src/lib/ffmpeg_content.cc

   1 /*
   2     Copyright (C) 2013-2021 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::make_shared;
  56 using std::shared_ptr;
  57 using std::dynamic_pointer_cast;
  58 using boost::optional;
  59 using dcp::raw_convert;
  60 using namespace dcpomatic;
  61
  62 int const FFmpegContentProperty::SUBTITLE_STREAMS = 100;
  63 int const FFmpegContentProperty::SUBTITLE_STREAM = 101;
  64 int const FFmpegContentProperty::FILTERS = 102;
  65 int const FFmpegContentProperty::KDM = 103;
  66
  67 FFmpegContent::FFmpegContent (boost::filesystem::path p)
  68         : Content (p)
  69 {
  70
  71 }
  72
  73 template <class T>
  74 optional<T>
  75 get_optional_enum (cxml::ConstNodePtr node, string name)
  76 {
  77         auto const v = node->optional_number_child<int>(name);
  78         if (!v) {
  79                 return optional<T>();
  80         }
  81         return static_cast<T>(*v);
  82 }
  83
  84 FFmpegContent::FFmpegContent (cxml::ConstNodePtr node, int version, list<string>& notes)
  85         : Content (node)
  86 {
  87         video = VideoContent::from_xml (this, node, version);
  88         audio = AudioContent::from_xml (this, node, version);
  89         text = TextContent::from_xml (this, node, version);
  90
  91         for (auto i: node->node_children("SubtitleStream")) {
  92                 _subtitle_streams.push_back (make_shared<FFmpegSubtitleStream>(i, version));
  93                 if (i->optional_number_child<int>("Selected")) {
  94                         _subtitle_stream = _subtitle_streams.back ();
  95                 }
  96         }
  97
  98         for (auto i: node->node_children("AudioStream")) {
  99                 auto as = make_shared<FFmpegAudioStream>(i, version);
 100                 audio->add_stream (as);
 101                 if (version < 11 && !i->optional_node_child ("Selected")) {
 102                         /* This is an old file and this stream is not selected, so un-map it */
 103                         as->set_mapping (AudioMapping (as->channels (), MAX_DCP_AUDIO_CHANNELS));
 104                 }
 105         }
 106
 107         for (auto i: node->node_children("Filter")) {
 108                 Filter const * f = Filter::from_id(i->content());
 109                 if (f) {
 110                         _filters.push_back (f);
 111                 } else {
 112                         notes.push_back (String::compose (_("DCP-o-matic no longer supports the `%1' filter, so it has been turned off."), i->content()));
 113                 }
 114         }
 115
 116         auto const f = node->optional_number_child<ContentTime::Type> ("FirstVideo");
 117         if (f) {
 118                 _first_video = ContentTime (f.get ());
 119         }
 120
 121         _color_range = get_optional_enum<AVColorRange>(node, "ColorRange");
 122         _color_primaries = get_optional_enum<AVColorPrimaries>(node, "ColorPrimaries");
 123         _color_trc = get_optional_enum<AVColorTransferCharacteristic>(node, "ColorTransferCharacteristic");
 124         _colorspace = get_optional_enum<AVColorSpace>(node, "Colorspace");
 125         _bits_per_pixel = node->optional_number_child<int> ("BitsPerPixel");
 126 }
 127
 128 FFmpegContent::FFmpegContent (vector<shared_ptr<Content> > c)
 129         : Content (c)
 130 {
 131         auto i = c.begin ();
 132
 133         bool need_video = false;
 134         bool need_audio = false;
 135         bool need_text = false;
 136
 137         if (i != c.end ()) {
 138                 need_video = static_cast<bool> ((*i)->video);
 139                 need_audio = static_cast<bool> ((*i)->audio);
 140                 need_text = !(*i)->text.empty();
 141         }
 142
 143         while (i != c.end ()) {
 144                 if (need_video != static_cast<bool> ((*i)->video)) {
 145                         throw JoinError (_("Content to be joined must all have or not have video"));
 146                 }
 147                 if (need_audio != static_cast<bool> ((*i)->audio)) {
 148                         throw JoinError (_("Content to be joined must all have or not have audio"));
 149                 }
 150                 if (need_text != !(*i)->text.empty()) {
 151                         throw JoinError (_("Content to be joined must all have or not have subtitles or captions"));
 152                 }
 153                 ++i;
 154         }
 155
 156         if (need_video) {
 157                 video = make_shared<VideoContent>(this, c);
 158         }
 159         if (need_audio) {
 160                 audio = make_shared<AudioContent>(this, c);
 161         }
 162         if (need_text) {
 163                 text.push_back (make_shared<TextContent>(this, c));
 164         }
 165
 166         auto ref = dynamic_pointer_cast<FFmpegContent> (c[0]);
 167         DCPOMATIC_ASSERT (ref);
 168
 169         for (size_t i = 0; i < c.size(); ++i) {
 170                 auto fc = dynamic_pointer_cast<FFmpegContent>(c[i]);
 171                 if (fc->only_text() && fc->only_text()->use() && *(fc->_subtitle_stream.get()) != *(ref->_subtitle_stream.get())) {
 172                         throw JoinError (_("Content to be joined must use the same subtitle stream."));
 173                 }
 174         }
 175
 176         /* XXX: should probably check that more of the stuff below is the same in *this and ref */
 177
 178         _subtitle_streams = ref->subtitle_streams ();
 179         _subtitle_stream = ref->subtitle_stream ();
 180         _first_video = ref->_first_video;
 181         _filters = ref->_filters;
 182         _color_range = ref->_color_range;
 183         _color_primaries = ref->_color_primaries;
 184         _color_trc = ref->_color_trc;
 185         _colorspace = ref->_colorspace;
 186         _bits_per_pixel = ref->_bits_per_pixel;
 187 }
 188
 189 void
 190 FFmpegContent::as_xml (xmlpp::Node* node, bool with_paths) const
 191 {
 192         node->add_child("Type")->add_child_text ("FFmpeg");
 193         Content::as_xml (node, with_paths);
 194
 195         if (video) {
 196                 video->as_xml (node);
 197         }
 198
 199         if (audio) {
 200                 audio->as_xml (node);
 201
 202                 for (auto i: audio->streams ()) {
 203                         auto f = dynamic_pointer_cast<FFmpegAudioStream> (i);
 204                         DCPOMATIC_ASSERT (f);
 205                         f->as_xml (node->add_child("AudioStream"));
 206                 }
 207         }
 208
 209         if (only_text()) {
 210                 only_text()->as_xml (node);
 211         }
 212
 213         boost::mutex::scoped_lock lm (_mutex);
 214
 215         for (auto i: _subtitle_streams) {
 216                 auto t = node->add_child("SubtitleStream");
 217                 if (_subtitle_stream && i == _subtitle_stream) {
 218                         t->add_child("Selected")->add_child_text("1");
 219                 }
 220                 i->as_xml (t);
 221         }
 222
 223         for (auto i: _filters) {
 224                 node->add_child("Filter")->add_child_text(i->id());
 225         }
 226
 227         if (_first_video) {
 228                 node->add_child("FirstVideo")->add_child_text (raw_convert<string> (_first_video.get().get()));
 229         }
 230
 231         if (_color_range) {
 232                 node->add_child("ColorRange")->add_child_text (raw_convert<string> (static_cast<int> (*_color_range)));
 233         }
 234         if (_color_primaries) {
 235                 node->add_child("ColorPrimaries")->add_child_text (raw_convert<string> (static_cast<int> (*_color_primaries)));
 236         }
 237         if (_color_trc) {
 238                 node->add_child("ColorTransferCharacteristic")->add_child_text (raw_convert<string> (static_cast<int> (*_color_trc)));
 239         }
 240         if (_colorspace) {
 241                 node->add_child("Colorspace")->add_child_text (raw_convert<string> (static_cast<int> (*_colorspace)));
 242         }
 243         if (_bits_per_pixel) {
 244                 node->add_child("BitsPerPixel")->add_child_text (raw_convert<string> (*_bits_per_pixel));
 245         }
 246 }
 247
 248 void
 249 FFmpegContent::examine (shared_ptr<const Film> film, shared_ptr<Job> job)
 250 {
 251         ChangeSignaller<Content> cc1 (this, FFmpegContentProperty::SUBTITLE_STREAMS);
 252         ChangeSignaller<Content> cc2 (this, FFmpegContentProperty::SUBTITLE_STREAM);
 253
 254         if (job) {
 255                 job->set_progress_unknown ();
 256         }
 257
 258         Content::examine (film, job);
 259
 260         auto examiner = make_shared<FFmpegExaminer>(shared_from_this (), job);
 261
 262         if (examiner->has_video ()) {
 263                 video.reset (new VideoContent (this));
 264                 video->take_from_examiner (examiner);
 265         }
 266
 267         auto first_path = path (0);
 268
 269         {
 270                 boost::mutex::scoped_lock lm (_mutex);
 271
 272                 if (examiner->has_video ()) {
 273                         _first_video = examiner->first_video ();
 274                         _color_range = examiner->color_range ();
 275                         _color_primaries = examiner->color_primaries ();
 276                         _color_trc = examiner->color_trc ();
 277                         _colorspace = examiner->colorspace ();
 278                         _bits_per_pixel = examiner->bits_per_pixel ();
 279
 280                         if (examiner->rotation()) {
 281                                 auto rot = *examiner->rotation ();
 282                                 if (fabs (rot - 180) < 1.0) {
 283                                         _filters.push_back (Filter::from_id ("vflip"));
 284                                         _filters.push_back (Filter::from_id ("hflip"));
 285                                 } else if (fabs (rot - 90) < 1.0) {
 286                                         _filters.push_back (Filter::from_id ("90clock"));
 287                                 } else if (fabs (rot - 270) < 1.0) {
 288                                         _filters.push_back (Filter::from_id ("90anticlock"));
 289                                 }
 290                         }
 291                 }
 292
 293                 if (!examiner->audio_streams().empty ()) {
 294                         audio = make_shared<AudioContent>(this);
 295
 296                         for (auto i: examiner->audio_streams()) {
 297                                 audio->add_stream (i);
 298                         }
 299
 300                         auto as = audio->streams().front();
 301                         auto m = as->mapping ();
 302                         m.make_default (film ? film->audio_processor() : 0, first_path);
 303                         as->set_mapping (m);
 304                 }
 305
 306                 _subtitle_streams = examiner->subtitle_streams ();
 307                 if (!_subtitle_streams.empty ()) {
 308                         text.clear ();
 309                         text.push_back (make_shared<TextContent>(this, TEXT_OPEN_SUBTITLE, TEXT_UNKNOWN));
 310                         _subtitle_stream = _subtitle_streams.front ();
 311                 }
 312         }
 313
 314         if (examiner->has_video ()) {
 315                 set_default_colour_conversion ();
 316         }
 317
 318         if (examiner->has_video() && examiner->pulldown() && video_frame_rate() && fabs(*video_frame_rate() - 29.97) < 0.001) {
 319                 /* FFmpeg has detected this file as 29.97 and the examiner thinks it is using "soft" 2:3 pulldown (telecine).
 320                  * This means we can treat it as a 23.976fps file.
 321                  */
 322                 set_video_frame_rate (24000.0 / 1001);
 323                 video->set_length (video->length() * 24.0 / 30);
 324         }
 325 }
 326
 327 string
 328 FFmpegContent::summary () const
 329 {
 330         if (video && audio) {
 331                 return String::compose (_("%1 [movie]"), path_summary ());
 332         } else if (video) {
 333                 return String::compose (_("%1 [video]"), path_summary ());
 334         } else if (audio) {
 335                 return String::compose (_("%1 [audio]"), path_summary ());
 336         }
 337
 338         return path_summary ();
 339 }
 340
 341 string
 342 FFmpegContent::technical_summary () const
 343 {
 344         string as = "";
 345         for (auto i: ffmpeg_audio_streams ()) {
 346                 as += i->technical_summary () + " " ;
 347         }
 348
 349         if (as.empty ()) {
 350                 as = "none";
 351         }
 352
 353         string ss = "none";
 354         if (_subtitle_stream) {
 355                 ss = _subtitle_stream->technical_summary ();
 356         }
 357
 358         auto filt = Filter::ffmpeg_string (_filters);
 359
 360         auto s = Content::technical_summary ();
 361
 362         if (video) {
 363                 s += " - " + video->technical_summary ();
 364         }
 365
 366         if (audio) {
 367                 s += " - " + audio->technical_summary ();
 368         }
 369
 370         return s + String::compose (
 371                 "ffmpeg: audio %1 subtitle %2 filters %3", as, ss, filt
 372                 );
 373 }
 374
 375 void
 376 FFmpegContent::set_subtitle_stream (shared_ptr<FFmpegSubtitleStream> s)
 377 {
 378         ChangeSignaller<Content> cc (this, FFmpegContentProperty::SUBTITLE_STREAM);
 379
 380         {
 381                 boost::mutex::scoped_lock lm (_mutex);
 382                 _subtitle_stream = s;
 383         }
 384 }
 385
 386 bool
 387 operator== (FFmpegStream const & a, FFmpegStream const & b)
 388 {
 389         return a._id == b._id;
 390 }
 391
 392 bool
 393 operator!= (FFmpegStream const & a, FFmpegStream const & b)
 394 {
 395         return a._id != b._id;
 396 }
 397
 398 DCPTime
 399 FFmpegContent::full_length (shared_ptr<const Film> film) const
 400 {
 401         FrameRateChange const frc (film, shared_from_this());
 402         if (video) {
 403                 return DCPTime::from_frames (llrint (video->length_after_3d_combine() * frc.factor()), film->video_frame_rate());
 404         }
 405
 406         if (audio) {
 407                 DCPTime longest;
 408                 for (auto i: audio->streams()) {
 409                         longest = max (longest, DCPTime::from_frames(llrint(i->length() / frc.speed_up), i->frame_rate()));
 410                 }
 411                 return longest;
 412         }
 413
 414         /* XXX: subtitle content? */
 415
 416         return DCPTime();
 417 }
 418
 419 DCPTime
 420 FFmpegContent::approximate_length () const
 421 {
 422         if (video) {
 423                 return DCPTime::from_frames (video->length_after_3d_combine(), 24);
 424         }
 425
 426         DCPOMATIC_ASSERT (audio);
 427
 428         Frame longest = 0;
 429         for (auto i: audio->streams()) {
 430                 longest = max (longest, Frame(llrint(i->length())));
 431         }
 432
 433         return DCPTime::from_frames (longest, 24);
 434 }
 435
 436 void
 437 FFmpegContent::set_filters (vector<Filter const *> const & filters)
 438 {
 439         ChangeSignaller<Content> cc (this, FFmpegContentProperty::FILTERS);
 440
 441         {
 442                 boost::mutex::scoped_lock lm (_mutex);
 443                 _filters = filters;
 444         }
 445 }
 446
 447 string
 448 FFmpegContent::identifier () const
 449 {
 450         string s = Content::identifier();
 451
 452         if (video) {
 453                 s += "_" + video->identifier();
 454         }
 455
 456         if (only_text() && only_text()->use() && only_text()->burn()) {
 457                 s += "_" + only_text()->identifier();
 458         }
 459
 460         boost::mutex::scoped_lock lm (_mutex);
 461
 462         if (_subtitle_stream) {
 463                 s += "_" + _subtitle_stream->identifier ();
 464         }
 465
 466         for (auto i: _filters) {
 467                 s += "_" + i->id();
 468         }
 469
 470         return s;
 471 }
 472
 473 void
 474 FFmpegContent::set_default_colour_conversion ()
 475 {
 476         DCPOMATIC_ASSERT (video);
 477
 478         auto const s = video->size ();
 479
 480         boost::mutex::scoped_lock lm (_mutex);
 481
 482         switch (_colorspace.get_value_or(AVCOL_SPC_UNSPECIFIED)) {
 483         case AVCOL_SPC_RGB:
 484                 video->set_colour_conversion (PresetColourConversion::from_id ("srgb").conversion);
 485                 break;
 486         case AVCOL_SPC_BT709:
 487                 video->set_colour_conversion (PresetColourConversion::from_id ("rec709").conversion);
 488                 break;
 489         case AVCOL_SPC_BT470BG:
 490         case AVCOL_SPC_SMPTE170M:
 491         case AVCOL_SPC_SMPTE240M:
 492                 video->set_colour_conversion (PresetColourConversion::from_id ("rec601").conversion);
 493                 break;
 494         case AVCOL_SPC_BT2020_CL:
 495         case AVCOL_SPC_BT2020_NCL:
 496                 video->set_colour_conversion (PresetColourConversion::from_id ("rec2020").conversion);
 497                 break;
 498         default:
 499                 if (s.width < 1080) {
 500                         video->set_colour_conversion (PresetColourConversion::from_id ("rec601").conversion);
 501                 } else {
 502                         video->set_colour_conversion (PresetColourConversion::from_id ("rec709").conversion);
 503                 }
 504                 break;
 505         }
 506 }
 507
 508 void
 509 FFmpegContent::add_properties (shared_ptr<const Film> film, list<UserProperty>& p) const
 510 {
 511         Content::add_properties (film, p);
 512
 513         if (video) {
 514                 video->add_properties (p);
 515
 516                 if (_bits_per_pixel) {
 517                         /* Assuming there's three components, so bits per pixel component is _bits_per_pixel / 3 */
 518                         int const lim_start = pow(2, _bits_per_pixel.get() / 3 - 4);
 519                         int const lim_end = 235 * pow(2, _bits_per_pixel.get() / 3 - 8);
 520                         int const total = pow(2, _bits_per_pixel.get() / 3);
 521
 522                         switch (_color_range.get_value_or(AVCOL_RANGE_UNSPECIFIED)) {
 523                         case AVCOL_RANGE_UNSPECIFIED:
 524                                 /// TRANSLATORS: this means that the range of pixel values used in this
 525                                 /// file is unknown (not specified in the file).
 526                                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour range"), _("Unspecified")));
 527                                 break;
 528                         case AVCOL_RANGE_MPEG:
 529                                 /// TRANSLATORS: this means that the range of pixel values used in this
 530                                 /// file is limited, so that not all possible values are valid.
 531                                 p.push_back (
 532                                         UserProperty (
 533                                                 UserProperty::VIDEO, _("Colour range"), String::compose(_("Limited (%1-%2)"), lim_start, lim_end)
 534                                                 )
 535                                         );
 536                                 break;
 537                         case AVCOL_RANGE_JPEG:
 538                                 /// TRANSLATORS: this means that the range of pixel values used in this
 539                                 /// file is full, so that all possible pixel values are valid.
 540                                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour range"), String::compose (_("Full (0-%1)"), total)));
 541                                 break;
 542                         default:
 543                                 DCPOMATIC_ASSERT (false);
 544                         }
 545                 } else {
 546                         switch (_color_range.get_value_or(AVCOL_RANGE_UNSPECIFIED)) {
 547                         case AVCOL_RANGE_UNSPECIFIED:
 548                                 /// TRANSLATORS: this means that the range of pixel values used in this
 549                                 /// file is unknown (not specified in the file).
 550                                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour range"), _("Unspecified")));
 551                                 break;
 552                         case AVCOL_RANGE_MPEG:
 553                                 /// TRANSLATORS: this means that the range of pixel values used in this
 554                                 /// file is limited, so that not all possible values are valid.
 555                                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour range"), _("Limited")));
 556                                 break;
 557                         case AVCOL_RANGE_JPEG:
 558                                 /// TRANSLATORS: this means that the range of pixel values used in this
 559                                 /// file is full, so that all possible pixel values are valid.
 560                                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour range"), _("Full")));
 561                                 break;
 562                         default:
 563                                 DCPOMATIC_ASSERT (false);
 564                         }
 565                 }
 566
 567                 char const * primaries[] = {
 568                         _("Unspecified"),
 569                         _("BT709"),
 570                         _("Unspecified"),
 571                         _("Unspecified"),
 572                         _("BT470M"),
 573                         _("BT470BG"),
 574                         _("SMPTE 170M (BT601)"),
 575                         _("SMPTE 240M"),
 576                         _("Film"),
 577                         _("BT2020"),
 578                         _("SMPTE ST 428-1 (CIE 1931 XYZ)"),
 579                         _("SMPTE ST 431-2 (2011)"),
 580                         _("SMPTE ST 432-1 D65 (2010)"), // 12
 581                         "", // 13
 582                         "", // 14
 583                         "", // 15
 584                         "", // 16
 585                         "", // 17
 586                         "", // 18
 587                         "", // 19
 588                         "", // 20
 589                         "", // 21
 590                         _("JEDEC P22")
 591                 };
 592
 593                 DCPOMATIC_ASSERT (AVCOL_PRI_NB <= 23);
 594                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour primaries"), primaries[_color_primaries.get_value_or(AVCOL_PRI_UNSPECIFIED)]));
 595
 596                 char const * transfers[] = {
 597                         _("Unspecified"),
 598                         _("BT709"),
 599                         _("Unspecified"),
 600                         _("Unspecified"),
 601                         _("Gamma 22 (BT470M)"),
 602                         _("Gamma 28 (BT470BG)"),
 603                         _("SMPTE 170M (BT601)"),
 604                         _("SMPTE 240M"),
 605                         _("Linear"),
 606                         _("Logarithmic (100:1 range)"),
 607                         _("Logarithmic (316:1 range)"),
 608                         _("IEC61966-2-4"),
 609                         _("BT1361 extended colour gamut"),
 610                         _("IEC61966-2-1 (sRGB or sYCC)"),
 611                         _("BT2020 for a 10-bit system"),
 612                         _("BT2020 for a 12-bit system"),
 613                         _("SMPTE ST 2084 for 10, 12, 14 and 16 bit systems"),
 614                         _("SMPTE ST 428-1"),
 615                         _("ARIB STD-B67 ('Hybrid log-gamma')")
 616                 };
 617
 618                 DCPOMATIC_ASSERT (AVCOL_TRC_NB <= 19);
 619                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colour transfer characteristic"), transfers[_color_trc.get_value_or(AVCOL_TRC_UNSPECIFIED)]));
 620
 621                 char const * spaces[] = {
 622                         _("RGB / sRGB (IEC61966-2-1)"),
 623                         _("BT709"),
 624                         _("Unspecified"),
 625                         _("Unspecified"),
 626                         _("FCC"),
 627                         _("BT470BG (BT601-6)"),
 628                         _("SMPTE 170M (BT601-6)"),
 629                         _("SMPTE 240M"),
 630                         _("YCOCG"),
 631                         _("BT2020 non-constant luminance"),
 632                         _("BT2020 constant luminance"),
 633                         _("SMPTE 2085, Y'D'zD'x"),
 634                         _("Chroma-derived non-constant luminance"),
 635                         _("Chroma-derived constant luminance"),
 636                         _("BT2100")
 637                 };
 638
 639                 DCPOMATIC_ASSERT (AVCOL_SPC_NB == 15);
 640                 p.push_back (UserProperty (UserProperty::VIDEO, _("Colourspace"), spaces[_colorspace.get_value_or(AVCOL_SPC_UNSPECIFIED)]));
 641
 642                 if (_bits_per_pixel) {
 643                         p.push_back (UserProperty (UserProperty::VIDEO, _("Bits per pixel"), *_bits_per_pixel));
 644                 }
 645         }
 646
 647         if (audio) {
 648                 audio->add_properties (film, p);
 649         }
 650 }
 651
 652 /** Our subtitle streams have colour maps, which can be changed, but
 653  *  they have no way of signalling that change.  As a hack, we have this
 654  *  method which callers can use when they've modified one of our subtitle
 655  *  streams.
 656  */
 657 void
 658 FFmpegContent::signal_subtitle_stream_changed ()
 659 {
 660         /* XXX: this is too late; really it should be before the change */
 661         ChangeSignaller<Content> cc (this, FFmpegContentProperty::SUBTITLE_STREAM);
 662 }
 663
 664 vector<shared_ptr<FFmpegAudioStream> >
 665 FFmpegContent::ffmpeg_audio_streams () const
 666 {
 667         vector<shared_ptr<FFmpegAudioStream> > fa;
 668
 669         if (audio) {
 670                 for (auto i: audio->streams()) {
 671                         fa.push_back (dynamic_pointer_cast<FFmpegAudioStream> (i));
 672                 }
 673         }
 674
 675         return fa;
 676 }
 677
 678 void
 679 FFmpegContent::take_settings_from (shared_ptr<const Content> c)
 680 {
 681         auto fc = dynamic_pointer_cast<const FFmpegContent> (c);
 682         if (!fc) {
 683                 return;
 684                 }
 685
 686         Content::take_settings_from (c);
 687         _filters = fc->_filters;
 688 }
 689