // This is a global, but it doesn't really matter.
1170         input_ycbcr_format.luma_coefficients = ycbcr_coefficients;
1171         input_ycbcr_format.full_range = full_range;
1172
1173         BufferedFrame last_good_frame = first_frame;
1174         for (unsigned i = 0; i < max(ycbcr_inputs.size(), rgba_inputs.size()); ++i) {
1175                 BufferedFrame frame = input_state.buffered_frames[signal_num][i];
1176                 if (frame.frame == nullptr) {
1177                         // Not enough data; reuse last frame (well, field).
1178                         // This is suboptimal, but we have nothing better.
1179                         frame = last_good_frame;
1180                 }
1181                 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
1182
1183                 unsigned this_width = userdata->last_width[frame.field_number];
1184                 unsigned this_height = userdata->last_height[frame.field_number];
1185                 if (this_width != width || this_height != height) {
1186                         // Resolution changed; reuse last frame/field.
1187                         frame = last_good_frame;
1188                         userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
1189                 }
1190
1191                 assert(userdata->pixel_format == pixel_format);
1192                 switch (pixel_format) {
1193                 case bmusb::PixelFormat_8BitYCbCr:
1194                         ycbcr_inputs[i]->set_texture_num(0, userdata->tex_y[frame.field_number]);
1195                         ycbcr_inputs[i]->set_texture_num(1, userdata->tex_cbcr[frame.field_number]);
1196                         ycbcr_inputs[i]->change_ycbcr_format(input_ycbcr_format);
1197                         ycbcr_inputs[i]->set_width(width);
1198                         ycbcr_inputs[i]->set_height(height);
1199                         break;
1200                 case bmusb::PixelFormat_8BitYCbCrPlanar:
1201                         ycbcr_inputs[i]->set_texture_num(0, userdata->tex_y[frame.field_number]);
1202                         ycbcr_inputs[i]->set_texture_num(1, userdata->tex_cb[frame.field_number]);
1203                         ycbcr_inputs[i]->set_texture_num(2, userdata->tex_cr[frame.field_number]);
1204                         ycbcr_inputs[i]->change_ycbcr_format(userdata->ycbcr_format);
1205                         ycbcr_inputs[i]->set_width(width);
1206                         ycbcr_inputs[i]->set_height(height);
1207                         break;
1208                 case bmusb::PixelFormat_10BitYCbCr:
1209                         ycbcr_inputs[i]->set_texture_num(0, userdata->tex_444[frame.field_number]);
1210                         ycbcr_inputs[i]->change_ycbcr_format(input_ycbcr_format);
1211                         ycbcr_inputs[i]->set_width(width);
1212                         ycbcr_inputs[i]->set_height(height);
1213                         break;
1214                 case bmusb::PixelFormat_8BitBGRA:
1215                         rgba_inputs[i]->set_texture_num(userdata->tex_rgba[frame.field_number]);
1216                         rgba_inputs[i]->set_width(width);
1217                         rgba_inputs[i]->set_height(height);
1218                         break;
1219                 default:
1220                         assert(false);
1221                 }
1222
1223                 last_good_frame = frame;
1224         }
1225
1226         if (deinterlace) {
1227                 BufferedFrame frame = input_state.buffered_frames[signal_num][0];
1228                 CHECK(deinterlace_effect->set_int("current_field_position", frame.field_number));
1229         }
1230 }
1231
1232 namespace {
1233
1234 int call_num_channels(lua_State *L)
1235 {
1236         lua_getglobal(L, "num_channels");
1237
1238         if (lua_pcall(L, 0, 1, 0) != 0) {
1239                 fprintf(stderr, "error running function `num_channels': %s\n", lua_tostring(L, -1));
1240                 fprintf(stderr, "Try Nageru.set_num_channels(...) at the start of the script instead.\n");
1241                 abort();
1242         }
1243
1244         int num_channels = luaL_checknumber(L, 1);
1245         lua_pop(L, 1);
1246         assert(lua_gettop(L) == 0);
1247         return num_channels;
1248 }
1249
1250 }  // namespace
1251
1252 int Nageru_set_channel_name(lua_State *L)
1253 {
1254         // NOTE: m is already locked.
1255         Theme *theme = get_theme_updata(L);
1256         unsigned channel = luaL_checknumber(L, 1);
1257         const string text = checkstdstring(L, 2);
1258         theme->channel_names[channel] = text;
1259         lua_pop(L, 2);
1260         return 0;
1261 }
1262
1263 int Nageru_set_num_channels(lua_State *L)
1264 {
1265         // NOTE: m is already locked.
1266         Theme *theme = get_theme_updata(L);
1267         if (theme->startup_finished) {
1268                 luaL_error(L, "set_num_channels() can only be called at startup.");
1269         }
1270         theme->num_channels = luaL_checknumber(L, 1);
1271         lua_pop(L, 1);
1272         return 0;
1273 }
1274
1275 int Nageru_set_channel_signal(lua_State *L)
1276 {
1277         // NOTE: m is already locked.
1278         Theme *theme = get_theme_updata(L);
1279         if (theme->startup_finished) {
1280                 luaL_error(L, "set_channel_signal() can only be called at startup.");
1281         }
1282         unsigned channel = luaL_checknumber(L, 1);
1283         int signal = luaL_checknumber(L, 2);
1284         theme->channel_signals[channel] = signal;
1285         lua_pop(L, 2);
1286         return 0;
1287 }
1288
1289 int Nageru_set_supports_wb(lua_State *L)
1290 {
1291         // NOTE: m is already locked.
1292         Theme *theme = get_theme_updata(L);
1293         if (theme->startup_finished) {
1294                 luaL_error(L, "set_supports_wb() can only be called at startup.");
1295         }
1296         unsigned channel = luaL_checknumber(L, 1);
1297         bool supports_wb = checkbool(L, 2);
1298         theme->channel_supports_wb[channel] = supports_wb;
1299         lua_pop(L, 2);
1300         return 0;
1301 }
1302
1303 // NOTE: There's a race condition in all of the audio functions; if the mapping
1304 // is changed by the user underway, you might not be manipulating the bus you
1305 // expect. (You should not get crashes, though.) There's not all that much we
1306 // can do about it, short of locking the entire mixer while anything from the
1307 // theme runs.
1308
1309 int Nageru_get_num_audio_buses(lua_State *L)
1310 {
1311         if (global_audio_mixer == nullptr) {
1312                 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1313                 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1314         }
1315         lua_pushinteger(L, global_audio_mixer->num_buses());
1316         return 1;
1317 }
1318
1319 int Nageru_get_audio_bus_name(lua_State *L)
1320 {
1321         if (global_audio_mixer == nullptr) {
1322                 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1323                 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1324         }
1325         int bus_index = luaL_checknumber(L, 1);
1326         InputMapping input_mapping = global_audio_mixer->get_input_mapping();
1327         if (bus_index < 0 || size_t(bus_index) >= input_mapping.buses.size()) {
1328                 // Doesn't fix the race, but fixes other out-of-bounds.
1329                 print_warning(L, "Theme called get_audio_bus_name() on nonexistent bus %d; returning nil.\n", bus_index);
1330                 lua_pushnil(L);
1331         } else {
1332                 lua_pushstring(L, input_mapping.buses[bus_index].name.c_str());
1333         }
1334         return 1;
1335 }
1336
1337 int Nageru_get_audio_bus_fader_level_db(lua_State *L)
1338 {
1339         if (global_audio_mixer == nullptr) {
1340                 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1341                 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1342         }
1343
1344         int bus_index = luaL_checknumber(L, 1);
1345         if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
1346                 // Doesn't fix the race, but fixes other out-of-bounds.
1347                 print_warning(L, "Theme called get_audio_bus_fader_level_db() on nonexistent bus %d; returning 0.0.\n", bus_index);
1348                 lua_pushnumber(L, 0.0);
1349         } else {
1350                 lua_pushnumber(L, global_audio_mixer->get_fader_volume(bus_index));
1351         }
1352         return 1;
1353 }
1354
1355 int Nageru_set_audio_bus_fader_level_db(lua_State *L)
1356 {
1357         if (global_audio_mixer == nullptr || global_mainwindow == nullptr) {
1358                 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1359                 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1360         }
1361
1362         int bus_index = luaL_checknumber(L, 1);
1363         if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
1364                 // Doesn't fix the race, but fixes other out-of-bounds.
1365                 print_warning(L, "Theme called set_audio_bus_fader_level_db() on nonexistent bus %d; ignoring.\n", bus_index);
1366                 return 0;
1367         }
1368         double level_db = luaL_checknumber(L, 2);
1369
1370         // Go through the UI, so that it gets updated.
1371         global_mainwindow->set_fader_absolute(bus_index, level_db);
1372         return 0;
1373 }
1374
1375 int Nageru_get_audio_bus_mute(lua_State *L)
1376 {
1377         if (global_audio_mixer == nullptr) {
1378                 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1379                 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1380         }
1381
1382         int bus_index = luaL_checknumber(L, 1);
1383         if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
1384                 // Doesn't fix the race, but fixes other out-of-bounds.
1385                 print_warning(L, "Theme called get_audio_bus_mute() on nonexistent bus %d; returning false.\n", bus_index);
1386                 lua_pushboolean(L, false);
1387         } else {
1388                 lua_pushboolean(L, global_audio_mixer->get_mute(bus_index));
1389         }
1390         return 1;
1391 }
1392
1393 int Nageru_set_audio_bus_mute(lua_State *L)
1394 {
1395         if (global_audio_mixer == nullptr || global_mainwindow == nullptr) {
1396                 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1397                 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1398         }
1399
1400         int bus_index = luaL_checknumber(L, 1);
1401         if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
1402                 // Doesn't fix the race, but fixes other out-of-bounds.
1403                 print_warning(L, "Theme called set_audio_bus_mute() on nonexistent bus %d; ignoring.\n", bus_index);
1404                 return 0;
1405         }
1406         bool mute = checkbool(L, 2);
1407
1408         // Go through the UI, so that it gets updated.
1409         if (mute != global_audio_mixer->get_mute(bus_index)) {
1410                 global_mainwindow->toggle_mute(bus_index);
1411         }
1412         return 0;
1413 }
1414
1415 Theme::Theme(const string &filename, const vector<string> &search_dirs, ResourcePool *resource_pool, unsigned num_cards)
1416         : resource_pool(resource_pool), num_cards(num_cards), signal_to_card_mapping(global_flags.default_stream_mapping)
1417 {
1418         // Defaults.
1419         channel_names[0] = "Live";
1420         channel_names[1] = "Preview";
1421
1422         L = luaL_newstate();
1423         luaL_openlibs(L);
1424
1425         // Search through all directories until we find a file that will load
1426         // (as in, does not return LUA_ERRFILE); then run it. We store load errors
1427         // from all the attempts, and show them once we know we can't find any of them.
1428         lua_settop(L, 0);
1429         vector<string> errors;
1430         bool success = false;
1431
1432         vector<string> real_search_dirs;
1433         if (!filename.empty() && filename[0] == '/') {
1434                 real_search_dirs.push_back("");
1435         } else {
1436                 real_search_dirs = search_dirs;
1437         }
1438
1439         string path;
1440         int theme_code_ref;
1441         for (const string &dir : real_search_dirs) {
1442                 if (dir.empty()) {
1443                         path = filename;
1444                 } else {
1445                         path = dir + "/" + filename;
1446                 }
1447                 int err = luaL_loadfile(L, path.c_str());
1448                 if (err == 0) {
1449                         // Save the theme for when we're actually going to run it
1450                         // (we need to set up the right environment below first,
1451                         // and we couldn't do that before, because we didn't know the
1452                         // path to put in Nageru.THEME_PATH).
1453                         theme_code_ref = luaL_ref(L, LUA_REGISTRYINDEX);
1454                         assert(lua_gettop(L) == 0);
1455
1456                         success = true;
1457                         break;
1458                 }
1459                 errors.push_back(lua_tostring(L, -1));
1460                 lua_pop(L, 1);
1461                 if (err != LUA_ERRFILE) {
1462                         // The file actually loaded, but failed to parse somehow. Abort; don't try the next one.
1463                         break;
1464                 }
1465         }
1466
1467         if (!success) {
1468                 for (const string &error : errors) {
1469                         fprintf(stderr, "%s\n", error.c_str());
1470                 }
1471                 abort();
1472         }
1473         assert(lua_gettop(L) == 0);
1474
1475         // Make sure the path exposed to the theme (as Nageru.THEME_PATH;
1476         // can be useful for locating files when talking to CEF) is absolute.
1477         // In a sense, it would be nice if realpath() had a mode not to
1478         // resolve symlinks, but it doesn't, so we only call it if we don't
1479         // already have an absolute path (which may leave ../ elements etc.).
1480         if (path[0] == '/') {
1481                 theme_path = path;
1482         } else {
1483                 char *absolute_theme_path = realpath(path.c_str(), nullptr);
1484                 theme_path = absolute_theme_path;
1485                 free(absolute_theme_path);
1486         }
1487
1488         // Set up the API we provide.
1489         register_globals();
1490         register_class("Scene", Scene_funcs);
1491         register_class("Block", Block_funcs);
1492         register_class("EffectBlueprint", EffectBlueprint_funcs);
1493         register_class("EffectChain", EffectChain_funcs);
1494         register_class("LiveInputWrapper", LiveInputWrapper_funcs);
1495         register_class("ImageInput", ImageInput_funcs);
1496         register_class("VideoInput", VideoInput_funcs);
1497         register_class("HTMLInput", HTMLInput_funcs);
1498         register_class("IdentityEffect", IdentityEffect_funcs, IDENTITY_EFFECT);
1499         register_class("WhiteBalanceEffect", WhiteBalanceEffect_funcs, WHITE_BALANCE_EFFECT);
1500         register_class("ResampleEffect", ResampleEffect_funcs, RESAMPLE_EFFECT);
1501         register_class("PaddingEffect", PaddingEffect_funcs, PADDING_EFFECT);
1502         register_class("IntegralPaddingEffect", IntegralPaddingEffect_funcs, INTEGRAL_PADDING_EFFECT);
1503         register_class("OverlayEffect", OverlayEffect_funcs, OVERLAY_EFFECT);
1504         register_class("ResizeEffect", ResizeEffect_funcs, RESIZE_EFFECT);
1505         register_class("MultiplyEffect", MultiplyEffect_funcs, MULTIPLY_EFFECT);
1506         register_class("MixEffect", MixEffect_funcs, MIX_EFFECT);
1507         register_class("LiftGammaGainEffect", LiftGammaGainEffect_funcs, LIFT_GAMMA_GAIN_EFFECT);
1508         register_class("InputStateInfo", InputStateInfo_funcs);
1509         register_class("ThemeMenu", ThemeMenu_funcs);
1510
1511         // Now actually run the theme to get everything set up.
1512         lua_rawgeti(L, LUA_REGISTRYINDEX, theme_code_ref);
1513         luaL_unref(L, LUA_REGISTRYINDEX, theme_code_ref);
1514         if (lua_pcall(L, 0, 0, 0)) {
1515                 fprintf(stderr, "Error when running %s: %s\n", path.c_str(), lua_tostring(L, -1));
1516                 abort();
1517         }
1518         assert(lua_gettop(L) == 0);
1519
1520         if (num_channels == -1) {
1521                 // Ask it for the number of channels.
1522                 num_channels = call_num_channels(L);
1523         }
1524         startup_finished = true;
1525 }
1526
1527 Theme::~Theme()
1528 {
1529         theme_menu.reset();
1530         lua_close(L);
1531 }
1532
1533 void Theme::register_globals()
1534 {
1535         // Set Nageru.VIDEO_FORMAT_BGRA = bmusb::PixelFormat_8BitBGRA, etc.
1536         const vector<pair<string, int>> num_constants = {
1537                 { "VIDEO_FORMAT_BGRA", bmusb::PixelFormat_8BitBGRA },
1538                 { "VIDEO_FORMAT_YCBCR", bmusb::PixelFormat_8BitYCbCrPlanar },
1539                 { "CHECKABLE", MenuEntry::CHECKABLE },
1540                 { "CHECKED", MenuEntry::CHECKED },
1541         };
1542         const vector<pair<string, string>> str_constants = {
1543                 { "THEME_PATH", theme_path },
1544         };
1545
1546         lua_newtable(L);  // t = {}
1547
1548         for (const pair<string, int> &constant : num_constants) {
1549                 lua_pushstring(L, constant.first.c_str());
1550                 lua_pushinteger(L, constant.second);
1551                 lua_settable(L, 1);  // t[key] = value
1552         }
1553         for (const pair<string, string> &constant : str_constants) {
1554                 lua_pushstring(L, constant.first.c_str());
1555                 lua_pushstring(L, constant.second.c_str());
1556                 lua_settable(L, 1);  // t[key] = value
1557         }
1558
1559         const luaL_Reg Nageru_funcs[] = {
1560                 // Channel information.
1561                 { "set_channel_name", Nageru_set_channel_name },
1562                 { "set_num_channels", Nageru_set_num_channels },
1563                 { "set_channel_signal", Nageru_set_channel_signal },
1564                 { "set_supports_wb", Nageru_set_supports_wb },
1565
1566                 // Audio.
1567                 { "get_num_audio_buses", Nageru_get_num_audio_buses },
1568                 { "get_audio_bus_name", Nageru_get_audio_bus_name },
1569                 { "get_audio_bus_fader_level_db", Nageru_get_audio_bus_fader_level_db },
1570                 { "set_audio_bus_fader_level_db", Nageru_set_audio_bus_fader_level_db },
1571                 { "get_audio_bus_mute", Nageru_get_audio_bus_mute },
1572                 { "set_audio_bus_mute", Nageru_set_audio_bus_mute },
1573
1574                 { nullptr, nullptr }
1575         };
1576         lua_pushlightuserdata(L, this);
1577         luaL_setfuncs(L, Nageru_funcs, 1);        // for (name,f in funcs) { mt[name] = f, with upvalue {theme} }
1578
1579         lua_setglobal(L, "Nageru");  // Nageru = t
1580         assert(lua_gettop(L) == 0);
1581 }
1582
1583 void Theme::register_class(const char *class_name, const luaL_Reg *funcs, EffectType effect_type)
1584 {
1585         assert(lua_gettop(L) == 0);
1586         luaL_newmetatable(L, class_name);  // mt = {}
1587         lua_pushlightuserdata(L, this);
1588         luaL_setfuncs(L, funcs, 1);        // for (name,f in funcs) { mt[name] = f, with upvalue {theme} }
1589         lua_pushvalue(L, -1);
1590         lua_setfield(L, -2, "__index");    // mt.__index = mt
1591         if (effect_type != NO_EFFECT_TYPE) {
1592                 lua_pushnumber(L, effect_type);
1593                 lua_setfield(L, -2, "__effect_type_id");  // mt.__effect_type_id = effect_type
1594         }
1595         lua_setglobal(L, class_name);      // ClassName = mt
1596         assert(lua_gettop(L) == 0);
1597 }
1598
1599 Theme::Chain Theme::get_chain_from_effect_chain(EffectChain *effect_chain, unsigned num, const InputState &input_state)
1600 {
1601         if (!lua_isfunction(L, -1)) {
1602                 fprintf(stderr, "Argument #-1 should be a function\n");
1603                 abort();
1604         }
1605         lua_pushvalue(L, -1);
1606         shared_ptr<LuaRefWithDeleter> funcref(new LuaRefWithDeleter(&m, L, luaL_ref(L, LUA_REGISTRYINDEX)));
1607         lua_pop(L, 2);
1608
1609         Chain chain;
1610         chain.chain = effect_chain;
1611         chain.setup_chain = [this, funcref, input_state, effect_chain]{
1612                 lock_guard<mutex> lock(m);
1613
1614                 assert(this->input_state == nullptr);
1615                 this->input_state = &input_state;
1616
1617                 // Set up state, including connecting signals.
1618                 lua_rawgeti(L, LUA_REGISTRYINDEX, funcref->get());
1619                 if (lua_pcall(L, 0, 0, 0) != 0) {
1620                         fprintf(stderr, "error running chain setup callback: %s\n", lua_tostring(L, -1));
1621                         abort();
1622                 }
1623                 assert(lua_gettop(L) == 0);
1624
1625                 // The theme can't (or at least shouldn't!) call connect_signal() on
1626                 // each FFmpeg or CEF input, so we'll do it here.
1627                 if (video_signal_connections.count(effect_chain)) {
1628                         for (const VideoSignalConnection &conn : video_signal_connections[effect_chain]) {
1629                                 conn.wrapper->connect_signal_raw(conn.source->get_card_index(), input_state);
1630                         }
1631                 }
1632 #ifdef HAVE_CEF
1633                 if (html_signal_connections.count(effect_chain)) {
1634                         for (const CEFSignalConnection &conn : html_signal_connections[effect_chain]) {
1635                                 conn.wrapper->connect_signal_raw(conn.source->get_card_index(), input_state);
1636                         }
1637                 }
1638 #endif
1639
1640                 this->input_state = nullptr;
1641         };
1642         return chain;
1643 }
1644
1645 Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned height, const InputState &input_state)
1646 {
1647         const char *func_name = "get_scene";  // For error reporting.
1648         Chain chain;
1649
1650         lock_guard<mutex> lock(m);
1651         assert(lua_gettop(L) == 0);
1652         lua_getglobal(L, "get_scene");  /* function to be called */
1653         if (lua_isnil(L, -1)) {
1654                 // Try the pre-1.9.0 name for compatibility.
1655                 lua_pop(L, 1);
1656                 lua_getglobal(L, "get_chain");
1657                 func_name = "get_chain";
1658         }
1659         lua_pushnumber(L, num);
1660         lua_pushnumber(L, t);
1661         lua_pushnumber(L, width);
1662         lua_pushnumber(L, height);
1663         wrap_lua_object<InputStateInfo>(L, "InputStateInfo", input_state);
1664
1665         if (lua_pcall(L, 5, LUA_MULTRET, 0) != 0) {
1666                 fprintf(stderr, "error running function “%s”: %s\n", func_name, lua_tostring(L, -1));
1667                 abort();
1668         }
1669
1670         if (luaL_testudata(L, -1, "Scene") != nullptr) {
1671                 if (lua_gettop(L) != 1) {
1672                         luaL_error(L, "%s() for chain number %d returned an Scene, but also other items", func_name);
1673                 }
1674                 Scene *auto_effect_chain = (Scene *)luaL_testudata(L, -1, "Scene");
1675                 auto chain_and_setup = auto_effect_chain->get_chain(this, L, num, input_state);
1676                 chain.chain = chain_and_setup.first;
1677                 chain.setup_chain = move(chain_and_setup.second);
1678         } else if (luaL_testudata(L, -2, "EffectChain") != nullptr) {
1679                 // Old-style (pre-Nageru 1.9.0) return of a single chain and prepare function.
1680                 if (lua_gettop(L) != 2) {
1681                         luaL_error(L, "%s() for chain number %d returned an EffectChain, but needs to also return a prepare function (or use Scene)", func_name);
1682                 }
1683                 EffectChain *effect_chain = (EffectChain *)luaL_testudata(L, -2, "EffectChain");
1684                 chain = get_chain_from_effect_chain(effect_chain, num, input_state);
1685         } else {
1686                 luaL_error(L, "%s() for chain number %d did not return an EffectChain or Scene\n", func_name, num);
1687         }
1688         assert(lua_gettop(L) == 0);
1689
1690         // TODO: Can we do better, e.g. by running setup_chain() and seeing what it references?
1691         // Actually, setup_chain does maybe hold all the references we need now anyway?
1692         chain.input_frames.reserve(num_cards * FRAME_HISTORY_LENGTH);
1693         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1694                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
1695                         chain.input_frames.push_back(input_state.buffered_frames[card_index][frame_num].frame);
1696                 }
1697         }
1698
1699         return chain;
1700 }
1701
1702 string Theme::get_channel_name(unsigned channel)
1703 {
1704         lock_guard<mutex> lock(m);
1705
1706         // We never ask the legacy channel_name() about live and preview.
1707         // The defaults are set in our constructor.
1708         if (channel == 0 || channel == 1) {
1709                 return channel_names[channel];
1710         }
1711
1712         lua_getglobal(L, "channel_name");
1713         if (lua_isnil(L, -1)) {
1714                 lua_pop(L, 1);
1715                 if (channel_names.count(channel)) {
1716                         return channel_names[channel];
1717                 } else {
1718                         return "(no title)";
1719                 }
1720         }
1721
1722         lua_pushnumber(L, channel);
1723         if (lua_pcall(L, 1, 1, 0) != 0) {
1724                 fprintf(stderr, "error running function `channel_name': %s\n", lua_tostring(L, -1));
1725                 abort();
1726         }
1727         const char *ret = lua_tostring(L, -1);
1728         if (ret == nullptr) {
1729                 fprintf(stderr, "function `channel_name' returned nil for channel %d\n", channel);
1730                 fprintf(stderr, "Try Nageru.set_channel_name(channel, name) at the start of the script instead.\n");
1731                 abort();
1732         }
1733
1734         string retstr = ret;
1735         lua_pop(L, 1);
1736         assert(lua_gettop(L) == 0);
1737         return retstr;
1738 }
1739
1740 int Theme::get_channel_signal(unsigned channel)
1741 {
1742         lock_guard<mutex> lock(m);
1743         lua_getglobal(L, "channel_signal");
1744         if (lua_isnil(L, -1)) {
1745                 lua_pop(L, 1);
1746                 if (channel_signals.count(channel)) {
1747                         return channel_signals[channel];
1748                 } else {
1749                         return -1;
1750                 }
1751         }
1752
1753         lua_pushnumber(L, channel);
1754         if (lua_pcall(L, 1, 1, 0) != 0) {
1755                 fprintf(stderr, "error running function `channel_signal': %s\n", lua_tostring(L, -1));
1756                 fprintf(stderr, "Try Nageru.set_channel_signal(channel, signal) at the start of the script instead.\n");
1757                 abort();
1758         }
1759
1760         int ret = luaL_checknumber(L, 1);
1761         lua_pop(L, 1);
1762         assert(lua_gettop(L) == 0);
1763         return ret;
1764 }
1765
1766 std::string Theme::get_channel_color(unsigned channel)
1767 {
1768         lock_guard<mutex> lock(m);
1769         lua_getglobal(L, "channel_color");
1770         lua_pushnumber(L, channel);
1771         if (lua_pcall(L, 1, 1, 0) != 0) {
1772                 fprintf(stderr, "error running function `channel_color': %s\n", lua_tostring(L, -1));
1773                 abort();
1774         }
1775
1776         const char *ret = lua_tostring(L, -1);
1777         if (ret == nullptr) {
1778                 fprintf(stderr, "function `channel_color' returned nil for channel %d\n", channel);
1779                 abort();
1780         }
1781
1782         string retstr = ret;
1783         lua_pop(L, 1);
1784         assert(lua_gettop(L) == 0);
1785         return retstr;
1786 }
1787
1788 bool Theme::get_supports_set_wb(unsigned channel)
1789 {
1790         lock_guard<mutex> lock(m);
1791         lua_getglobal(L, "supports_set_wb");
1792         if (lua_isnil(L, -1)) {
1793                 lua_pop(L, 1);
1794                 if (channel_supports_wb.count(channel)) {
1795                         return channel_supports_wb[channel];
1796                 } else {
1797                         return false;
1798                 }
1799         }
1800
1801         lua_pushnumber(L, channel);
1802         if (lua_pcall(L, 1, 1, 0) != 0) {
1803                 fprintf(stderr, "error running function `supports_set_wb': %s\n", lua_tostring(L, -1));
1804                 fprintf(stderr, "Try Nageru.set_supports_wb(channel, bool) at the start of the script instead.\n");
1805                 abort();
1806         }
1807
1808         bool ret = checkbool(L, -1);
1809         lua_pop(L, 1);
1810         assert(lua_gettop(L) == 0);
1811         return ret;
1812 }
1813
1814 void Theme::set_wb(unsigned channel, float r, float g, float b)
1815 {
1816         int signal = get_channel_signal(channel);
1817
1818         lock_guard<mutex> lock(m);
1819         if (signal != -1) {
1820                 white_balance_for_signal[signal] = RGBTriplet{ r, g, b };
1821         }
1822
1823         call_lua_wb_callback(channel, r, g, b);
1824 }
1825
1826 void Theme::set_wb_for_signal(int signal, float r, float g, float b)
1827 {
1828         lock_guard<mutex> lock(m);
1829         white_balance_for_signal[signal] = RGBTriplet{ r, g, b };
1830
1831         for (const auto &channel_and_signal : channel_signals) {
1832                 if (channel_and_signal.second == signal) {
1833                         call_lua_wb_callback(channel_and_signal.first, r, g, b);
1834                 }
1835         }
1836 }
1837
1838 void Theme::call_lua_wb_callback(unsigned channel, float r, float g, float b)
1839 {
1840         lua_getglobal(L, "set_wb");
1841         if (lua_isnil(L, -1)) {
1842                 // The function doesn't exist, to just ignore. We've stored the white balance,
1843                 // and most likely, it will be picked up by auto white balance instead.
1844                 lua_pop(L, 1);
1845                 return;
1846         }
1847         lua_pushnumber(L, channel);
1848         lua_pushnumber(L, r);
1849         lua_pushnumber(L, g);
1850         lua_pushnumber(L, b);
1851         if (lua_pcall(L, 4, 0, 0) != 0) {
1852                 fprintf(stderr, "error running function `set_wb': %s\n", lua_tostring(L, -1));
1853                 abort();
1854         }
1855
1856         assert(lua_gettop(L) == 0);
1857 }
1858
1859 RGBTriplet Theme::get_white_balance_for_signal(int signal)
1860 {
1861         if (white_balance_for_signal.count(signal)) {
1862                 return white_balance_for_signal[signal];
1863         } else {
1864                 return RGBTriplet{ 1.0, 1.0, 1.0 };
1865         }
1866 }
1867
1868 vector<string> Theme::get_transition_names(float t)
1869 {
1870         lock_guard<mutex> lock(m);
1871         lua_getglobal(L, "get_transitions");
1872         lua_pushnumber(L, t);
1873         if (lua_pcall(L, 1, 1, 0) != 0) {
1874                 fprintf(stderr, "error running function `get_transitions': %s\n", lua_tostring(L, -1));
1875                 abort();
1876         }
1877
1878         vector<string> ret;
1879         lua_pushnil(L);
1880         while (lua_next(L, -2) != 0) {
1881                 ret.push_back(lua_tostring(L, -1));
1882                 lua_pop(L, 1);
1883         }
1884         lua_pop(L, 1);
1885         assert(lua_gettop(L) == 0);
1886         return ret;
1887 }
1888
1889 int Theme::map_signal(int signal_num)
1890 {
1891         // Negative numbers map to raw signals.
1892         if (signal_num < 0) {
1893                 return -1 - signal_num;
1894         }
1895
1896         lock_guard<mutex> lock(map_m);
1897         if (signal_to_card_mapping.count(signal_num)) {
1898                 return signal_to_card_mapping[signal_num];
1899         }
1900
1901         int card_index;
1902         if (global_flags.output_card != -1 && num_cards > 1) {
1903                 // Try to exclude the output card from the default card_index.
1904                 card_index = signal_num % (num_cards - 1);
1905                 if (card_index >= global_flags.output_card) {
1906                          ++card_index;
1907                 }
1908                 if (signal_num >= int(num_cards - 1)) {
1909                         print_warning(L, "Theme asked for input %d, but we only have %u input card(s) (card %d is busy with output).\n",
1910                                 signal_num, num_cards - 1, global_flags.output_card);
1911                         fprintf(stderr, "Mapping to card %d instead.\n", card_index);
1912                 }
1913         } else {
1914                 card_index = signal_num % num_cards;
1915                 if (signal_num >= int(num_cards)) {
1916                         print_warning(L, "Theme asked for input %d, but we only have %u card(s).\n", signal_num, num_cards);
1917                         fprintf(stderr, "Mapping to card %d instead.\n", card_index);
1918                 }
1919         }
1920         signal_to_card_mapping[signal_num] = card_index;
1921         return card_index;
1922 }
1923
1924 void Theme::set_signal_mapping(int signal_num, int card_num)
1925 {
1926         lock_guard<mutex> lock(map_m);
1927         assert(card_num < int(num_cards));
1928         signal_to_card_mapping[signal_num] = card_num;
1929 }
1930
1931 void Theme::transition_clicked(int transition_num, float t)
1932 {
1933         lock_guard<mutex> lock(m);
1934         lua_getglobal(L, "transition_clicked");
1935         lua_pushnumber(L, transition_num);
1936         lua_pushnumber(L, t);
1937
1938         if (lua_pcall(L, 2, 0, 0) != 0) {
1939                 fprintf(stderr, "error running function `transition_clicked': %s\n", lua_tostring(L, -1));
1940                 abort();
1941         }
1942         assert(lua_gettop(L) == 0);
1943 }
1944
1945 void Theme::channel_clicked(int preview_num)
1946 {
1947         lock_guard<mutex> lock(m);
1948         lua_getglobal(L, "channel_clicked");
1949         lua_pushnumber(L, preview_num);
1950
1951         if (lua_pcall(L, 1, 0, 0) != 0) {
1952                 fprintf(stderr, "error running function `channel_clicked': %s\n", lua_tostring(L, -1));
1953                 abort();
1954         }
1955         assert(lua_gettop(L) == 0);
1956 }
1957
1958 template <class T>
1959 void destroy(T &ref)
1960 {
1961         ref.~T();
1962 }
1963
1964 Theme::MenuEntry::~MenuEntry()
1965 {
1966         if (is_submenu) {
1967                 destroy(submenu);
1968         } else {
1969                 luaL_unref(entry.L, LUA_REGISTRYINDEX, entry.lua_ref);
1970         }
1971 }
1972
1973 namespace {
1974
1975 vector<unique_ptr<Theme::MenuEntry>> create_recursive_theme_menu(lua_State *L);
1976
1977 unique_ptr<Theme::MenuEntry> create_theme_menu_entry(lua_State *L, int index)
1978 {
1979         unique_ptr<Theme::MenuEntry> entry;
1980
1981         lua_rawgeti(L, index, 1);
1982         const string text = checkstdstring(L, -1);
1983         lua_pop(L, 1);
1984
1985         unsigned flags = 0;
1986         if (lua_objlen(L, -1) > 2) {
1987                 lua_rawgeti(L, -1, 3);
1988                 flags = luaL_checknumber(L, -1);
1989                 lua_pop(L, 1);
1990         }
1991
1992         lua_rawgeti(L, index, 2);
1993         if (lua_istable(L, -1)) {
1994                 vector<unique_ptr<Theme::MenuEntry>> submenu = create_recursive_theme_menu(L);
1995                 entry.reset(new Theme::MenuEntry{ text, move(submenu) });
1996                 lua_pop(L, 1);
1997         } else {
1998                 luaL_checktype(L, -1, LUA_TFUNCTION);
1999                 int ref = luaL_ref(L, LUA_REGISTRYINDEX);
2000                 entry.reset(new Theme::MenuEntry{ text, L, ref, flags });
2001         }
2002         return entry;
2003 }
2004
2005 vector<unique_ptr<Theme::MenuEntry>> create_recursive_theme_menu(lua_State *L)
2006 {
2007         vector<unique_ptr<Theme::MenuEntry>> menu;
2008         size_t num_elements = lua_objlen(L, -1);
2009         for (size_t i = 1; i <= num_elements; ++i) {
2010                 lua_rawgeti(L, -1, i);
2011                 menu.emplace_back(create_theme_menu_entry(L, -1));
2012                 lua_pop(L, 1);
2013         }
2014         return menu;
2015 }
2016
2017 }  // namespace
2018
2019 int Theme::set_theme_menu(lua_State *L)
2020 {
2021         theme_menu.reset();
2022
2023         vector<unique_ptr<MenuEntry>> root_menu;
2024         int num_elements = lua_gettop(L);
2025         for (int i = 1; i <= num_elements; ++i) {
2026                 root_menu.emplace_back(create_theme_menu_entry(L, i));
2027         }
2028         theme_menu.reset(new MenuEntry("", move(root_menu)));
2029
2030         lua_pop(L, num_elements);
2031         assert(lua_gettop(L) == 0);
2032
2033         if (theme_menu_callback != nullptr) {
2034                 theme_menu_callback();
2035         }
2036
2037         return 0;
2038 }
2039
2040 void Theme::theme_menu_entry_clicked(int lua_ref)
2041 {
2042         lock_guard<mutex> lock(m);
2043         lua_rawgeti(L, LUA_REGISTRYINDEX, lua_ref);
2044         if (lua_pcall(L, 0, 0, 0) != 0) {
2045                 fprintf(stderr, "error running menu callback: %s\n", lua_tostring(L, -1));
2046                 abort();
2047         }
2048 }
2049
2050 string Theme::format_status_line(const string &disk_space_left_text, double file_length_seconds)
2051 {
2052         lock_guard<mutex> lock(m);
2053         lua_getglobal(L, "format_status_line");
2054         if (lua_isnil(L, -1)) {
2055                 lua_pop(L, 1);
2056                 return disk_space_left_text;
2057         }
2058
2059         lua_pushstring(L, disk_space_left_text.c_str());
2060         lua_pushnumber(L, file_length_seconds);
2061         if (lua_pcall(L, 2, 1, 0) != 0) {
2062                 fprintf(stderr, "error running function format_status_line(): %s\n", lua_tostring(L, -1));
2063                 abort();
2064         }
2065         string text = checkstdstring(L, 1);
2066         lua_pop(L, 1);
2067         assert(lua_gettop(L) == 0);
2068         return text;
2069 }