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/frame/audio_channel_layout.h>
  38 #include <core/producer/frame_producer.h>
  39
  40 #include <common/except.h>
  41 #include <common/array.h>
  42 #include <common/os/filesystem.h>
  43 #include <common/memcpy.h>
  44
  45 #include <tbb/parallel_for.h>
  46
  47 #include <common/assert.h>
  48 #include <boost/filesystem.hpp>
  49 #include <boost/lexical_cast.hpp>
  50 #include <boost/rational.hpp>
  51
  52 #include <fstream>
  53
  54 #include <asmlib.h>
  55
  56 #if defined(_MSC_VER)
  57 #pragma warning (push)
  58 #pragma warning (disable : 4244)
  59 #endif
  60 extern "C"
  61 {
  62         #include <libswscale/swscale.h>
  63         #include <libavcodec/avcodec.h>
  64         #include <libavformat/avformat.h>
  65 }
  66 #if defined(_MSC_VER)
  67 #pragma warning (pop)
  68 #endif
  69
  70 namespace caspar { namespace ffmpeg {
  71
  72 core::field_mode get_mode(const AVFrame& frame)
  73 {
  74         if(!frame.interlaced_frame)
  75                 return core::field_mode::progressive;
  76
  77         return frame.top_field_first ? core::field_mode::upper : core::field_mode::lower;
  78 }
  79
  80 core::pixel_format get_pixel_format(PixelFormat pix_fmt)
  81 {
  82         switch(pix_fmt)
  83         {
  84         case PIX_FMT_GRAY8:                     return core::pixel_format::gray;
  85         case PIX_FMT_RGB24:                     return core::pixel_format::rgb;
  86         case PIX_FMT_BGR24:                     return core::pixel_format::bgr;
  87         case PIX_FMT_BGRA:                      return core::pixel_format::bgra;
  88         case PIX_FMT_ARGB:                      return core::pixel_format::argb;
  89         case PIX_FMT_RGBA:                      return core::pixel_format::rgba;
  90         case PIX_FMT_ABGR:                      return core::pixel_format::abgr;
  91         case PIX_FMT_YUV444P:           return core::pixel_format::ycbcr;
  92         case PIX_FMT_YUV422P:           return core::pixel_format::ycbcr;
  93         case PIX_FMT_YUV420P:           return core::pixel_format::ycbcr;
  94         case PIX_FMT_YUV411P:           return core::pixel_format::ycbcr;
  95         case PIX_FMT_YUV410P:           return core::pixel_format::ycbcr;
  96         case PIX_FMT_YUVA420P:          return core::pixel_format::ycbcra;
  97         default:                                        return core::pixel_format::invalid;
  98         }
  99 }
 100
 101 core::pixel_format_desc pixel_format_desc(PixelFormat pix_fmt, int width, int height)
 102 {
 103         // Get linesizes
 104         AVPicture dummy_pict;
 105         avpicture_fill(&dummy_pict, nullptr, pix_fmt, width, height);
 106
 107         core::pixel_format_desc desc = get_pixel_format(pix_fmt);
 108
 109         switch(desc.format)
 110         {
 111         case core::pixel_format::gray:
 112         case core::pixel_format::luma:
 113                 {
 114                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));
 115                         return desc;
 116                 }
 117         case core::pixel_format::bgr:
 118         case core::pixel_format::rgb:
 119                 {
 120                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0]/3, height, 3));
 121                         return desc;
 122                 }
 123         case core::pixel_format::bgra:
 124         case core::pixel_format::argb:
 125         case core::pixel_format::rgba:
 126         case core::pixel_format::abgr:
 127                 {
 128                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0]/4, height, 4));
 129                         return desc;
 130                 }
 131         case core::pixel_format::ycbcr:
 132         case core::pixel_format::ycbcra:
 133                 {
 134                         // Find chroma height
 135                         int size2 = static_cast<int>(dummy_pict.data[2] - dummy_pict.data[1]);
 136                         int h2 = size2/dummy_pict.linesize[1];
 137
 138                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));
 139                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[1], h2, 1));
 140                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[2], h2, 1));
 141
 142                         if(desc.format == core::pixel_format::ycbcra)
 143                                 desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[3], height, 1));
 144                         return desc;
 145                 }
 146         default:
 147                 desc.format = core::pixel_format::invalid;
 148                 return desc;
 149         }
 150 }
 151
 152 core::mutable_frame make_frame(const void* tag, const spl::shared_ptr<AVFrame>& decoded_frame, core::frame_factory& frame_factory, const core::audio_channel_layout& channel_layout)
 153 {
 154         static tbb::concurrent_unordered_map<int64_t, tbb::concurrent_queue<std::shared_ptr<SwsContext>>> sws_contvalid_exts_;
 155
 156         if(decoded_frame->width < 1 || decoded_frame->height < 1)
 157                 return frame_factory.create_frame(tag, core::pixel_format_desc(core::pixel_format::invalid), core::audio_channel_layout::invalid());
 158
 159         const auto width  = decoded_frame->width;
 160         const auto height = decoded_frame->height;
 161         auto desc                 = pixel_format_desc(static_cast<PixelFormat>(decoded_frame->format), width, height);
 162
 163         if(desc.format == core::pixel_format::invalid)
 164         {
 165                 auto pix_fmt = static_cast<PixelFormat>(decoded_frame->format);
 166                 auto target_pix_fmt = PIX_FMT_BGRA;
 167
 168                 if(pix_fmt == PIX_FMT_UYVY422)
 169                         target_pix_fmt = PIX_FMT_YUV422P;
 170                 else if(pix_fmt == PIX_FMT_YUYV422)
 171                         target_pix_fmt = PIX_FMT_YUV422P;
 172                 else if(pix_fmt == PIX_FMT_UYYVYY411)
 173                         target_pix_fmt = PIX_FMT_YUV411P;
 174                 else if(pix_fmt == PIX_FMT_YUV420P10)
 175                         target_pix_fmt = PIX_FMT_YUV420P;
 176                 else if(pix_fmt == PIX_FMT_YUV422P10)
 177                         target_pix_fmt = PIX_FMT_YUV422P;
 178                 else if(pix_fmt == PIX_FMT_YUV444P10)
 179                         target_pix_fmt = PIX_FMT_YUV444P;
 180
 181                 auto target_desc = pixel_format_desc(target_pix_fmt, width, height);
 182
 183                 auto write = frame_factory.create_frame(tag, target_desc, channel_layout);
 184
 185                 std::shared_ptr<SwsContext> sws_context;
 186
 187                 //CASPAR_LOG(warning) << "Hardware accelerated color transform not supported.";
 188
 189                 int64_t key = ((static_cast<int64_t>(width)                      << 32) & 0xFFFF00000000) |
 190                                           ((static_cast<int64_t>(height)                 << 16) & 0xFFFF0000) |
 191                                           ((static_cast<int64_t>(pix_fmt)                <<  8) & 0xFF00) |
 192                                           ((static_cast<int64_t>(target_pix_fmt) <<  0) & 0xFF);
 193
 194                 auto& pool = sws_contvalid_exts_[key];
 195
 196                 if(!pool.try_pop(sws_context))
 197                 {
 198                         double param;
 199                         sws_context.reset(sws_getContext(width, height, pix_fmt, width, height, target_pix_fmt, SWS_BILINEAR, nullptr, nullptr, &param), sws_freeContext);
 200                 }
 201
 202                 if(!sws_context)
 203                 {
 204                         CASPAR_THROW_EXCEPTION(operation_failed() << msg_info("Could not create software scaling context.") <<
 205                                                                         boost::errinfo_api_function("sws_getContext"));
 206                 }
 207
 208                 spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);
 209                 avcodec_get_frame_defaults(av_frame.get());
 210                 if(target_pix_fmt == PIX_FMT_BGRA)
 211                 {
 212                         auto size = avpicture_fill(reinterpret_cast<AVPicture*>(av_frame.get()), write.image_data(0).begin(), PIX_FMT_BGRA, width, height);
 213                         CASPAR_VERIFY(size == write.image_data(0).size());
 214                 }
 215                 else
 216                 {
 217                         av_frame->width  = width;
 218                         av_frame->height = height;
 219                         for(int n = 0; n < target_desc.planes.size(); ++n)
 220                         {
 221                                 av_frame->data[n]               = write.image_data(n).begin();
 222                                 av_frame->linesize[n]   = target_desc.planes[n].linesize;
 223                         }
 224                 }
 225
 226                 sws_scale(sws_context.get(), decoded_frame->data, decoded_frame->linesize, 0, height, av_frame->data, av_frame->linesize);
 227                 pool.push(sws_context);
 228
 229                 return std::move(write);
 230         }
 231         else
 232         {
 233                 auto write = frame_factory.create_frame(tag, desc, channel_layout);
 234
 235                 for(int n = 0; n < static_cast<int>(desc.planes.size()); ++n)
 236                 {
 237                         auto plane            = desc.planes[n];
 238                         auto result           = write.image_data(n).begin();
 239                         auto decoded          = decoded_frame->data[n];
 240                         auto decoded_linesize = decoded_frame->linesize[n];
 241
 242                         CASPAR_ASSERT(decoded);
 243                         CASPAR_ASSERT(write.image_data(n).begin());
 244
 245                         if (decoded_linesize != plane.linesize)
 246                         {
 247                                 // Copy line by line since ffmpeg sometimes pads each line.
 248                                 tbb::affinity_partitioner ap;
 249                                 tbb::parallel_for(tbb::blocked_range<int>(0, desc.planes[n].height), [&](const tbb::blocked_range<int>& r)
 250                                 {
 251                                         for (int y = r.begin(); y != r.end(); ++y)
 252                                                 A_memcpy(result + y*plane.linesize, decoded + y*decoded_linesize, plane.linesize);
 253                                 }, ap);
 254                         }
 255                         else
 256                         {
 257                                 fast_memcpy(result, decoded, plane.size);
 258                         }
 259                 }
 260
 261                 return std::move(write);
 262         }
 263 }
 264
 265 spl::shared_ptr<AVFrame> make_av_frame(core::mutable_frame& frame)
 266 {
 267         std::array<uint8_t*, 4> data = {};
 268         for(int n = 0; n < frame.pixel_format_desc().planes.size(); ++n)
 269                 data[n] = frame.image_data(n).begin();
 270
 271         return make_av_frame(data, frame.pixel_format_desc());
 272 }
 273
 274 spl::shared_ptr<AVFrame> make_av_frame(std::array<uint8_t*, 4> data, const core::pixel_format_desc& pix_desc)
 275 {
 276         spl::shared_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);
 277         avcodec_get_frame_defaults(av_frame.get());
 278
 279         auto planes              = pix_desc.planes;
 280         auto format              = pix_desc.format;
 281
 282         av_frame->width  = planes[0].width;
 283         av_frame->height = planes[0].height;
 284         for(int n = 0; n < planes.size(); ++n)
 285         {
 286                 av_frame->data[n]         = data[n];
 287                 av_frame->linesize[n] = planes[n].linesize;
 288         }
 289
 290         switch(format)
 291         {
 292         case core::pixel_format::rgb:
 293                 av_frame->format = PIX_FMT_RGB24;
 294                 break;
 295         case core::pixel_format::bgr:
 296                 av_frame->format = PIX_FMT_BGR24;
 297                 break;
 298         case core::pixel_format::rgba:
 299                 av_frame->format = PIX_FMT_RGBA;
 300                 break;
 301         case core::pixel_format::argb:
 302                 av_frame->format = PIX_FMT_ARGB;
 303                 break;
 304         case core::pixel_format::bgra:
 305                 av_frame->format = PIX_FMT_BGRA;
 306                 break;
 307         case core::pixel_format::abgr:
 308                 av_frame->format = PIX_FMT_ABGR;
 309                 break;
 310         case core::pixel_format::gray:
 311                 av_frame->format = PIX_FMT_GRAY8;
 312                 break;
 313         case core::pixel_format::ycbcr:
 314         {
 315                 int y_w = planes[0].width;
 316                 int y_h = planes[0].height;
 317                 int c_w = planes[1].width;
 318                 int c_h = planes[1].height;
 319
 320                 if(c_h == y_h && c_w == y_w)
 321                         av_frame->format = PIX_FMT_YUV444P;
 322                 else if(c_h == y_h && c_w*2 == y_w)
 323                         av_frame->format = PIX_FMT_YUV422P;
 324                 else if(c_h == y_h && c_w*4 == y_w)
 325                         av_frame->format = PIX_FMT_YUV411P;
 326                 else if(c_h*2 == y_h && c_w*2 == y_w)
 327                         av_frame->format = PIX_FMT_YUV420P;
 328                 else if(c_h*2 == y_h && c_w*4 == y_w)
 329                         av_frame->format = PIX_FMT_YUV410P;
 330
 331                 break;
 332         }
 333         case core::pixel_format::ycbcra:
 334                 av_frame->format = PIX_FMT_YUVA420P;
 335                 break;
 336         }
 337         return av_frame;
 338 }
 339
 340 bool is_sane_fps(AVRational time_base)
 341 {
 342         double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);
 343         return fps > 20.0 && fps < 65.0;
 344 }
 345
 346 AVRational fix_time_base(AVRational time_base)
 347 {
 348         if(time_base.num == 1)
 349                 time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(time_base.den)))-1));
 350
 351         if(!is_sane_fps(time_base))
 352         {
 353                 auto tmp = time_base;
 354                 tmp.den /= 2;
 355                 if(is_sane_fps(tmp))
 356                         time_base = tmp;
 357         }
 358
 359         return time_base;
 360 }
 361
 362 double read_fps(AVFormatContext& context, double fail_value)
 363 {
 364         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 365         auto audio_index = av_find_best_stream(&context, AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0);
 366
 367         if(video_index > -1)
 368         {
 369                 const auto video_context = context.streams[video_index]->codec;
 370                 const auto video_stream  = context.streams[video_index];
 371
 372                 auto frame_rate_time_base = video_stream->avg_frame_rate;
 373                 std::swap(frame_rate_time_base.num, frame_rate_time_base.den);
 374
 375                 if (is_sane_fps(frame_rate_time_base))
 376                 {
 377                         return static_cast<double>(frame_rate_time_base.den) / static_cast<double>(frame_rate_time_base.num);
 378                 }
 379
 380                 AVRational time_base = video_context->time_base;
 381
 382                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")
 383                 {
 384                         try
 385                         {
 386                                 auto meta = read_flv_meta_info(context.filename);
 387                                 return boost::lexical_cast<double>(meta["framerate"]);
 388                         }
 389                         catch(...)
 390                         {
 391                                 return 0.0;
 392                         }
 393                 }
 394                 else
 395                 {
 396                         time_base.num *= video_context->ticks_per_frame;
 397
 398                         if(!is_sane_fps(time_base))
 399                         {
 400                                 time_base = fix_time_base(time_base);
 401
 402                                 if(!is_sane_fps(time_base) && audio_index > -1)
 403                                 {
 404                                         auto& audio_context = *context.streams[audio_index]->codec;
 405                                         auto& audio_stream  = *context.streams[audio_index];
 406
 407                                         double duration_sec = audio_stream.duration / static_cast<double>(audio_context.sample_rate);
 408
 409                                         time_base.num = static_cast<int>(duration_sec*100000.0);
 410                                         time_base.den = static_cast<int>(video_stream->nb_frames*100000);
 411                                 }
 412                         }
 413                 }
 414
 415                 double fps = static_cast<double>(time_base.den) / static_cast<double>(time_base.num);
 416
 417                 double closest_fps = 0.0;
 418
 419                 for (auto video_mode : enum_constants<core::video_format>())
 420                 {
 421                         auto format = core::video_format_desc(core::video_format(video_mode));
 422
 423                         double diff1 = std::abs(format.fps - fps);
 424                         double diff2 = std::abs(closest_fps - fps);
 425
 426                         if(diff1 < diff2)
 427                                 closest_fps = format.fps;
 428                 }
 429
 430                 return closest_fps;
 431         }
 432
 433         return fail_value;
 434 }
 435
 436 void fix_meta_data(AVFormatContext& context)
 437 {
 438         auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 439
 440         if(video_index > -1)
 441         {
 442                 auto video_stream   = context.streams[video_index];
 443                 auto video_context  = context.streams[video_index]->codec;
 444
 445                 if(boost::filesystem::path(context.filename).extension().string() == ".flv")
 446                 {
 447                         try
 448                         {
 449                                 auto meta = read_flv_meta_info(context.filename);
 450                                 double fps = boost::lexical_cast<double>(meta["framerate"]);
 451                                 video_stream->nb_frames = static_cast<int64_t>(boost::lexical_cast<double>(meta["duration"])*fps);
 452                         }
 453                         catch(...){}
 454                 }
 455                 else
 456                 {
 457                         auto stream_time = video_stream->time_base;
 458                         auto duration    = video_stream->duration;
 459                         auto codec_time  = video_context->time_base;
 460                         auto ticks               = video_context->ticks_per_frame;
 461
 462                         if(video_stream->nb_frames == 0)
 463                                 video_stream->nb_frames = (duration*stream_time.num*codec_time.den)/(stream_time.den*codec_time.num*ticks);
 464                 }
 465         }
 466 }
 467
 468 spl::shared_ptr<AVPacket> create_packet()
 469 {
 470         spl::shared_ptr<AVPacket> packet(new AVPacket(), [](AVPacket* p)
 471         {
 472                 av_free_packet(p);
 473                 delete p;
 474         });
 475
 476         av_init_packet(packet.get());
 477         return packet;
 478 }
 479
 480 spl::shared_ptr<AVFrame> create_frame()
 481 {
 482         spl::shared_ptr<AVFrame> frame(avcodec_alloc_frame(), av_free);
 483         avcodec_get_frame_defaults(frame.get());
 484         return frame;
 485 }
 486
 487 spl::shared_ptr<AVCodecContext> open_codec(AVFormatContext& context, enum AVMediaType type, int& index, bool single_threaded)
 488 {
 489         AVCodec* decoder;
 490         index = THROW_ON_ERROR2(av_find_best_stream(&context, type, -1, -1, &decoder, 0), "");
 491         //if(strcmp(decoder->name, "prores") == 0 && decoder->next && strcmp(decoder->next->name, "prores_lgpl") == 0)
 492         //      decoder = decoder->next;
 493
 494         THROW_ON_ERROR2(tbb_avcodec_open(context.streams[index]->codec, decoder, single_threaded), "");
 495         return spl::shared_ptr<AVCodecContext>(context.streams[index]->codec, tbb_avcodec_close);
 496 }
 497
 498 spl::shared_ptr<AVFormatContext> open_input(const std::wstring& filename)
 499 {
 500         AVFormatContext* weak_context = nullptr;
 501         THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(filename).c_str(), nullptr, nullptr), filename);
 502         spl::shared_ptr<AVFormatContext> context(weak_context, [](AVFormatContext* p)
 503         {
 504                 avformat_close_input(&p);
 505         });
 506         THROW_ON_ERROR2(avformat_find_stream_info(weak_context, nullptr), filename);
 507         fix_meta_data(*context);
 508         return context;
 509 }
 510
 511 std::wstring print_mode(int width, int height, double fps, bool interlaced)
 512 {
 513         std::wostringstream fps_ss;
 514         fps_ss << std::fixed << std::setprecision(2) << (!interlaced ? fps : 2.0 * fps);
 515
 516         return boost::lexical_cast<std::wstring>(width) + L"x" + boost::lexical_cast<std::wstring>(height) + (!interlaced ? L"p" : L"i") + fps_ss.str();
 517 }
 518
 519 bool is_valid_file(const std::wstring& filename, bool only_video)
 520 {
 521         static const auto invalid_exts = {
 522                 L".png",
 523                 L".tga",
 524                 L".bmp",
 525                 L".jpg",
 526                 L".jpeg",
 527                 L".gif",
 528                 L".tiff",
 529                 L".tif",
 530                 L".jp2",
 531                 L".jpx",
 532                 L".j2k",
 533                 L".j2c",
 534                 L".swf",
 535                 L".ct"
 536         };
 537         static const auto only_audio = {
 538                 L".mp3",
 539                 L".wav",
 540                 L".wma"
 541         };
 542         static const auto valid_exts = {
 543                 L".m2t",
 544                 L".mov",
 545                 L".mp4",
 546                 L".dv",
 547                 L".flv",
 548                 L".mpg",
 549                 L".dnxhd",
 550                 L".h264",
 551                 L".prores"
 552         };
 553
 554         auto ext = boost::to_lower_copy(boost::filesystem::path(filename).extension().wstring());
 555
 556         if(std::find(valid_exts.begin(), valid_exts.end(), ext) != valid_exts.end())
 557                 return true;
 558
 559         if (!only_video && std::find(only_audio.begin(), only_audio.end(), ext) != only_audio.end())
 560                 return true;
 561
 562         if(std::find(invalid_exts.begin(), invalid_exts.end(), ext) != invalid_exts.end())
 563                 return false;
 564
 565         if (only_video && std::find(only_audio.begin(), only_audio.end(), ext) != only_audio.end())
 566                 return false;
 567
 568         auto u8filename = u8(filename);
 569
 570         int score = 0;
 571         AVProbeData pb = {};
 572         pb.filename = u8filename.c_str();
 573
 574         if(av_probe_input_format2(&pb, false, &score) != nullptr)
 575                 return true;
 576
 577         std::ifstream file(u8filename);
 578
 579         std::vector<unsigned char> buf;
 580         for(auto file_it = std::istreambuf_iterator<char>(file); file_it != std::istreambuf_iterator<char>() && buf.size() < 1024; ++file_it)
 581                 buf.push_back(*file_it);
 582
 583         if(buf.empty())
 584                 return nullptr;
 585
 586         pb.buf          = buf.data();
 587         pb.buf_size = static_cast<int>(buf.size());
 588
 589         return av_probe_input_format2(&pb, true, &score) != nullptr;
 590 }
 591
 592 bool try_get_duration(const std::wstring filename, std::int64_t& duration, boost::rational<std::int64_t>& time_base)
 593 {
 594         AVFormatContext* weak_context = nullptr;
 595         if (avformat_open_input(&weak_context, u8(filename).c_str(), nullptr, nullptr) < 0)
 596                 return false;
 597
 598         std::shared_ptr<AVFormatContext> context(weak_context, [](AVFormatContext* p)
 599         {
 600                 avformat_close_input(&p);
 601         });
 602
 603         context->probesize = context->probesize / 10;
 604         context->max_analyze_duration = context->probesize / 10;
 605
 606         if (avformat_find_stream_info(context.get(), nullptr) < 0)
 607                 return false;
 608
 609         const auto fps = read_fps(*context, 1.0);
 610
 611         const auto rational_fps = boost::rational<std::int64_t>(static_cast<int>(fps * AV_TIME_BASE), AV_TIME_BASE);
 612
 613         duration = boost::rational_cast<std::int64_t>(context->duration * rational_fps / AV_TIME_BASE);
 614
 615         if (rational_fps == 0)
 616                 return false;
 617
 618         time_base = 1 / rational_fps;
 619
 620         return true;
 621 }
 622
 623 std::wstring probe_stem(const std::wstring& stem, bool only_video)
 624 {
 625         auto stem2 = boost::filesystem::path(stem);
 626         auto parent = find_case_insensitive(stem2.parent_path().wstring());
 627
 628         if (!parent)
 629                 return L"";
 630
 631         auto dir = boost::filesystem::path(*parent);
 632
 633         for(auto it = boost::filesystem::directory_iterator(dir); it != boost::filesystem::directory_iterator(); ++it)
 634         {
 635                 if(boost::iequals(it->path().stem().wstring(), stem2.filename().wstring()) && is_valid_file(it->path().wstring(), only_video))
 636                         return it->path().wstring();
 637         }
 638         return L"";
 639 }
 640
 641 core::audio_channel_layout get_audio_channel_layout(const AVCodecContext& codec_context, const std::wstring& channel_layout_spec)
 642 {
 643         auto num_channels = codec_context.channels;
 644
 645         if (!channel_layout_spec.empty())
 646         {
 647                 if (boost::contains(channel_layout_spec, L":")) // Custom on the fly layout specified.
 648                 {
 649                         std::vector<std::wstring> type_and_channel_order;
 650                         boost::split(type_and_channel_order, channel_layout_spec, boost::is_any_of(L":"), boost::algorithm::token_compress_off);
 651                         auto& type                      = type_and_channel_order.at(0);
 652                         auto& order                     = type_and_channel_order.at(1);
 653
 654                         return core::audio_channel_layout(num_channels, std::move(type), order);
 655                 }
 656                 else // Preconfigured named channel layout selected.
 657                 {
 658                         auto layout = core::audio_channel_layout_repository::get_default()->get_layout(channel_layout_spec);
 659
 660                         if (!layout)
 661                                 CASPAR_THROW_EXCEPTION(user_error() << msg_info(L"No channel layout with name " + channel_layout_spec + L" registered"));
 662
 663                         layout->num_channels = num_channels;
 664
 665                         return *layout;
 666                 }
 667         }
 668
 669         if (!codec_context.channel_layout)
 670         {
 671                 if (num_channels == 1)
 672                         return core::audio_channel_layout(num_channels, L"mono", L"FC");
 673                 else if (num_channels == 2)
 674                         return core::audio_channel_layout(num_channels, L"stereo", L"FL FR");
 675                 else
 676                         return core::audio_channel_layout(num_channels, L"", L""); // Passthru without named channels as is.
 677         }
 678
 679         // What FFmpeg calls "channel layout" is only the "layout type" of a channel layout in
 680         // CasparCG where the channel layout supports different orders as well.
 681         // The user needs to provide additional mix-configs in casparcg.config to support more
 682         // than the most common (5.1, mono and stereo) types.
 683
 684         // Based on information in https://ffmpeg.org/ffmpeg-utils.html#Channel-Layout
 685         switch (codec_context.channel_layout)
 686         {
 687         case AV_CH_LAYOUT_MONO:
 688                 return core::audio_channel_layout(num_channels, L"mono",                        L"FC");
 689         case AV_CH_LAYOUT_STEREO:
 690                 return core::audio_channel_layout(num_channels, L"stereo",                      L"FL FR");
 691         case AV_CH_LAYOUT_2POINT1:
 692                 return core::audio_channel_layout(num_channels, L"2.1",                         L"FL FR LFE");
 693         case AV_CH_LAYOUT_SURROUND:
 694                 return core::audio_channel_layout(num_channels, L"3.0",                         L"FL FR FC");
 695         case AV_CH_LAYOUT_2_1:
 696                 return core::audio_channel_layout(num_channels, L"3.0(back)",           L"FL FR BC");
 697         case AV_CH_LAYOUT_4POINT0:
 698                 return core::audio_channel_layout(num_channels, L"4.0",                         L"FL FR FC BC");
 699         case AV_CH_LAYOUT_QUAD:
 700                 return core::audio_channel_layout(num_channels, L"quad",                        L"FL FR BL BR");
 701         case AV_CH_LAYOUT_2_2:
 702                 return core::audio_channel_layout(num_channels, L"quad(side)",          L"FL FR SL SR");
 703         case AV_CH_LAYOUT_3POINT1:
 704                 return core::audio_channel_layout(num_channels, L"3.1",                         L"FL FR FC LFE");
 705         case AV_CH_LAYOUT_5POINT0_BACK:
 706                 return core::audio_channel_layout(num_channels, L"5.0",                         L"FL FR FC BL BR");
 707         case AV_CH_LAYOUT_5POINT0:
 708                 return core::audio_channel_layout(num_channels, L"5.0(side)",           L"FL FR FC SL SR");
 709         case AV_CH_LAYOUT_4POINT1:
 710                 return core::audio_channel_layout(num_channels, L"4.1",                         L"FL FR FC LFE BC");
 711         case AV_CH_LAYOUT_5POINT1_BACK:
 712                 return core::audio_channel_layout(num_channels, L"5.1",                         L"FL FR FC LFE BL BR");
 713         case AV_CH_LAYOUT_5POINT1:
 714                 return core::audio_channel_layout(num_channels, L"5.1(side)",           L"FL FR FC LFE SL SR");
 715         case AV_CH_LAYOUT_6POINT0:
 716                 return core::audio_channel_layout(num_channels, L"6.0",                         L"FL FR FC BC SL SR");
 717         case AV_CH_LAYOUT_6POINT0_FRONT:
 718                 return core::audio_channel_layout(num_channels, L"6.0(front)",          L"FL FR FLC FRC SL SR");
 719         case AV_CH_LAYOUT_HEXAGONAL:
 720                 return core::audio_channel_layout(num_channels, L"hexagonal",           L"FL FR FC BL BR BC");
 721         case AV_CH_LAYOUT_6POINT1:
 722                 return core::audio_channel_layout(num_channels, L"6.1",                         L"FL FR FC LFE BC SL SR");
 723         case AV_CH_LAYOUT_6POINT1_BACK:
 724                 return core::audio_channel_layout(num_channels, L"6.1(back)",           L"FL FR FC LFE BL BR BC");
 725         case AV_CH_LAYOUT_6POINT1_FRONT:
 726                 return core::audio_channel_layout(num_channels, L"6.1(front)",          L"FL FR LFE FLC FRC SL SR");
 727         case AV_CH_LAYOUT_7POINT0:
 728                 return core::audio_channel_layout(num_channels, L"7.0",                         L"FL FR FC BL BR SL SR");
 729         case AV_CH_LAYOUT_7POINT0_FRONT:
 730                 return core::audio_channel_layout(num_channels, L"7.0(front)",          L"FL FR FC FLC FRC SL SR");
 731         case AV_CH_LAYOUT_7POINT1:
 732                 return core::audio_channel_layout(num_channels, L"7.1",                         L"FL FR FC LFE BL BR SL SR");
 733         case AV_CH_LAYOUT_7POINT1_WIDE_BACK:
 734                 return core::audio_channel_layout(num_channels, L"7.1(wide)",           L"FL FR FC LFE BL BR FLC FRC");
 735         case AV_CH_LAYOUT_7POINT1_WIDE:
 736                 return core::audio_channel_layout(num_channels, L"7.1(wide-side)",      L"FL FR FC LFE FLC FRC SL SR");
 737         case AV_CH_LAYOUT_STEREO_DOWNMIX:
 738                 return core::audio_channel_layout(num_channels, L"downmix",                     L"DL DR");
 739         default:
 740                 // Passthru
 741                 return core::audio_channel_layout(num_channels, L"", L"");
 742         }
 743 }
 744
 745 // av_get_default_channel_layout does not work for layouts not predefined in ffmpeg. This is needed to support > 8 channels.
 746 std::int64_t create_channel_layout_bitmask(int num_channels)
 747 {
 748         if (num_channels > 63)
 749                 CASPAR_THROW_EXCEPTION(invalid_argument() << msg_info(L"FFmpeg cannot handle more than 63 audio channels"));
 750
 751         const auto ALL_63_CHANNELS = 0x7FFFFFFFFFFFFFFFULL;
 752
 753         auto to_shift = 63 - num_channels;
 754         auto result = ALL_63_CHANNELS >> to_shift;
 755
 756         return static_cast<std::int64_t>(result);
 757 }
 758
 759 //
 760 //void av_dup_frame(AVFrame* frame)
 761 //{
 762 //      AVFrame* new_frame = avcodec_alloc_frame();
 763 //
 764 //
 765 //      const uint8_t *src_data[4] = {0};
 766 //      memcpy(const_cast<uint8_t**>(&src_data[0]), frame->data, 4);
 767 //      const int src_linesizes[4] = {0};
 768 //      memcpy(const_cast<int*>(&src_linesizes[0]), frame->linesize, 4);
 769 //
 770 //      av_image_alloc(new_frame->data, new_frame->linesize, new_frame->width, new_frame->height, frame->format, 16);
 771 //
 772 //      av_image_copy(new_frame->data, new_frame->linesize, src_data, src_linesizes, frame->format, new_frame->width, new_frame->height);
 773 //
 774 //      frame =
 775 //}
 776
 777 }}