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> flush_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<core::audio_buffer> empty_audio()\r
  73 {\r
  74         static std::shared_ptr<core::audio_buffer> audio(new core::audio_buffer());\r
  75         return audio;\r
  76 }\r
  77 \r
  78 std::shared_ptr<AVFrame>                        flush_video()\r
  79 {\r
  80         static std::shared_ptr<AVFrame> video(avcodec_alloc_frame(), av_free);\r
  81         return video;\r
  82 }\r
  83 \r
  84 std::shared_ptr<AVFrame>                        empty_video()\r
  85 {\r
  86         static std::shared_ptr<AVFrame> video(avcodec_alloc_frame(), av_free);\r
  87         return video;\r
  88 }\r
  89 \r
  90 spl::shared_ptr<AVPacket> flush_packet()\r
  91 {\r
  92         static spl::shared_ptr<AVPacket> pkt(new AVPacket());\r
  93         return pkt;\r
  94 }\r
  95 \r
  96 spl::shared_ptr<AVPacket> null_packet()\r
  97 {\r
  98         static spl::shared_ptr<AVPacket> pkt(new AVPacket());\r
  99         return pkt;\r
 100 }\r
 101 \r
 102 \r
 103 core::field_mode get_mode(const AVFrame& frame)\r
 104 {\r
 105         if(!frame.interlaced_frame)\r
 106                 return core::field_mode::progressive;\r
 107 \r
 108         return frame.top_field_first ? core::field_mode::upper : core::field_mode::lower;\r
 109 }\r
 110 \r
 111 core::pixel_format get_pixel_format(PixelFormat pix_fmt)\r
 112 {\r
 113         switch(pix_fmt)\r
 114         {\r
 115         case PIX_FMT_GRAY8:                     return core::pixel_format::gray;\r
 116         case PIX_FMT_BGRA:                      return core::pixel_format::bgra;\r
 117         case PIX_FMT_ARGB:                      return core::pixel_format::argb;\r
 118         case PIX_FMT_RGBA:                      return core::pixel_format::rgba;\r
 119         case PIX_FMT_ABGR:                      return core::pixel_format::abgr;\r
 120         case PIX_FMT_YUV444P:           return core::pixel_format::ycbcr;\r
 121         case PIX_FMT_YUV422P:           return core::pixel_format::ycbcr;\r
 122         case PIX_FMT_YUV420P:           return core::pixel_format::ycbcr;\r
 123         case PIX_FMT_YUV411P:           return core::pixel_format::ycbcr;\r
 124         case PIX_FMT_YUV410P:           return core::pixel_format::ycbcr;\r
 125         case PIX_FMT_YUVA420P:          return core::pixel_format::ycbcra;\r
 126         default:                                        return core::pixel_format::invalid;\r
 127         }\r
 128 }\r
 129 \r
 130 core::pixel_format_desc pixel_format_desc(PixelFormat pix_fmt, int width, int height)\r
 131 {\r
 132         // Get linesizes\r
 133         AVPicture dummy_pict;   \r
 134         avpicture_fill(&dummy_pict, nullptr, pix_fmt, width, height);\r
 135 \r
 136         core::pixel_format_desc desc = get_pixel_format(pix_fmt);\r
 137                 \r
 138         switch(desc.format.value())\r
 139         {\r
 140         case core::pixel_format::gray:\r
 141         case core::pixel_format::luma:\r
 142                 {\r
 143                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));                                               \r
 144                         return desc;\r
 145                 }\r
 146         case core::pixel_format::bgra:\r
 147         case core::pixel_format::argb:\r
 148         case core::pixel_format::rgba:\r
 149         case core::pixel_format::abgr:\r
 150                 {\r
 151                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0]/4, height, 4));                                             \r
 152                         return desc;\r
 153                 }\r
 154         case core::pixel_format::ycbcr:\r
 155         case core::pixel_format::ycbcra:\r
 156                 {               \r
 157                         // Find chroma height\r
 158                         int size2 = static_cast<int>(dummy_pict.data[2] - dummy_pict.data[1]);\r
 159                         int h2 = size2/dummy_pict.linesize[1];                  \r
 160 \r
 161                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));\r
 162                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[1], h2, 1));\r
 163                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[2], h2, 1));\r
 164 \r
 165                         if(desc.format == core::pixel_format::ycbcra)                                           \r
 166                                 desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[3], height, 1));       \r
 167                         return desc;\r
 168                 }               \r
 169         default:                \r
 170                 desc.format = core::pixel_format::invalid;\r
 171                 return desc;\r
 172         }\r
 173 }\r
 174 \r
 175 core::mutable_frame make_frame(const void* tag, const spl::shared_ptr<AVFrame>& decoded_frame, double fps, core::frame_factory& frame_factory)\r
 176 {                       \r
 177         static tbb::concurrent_unordered_map<int, tbb::concurrent_queue<std::shared_ptr<SwsContext>>> sws_contexts_;\r
 178         \r
 179         if(decoded_frame->width < 1 || decoded_frame->height < 1)\r
 180                 return frame_factory.create_frame(tag, core::pixel_format_desc(core::pixel_format::invalid));\r
 181 \r
 182         const auto width  = decoded_frame->width;\r
 183         const auto height = decoded_frame->height;\r
 184         auto desc                 = pixel_format_desc(static_cast<PixelFormat>(decoded_frame->format), width, height);\r
 185                 \r
 186         if(desc.format == core::pixel_format::invalid)\r
 187         {\r
 188                 auto pix_fmt = static_cast<PixelFormat>(decoded_frame->format);\r
 189                 auto target_pix_fmt = PIX_FMT_BGRA;\r
 190 \r
 191                 if(pix_fmt == PIX_FMT_UYVY422)\r
 192                         target_pix_fmt = PIX_FMT_YUV422P;\r
 193                 else if(pix_fmt == PIX_FMT_YUYV422)\r
 194                         target_pix_fmt = PIX_FMT_YUV422P;\r
 195                 else if(pix_fmt == PIX_FMT_UYYVYY411)\r
 196                         target_pix_fmt = PIX_FMT_YUV411P;\r
 197                 else if(pix_fmt == PIX_FMT_YUV420P10)\r
 198                         target_pix_fmt = PIX_FMT_YUV420P;\r
 199                 else if(pix_fmt == PIX_FMT_YUV422P10)\r
 200                         target_pix_fmt = PIX_FMT_YUV422P;\r
 201                 else if(pix_fmt == PIX_FMT_YUV444P10)\r
 202                         target_pix_fmt = PIX_FMT_YUV444P;\r
 203                 \r
 204                 auto target_desc = pixel_format_desc(target_pix_fmt, width, height);\r
 205 \r
 206                 auto write = frame_factory.create_frame(tag, target_desc, fps, get_mode(*decoded_frame));\r
 207 \r
 208                 std::shared_ptr<SwsContext> sws_context;\r
 209 \r
 210                 //CASPAR_LOG(warning) << "Hardware accelerated color transform not supported.";\r
 211 \r
 212                 int key = ((width << 22) & 0xFFC00000) | ((height << 6) & 0x003FC000) | ((pix_fmt << 7) & 0x00007F00) | ((target_pix_fmt << 0) & 0x0000007F);\r
 213                         \r
 214                 auto& pool = sws_contexts_[key];\r
 215                                                 \r
 216                 if(!pool.try_pop(sws_context))\r
 217                 {\r
 218                         double param;\r
 219                         sws_context.reset(sws_getContext(width, height, pix_fmt, width, height, target_pix_fmt, SWS_BILINEAR, nullptr, nullptr, &param), sws_freeContext);\r
 220                 }\r
 221                         \r
 222                 if(!sws_context)\r
 223                 {\r
 224                         BOOST_THROW_EXCEPTION(operation_failed() << msg_info("Could not create software scaling context.") << \r
 225                                                                         boost::errinfo_api_function("sws_getContext"));\r
 226                 }       \r
 227                 \r
 228                 spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);      \r
 229                 avcodec_get_frame_defaults(av_frame.get());                     \r
 230                 if(target_pix_fmt == PIX_FMT_BGRA)\r
 231                 {\r
 232                         auto size = avpicture_fill(reinterpret_cast<AVPicture*>(av_frame.get()), write.image_data(0).begin(), PIX_FMT_BGRA, width, height);\r
 233                         CASPAR_VERIFY(size == write.image_data(0).size()); \r
 234                 }\r
 235                 else\r
 236                 {\r
 237                         av_frame->width  = width;\r
 238                         av_frame->height = height;\r
 239                         for(int n = 0; n < target_desc.planes.size(); ++n)\r
 240                         {\r
 241                                 av_frame->data[n]               = write.image_data(n).begin();\r
 242                                 av_frame->linesize[n]   = target_desc.planes[n].linesize;\r
 243                         }\r
 244                 }\r
 245 \r
 246                 sws_scale(sws_context.get(), decoded_frame->data, decoded_frame->linesize, 0, height, av_frame->data, av_frame->linesize);      \r
 247                 pool.push(sws_context); \r
 248 \r
 249                 return std::move(write);\r
 250         }\r
 251         else\r
 252         {\r
 253                 auto write = frame_factory.create_frame(tag, desc, fps, get_mode(*decoded_frame));\r
 254                 \r
 255                 for(int n = 0; n < static_cast<int>(desc.planes.size()); ++n)\r
 256                 {\r
 257                         auto plane            = desc.planes[n];\r
 258                         auto result           = write.image_data(n).begin();\r
 259                         auto decoded          = decoded_frame->data[n];\r
 260                         auto decoded_linesize = decoded_frame->linesize[n];\r
 261                         \r
 262                         CASPAR_ASSERT(decoded);\r
 263                         CASPAR_ASSERT(write.image_data(n).begin());\r
 264 \r
 265                         // Copy line by line since ffmpeg sometimes pads each line.\r
 266                         tbb::affinity_partitioner ap;\r
 267                         tbb::parallel_for(tbb::blocked_range<int>(0, desc.planes[n].height), [&](const tbb::blocked_range<int>& r)\r
 268                         {\r
 269                                 for(int y = r.begin(); y != r.end(); ++y)\r
 270                                         A_memcpy(result + y*plane.linesize, decoded + y*decoded_linesize, plane.linesize);\r
 271                         }, ap);\r
 272                 }\r
 273         \r
 274                 return std::move(write);\r
 275         }\r
 276 }\r
 277 \r
 278 spl::shared_ptr<AVFrame> make_av_frame(core::mutable_frame& frame)\r
 279 {\r
 280         std::array<uint8_t*, 4> data = {};\r
 281         for(int n = 0; n < frame.pixel_format_desc().planes.size(); ++n)\r
 282                 data[n] = frame.image_data(n).begin();\r
 283 \r
 284         return make_av_frame(data, frame.pixel_format_desc());\r
 285 }\r
 286 \r
 287 spl::shared_ptr<AVFrame> make_av_frame(std::array<uint8_t*, 4> data, const core::pixel_format_desc& pix_desc)\r
 288 {\r
 289         spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);      \r
 290         avcodec_get_frame_defaults(av_frame.get());\r
 291         \r
 292         auto planes              = pix_desc.planes;\r
 293         auto format              = pix_desc.format.value();\r
 294 \r
 295         av_frame->width  = planes[0].width;\r
 296         av_frame->height = planes[0].height;\r
 297         for(int n = 0; n < planes.size(); ++n)  \r
 298         {\r
 299                 av_frame->data[n]         = data[n];\r
 300                 av_frame->linesize[n] = planes[n].linesize;     \r
 301         }\r
 302         switch(format)\r
 303         {\r
 304         case core::pixel_format::rgba:\r
 305                 av_frame->format = PIX_FMT_RGBA; \r
 306                 break;\r
 307         case core::pixel_format::argb:\r
 308                 av_frame->format = PIX_FMT_ARGB; \r
 309                 break;\r
 310         case core::pixel_format::bgra:\r
 311                 av_frame->format = PIX_FMT_BGRA; \r
 312                 break;\r
 313         case core::pixel_format::abgr:\r
 314                 av_frame->format = PIX_FMT_ABGR; \r
 315                 break;\r
 316         case core::pixel_format::gray:\r
 317                 av_frame->format = PIX_FMT_GRAY8; \r
 318                 break;\r
 319         case core::pixel_format::ycbcr:\r
 320         {\r
 321                 int y_w = planes[0].width;\r
 322                 int y_h = planes[0].height;\r
 323                 int c_w = planes[1].width;\r
 324                 int c_h = planes[1].height;\r
 325 \r
 326                 if(c_h == y_h && c_w == y_w)\r
 327                         av_frame->format = PIX_FMT_YUV444P;\r
 328                 else if(c_h == y_h && c_w*2 == y_w)\r
 329                         av_frame->format = PIX_FMT_YUV422P;\r
 330                 else if(c_h == y_h && c_w*4 == y_w)\r
 331                         av_frame->format = PIX_FMT_YUV411P;\r
 332                 else if(c_h*2 == y_h && c_w*2 == y_w)\r
 333                         av_frame->format = PIX_FMT_YUV420P;\r
 334                 else if(c_h*2 == y_h && c_w*4 == y_w)\r
 335                         av_frame->format = PIX_FMT_YUV410P;\r
 336 \r
 337                 break;\r
 338         }\r
 339         case core::pixel_format::ycbcra:\r
 340                 av_frame->format = PIX_FMT_YUVA420P;\r
 341                 break;\r
 342         }\r
 343         return av_frame;\r
 344 }\r
 345 \r
 346 bool is_sane_fps(AVRational time_base)\r
 347 {\r
 348         double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);\r
 349         return fps > 20.0 && fps < 65.0;\r
 350 }\r
 351 \r
 352 AVRational fix_time_base(AVRational time_base)\r
 353 {\r
 354         if(time_base.num == 1)\r
 355                 time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(time_base.den)))-1));    \r
 356                         \r
 357         if(!is_sane_fps(time_base))\r
 358         {\r
 359                 auto tmp = time_base;\r
 360                 tmp.den /= 2;\r
 361                 if(is_sane_fps(tmp))\r
 362                         time_base = tmp;\r
 363         }\r
 364 \r
 365         return time_base;\r
 366 }\r
 367 \r
 368 double read_fps(AVFormatContext& context, double fail_value)\r
 369 {                                               \r
 370         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 371         auto audio_index = av_find_best_stream(&context, AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0);\r
 372         \r
 373         if(video_index > -1)\r
 374         {\r
 375                 const auto video_context = context.streams[video_index]->codec;\r
 376                 const auto video_stream  = context.streams[video_index];\r
 377                                                 \r
 378                 AVRational time_base = video_context->time_base;\r
 379 \r
 380                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")\r
 381                 {\r
 382                         try\r
 383                         {\r
 384                                 auto meta = read_flv_meta_info(context.filename);\r
 385                                 return boost::lexical_cast<double>(meta["framerate"]);\r
 386                         }\r
 387                         catch(...)\r
 388                         {\r
 389                                 return 0.0;\r
 390                         }\r
 391                 }\r
 392                 else\r
 393                 {\r
 394                         time_base.num *= video_context->ticks_per_frame;\r
 395 \r
 396                         if(!is_sane_fps(time_base))\r
 397                         {                       \r
 398                                 time_base = fix_time_base(time_base);\r
 399 \r
 400                                 if(!is_sane_fps(time_base) && audio_index > -1)\r
 401                                 {\r
 402                                         auto& audio_context = *context.streams[audio_index]->codec;\r
 403                                         auto& audio_stream  = *context.streams[audio_index];\r
 404 \r
 405                                         double duration_sec = audio_stream.duration / static_cast<double>(audio_context.sample_rate);\r
 406                                                                 \r
 407                                         time_base.num = static_cast<int>(duration_sec*100000.0);\r
 408                                         time_base.den = static_cast<int>(video_stream->nb_frames*100000);\r
 409                                 }\r
 410                         }\r
 411                 }\r
 412                 \r
 413                 double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);\r
 414 \r
 415                 double closest_fps = 0.0;\r
 416                 for(int n = 0; n < core::video_format::count; ++n)\r
 417                 {\r
 418                         auto format = core::video_format_desc(core::video_format(n));\r
 419 \r
 420                         double diff1 = std::abs(format.fps - fps);\r
 421                         double diff2 = std::abs(closest_fps - fps);\r
 422 \r
 423                         if(diff1 < diff2)\r
 424                                 closest_fps = format.fps;\r
 425                 }\r
 426         \r
 427                 return closest_fps;\r
 428         }\r
 429 \r
 430         return fail_value;      \r
 431 }\r
 432 \r
 433 void fix_meta_data(AVFormatContext& context)\r
 434 {\r
 435         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 436 \r
 437         if(video_index > -1)\r
 438         {\r
 439                 auto video_stream   = context.streams[video_index];\r
 440                 auto video_context  = context.streams[video_index]->codec;\r
 441                                                 \r
 442                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")\r
 443                 {\r
 444                         try\r
 445                         {\r
 446                                 auto meta = read_flv_meta_info(context.filename);\r
 447                                 double fps = boost::lexical_cast<double>(meta["framerate"]);\r
 448                                 video_stream->nb_frames = static_cast<int64_t>(boost::lexical_cast<double>(meta["duration"])*fps);\r
 449                         }\r
 450                         catch(...){}\r
 451                 }\r
 452                 else\r
 453                 {\r
 454                         auto stream_time = video_stream->time_base;\r
 455                         auto duration    = video_stream->duration;\r
 456                         auto codec_time  = video_context->time_base;\r
 457                         auto ticks               = video_context->ticks_per_frame;\r
 458 \r
 459                         if(video_stream->nb_frames == 0)\r
 460                                 video_stream->nb_frames = (duration*stream_time.num*codec_time.den)/(stream_time.den*codec_time.num*ticks);     \r
 461                 }\r
 462         }\r
 463 }\r
 464 \r
 465 spl::shared_ptr<AVPacket> create_packet()\r
 466 {\r
 467         spl::shared_ptr<AVPacket> packet(new AVPacket, [](AVPacket* p)\r
 468         {\r
 469                 av_free_packet(p);\r
 470                 delete p;\r
 471         });\r
 472         \r
 473         av_init_packet(packet.get());\r
 474         return packet;\r
 475 }\r
 476 \r
 477 spl::shared_ptr<AVCodecContext> open_codec(AVFormatContext& context, enum AVMediaType type, int& index)\r
 478 {       \r
 479         AVCodec* decoder;\r
 480         index = THROW_ON_ERROR2(av_find_best_stream(&context, type, -1, -1, &decoder, 0), "");\r
 481         //if(strcmp(decoder->name, "prores") == 0 && decoder->next && strcmp(decoder->next->name, "prores_lgpl") == 0)\r
 482         //      decoder = decoder->next;\r
 483 \r
 484         THROW_ON_ERROR2(tbb_avcodec_open(context.streams[index]->codec, decoder), "");\r
 485         return spl::shared_ptr<AVCodecContext>(context.streams[index]->codec, tbb_avcodec_close);\r
 486 }\r
 487 \r
 488 spl::shared_ptr<AVFormatContext> open_input(const std::wstring& filename)\r
 489 {\r
 490         AVFormatContext* weak_context = nullptr;\r
 491         THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(filename).c_str(), nullptr, nullptr), filename);\r
 492         spl::shared_ptr<AVFormatContext> context(weak_context, av_close_input_file);                    \r
 493         THROW_ON_ERROR2(avformat_find_stream_info(weak_context, nullptr), filename);\r
 494         fix_meta_data(*context);\r
 495         return context;\r
 496 }\r
 497 \r
 498 std::wstring print_mode(int width, int height, double fps, bool interlaced)\r
 499 {\r
 500         std::wostringstream fps_ss;\r
 501         fps_ss << std::fixed << std::setprecision(2) << (!interlaced ? fps : 2.0 * fps);\r
 502 \r
 503         return boost::lexical_cast<std::wstring>(width) + L"x" + boost::lexical_cast<std::wstring>(height) + (!interlaced ? L"p" : L"i") + fps_ss.str();\r
 504 }\r
 505 \r
 506 bool is_valid_file(const std::wstring filename)\r
 507 {                               \r
 508         static std::vector<std::wstring> 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
 509 \r
 510         auto ext = boost::to_lower_copy(boost::filesystem::path(filename).extension().wstring());\r
 511                 \r
 512         if(std::find(exts.begin(), exts.end(), ext) != exts.end())\r
 513                 return true;    \r
 514         \r
 515         auto u8filename = u8(filename);\r
 516         \r
 517         int score = 0;\r
 518         AVProbeData pb = {};\r
 519         pb.filename = u8filename.c_str();\r
 520 \r
 521         if(av_probe_input_format2(&pb, false, &score) != nullptr)\r
 522                 return true;\r
 523 \r
 524         std::ifstream file(filename);\r
 525 \r
 526         std::vector<unsigned char> buf;\r
 527         for(auto file_it = std::istreambuf_iterator<char>(file); file_it != std::istreambuf_iterator<char>() && buf.size() < 1024; ++file_it)\r
 528                 buf.push_back(*file_it);\r
 529 \r
 530         if(buf.empty())\r
 531                 return nullptr;\r
 532 \r
 533         pb.buf          = buf.data();\r
 534         pb.buf_size = static_cast<int>(buf.size());\r
 535 \r
 536         return av_probe_input_format2(&pb, true, &score) != nullptr;\r
 537 }\r
 538 \r
 539 std::wstring probe_stem(const std::wstring stem)\r
 540 {\r
 541         auto stem2 = boost::filesystem::path(stem);\r
 542         auto dir = stem2.parent_path();\r
 543         for(auto it = boost::filesystem::directory_iterator(dir); it != boost::filesystem::directory_iterator(); ++it)\r
 544         {\r
 545                 if(boost::iequals(it->path().stem().wstring(), stem2.filename().wstring()) && is_valid_file(it->path().wstring()))\r
 546                         return it->path().wstring();\r
 547         }\r
 548         return L"";\r
 549 }\r
 550 //\r
 551 //void av_dup_frame(AVFrame* frame)\r
 552 //{\r
 553 //      AVFrame* new_frame = avcodec_alloc_frame();\r
 554 //\r
 555 //\r
 556 //      const uint8_t *src_data[4] = {0};\r
 557 //      memcpy(const_cast<uint8_t**>(&src_data[0]), frame->data, 4);\r
 558 //      const int src_linesizes[4] = {0};\r
 559 //      memcpy(const_cast<int*>(&src_linesizes[0]), frame->linesize, 4);\r
 560 //\r
 561 //      av_image_alloc(new_frame->data, new_frame->linesize, new_frame->width, new_frame->height, frame->format, 16);\r
 562 //\r
 563 //      av_image_copy(new_frame->data, new_frame->linesize, src_data, src_linesizes, frame->format, new_frame->width, new_frame->height);\r
 564 //\r
 565 //      frame =\r
 566 //}\r
 567 \r
 568 }}