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