src/lib/dcp_content.cc

   1 /*
   2     Copyright (C) 2014-2020 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 "atmos_content.h"
  22 #include "dcp_content.h"
  23 #include "video_content.h"
  24 #include "audio_content.h"
  25 #include "dcp_examiner.h"
  26 #include "job.h"
  27 #include "film.h"
  28 #include "config.h"
  29 #include "overlaps.h"
  30 #include "compose.hpp"
  31 #include "dcp_decoder.h"
  32 #include "log.h"
  33 #include "dcpomatic_log.h"
  34 #include "text_content.h"
  35 #include <dcp/dcp.h>
  36 #include <dcp/raw_convert.h>
  37 #include <dcp/exceptions.h>
  38 #include <dcp/reel_closed_caption_asset.h>
  39 #include <dcp/reel_picture_asset.h>
  40 #include <dcp/reel_subtitle_asset.h>
  41 #include <dcp/reel.h>
  42 #include <libxml++/libxml++.h>
  43 #include <iterator>
  44 #include <iostream>
  45
  46 #include "i18n.h"
  47
  48 using std::cout;
  49 using std::distance;
  50 using std::list;
  51 using std::make_shared;
  52 using std::map;
  53 using std::pair;
  54 using std::shared_ptr;
  55 using std::string;
  56 using std::vector;
  57 using boost::scoped_ptr;
  58 using boost::optional;
  59 using boost::function;
  60 using std::dynamic_pointer_cast;
  61 #if BOOST_VERSION >= 106100
  62 using namespace boost::placeholders;
  63 #endif
  64 using dcp::raw_convert;
  65 using namespace dcpomatic;
  66
  67 int const DCPContentProperty::NEEDS_ASSETS       = 600;
  68 int const DCPContentProperty::NEEDS_KDM          = 601;
  69 int const DCPContentProperty::REFERENCE_VIDEO    = 602;
  70 int const DCPContentProperty::REFERENCE_AUDIO    = 603;
  71 int const DCPContentProperty::REFERENCE_TEXT     = 604;
  72 int const DCPContentProperty::NAME               = 605;
  73 int const DCPContentProperty::TEXTS              = 606;
  74 int const DCPContentProperty::CPL                = 607;
  75
  76 DCPContent::DCPContent (boost::filesystem::path p)
  77         : _encrypted (false)
  78         , _needs_assets (false)
  79         , _kdm_valid (false)
  80         , _reference_video (false)
  81         , _reference_audio (false)
  82         , _three_d (false)
  83 {
  84         LOG_GENERAL ("Creating DCP content from %1", p.string());
  85
  86         read_directory (p);
  87         set_default_colour_conversion ();
  88
  89         for (int i = 0; i < static_cast<int>(TextType::COUNT); ++i) {
  90                 _reference_text[i] = false;
  91         }
  92 }
  93
  94 DCPContent::DCPContent (cxml::ConstNodePtr node, int version)
  95         : Content (node)
  96 {
  97         video = VideoContent::from_xml (this, node, version);
  98         audio = AudioContent::from_xml (this, node, version);
  99         text = TextContent::from_xml (this, node, version);
 100         atmos = AtmosContent::from_xml (this, node);
 101
 102         for (int i = 0; i < static_cast<int>(TextType::COUNT); ++i) {
 103                 _reference_text[i] = false;
 104         }
 105
 106         if (video && audio) {
 107                 audio->set_stream (
 108                         make_shared<AudioStream> (
 109                                 node->number_child<int> ("AudioFrameRate"),
 110                                 /* AudioLength was not present in some old metadata versions */
 111                                 node->optional_number_child<Frame>("AudioLength").get_value_or (
 112                                         video->length() * node->number_child<int>("AudioFrameRate") / video_frame_rate().get()
 113                                         ),
 114                                 AudioMapping (node->node_child ("AudioMapping"), version)
 115                                 )
 116                         );
 117         }
 118
 119         _name = node->string_child ("Name");
 120         _encrypted = node->bool_child ("Encrypted");
 121         _needs_assets = node->optional_bool_child("NeedsAssets").get_value_or (false);
 122         if (node->optional_node_child ("KDM")) {
 123                 _kdm = dcp::EncryptedKDM (node->string_child ("KDM"));
 124         }
 125         _kdm_valid = node->bool_child ("KDMValid");
 126         _reference_video = node->optional_bool_child ("ReferenceVideo").get_value_or (false);
 127         _reference_audio = node->optional_bool_child ("ReferenceAudio").get_value_or (false);
 128         if (version >= 37) {
 129                 _reference_text[static_cast<int>(TextType::OPEN_SUBTITLE)] = node->optional_bool_child("ReferenceOpenSubtitle").get_value_or(false);
 130                 _reference_text[static_cast<int>(TextType::CLOSED_CAPTION)] = node->optional_bool_child("ReferenceClosedCaption").get_value_or(false);
 131         } else {
 132                 _reference_text[static_cast<int>(TextType::OPEN_SUBTITLE)] = node->optional_bool_child("ReferenceSubtitle").get_value_or(false);
 133                 _reference_text[static_cast<int>(TextType::CLOSED_CAPTION)] = false;
 134         }
 135         if (node->optional_string_child("Standard")) {
 136                 auto const s = node->optional_string_child("Standard").get();
 137                 if (s == "Interop") {
 138                         _standard = dcp::Standard::INTEROP;
 139                 } else if (s == "SMPTE") {
 140                         _standard = dcp::Standard::SMPTE;
 141                 } else {
 142                         DCPOMATIC_ASSERT (false);
 143                 }
 144         }
 145         _three_d = node->optional_bool_child("ThreeD").get_value_or (false);
 146
 147         auto ck = node->optional_string_child("ContentKind");
 148         if (ck) {
 149                 _content_kind = dcp::content_kind_from_string (*ck);
 150         }
 151         _cpl = node->optional_string_child("CPL");
 152         for (auto i: node->node_children("ReelLength")) {
 153                 _reel_lengths.push_back (raw_convert<int64_t> (i->content ()));
 154         }
 155
 156         for (auto i: node->node_children("Marker")) {
 157                 _markers[dcp::marker_from_string(i->string_attribute("type"))] = ContentTime(raw_convert<int64_t>(i->content()));
 158         }
 159
 160         for (auto i: node->node_children("Rating")) {
 161                 _ratings.push_back (dcp::Rating(i));
 162         }
 163
 164         for (auto i: node->node_children("ContentVersion")) {
 165                 _content_versions.push_back (i->content());
 166         }
 167 }
 168
 169 void
 170 DCPContent::read_directory (boost::filesystem::path p)
 171 {
 172         using namespace boost::filesystem;
 173
 174         bool have_assetmap = false;
 175         bool have_metadata = false;
 176
 177         for (directory_iterator i(p); i != directory_iterator(); ++i) {
 178                 if (i->path().filename() == "ASSETMAP" || i->path().filename() == "ASSETMAP.xml") {
 179                         have_assetmap = true;
 180                 } else if (i->path().filename() == "metadata.xml") {
 181                         have_metadata = true;
 182                 }
 183         }
 184
 185         if (!have_assetmap) {
 186                 if (!have_metadata) {
 187                         throw DCPError ("No ASSETMAP or ASSETMAP.xml file found: is this a DCP?");
 188                 } else {
 189                         throw ProjectFolderError ();
 190                 }
 191         }
 192
 193         read_sub_directory (p);
 194 }
 195
 196 void
 197 DCPContent::read_sub_directory (boost::filesystem::path p)
 198 {
 199         LOG_GENERAL ("DCPContent::read_sub_directory reads %1", p.string());
 200         for (auto i: boost::filesystem::directory_iterator(p)) {
 201                 if (boost::filesystem::is_regular_file(i.path())) {
 202                         LOG_GENERAL ("Inside there's regular file %1", i.path().string());
 203                         add_path (i.path());
 204                 } else if (boost::filesystem::is_directory (i.path())) {
 205                         LOG_GENERAL ("Inside there's directory %1", i.path().string());
 206                         read_sub_directory (i.path());
 207                 }
 208         }
 209 }
 210
 211 /** @param film Film, or 0 */
 212 void
 213 DCPContent::examine (shared_ptr<const Film> film, shared_ptr<Job> job)
 214 {
 215         bool const needed_assets = needs_assets ();
 216         bool const needed_kdm = needs_kdm ();
 217         string const old_name = name ();
 218
 219         ContentChangeSignaller cc_texts (this, DCPContentProperty::TEXTS);
 220         ContentChangeSignaller cc_assets (this, DCPContentProperty::NEEDS_ASSETS);
 221         ContentChangeSignaller cc_kdm (this, DCPContentProperty::NEEDS_KDM);
 222         ContentChangeSignaller cc_name (this, DCPContentProperty::NAME);
 223
 224         if (job) {
 225                 job->set_progress_unknown ();
 226         }
 227         Content::examine (film, job);
 228
 229         auto examiner = make_shared<DCPExaminer>(shared_from_this(), film ? film->tolerant() : true);
 230
 231         if (examiner->has_video()) {
 232                 {
 233                         boost::mutex::scoped_lock lm (_mutex);
 234                         video = make_shared<VideoContent>(this);
 235                 }
 236                 video->take_from_examiner (examiner);
 237                 set_default_colour_conversion ();
 238         }
 239
 240         if (examiner->has_audio()) {
 241                 {
 242                         boost::mutex::scoped_lock lm (_mutex);
 243                         audio = make_shared<AudioContent>(this);
 244                 }
 245                 audio->set_language (examiner->audio_language());
 246                 auto as = make_shared<AudioStream>(examiner->audio_frame_rate(), examiner->audio_length(), examiner->audio_channels());
 247                 audio->set_stream (as);
 248                 auto m = as->mapping ();
 249                 m.make_default (film ? film->audio_processor() : 0);
 250                 as->set_mapping (m);
 251         }
 252
 253         if (examiner->has_atmos()) {
 254                 {
 255                         boost::mutex::scoped_lock lm (_mutex);
 256                         atmos = make_shared<AtmosContent>(this);
 257                 }
 258                 /* Setting length will cause calculations to be made based on edit rate, so that must
 259                  * be set up first otherwise hard-to-spot exceptions will be thrown.
 260                  */
 261                 atmos->set_edit_rate (examiner->atmos_edit_rate());
 262                 atmos->set_length (examiner->atmos_length());
 263         }
 264
 265         list<shared_ptr<TextContent>> new_text;
 266
 267         for (int i = 0; i < examiner->text_count(TextType::OPEN_SUBTITLE); ++i) {
 268                 auto c = make_shared<TextContent>(this, TextType::OPEN_SUBTITLE, TextType::OPEN_SUBTITLE);
 269                 c->set_language (examiner->open_subtitle_language());
 270                 new_text.push_back (c);
 271         }
 272
 273         for (int i = 0; i < examiner->text_count(TextType::CLOSED_CAPTION); ++i) {
 274                 auto c = make_shared<TextContent>(this, TextType::CLOSED_CAPTION, TextType::CLOSED_CAPTION);
 275                 c->set_dcp_track (examiner->dcp_text_track(i));
 276                 new_text.push_back (c);
 277         }
 278
 279         {
 280                 boost::mutex::scoped_lock lm (_mutex);
 281                 text = new_text;
 282                 _name = examiner->name ();
 283                 _encrypted = examiner->encrypted ();
 284                 _needs_assets = examiner->needs_assets ();
 285                 _kdm_valid = examiner->kdm_valid ();
 286                 _standard = examiner->standard ();
 287                 _three_d = examiner->three_d ();
 288                 _content_kind = examiner->content_kind ();
 289                 _cpl = examiner->cpl ();
 290                 _reel_lengths = examiner->reel_lengths ();
 291                 for (auto const& i: examiner->markers()) {
 292                         _markers[i.first] = ContentTime(i.second.as_editable_units_ceil(DCPTime::HZ));
 293                 }
 294                 _ratings = examiner->ratings ();
 295                 _content_versions = examiner->content_versions ();
 296         }
 297
 298         if (needed_assets == needs_assets()) {
 299                 cc_assets.abort ();
 300         }
 301
 302         if (needed_kdm == needs_kdm()) {
 303                 cc_kdm.abort ();
 304         }
 305
 306         if (old_name == name()) {
 307                 cc_name.abort ();
 308         }
 309
 310         if (video) {
 311                 video->set_frame_type (_three_d ? VideoFrameType::THREE_D : VideoFrameType::TWO_D);
 312         }
 313 }
 314
 315 string
 316 DCPContent::summary () const
 317 {
 318         boost::mutex::scoped_lock lm (_mutex);
 319         return String::compose (_("%1 [DCP]"), _name);
 320 }
 321
 322 string
 323 DCPContent::technical_summary () const
 324 {
 325         string s = Content::technical_summary() + " - ";
 326         if (video) {
 327                 s += video->technical_summary() + " - ";
 328         }
 329         if (audio) {
 330                 s += audio->technical_summary() + " - ";
 331         }
 332         return s;
 333 }
 334
 335 void
 336 DCPContent::as_xml (xmlpp::Node* node, bool with_paths) const
 337 {
 338         node->add_child("Type")->add_child_text ("DCP");
 339
 340         Content::as_xml (node, with_paths);
 341
 342         if (video) {
 343                 video->as_xml (node);
 344         }
 345
 346         if (audio) {
 347                 audio->as_xml (node);
 348                 node->add_child("AudioFrameRate")->add_child_text (raw_convert<string> (audio->stream()->frame_rate()));
 349                 node->add_child("AudioLength")->add_child_text (raw_convert<string> (audio->stream()->length()));
 350                 audio->stream()->mapping().as_xml (node->add_child("AudioMapping"));
 351         }
 352
 353         for (auto i: text) {
 354                 i->as_xml (node);
 355         }
 356
 357         if (atmos) {
 358                 atmos->as_xml (node);
 359         }
 360
 361         boost::mutex::scoped_lock lm (_mutex);
 362         node->add_child("Name")->add_child_text (_name);
 363         node->add_child("Encrypted")->add_child_text (_encrypted ? "1" : "0");
 364         node->add_child("NeedsAssets")->add_child_text (_needs_assets ? "1" : "0");
 365         if (_kdm) {
 366                 node->add_child("KDM")->add_child_text (_kdm->as_xml ());
 367         }
 368         node->add_child("KDMValid")->add_child_text (_kdm_valid ? "1" : "0");
 369         node->add_child("ReferenceVideo")->add_child_text (_reference_video ? "1" : "0");
 370         node->add_child("ReferenceAudio")->add_child_text (_reference_audio ? "1" : "0");
 371         node->add_child("ReferenceOpenSubtitle")->add_child_text(_reference_text[static_cast<int>(TextType::OPEN_SUBTITLE)] ? "1" : "0");
 372         node->add_child("ReferenceClosedCaption")->add_child_text(_reference_text[static_cast<int>(TextType::CLOSED_CAPTION)] ? "1" : "0");
 373         if (_standard) {
 374                 switch (_standard.get ()) {
 375                 case dcp::Standard::INTEROP:
 376                         node->add_child("Standard")->add_child_text ("Interop");
 377                         break;
 378                 case dcp::Standard::SMPTE:
 379                         node->add_child("Standard")->add_child_text ("SMPTE");
 380                         break;
 381                 default:
 382                         DCPOMATIC_ASSERT (false);
 383                 }
 384         }
 385         node->add_child("ThreeD")->add_child_text (_three_d ? "1" : "0");
 386         if (_content_kind) {
 387                 node->add_child("ContentKind")->add_child_text(dcp::content_kind_to_string(*_content_kind));
 388         }
 389         if (_cpl) {
 390                 node->add_child("CPL")->add_child_text (_cpl.get ());
 391         }
 392         for (auto i: _reel_lengths) {
 393                 node->add_child("ReelLength")->add_child_text (raw_convert<string> (i));
 394         }
 395
 396         for (auto const& i: _markers) {
 397                 auto marker = node->add_child("Marker");
 398                 marker->set_attribute("type", dcp::marker_to_string(i.first));
 399                 marker->add_child_text(raw_convert<string>(i.second.get()));
 400         }
 401
 402         for (auto i: _ratings) {
 403                 auto rating = node->add_child("Rating");
 404                 i.as_xml (rating);
 405         }
 406
 407         for (auto i: _content_versions) {
 408                 node->add_child("ContentVersion")->add_child_text(i);
 409         }
 410 }
 411
 412 DCPTime
 413 DCPContent::full_length (shared_ptr<const Film> film) const
 414 {
 415         if (!video) {
 416                 return {};
 417         }
 418         FrameRateChange const frc (film, shared_from_this());
 419         return DCPTime::from_frames (llrint(video->length() * frc.factor()), film->video_frame_rate());
 420 }
 421
 422 DCPTime
 423 DCPContent::approximate_length () const
 424 {
 425         if (!video) {
 426                 return {};
 427         }
 428         return DCPTime::from_frames (video->length(), 24);
 429 }
 430
 431 string
 432 DCPContent::identifier () const
 433 {
 434         string s = Content::identifier() + "_";
 435
 436         if (video) {
 437                 s += video->identifier() + "_";
 438         }
 439
 440         for (auto i: text) {
 441                 s += i->identifier () + " ";
 442         }
 443
 444         s += string (_reference_video ? "1" : "0");
 445         for (int i = 0; i < static_cast<int>(TextType::COUNT); ++i) {
 446                 s += string (_reference_text[i] ? "1" : "0");
 447         }
 448         return s;
 449 }
 450
 451 void
 452 DCPContent::add_kdm (dcp::EncryptedKDM k)
 453 {
 454         _kdm = k;
 455 }
 456
 457 void
 458 DCPContent::add_ov (boost::filesystem::path ov)
 459 {
 460         read_directory (ov);
 461 }
 462
 463 bool
 464 DCPContent::can_be_played () const
 465 {
 466         return !needs_kdm() && !needs_assets();
 467 }
 468
 469 bool
 470 DCPContent::needs_kdm () const
 471 {
 472         boost::mutex::scoped_lock lm (_mutex);
 473         return _encrypted && !_kdm_valid;
 474 }
 475
 476 bool
 477 DCPContent::needs_assets () const
 478 {
 479         boost::mutex::scoped_lock lm (_mutex);
 480         return _needs_assets;
 481 }
 482
 483 vector<boost::filesystem::path>
 484 DCPContent::directories () const
 485 {
 486         return dcp::DCP::directories_from_files (paths());
 487 }
 488
 489 void
 490 DCPContent::add_properties (shared_ptr<const Film> film, list<UserProperty>& p) const
 491 {
 492         Content::add_properties (film, p);
 493         if (video) {
 494                 video->add_properties (p);
 495         }
 496         if (audio) {
 497                 audio->add_properties (film, p);
 498         }
 499 }
 500
 501 void
 502 DCPContent::set_default_colour_conversion ()
 503 {
 504         /* Default to no colour conversion for DCPs */
 505         if (video) {
 506                 video->unset_colour_conversion ();
 507         }
 508 }
 509
 510 void
 511 DCPContent::set_reference_video (bool r)
 512 {
 513         ContentChangeSignaller cc (this, DCPContentProperty::REFERENCE_VIDEO);
 514
 515         {
 516                 boost::mutex::scoped_lock lm (_mutex);
 517                 _reference_video = r;
 518         }
 519 }
 520
 521 void
 522 DCPContent::set_reference_audio (bool r)
 523 {
 524         ContentChangeSignaller cc (this, DCPContentProperty::REFERENCE_AUDIO);
 525
 526         {
 527                 boost::mutex::scoped_lock lm (_mutex);
 528                 _reference_audio = r;
 529         }
 530 }
 531
 532 void
 533 DCPContent::set_reference_text (TextType type, bool r)
 534 {
 535         ContentChangeSignaller cc (this, DCPContentProperty::REFERENCE_TEXT);
 536
 537         {
 538                 boost::mutex::scoped_lock lm (_mutex);
 539                 _reference_text[static_cast<int>(type)] = r;
 540         }
 541 }
 542
 543 list<DCPTimePeriod>
 544 DCPContent::reels (shared_ptr<const Film> film) const
 545 {
 546         auto reel_lengths = _reel_lengths;
 547         if (reel_lengths.empty()) {
 548                 /* Old metadata with no reel lengths; get them here instead */
 549                 try {
 550                         scoped_ptr<DCPExaminer> examiner (new DCPExaminer(shared_from_this(), film->tolerant()));
 551                         reel_lengths = examiner->reel_lengths ();
 552                 } catch (...) {
 553                         /* Could not examine the DCP; guess reels */
 554                         reel_lengths.push_back (length_after_trim(film).frames_round(film->video_frame_rate()));
 555                 }
 556         }
 557
 558         list<DCPTimePeriod> p;
 559
 560         /* This content's frame rate must be the same as the output DCP rate, so we can
 561            convert `directly' from ContentTime to DCPTime.
 562         */
 563
 564         /* The starting point of this content on the timeline */
 565         auto pos = position() - DCPTime (trim_start().get());
 566
 567         for (auto i: reel_lengths) {
 568                 /* This reel runs from `pos' to `to' */
 569                 DCPTime const to = pos + DCPTime::from_frames (i, film->video_frame_rate());
 570                 if (to > position()) {
 571                         p.push_back (DCPTimePeriod(max(position(), pos), min(end(film), to)));
 572                         if (to > end(film)) {
 573                                 break;
 574                         }
 575                 }
 576                 pos = to;
 577         }
 578
 579         return p;
 580 }
 581
 582 list<DCPTime>
 583 DCPContent::reel_split_points (shared_ptr<const Film> film) const
 584 {
 585         list<DCPTime> s;
 586         for (auto i: reels(film)) {
 587                 s.push_back (i.from);
 588         }
 589         return s;
 590 }
 591
 592 bool
 593 DCPContent::can_reference (shared_ptr<const Film> film, function<bool (shared_ptr<const Content>)> part, string overlapping, string& why_not) const
 594 {
 595         /* We must be using the same standard as the film */
 596         if (_standard) {
 597                 if (_standard.get() == dcp::Standard::INTEROP && !film->interop()) {
 598                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 599                         why_not = _("it is Interop and the film is set to SMPTE.");
 600                         return false;
 601                 } else if (_standard.get() == dcp::Standard::SMPTE && film->interop()) {
 602                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 603                         why_not = _("it is SMPTE and the film is set to Interop.");
 604                         return false;
 605                 }
 606         }
 607
 608         /* And the same frame rate */
 609         if (!video_frame_rate() || (lrint(video_frame_rate().get()) != film->video_frame_rate())) {
 610                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 611                 why_not = _("it has a different frame rate to the film.");
 612                 return false;
 613         }
 614
 615         auto const fr = film->reels ();
 616
 617         list<DCPTimePeriod> reel_list;
 618         try {
 619                 reel_list = reels (film);
 620         } catch (dcp::ReadError &) {
 621                 /* We couldn't read the DCP; it's probably missing */
 622                 return false;
 623         } catch (dcp::KDMDecryptionError &) {
 624                 /* We have an incorrect KDM */
 625                 return false;
 626         }
 627
 628         /* fr must contain reels().  It can also contain other reels, but it must at
 629            least contain reels().
 630         */
 631         for (auto i: reel_list) {
 632                 if (find (fr.begin(), fr.end(), i) == fr.end ()) {
 633                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 634                         why_not = _("its reel lengths differ from those in the film; set the reel mode to 'split by video content'.");
 635                         return false;
 636                 }
 637         }
 638
 639         auto a = overlaps (film, film->content(), part, position(), end(film));
 640         if (a.size() != 1 || a.front().get() != this) {
 641                 why_not = overlapping;
 642                 return false;
 643         }
 644
 645         return true;
 646 }
 647
 648 static
 649 bool check_video (shared_ptr<const Content> c)
 650 {
 651         return static_cast<bool>(c->video) && c->video->use();
 652 }
 653
 654 bool
 655 DCPContent::can_reference_video (shared_ptr<const Film> film, string& why_not) const
 656 {
 657         if (!video) {
 658                 why_not = _("There is no video in this DCP");
 659                 return false;
 660         }
 661
 662         if (film->resolution() != resolution()) {
 663                 if (resolution() == Resolution::FOUR_K) {
 664                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 665                         why_not = _("it is 4K and the film is 2K.");
 666                 } else {
 667                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 668                         why_not = _("it is 2K and the film is 4K.");
 669                 }
 670                 return false;
 671         } else if (film->frame_size() != video->size()) {
 672                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 673                 why_not = _("its video frame size differs from the film's.");
 674                 return false;
 675         }
 676
 677         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 678         return can_reference (film, bind (&check_video, _1), _("it overlaps other video content; remove the other content."), why_not);
 679 }
 680
 681 static
 682 bool check_audio (shared_ptr<const Content> c)
 683 {
 684         return static_cast<bool>(c->audio) && !c->audio->mapping().mapped_output_channels().empty();
 685 }
 686
 687 bool
 688 DCPContent::can_reference_audio (shared_ptr<const Film> film, string& why_not) const
 689 {
 690         shared_ptr<DCPDecoder> decoder;
 691         try {
 692                 decoder.reset (new DCPDecoder (film, shared_from_this(), false, film->tolerant(), shared_ptr<DCPDecoder>()));
 693         } catch (dcp::ReadError &) {
 694                 /* We couldn't read the DCP, so it's probably missing */
 695                 return false;
 696         } catch (DCPError &) {
 697                 /* We couldn't read the DCP, so it's probably missing */
 698                 return false;
 699         } catch (dcp::KDMDecryptionError &) {
 700                 /* We have an incorrect KDM */
 701                 return false;
 702         }
 703
 704         for (auto i: decoder->reels()) {
 705                 if (!i->main_sound()) {
 706                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 707                         why_not = _("it does not have sound in all its reels.");
 708                         return false;
 709                 }
 710         }
 711
 712         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 713         return can_reference (film, bind (&check_audio, _1), _("it overlaps other audio content; remove the other content."), why_not);
 714 }
 715
 716 static
 717 bool check_text (shared_ptr<const Content> c)
 718 {
 719         return !c->text.empty();
 720 }
 721
 722 bool
 723 DCPContent::can_reference_text (shared_ptr<const Film> film, TextType type, string& why_not) const
 724 {
 725         shared_ptr<DCPDecoder> decoder;
 726         try {
 727                 decoder.reset (new DCPDecoder (film, shared_from_this(), false, film->tolerant(), shared_ptr<DCPDecoder>()));
 728         } catch (dcp::ReadError &) {
 729                 /* We couldn't read the DCP, so it's probably missing */
 730                 return false;
 731         } catch (dcp::KDMDecryptionError &) {
 732                 /* We have an incorrect KDM */
 733                 return false;
 734         }
 735
 736         for (auto i: decoder->reels()) {
 737                 if (type == TextType::OPEN_SUBTITLE) {
 738                         if (!i->main_subtitle()) {
 739                                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 740                                 why_not = _("it does not have open subtitles in all its reels.");
 741                                 return false;
 742                         } else if (i->main_subtitle()->entry_point().get_value_or(0) != 0) {
 743                                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 744                                 why_not = _("one if its subtitle reels has a non-zero entry point so it must be re-written.");
 745                                 return false;
 746                         }
 747                 }
 748                 if (type == TextType::CLOSED_CAPTION) {
 749                         if (i->closed_captions().empty()) {
 750                                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 751                                 why_not = _("it does not have closed captions in all its reels.");
 752                                 return false;
 753                         }
 754                         for (auto j: i->closed_captions()) {
 755                                 if (j->entry_point().get_value_or(0) != 0) {
 756                                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 757                                         why_not = _("one if its closed caption has a non-zero entry point so it must be re-written.");
 758                                         return false;
 759                                 }
 760                         }
 761                 }
 762         }
 763
 764         if (trim_start() != dcpomatic::ContentTime()) {
 765                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 766                 why_not = _("it has a start trim so its subtitles or closed captions must be re-written.");
 767                 return false;
 768         }
 769
 770         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 771         return can_reference (film, bind (&check_text, _1), _("it overlaps other text content; remove the other content."), why_not);
 772 }
 773
 774 void
 775 DCPContent::take_settings_from (shared_ptr<const Content> c)
 776 {
 777         auto dc = dynamic_pointer_cast<const DCPContent>(c);
 778         if (!dc) {
 779                 return;
 780         }
 781
 782         _reference_video = dc->_reference_video;
 783         _reference_audio = dc->_reference_audio;
 784         for (int i = 0; i < static_cast<int>(TextType::COUNT); ++i) {
 785                 _reference_text[i] = dc->_reference_text[i];
 786         }
 787 }
 788
 789 void
 790 DCPContent::set_cpl (string id)
 791 {
 792         ContentChangeSignaller cc (this, DCPContentProperty::CPL);
 793
 794         {
 795                 boost::mutex::scoped_lock lm (_mutex);
 796                 _cpl = id;
 797         }
 798 }
 799
 800 bool
 801 DCPContent::kdm_timing_window_valid () const
 802 {
 803         if (!_kdm) {
 804                 return true;
 805         }
 806
 807         dcp::LocalTime now;
 808         return _kdm->not_valid_before() < now && now < _kdm->not_valid_after();
 809 }
 810
 811
 812 Resolution
 813 DCPContent::resolution () const
 814 {
 815         if (video->size().width > 2048 || video->size().height > 1080) {
 816                 return Resolution::FOUR_K;
 817         }
 818
 819         return Resolution::TWO_K;
 820 }
 821