src/lib/ffmpeg_content.cc

   1 /*
   2     Copyright (C) 2013-2019 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic 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 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "ffmpeg_content.h"
  22 #include "video_content.h"
  23 #include "audio_content.h"
  24 #include "ffmpeg_examiner.h"
  25 #include "ffmpeg_subtitle_stream.h"
  26 #include "ffmpeg_audio_stream.h"
  27 #include "compose.hpp"
  28 #include "job.h"
  29 #include "util.h"
  30 #include "filter.h"
  31 #include "film.h"
  32 #include "log.h"
  33 #include "config.h"
  34 #include "exceptions.h"
  35 #include "frame_rate_change.h"
  36 #include "text_content.h"
  37 #include <dcp/raw_convert.h>
  38 #include <libcxml/cxml.h>
  39 extern "C" {
  40 #include <libavformat/avformat.h>
  41 #include <libavutil/pixdesc.h>
  42 }
  43 #include <libxml++/libxml++.h>
  44 #include <iostream>
  45
  46 #include "i18n.h"
  47
  48 using std::string;
  49 using std::vector;
  50 using std::list;
  51 using std::cout;
  52 using std::pair;
  53 using std::make_pair;
  54 using std::max;
  55 using std::shared_ptr;
  56 using std::dynamic_pointer_cast;
  57 using boost::optional;
  58 using dcp::raw_convert;
  59 using namespace dcpomatic;
  60
  61 int const FFmpegContentProperty::SUBTITLE_STREAMS = 100;
  62 int const FFmpegContentProperty::SUBTITLE_STREAM = 101;
  63 int const FFmpegContentProperty::FILTERS = 102;
  64 int const FFmpegContentProperty::KDM = 103;
  65
  66 FFmpegContent::FFmpegContent (boost::filesystem::path p)
  67         : Content (p)
  68 {
  69
  70 }
  71
  72 template <class T>
  73 optional<T>
  74 get_optional_enum (cxml::ConstNodePtr node, string name)
  75 {
  76         optional<int> const v = node->optional_number_child<int>(name);
  77         if (!v) {
  78                 return optional<T>();
  79         }
  80         return static_cast<T>(*v);
  81 }
  82
  83 FFmpegContent::FFmpegContent (cxml::ConstNodePtr node, int version, list<string>& notes)
  84         : Content (node)
  85 {
  86         video = VideoContent::from_xml (this, node, version);
  87         audio = AudioContent::from_xml (this, node, version);
  88         text = TextContent::from_xml (this, node, version);
  89
  90         list<cxml::NodePtr> c = node->node_children ("SubtitleStream");
  91         for (list<cxml::NodePtr>::const_iterator i = c.begin(); i != c.end(); ++i) {
  92                 _subtitle_streams.push_back (shared_ptr<FFmpegSubtitleStream> (new FFmpegSubtitleStream (*i, version)));
  93                 if ((*i)->optional_number_child<int> ("Selected")) {
  94                         _subtitle_stream = _subtitle_streams.back ();
  95                 }
  96         }
  97
  98         c = node->node_children ("AudioStream");
  99         for (list<cxml::NodePtr>::const_iterator i = c.begin(); i != c.end(); ++i) {
 100                 shared_ptr<FFmpegAudioStream> as (new FFmpegAudioStream (*i, version));
 101                 audio->add_stream (as);
 102                 if (version < 11 && !(*i)->optional_node_child ("Selected")) {
 103                         /* This is an old file and this stream is not selected, so un-map it */
 104                         as->set_mapping (AudioMapping (as->channels (), MAX_DCP_AUDIO_CHANNELS));
 105                 }
 106         }
 107
 108         c = node->node_children ("Filter");
 109         for (list<cxml::NodePtr>::iterator i = c.begin(); i != c.end(); ++i) {
 110                 Filter const * f = Filter::from_id ((*i)->content ());
 111                 if (f) {
 112                         _filters.push_back (f);
 113                 } else {
 114                         notes.push_back (String::compose (_("DCP-o-matic no longer supports the `%1' filter, so it has been turned off."), (*i)->content()));
 115                 }
 116         }
 117
 118         optional<ContentTime::Type> const f = node->optional_number_child<ContentTime::Type> ("FirstVideo");
 119         if (f) {
 120                 _first_video = ContentTime (f.get ());
 121         }
 122
 123         _color_range = get_optional_enum<AVColorRange>(node, "ColorRange");
 124         _color_primaries = get_optional_enum<AVColorPrimaries>(node, "ColorPrimaries");
 125         _color_trc = get_optional_enum<AVColorTransferCharacteristic>(node, "ColorTransferCharacteristic");
 126         _colorspace = get_optional_enum<AVColorSpace>(node, "Colorspace");
 127         _bits_per_pixel = node->optional_number_child<int> ("BitsPerPixel");
 128 }
 129
 130 FFmpegContent::FFmpegContent (vector<shared_ptr<Content> > c)
 131         : Content (c)
 132 {
 133         vector<shared_ptr<Content> >::const_iterator i = c.begin ();
 134
 135         bool need_video = false;
 136         bool need_audio = false;
 137         bool need_text = false;
 138
 139         if (i != c.end ()) {
 140                 need_video = static_cast<bool> ((*i)->video);
 141                 need_audio = static_cast<bool> ((*i)->audio);
 142                 need_text = !(*i)->text.empty();
 143         }
 144
 145         while (i != c.end ()) {
 146                 if (need_video != static_cast<bool> ((*i)->video)) {
 147                         throw JoinError (_("Content to be joined must all have or not have video"));
 148                 }
 149                 if (need_audio != static_cast<bool> ((*i)->audio)) {
 150                         throw JoinError (_("Content to be joined must all have or not have audio"));
 151                 }
 152                 if (need_text != !(*i)->text.empty()) {
 153                         throw JoinError (_("Content to be joined must all have or not have subtitles or captions"));
 154                 }
 155                 ++i;
 156         }
 157
 158         if (need_video) {
 159                 video.reset (new VideoContent (this, c));
 160         }
 161         if (need_audio) {
 162                 audio.reset (new AudioContent (this, c));
 163         }
 164         if (need_text) {
 165                 text.push_back (shared_ptr<TextContent> (new TextContent (this, c)));
 166         }
 167
 168         shared_ptr<FFmpegContent> ref = dynamic_pointer_cast<FFmpegContent> (c[0]);
 169         DCPOMATIC_ASSERT (ref);
 170
 171         for (size_t i = 0; i < c.size(); ++i) {
 172                 shared_ptr<FFmpegContent> fc = dynamic_pointer_cast<FFmpegContent> (c[i]);
 173                 if (fc->only_text() && fc->only_text()->use() && *(fc->_subtitle_stream.get()) != *(ref->_subtitle_stream.get())) {
 174                         throw JoinError (_("Content to be joined must use the same subtitle stream."));
 175                 }
 176         }
 177
 178         /* XXX: should probably check that more of the stuff below is the same in *this and ref */
 179
 180         _subtitle_streams = ref->subtitle_streams ();
 181         _subtitle_stream = ref->subtitle_stream ();
 182         _first_video = ref->_first_video;
 183         _filters = ref->_filters;
 184         _color_range = ref->_color_range;
 185         _color_primaries = ref->_color_primaries;
 186         _color_trc = ref->_color_trc;
 187         _colorspace = ref->_colorspace;
 188         _bits_per_pixel = ref->_bits_per_pixel;
 189 }
 190
 191 void
 192 FFmpegContent::as_xml (xmlpp::Node* node, bool with_paths) const
 193 {
 194         node->add_child("Type")->add_child_text ("FFmpeg");
 195         Content::as_xml (node, with_paths);
 196
 197         if (video) {
 198                 video->as_xml (node);
 199         }
 200
 201         if (audio) {
 202                 audio->as_xml (node);
 203
 204                 for (auto i: audio->streams ()) {
 205                         shared_ptr<FFmpegAudioStream> f = dynamic_pointer_cast<FFmpegAudioStream> (i);
 206                         DCPOMATIC_ASSERT (f);
 207                         f->as_xml (node->add_child("AudioStream"));
 208                 }
 209         }
 210
 211         if (only_text()) {
 212                 only_text()->as_xml (node);
 213         }
 214
 215         boost::mutex::scoped_lock lm (_mutex);
 216
 217         for (vector<shared_ptr<FFmpegSubtitleStream> >::const_iterator i = _subtitle_streams.begin(); i != _subtitle_streams.end(); ++i) {
 218                 xmlpp::Node* t = node->add_child("SubtitleStream");
 219                 if (_subtitle_stream && *i == _subtitle_stream) {
 220                         t->add_child("Selected")->add_child_text("1");
 221                 }
 222                 (*i)->as_xml (t);
 223         }
 224
 225         for (vector<Filter const *>::const_iterator i = _filters.begin(); i != _filters.end(); ++i) {
 226                 node->add_child("Filter")->add_child_text ((*i)->id ());
 227         }
 228
 229         if (_first_video) {
 230                 node->add_child("FirstVideo")->add_child_text (raw_convert<string> (_first_video.get().get()));
 231         }
 232
 233         if (_color_range) {
 234                 node->add_child("ColorRange")->add_child_text (raw_convert<string> (static_cast<int> (*_color_range)));
 235         }
 236         if (_color_primaries) {
 237                 node->add_child("ColorPrimaries")->add_child_text (raw_convert<string> (static_cast<int> (*_color_primaries)));
 238         }
 239         if (_color_trc) {
 240                 node->add_child("ColorTransferCharacteristic")->add_child_text (raw_convert<string> (static_cast<int> (*_color_trc)));
 241         }
 242         if (_colorspace) {
 243                 node->add_child("Colorspace")->add_child_text (raw_convert<string> (static_cast<int> (*_colorspace)));
 244         }
 245         if (_bits_per_pixel) {
 246                 node->add_child("BitsPerPixel")->add_child_text (raw_convert<string> (*_bits_per_pixel));
 247         }
 248 }
 249
 250 void
 251 FFmpegContent::examine (shared_ptr<const Film> film, shared_ptr<Job> job)
 252 {
 253         ChangeSignaller<Content> cc1 (this, FFmpegContentProperty::SUBTITLE_STREAMS);
 254         ChangeSignaller<Content> cc2 (this, FFmpegContentProperty::SUBTITLE_STREAM);
 255
 256         if (job) {
 257                 job->set_progress_unknown ();
 258         }
 259
 260         Content::examine (film, job);
 261
 262         shared_ptr<FFmpegExaminer> examiner (new FFmpegExaminer (shared_from_this (), job));
 263
 264         if (examiner->has_video ()) {
 265                 video.reset (new VideoContent (this));
 266                 video->take_from_examiner (examiner);
 267         }
 268
 269         boost::filesystem::path first_path = path (0);
 270
 271         {
 272                 boost::mutex::scoped_lock lm (_mutex);
 273
 274                 if (examiner->has_video ()) {
 275                         _first_video = examiner->first_video ();
 276                         _color_range = examiner->color_range ();
 277                         _color_primaries = examiner->color_primaries ();
 278                         _color_trc = examiner->color_trc ();
 279                         _colorspace = examiner->colorspace ();
 280                         _bits_per_pixel = examiner->bits_per_pixel ();
 281
 282                         if (examiner->rotation()) {
 283                                 double rot = *examiner->rotation ();
 284                                 if (fabs (rot - 180) < 1.0) {
 285                                         _filters.push_back (Filter::from_id ("vflip"));
 286                                         _filters.push_back (Filter::from_id ("hflip"));
 287                                 } else if (fabs (rot - 90) < 1.0) {
 288                                         _filters.push_back (Filter::from_id ("90clock"));
 289                                 } else if (fabs (rot - 270) < 1.0) {
 290                                         _filters.push_back (Filter::from_id ("90anticlock"));
 291                                 }
 292                         }
 293                 }
 294
 295                 if (!examiner->audio_streams().empty ()) {
 296                         audio.reset (new AudioContent (this));
 297
 298                         for (auto i: examiner->audio_streams ()) {
 299                                 audio->add_stream (i);
 300                         }
 301
 302                         AudioStreamPtr as = audio->streams().front();
 303                         AudioMapping m = as->mapping ();
 304                         m.make_default (film ? film->audio_processor() : 0, first_path);
 305                         as->set_mapping (m);
 306                 }
 307
 308                 _subtitle_streams = examiner->subtitle_streams ();
 309                 if (!_subtitle_streams.empty ()) {
 310                         text.clear ();
 311                         text.push_back (shared_ptr<TextContent> (new TextContent (this, TEXT_OPEN_SUBTITLE, TEXT_UNKNOWN)));
 312                         _subtitle_stream = _subtitle_streams.front ();
 313                 }
 314         }
 315
 316         if (examiner->has_video ()) {
 317                 set_default_colour_conversion ();
 318         }
 319
 320         if (examiner->has_video() && examiner->pulldown() && video_frame_rate() && fabs(*video_frame_rate() - 29.97) < 0.001) {
 321                 /* FFmpeg has detected this file as 29.97 and the examiner thinks it is using "soft" 2:3 pulldown (telecine).
 322                  * This means we can treat it as a 23.976fps file.
 323                  */
 324                 set_video_frame_rate (24000.0 / 1001);
 325                 video->set_length (video->length() * 24.0 / 30);
 326         }
 327 }
 328
 329 string
 330 FFmpegContent::summary () const
 331 {
 332         if (video && audio) {
 333                 return String::compose (_("%1 [movie]"), path_summary ());
 334         } else if (video) {
 335                 return String::compose (_("%1 [video]"), path_summary ());
 336         } else if (audio) {
 337                 return String::compose (_("%1 [audio]"), path_summary ());
 338         }
 339
 340         return path_summary ();
 341 }
 342
 343 string
 344 FFmpegContent::technical_summary () const
 345 {
 346         string as = "";
 347         for (auto i: ffmpeg_audio_streams ()) {
 348                 as += i->technical_summary () + " " ;
 349         }
 350
 351         if (as.empty ()) {
 352                 as = "none";
 353         }
 354
 355         string ss = "none";
 356         if (_subtitle_stream) {
 357                 ss = _subtitle_stream->technical_summary ();
 358         }
 359
 360         string filt = Filter::ffmpeg_string (_filters);
 361
 362         string s = Content::technical_summary ();
 363
 364         if (video) {
 365                 s += " - " + video->technical_summary ();
 366         }
 367
 368         if (audio) {
 369                 s += " - " + audio->technical_summary ();
 370         }
 371
 372         return s + String::compose (
 373                 "ffmpeg: audio %1 subtitle %2 filters %3", as, ss, filt
 374                 );
 375 }
 376
 377 void
 378 FFmpegContent::set_subtitle_stream (shared_ptr<FFmpegSubtitleStream> s)
 379 {
 380         ChangeSignaller<Content> cc (this, FFmpegContentProperty::SUBTITLE_STREAM);
 381
 382         {
 383                 boost::mutex::scoped_lock lm (_mutex);
 384                 _subtitle_stream = s;
 385         }
 386 }
 387
 388 bool
 389 operator== (FFmpegStream const & a, FFmpegStream const & b)
 390 {
 391         return a._id == b._id;
 392 }
 393
 394 bool
 395 operator!= (FFmpegStream const & a, FFmpegStream const & b)
 396 {
 397         return a._id != b._id;
 398 }
 399
 400 DCPTime
 401 FFmpegContent::full_length (shared_ptr<const Film> film) const
 402 {
 403         FrameRateChange const frc (film, shared_from_this());
 404         if (video) {
 405                 return DCPTime::from_frames (llrint (video->length_after_3d_combine() * frc.factor()), film->video_frame_rate());
 406         }
 407
 408         if (audio) {
 409                 DCPTime longest;
 410                 for (auto i: audio->streams()) {
 411                         longest = max (longest, DCPTime::from_frames(llrint(i->length() / frc.speed_up), i->frame_rate()));
 412                 }
 413                 return longest;
 414         }
 415
 416         /* XXX: subtitle content? */
 417
 418         return DCPTime();
 419 }
 420
 421 DCPTime
 422 FFmpegContent::approximate_length () const
 423 {
 424         if (video) {
 425                 return DCPTime::from_frames (video->length_after_3d_combine(), 24);
 426         }
 427
 428         DCPOMATIC_ASSERT (audio);
 429
 430         Frame longest = 0;
 431         for (auto i: audio->streams()) {
 432                 longest = max (longest, Frame(llrint(i->length())));
 433         }
 434
 435         return DCPTime::from_frames (longest, 24);
 436 }
 437
 438 void
 439 FFmpegContent::set_filters (vector<Filter const *> const & filters)
 440 {
 441         ChangeSignaller<Content> cc (this, FFmpegContentProperty::FILTERS);
 442
 443         {
 444                 boost::mutex::scoped_lock lm (_mutex);
 445                 _filters = filters;
 446         }
 447 }
 448
 449 string
 450 FFmpegContent::identifier () const
 451 {
 452         string s = Content::identifier();
 453
 454         if (video) {
 455                 s += "_" + video->identifier();
 456         }
 457
 458         if (only_text() && only_text()->use() && only_text()->burn()) {
 459                 s += "_" + only_text()->identifier();
 460         }
 461
 462         boost::mutex::scoped_lock lm (_mutex);
 463
 464         if (_subtitle_stream) {
 465                 s += "_" + _subtitle_stream->identifier ();
 466         }
 467
 468         for (vector<Filter const *>::const_iterator i = _filters.begin(); i != _filters.end(); ++i) {
 469                 s += "_" + (*i)->id ();
 470         }
 471
 472         return s;
 473 }
 474
 475 void
 476 FFmpegContent::set_default_colour_conversion ()
 477 {
 478         DCPOMATIC_ASSERT (video);
 479
 480         dcp::Size const s = video->size ();
 481
 482         boost::mutex::scoped_lock lm (_mutex);
 483
 484         switch (_colorspace.get_value_or(AVCOL_SPC_UNSPECIFIED)) {
 485         case AVCOL_SPC_RGB:
 486                 video->set_colour_conversion (PresetColourConversion::from_id ("srgb").conversion);
 487                 break;
 488         case AVCOL_SPC_BT709:
 489                 video->set_colour_conversion (PresetColourConversion::from_id ("rec709").conversion);
 490                 break;
 491         case AVCOL_SPC_BT470BG:
 492         case AVCOL_SPC_SMPTE170M:
 493         case AVCOL_SPC_SMPTE240M:
 494                 video->set_colour_conversion (PresetColourConversion::from_id ("rec601").conversion);
 495                 break;
 496         case AVCOL_SPC_BT2020_CL:
 497         case AVCOL_SPC_BT2020_NCL:
 498                 video->set_colour_conversion (PresetColourConversion::from_id ("rec2020").conversion);
 499                 break;
 500         default:
 501                 if (s.width < 1080) {
 502                         video->set_colour_conversion (PresetColourConversion::from_id ("rec601").conversion);
 503                 } else {
 504                         video->set_colour_conversion (PresetColourConversion::from_id ("rec709").conversion);
 505                 }
 506                 break;
 507         }
 508 }
 509
 510 void
 511 FFmpegContent::add_properties (shared_ptr<const Film> film, list<UserProperty>& p) const
 512 {
 513         Content::add_properties (film, p);
 514
 515         if (video) {
 516                 video->add_properties (p);
 517
 518                 if (_bits_per_pixel) {
 519                         /* Assuming there's three components, so bits per pixel component is _bits_per_pixel / 3 */
 520                         int const lim_start = pow(2, _bits_per_pixel.get() / 3 - 4);
 521                         int const lim_end = 235 * pow(2, _bits_per_pixel.get() / 3 - 8);
 522                         int const total = pow(2, _bits_per_pixel.get() / 3);
 523
 524                         switch (_color_range.get_value_or(AVCOL_RANGE_UNSPECIFIED)) {
 525                         case AVCOL_RANGE_UNSPECIFIED:
 526                                 /// TRANSLATORS: this means that the range of pixel values used in this
 527                                 /// file is unknown (not specified in the file).
 528                                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour range"), _("Unspecified")));
 529                                 break;
 530                         case AVCOL_RANGE_MPEG:
 531                                 /// TRANSLATORS: this means that the range of pixel values used in this
 532                                 /// file is limited, so that not all possible values are valid.
 533                                 p.push_back (
 534                                         UserProperty (
 535                                                 UserProperty::VIDEO, _("Colour range"), String::compose(_("Limited (%1-%2)"), lim_start, lim_end)
 536                                                 )
 537                                         );
 538                                 break;
 539                         case AVCOL_RANGE_JPEG:
 540                                 /// TRANSLATORS: this means that the range of pixel values used in this
 541                                 /// file is full, so that all possible pixel values are valid.
 542                                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour range"), String::compose (_("Full (0-%1)"), total)));
 543                                 break;
 544                         default:
 545                                 DCPOMATIC_ASSERT (false);
 546                         }
 547                 } else {
 548                         switch (_color_range.get_value_or(AVCOL_RANGE_UNSPECIFIED)) {
 549                         case AVCOL_RANGE_UNSPECIFIED:
 550                                 /// TRANSLATORS: this means that the range of pixel values used in this
 551                                 /// file is unknown (not specified in the file).
 552                                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour range"), _("Unspecified")));
 553                                 break;
 554                         case AVCOL_RANGE_MPEG:
 555                                 /// TRANSLATORS: this means that the range of pixel values used in this
 556                                 /// file is limited, so that not all possible values are valid.
 557                                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour range"), _("Limited")));
 558                                 break;
 559                         case AVCOL_RANGE_JPEG:
 560                                 /// TRANSLATORS: this means that the range of pixel values used in this
 561                                 /// file is full, so that all possible pixel values are valid.
 562                                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour range"), _("Full")));
 563                                 break;
 564                         default:
 565                                 DCPOMATIC_ASSERT (false);
 566                         }
 567                 }
 568
 569                 char const * primaries[] = {
 570                         _("Unspecified"),
 571                         _("BT709"),
 572                         _("Unspecified"),
 573                         _("Unspecified"),
 574                         _("BT470M"),
 575                         _("BT470BG"),
 576                         _("SMPTE 170M (BT601)"),
 577                         _("SMPTE 240M"),
 578                         _("Film"),
 579                         _("BT2020"),
 580                         _("SMPTE ST 428-1 (CIE 1931 XYZ)"),
 581                         _("SMPTE ST 431-2 (2011)"),
 582                         _("SMPTE ST 432-1 D65 (2010)"), // 12
 583                         "", // 13
 584                         "", // 14
 585                         "", // 15
 586                         "", // 16
 587                         "", // 17
 588                         "", // 18
 589                         "", // 19
 590                         "", // 20
 591                         "", // 21
 592                         _("JEDEC P22")
 593                 };
 594
 595                 DCPOMATIC_ASSERT (AVCOL_PRI_NB <= 23);
 596                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour primaries"), primaries[_color_primaries.get_value_or(AVCOL_PRI_UNSPECIFIED)]));
 597
 598                 char const * transfers[] = {
 599                         _("Unspecified"),
 600                         _("BT709"),
 601                         _("Unspecified"),
 602                         _("Unspecified"),
 603                         _("Gamma 22 (BT470M)"),
 604                         _("Gamma 28 (BT470BG)"),
 605                         _("SMPTE 170M (BT601)"),
 606                         _("SMPTE 240M"),
 607                         _("Linear"),
 608                         _("Logarithmic (100:1 range)"),
 609                         _("Logarithmic (316:1 range)"),
 610                         _("IEC61966-2-4"),
 611                         _("BT1361 extended colour gamut"),
 612                         _("IEC61966-2-1 (sRGB or sYCC)"),
 613                         _("BT2020 for a 10-bit system"),
 614                         _("BT2020 for a 12-bit system"),
 615                         _("SMPTE ST 2084 for 10, 12, 14 and 16 bit systems"),
 616                         _("SMPTE ST 428-1"),
 617                         _("ARIB STD-B67 ('Hybrid log-gamma')")
 618                 };
 619
 620                 DCPOMATIC_ASSERT (AVCOL_TRC_NB <= 19);
 621                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour transfer characteristic"), transfers[_color_trc.get_value_or(AVCOL_TRC_UNSPECIFIED)]));
 622
 623                 char const * spaces[] = {
 624                         _("RGB / sRGB (IEC61966-2-1)"),
 625                         _("BT709"),
 626                         _("Unspecified"),
 627                         _("Unspecified"),
 628                         _("FCC"),
 629                         _("BT470BG (BT601-6)"),
 630                         _("SMPTE 170M (BT601-6)"),
 631                         _("SMPTE 240M"),
 632                         _("YCOCG"),
 633                         _("BT2020 non-constant luminance"),
 634                         _("BT2020 constant luminance"),
 635                         _("SMPTE 2085, Y'D'zD'x"),
 636                         _("Chroma-derived non-constant luminance"),
 637                         _("Chroma-derived constant luminance"),
 638                         _("BT2100")
 639                 };
 640
 641                 DCPOMATIC_ASSERT (AVCOL_SPC_NB == 15);
 642                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colourspace"), spaces[_colorspace.get_value_or(AVCOL_SPC_UNSPECIFIED)]));
 643
 644                 if (_bits_per_pixel) {
 645                         p.push_back (UserProperty (UserProperty::VIDEO, _("Bits per pixel"), *_bits_per_pixel));
 646                 }
 647         }
 648
 649         if (audio) {
 650                 audio->add_properties (film, p);
 651         }
 652 }
 653
 654 /** Our subtitle streams have colour maps, which can be changed, but
 655  *  they have no way of signalling that change.  As a hack, we have this
 656  *  method which callers can use when they've modified one of our subtitle
 657  *  streams.
 658  */
 659 void
 660 FFmpegContent::signal_subtitle_stream_changed ()
 661 {
 662         /* XXX: this is too late; really it should be before the change */
 663         ChangeSignaller<Content> cc (this, FFmpegContentProperty::SUBTITLE_STREAM);
 664 }
 665
 666 vector<shared_ptr<FFmpegAudioStream> >
 667 FFmpegContent::ffmpeg_audio_streams () const
 668 {
 669         vector<shared_ptr<FFmpegAudioStream> > fa;
 670
 671         if (audio) {
 672                 for (auto i: audio->streams()) {
 673                         fa.push_back (dynamic_pointer_cast<FFmpegAudioStream> (i));
 674                 }
 675         }
 676
 677         return fa;
 678 }
 679
 680 void
 681 FFmpegContent::take_settings_from (shared_ptr<const Content> c)
 682 {
 683         shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (c);
 684         if (!fc) {
 685                 return;
 686                 }
 687
 688         Content::take_settings_from (c);
 689         _filters = fc->_filters;
 690 }
 691