git.sesse.net Git - casparcg/blob - modules/screen/consumer/screen_consumer.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: Robert Nagy, ronag89@gmail.com
  20 */
  21
  22 #include "screen_consumer.h"
  23
  24 #include <GL/glew.h>
  25 #include <SFML/Window.hpp>
  26
  27 #include <common/diagnostics/graph.h>
  28 #include <common/gl/gl_check.h>
  29 #include <common/log.h>
  30 #include <common/memory.h>
  31 #include <common/array.h>
  32 #include <common/memshfl.h>
  33 #include <common/utf.h>
  34 #include <common/prec_timer.h>
  35
  36 #include <ffmpeg/producer/filter/filter.h>
  37
  38 #include <core/video_format.h>
  39 #include <core/frame/frame.h>
  40 #include <core/consumer/frame_consumer.h>
  41
  42 #include <boost/timer.hpp>
  43 #include <boost/circular_buffer.hpp>
  44 #include <boost/lexical_cast.hpp>
  45 #include <boost/foreach.hpp>
  46 #include <boost/property_tree/ptree.hpp>
  47 #include <boost/thread.hpp>
  48
  49 #include <tbb/atomic.h>
  50 #include <tbb/concurrent_queue.h>
  51 #include <tbb/parallel_for.h>
  52
  53 #include <boost/assign.hpp>
  54
  55 #include <asmlib.h>
  56
  57 #include <algorithm>
  58 #include <vector>
  59
  60 #if defined(_MSC_VER)
  61 #pragma warning (push)
  62 #pragma warning (disable : 4244)
  63 #endif
  64 extern "C"
  65 {
  66         #define __STDC_CONSTANT_MACROS
  67         #define __STDC_LIMIT_MACROS
  68         #include <libavcodec/avcodec.h>
  69         #include <libavutil/imgutils.h>
  70 }
  71 #if defined(_MSC_VER)
  72 #pragma warning (pop)
  73 #endif
  74
  75 namespace caspar { namespace screen {
  76
  77 enum stretch
  78 {
  79         none,
  80         uniform,
  81         fill,
  82         uniform_to_fill
  83 };
  84
  85 struct configuration
  86 {
  87         enum aspect_ratio
  88         {
  89                 aspect_4_3 = 0,
  90                 aspect_16_9,
  91                 aspect_invalid,
  92         };
  93
  94         std::wstring    name;
  95         int                             screen_index;
  96         stretch                 stretch;
  97         bool                    windowed;
  98         bool                    auto_deinterlace;
  99         bool                    key_only;
 100         aspect_ratio    aspect;
 101         bool                    vsync;
 102
 103         configuration()
 104                 : name(L"ogl")
 105                 , screen_index(0)
 106                 , stretch(fill)
 107                 , windowed(true)
 108                 , auto_deinterlace(true)
 109                 , key_only(false)
 110                 , aspect(aspect_invalid)
 111                 , vsync(true)
 112         {
 113         }
 114 };
 115
 116 struct screen_consumer : boost::noncopyable
 117 {
 118         const configuration                                     config_;
 119         core::video_format_desc                         format_desc_;
 120         int                                                                     channel_index_;
 121
 122         GLuint                                                          texture_;
 123         std::vector<GLuint>                                     pbos_;
 124
 125         float                                                           width_;
 126         float                                                           height_;
 127         int                                                                     screen_x_;
 128         int                                                                     screen_y_;
 129         int                                                                     screen_width_;
 130         int                                                                     screen_height_;
 131         int                                                                     square_width_;
 132         int                                                                     square_height_;
 133
 134         sf::Window                                                      window_;
 135
 136         spl::shared_ptr<diagnostics::graph>     graph_;
 137         boost::timer                                            perf_timer_;
 138         boost::timer                                            tick_timer_;
 139
 140         caspar::prec_timer                                      wait_timer_;
 141
 142         tbb::concurrent_bounded_queue<core::const_frame>        frame_buffer_;
 143
 144         boost::thread                                           thread_;
 145         tbb::atomic<bool>                                       is_running_;
 146
 147         ffmpeg::filter                                          filter_;
 148 public:
 149         screen_consumer(const configuration& config, const core::video_format_desc& format_desc, int channel_index)
 150                 : config_(config)
 151                 , format_desc_(format_desc)
 152                 , channel_index_(channel_index)
 153                 , texture_(0)
 154                 , pbos_(2, 0)
 155                 , screen_width_(format_desc.width)
 156                 , screen_height_(format_desc.height)
 157                 , square_width_(format_desc.square_width)
 158                 , square_height_(format_desc.square_height)
 159                 , filter_(format_desc.field_mode == core::field_mode::progressive || !config.auto_deinterlace ? L"" : L"YADIF=1:-1", boost::assign::list_of(PIX_FMT_BGRA))
 160         {
 161                 if(format_desc_.format == core::video_format::ntsc && config_.aspect == configuration::aspect_4_3)
 162                 {
 163                         // Use default values which are 4:3.
 164                 }
 165                 else
 166                 {
 167                         if(config_.aspect == configuration::aspect_16_9)
 168                                 square_width_ = (format_desc.height*16)/9;
 169                         else if(config_.aspect == configuration::aspect_4_3)
 170                                 square_width_ = (format_desc.height*4)/3;
 171                 }
 172
 173                 frame_buffer_.set_capacity(2);
 174
 175                 graph_->set_color("tick-time", diagnostics::color(0.0f, 0.6f, 0.9f));
 176                 graph_->set_color("frame-time", diagnostics::color(0.1f, 1.0f, 0.1f));
 177                 graph_->set_color("dropped-frame", diagnostics::color(0.3f, 0.6f, 0.3f));
 178                 graph_->set_text(print());
 179                 diagnostics::register_graph(graph_);
 180
 181                 DISPLAY_DEVICE d_device = {sizeof(d_device), 0};
 182                 std::vector<DISPLAY_DEVICE> displayDevices;
 183                 for(int n = 0; EnumDisplayDevices(NULL, n, &d_device, NULL); ++n)
 184                         displayDevices.push_back(d_device);
 185
 186                 if(config_.screen_index >= displayDevices.size())
 187                         CASPAR_LOG(warning) << print() << L" Invalid screen-index: " << config_.screen_index;
 188
 189                 DEVMODE devmode = {};
 190                 if(!EnumDisplaySettings(displayDevices[config_.screen_index].DeviceName, ENUM_CURRENT_SETTINGS, &devmode))
 191                         CASPAR_LOG(warning) << print() << L" Could not find display settings for screen-index: " << config_.screen_index;
 192
 193                 screen_x_               = devmode.dmPosition.x;
 194                 screen_y_               = devmode.dmPosition.y;
 195                 screen_width_   = config_.windowed ? square_width_ : devmode.dmPelsWidth;
 196                 screen_height_  = config_.windowed ? square_height_ : devmode.dmPelsHeight;
 197
 198                 is_running_ = true;
 199                 thread_ = boost::thread([this]{run();});
 200         }
 201
 202         ~screen_consumer()
 203         {
 204                 is_running_ = false;
 205                 frame_buffer_.try_push(core::const_frame::empty());
 206                 thread_.join();
 207         }
 208
 209         void init()
 210         {
 211                 window_.Create(sf::VideoMode(screen_width_, screen_height_, 32), u8(print()), config_.windowed ? sf::Style::Resize | sf::Style::Close : sf::Style::Fullscreen);
 212                 window_.ShowMouseCursor(false);
 213                 window_.SetPosition(screen_x_, screen_y_);
 214                 window_.SetSize(screen_width_, screen_height_);
 215                 window_.SetActive();
 216
 217                 if(!GLEW_VERSION_2_1 && glewInit() != GLEW_OK)
 218                         CASPAR_THROW_EXCEPTION(gl::ogl_exception() << msg_info("Failed to initialize GLEW."));
 219
 220                 if(!GLEW_VERSION_2_1)
 221                         CASPAR_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 2.1 support."));
 222
 223                 GL(glEnable(GL_TEXTURE_2D));
 224                 GL(glDisable(GL_DEPTH_TEST));
 225                 GL(glClearColor(0.0, 0.0, 0.0, 0.0));
 226                 GL(glViewport(0, 0, format_desc_.width, format_desc_.height));
 227                 GL(glLoadIdentity());
 228
 229                 calculate_aspect();
 230
 231                 GL(glGenTextures(1, &texture_));
 232                 GL(glBindTexture(GL_TEXTURE_2D, texture_));
 233                 GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
 234                 GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
 235                 GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP));
 236                 GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP));
 237                 GL(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, format_desc_.width, format_desc_.height, 0, GL_BGRA, GL_UNSIGNED_BYTE, 0));
 238                 GL(glBindTexture(GL_TEXTURE_2D, 0));
 239
 240                 GL(glGenBuffers(2, pbos_.data()));
 241
 242                 glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, pbos_[0]);
 243                 glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_ARB, format_desc_.size, 0, GL_STREAM_DRAW_ARB);
 244                 glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, pbos_[1]);
 245                 glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_ARB, format_desc_.size, 0, GL_STREAM_DRAW_ARB);
 246                 glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 247
 248                 auto wglSwapIntervalEXT = reinterpret_cast<void(APIENTRY*)(int)>(wglGetProcAddress("wglSwapIntervalEXT"));
 249                 if(wglSwapIntervalEXT)
 250                 {
 251                         if(config_.vsync)
 252                         {
 253                                 wglSwapIntervalEXT(1);
 254                                 CASPAR_LOG(info) << print() << " Enabled vsync.";
 255                         }
 256                         else
 257                                 wglSwapIntervalEXT(0);
 258                 }
 259
 260                 CASPAR_LOG(info) << print() << " Successfully Initialized.";
 261         }
 262
 263         void uninit()
 264         {
 265                 if(texture_)
 266                         glDeleteTextures(1, &texture_);
 267
 268                 BOOST_FOREACH(auto& pbo, pbos_)
 269                 {
 270                         if(pbo)
 271                                 glDeleteBuffers(1, &pbo);
 272                 }
 273         }
 274
 275         void run()
 276         {
 277                 try
 278                 {
 279                         init();
 280
 281                         while(is_running_)
 282                         {
 283                                 try
 284                                 {
 285                                         sf::Event e;
 286                                         while(window_.GetEvent(e))
 287                                         {
 288                                                 if(e.Type == sf::Event::Resized)
 289                                                         calculate_aspect();
 290                                                 else if(e.Type == sf::Event::Closed)
 291                                                         is_running_ = false;
 292                                         }
 293
 294                                         auto frame = core::const_frame::empty();
 295                                         frame_buffer_.pop(frame);
 296
 297                                         render_and_draw_frame(frame);
 298
 299                                         /*perf_timer_.restart();
 300                                         render(frame);
 301                                         graph_->set_value("frame-time", perf_timer_.elapsed()*format_desc_.fps*0.5);
 302
 303                                         window_.Display();*/
 304
 305                                         graph_->set_value("tick-time", tick_timer_.elapsed()*format_desc_.fps*0.5);
 306                                         tick_timer_.restart();
 307                                 }
 308                                 catch(...)
 309                                 {
 310                                         CASPAR_LOG_CURRENT_EXCEPTION();
 311                                         is_running_ = false;
 312                                 }
 313                         }
 314
 315                         uninit();
 316                 }
 317                 catch(...)
 318                 {
 319                         CASPAR_LOG_CURRENT_EXCEPTION();
 320                 }
 321         }
 322
 323         void try_sleep_almost_until_vblank()
 324         {
 325                 static const double THRESHOLD = 0.003;
 326                 double threshold = config_.vsync ? THRESHOLD : 0.0;
 327
 328                 auto frame_time = 1.0 / (format_desc_.fps * format_desc_.field_count);
 329
 330                 wait_timer_.tick(frame_time - threshold);
 331         }
 332
 333         void wait_for_vblank_and_display()
 334         {
 335                 try_sleep_almost_until_vblank();
 336                 window_.Display();
 337                 // Make sure that the next tick measures the duration from this point in time.
 338                 wait_timer_.tick(0.0);
 339         }
 340
 341         spl::shared_ptr<AVFrame> get_av_frame()
 342         {
 343                 spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);
 344                 avcodec_get_frame_defaults(av_frame.get());
 345
 346                 av_frame->linesize[0]           = format_desc_.width*4;
 347                 av_frame->format                        = PIX_FMT_BGRA;
 348                 av_frame->width                         = format_desc_.width;
 349                 av_frame->height                        = format_desc_.height;
 350                 av_frame->interlaced_frame      = format_desc_.field_mode != core::field_mode::progressive;
 351                 av_frame->top_field_first       = format_desc_.field_mode == core::field_mode::upper ? 1 : 0;
 352
 353                 return av_frame;
 354         }
 355
 356         void render_and_draw_frame(core::const_frame frame)
 357         {
 358                 if(static_cast<size_t>(frame.image_data().size()) != format_desc_.size)
 359                         return;
 360
 361                 if(screen_width_ == 0 && screen_height_ == 0)
 362                         return;
 363
 364                 perf_timer_.restart();
 365                 auto av_frame = get_av_frame();
 366                 av_frame->data[0] = const_cast<uint8_t*>(frame.image_data().begin());
 367
 368                 filter_.push(av_frame);
 369                 auto frames = filter_.poll_all();
 370
 371                 if (frames.empty())
 372                         return;
 373
 374                 if (frames.size() == 1)
 375                 {
 376                         render(frames[0]);
 377                         graph_->set_value("frame-time", perf_timer_.elapsed() * format_desc_.fps * 0.5);
 378
 379                         wait_for_vblank_and_display(); // progressive frame
 380                 }
 381                 else if (frames.size() == 2)
 382                 {
 383                         render(frames[0]);
 384                         double perf_elapsed = perf_timer_.elapsed();
 385
 386                         wait_for_vblank_and_display(); // field1
 387
 388                         perf_timer_.restart();
 389                         render(frames[1]);
 390                         perf_elapsed += perf_timer_.elapsed();
 391                         graph_->set_value("frame-time", perf_elapsed * format_desc_.fps * 0.5);
 392
 393                         wait_for_vblank_and_display(); // field2
 394                 }
 395         }
 396
 397         void render(spl::shared_ptr<AVFrame> av_frame)
 398         {
 399                 GL(glBindTexture(GL_TEXTURE_2D, texture_));
 400
 401                 GL(glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbos_[0]));
 402                 GL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, format_desc_.width, format_desc_.height, GL_BGRA, GL_UNSIGNED_BYTE, 0));
 403
 404                 GL(glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbos_[1]));
 405                 GL(glBufferData(GL_PIXEL_UNPACK_BUFFER, format_desc_.size, 0, GL_STREAM_DRAW));
 406
 407                 auto ptr = reinterpret_cast<char*>(GL2(glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY)));
 408                 if(ptr)
 409                 {
 410                         if(config_.key_only)
 411                         {
 412                                 tbb::parallel_for(tbb::blocked_range<int>(0, format_desc_.height), [&](const tbb::blocked_range<int>& r)
 413                                 {
 414                                         for(int n = r.begin(); n != r.end(); ++n)
 415                                                 aligned_memshfl(ptr+n*format_desc_.width*4, av_frame->data[0]+n*av_frame->linesize[0], format_desc_.width*4, 0x0F0F0F0F, 0x0B0B0B0B, 0x07070707, 0x03030303);
 416                                 });
 417                         }
 418                         else
 419                         {
 420                                 tbb::parallel_for(tbb::blocked_range<int>(0, format_desc_.height), [&](const tbb::blocked_range<int>& r)
 421                                 {
 422                                         for(int n = r.begin(); n != r.end(); ++n)
 423                                                 A_memcpy(ptr+n*format_desc_.width*4, av_frame->data[0]+n*av_frame->linesize[0], format_desc_.width*4);
 424                                 });
 425                         }
 426
 427                         GL(glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER)); // release the mapped buffer
 428                 }
 429
 430                 GL(glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0));
 431
 432                 GL(glClear(GL_COLOR_BUFFER_BIT));
 433                 glBegin(GL_QUADS);
 434                                 glTexCoord2f(0.0f,        1.0f);        glVertex2f(-width_, -height_);
 435                                 glTexCoord2f(1.0f,        1.0f);        glVertex2f( width_, -height_);
 436                                 glTexCoord2f(1.0f,        0.0f);        glVertex2f( width_,  height_);
 437                                 glTexCoord2f(0.0f,        0.0f);        glVertex2f(-width_,  height_);
 438                 glEnd();
 439
 440                 GL(glBindTexture(GL_TEXTURE_2D, 0));
 441
 442                 std::rotate(pbos_.begin(), pbos_.begin() + 1, pbos_.end());
 443         }
 444
 445
 446         bool send(core::const_frame frame)
 447         {
 448                 if(!frame_buffer_.try_push(frame))
 449                         graph_->set_tag("dropped-frame");
 450                 return is_running_;
 451         }
 452
 453         std::wstring print() const
 454         {
 455                 return config_.name + L"[" + boost::lexical_cast<std::wstring>(channel_index_) + L"|" + format_desc_.name + L"]";
 456         }
 457
 458         void calculate_aspect()
 459         {
 460                 if(config_.windowed)
 461                 {
 462                         screen_height_ = window_.GetHeight();
 463                         screen_width_ = window_.GetWidth();
 464                 }
 465
 466                 GL(glViewport(0, 0, screen_width_, screen_height_));
 467
 468                 std::pair<float, float> target_ratio = None();
 469                 if(config_.stretch == fill)
 470                         target_ratio = Fill();
 471                 else if(config_.stretch == uniform)
 472                         target_ratio = Uniform();
 473                 else if(config_.stretch == uniform_to_fill)
 474                         target_ratio = UniformToFill();
 475
 476                 width_ = target_ratio.first;
 477                 height_ = target_ratio.second;
 478         }
 479
 480         std::pair<float, float> None()
 481         {
 482                 float width = static_cast<float>(square_width_)/static_cast<float>(screen_width_);
 483                 float height = static_cast<float>(square_height_)/static_cast<float>(screen_height_);
 484
 485                 return std::make_pair(width, height);
 486         }
 487
 488         std::pair<float, float> Uniform()
 489         {
 490                 float aspect = static_cast<float>(square_width_)/static_cast<float>(square_height_);
 491                 float width = std::min(1.0f, static_cast<float>(screen_height_)*aspect/static_cast<float>(screen_width_));
 492                 float height = static_cast<float>(screen_width_*width)/static_cast<float>(screen_height_*aspect);
 493
 494                 return std::make_pair(width, height);
 495         }
 496
 497         std::pair<float, float> Fill()
 498         {
 499                 return std::make_pair(1.0f, 1.0f);
 500         }
 501
 502         std::pair<float, float> UniformToFill()
 503         {
 504                 float wr = static_cast<float>(square_width_)/static_cast<float>(screen_width_);
 505                 float hr = static_cast<float>(square_height_)/static_cast<float>(screen_height_);
 506                 float r_inv = 1.0f/std::min(wr, hr);
 507
 508                 float width = wr*r_inv;
 509                 float height = hr*r_inv;
 510
 511                 return std::make_pair(width, height);
 512         }
 513 };
 514
 515
 516 struct screen_consumer_proxy : public core::frame_consumer
 517 {
 518         const configuration config_;
 519         std::unique_ptr<screen_consumer> consumer_;
 520
 521 public:
 522
 523         screen_consumer_proxy(const configuration& config)
 524                 : config_(config){}
 525
 526         // frame_consumer
 527
 528         void initialize(const core::video_format_desc& format_desc, int channel_index) override
 529         {
 530                 consumer_.reset();
 531                 consumer_.reset(new screen_consumer(config_, format_desc, channel_index));
 532         }
 533
 534         bool send(core::const_frame frame) override
 535         {
 536                 return consumer_->send(frame);
 537         }
 538
 539         std::wstring print() const override
 540         {
 541                 return consumer_ ? consumer_->print() : L"[screen_consumer]";
 542         }
 543
 544         std::wstring name() const override
 545         {
 546                 return L"screen";
 547         }
 548
 549         boost::property_tree::wptree info() const override
 550         {
 551                 boost::property_tree::wptree info;
 552                 info.add(L"type", L"screen");
 553                 info.add(L"key-only", config_.key_only);
 554                 info.add(L"windowed", config_.windowed);
 555                 info.add(L"auto-deinterlace", config_.auto_deinterlace);
 556                 return info;
 557         }
 558
 559         bool has_synchronization_clock() const override
 560         {
 561                 return false;
 562         }
 563
 564         int buffer_depth() const override
 565         {
 566                 return 2;
 567         }
 568
 569         int index() const override
 570         {
 571                 return 600 + (config_.key_only ? 10 : 0) + config_.screen_index;
 572         }
 573
 574         void subscribe(const monitor::observable::observer_ptr& o) override
 575         {
 576         }
 577
 578         void unsubscribe(const monitor::observable::observer_ptr& o) override
 579         {
 580         }
 581 };
 582
 583 spl::shared_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params)
 584 {
 585         if(params.size() < 1 || params[0] != L"SCREEN")
 586                 return core::frame_consumer::empty();
 587
 588         configuration config;
 589
 590         if(params.size() > 1)
 591                 config.screen_index = boost::lexical_cast<int>(params[1]);
 592
 593         config.key_only = std::find(params.begin(), params.end(), L"WINDOWED") != params.end();
 594         config.key_only = std::find(params.begin(), params.end(), L"KEY_ONLY") != params.end();
 595
 596         auto name_it    = std::find(params.begin(), params.end(), L"NAME");
 597         if(name_it != params.end() && ++name_it != params.end())
 598                 config.name = *name_it;
 599
 600         return spl::make_shared<screen_consumer_proxy>(config);
 601 }
 602
 603 spl::shared_ptr<core::frame_consumer> create_consumer(const boost::property_tree::wptree& ptree)
 604 {
 605         configuration config;
 606         config.name                             = ptree.get(L"name",     config.name);
 607         config.screen_index             = ptree.get(L"device",   config.screen_index+1)-1;
 608         config.windowed                 = ptree.get(L"windowed", config.windowed);
 609         config.key_only                 = ptree.get(L"key-only", config.key_only);
 610         config.auto_deinterlace = ptree.get(L"auto-deinterlace", config.auto_deinterlace);
 611         config.vsync                    = ptree.get(L"vsync", config.vsync);
 612
 613         auto stretch_str = ptree.get(L"stretch", L"default");
 614         if(stretch_str == L"uniform")
 615                 config.stretch = stretch::uniform;
 616         else if(stretch_str == L"uniform_to_fill")
 617                 config.stretch = stretch::uniform_to_fill;
 618
 619         auto aspect_str = ptree.get(L"aspect-ratio", L"default");
 620         if(aspect_str == L"16:9")
 621                 config.aspect = configuration::aspect_16_9;
 622         else if(aspect_str == L"4:3")
 623                 config.aspect = configuration::aspect_4_3;
 624
 625         return spl::make_shared<screen_consumer_proxy>(config);
 626 }
 627
 628 }}