git.sesse.net Git - casparcg/blob - core/producer/scene/scene_producer.cpp

   1 /*
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   6 * CasparCG is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation, either version 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * CasparCG is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * Author: Helge Norberg, helge.norberg@svt.se
  20 */
  21
  22 #include "../../StdAfx.h"
  23
  24 #include <common/future.h>
  25 #include <common/prec_timer.h>
  26
  27 #include <boost/algorithm/string/split.hpp>
  28 #include <boost/algorithm/string.hpp>
  29
  30 #include "scene_producer.h"
  31
  32 #include "../../frame/draw_frame.h"
  33 #include "../../interaction/interaction_aggregator.h"
  34 #include "../text/text_producer.h"
  35
  36 namespace caspar { namespace core { namespace scene {
  37
  38 layer::layer(const std::wstring& name, const spl::shared_ptr<frame_producer>& producer)
  39         : name(name), producer(producer)
  40 {
  41         crop.lower_right.x.bind(producer.get()->pixel_constraints().width);
  42         crop.lower_right.y.bind(producer.get()->pixel_constraints().height);
  43         perspective.upper_right.x.bind(producer.get()->pixel_constraints().width);
  44         perspective.lower_right.x.bind(producer.get()->pixel_constraints().width);
  45         perspective.lower_right.y.bind(producer.get()->pixel_constraints().height);
  46         perspective.lower_left.y.bind(producer.get()->pixel_constraints().height);
  47 }
  48
  49 adjustments::adjustments()
  50         : opacity(1.0)
  51 {
  52 }
  53
  54 struct timeline
  55 {
  56         std::map<int64_t, keyframe> keyframes;
  57
  58         void on_frame(int64_t frame)
  59         {
  60                 auto before = --keyframes.upper_bound(frame);
  61                 bool found_before = before != keyframes.end() && before->first < frame;
  62                 auto after = keyframes.upper_bound(frame);
  63                 bool found_after = after != keyframes.end() && after->first > frame;
  64                 auto exact_frame = keyframes.find(frame);
  65                 bool found_exact_frame = exact_frame != keyframes.end();
  66
  67                 if (found_exact_frame)
  68                 {
  69                         exact_frame->second.on_destination_frame();
  70
  71                         auto next_frame = ++exact_frame;
  72
  73                         if (next_frame != keyframes.end() && next_frame->second.on_start_animate)
  74                                 next_frame->second.on_start_animate();
  75                 }
  76                 else if (found_after)
  77                 {
  78                         int64_t start_frame = 0;
  79
  80                         if (found_before)
  81                         {
  82                                 start_frame = before->first;
  83                         }
  84
  85                         if (after->second.on_start_animate && frame == 0)
  86                                 after->second.on_start_animate();
  87                         else if (after->second.on_animate_to)
  88                                 after->second.on_animate_to(start_frame, frame);
  89                 }
  90         }
  91 };
  92
  93 mark_action get_mark_action(const std::wstring& name)
  94 {
  95         if (name == L"start")
  96                 return mark_action::start;
  97         else if (name == L"stop")
  98                 return mark_action::stop;
  99         else if (name == L"jump_to")
 100                 return mark_action::jump_to;
 101         else if (name == L"remove")
 102                 return mark_action::remove;
 103         else
 104                 CASPAR_THROW_EXCEPTION(user_error() << msg_info(L"Invalid mark_action " + name));
 105 }
 106
 107 struct marker
 108 {
 109         mark_action             action;
 110         std::wstring    label_argument;
 111
 112         marker(mark_action action, const std::wstring& label_argument)
 113                 : action(action)
 114                 , label_argument(label_argument)
 115         {
 116         }
 117 };
 118
 119 struct scene_producer::impl
 120 {
 121         std::wstring                                                                                    producer_name_;
 122         constraints                                                                                             pixel_constraints_;
 123         video_format_desc                                                                               format_desc_;
 124         std::list<layer>                                                                                layers_;
 125         interaction_aggregator                                                                  aggregator_;
 126         binding<double>                                                                                 frame_number_;
 127         binding<int64_t>                                                                                timeline_frame_number_;
 128         binding<double>                                                                                 speed_;
 129         mutable tbb::atomic<int64_t>                                                    m_x_;
 130         mutable tbb::atomic<int64_t>                                                    m_y_;
 131         binding<int64_t>                                                                                mouse_x_;
 132         binding<int64_t>                                                                                mouse_y_;
 133         double                                                                                                  frame_fraction_         = 0.0;
 134         std::map<void*, timeline>                                                               timelines_;
 135         std::map<std::wstring, std::shared_ptr<core::variable>> variables_;
 136         std::vector<std::wstring>                                                               variable_names_;
 137         std::multimap<int64_t, marker>                                                  markers_by_frame_;
 138         monitor::subject                                                                                monitor_subject_;
 139         bool                                                                                                    paused_                         = true;
 140         bool                                                                                                    removed_                        = false;
 141         bool                                                                                                    going_to_mark_          = false;
 142
 143         impl(std::wstring producer_name, int width, int height, const video_format_desc& format_desc)
 144                 : producer_name_(std::move(producer_name))
 145                 , pixel_constraints_(width, height)
 146                 , format_desc_(format_desc)
 147                 , aggregator_([=] (double x, double y) { return collission_detect(x, y); })
 148         {
 149                 auto speed_variable = std::make_shared<core::variable_impl<double>>(L"1.0", true, 1.0);
 150                 store_variable(L"scene_speed", speed_variable);
 151                 speed_ = speed_variable->value();
 152
 153                 auto frame_variable = std::make_shared<core::variable_impl<double>>(L"-1", true, -1);
 154                 store_variable(L"frame", frame_variable);
 155                 frame_number_ = frame_variable->value();
 156
 157                 auto timeline_frame_variable = std::make_shared<core::variable_impl<int64_t>>(L"-1", false, -1);
 158                 store_variable(L"timeline_frame", timeline_frame_variable);
 159                 timeline_frame_number_ = timeline_frame_variable->value();
 160
 161                 auto mouse_x_variable = std::make_shared<core::variable_impl<int64_t>>(L"0", false, 0);
 162                 auto mouse_y_variable = std::make_shared<core::variable_impl<int64_t>>(L"0", false, 0);
 163                 store_variable(L"mouse_x", mouse_x_variable);
 164                 store_variable(L"mouse_y", mouse_y_variable);
 165                 mouse_x_ = mouse_x_variable->value();
 166                 mouse_y_ = mouse_y_variable->value();
 167                 m_x_ = 0;
 168                 m_y_ = 0;
 169         }
 170
 171         layer& create_layer(
 172                         const spl::shared_ptr<frame_producer>& producer, int x, int y, const std::wstring& name)
 173         {
 174                 layer layer(name, producer);
 175
 176                 layer.position.x.set(x);
 177                 layer.position.y.set(y);
 178
 179                 layers_.push_back(layer);
 180
 181                 return layers_.back();
 182         }
 183
 184         void reverse_layers() {
 185                 layers_.reverse();
 186         }
 187
 188         void store_keyframe(void* timeline_identity, const keyframe& k)
 189         {
 190                 timelines_[timeline_identity].keyframes.insert(std::make_pair(k.destination_frame, k));
 191         }
 192
 193         void store_variable(
 194                         const std::wstring& name, const std::shared_ptr<core::variable>& var)
 195         {
 196                 variables_.insert(std::make_pair(name, var));
 197                 variable_names_.push_back(name);
 198         }
 199
 200         void add_mark(int64_t frame, mark_action action, const std::wstring& label)
 201         {
 202                 markers_by_frame_.insert(std::make_pair(frame, marker(action, label)));
 203         }
 204
 205         core::variable& get_variable(const std::wstring& name)
 206         {
 207                 auto found = variables_.find(name);
 208
 209                 if (found == variables_.end())
 210                         CASPAR_THROW_EXCEPTION(user_error() << msg_info(name + L" not found in scene"));
 211
 212                 return *found->second;
 213         }
 214
 215         const std::vector<std::wstring>& get_variables() const
 216         {
 217                 return variable_names_;
 218         }
 219
 220         binding<int64_t> timeline_frame()
 221         {
 222                 return timeline_frame_number_;
 223         }
 224
 225         frame_transform get_transform(const layer& layer) const
 226         {
 227                 frame_transform transform;
 228
 229                 auto& anchor            = transform.image_transform.anchor;
 230                 auto& pos                       = transform.image_transform.fill_translation;
 231                 auto& scale                     = transform.image_transform.fill_scale;
 232                 auto& angle                     = transform.image_transform.angle;
 233                 auto& crop                      = transform.image_transform.crop;
 234                 auto& pers                      = transform.image_transform.perspective;
 235
 236                 anchor[0]       = layer.anchor.x.get()                                                                          / layer.producer.get()->pixel_constraints().width.get();
 237                 anchor[1]       = layer.anchor.y.get()                                                                          / layer.producer.get()->pixel_constraints().height.get();
 238                 pos[0]          = layer.position.x.get()                                                                        / pixel_constraints_.width.get();
 239                 pos[1]          = layer.position.y.get()                                                                        / pixel_constraints_.height.get();
 240                 scale[0]        = layer.producer.get()->pixel_constraints().width.get()         / pixel_constraints_.width.get();
 241                 scale[1]        = layer.producer.get()->pixel_constraints().height.get()        / pixel_constraints_.height.get();
 242                 crop.ul[0]      = layer.crop.upper_left.x.get()                                                         / layer.producer.get()->pixel_constraints().width.get();
 243                 crop.ul[1]      = layer.crop.upper_left.y.get()                                                         / layer.producer.get()->pixel_constraints().height.get();
 244                 crop.lr[0]      = layer.crop.lower_right.x.get()                                                        / layer.producer.get()->pixel_constraints().width.get();
 245                 crop.lr[1]      = layer.crop.lower_right.y.get()                                                        / layer.producer.get()->pixel_constraints().height.get();
 246                 pers.ul[0]      = layer.perspective.upper_left.x.get()                                          / layer.producer.get()->pixel_constraints().width.get();
 247                 pers.ul[1]      = layer.perspective.upper_left.y.get()                                          / layer.producer.get()->pixel_constraints().height.get();
 248                 pers.ur[0]      = layer.perspective.upper_right.x.get()                                         / layer.producer.get()->pixel_constraints().width.get();
 249                 pers.ur[1]      = layer.perspective.upper_right.y.get()                                         / layer.producer.get()->pixel_constraints().height.get();
 250                 pers.lr[0]      = layer.perspective.lower_right.x.get()                                         / layer.producer.get()->pixel_constraints().width.get();
 251                 pers.lr[1]      = layer.perspective.lower_right.y.get()                                         / layer.producer.get()->pixel_constraints().height.get();
 252                 pers.ll[0]      = layer.perspective.lower_left.x.get()                                          / layer.producer.get()->pixel_constraints().width.get();
 253                 pers.ll[1]      = layer.perspective.lower_left.y.get()                                          / layer.producer.get()->pixel_constraints().height.get();
 254
 255                 static const double PI = 3.141592653589793;
 256
 257                 angle           = layer.rotation.get() * PI / 180.0;
 258
 259                 transform.image_transform.opacity                       = layer.adjustments.opacity.get();
 260                 transform.image_transform.is_key                        = layer.is_key.get();
 261                 transform.image_transform.use_mipmap            = layer.use_mipmap.get();
 262                 transform.image_transform.blend_mode            = layer.blend_mode.get();
 263                 transform.image_transform.chroma.key            = layer.chroma_key.key.get();
 264                 transform.image_transform.chroma.threshold      = layer.chroma_key.threshold.get();
 265                 transform.image_transform.chroma.softness       = layer.chroma_key.softness.get();
 266                 transform.image_transform.chroma.spill          = layer.chroma_key.spill.get();
 267
 268                 // Mark as sublayer, so it will be composited separately by the mixer.
 269                 transform.image_transform.layer_depth = 1;
 270
 271                 return transform;
 272         }
 273
 274         boost::optional<std::pair<int64_t, marker>> find_first_stop_or_jump_or_remove(int64_t start_frame, int64_t end_frame)
 275         {
 276                 auto lower = markers_by_frame_.lower_bound(start_frame);
 277                 auto upper = markers_by_frame_.upper_bound(end_frame);
 278
 279                 if (lower == markers_by_frame_.end())
 280                         return boost::none;
 281
 282                 for (auto iter = lower; iter != upper; ++iter)
 283                 {
 284                         auto action = iter->second.action;
 285
 286                         if (action == mark_action::stop || action == mark_action::jump_to || action == mark_action::remove)
 287                                 return std::make_pair(iter->first, iter->second);
 288                 }
 289
 290                 return boost::none;
 291         }
 292
 293         boost::optional<std::pair<int64_t, marker>> find_first_start(int64_t start_frame)
 294         {
 295                 auto lower = markers_by_frame_.lower_bound(start_frame);
 296
 297                 if (lower == markers_by_frame_.end())
 298                         return boost::none;
 299
 300                 for (auto iter = lower; iter != markers_by_frame_.end(); ++iter)
 301                 {
 302                         auto action = iter->second.action;
 303
 304                         if (action == mark_action::start)
 305                                 return std::make_pair(iter->first, iter->second);
 306                 }
 307
 308                 return boost::none;
 309         }
 310
 311         draw_frame render_frame()
 312         {
 313                 if (format_desc_.field_count == 1)
 314                         return render_progressive_frame();
 315                 else
 316                 {
 317                         prec_timer timer;
 318                         timer.tick_millis(0);
 319
 320                         auto field1 = render_progressive_frame();
 321
 322                         timer.tick(0.5 / format_desc_.fps);
 323
 324                         auto field2 = render_progressive_frame();
 325
 326                         return draw_frame::interlace(field1, field2, format_desc_.field_mode);
 327                 }
 328         }
 329
 330         void advance()
 331         {
 332                 frame_fraction_ += speed_.get();
 333
 334                 if (std::abs(frame_fraction_) >= 1.0)
 335                 {
 336                         int64_t delta = static_cast<int64_t>(frame_fraction_);
 337                         auto previous_frame = timeline_frame_number_.get();
 338                         auto next_frame = timeline_frame_number_.get() + delta;
 339                         auto marker = find_first_stop_or_jump_or_remove(previous_frame + 1, next_frame);
 340
 341                         if (marker && marker->second.action == mark_action::remove)
 342                         {
 343                                 remove();
 344                         }
 345                         if (marker && !going_to_mark_)
 346                         {
 347                                 if (marker->second.action == mark_action::stop)
 348                                 {
 349                                         timeline_frame_number_.set(marker->first);
 350                                         frame_fraction_ = 0.0;
 351                                         paused_ = true;
 352                                 }
 353                                 else if (marker->second.action == mark_action::jump_to)
 354                                 {
 355                                         go_to_marker(marker->second.label_argument, 0);
 356                                 }
 357                         }
 358                         else
 359                         {
 360                                 timeline_frame_number_.set(next_frame);
 361                                 frame_fraction_ -= delta;
 362                         }
 363
 364                         going_to_mark_ = false;
 365                 }
 366         }
 367
 368         draw_frame render_progressive_frame()
 369         {
 370                 if (removed_)
 371                         return draw_frame::empty();
 372
 373                 mouse_x_.set(m_x_);
 374                 mouse_y_.set(m_y_);
 375
 376                 if (!paused_)
 377                         advance();
 378
 379                 frame_number_.set(frame_number_.get() + speed_.get());
 380
 381                 for (auto& timeline : timelines_)
 382                         timeline.second.on_frame(timeline_frame_number_.get());
 383
 384                 std::vector<draw_frame> frames;
 385
 386                 for (auto& layer : layers_)
 387                 {
 388                         if (layer.hidden.get())
 389                                 continue;
 390
 391                         draw_frame frame(layer.producer.get()->receive());
 392                         frame.transform() = get_transform(layer);
 393                         frames.push_back(frame);
 394                 }
 395
 396                 return draw_frame(frames);
 397         }
 398
 399         void on_interaction(const interaction_event::ptr& event)
 400         {
 401                 aggregator_.translate_and_send(event);
 402         }
 403
 404         bool collides(double x, double y) const
 405         {
 406                 m_x_ = static_cast<int64_t>(x * pixel_constraints_.width.get());
 407                 m_y_ = static_cast<int64_t>(y * pixel_constraints_.height.get());
 408
 409                 return static_cast<bool>((collission_detect(x, y)));
 410         }
 411
 412         boost::optional<interaction_target> collission_detect(double x, double y) const
 413         {
 414                 for (auto& layer : layers_ | boost::adaptors::reversed)
 415                 {
 416                         if (layer.hidden.get())
 417                                 continue;
 418
 419                         auto transform = get_transform(layer);
 420                         auto translated = translate(x, y, transform);
 421
 422                         if (translated.first >= 0.0
 423                                 && translated.first <= 1.0
 424                                 && translated.second >= 0.0
 425                                 && translated.second <= 1.0
 426                                 && layer.producer.get()->collides(translated.first, translated.second))
 427                         {
 428                                 return std::make_pair(transform, static_cast<interaction_sink*>(layer.producer.get().get()));
 429                         }
 430                 }
 431
 432                 return boost::optional<interaction_target>();
 433         }
 434
 435         std::future<std::wstring> call(const std::vector<std::wstring>& params)
 436         {
 437                 if (!params.empty() && boost::ends_with(params.at(0), L"()"))
 438                         return make_ready_future(handle_call(params));
 439                 else
 440                         return make_ready_future(handle_variable_set(params));
 441         }
 442
 443         std::wstring handle_variable_set(const std::vector<std::wstring>& params)
 444         {
 445                 for (int i = 0; i + 1 < params.size(); i += 2)
 446                 {
 447                         auto found = variables_.find(boost::to_lower_copy(params.at(i)));
 448
 449                         if (found != variables_.end() && found->second->is_public())
 450                                 found->second->from_string(params.at(i + 1));
 451                 }
 452
 453                 return L"";
 454         }
 455
 456         std::wstring handle_call(const std::vector<std::wstring>& params)
 457         {
 458                 auto call = params.at(0);
 459
 460                 if (call == L"play()")
 461                         go_to_marker(params.at(1), -1);
 462                 else if (call == L"remove()")
 463                         remove();
 464                 else if (call == L"next()")
 465                         next();
 466                 else
 467                         CASPAR_THROW_EXCEPTION(user_error() << msg_info(L"Unknown call " + call));
 468
 469                 return L"";
 470         }
 471
 472         void remove()
 473         {
 474                 removed_ = true;
 475                 layers_.clear();
 476         }
 477
 478         void next()
 479         {
 480                 auto marker = find_first_start(timeline_frame_number_.get() + 1);
 481
 482                 if (marker)
 483                 {
 484                         timeline_frame_number_.set(marker->first - 1);
 485                         frame_fraction_ = 0.0;
 486                         paused_ = false;
 487                         going_to_mark_ = true;
 488                 }
 489                 else
 490                 {
 491                         remove();
 492                 }
 493         }
 494
 495         void go_to_marker(const std::wstring& marker_name, int64_t offset)
 496         {
 497                 for (auto& marker : markers_by_frame_)
 498                 {
 499                         if (marker.second.label_argument == marker_name && marker.second.action == mark_action::start)
 500                         {
 501                                 timeline_frame_number_.set(marker.first + offset);
 502                                 frame_fraction_ = 0.0;
 503                                 paused_ = false;
 504                                 going_to_mark_ = true;
 505
 506                                 return;
 507                         }
 508                 }
 509
 510                 if (marker_name == L"intro")
 511                 {
 512                         timeline_frame_number_.set(offset);
 513                         frame_fraction_ = 0.0;
 514                         paused_ = false;
 515                         going_to_mark_ = true;
 516                 }
 517                 else if (marker_name == L"outro")
 518                 {
 519                         remove();
 520                 }
 521                 else
 522                         CASPAR_LOG(info) << print() << L" no marker called " << marker_name << " found";
 523         }
 524
 525         std::wstring print() const
 526         {
 527                 return L"scene[type=" + name() + L"]";
 528         }
 529
 530         std::wstring name() const
 531         {
 532                 return producer_name_;
 533         }
 534
 535         boost::property_tree::wptree info() const
 536         {
 537                 boost::property_tree::wptree info;
 538                 info.add(L"type", L"scene");
 539                 info.add(L"producer-name", name());
 540                 info.add(L"frame-number", frame_number_.get());
 541                 info.add(L"timeline-frame-number", timeline_frame_number_.get());
 542
 543                 for (auto& var : variables_)
 544                 {
 545                         boost::property_tree::wptree variable_info;
 546
 547                         variable_info.add(L"name", var.first);
 548                         variable_info.add(L"public", var.second->is_public());
 549                         variable_info.add(L"value", var.second->to_string());
 550
 551                         info.add_child(L"variables.variable", variable_info);
 552                 }
 553
 554                 for (auto& layer : layers_)
 555                 {
 556                         boost::property_tree::wptree layer_info;
 557
 558                         layer_info.add(L"name", layer.name.get());
 559                         layer_info.add_child(L"producer", layer.producer.get()->info());
 560                         layer_info.add(L"x", layer.position.x.get());
 561                         layer_info.add(L"y", layer.position.y.get());
 562                         layer_info.add(L"width", layer.producer.get()->pixel_constraints().width.get());
 563                         layer_info.add(L"height", layer.producer.get()->pixel_constraints().height.get());
 564
 565                         info.add_child(L"layers.layer", layer_info);
 566                 }
 567
 568                 return info;
 569         }
 570
 571         monitor::subject& monitor_output()
 572         {
 573                 return monitor_subject_;
 574         }
 575 };
 576
 577 scene_producer::scene_producer(std::wstring producer_name, int width, int height, const video_format_desc& format_desc)
 578         : impl_(new impl(std::move(producer_name), width, height, format_desc))
 579 {
 580 }
 581
 582 scene_producer::~scene_producer()
 583 {
 584 }
 585
 586 layer& scene_producer::create_layer(
 587                 const spl::shared_ptr<frame_producer>& producer, int x, int y, const std::wstring& name)
 588 {
 589         return impl_->create_layer(producer, x, y, name);
 590 }
 591
 592 layer& scene_producer::create_layer(
 593                 const spl::shared_ptr<frame_producer>& producer, const std::wstring& name)
 594 {
 595         return impl_->create_layer(producer, 0, 0, name);
 596 }
 597
 598 void scene_producer::reverse_layers() {
 599         impl_->reverse_layers();
 600 }
 601
 602 binding<int64_t> scene_producer::timeline_frame()
 603 {
 604         return impl_->timeline_frame();
 605 }
 606
 607 draw_frame scene_producer::receive_impl()
 608 {
 609         return impl_->render_frame();
 610 }
 611
 612 constraints& scene_producer::pixel_constraints() { return impl_->pixel_constraints_; }
 613
 614 void scene_producer::on_interaction(const interaction_event::ptr& event)
 615 {
 616         impl_->on_interaction(event);
 617 }
 618
 619 bool scene_producer::collides(double x, double y) const
 620 {
 621         return impl_->collides(x, y);
 622 }
 623
 624 std::wstring scene_producer::print() const
 625 {
 626         return impl_->print();
 627 }
 628
 629 std::wstring scene_producer::name() const
 630 {
 631         return impl_->name();
 632 }
 633
 634 boost::property_tree::wptree scene_producer::info() const
 635 {
 636         return impl_->info();
 637 }
 638
 639 std::future<std::wstring> scene_producer::call(const std::vector<std::wstring>& params)
 640 {
 641         return impl_->call(params);
 642 }
 643
 644 monitor::subject& scene_producer::monitor_output()
 645 {
 646         return impl_->monitor_output();
 647 }
 648
 649 void scene_producer::store_keyframe(void* timeline_identity, const keyframe& k)
 650 {
 651         impl_->store_keyframe(timeline_identity, k);
 652 }
 653
 654 void scene_producer::store_variable(
 655                 const std::wstring& name, const std::shared_ptr<core::variable>& var)
 656 {
 657         impl_->store_variable(name, var);
 658 }
 659
 660 void scene_producer::add_mark(int64_t frame, mark_action action, const std::wstring& label)
 661 {
 662         impl_->add_mark(frame, action, label);
 663 }
 664
 665 core::variable& scene_producer::get_variable(const std::wstring& name)
 666 {
 667         return impl_->get_variable(name);
 668 }
 669
 670 const std::vector<std::wstring>& scene_producer::get_variables() const
 671 {
 672         return impl_->get_variables();
 673 }
 674
 675 }}}