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/frame.h>\r
  37 #include <core/producer/frame_producer.h>\r
  38 \r
  39 #include <common/except.h>\r
  40 #include <common/array.h>\r
  41 \r
  42 #include <tbb/parallel_for.h>\r
  43 \r
  44 #include <common/assert.h>\r
  45 #include <boost/filesystem.hpp>\r
  46 #include <boost/lexical_cast.hpp>\r
  47 \r
  48 #include <asmlib.h>\r
  49 \r
  50 #if defined(_MSC_VER)\r
  51 #pragma warning (push)\r
  52 #pragma warning (disable : 4244)\r
  53 #endif\r
  54 extern "C" \r
  55 {\r
  56         #include <libswscale/swscale.h>\r
  57         #include <libavcodec/avcodec.h>\r
  58         #include <libavformat/avformat.h>\r
  59 }\r
  60 #if defined(_MSC_VER)\r
  61 #pragma warning (pop)\r
  62 #endif\r
  63 \r
  64 namespace caspar { namespace ffmpeg {\r
  65                 \r
  66 std::shared_ptr<core::audio_buffer> empty_audio()\r
  67 {\r
  68         static std::shared_ptr<core::audio_buffer> audio(new core::audio_buffer());\r
  69         return audio;\r
  70 }\r
  71 \r
  72 std::shared_ptr<AVFrame>                        empty_video()\r
  73 {\r
  74         static std::shared_ptr<AVFrame> video(avcodec_alloc_frame(), av_free);\r
  75         return video;\r
  76 }\r
  77 \r
  78 core::field_mode get_mode(const AVFrame& frame)\r
  79 {\r
  80         if(!frame.interlaced_frame)\r
  81                 return core::field_mode::progressive;\r
  82 \r
  83         return frame.top_field_first ? core::field_mode::upper : core::field_mode::lower;\r
  84 }\r
  85 \r
  86 core::pixel_format get_pixel_format(PixelFormat pix_fmt)\r
  87 {\r
  88         switch(pix_fmt)\r
  89         {\r
  90         case PIX_FMT_GRAY8:                     return core::pixel_format::gray;\r
  91         case PIX_FMT_RGB24:                     return core::pixel_format::rgb;\r
  92         case PIX_FMT_BGR24:                     return core::pixel_format::bgr;\r
  93         case PIX_FMT_BGRA:                      return core::pixel_format::bgra;\r
  94         case PIX_FMT_ARGB:                      return core::pixel_format::argb;\r
  95         case PIX_FMT_RGBA:                      return core::pixel_format::rgba;\r
  96         case PIX_FMT_ABGR:                      return core::pixel_format::abgr;\r
  97         case PIX_FMT_YUV444P:           return core::pixel_format::ycbcr;\r
  98         case PIX_FMT_YUV422P:           return core::pixel_format::ycbcr;\r
  99         case PIX_FMT_YUV420P:           return core::pixel_format::ycbcr;\r
 100         case PIX_FMT_YUV411P:           return core::pixel_format::ycbcr;\r
 101         case PIX_FMT_YUV410P:           return core::pixel_format::ycbcr;\r
 102         case PIX_FMT_YUVA420P:          return core::pixel_format::ycbcra;\r
 103         default:                                        return core::pixel_format::invalid;\r
 104         }\r
 105 }\r
 106 \r
 107 core::pixel_format_desc pixel_format_desc(PixelFormat pix_fmt, int width, int height)\r
 108 {\r
 109         // Get linesizes\r
 110         AVPicture dummy_pict;   \r
 111         avpicture_fill(&dummy_pict, nullptr, pix_fmt, width, height);\r
 112 \r
 113         core::pixel_format_desc desc = get_pixel_format(pix_fmt);\r
 114                 \r
 115         switch(desc.format.value())\r
 116         {\r
 117         case core::pixel_format::gray:\r
 118         case core::pixel_format::luma:\r
 119                 {\r
 120                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));                                               \r
 121                         return desc;\r
 122                 }\r
 123         case core::pixel_format::bgr:\r
 124         case core::pixel_format::rgb:\r
 125                 {\r
 126                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0]/3, height, 3));                                             \r
 127                         return desc;\r
 128                 }\r
 129         case core::pixel_format::bgra:\r
 130         case core::pixel_format::argb:\r
 131         case core::pixel_format::rgba:\r
 132         case core::pixel_format::abgr:\r
 133                 {\r
 134                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0]/4, height, 4));                                             \r
 135                         return desc;\r
 136                 }\r
 137         case core::pixel_format::ycbcr:\r
 138         case core::pixel_format::ycbcra:\r
 139                 {               \r
 140                         // Find chroma height\r
 141                         int size2 = static_cast<int>(dummy_pict.data[2] - dummy_pict.data[1]);\r
 142                         int h2 = size2/dummy_pict.linesize[1];                  \r
 143 \r
 144                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));\r
 145                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[1], h2, 1));\r
 146                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[2], h2, 1));\r
 147 \r
 148                         if(desc.format == core::pixel_format::ycbcra)                                           \r
 149                                 desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[3], height, 1));       \r
 150                         return desc;\r
 151                 }               \r
 152         default:                \r
 153                 desc.format = core::pixel_format::invalid;\r
 154                 return desc;\r
 155         }\r
 156 }\r
 157 \r
 158 core::mutable_frame make_frame(const void* tag, const spl::shared_ptr<AVFrame>& decoded_frame, double fps, core::frame_factory& frame_factory)\r
 159 {                       \r
 160         static tbb::concurrent_unordered_map<int64_t, tbb::concurrent_queue<std::shared_ptr<SwsContext>>> sws_contvalid_exts_;\r
 161         \r
 162         if(decoded_frame->width < 1 || decoded_frame->height < 1)\r
 163                 return frame_factory.create_frame(tag, core::pixel_format_desc(core::pixel_format::invalid));\r
 164 \r
 165         const auto width  = decoded_frame->width;\r
 166         const auto height = decoded_frame->height;\r
 167         auto desc                 = pixel_format_desc(static_cast<PixelFormat>(decoded_frame->format), width, height);\r
 168                 \r
 169         if(desc.format == core::pixel_format::invalid)\r
 170         {\r
 171                 auto pix_fmt = static_cast<PixelFormat>(decoded_frame->format);\r
 172                 auto target_pix_fmt = PIX_FMT_BGRA;\r
 173 \r
 174                 if(pix_fmt == PIX_FMT_UYVY422)\r
 175                         target_pix_fmt = PIX_FMT_YUV422P;\r
 176                 else if(pix_fmt == PIX_FMT_YUYV422)\r
 177                         target_pix_fmt = PIX_FMT_YUV422P;\r
 178                 else if(pix_fmt == PIX_FMT_UYYVYY411)\r
 179                         target_pix_fmt = PIX_FMT_YUV411P;\r
 180                 else if(pix_fmt == PIX_FMT_YUV420P10)\r
 181                         target_pix_fmt = PIX_FMT_YUV420P;\r
 182                 else if(pix_fmt == PIX_FMT_YUV422P10)\r
 183                         target_pix_fmt = PIX_FMT_YUV422P;\r
 184                 else if(pix_fmt == PIX_FMT_YUV444P10)\r
 185                         target_pix_fmt = PIX_FMT_YUV444P;\r
 186                 \r
 187                 auto target_desc = pixel_format_desc(target_pix_fmt, width, height);\r
 188 \r
 189                 auto write = frame_factory.create_frame(tag, target_desc);\r
 190 \r
 191                 std::shared_ptr<SwsContext> sws_context;\r
 192 \r
 193                 //CASPAR_LOG(warning) << "Hardware accelerated color transform not supported.";\r
 194                 \r
 195                 int64_t key = ((static_cast<int64_t>(width)                      << 32) & 0xFFFF00000000) | \r
 196                                           ((static_cast<int64_t>(height)                 << 16) & 0xFFFF0000) | \r
 197                                           ((static_cast<int64_t>(pix_fmt)                <<  8) & 0xFF00) | \r
 198                                           ((static_cast<int64_t>(target_pix_fmt) <<  0) & 0xFF);\r
 199                         \r
 200                 auto& pool = sws_contvalid_exts_[key];\r
 201                                                 \r
 202                 if(!pool.try_pop(sws_context))\r
 203                 {\r
 204                         double param;\r
 205                         sws_context.reset(sws_getContext(width, height, pix_fmt, width, height, target_pix_fmt, SWS_BILINEAR, nullptr, nullptr, &param), sws_freeContext);\r
 206                 }\r
 207                         \r
 208                 if(!sws_context)\r
 209                 {\r
 210                         CASPAR_THROW_EXCEPTION(operation_failed() << msg_info("Could not create software scaling context.") << \r
 211                                                                         boost::errinfo_api_function("sws_getContext"));\r
 212                 }       \r
 213                 \r
 214                 spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);      \r
 215                 avcodec_get_frame_defaults(av_frame.get());                     \r
 216                 if(target_pix_fmt == PIX_FMT_BGRA)\r
 217                 {\r
 218                         auto size = avpicture_fill(reinterpret_cast<AVPicture*>(av_frame.get()), write.image_data(0).begin(), PIX_FMT_BGRA, width, height);\r
 219                         CASPAR_VERIFY(size == write.image_data(0).size()); \r
 220                 }\r
 221                 else\r
 222                 {\r
 223                         av_frame->width  = width;\r
 224                         av_frame->height = height;\r
 225                         for(int n = 0; n < target_desc.planes.size(); ++n)\r
 226                         {\r
 227                                 av_frame->data[n]               = write.image_data(n).begin();\r
 228                                 av_frame->linesize[n]   = target_desc.planes[n].linesize;\r
 229                         }\r
 230                 }\r
 231 \r
 232                 sws_scale(sws_context.get(), decoded_frame->data, decoded_frame->linesize, 0, height, av_frame->data, av_frame->linesize);      \r
 233                 pool.push(sws_context); \r
 234 \r
 235                 return std::move(write);\r
 236         }\r
 237         else\r
 238         {\r
 239                 auto write = frame_factory.create_frame(tag, desc);\r
 240                 \r
 241                 for(int n = 0; n < static_cast<int>(desc.planes.size()); ++n)\r
 242                 {\r
 243                         auto plane            = desc.planes[n];\r
 244                         auto result           = write.image_data(n).begin();\r
 245                         auto decoded          = decoded_frame->data[n];\r
 246                         auto decoded_linesize = decoded_frame->linesize[n];\r
 247                         \r
 248                         CASPAR_ASSERT(decoded);\r
 249                         CASPAR_ASSERT(write.image_data(n).begin());\r
 250 \r
 251                         // Copy line by line since ffmpeg sometimes pads each line.\r
 252                         tbb::affinity_partitioner ap;\r
 253                         tbb::parallel_for(tbb::blocked_range<int>(0, desc.planes[n].height), [&](const tbb::blocked_range<int>& r)\r
 254                         {\r
 255                                 for(int y = r.begin(); y != r.end(); ++y)\r
 256                                         A_memcpy(result + y*plane.linesize, decoded + y*decoded_linesize, plane.linesize);\r
 257                         }, ap);\r
 258                 }\r
 259         \r
 260                 return std::move(write);\r
 261         }\r
 262 }\r
 263 \r
 264 spl::shared_ptr<AVFrame> make_av_frame(core::mutable_frame& frame)\r
 265 {\r
 266         std::array<uint8_t*, 4> data = {};\r
 267         for(int n = 0; n < frame.pixel_format_desc().planes.size(); ++n)\r
 268                 data[n] = frame.image_data(n).begin();\r
 269 \r
 270         return make_av_frame(data, frame.pixel_format_desc());\r
 271 }\r
 272 \r
 273 spl::shared_ptr<AVFrame> make_av_frame(std::array<uint8_t*, 4> data, const core::pixel_format_desc& pix_desc)\r
 274 {\r
 275         spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);      \r
 276         avcodec_get_frame_defaults(av_frame.get());\r
 277         \r
 278         auto planes              = pix_desc.planes;\r
 279         auto format              = pix_desc.format.value();\r
 280 \r
 281         av_frame->width  = planes[0].width;\r
 282         av_frame->height = planes[0].height;\r
 283         for(int n = 0; n < planes.size(); ++n)  \r
 284         {\r
 285                 av_frame->data[n]         = data[n];\r
 286                 av_frame->linesize[n] = planes[n].linesize;     \r
 287         }\r
 288 \r
 289         switch(format)\r
 290         {\r
 291         case core::pixel_format::rgb:\r
 292                 av_frame->format = PIX_FMT_RGB24;\r
 293                 break;\r
 294         case core::pixel_format::bgr:\r
 295                 av_frame->format = PIX_FMT_BGR24;\r
 296                 break;\r
 297         case core::pixel_format::rgba:\r
 298                 av_frame->format = PIX_FMT_RGBA; \r
 299                 break;\r
 300         case core::pixel_format::argb:\r
 301                 av_frame->format = PIX_FMT_ARGB; \r
 302                 break;\r
 303         case core::pixel_format::bgra:\r
 304                 av_frame->format = PIX_FMT_BGRA; \r
 305                 break;\r
 306         case core::pixel_format::abgr:\r
 307                 av_frame->format = PIX_FMT_ABGR; \r
 308                 break;\r
 309         case core::pixel_format::gray:\r
 310                 av_frame->format = PIX_FMT_GRAY8; \r
 311                 break;\r
 312         case core::pixel_format::ycbcr:\r
 313         {\r
 314                 int y_w = planes[0].width;\r
 315                 int y_h = planes[0].height;\r
 316                 int c_w = planes[1].width;\r
 317                 int c_h = planes[1].height;\r
 318 \r
 319                 if(c_h == y_h && c_w == y_w)\r
 320                         av_frame->format = PIX_FMT_YUV444P;\r
 321                 else if(c_h == y_h && c_w*2 == y_w)\r
 322                         av_frame->format = PIX_FMT_YUV422P;\r
 323                 else if(c_h == y_h && c_w*4 == y_w)\r
 324                         av_frame->format = PIX_FMT_YUV411P;\r
 325                 else if(c_h*2 == y_h && c_w*2 == y_w)\r
 326                         av_frame->format = PIX_FMT_YUV420P;\r
 327                 else if(c_h*2 == y_h && c_w*4 == y_w)\r
 328                         av_frame->format = PIX_FMT_YUV410P;\r
 329 \r
 330                 break;\r
 331         }\r
 332         case core::pixel_format::ycbcra:\r
 333                 av_frame->format = PIX_FMT_YUVA420P;\r
 334                 break;\r
 335         }\r
 336         return av_frame;\r
 337 }\r
 338 \r
 339 bool is_sane_fps(AVRational time_base)\r
 340 {\r
 341         double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);\r
 342         return fps > 20.0 && fps < 65.0;\r
 343 }\r
 344 \r
 345 AVRational fix_time_base(AVRational time_base)\r
 346 {\r
 347         if(time_base.num == 1)\r
 348                 time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(time_base.den)))-1));    \r
 349                         \r
 350         if(!is_sane_fps(time_base))\r
 351         {\r
 352                 auto tmp = time_base;\r
 353                 tmp.den /= 2;\r
 354                 if(is_sane_fps(tmp))\r
 355                         time_base = tmp;\r
 356         }\r
 357 \r
 358         return time_base;\r
 359 }\r
 360 \r
 361 double read_fps(AVFormatContext& context, double fail_value)\r
 362 {                                               \r
 363         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 364         auto audio_index = av_find_best_stream(&context, AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0);\r
 365         \r
 366         if(video_index > -1)\r
 367         {\r
 368                 const auto video_context = context.streams[video_index]->codec;\r
 369                 const auto video_stream  = context.streams[video_index];\r
 370                                                 \r
 371                 AVRational time_base = video_context->time_base;\r
 372 \r
 373                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")\r
 374                 {\r
 375                         try\r
 376                         {\r
 377                                 auto meta = read_flv_meta_info(context.filename);\r
 378                                 return boost::lexical_cast<double>(meta["framerate"]);\r
 379                         }\r
 380                         catch(...)\r
 381                         {\r
 382                                 return 0.0;\r
 383                         }\r
 384                 }\r
 385                 else\r
 386                 {\r
 387                         time_base.num *= video_context->ticks_per_frame;\r
 388 \r
 389                         if(!is_sane_fps(time_base))\r
 390                         {                       \r
 391                                 time_base = fix_time_base(time_base);\r
 392 \r
 393                                 if(!is_sane_fps(time_base) && audio_index > -1)\r
 394                                 {\r
 395                                         auto& audio_context = *context.streams[audio_index]->codec;\r
 396                                         auto& audio_stream  = *context.streams[audio_index];\r
 397 \r
 398                                         double duration_sec = audio_stream.duration / static_cast<double>(audio_context.sample_rate);\r
 399                                                                 \r
 400                                         time_base.num = static_cast<int>(duration_sec*100000.0);\r
 401                                         time_base.den = static_cast<int>(video_stream->nb_frames*100000);\r
 402                                 }\r
 403                         }\r
 404                 }\r
 405                 \r
 406                 double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);\r
 407 \r
 408                 double closest_fps = 0.0;\r
 409                 for(int n = 0; n < core::video_format::count; ++n)\r
 410                 {\r
 411                         auto format = core::video_format_desc(core::video_format(n));\r
 412 \r
 413                         double diff1 = std::abs(format.fps - fps);\r
 414                         double diff2 = std::abs(closest_fps - fps);\r
 415 \r
 416                         if(diff1 < diff2)\r
 417                                 closest_fps = format.fps;\r
 418                 }\r
 419         \r
 420                 return closest_fps;\r
 421         }\r
 422 \r
 423         return fail_value;      \r
 424 }\r
 425 \r
 426 void fix_meta_data(AVFormatContext& context)\r
 427 {\r
 428         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 429 \r
 430         if(video_index > -1)\r
 431         {\r
 432                 auto video_stream   = context.streams[video_index];\r
 433                 auto video_context  = context.streams[video_index]->codec;\r
 434                                                 \r
 435                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")\r
 436                 {\r
 437                         try\r
 438                         {\r
 439                                 auto meta = read_flv_meta_info(context.filename);\r
 440                                 double fps = boost::lexical_cast<double>(meta["framerate"]);\r
 441                                 video_stream->nb_frames = static_cast<int64_t>(boost::lexical_cast<double>(meta["duration"])*fps);\r
 442                         }\r
 443                         catch(...){}\r
 444                 }\r
 445                 else\r
 446                 {\r
 447                         auto stream_time = video_stream->time_base;\r
 448                         auto duration    = video_stream->duration;\r
 449                         auto codec_time  = video_context->time_base;\r
 450                         auto ticks               = video_context->ticks_per_frame;\r
 451 \r
 452                         if(video_stream->nb_frames == 0)\r
 453                                 video_stream->nb_frames = (duration*stream_time.num*codec_time.den)/(stream_time.den*codec_time.num*ticks);     \r
 454                 }\r
 455         }\r
 456 }\r
 457 \r
 458 spl::shared_ptr<AVPacket> create_packet()\r
 459 {\r
 460         spl::shared_ptr<AVPacket> packet(new AVPacket, [](AVPacket* p)\r
 461         {\r
 462                 av_free_packet(p);\r
 463                 delete p;\r
 464         });\r
 465         \r
 466         av_init_packet(packet.get());\r
 467         return packet;\r
 468 }\r
 469 \r
 470 spl::shared_ptr<AVCodecContext> open_codec(AVFormatContext& context, enum AVMediaType type, int& index)\r
 471 {       \r
 472         AVCodec* decoder;\r
 473         index = THROW_ON_ERROR2(av_find_best_stream(&context, type, -1, -1, &decoder, 0), "");\r
 474         //if(strcmp(decoder->name, "prores") == 0 && decoder->next && strcmp(decoder->next->name, "prores_lgpl") == 0)\r
 475         //      decoder = decoder->next;\r
 476 \r
 477         THROW_ON_ERROR2(tbb_avcodec_open(context.streams[index]->codec, decoder), "");\r
 478         return spl::shared_ptr<AVCodecContext>(context.streams[index]->codec, tbb_avcodec_close);\r
 479 }\r
 480 \r
 481 spl::shared_ptr<AVFormatContext> open_input(const std::wstring& filename)\r
 482 {\r
 483         AVFormatContext* weak_context = nullptr;\r
 484         THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(filename).c_str(), nullptr, nullptr), filename);\r
 485         spl::shared_ptr<AVFormatContext> context(weak_context, av_close_input_file);                    \r
 486         THROW_ON_ERROR2(avformat_find_stream_info(weak_context, nullptr), filename);\r
 487         fix_meta_data(*context);\r
 488         return context;\r
 489 }\r
 490 \r
 491 std::wstring print_mode(int width, int height, double fps, bool interlaced)\r
 492 {\r
 493         std::wostringstream fps_ss;\r
 494         fps_ss << std::fixed << std::setprecision(2) << (!interlaced ? fps : 2.0 * fps);\r
 495 \r
 496         return boost::lexical_cast<std::wstring>(width) + L"x" + boost::lexical_cast<std::wstring>(height) + (!interlaced ? L"p" : L"i") + fps_ss.str();\r
 497 }\r
 498 \r
 499 bool is_valid_file(const std::wstring filename)\r
 500 {                               \r
 501         static const std::vector<std::wstring> invalid_exts = boost::assign::list_of(L".png")(L".tga")(L".bmp")(L".jpg")(L".jpeg")(L".gif")(L".tiff")(L".tif")(L".jp2")(L".jpx")(L".j2k")(L".j2c");\r
 502         static std::vector<std::wstring>           valid_exts   = boost::assign::list_of(L".m2t")(L".mov")(L".mp4")(L".dv")(L".flv")(L".mpg")(L".wav")(L".mp3")(L".dnxhd")(L".h264")(L".prores");\r
 503 \r
 504         auto ext = boost::to_lower_copy(boost::filesystem::path(filename).extension().wstring());\r
 505                 \r
 506         if(std::find(valid_exts.begin(), valid_exts.end(), ext) != valid_exts.end())\r
 507                 return true;    \r
 508         \r
 509         if(std::find(invalid_exts.begin(), invalid_exts.end(), ext) != invalid_exts.end())\r
 510                 return false;   \r
 511 \r
 512         auto u8filename = u8(filename);\r
 513         \r
 514         int score = 0;\r
 515         AVProbeData pb = {};\r
 516         pb.filename = u8filename.c_str();\r
 517 \r
 518         if(av_probe_input_format2(&pb, false, &score) != nullptr)\r
 519                 return true;\r
 520 \r
 521         std::ifstream file(filename);\r
 522 \r
 523         std::vector<unsigned char> buf;\r
 524         for(auto file_it = std::istreambuf_iterator<char>(file); file_it != std::istreambuf_iterator<char>() && buf.size() < 1024; ++file_it)\r
 525                 buf.push_back(*file_it);\r
 526 \r
 527         if(buf.empty())\r
 528                 return nullptr;\r
 529 \r
 530         pb.buf          = buf.data();\r
 531         pb.buf_size = static_cast<int>(buf.size());\r
 532 \r
 533         return av_probe_input_format2(&pb, true, &score) != nullptr;\r
 534 }\r
 535 \r
 536 std::wstring probe_stem(const std::wstring stem)\r
 537 {\r
 538         auto stem2 = boost::filesystem::path(stem);\r
 539         auto dir = stem2.parent_path();\r
 540         for(auto it = boost::filesystem::directory_iterator(dir); it != boost::filesystem::directory_iterator(); ++it)\r
 541         {\r
 542                 if(boost::iequals(it->path().stem().wstring(), stem2.filename().wstring()) && is_valid_file(it->path().wstring()))\r
 543                         return it->path().wstring();\r
 544         }\r
 545         return L"";\r
 546 }\r
 547 //\r
 548 //void av_dup_frame(AVFrame* frame)\r
 549 //{\r
 550 //      AVFrame* new_frame = avcodec_alloc_frame();\r
 551 //\r
 552 //\r
 553 //      const uint8_t *src_data[4] = {0};\r
 554 //      memcpy(const_cast<uint8_t**>(&src_data[0]), frame->data, 4);\r
 555 //      const int src_linesizes[4] = {0};\r
 556 //      memcpy(const_cast<int*>(&src_linesizes[0]), frame->linesize, 4);\r
 557 //\r
 558 //      av_image_alloc(new_frame->data, new_frame->linesize, new_frame->width, new_frame->height, frame->format, 16);\r
 559 //\r
 560 //      av_image_copy(new_frame->data, new_frame->linesize, src_data, src_linesizes, frame->format, new_frame->width, new_frame->height);\r
 561 //\r
 562 //      frame =\r
 563 //}\r
 564 \r
 565 }}