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