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