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/frame/data_frame.h>\r
  37 #include <core/producer/frame_producer.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 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::unique_ptr<core::data_frame> make_data_frame(const void* tag, const spl::shared_ptr<AVFrame>& decoded_frame, double fps, 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                 = 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 = pixel_format_desc(static_cast<PixelFormat>(make_alpha_format(decoded_frame->format)), width, height);\r
 187         \r
 188         if(desc.format == core::pixel_format::invalid)\r
 189         {\r
 190                 auto pix_fmt = static_cast<PixelFormat>(decoded_frame->format);\r
 191                 auto target_pix_fmt = PIX_FMT_BGRA;\r
 192 \r
 193                 if(pix_fmt == PIX_FMT_UYVY422)\r
 194                         target_pix_fmt = PIX_FMT_YUV422P;\r
 195                 else if(pix_fmt == PIX_FMT_YUYV422)\r
 196                         target_pix_fmt = PIX_FMT_YUV422P;\r
 197                 else if(pix_fmt == PIX_FMT_UYYVYY411)\r
 198                         target_pix_fmt = PIX_FMT_YUV411P;\r
 199                 else if(pix_fmt == PIX_FMT_YUV420P10)\r
 200                         target_pix_fmt = PIX_FMT_YUV420P;\r
 201                 else if(pix_fmt == PIX_FMT_YUV422P10)\r
 202                         target_pix_fmt = PIX_FMT_YUV422P;\r
 203                 else if(pix_fmt == PIX_FMT_YUV444P10)\r
 204                         target_pix_fmt = PIX_FMT_YUV444P;\r
 205                 \r
 206                 auto target_desc = pixel_format_desc(target_pix_fmt, width, height);\r
 207 \r
 208                 auto write = frame_factory->create_frame(tag, target_desc, fps, get_mode(*decoded_frame));\r
 209 \r
 210                 std::shared_ptr<SwsContext> sws_context;\r
 211 \r
 212                 //CASPAR_LOG(warning) << "Hardware accelerated color transform not supported.";\r
 213 \r
 214                 int key = ((width << 22) & 0xFFC00000) | ((height << 6) & 0x003FC000) | ((pix_fmt << 7) & 0x00007F00) | ((target_pix_fmt << 0) & 0x0000007F);\r
 215                         \r
 216                 auto& pool = sws_contexts_[key];\r
 217                                                 \r
 218                 if(!pool.try_pop(sws_context))\r
 219                 {\r
 220                         double param;\r
 221                         sws_context.reset(sws_getContext(width, height, pix_fmt, width, height, target_pix_fmt, SWS_BILINEAR, nullptr, nullptr, &param), sws_freeContext);\r
 222                 }\r
 223                         \r
 224                 if(!sws_context)\r
 225                 {\r
 226                         BOOST_THROW_EXCEPTION(operation_failed() << msg_info("Could not create software scaling context.") << \r
 227                                                                         boost::errinfo_api_function("sws_getContext"));\r
 228                 }       \r
 229                 \r
 230                 spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);      \r
 231                 avcodec_get_frame_defaults(av_frame.get());                     \r
 232                 if(target_pix_fmt == PIX_FMT_BGRA)\r
 233                 {\r
 234                         auto size = avpicture_fill(reinterpret_cast<AVPicture*>(av_frame.get()), write->image_data(0).begin(), PIX_FMT_BGRA, width, height);\r
 235                         CASPAR_VERIFY(size == write->image_data(0).size()); \r
 236                 }\r
 237                 else\r
 238                 {\r
 239                         av_frame->width  = width;\r
 240                         av_frame->height = height;\r
 241                         for(int n = 0; n < target_desc.planes.size(); ++n)\r
 242                         {\r
 243                                 av_frame->data[n]               = write->image_data(n).begin();\r
 244                                 av_frame->linesize[n]   = target_desc.planes[n].linesize;\r
 245                         }\r
 246                 }\r
 247 \r
 248                 sws_scale(sws_context.get(), decoded_frame->data, decoded_frame->linesize, 0, height, av_frame->data, av_frame->linesize);      \r
 249                 pool.push(sws_context); \r
 250 \r
 251                 return std::move(write);\r
 252         }\r
 253         else\r
 254         {\r
 255                 auto write = frame_factory->create_frame(tag, desc, fps, get_mode(*decoded_frame));\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                 return std::move(write);\r
 277         }\r
 278 }\r
 279 \r
 280 spl::shared_ptr<AVFrame> make_av_frame(caspar::core::data_frame& frame)\r
 281 {\r
 282         std::array<void*, 4> data = {};\r
 283         for(int n = 0; n < frame.pixel_format_desc().planes.size(); ++n)\r
 284                 data[n] = frame.image_data(n).begin();\r
 285 \r
 286         return make_av_frame(data, frame.pixel_format_desc());\r
 287 }\r
 288 \r
 289 spl::shared_ptr<AVFrame> make_av_frame(std::array<void*, 4> data, const core::pixel_format_desc& pix_desc)\r
 290 {\r
 291         spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);      \r
 292         avcodec_get_frame_defaults(av_frame.get());\r
 293         \r
 294         auto planes              = pix_desc.planes;\r
 295         auto format              = pix_desc.format.value();\r
 296 \r
 297         av_frame->width  = planes[0].width;\r
 298         av_frame->height = planes[0].height;\r
 299         for(int n = 0; n < planes.size(); ++n)  \r
 300         {\r
 301                 av_frame->data[n]         = reinterpret_cast<uint8_t*>(data[n]);\r
 302                 av_frame->linesize[n] = planes[n].linesize;     \r
 303         }\r
 304         switch(format)\r
 305         {\r
 306         case core::pixel_format::rgba:\r
 307                 av_frame->format = PIX_FMT_RGBA; \r
 308                 break;\r
 309         case core::pixel_format::argb:\r
 310                 av_frame->format = PIX_FMT_ARGB; \r
 311                 break;\r
 312         case core::pixel_format::bgra:\r
 313                 av_frame->format = PIX_FMT_BGRA; \r
 314                 break;\r
 315         case core::pixel_format::abgr:\r
 316                 av_frame->format = PIX_FMT_ABGR; \r
 317                 break;\r
 318         case core::pixel_format::gray:\r
 319                 av_frame->format = PIX_FMT_GRAY8; \r
 320                 break;\r
 321         case core::pixel_format::ycbcr:\r
 322         {\r
 323                 int y_w = planes[0].width;\r
 324                 int y_h = planes[0].height;\r
 325                 int c_w = planes[1].width;\r
 326                 int c_h = planes[1].height;\r
 327 \r
 328                 if(c_h == y_h && c_w == y_w)\r
 329                         av_frame->format = PIX_FMT_YUV444P;\r
 330                 else if(c_h == y_h && c_w*2 == y_w)\r
 331                         av_frame->format = PIX_FMT_YUV422P;\r
 332                 else if(c_h == y_h && c_w*4 == y_w)\r
 333                         av_frame->format = PIX_FMT_YUV411P;\r
 334                 else if(c_h*2 == y_h && c_w*2 == y_w)\r
 335                         av_frame->format = PIX_FMT_YUV420P;\r
 336                 else if(c_h*2 == y_h && c_w*4 == y_w)\r
 337                         av_frame->format = PIX_FMT_YUV410P;\r
 338 \r
 339                 break;\r
 340         }\r
 341         case core::pixel_format::ycbcra:\r
 342                 av_frame->format = PIX_FMT_YUVA420P;\r
 343                 break;\r
 344         }\r
 345         return av_frame;\r
 346 }\r
 347 \r
 348 bool is_sane_fps(AVRational time_base)\r
 349 {\r
 350         double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);\r
 351         return fps > 20.0 && fps < 65.0;\r
 352 }\r
 353 \r
 354 AVRational fix_time_base(AVRational time_base)\r
 355 {\r
 356         if(time_base.num == 1)\r
 357                 time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(time_base.den)))-1));    \r
 358                         \r
 359         if(!is_sane_fps(time_base))\r
 360         {\r
 361                 auto tmp = time_base;\r
 362                 tmp.den /= 2;\r
 363                 if(is_sane_fps(tmp))\r
 364                         time_base = tmp;\r
 365         }\r
 366 \r
 367         return time_base;\r
 368 }\r
 369 \r
 370 double read_fps(AVFormatContext& context, double fail_value)\r
 371 {                                               \r
 372         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 373         auto audio_index = av_find_best_stream(&context, AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0);\r
 374         \r
 375         if(video_index > -1)\r
 376         {\r
 377                 const auto video_context = context.streams[video_index]->codec;\r
 378                 const auto video_stream  = context.streams[video_index];\r
 379                                                 \r
 380                 AVRational time_base = video_context->time_base;\r
 381 \r
 382                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")\r
 383                 {\r
 384                         try\r
 385                         {\r
 386                                 auto meta = read_flv_meta_info(context.filename);\r
 387                                 return boost::lexical_cast<double>(meta["framerate"]);\r
 388                         }\r
 389                         catch(...)\r
 390                         {\r
 391                                 return 0.0;\r
 392                         }\r
 393                 }\r
 394                 else\r
 395                 {\r
 396                         time_base.num *= video_context->ticks_per_frame;\r
 397 \r
 398                         if(!is_sane_fps(time_base))\r
 399                         {                       \r
 400                                 time_base = fix_time_base(time_base);\r
 401 \r
 402                                 if(!is_sane_fps(time_base) && audio_index > -1)\r
 403                                 {\r
 404                                         auto& audio_context = *context.streams[audio_index]->codec;\r
 405                                         auto& audio_stream  = *context.streams[audio_index];\r
 406 \r
 407                                         double duration_sec = audio_stream.duration / static_cast<double>(audio_context.sample_rate);\r
 408                                                                 \r
 409                                         time_base.num = static_cast<int>(duration_sec*100000.0);\r
 410                                         time_base.den = static_cast<int>(video_stream->nb_frames*100000);\r
 411                                 }\r
 412                         }\r
 413                 }\r
 414                 \r
 415                 double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);\r
 416 \r
 417                 double closest_fps = 0.0;\r
 418                 for(int n = 0; n < core::video_format::count; ++n)\r
 419                 {\r
 420                         auto format = core::video_format_desc(core::video_format(n));\r
 421 \r
 422                         double diff1 = std::abs(format.fps - fps);\r
 423                         double diff2 = std::abs(closest_fps - fps);\r
 424 \r
 425                         if(diff1 < diff2)\r
 426                                 closest_fps = format.fps;\r
 427                 }\r
 428         \r
 429                 return closest_fps;\r
 430         }\r
 431 \r
 432         return fail_value;      \r
 433 }\r
 434 \r
 435 void fix_meta_data(AVFormatContext& context)\r
 436 {\r
 437         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 438 \r
 439         if(video_index > -1)\r
 440         {\r
 441                 auto video_stream   = context.streams[video_index];\r
 442                 auto video_context  = context.streams[video_index]->codec;\r
 443                                                 \r
 444                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")\r
 445                 {\r
 446                         try\r
 447                         {\r
 448                                 auto meta = read_flv_meta_info(context.filename);\r
 449                                 double fps = boost::lexical_cast<double>(meta["framerate"]);\r
 450                                 video_stream->nb_frames = static_cast<int64_t>(boost::lexical_cast<double>(meta["duration"])*fps);\r
 451                         }\r
 452                         catch(...){}\r
 453                 }\r
 454                 else\r
 455                 {\r
 456                         auto stream_time = video_stream->time_base;\r
 457                         auto duration    = video_stream->duration;\r
 458                         auto codec_time  = video_context->time_base;\r
 459                         auto ticks               = video_context->ticks_per_frame;\r
 460 \r
 461                         if(video_stream->nb_frames == 0)\r
 462                                 video_stream->nb_frames = (duration*stream_time.num*codec_time.den)/(stream_time.den*codec_time.num*ticks);     \r
 463                 }\r
 464         }\r
 465 }\r
 466 \r
 467 spl::shared_ptr<AVPacket> create_packet()\r
 468 {\r
 469         spl::shared_ptr<AVPacket> packet(new AVPacket, [](AVPacket* p)\r
 470         {\r
 471                 av_free_packet(p);\r
 472                 delete p;\r
 473         });\r
 474         \r
 475         av_init_packet(packet.get());\r
 476         return packet;\r
 477 }\r
 478 \r
 479 spl::shared_ptr<AVCodecContext> open_codec(AVFormatContext& context, enum AVMediaType type, int& index)\r
 480 {       \r
 481         AVCodec* decoder;\r
 482         index = THROW_ON_ERROR2(av_find_best_stream(&context, type, -1, -1, &decoder, 0), "");\r
 483         //if(strcmp(decoder->name, "prores") == 0 && decoder->next && strcmp(decoder->next->name, "prores_lgpl") == 0)\r
 484         //      decoder = decoder->next;\r
 485 \r
 486         THROW_ON_ERROR2(tbb_avcodec_open(context.streams[index]->codec, decoder), "");\r
 487         return spl::shared_ptr<AVCodecContext>(context.streams[index]->codec, tbb_avcodec_close);\r
 488 }\r
 489 \r
 490 spl::shared_ptr<AVFormatContext> open_input(const std::wstring& filename)\r
 491 {\r
 492         AVFormatContext* weak_context = nullptr;\r
 493         THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(filename).c_str(), nullptr, nullptr), filename);\r
 494         spl::shared_ptr<AVFormatContext> context(weak_context, av_close_input_file);                    \r
 495         THROW_ON_ERROR2(avformat_find_stream_info(weak_context, nullptr), filename);\r
 496         fix_meta_data(*context);\r
 497         return context;\r
 498 }\r
 499 \r
 500 std::wstring print_mode(int width, int height, double fps, bool interlaced)\r
 501 {\r
 502         std::wostringstream fps_ss;\r
 503         fps_ss << std::fixed << std::setprecision(2) << (!interlaced ? fps : 2.0 * fps);\r
 504 \r
 505         return boost::lexical_cast<std::wstring>(width) + L"x" + boost::lexical_cast<std::wstring>(height) + (!interlaced ? L"p" : L"i") + fps_ss.str();\r
 506 }\r
 507 \r
 508 bool is_valid_file(const std::wstring filename)\r
 509 {                       \r
 510         if(boost::filesystem::path(filename).extension() == ".m2t")\r
 511                 return true;\r
 512 \r
 513         std::ifstream file(filename);\r
 514 \r
 515         std::vector<unsigned char> buf;\r
 516         for(auto file_it = std::istreambuf_iterator<char>(file); file_it != std::istreambuf_iterator<char>() && buf.size() < 2048; ++file_it)\r
 517                 buf.push_back(*file_it);\r
 518 \r
 519         if(buf.empty())\r
 520                 return nullptr;\r
 521 \r
 522         AVProbeData pb;\r
 523         pb.filename = u8(filename).c_str();\r
 524         pb.buf          = buf.data();\r
 525         pb.buf_size = static_cast<int>(buf.size());\r
 526 \r
 527         int score = 0;\r
 528         return av_probe_input_format2(&pb, true, &score) != nullptr;\r
 529 }\r
 530 \r
 531 std::wstring probe_stem(const std::wstring stem)\r
 532 {\r
 533         auto stem2 = boost::filesystem::path(stem);\r
 534         auto dir = stem2.parent_path();\r
 535         for(auto it = boost::filesystem::directory_iterator(dir); it != boost::filesystem::directory_iterator(); ++it)\r
 536         {\r
 537                 if(boost::iequals(it->path().stem().wstring(), stem2.filename().wstring()) && is_valid_file(it->path().wstring()))\r
 538                         return it->path().wstring();\r
 539         }\r
 540         return L"";\r
 541 }\r
 542 //\r
 543 //void av_dup_frame(AVFrame* frame)\r
 544 //{\r
 545 //      AVFrame* new_frame = avcodec_alloc_frame();\r
 546 //\r
 547 //\r
 548 //      const uint8_t *src_data[4] = {0};\r
 549 //      memcpy(const_cast<uint8_t**>(&src_data[0]), frame->data, 4);\r
 550 //      const int src_linesizes[4] = {0};\r
 551 //      memcpy(const_cast<int*>(&src_linesizes[0]), frame->linesize, 4);\r
 552 //\r
 553 //      av_image_alloc(new_frame->data, new_frame->linesize, new_frame->width, new_frame->height, frame->format, 16);\r
 554 //\r
 555 //      av_image_copy(new_frame->data, new_frame->linesize, src_data, src_linesizes, frame->format, new_frame->width, new_frame->height);\r
 556 //\r
 557 //      frame =\r
 558 //}\r
 559 \r
 560 }}