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

   1 /*
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   6 * CasparCG is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation, either version 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * CasparCG is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * Author: Robert Nagy, ronag89@gmail.com
  20 */
  21
  22 #include "../../StdAfx.h"
  23
  24 #include "util.h"
  25
  26 #include "flv.h"
  27
  28 #include "../tbb_avcodec.h"
  29 #include "../../ffmpeg_error.h"
  30
  31 #include <tbb/concurrent_unordered_map.h>
  32 #include <tbb/concurrent_queue.h>
  33
  34 #include <core/frame/frame_transform.h>
  35 #include <core/frame/frame_factory.h>
  36 #include <core/frame/frame.h>
  37 #include <core/producer/frame_producer.h>
  38
  39 #include <common/except.h>
  40 #include <common/array.h>
  41 #include <common/os/filesystem.h>
  42
  43 #include <tbb/parallel_for.h>
  44
  45 #include <common/assert.h>
  46 #include <boost/filesystem.hpp>
  47 #include <boost/lexical_cast.hpp>
  48 #include <boost/rational.hpp>
  49
  50 #include <fstream>
  51
  52 #include <asmlib.h>
  53
  54 #if defined(_MSC_VER)
  55 #pragma warning (push)
  56 #pragma warning (disable : 4244)
  57 #endif
  58 extern "C"
  59 {
  60         #include <libswscale/swscale.h>
  61         #include <libavcodec/avcodec.h>
  62         #include <libavformat/avformat.h>
  63 }
  64 #if defined(_MSC_VER)
  65 #pragma warning (pop)
  66 #endif
  67
  68 namespace caspar { namespace ffmpeg {
  69
  70 core::field_mode get_mode(const AVFrame& frame)
  71 {
  72         if(!frame.interlaced_frame)
  73                 return core::field_mode::progressive;
  74
  75         return frame.top_field_first ? core::field_mode::upper : core::field_mode::lower;
  76 }
  77
  78 core::pixel_format get_pixel_format(PixelFormat pix_fmt)
  79 {
  80         switch(pix_fmt)
  81         {
  82         case PIX_FMT_GRAY8:                     return core::pixel_format::gray;
  83         case PIX_FMT_RGB24:                     return core::pixel_format::rgb;
  84         case PIX_FMT_BGR24:                     return core::pixel_format::bgr;
  85         case PIX_FMT_BGRA:                      return core::pixel_format::bgra;
  86         case PIX_FMT_ARGB:                      return core::pixel_format::argb;
  87         case PIX_FMT_RGBA:                      return core::pixel_format::rgba;
  88         case PIX_FMT_ABGR:                      return core::pixel_format::abgr;
  89         case PIX_FMT_YUV444P:           return core::pixel_format::ycbcr;
  90         case PIX_FMT_YUV422P:           return core::pixel_format::ycbcr;
  91         case PIX_FMT_YUV420P:           return core::pixel_format::ycbcr;
  92         case PIX_FMT_YUV411P:           return core::pixel_format::ycbcr;
  93         case PIX_FMT_YUV410P:           return core::pixel_format::ycbcr;
  94         case PIX_FMT_YUVA420P:          return core::pixel_format::ycbcra;
  95         default:                                        return core::pixel_format::invalid;
  96         }
  97 }
  98
  99 core::pixel_format_desc pixel_format_desc(PixelFormat pix_fmt, int width, int height)
 100 {
 101         // Get linesizes
 102         AVPicture dummy_pict;
 103         avpicture_fill(&dummy_pict, nullptr, pix_fmt, width, height);
 104
 105         core::pixel_format_desc desc = get_pixel_format(pix_fmt);
 106
 107         switch(desc.format)
 108         {
 109         case core::pixel_format::gray:
 110         case core::pixel_format::luma:
 111                 {
 112                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));
 113                         return desc;
 114                 }
 115         case core::pixel_format::bgr:
 116         case core::pixel_format::rgb:
 117                 {
 118                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0]/3, height, 3));
 119                         return desc;
 120                 }
 121         case core::pixel_format::bgra:
 122         case core::pixel_format::argb:
 123         case core::pixel_format::rgba:
 124         case core::pixel_format::abgr:
 125                 {
 126                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0]/4, height, 4));
 127                         return desc;
 128                 }
 129         case core::pixel_format::ycbcr:
 130         case core::pixel_format::ycbcra:
 131                 {
 132                         // Find chroma height
 133                         int size2 = static_cast<int>(dummy_pict.data[2] - dummy_pict.data[1]);
 134                         int h2 = size2/dummy_pict.linesize[1];
 135
 136                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));
 137                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[1], h2, 1));
 138                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[2], h2, 1));
 139
 140                         if(desc.format == core::pixel_format::ycbcra)
 141                                 desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[3], height, 1));
 142                         return desc;
 143                 }
 144         default:
 145                 desc.format = core::pixel_format::invalid;
 146                 return desc;
 147         }
 148 }
 149
 150 core::mutable_frame make_frame(const void* tag, const spl::shared_ptr<AVFrame>& decoded_frame, double fps, core::frame_factory& frame_factory)
 151 {
 152         static tbb::concurrent_unordered_map<int64_t, tbb::concurrent_queue<std::shared_ptr<SwsContext>>> sws_contvalid_exts_;
 153
 154         if(decoded_frame->width < 1 || decoded_frame->height < 1)
 155                 return frame_factory.create_frame(tag, core::pixel_format_desc(core::pixel_format::invalid));
 156
 157         const auto width  = decoded_frame->width;
 158         const auto height = decoded_frame->height;
 159         auto desc                 = pixel_format_desc(static_cast<PixelFormat>(decoded_frame->format), width, height);
 160
 161         if(desc.format == core::pixel_format::invalid)
 162         {
 163                 auto pix_fmt = static_cast<PixelFormat>(decoded_frame->format);
 164                 auto target_pix_fmt = PIX_FMT_BGRA;
 165
 166                 if(pix_fmt == PIX_FMT_UYVY422)
 167                         target_pix_fmt = PIX_FMT_YUV422P;
 168                 else if(pix_fmt == PIX_FMT_YUYV422)
 169                         target_pix_fmt = PIX_FMT_YUV422P;
 170                 else if(pix_fmt == PIX_FMT_UYYVYY411)
 171                         target_pix_fmt = PIX_FMT_YUV411P;
 172                 else if(pix_fmt == PIX_FMT_YUV420P10)
 173                         target_pix_fmt = PIX_FMT_YUV420P;
 174                 else if(pix_fmt == PIX_FMT_YUV422P10)
 175                         target_pix_fmt = PIX_FMT_YUV422P;
 176                 else if(pix_fmt == PIX_FMT_YUV444P10)
 177                         target_pix_fmt = PIX_FMT_YUV444P;
 178
 179                 auto target_desc = pixel_format_desc(target_pix_fmt, width, height);
 180
 181                 auto write = frame_factory.create_frame(tag, target_desc);
 182
 183                 std::shared_ptr<SwsContext> sws_context;
 184
 185                 //CASPAR_LOG(warning) << "Hardware accelerated color transform not supported.";
 186
 187                 int64_t key = ((static_cast<int64_t>(width)                      << 32) & 0xFFFF00000000) |
 188                                           ((static_cast<int64_t>(height)                 << 16) & 0xFFFF0000) |
 189                                           ((static_cast<int64_t>(pix_fmt)                <<  8) & 0xFF00) |
 190                                           ((static_cast<int64_t>(target_pix_fmt) <<  0) & 0xFF);
 191
 192                 auto& pool = sws_contvalid_exts_[key];
 193
 194                 if(!pool.try_pop(sws_context))
 195                 {
 196                         double param;
 197                         sws_context.reset(sws_getContext(width, height, pix_fmt, width, height, target_pix_fmt, SWS_BILINEAR, nullptr, nullptr, &param), sws_freeContext);
 198                 }
 199
 200                 if(!sws_context)
 201                 {
 202                         CASPAR_THROW_EXCEPTION(operation_failed() << msg_info("Could not create software scaling context.") <<
 203                                                                         boost::errinfo_api_function("sws_getContext"));
 204                 }
 205
 206                 spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);
 207                 avcodec_get_frame_defaults(av_frame.get());
 208                 if(target_pix_fmt == PIX_FMT_BGRA)
 209                 {
 210                         auto size = avpicture_fill(reinterpret_cast<AVPicture*>(av_frame.get()), write.image_data(0).begin(), PIX_FMT_BGRA, width, height);
 211                         CASPAR_VERIFY(size == write.image_data(0).size());
 212                 }
 213                 else
 214                 {
 215                         av_frame->width  = width;
 216                         av_frame->height = height;
 217                         for(int n = 0; n < target_desc.planes.size(); ++n)
 218                         {
 219                                 av_frame->data[n]               = write.image_data(n).begin();
 220                                 av_frame->linesize[n]   = target_desc.planes[n].linesize;
 221                         }
 222                 }
 223
 224                 sws_scale(sws_context.get(), decoded_frame->data, decoded_frame->linesize, 0, height, av_frame->data, av_frame->linesize);
 225                 pool.push(sws_context);
 226
 227                 return std::move(write);
 228         }
 229         else
 230         {
 231                 auto write = frame_factory.create_frame(tag, desc);
 232
 233                 for(int n = 0; n < static_cast<int>(desc.planes.size()); ++n)
 234                 {
 235                         auto plane            = desc.planes[n];
 236                         auto result           = write.image_data(n).begin();
 237                         auto decoded          = decoded_frame->data[n];
 238                         auto decoded_linesize = decoded_frame->linesize[n];
 239
 240                         CASPAR_ASSERT(decoded);
 241                         CASPAR_ASSERT(write.image_data(n).begin());
 242
 243                         // Copy line by line since ffmpeg sometimes pads each line.
 244                         tbb::affinity_partitioner ap;
 245                         tbb::parallel_for(tbb::blocked_range<int>(0, desc.planes[n].height), [&](const tbb::blocked_range<int>& r)
 246                         {
 247                                 for(int y = r.begin(); y != r.end(); ++y)
 248                                         A_memcpy(result + y*plane.linesize, decoded + y*decoded_linesize, plane.linesize);
 249                         }, ap);
 250                 }
 251
 252                 return std::move(write);
 253         }
 254 }
 255
 256 spl::shared_ptr<AVFrame> make_av_frame(core::mutable_frame& frame)
 257 {
 258         std::array<uint8_t*, 4> data = {};
 259         for(int n = 0; n < frame.pixel_format_desc().planes.size(); ++n)
 260                 data[n] = frame.image_data(n).begin();
 261
 262         return make_av_frame(data, frame.pixel_format_desc());
 263 }
 264
 265 spl::shared_ptr<AVFrame> make_av_frame(std::array<uint8_t*, 4> data, const core::pixel_format_desc& pix_desc)
 266 {
 267         spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);
 268         avcodec_get_frame_defaults(av_frame.get());
 269
 270         auto planes              = pix_desc.planes;
 271         auto format              = pix_desc.format;
 272
 273         av_frame->width  = planes[0].width;
 274         av_frame->height = planes[0].height;
 275         for(int n = 0; n < planes.size(); ++n)
 276         {
 277                 av_frame->data[n]         = data[n];
 278                 av_frame->linesize[n] = planes[n].linesize;
 279         }
 280
 281         switch(format)
 282         {
 283         case core::pixel_format::rgb:
 284                 av_frame->format = PIX_FMT_RGB24;
 285                 break;
 286         case core::pixel_format::bgr:
 287                 av_frame->format = PIX_FMT_BGR24;
 288                 break;
 289         case core::pixel_format::rgba:
 290                 av_frame->format = PIX_FMT_RGBA;
 291                 break;
 292         case core::pixel_format::argb:
 293                 av_frame->format = PIX_FMT_ARGB;
 294                 break;
 295         case core::pixel_format::bgra:
 296                 av_frame->format = PIX_FMT_BGRA;
 297                 break;
 298         case core::pixel_format::abgr:
 299                 av_frame->format = PIX_FMT_ABGR;
 300                 break;
 301         case core::pixel_format::gray:
 302                 av_frame->format = PIX_FMT_GRAY8;
 303                 break;
 304         case core::pixel_format::ycbcr:
 305         {
 306                 int y_w = planes[0].width;
 307                 int y_h = planes[0].height;
 308                 int c_w = planes[1].width;
 309                 int c_h = planes[1].height;
 310
 311                 if(c_h == y_h && c_w == y_w)
 312                         av_frame->format = PIX_FMT_YUV444P;
 313                 else if(c_h == y_h && c_w*2 == y_w)
 314                         av_frame->format = PIX_FMT_YUV422P;
 315                 else if(c_h == y_h && c_w*4 == y_w)
 316                         av_frame->format = PIX_FMT_YUV411P;
 317                 else if(c_h*2 == y_h && c_w*2 == y_w)
 318                         av_frame->format = PIX_FMT_YUV420P;
 319                 else if(c_h*2 == y_h && c_w*4 == y_w)
 320                         av_frame->format = PIX_FMT_YUV410P;
 321
 322                 break;
 323         }
 324         case core::pixel_format::ycbcra:
 325                 av_frame->format = PIX_FMT_YUVA420P;
 326                 break;
 327         }
 328         return av_frame;
 329 }
 330
 331 bool is_sane_fps(AVRational time_base)
 332 {
 333         double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);
 334         return fps > 20.0 && fps < 65.0;
 335 }
 336
 337 AVRational fix_time_base(AVRational time_base)
 338 {
 339         if(time_base.num == 1)
 340                 time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(time_base.den)))-1));
 341
 342         if(!is_sane_fps(time_base))
 343         {
 344                 auto tmp = time_base;
 345                 tmp.den /= 2;
 346                 if(is_sane_fps(tmp))
 347                         time_base = tmp;
 348         }
 349
 350         return time_base;
 351 }
 352
 353 double read_fps(AVFormatContext& context, double fail_value)
 354 {
 355         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 356         auto audio_index = av_find_best_stream(&context, AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0);
 357
 358         if(video_index > -1)
 359         {
 360                 const auto video_context = context.streams[video_index]->codec;
 361                 const auto video_stream  = context.streams[video_index];
 362
 363                 AVRational time_base = video_context->time_base;
 364
 365                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")
 366                 {
 367                         try
 368                         {
 369                                 auto meta = read_flv_meta_info(context.filename);
 370                                 return boost::lexical_cast<double>(meta["framerate"]);
 371                         }
 372                         catch(...)
 373                         {
 374                                 return 0.0;
 375                         }
 376                 }
 377                 else
 378                 {
 379                         time_base.num *= video_context->ticks_per_frame;
 380
 381                         if(!is_sane_fps(time_base))
 382                         {
 383                                 time_base = fix_time_base(time_base);
 384
 385                                 if(!is_sane_fps(time_base) && audio_index > -1)
 386                                 {
 387                                         auto& audio_context = *context.streams[audio_index]->codec;
 388                                         auto& audio_stream  = *context.streams[audio_index];
 389
 390                                         double duration_sec = audio_stream.duration / static_cast<double>(audio_context.sample_rate);
 391
 392                                         time_base.num = static_cast<int>(duration_sec*100000.0);
 393                                         time_base.den = static_cast<int>(video_stream->nb_frames*100000);
 394                                 }
 395                         }
 396                 }
 397
 398                 double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);
 399
 400                 double closest_fps = 0.0;
 401
 402                 for (auto video_mode : enum_constants<core::video_format>())
 403                 {
 404                         auto format = core::video_format_desc(core::video_format(video_mode));
 405
 406                         double diff1 = std::abs(format.fps - fps);
 407                         double diff2 = std::abs(closest_fps - fps);
 408
 409                         if(diff1 < diff2)
 410                                 closest_fps = format.fps;
 411                 }
 412
 413                 return closest_fps;
 414         }
 415
 416         return fail_value;
 417 }
 418
 419 void fix_meta_data(AVFormatContext& context)
 420 {
 421         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 422
 423         if(video_index > -1)
 424         {
 425                 auto video_stream   = context.streams[video_index];
 426                 auto video_context  = context.streams[video_index]->codec;
 427
 428                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")
 429                 {
 430                         try
 431                         {
 432                                 auto meta = read_flv_meta_info(context.filename);
 433                                 double fps = boost::lexical_cast<double>(meta["framerate"]);
 434                                 video_stream->nb_frames = static_cast<int64_t>(boost::lexical_cast<double>(meta["duration"])*fps);
 435                         }
 436                         catch(...){}
 437                 }
 438                 else
 439                 {
 440                         auto stream_time = video_stream->time_base;
 441                         auto duration    = video_stream->duration;
 442                         auto codec_time  = video_context->time_base;
 443                         auto ticks               = video_context->ticks_per_frame;
 444
 445                         if(video_stream->nb_frames == 0)
 446                                 video_stream->nb_frames = (duration*stream_time.num*codec_time.den)/(stream_time.den*codec_time.num*ticks);
 447                 }
 448         }
 449 }
 450
 451 spl::shared_ptr<AVPacket> create_packet()
 452 {
 453         spl::shared_ptr<AVPacket> packet(new AVPacket(), [](AVPacket* p)
 454         {
 455                 av_free_packet(p);
 456                 delete p;
 457         });
 458
 459         av_init_packet(packet.get());
 460         return packet;
 461 }
 462
 463 spl::shared_ptr<AVFrame> create_frame()
 464 {
 465         spl::shared_ptr<AVFrame> frame(avcodec_alloc_frame(), av_free);
 466         avcodec_get_frame_defaults(frame.get());
 467         return frame;
 468 }
 469
 470 spl::shared_ptr<AVCodecContext> open_codec(AVFormatContext& context, enum AVMediaType type, int& index)
 471 {
 472         AVCodec* decoder;
 473         index = THROW_ON_ERROR2(av_find_best_stream(&context, type, -1, -1, &decoder, 0), "");
 474         //if(strcmp(decoder->name, "prores") == 0 && decoder->next && strcmp(decoder->next->name, "prores_lgpl") == 0)
 475         //      decoder = decoder->next;
 476
 477         THROW_ON_ERROR2(tbb_avcodec_open(context.streams[index]->codec, decoder), "");
 478         return spl::shared_ptr<AVCodecContext>(context.streams[index]->codec, tbb_avcodec_close);
 479 }
 480
 481 spl::shared_ptr<AVFormatContext> open_input(const std::wstring& filename)
 482 {
 483         AVFormatContext* weak_context = nullptr;
 484         THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(filename).c_str(), nullptr, nullptr), filename);
 485         spl::shared_ptr<AVFormatContext> context(weak_context, av_close_input_file);
 486         THROW_ON_ERROR2(avformat_find_stream_info(weak_context, nullptr), filename);
 487         fix_meta_data(*context);
 488         return context;
 489 }
 490
 491 std::wstring print_mode(int width, int height, double fps, bool interlaced)
 492 {
 493         std::wostringstream fps_ss;
 494         fps_ss << std::fixed << std::setprecision(2) << (!interlaced ? fps : 2.0 * fps);
 495
 496         return boost::lexical_cast<std::wstring>(width) + L"x" + boost::lexical_cast<std::wstring>(height) + (!interlaced ? L"p" : L"i") + fps_ss.str();
 497 }
 498
 499 bool is_valid_file(const std::wstring& filename)
 500 {
 501         static const auto invalid_exts = {
 502                 L".png",
 503                 L".tga",
 504                 L".bmp",
 505                 L".jpg",
 506                 L".jpeg",
 507                 L".gif",
 508                 L".tiff",
 509                 L".tif",
 510                 L".jp2",
 511                 L".jpx",
 512                 L".j2k",
 513                 L".j2c",
 514                 L".swf",
 515                 L".ct"
 516         };
 517         static const auto valid_exts = {
 518                 L".m2t",
 519                 L".mov",
 520                 L".mp4",
 521                 L".dv",
 522                 L".flv",
 523                 L".mpg",
 524                 L".wav",
 525                 L".mp3",
 526                 L".dnxhd",
 527                 L".h264",
 528                 L".prores"
 529         };
 530
 531         auto ext = boost::to_lower_copy(boost::filesystem::path(filename).extension().wstring());
 532
 533         if(std::find(valid_exts.begin(), valid_exts.end(), ext) != valid_exts.end())
 534                 return true;
 535
 536         if(std::find(invalid_exts.begin(), invalid_exts.end(), ext) != invalid_exts.end())
 537                 return false;
 538
 539         auto u8filename = u8(filename);
 540
 541         int score = 0;
 542         AVProbeData pb = {};
 543         pb.filename = u8filename.c_str();
 544
 545         if(av_probe_input_format2(&pb, false, &score) != nullptr)
 546                 return true;
 547
 548         std::ifstream file(u8filename);
 549
 550         std::vector<unsigned char> buf;
 551         for(auto file_it = std::istreambuf_iterator<char>(file); file_it != std::istreambuf_iterator<char>() && buf.size() < 1024; ++file_it)
 552                 buf.push_back(*file_it);
 553
 554         if(buf.empty())
 555                 return nullptr;
 556
 557         pb.buf          = buf.data();
 558         pb.buf_size = static_cast<int>(buf.size());
 559
 560         return av_probe_input_format2(&pb, true, &score) != nullptr;
 561 }
 562
 563 bool try_get_duration(const std::wstring filename, std::int64_t& duration, boost::rational<std::int64_t>& time_base)
 564 {
 565         AVFormatContext* weak_context = nullptr;
 566         if (avformat_open_input(&weak_context, u8(filename).c_str(), nullptr, nullptr) < 0)
 567                 return false;
 568
 569         std::shared_ptr<AVFormatContext> context(weak_context, av_close_input_file);
 570
 571         context->probesize = context->probesize / 10;
 572         context->max_analyze_duration = context->probesize / 10;
 573
 574         if (avformat_find_stream_info(context.get(), nullptr) < 0)
 575                 return false;
 576
 577         const auto fps = read_fps(*context, 1.0);
 578
 579         const auto rational_fps = boost::rational<std::int64_t>(static_cast<int>(fps * AV_TIME_BASE), AV_TIME_BASE);
 580
 581         duration = boost::rational_cast<std::int64_t>(context->duration * rational_fps / AV_TIME_BASE);
 582
 583         if (rational_fps == 0)
 584                 return false;
 585
 586         time_base = 1 / rational_fps;
 587
 588         return true;
 589 }
 590
 591 std::wstring probe_stem(const std::wstring& stem)
 592 {
 593         auto stem2 = boost::filesystem::path(stem);
 594         auto parent = find_case_insensitive(stem2.parent_path().wstring());
 595
 596         if (!parent)
 597                 return L"";
 598
 599         auto dir = boost::filesystem::path(*parent);
 600
 601         for(auto it = boost::filesystem::directory_iterator(dir); it != boost::filesystem::directory_iterator(); ++it)
 602         {
 603                 if(boost::iequals(it->path().stem().wstring(), stem2.filename().wstring()) && is_valid_file(it->path().wstring()))
 604                         return it->path().wstring();
 605         }
 606         return L"";
 607 }
 608 //
 609 //void av_dup_frame(AVFrame* frame)
 610 //{
 611 //      AVFrame* new_frame = avcodec_alloc_frame();
 612 //
 613 //
 614 //      const uint8_t *src_data[4] = {0};
 615 //      memcpy(const_cast<uint8_t**>(&src_data[0]), frame->data, 4);
 616 //      const int src_linesizes[4] = {0};
 617 //      memcpy(const_cast<int*>(&src_linesizes[0]), frame->linesize, 4);
 618 //
 619 //      av_image_alloc(new_frame->data, new_frame->linesize, new_frame->width, new_frame->height, frame->format, 16);
 620 //
 621 //      av_image_copy(new_frame->data, new_frame->linesize, src_data, src_linesizes, frame->format, new_frame->width, new_frame->height);
 622 //
 623 //      frame =
 624 //}
 625
 626 }}