git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/util/util.cpp

   1 /*\r
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 * This file is part of CasparCG (www.casparcg.com).\r
   5 *\r
   6 * CasparCG is free software: you can redistribute it and/or modify\r
   7 * it under the terms of the GNU General Public License as published by\r
   8 * the Free Software Foundation, either version 3 of the License, or\r
   9 * (at your option) any later version.\r
  10 *\r
  11 * CasparCG is distributed in the hope that it will be useful,\r
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14 * GNU General Public License for more details.\r
  15 *\r
  16 * You should have received a copy of the GNU General Public License\r
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.\r
  18 *\r
  19 * Author: Robert Nagy, ronag89@gmail.com\r
  20 */\r
  21 \r
  22 #include "../../stdafx.h"\r
  23 \r
  24 #include "util.h"\r
  25 \r
  26 #include "flv.h"\r
  27 \r
  28 #include "../tbb_avcodec.h"\r
  29 #include "../../ffmpeg_error.h"\r
  30 \r
  31 #include <tbb/concurrent_unordered_map.h>\r
  32 #include <tbb/concurrent_queue.h>\r
  33 \r
  34 #include <core/frame/frame_transform.h>\r
  35 #include <core/frame/frame_factory.h>\r
  36 #include <core/producer/frame_producer.h>\r
  37 #include <core/frame/write_frame.h>\r
  38 \r
  39 #include <common/except.h>\r
  40 \r
  41 #include <tbb/parallel_for.h>\r
  42 \r
  43 #include <common/assert.h>\r
  44 #include <boost/filesystem.hpp>\r
  45 #include <boost/lexical_cast.hpp>\r
  46 \r
  47 #include <asmlib.h>\r
  48 \r
  49 #if defined(_MSC_VER)\r
  50 #pragma warning (push)\r
  51 #pragma warning (disable : 4244)\r
  52 #endif\r
  53 extern "C" \r
  54 {\r
  55         #include <libswscale/swscale.h>\r
  56         #include <libavcodec/avcodec.h>\r
  57         #include <libavformat/avformat.h>\r
  58 }\r
  59 #if defined(_MSC_VER)\r
  60 #pragma warning (pop)\r
  61 #endif\r
  62 \r
  63 namespace caspar { namespace ffmpeg {\r
  64                 \r
  65 std::shared_ptr<core::audio_buffer> flush_audio()\r
  66 {\r
  67         static std::shared_ptr<core::audio_buffer> audio(new core::audio_buffer());\r
  68         return audio;\r
  69 }\r
  70 \r
  71 std::shared_ptr<core::audio_buffer> empty_audio()\r
  72 {\r
  73         static std::shared_ptr<core::audio_buffer> audio(new core::audio_buffer());\r
  74         return audio;\r
  75 }\r
  76 \r
  77 std::shared_ptr<AVFrame>                        flush_video()\r
  78 {\r
  79         static std::shared_ptr<AVFrame> video(avcodec_alloc_frame(), av_free);\r
  80         return video;\r
  81 }\r
  82 \r
  83 std::shared_ptr<AVFrame>                        empty_video()\r
  84 {\r
  85         static std::shared_ptr<AVFrame> video(avcodec_alloc_frame(), av_free);\r
  86         return video;\r
  87 }\r
  88 \r
  89 core::field_mode get_mode(const AVFrame& frame)\r
  90 {\r
  91         if(!frame.interlaced_frame)\r
  92                 return core::field_mode::progressive;\r
  93 \r
  94         return frame.top_field_first ? core::field_mode::upper : core::field_mode::lower;\r
  95 }\r
  96 \r
  97 core::pixel_format get_pixel_format(PixelFormat pix_fmt)\r
  98 {\r
  99         switch(pix_fmt)\r
 100         {\r
 101         case CASPAR_PIX_FMT_LUMA:       return core::pixel_format::luma;\r
 102         case PIX_FMT_GRAY8:                     return core::pixel_format::gray;\r
 103         case PIX_FMT_BGRA:                      return core::pixel_format::bgra;\r
 104         case PIX_FMT_ARGB:                      return core::pixel_format::argb;\r
 105         case PIX_FMT_RGBA:                      return core::pixel_format::rgba;\r
 106         case PIX_FMT_ABGR:                      return core::pixel_format::abgr;\r
 107         case PIX_FMT_YUV444P:           return core::pixel_format::ycbcr;\r
 108         case PIX_FMT_YUV422P:           return core::pixel_format::ycbcr;\r
 109         case PIX_FMT_YUV420P:           return core::pixel_format::ycbcr;\r
 110         case PIX_FMT_YUV411P:           return core::pixel_format::ycbcr;\r
 111         case PIX_FMT_YUV410P:           return core::pixel_format::ycbcr;\r
 112         case PIX_FMT_YUVA420P:          return core::pixel_format::ycbcra;\r
 113         default:                                        return core::pixel_format::invalid;\r
 114         }\r
 115 }\r
 116 \r
 117 core::pixel_format_desc get_pixel_format_desc(PixelFormat pix_fmt, int width, int height)\r
 118 {\r
 119         // Get linesizes\r
 120         AVPicture dummy_pict;   \r
 121         avpicture_fill(&dummy_pict, nullptr, pix_fmt == CASPAR_PIX_FMT_LUMA ? PIX_FMT_GRAY8 : pix_fmt, width, height);\r
 122 \r
 123         core::pixel_format_desc desc = get_pixel_format(pix_fmt);\r
 124                 \r
 125         switch(desc.format.value())\r
 126         {\r
 127         case core::pixel_format::gray:\r
 128         case core::pixel_format::luma:\r
 129                 {\r
 130                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));                                               \r
 131                         return desc;\r
 132                 }\r
 133         case core::pixel_format::bgra:\r
 134         case core::pixel_format::argb:\r
 135         case core::pixel_format::rgba:\r
 136         case core::pixel_format::abgr:\r
 137                 {\r
 138                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0]/4, height, 4));                                             \r
 139                         return desc;\r
 140                 }\r
 141         case core::pixel_format::ycbcr:\r
 142         case core::pixel_format::ycbcra:\r
 143                 {               \r
 144                         // Find chroma height\r
 145                         int size2 = static_cast<int>(dummy_pict.data[2] - dummy_pict.data[1]);\r
 146                         int h2 = size2/dummy_pict.linesize[1];                  \r
 147 \r
 148                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));\r
 149                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[1], h2, 1));\r
 150                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[2], h2, 1));\r
 151 \r
 152                         if(desc.format == core::pixel_format::ycbcra)                                           \r
 153                                 desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[3], height, 1));       \r
 154                         return desc;\r
 155                 }               \r
 156         default:                \r
 157                 desc.format = core::pixel_format::invalid;\r
 158                 return desc;\r
 159         }\r
 160 }\r
 161 \r
 162 int make_alpha_format(int format)\r
 163 {\r
 164         switch(get_pixel_format(static_cast<PixelFormat>(format)).value())\r
 165         {\r
 166         case core::pixel_format::ycbcr:\r
 167         case core::pixel_format::ycbcra:\r
 168                 return CASPAR_PIX_FMT_LUMA;\r
 169         default:\r
 170                 return format;\r
 171         }\r
 172 }\r
 173 \r
 174 spl::shared_ptr<core::write_frame> make_write_frame(const void* tag, const spl::shared_ptr<AVFrame>& decoded_frame, const spl::shared_ptr<core::frame_factory>& frame_factory, int flags)\r
 175 {                       \r
 176         static tbb::concurrent_unordered_map<int, tbb::concurrent_queue<std::shared_ptr<SwsContext>>> sws_contexts_;\r
 177         \r
 178         if(decoded_frame->width < 1 || decoded_frame->height < 1)\r
 179                 return frame_factory->create_frame(tag, core::pixel_format_desc(core::pixel_format::invalid));\r
 180 \r
 181         const auto width  = decoded_frame->width;\r
 182         const auto height = decoded_frame->height;\r
 183         auto desc                 = get_pixel_format_desc(static_cast<PixelFormat>(decoded_frame->format), width, height);\r
 184         \r
 185         if(flags & core::frame_producer::flags::alpha_only)\r
 186                 desc = get_pixel_format_desc(static_cast<PixelFormat>(make_alpha_format(decoded_frame->format)), width, height);\r
 187 \r
 188         std::shared_ptr<core::write_frame> write;\r
 189 \r
 190         if(desc.format == core::pixel_format::invalid)\r
 191         {\r
 192                 auto pix_fmt = static_cast<PixelFormat>(decoded_frame->format);\r
 193                 auto target_pix_fmt = PIX_FMT_BGRA;\r
 194 \r
 195                 if(pix_fmt == PIX_FMT_UYVY422)\r
 196                         target_pix_fmt = PIX_FMT_YUV422P;\r
 197                 else if(pix_fmt == PIX_FMT_YUYV422)\r
 198                         target_pix_fmt = PIX_FMT_YUV422P;\r
 199                 else if(pix_fmt == PIX_FMT_UYYVYY411)\r
 200                         target_pix_fmt = PIX_FMT_YUV411P;\r
 201                 else if(pix_fmt == PIX_FMT_YUV420P10)\r
 202                         target_pix_fmt = PIX_FMT_YUV420P;\r
 203                 else if(pix_fmt == PIX_FMT_YUV422P10)\r
 204                         target_pix_fmt = PIX_FMT_YUV422P;\r
 205                 else if(pix_fmt == PIX_FMT_YUV444P10)\r
 206                         target_pix_fmt = PIX_FMT_YUV444P;\r
 207                 \r
 208                 auto target_desc = get_pixel_format_desc(target_pix_fmt, width, height);\r
 209 \r
 210                 write = frame_factory->create_frame(tag, target_desc);\r
 211 \r
 212                 std::shared_ptr<SwsContext> sws_context;\r
 213 \r
 214                 //CASPAR_LOG(warning) << "Hardware accelerated color transform not supported.";\r
 215 \r
 216                 int key = ((width << 22) & 0xFFC00000) | ((height << 6) & 0x003FC000) | ((pix_fmt << 7) & 0x00007F00) | ((target_pix_fmt << 0) & 0x0000007F);\r
 217                         \r
 218                 auto& pool = sws_contexts_[key];\r
 219                                                 \r
 220                 if(!pool.try_pop(sws_context))\r
 221                 {\r
 222                         double param;\r
 223                         sws_context.reset(sws_getContext(width, height, pix_fmt, width, height, target_pix_fmt, SWS_BILINEAR, nullptr, nullptr, &param), sws_freeContext);\r
 224                 }\r
 225                         \r
 226                 if(!sws_context)\r
 227                 {\r
 228                         BOOST_THROW_EXCEPTION(operation_failed() << msg_info("Could not create software scaling context.") << \r
 229                                                                         boost::errinfo_api_function("sws_getContext"));\r
 230                 }       \r
 231                 \r
 232                 spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);      \r
 233                 avcodec_get_frame_defaults(av_frame.get());                     \r
 234                 if(target_pix_fmt == PIX_FMT_BGRA)\r
 235                 {\r
 236                         auto size = avpicture_fill(reinterpret_cast<AVPicture*>(av_frame.get()), write->image_data(0).begin(), PIX_FMT_BGRA, width, height);\r
 237                         CASPAR_VERIFY(size == write->image_data(0).size()); \r
 238                 }\r
 239                 else\r
 240                 {\r
 241                         av_frame->width  = width;\r
 242                         av_frame->height = height;\r
 243                         for(int n = 0; n < target_desc.planes.size(); ++n)\r
 244                         {\r
 245                                 av_frame->data[n]               = write->image_data(n).begin();\r
 246                                 av_frame->linesize[n]   = target_desc.planes[n].linesize;\r
 247                         }\r
 248                 }\r
 249 \r
 250                 sws_scale(sws_context.get(), decoded_frame->data, decoded_frame->linesize, 0, height, av_frame->data, av_frame->linesize);      \r
 251                 pool.push(sws_context); \r
 252         }\r
 253         else\r
 254         {\r
 255                 write = frame_factory->create_frame(tag, desc);\r
 256 \r
 257                 for(int n = 0; n < static_cast<int>(desc.planes.size()); ++n)\r
 258                 {\r
 259                         auto plane            = desc.planes[n];\r
 260                         auto result           = write->image_data(n).begin();\r
 261                         auto decoded          = decoded_frame->data[n];\r
 262                         auto decoded_linesize = decoded_frame->linesize[n];\r
 263                         \r
 264                         CASPAR_ASSERT(decoded);\r
 265                         CASPAR_ASSERT(write->image_data(n).begin());\r
 266 \r
 267                         // Copy line by line since ffmpeg sometimes pads each line.\r
 268                         tbb::affinity_partitioner ap;\r
 269                         tbb::parallel_for(tbb::blocked_range<int>(0, desc.planes[n].height), [&](const tbb::blocked_range<int>& r)\r
 270                         {\r
 271                                 for(int y = r.begin(); y != r.end(); ++y)\r
 272                                         A_memcpy(result + y*plane.linesize, decoded + y*decoded_linesize, plane.linesize);\r
 273                         }, ap);\r
 274                 }\r
 275         }\r
 276 \r
 277         if(decoded_frame->height == 480) // NTSC DV\r
 278         {\r
 279                 write->frame_transform().image_transform.fill_translation[1] += 2.0/static_cast<double>(frame_factory->video_format_desc().height);\r
 280                 write->frame_transform().image_transform.fill_scale[1] = 1.0 - 6.0*1.0/static_cast<double>(frame_factory->video_format_desc().height);\r
 281         }\r
 282         \r
 283         // Fix field-order if needed\r
 284         if(get_mode(*decoded_frame) == core::field_mode::lower && frame_factory->video_format_desc().field_mode == core::field_mode::upper)\r
 285                 write->frame_transform().image_transform.fill_translation[1] += 1.0/static_cast<double>(frame_factory->video_format_desc().height);\r
 286         else if(get_mode(*decoded_frame) == core::field_mode::upper && frame_factory->video_format_desc().field_mode == core::field_mode::lower)\r
 287                 write->frame_transform().image_transform.fill_translation[1] -= 1.0/static_cast<double>(frame_factory->video_format_desc().height);\r
 288 \r
 289         return spl::make_shared_ptr(write);\r
 290 }\r
 291 \r
 292 spl::shared_ptr<AVFrame> make_av_frame(caspar::core::data_frame& frame)\r
 293 {\r
 294         std::array<void*, 4> data = {};\r
 295         for(int n = 0; n < frame.get_pixel_format_desc().planes.size(); ++n)\r
 296                 data[n] = frame.image_data(n).begin();\r
 297 \r
 298         return make_av_frame(data, frame.get_pixel_format_desc());\r
 299 }\r
 300 \r
 301 spl::shared_ptr<AVFrame> make_av_frame(std::array<void*, 4> data, const core::pixel_format_desc& pix_desc)\r
 302 {\r
 303         spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);      \r
 304         avcodec_get_frame_defaults(av_frame.get());\r
 305         \r
 306         auto planes              = pix_desc.planes;\r
 307         auto format              = pix_desc.format.value();\r
 308 \r
 309         av_frame->width  = planes[0].width;\r
 310         av_frame->height = planes[0].height;\r
 311         for(int n = 0; n < planes.size(); ++n)  \r
 312         {\r
 313                 av_frame->data[n]         = reinterpret_cast<uint8_t*>(data[n]);\r
 314                 av_frame->linesize[n] = planes[n].linesize;     \r
 315         }\r
 316         switch(format)\r
 317         {\r
 318         case core::pixel_format::rgba:\r
 319                 av_frame->format = PIX_FMT_RGBA; \r
 320                 break;\r
 321         case core::pixel_format::argb:\r
 322                 av_frame->format = PIX_FMT_ARGB; \r
 323                 break;\r
 324         case core::pixel_format::bgra:\r
 325                 av_frame->format = PIX_FMT_BGRA; \r
 326                 break;\r
 327         case core::pixel_format::abgr:\r
 328                 av_frame->format = PIX_FMT_ABGR; \r
 329                 break;\r
 330         case core::pixel_format::gray:\r
 331                 av_frame->format = PIX_FMT_GRAY8; \r
 332                 break;\r
 333         case core::pixel_format::ycbcr:\r
 334         {\r
 335                 int y_w = planes[0].width;\r
 336                 int y_h = planes[0].height;\r
 337                 int c_w = planes[1].width;\r
 338                 int c_h = planes[1].height;\r
 339 \r
 340                 if(c_h == y_h && c_w == y_w)\r
 341                         av_frame->format = PIX_FMT_YUV444P;\r
 342                 else if(c_h == y_h && c_w*2 == y_w)\r
 343                         av_frame->format = PIX_FMT_YUV422P;\r
 344                 else if(c_h == y_h && c_w*4 == y_w)\r
 345                         av_frame->format = PIX_FMT_YUV411P;\r
 346                 else if(c_h*2 == y_h && c_w*2 == y_w)\r
 347                         av_frame->format = PIX_FMT_YUV420P;\r
 348                 else if(c_h*2 == y_h && c_w*4 == y_w)\r
 349                         av_frame->format = PIX_FMT_YUV410P;\r
 350 \r
 351                 break;\r
 352         }\r
 353         case core::pixel_format::ycbcra:\r
 354                 av_frame->format = PIX_FMT_YUVA420P;\r
 355                 break;\r
 356         }\r
 357         return av_frame;\r
 358 }\r
 359 \r
 360 bool is_sane_fps(AVRational time_base)\r
 361 {\r
 362         double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);\r
 363         return fps > 20.0 && fps < 65.0;\r
 364 }\r
 365 \r
 366 AVRational fix_time_base(AVRational time_base)\r
 367 {\r
 368         if(time_base.num == 1)\r
 369                 time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(time_base.den)))-1));    \r
 370                         \r
 371         if(!is_sane_fps(time_base))\r
 372         {\r
 373                 auto tmp = time_base;\r
 374                 tmp.den /= 2;\r
 375                 if(is_sane_fps(tmp))\r
 376                         time_base = tmp;\r
 377         }\r
 378 \r
 379         return time_base;\r
 380 }\r
 381 \r
 382 double read_fps(AVFormatContext& context, double fail_value)\r
 383 {                                               \r
 384         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 385         auto audio_index = av_find_best_stream(&context, AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0);\r
 386         \r
 387         if(video_index > -1)\r
 388         {\r
 389                 const auto video_context = context.streams[video_index]->codec;\r
 390                 const auto video_stream  = context.streams[video_index];\r
 391                                                 \r
 392                 AVRational time_base = video_context->time_base;\r
 393 \r
 394                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")\r
 395                 {\r
 396                         try\r
 397                         {\r
 398                                 auto meta = read_flv_meta_info(context.filename);\r
 399                                 return boost::lexical_cast<double>(meta["framerate"]);\r
 400                         }\r
 401                         catch(...)\r
 402                         {\r
 403                                 return 0.0;\r
 404                         }\r
 405                 }\r
 406                 else\r
 407                 {\r
 408                         time_base.num *= video_context->ticks_per_frame;\r
 409 \r
 410                         if(!is_sane_fps(time_base))\r
 411                         {                       \r
 412                                 time_base = fix_time_base(time_base);\r
 413 \r
 414                                 if(!is_sane_fps(time_base) && audio_index > -1)\r
 415                                 {\r
 416                                         auto& audio_context = *context.streams[audio_index]->codec;\r
 417                                         auto& audio_stream  = *context.streams[audio_index];\r
 418 \r
 419                                         double duration_sec = audio_stream.duration / static_cast<double>(audio_context.sample_rate);\r
 420                                                                 \r
 421                                         time_base.num = static_cast<int>(duration_sec*100000.0);\r
 422                                         time_base.den = static_cast<int>(video_stream->nb_frames*100000);\r
 423                                 }\r
 424                         }\r
 425                 }\r
 426                 \r
 427                 double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);\r
 428 \r
 429                 double closest_fps = 0.0;\r
 430                 for(int n = 0; n < core::video_format::count; ++n)\r
 431                 {\r
 432                         auto format = core::video_format_desc(core::video_format(n));\r
 433 \r
 434                         double diff1 = std::abs(format.fps - fps);\r
 435                         double diff2 = std::abs(closest_fps - fps);\r
 436 \r
 437                         if(diff1 < diff2)\r
 438                                 closest_fps = format.fps;\r
 439                 }\r
 440         \r
 441                 return closest_fps;\r
 442         }\r
 443 \r
 444         return fail_value;      \r
 445 }\r
 446 \r
 447 void fix_meta_data(AVFormatContext& context)\r
 448 {\r
 449         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 450 \r
 451         if(video_index > -1)\r
 452         {\r
 453                 auto video_stream   = context.streams[video_index];\r
 454                 auto video_context  = context.streams[video_index]->codec;\r
 455                                                 \r
 456                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")\r
 457                 {\r
 458                         try\r
 459                         {\r
 460                                 auto meta = read_flv_meta_info(context.filename);\r
 461                                 double fps = boost::lexical_cast<double>(meta["framerate"]);\r
 462                                 video_stream->nb_frames = static_cast<int64_t>(boost::lexical_cast<double>(meta["duration"])*fps);\r
 463                         }\r
 464                         catch(...){}\r
 465                 }\r
 466                 else\r
 467                 {\r
 468                         auto stream_time = video_stream->time_base;\r
 469                         auto duration    = video_stream->duration;\r
 470                         auto codec_time  = video_context->time_base;\r
 471                         auto ticks               = video_context->ticks_per_frame;\r
 472 \r
 473                         if(video_stream->nb_frames == 0)\r
 474                                 video_stream->nb_frames = (duration*stream_time.num*codec_time.den)/(stream_time.den*codec_time.num*ticks);     \r
 475                 }\r
 476         }\r
 477 }\r
 478 \r
 479 spl::shared_ptr<AVPacket> create_packet()\r
 480 {\r
 481         spl::shared_ptr<AVPacket> packet(new AVPacket, [](AVPacket* p)\r
 482         {\r
 483                 av_free_packet(p);\r
 484                 delete p;\r
 485         });\r
 486         \r
 487         av_init_packet(packet.get());\r
 488         return packet;\r
 489 }\r
 490 \r
 491 spl::shared_ptr<AVCodecContext> open_codec(AVFormatContext& context, enum AVMediaType type, int& index)\r
 492 {       \r
 493         AVCodec* decoder;\r
 494         index = THROW_ON_ERROR2(av_find_best_stream(&context, type, -1, -1, &decoder, 0), "");\r
 495         //if(strcmp(decoder->name, "prores") == 0 && decoder->next && strcmp(decoder->next->name, "prores_lgpl") == 0)\r
 496         //      decoder = decoder->next;\r
 497 \r
 498         THROW_ON_ERROR2(tbb_avcodec_open(context.streams[index]->codec, decoder), "");\r
 499         return spl::shared_ptr<AVCodecContext>(context.streams[index]->codec, tbb_avcodec_close);\r
 500 }\r
 501 \r
 502 spl::shared_ptr<AVFormatContext> open_input(const std::wstring& filename)\r
 503 {\r
 504         AVFormatContext* weak_context = nullptr;\r
 505         THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(filename).c_str(), nullptr, nullptr), filename);\r
 506         spl::shared_ptr<AVFormatContext> context(weak_context, av_close_input_file);                    \r
 507         THROW_ON_ERROR2(avformat_find_stream_info(weak_context, nullptr), filename);\r
 508         fix_meta_data(*context);\r
 509         return context;\r
 510 }\r
 511 \r
 512 std::wstring print_mode(int width, int height, double fps, bool interlaced)\r
 513 {\r
 514         std::wostringstream fps_ss;\r
 515         fps_ss << std::fixed << std::setprecision(2) << (!interlaced ? fps : 2.0 * fps);\r
 516 \r
 517         return boost::lexical_cast<std::wstring>(width) + L"x" + boost::lexical_cast<std::wstring>(height) + (!interlaced ? L"p" : L"i") + fps_ss.str();\r
 518 }\r
 519 \r
 520 bool is_valid_file(const std::wstring filename)\r
 521 {                       \r
 522         if(boost::filesystem::path(filename).extension() == ".m2t")\r
 523                 return true;\r
 524 \r
 525         std::ifstream file(filename);\r
 526 \r
 527         std::vector<unsigned char> buf;\r
 528         for(auto file_it = std::istreambuf_iterator<char>(file); file_it != std::istreambuf_iterator<char>() && buf.size() < 2048; ++file_it)\r
 529                 buf.push_back(*file_it);\r
 530 \r
 531         if(buf.empty())\r
 532                 return nullptr;\r
 533 \r
 534         AVProbeData pb;\r
 535         pb.filename = u8(filename).c_str();\r
 536         pb.buf          = buf.data();\r
 537         pb.buf_size = static_cast<int>(buf.size());\r
 538 \r
 539         int score = 0;\r
 540         return av_probe_input_format2(&pb, true, &score) != nullptr;\r
 541 }\r
 542 \r
 543 std::wstring probe_stem(const std::wstring stem)\r
 544 {\r
 545         auto stem2 = boost::filesystem::path(stem);\r
 546         auto dir = stem2.parent_path();\r
 547         for(auto it = boost::filesystem::directory_iterator(dir); it != boost::filesystem::directory_iterator(); ++it)\r
 548         {\r
 549                 if(boost::iequals(it->path().stem().wstring(), stem2.filename().wstring()) && is_valid_file(it->path().wstring()))\r
 550                         return it->path().wstring();\r
 551         }\r
 552         return L"";\r
 553 }\r
 554 //\r
 555 //void av_dup_frame(AVFrame* frame)\r
 556 //{\r
 557 //      AVFrame* new_frame = avcodec_alloc_frame();\r
 558 //\r
 559 //\r
 560 //      const uint8_t *src_data[4] = {0};\r
 561 //      memcpy(const_cast<uint8_t**>(&src_data[0]), frame->data, 4);\r
 562 //      const int src_linesizes[4] = {0};\r
 563 //      memcpy(const_cast<int*>(&src_linesizes[0]), frame->linesize, 4);\r
 564 //\r
 565 //      av_image_alloc(new_frame->data, new_frame->linesize, new_frame->width, new_frame->height, frame->format, 16);\r
 566 //\r
 567 //      av_image_copy(new_frame->data, new_frame->linesize, src_data, src_linesizes, frame->format, new_frame->width, new_frame->height);\r
 568 //\r
 569 //      frame =\r
 570 //}\r
 571 \r
 572 }}