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 #include <common/future.h>
  36 #include <common/timer.h>
  37 #include <common/param.h>
  38
  39 //#include <windows.h>
  40
  41 #include <ffmpeg/producer/filter/filter.h>
  42
  43 #include <core/video_format.h>
  44 #include <core/frame/frame.h>
  45 #include <core/consumer/frame_consumer.h>
  46 #include <core/interaction/interaction_sink.h>
  47
  48 #include <boost/circular_buffer.hpp>
  49 #include <boost/lexical_cast.hpp>
  50 #include <boost/property_tree/ptree.hpp>
  51 #include <boost/thread.hpp>
  52 #include <boost/algorithm/string.hpp>
  53
  54 #include <tbb/atomic.h>
  55 #include <tbb/concurrent_queue.h>
  56 #include <tbb/parallel_for.h>
  57
  58 #include <asmlib.h>
  59
  60 #include <algorithm>
  61 #include <vector>
  62
  63 #if defined(_MSC_VER)
  64 #pragma warning (push)
  65 #pragma warning (disable : 4244)
  66 #endif
  67 extern "C"
  68 {
  69         #define __STDC_CONSTANT_MACROS
  70         #define __STDC_LIMIT_MACROS
  71         #include <libavcodec/avcodec.h>
  72         #include <libavutil/imgutils.h>
  73 }
  74 #if defined(_MSC_VER)
  75 #pragma warning (pop)
  76 #endif
  77
  78 namespace caspar { namespace screen {
  79
  80 enum class stretch
  81 {
  82         none,
  83         uniform,
  84         fill,
  85         uniform_to_fill
  86 };
  87
  88 struct configuration
  89 {
  90         enum class aspect_ratio
  91         {
  92                 aspect_4_3 = 0,
  93                 aspect_16_9,
  94                 aspect_invalid,
  95         };
  96
  97         std::wstring    name                            = L"ogl";
  98         int                             screen_index            = 0;
  99         screen::stretch stretch                         = screen::stretch::fill;
 100         bool                    windowed                        = true;
 101         bool                    auto_deinterlace        = true;
 102         bool                    key_only                        = false;
 103         aspect_ratio    aspect                          = aspect_ratio::aspect_invalid;
 104         bool                    vsync                           = true;
 105         bool                    interactive                     = true;
 106 };
 107
 108 struct screen_consumer : boost::noncopyable
 109 {
 110         const configuration                                                                     config_;
 111         core::video_format_desc                                                         format_desc_;
 112         int                                                                                                     channel_index_;
 113
 114         GLuint                                                                                          texture_                = 0;
 115         std::vector<GLuint>                                                                     pbos_                   = std::vector<GLuint> { 0, 0 };
 116
 117         float                                                                                           width_;
 118         float                                                                                           height_;
 119         int                                                                                                     screen_x_;
 120         int                                                                                                     screen_y_;
 121         int                                                                                                     screen_width_   = format_desc_.width;
 122         int                                                                                                     screen_height_  = format_desc_.height;
 123         int                                                                                                     square_width_   = format_desc_.square_width;
 124         int                                                                                                     square_height_  = format_desc_.square_height;
 125
 126         sf::Window                                                                                      window_;
 127
 128         spl::shared_ptr<diagnostics::graph>                                     graph_;
 129         caspar::timer                                                                           perf_timer_;
 130         caspar::timer                                                                           tick_timer_;
 131
 132         caspar::prec_timer                                                                      wait_timer_;
 133
 134         tbb::concurrent_bounded_queue<core::const_frame>        frame_buffer_;
 135         core::interaction_sink*                                                         sink_;
 136
 137         boost::thread                                                                           thread_;
 138         tbb::atomic<bool>                                                                       is_running_;
 139
 140         ffmpeg::filter                                                                          filter_;
 141 public:
 142         screen_consumer(
 143                         const configuration& config,
 144                         const core::video_format_desc& format_desc,
 145                         int channel_index,
 146                         core::interaction_sink* sink)
 147                 : config_(config)
 148                 , format_desc_(format_desc)
 149                 , channel_index_(channel_index)
 150                 , sink_(sink)
 151                 , filter_([&]() -> ffmpeg::filter
 152                 {
 153                         const auto sample_aspect_ratio =
 154                                 boost::rational<int>(
 155                                         format_desc.square_width,
 156                                         format_desc.square_height) /
 157                                 boost::rational<int>(
 158                                         format_desc.width,
 159                                         format_desc.height);
 160
 161                         return ffmpeg::filter(
 162                                 format_desc.width,
 163                                 format_desc.height,
 164                                 boost::rational<int>(format_desc.duration, format_desc.time_scale),
 165                                 boost::rational<int>(format_desc.time_scale, format_desc.duration),
 166                                 sample_aspect_ratio,
 167                                 AV_PIX_FMT_BGRA,
 168                                 { AV_PIX_FMT_BGRA },
 169                                 format_desc.field_mode == core::field_mode::progressive || !config.auto_deinterlace ? "" : "YADIF=1:-1");
 170                 }())
 171         {
 172                 if (format_desc_.format == core::video_format::ntsc && config_.aspect == configuration::aspect_ratio::aspect_4_3)
 173                 {
 174                         // Use default values which are 4:3.
 175                 }
 176                 else
 177                 {
 178                         if (config_.aspect == configuration::aspect_ratio::aspect_16_9)
 179                                 square_width_ = (format_desc.height*16)/9;
 180                         else if (config_.aspect == configuration::aspect_ratio::aspect_4_3)
 181                                 square_width_ = (format_desc.height*4)/3;
 182                 }
 183
 184                 frame_buffer_.set_capacity(1);
 185
 186                 graph_->set_color("tick-time", diagnostics::color(0.0f, 0.6f, 0.9f));
 187                 graph_->set_color("frame-time", diagnostics::color(0.1f, 1.0f, 0.1f));
 188                 graph_->set_color("dropped-frame", diagnostics::color(0.3f, 0.6f, 0.3f));
 189                 graph_->set_text(print());
 190                 diagnostics::register_graph(graph_);
 191
 192                 /*DISPLAY_DEVICE d_device = {sizeof(d_device), 0};
 193                 std::vector<DISPLAY_DEVICE> displayDevices;
 194                 for(int n = 0; EnumDisplayDevices(NULL, n, &d_device, NULL); ++n)
 195                         displayDevices.push_back(d_device);
 196
 197                 if(config_.screen_index >= displayDevices.size())
 198                         CASPAR_LOG(warning) << print() << L" Invalid screen-index: " << config_.screen_index;
 199
 200                 DEVMODE devmode = {};
 201                 if(!EnumDisplaySettings(displayDevices[config_.screen_index].DeviceName, ENUM_CURRENT_SETTINGS, &devmode))
 202                         CASPAR_LOG(warning) << print() << L" Could not find display settings for screen-index: " << config_.screen_index;
 203
 204                 screen_x_               = devmode.dmPosition.x;
 205                 screen_y_               = devmode.dmPosition.y;
 206                 screen_width_   = config_.windowed ? square_width_ : devmode.dmPelsWidth;
 207                 screen_height_  = config_.windowed ? square_height_ : devmode.dmPelsHeight;*/
 208                 screen_x_               = 0;
 209                 screen_y_               = 0;
 210                 screen_width_   = square_width_;
 211                 screen_height_  = square_height_;
 212
 213                 is_running_ = true;
 214                 thread_ = boost::thread([this]{run();});
 215         }
 216
 217         ~screen_consumer()
 218         {
 219                 is_running_ = false;
 220                 frame_buffer_.try_push(core::const_frame::empty());
 221                 thread_.join();
 222         }
 223
 224         void init()
 225         {
 226                 window_.create(sf::VideoMode(screen_width_, screen_height_, 32), u8(L"Screen consumer " + channel_and_format()), config_.windowed ? sf::Style::Resize | sf::Style::Close : sf::Style::Fullscreen);
 227                 window_.setMouseCursorVisible(config_.interactive);
 228                 window_.setPosition(sf::Vector2i(screen_x_, screen_y_));
 229                 window_.setSize(sf::Vector2u(screen_width_, screen_height_));
 230                 window_.setActive();
 231
 232                 if(!GLEW_VERSION_2_1 && glewInit() != GLEW_OK)
 233                         CASPAR_THROW_EXCEPTION(gl::ogl_exception() << msg_info("Failed to initialize GLEW."));
 234
 235                 if(!GLEW_VERSION_2_1)
 236                         CASPAR_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 2.1 support."));
 237
 238                 GL(glEnable(GL_TEXTURE_2D));
 239                 GL(glDisable(GL_DEPTH_TEST));
 240                 GL(glClearColor(0.0, 0.0, 0.0, 0.0));
 241                 GL(glViewport(0, 0, format_desc_.width, format_desc_.height));
 242                 GL(glLoadIdentity());
 243
 244                 calculate_aspect();
 245
 246                 GL(glGenTextures(1, &texture_));
 247                 GL(glBindTexture(GL_TEXTURE_2D, texture_));
 248                 GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
 249                 GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
 250                 GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP));
 251                 GL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP));
 252                 GL(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, format_desc_.width, format_desc_.height, 0, GL_BGRA, GL_UNSIGNED_BYTE, 0));
 253                 GL(glBindTexture(GL_TEXTURE_2D, 0));
 254
 255                 GL(glGenBuffers(2, pbos_.data()));
 256
 257                 glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, pbos_[0]);
 258                 glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_ARB, format_desc_.size, 0, GL_STREAM_DRAW_ARB);
 259                 glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, pbos_[1]);
 260                 glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_ARB, format_desc_.size, 0, GL_STREAM_DRAW_ARB);
 261                 glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 262
 263                 window_.setVerticalSyncEnabled(config_.vsync);
 264
 265                 if (config_.vsync)
 266                 {
 267                         CASPAR_LOG(info) << print() << " Enabled vsync.";
 268                 }
 269                 /*auto wglSwapIntervalEXT = reinterpret_cast<void(APIENTRY*)(int)>(wglGetProcAddress("wglSwapIntervalEXT"));
 270                 if(wglSwapIntervalEXT)
 271                 {
 272                         if(config_.vsync)
 273                         {
 274                                 wglSwapIntervalEXT(1);
 275                                 CASPAR_LOG(info) << print() << " Enabled vsync.";
 276                         }
 277                         else
 278                                 wglSwapIntervalEXT(0);
 279                 }*/
 280
 281                 CASPAR_LOG(info) << print() << " Successfully Initialized.";
 282         }
 283
 284         void uninit()
 285         {
 286                 if(texture_)
 287                         glDeleteTextures(1, &texture_);
 288
 289                 for (auto& pbo : pbos_)
 290                 {
 291                         if(pbo)
 292                                 glDeleteBuffers(1, &pbo);
 293                 }
 294         }
 295
 296         void run()
 297         {
 298                 try
 299                 {
 300                         init();
 301
 302                         while(is_running_)
 303                         {
 304                                 try
 305                                 {
 306                                         sf::Event e;
 307                                         while(window_.pollEvent(e))
 308                                         {
 309                                                 if (e.type == sf::Event::Resized)
 310                                                         calculate_aspect();
 311                                                 else if (e.type == sf::Event::Closed)
 312                                                         is_running_ = false;
 313                                                 else if (config_.interactive && sink_)
 314                                                 {
 315                                                         switch (e.type)
 316                                                         {
 317                                                         case sf::Event::MouseMoved:
 318                                                                 {
 319                                                                         auto& mouse_move = e.mouseMove;
 320                                                                         sink_->on_interaction(spl::make_shared<core::mouse_move_event>(
 321                                                                                         1,
 322                                                                                         static_cast<double>(mouse_move.x) / screen_width_,
 323                                                                                         static_cast<double>(mouse_move.y) / screen_height_));
 324                                                                 }
 325                                                                 break;
 326                                                         case sf::Event::MouseButtonPressed:
 327                                                         case sf::Event::MouseButtonReleased:
 328                                                                 {
 329                                                                         auto& mouse_button = e.mouseButton;
 330                                                                         sink_->on_interaction(spl::make_shared<core::mouse_button_event>(
 331                                                                                         1,
 332                                                                                         static_cast<double>(mouse_button.x) / screen_width_,
 333                                                                                         static_cast<double>(mouse_button.y) / screen_height_,
 334                                                                                         static_cast<int>(mouse_button.button),
 335                                                                                         e.type == sf::Event::MouseButtonPressed));
 336                                                                 }
 337                                                                 break;
 338                                                         case sf::Event::MouseWheelMoved:
 339                                                                 {
 340                                                                         auto& wheel_moved = e.mouseWheel;
 341                                                                         sink_->on_interaction(spl::make_shared<core::mouse_wheel_event>(
 342                                                                                         1,
 343                                                                                         static_cast<double>(wheel_moved.x) / screen_width_,
 344                                                                                         static_cast<double>(wheel_moved.y) / screen_height_,
 345                                                                                         wheel_moved.delta));
 346                                                                 }
 347                                                                 break;
 348                                                         }
 349                                                 }
 350                                         }
 351
 352                                         auto frame = core::const_frame::empty();
 353                                         frame_buffer_.pop(frame);
 354
 355                                         render_and_draw_frame(frame);
 356
 357                                         /*perf_timer_.restart();
 358                                         render(frame);
 359                                         graph_->set_value("frame-time", perf_timer_.elapsed()*format_desc_.fps*0.5);
 360
 361                                         window_.Display();*/
 362
 363                                         graph_->set_value("tick-time", tick_timer_.elapsed()*format_desc_.fps*0.5);
 364                                         tick_timer_.restart();
 365                                 }
 366                                 catch(...)
 367                                 {
 368                                         CASPAR_LOG_CURRENT_EXCEPTION();
 369                                         is_running_ = false;
 370                                 }
 371                         }
 372
 373                         uninit();
 374                 }
 375                 catch(...)
 376                 {
 377                         CASPAR_LOG_CURRENT_EXCEPTION();
 378                 }
 379         }
 380
 381         void try_sleep_almost_until_vblank()
 382         {
 383                 static const double THRESHOLD = 0.003;
 384                 double threshold = config_.vsync ? THRESHOLD : 0.0;
 385
 386                 auto frame_time = 1.0 / (format_desc_.fps * format_desc_.field_count);
 387
 388                 wait_timer_.tick(frame_time - threshold);
 389         }
 390
 391         void wait_for_vblank_and_display()
 392         {
 393                 try_sleep_almost_until_vblank();
 394                 window_.display();
 395                 // Make sure that the next tick measures the duration from this point in time.
 396                 wait_timer_.tick(0.0);
 397         }
 398
 399         spl::shared_ptr<AVFrame> get_av_frame()
 400         {
 401                 spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);
 402                 avcodec_get_frame_defaults(av_frame.get());
 403
 404                 av_frame->linesize[0]           = format_desc_.width*4;
 405                 av_frame->format                        = PIX_FMT_BGRA;
 406                 av_frame->width                         = format_desc_.width;
 407                 av_frame->height                        = format_desc_.height;
 408                 av_frame->interlaced_frame      = format_desc_.field_mode != core::field_mode::progressive;
 409                 av_frame->top_field_first       = format_desc_.field_mode == core::field_mode::upper ? 1 : 0;
 410
 411                 return av_frame;
 412         }
 413
 414         void render_and_draw_frame(core::const_frame frame)
 415         {
 416                 if(static_cast<size_t>(frame.image_data().size()) != format_desc_.size)
 417                         return;
 418
 419                 if(screen_width_ == 0 && screen_height_ == 0)
 420                         return;
 421
 422                 perf_timer_.restart();
 423                 auto av_frame = get_av_frame();
 424                 av_frame->data[0] = const_cast<uint8_t*>(frame.image_data().begin());
 425
 426                 filter_.push(av_frame);
 427                 auto frames = filter_.poll_all();
 428
 429                 if (frames.empty())
 430                         return;
 431
 432                 if (frames.size() == 1)
 433                 {
 434                         render(frames[0]);
 435                         graph_->set_value("frame-time", perf_timer_.elapsed() * format_desc_.fps * 0.5);
 436
 437                         wait_for_vblank_and_display(); // progressive frame
 438                 }
 439                 else if (frames.size() == 2)
 440                 {
 441                         render(frames[0]);
 442                         double perf_elapsed = perf_timer_.elapsed();
 443
 444                         wait_for_vblank_and_display(); // field1
 445
 446                         perf_timer_.restart();
 447                         render(frames[1]);
 448                         perf_elapsed += perf_timer_.elapsed();
 449                         graph_->set_value("frame-time", perf_elapsed * format_desc_.fps * 0.5);
 450
 451                         wait_for_vblank_and_display(); // field2
 452                 }
 453         }
 454
 455         void render(spl::shared_ptr<AVFrame> av_frame)
 456         {
 457                 GL(glBindTexture(GL_TEXTURE_2D, texture_));
 458
 459                 GL(glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbos_[0]));
 460                 GL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, format_desc_.width, format_desc_.height, GL_BGRA, GL_UNSIGNED_BYTE, 0));
 461
 462                 GL(glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbos_[1]));
 463                 GL(glBufferData(GL_PIXEL_UNPACK_BUFFER, format_desc_.size, 0, GL_STREAM_DRAW));
 464
 465                 auto ptr = reinterpret_cast<char*>(GL2(glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY)));
 466                 if(ptr)
 467                 {
 468                         if(config_.key_only)
 469                         {
 470                                 tbb::parallel_for(tbb::blocked_range<int>(0, format_desc_.height), [&](const tbb::blocked_range<int>& r)
 471                                 {
 472                                         for(int n = r.begin(); n != r.end(); ++n)
 473                                                 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);
 474                                 });
 475                         }
 476                         else
 477                         {
 478                                 tbb::parallel_for(tbb::blocked_range<int>(0, format_desc_.height), [&](const tbb::blocked_range<int>& r)
 479                                 {
 480                                         for(int n = r.begin(); n != r.end(); ++n)
 481                                                 A_memcpy(ptr+n*format_desc_.width*4, av_frame->data[0]+n*av_frame->linesize[0], format_desc_.width*4);
 482                                 });
 483                         }
 484
 485                         GL(glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER)); // release the mapped buffer
 486                 }
 487
 488                 GL(glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0));
 489
 490                 GL(glClear(GL_COLOR_BUFFER_BIT));
 491                 glBegin(GL_QUADS);
 492                                 glTexCoord2f(0.0f,        1.0f);        glVertex2f(-width_, -height_);
 493                                 glTexCoord2f(1.0f,        1.0f);        glVertex2f( width_, -height_);
 494                                 glTexCoord2f(1.0f,        0.0f);        glVertex2f( width_,  height_);
 495                                 glTexCoord2f(0.0f,        0.0f);        glVertex2f(-width_,  height_);
 496                 glEnd();
 497
 498                 GL(glBindTexture(GL_TEXTURE_2D, 0));
 499
 500                 std::rotate(pbos_.begin(), pbos_.begin() + 1, pbos_.end());
 501         }
 502
 503
 504         std::future<bool> send(core::const_frame frame)
 505         {
 506                 if(!frame_buffer_.try_push(frame))
 507                         graph_->set_tag("dropped-frame");
 508
 509                 return make_ready_future(is_running_.load());
 510         }
 511
 512         std::wstring channel_and_format() const
 513         {
 514                 return L"[" + boost::lexical_cast<std::wstring>(channel_index_) + L"|" + format_desc_.name + L"]";
 515         }
 516
 517         std::wstring print() const
 518         {
 519                 return config_.name + channel_and_format();
 520         }
 521
 522         void calculate_aspect()
 523         {
 524                 if(config_.windowed)
 525                 {
 526                         screen_height_ = window_.getSize().y;
 527                         screen_width_ = window_.getSize().x;
 528                 }
 529
 530                 GL(glViewport(0, 0, screen_width_, screen_height_));
 531
 532                 std::pair<float, float> target_ratio = None();
 533                 if (config_.stretch == screen::stretch::fill)
 534                         target_ratio = Fill();
 535                 else if (config_.stretch == screen::stretch::uniform)
 536                         target_ratio = Uniform();
 537                 else if (config_.stretch == screen::stretch::uniform_to_fill)
 538                         target_ratio = UniformToFill();
 539
 540                 width_ = target_ratio.first;
 541                 height_ = target_ratio.second;
 542         }
 543
 544         std::pair<float, float> None()
 545         {
 546                 float width = static_cast<float>(square_width_)/static_cast<float>(screen_width_);
 547                 float height = static_cast<float>(square_height_)/static_cast<float>(screen_height_);
 548
 549                 return std::make_pair(width, height);
 550         }
 551
 552         std::pair<float, float> Uniform()
 553         {
 554                 float aspect = static_cast<float>(square_width_)/static_cast<float>(square_height_);
 555                 float width = std::min(1.0f, static_cast<float>(screen_height_)*aspect/static_cast<float>(screen_width_));
 556                 float height = static_cast<float>(screen_width_*width)/static_cast<float>(screen_height_*aspect);
 557
 558                 return std::make_pair(width, height);
 559         }
 560
 561         std::pair<float, float> Fill()
 562         {
 563                 return std::make_pair(1.0f, 1.0f);
 564         }
 565
 566         std::pair<float, float> UniformToFill()
 567         {
 568                 float wr = static_cast<float>(square_width_)/static_cast<float>(screen_width_);
 569                 float hr = static_cast<float>(square_height_)/static_cast<float>(screen_height_);
 570                 float r_inv = 1.0f/std::min(wr, hr);
 571
 572                 float width = wr*r_inv;
 573                 float height = hr*r_inv;
 574
 575                 return std::make_pair(width, height);
 576         }
 577 };
 578
 579
 580 struct screen_consumer_proxy : public core::frame_consumer
 581 {
 582         core::monitor::subject                          monitor_subject_;
 583         const configuration                                     config_;
 584         std::unique_ptr<screen_consumer>        consumer_;
 585         core::interaction_sink*                         sink_;
 586
 587 public:
 588
 589         screen_consumer_proxy(const configuration& config, core::interaction_sink* sink)
 590                 : config_(config)
 591                 , sink_(sink)
 592         {
 593         }
 594
 595         // frame_consumer
 596
 597         void initialize(const core::video_format_desc& format_desc, int channel_index) override
 598         {
 599                 consumer_.reset();
 600                 consumer_.reset(new screen_consumer(config_, format_desc, channel_index, sink_));
 601         }
 602
 603         std::future<bool> send(core::const_frame frame) override
 604         {
 605                 return consumer_->send(frame);
 606         }
 607
 608         std::wstring print() const override
 609         {
 610                 return consumer_ ? consumer_->print() : L"[screen_consumer]";
 611         }
 612
 613         std::wstring name() const override
 614         {
 615                 return L"screen";
 616         }
 617
 618         boost::property_tree::wptree info() const override
 619         {
 620                 boost::property_tree::wptree info;
 621                 info.add(L"type", L"screen");
 622                 info.add(L"key-only", config_.key_only);
 623                 info.add(L"windowed", config_.windowed);
 624                 info.add(L"auto-deinterlace", config_.auto_deinterlace);
 625                 return info;
 626         }
 627
 628         bool has_synchronization_clock() const override
 629         {
 630                 return false;
 631         }
 632
 633         int buffer_depth() const override
 634         {
 635                 return 1;
 636         }
 637
 638         int index() const override
 639         {
 640                 return 600 + (config_.key_only ? 10 : 0) + config_.screen_index;
 641         }
 642
 643         core::monitor::subject& monitor_output()
 644         {
 645                 return monitor_subject_;
 646         }
 647 };
 648
 649 spl::shared_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params, core::interaction_sink* sink)
 650 {
 651         if (params.size() < 1 || !boost::iequals(params.at(0), L"SCREEN"))
 652                 return core::frame_consumer::empty();
 653
 654         configuration config;
 655
 656         if (params.size() > 1)
 657                 config.screen_index = boost::lexical_cast<int>(params.at(1));
 658
 659         config.windowed         = !contains_param(L"FULLSCREEN", params);
 660         config.key_only         =  contains_param(L"KEY_ONLY", params);
 661         config.interactive      = !contains_param(L"NON_INTERACTIVE", params);
 662
 663         if (contains_param(L"NAME", params))
 664                 config.name = get_param(L"NAME", params);
 665
 666         return spl::make_shared<screen_consumer_proxy>(config, sink);
 667 }
 668
 669 spl::shared_ptr<core::frame_consumer> create_preconfigured_consumer(const boost::property_tree::wptree& ptree, core::interaction_sink* sink)
 670 {
 671         configuration config;
 672         config.name                             = ptree.get(L"name",                            config.name);
 673         config.screen_index             = ptree.get(L"device",                          config.screen_index + 1) - 1;
 674         config.windowed                 = ptree.get(L"windowed",                        config.windowed);
 675         config.key_only                 = ptree.get(L"key-only",                        config.key_only);
 676         config.auto_deinterlace = ptree.get(L"auto-deinterlace",        config.auto_deinterlace);
 677         config.vsync                    = ptree.get(L"vsync",                           config.vsync);
 678         config.interactive              = ptree.get(L"interactive",                     config.interactive);
 679
 680         auto stretch_str = ptree.get(L"stretch", L"default");
 681         if(stretch_str == L"uniform")
 682                 config.stretch = screen::stretch::uniform;
 683         else if(stretch_str == L"uniform_to_fill")
 684                 config.stretch = screen::stretch::uniform_to_fill;
 685
 686         auto aspect_str = ptree.get(L"aspect-ratio", L"default");
 687         if(aspect_str == L"16:9")
 688                 config.aspect = configuration::aspect_ratio::aspect_16_9;
 689         else if(aspect_str == L"4:3")
 690                 config.aspect = configuration::aspect_ratio::aspect_4_3;
 691
 692         return spl::make_shared<screen_consumer_proxy>(config, sink);
 693 }
 694
 695 }}