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