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