src/lib/dcp_content.cc

   1 /*
   2     Copyright (C) 2014-2023 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
  22 #include "atmos_content.h"
  23 #include "audio_content.h"
  24 #include "compose.hpp"
  25 #include "config.h"
  26 #include "dcp_content.h"
  27 #include "dcp_decoder.h"
  28 #include "dcp_examiner.h"
  29 #include "dcpomatic_log.h"
  30 #include "film.h"
  31 #include "job.h"
  32 #include "log.h"
  33 #include "overlaps.h"
  34 #include "text_content.h"
  35 #include "video_content.h"
  36 #include <dcp/dcp.h>
  37 #include <dcp/raw_convert.h>
  38 #include <dcp/exceptions.h>
  39 #include <dcp/reel_closed_caption_asset.h>
  40 #include <dcp/reel_picture_asset.h>
  41 #include <dcp/reel_subtitle_asset.h>
  42 #include <dcp/reel.h>
  43 #include <dcp/scope_guard.h>
  44 #include <libxml++/libxml++.h>
  45 #include <iterator>
  46 #include <iostream>
  47
  48 #include "i18n.h"
  49
  50
  51 using std::cout;
  52 using std::dynamic_pointer_cast;
  53 using std::exception;
  54 using std::function;
  55 using std::list;
  56 using std::make_shared;
  57 using std::shared_ptr;
  58 using std::string;
  59 using std::vector;
  60 using boost::optional;
  61 using boost::scoped_ptr;
  62 #if BOOST_VERSION >= 106100
  63 using namespace boost::placeholders;
  64 #endif
  65 using dcp::raw_convert;
  66 using namespace dcpomatic;
  67
  68
  69 int const DCPContentProperty::NEEDS_ASSETS       = 600;
  70 int const DCPContentProperty::NEEDS_KDM          = 601;
  71 int const DCPContentProperty::REFERENCE_VIDEO    = 602;
  72 int const DCPContentProperty::REFERENCE_AUDIO    = 603;
  73 int const DCPContentProperty::REFERENCE_TEXT     = 604;
  74 int const DCPContentProperty::NAME               = 605;
  75 int const DCPContentProperty::TEXTS              = 606;
  76 int const DCPContentProperty::CPL                = 607;
  77
  78
  79 DCPContent::DCPContent (boost::filesystem::path p)
  80         : _encrypted (false)
  81         , _needs_assets (false)
  82         , _kdm_valid (false)
  83         , _reference_video (false)
  84         , _reference_audio (false)
  85         , _three_d (false)
  86 {
  87         LOG_GENERAL ("Creating DCP content from %1", p.string());
  88
  89         read_directory (p);
  90         set_default_colour_conversion ();
  91 }
  92
  93 DCPContent::DCPContent (cxml::ConstNodePtr node, int version)
  94         : Content (node)
  95 {
  96         video = VideoContent::from_xml (this, node, version, VideoRange::FULL);
  97         audio = AudioContent::from_xml (this, node, version);
  98         list<string> notes;
  99         text = TextContent::from_xml (this, node, version, notes);
 100         atmos = AtmosContent::from_xml (this, node);
 101
 102         if (video && audio) {
 103                 audio->set_stream (
 104                         make_shared<AudioStream> (
 105                                 node->number_child<int> ("AudioFrameRate"),
 106                                 /* AudioLength was not present in some old metadata versions */
 107                                 node->optional_number_child<Frame>("AudioLength").get_value_or (
 108                                         video->length() * node->number_child<int>("AudioFrameRate") / video_frame_rate().get()
 109                                         ),
 110                                 AudioMapping(node->node_child("AudioMapping"), version),
 111                                 24
 112                                 )
 113                         );
 114         }
 115
 116         _name = node->string_child ("Name");
 117         _encrypted = node->bool_child ("Encrypted");
 118         _needs_assets = node->optional_bool_child("NeedsAssets").get_value_or (false);
 119         if (node->optional_node_child ("KDM")) {
 120                 _kdm = dcp::EncryptedKDM (node->string_child ("KDM"));
 121         }
 122         _kdm_valid = node->bool_child ("KDMValid");
 123         _reference_video = node->optional_bool_child ("ReferenceVideo").get_value_or (false);
 124         _reference_audio = node->optional_bool_child ("ReferenceAudio").get_value_or (false);
 125         if (version >= 37) {
 126                 _reference_text[TextType::OPEN_SUBTITLE] = node->optional_bool_child("ReferenceOpenSubtitle").get_value_or(false);
 127                 _reference_text[TextType::CLOSED_CAPTION] = node->optional_bool_child("ReferenceClosedCaption").get_value_or(false);
 128         } else {
 129                 _reference_text[TextType::OPEN_SUBTITLE] = node->optional_bool_child("ReferenceSubtitle").get_value_or(false);
 130                 _reference_text[TextType::CLOSED_CAPTION] = false;
 131         }
 132         if (node->optional_string_child("Standard")) {
 133                 auto const s = node->optional_string_child("Standard").get();
 134                 if (s == "Interop") {
 135                         _standard = dcp::Standard::INTEROP;
 136                 } else if (s == "SMPTE") {
 137                         _standard = dcp::Standard::SMPTE;
 138                 } else {
 139                         DCPOMATIC_ASSERT (false);
 140                 }
 141         }
 142         _three_d = node->optional_bool_child("ThreeD").get_value_or (false);
 143
 144         auto ck = node->optional_string_child("ContentKind");
 145         if (ck) {
 146                 _content_kind = dcp::ContentKind::from_name(*ck);
 147         }
 148         _cpl = node->optional_string_child("CPL");
 149         for (auto i: node->node_children("ReelLength")) {
 150                 _reel_lengths.push_back (raw_convert<int64_t> (i->content ()));
 151         }
 152
 153         for (auto i: node->node_children("Marker")) {
 154                 _markers[dcp::marker_from_string(i->string_attribute("type"))] = ContentTime(raw_convert<int64_t>(i->content()));
 155         }
 156
 157         for (auto i: node->node_children("Rating")) {
 158                 _ratings.push_back (dcp::Rating(i));
 159         }
 160
 161         for (auto i: node->node_children("ContentVersion")) {
 162                 _content_versions.push_back (i->content());
 163         }
 164
 165         _active_audio_channels = node->optional_number_child<int>("ActiveAudioChannels");
 166
 167         for (auto non_zero: node->node_children("HasNonZeroEntryPoint")) {
 168                 try {
 169                         auto type = string_to_text_type(non_zero->string_attribute("type"));
 170                         _has_non_zero_entry_point[type] = non_zero->content() == "1";
 171                 } catch (MetadataError&) {}
 172         }
 173 }
 174
 175 void
 176 DCPContent::read_directory (boost::filesystem::path p)
 177 {
 178         using namespace boost::filesystem;
 179
 180         bool have_assetmap = false;
 181         bool have_metadata = false;
 182
 183         for (auto i: directory_iterator(p)) {
 184                 if (i.path().filename() == "ASSETMAP" || i.path().filename() == "ASSETMAP.xml") {
 185                         have_assetmap = true;
 186                 } else if (i.path().filename() == "metadata.xml") {
 187                         have_metadata = true;
 188                 }
 189         }
 190
 191         if (!have_assetmap) {
 192                 if (!have_metadata) {
 193                         throw DCPError ("No ASSETMAP or ASSETMAP.xml file found: is this a DCP?");
 194                 } else {
 195                         throw ProjectFolderError ();
 196                 }
 197         }
 198
 199         read_sub_directory (p);
 200 }
 201
 202 void
 203 DCPContent::read_sub_directory (boost::filesystem::path p)
 204 {
 205         using namespace boost::filesystem;
 206
 207         LOG_GENERAL ("DCPContent::read_sub_directory reads %1", p.string());
 208         try {
 209                 for (auto i: directory_iterator(p)) {
 210                         if (is_regular_file(i.path())) {
 211                                 LOG_GENERAL ("Inside there's regular file %1", i.path().string());
 212                                 add_path (i.path());
 213                         } else if (is_directory(i.path()) && i.path().filename() != ".AppleDouble") {
 214                                 LOG_GENERAL ("Inside there's directory %1", i.path().string());
 215                                 read_sub_directory (i.path());
 216                         } else {
 217                                 LOG_GENERAL("Ignoring %1 from inside: status is %2", i.path().string(), static_cast<int>(status(i.path()).type()));
 218                         }
 219                 }
 220         } catch (exception& e) {
 221                 LOG_GENERAL("Failed to iterate over %1: %2", p.string(), e.what());
 222         }
 223 }
 224
 225 /** @param film Film, or 0 */
 226 void
 227 DCPContent::examine (shared_ptr<const Film> film, shared_ptr<Job> job)
 228 {
 229         bool const needed_assets = needs_assets ();
 230         bool const needed_kdm = needs_kdm ();
 231         string const old_name = name ();
 232
 233         ContentChangeSignalDespatcher::instance()->suspend();
 234         dcp::ScopeGuard sg = []() {
 235                 ContentChangeSignalDespatcher::instance()->resume();
 236         };
 237
 238         ContentChangeSignaller cc_texts (this, DCPContentProperty::TEXTS);
 239         ContentChangeSignaller cc_assets (this, DCPContentProperty::NEEDS_ASSETS);
 240         ContentChangeSignaller cc_kdm (this, DCPContentProperty::NEEDS_KDM);
 241         ContentChangeSignaller cc_name (this, DCPContentProperty::NAME);
 242
 243         if (job) {
 244                 job->set_progress_unknown ();
 245         }
 246         Content::examine (film, job);
 247
 248         auto examiner = make_shared<DCPExaminer>(shared_from_this(), film ? film->tolerant() : true);
 249
 250         if (examiner->has_video()) {
 251                 {
 252                         boost::mutex::scoped_lock lm (_mutex);
 253                         video = make_shared<VideoContent>(this);
 254                 }
 255                 video->take_from_examiner(film, examiner);
 256                 set_default_colour_conversion ();
 257         }
 258
 259         if (examiner->has_audio()) {
 260                 {
 261                         boost::mutex::scoped_lock lm (_mutex);
 262                         audio = make_shared<AudioContent>(this);
 263                 }
 264                 auto as = make_shared<AudioStream>(examiner->audio_frame_rate(), examiner->audio_length(), examiner->audio_channels(), 24);
 265                 audio->set_stream (as);
 266                 auto m = as->mapping ();
 267                 m.make_default (film ? film->audio_processor() : 0);
 268                 as->set_mapping (m);
 269
 270                 _active_audio_channels = examiner->active_audio_channels();
 271         }
 272
 273         if (examiner->has_atmos()) {
 274                 {
 275                         boost::mutex::scoped_lock lm (_mutex);
 276                         atmos = make_shared<AtmosContent>(this);
 277                 }
 278                 /* Setting length will cause calculations to be made based on edit rate, so that must
 279                  * be set up first otherwise hard-to-spot exceptions will be thrown.
 280                  */
 281                 atmos->set_edit_rate (examiner->atmos_edit_rate());
 282                 atmos->set_length (examiner->atmos_length());
 283         }
 284
 285         vector<shared_ptr<TextContent>> new_text;
 286
 287         for (int i = 0; i < examiner->text_count(TextType::OPEN_SUBTITLE); ++i) {
 288                 auto c = make_shared<TextContent>(this, TextType::OPEN_SUBTITLE, TextType::OPEN_SUBTITLE);
 289                 c->set_language (examiner->open_subtitle_language());
 290                 examiner->add_fonts(c);
 291                 new_text.push_back (c);
 292         }
 293
 294         for (int i = 0; i < examiner->text_count(TextType::CLOSED_CAPTION); ++i) {
 295                 auto c = make_shared<TextContent>(this, TextType::CLOSED_CAPTION, TextType::CLOSED_CAPTION);
 296                 c->set_dcp_track (examiner->dcp_text_track(i));
 297                 examiner->add_fonts(c);
 298                 new_text.push_back (c);
 299         }
 300
 301         {
 302                 boost::mutex::scoped_lock lm (_mutex);
 303                 text = new_text;
 304                 _name = examiner->name ();
 305                 _encrypted = examiner->encrypted ();
 306                 _needs_assets = examiner->needs_assets ();
 307                 _kdm_valid = examiner->kdm_valid ();
 308                 _standard = examiner->standard ();
 309                 _three_d = examiner->three_d ();
 310                 _content_kind = examiner->content_kind ();
 311                 _cpl = examiner->cpl ();
 312                 _reel_lengths = examiner->reel_lengths ();
 313                 for (auto const& i: examiner->markers()) {
 314                         _markers[i.first] = ContentTime(i.second.as_editable_units_ceil(DCPTime::HZ));
 315                 }
 316                 _ratings = examiner->ratings ();
 317                 _content_versions = examiner->content_versions ();
 318                 _has_non_zero_entry_point = examiner->has_non_zero_entry_point();
 319         }
 320
 321         if (needed_assets == needs_assets()) {
 322                 cc_assets.abort ();
 323         }
 324
 325         if (needed_kdm == needs_kdm()) {
 326                 cc_kdm.abort ();
 327         }
 328
 329         if (old_name == name()) {
 330                 cc_name.abort ();
 331         }
 332
 333         if (video) {
 334                 video->set_frame_type (_three_d ? VideoFrameType::THREE_D : VideoFrameType::TWO_D);
 335         }
 336 }
 337
 338 string
 339 DCPContent::summary () const
 340 {
 341         boost::mutex::scoped_lock lm (_mutex);
 342         return String::compose (_("%1 [DCP]"), _name);
 343 }
 344
 345 string
 346 DCPContent::technical_summary () const
 347 {
 348         string s = Content::technical_summary() + " - ";
 349         if (video) {
 350                 s += video->technical_summary() + " - ";
 351         }
 352         if (audio) {
 353                 s += audio->technical_summary() + " - ";
 354         }
 355         return s;
 356 }
 357
 358
 359 void
 360 DCPContent::as_xml(xmlpp::Element* element, bool with_paths) const
 361 {
 362         cxml::add_text_child(element, "Type", "DCP");
 363
 364         Content::as_xml(element, with_paths);
 365
 366         if (video) {
 367                 video->as_xml(element);
 368         }
 369
 370         if (audio) {
 371                 audio->as_xml(element);
 372                 cxml::add_text_child(element, "AudioFrameRate", raw_convert<string>(audio->stream()->frame_rate()));
 373                 cxml::add_text_child(element, "AudioLength", raw_convert<string>(audio->stream()->length()));
 374                 audio->stream()->mapping().as_xml(cxml::add_child(element, "AudioMapping"));
 375         }
 376
 377         for (auto i: text) {
 378                 i->as_xml(element);
 379         }
 380
 381         if (atmos) {
 382                 atmos->as_xml(element);
 383         }
 384
 385         boost::mutex::scoped_lock lm (_mutex);
 386
 387         cxml::add_text_child(element, "Name", _name);
 388         cxml::add_text_child(element, "Encrypted", _encrypted ? "1" : "0");
 389         cxml::add_text_child(element, "NeedsAssets", _needs_assets ? "1" : "0");
 390         if (_kdm) {
 391                 cxml::add_text_child(element, "KDM", _kdm->as_xml());
 392         }
 393         cxml::add_text_child(element, "KDMValid", _kdm_valid ? "1" : "0");
 394         cxml::add_text_child(element, "ReferenceVideo", _reference_video ? "1" : "0");
 395         cxml::add_text_child(element, "ReferenceAudio", _reference_audio ? "1" : "0");
 396         cxml::add_text_child(element, "ReferenceOpenSubtitle", _reference_text[TextType::OPEN_SUBTITLE] ? "1" : "0");
 397         cxml::add_text_child(element, "ReferenceClosedCaption", _reference_text[TextType::CLOSED_CAPTION] ? "1" : "0");
 398         if (_standard) {
 399                 switch (_standard.get ()) {
 400                 case dcp::Standard::INTEROP:
 401                         cxml::add_text_child(element, "Standard", "Interop");
 402                         break;
 403                 case dcp::Standard::SMPTE:
 404                         cxml::add_text_child(element, "Standard", "SMPTE");
 405                         break;
 406                 default:
 407                         DCPOMATIC_ASSERT (false);
 408                 }
 409         }
 410         cxml::add_text_child(element, "ThreeD", _three_d ? "1" : "0");
 411         if (_content_kind) {
 412                 cxml::add_text_child(element, "ContentKind", _content_kind->name());
 413         }
 414         if (_cpl) {
 415                 cxml::add_text_child(element, "CPL", _cpl.get());
 416         }
 417         for (auto i: _reel_lengths) {
 418                 cxml::add_text_child(element, "ReelLength", raw_convert<string>(i));
 419         }
 420
 421         for (auto const& i: _markers) {
 422                 auto marker = cxml::add_child(element, "Marker");
 423                 marker->set_attribute("type", dcp::marker_to_string(i.first));
 424                 marker->add_child_text(raw_convert<string>(i.second.get()));
 425         }
 426
 427         for (auto i: _ratings) {
 428                 auto rating = cxml::add_child(element, "Rating");
 429                 i.as_xml (rating);
 430         }
 431
 432         for (auto i: _content_versions) {
 433                 cxml::add_text_child(element, "ContentVersion", i);
 434         }
 435
 436         if (_active_audio_channels) {
 437                 cxml::add_text_child(element, "ActiveAudioChannels", raw_convert<string>(*_active_audio_channels));
 438         }
 439
 440         for (auto i = 0; i < static_cast<int>(TextType::COUNT); ++i) {
 441                 if (_has_non_zero_entry_point[i]) {
 442                         auto has = cxml::add_child(element, "HasNonZeroEntryPoint");
 443                         has->add_child_text("1");
 444                         has->set_attribute("type", text_type_to_string(static_cast<TextType>(i)));
 445                 }
 446         }
 447 }
 448
 449
 450 DCPTime
 451 DCPContent::full_length (shared_ptr<const Film> film) const
 452 {
 453         if (!video) {
 454                 return {};
 455         }
 456         FrameRateChange const frc (film, shared_from_this());
 457         return DCPTime::from_frames (llrint(video->length() * frc.factor()), film->video_frame_rate());
 458 }
 459
 460 DCPTime
 461 DCPContent::approximate_length () const
 462 {
 463         if (!video) {
 464                 return {};
 465         }
 466         return DCPTime::from_frames (video->length(), 24);
 467 }
 468
 469 string
 470 DCPContent::identifier () const
 471 {
 472         string s = Content::identifier() + "_";
 473
 474         if (video) {
 475                 s += video->identifier() + "_";
 476         }
 477
 478         for (auto i: text) {
 479                 s += i->identifier () + " ";
 480         }
 481
 482         boost::mutex::scoped_lock lm(_mutex);
 483
 484         s += string (_reference_video ? "1" : "0");
 485         for (auto text: _reference_text) {
 486                 s += string(text ? "1" : "0");
 487         }
 488         return s;
 489 }
 490
 491 void
 492 DCPContent::add_kdm (dcp::EncryptedKDM k)
 493 {
 494         _kdm = k;
 495 }
 496
 497 void
 498 DCPContent::add_ov (boost::filesystem::path ov)
 499 {
 500         read_directory (ov);
 501 }
 502
 503 bool
 504 DCPContent::can_be_played () const
 505 {
 506         return !needs_kdm() && !needs_assets();
 507 }
 508
 509 bool
 510 DCPContent::needs_kdm () const
 511 {
 512         boost::mutex::scoped_lock lm (_mutex);
 513         return _encrypted && !_kdm_valid;
 514 }
 515
 516 bool
 517 DCPContent::needs_assets () const
 518 {
 519         boost::mutex::scoped_lock lm (_mutex);
 520         return _needs_assets;
 521 }
 522
 523 vector<boost::filesystem::path>
 524 DCPContent::directories () const
 525 {
 526         return dcp::DCP::directories_from_files (paths());
 527 }
 528
 529 void
 530 DCPContent::add_properties (shared_ptr<const Film> film, list<UserProperty>& p) const
 531 {
 532         Content::add_properties (film, p);
 533         if (video) {
 534                 video->add_properties (p);
 535         }
 536         if (audio) {
 537                 audio->add_properties (film, p);
 538         }
 539 }
 540
 541 void
 542 DCPContent::set_default_colour_conversion ()
 543 {
 544         /* Default to no colour conversion for DCPs */
 545         if (video) {
 546                 video->unset_colour_conversion ();
 547         }
 548 }
 549
 550 void
 551 DCPContent::set_reference_video (bool r)
 552 {
 553         ContentChangeSignaller cc (this, DCPContentProperty::REFERENCE_VIDEO);
 554
 555         {
 556                 boost::mutex::scoped_lock lm (_mutex);
 557                 _reference_video = r;
 558         }
 559 }
 560
 561 void
 562 DCPContent::set_reference_audio (bool r)
 563 {
 564         ContentChangeSignaller cc (this, DCPContentProperty::REFERENCE_AUDIO);
 565
 566         {
 567                 boost::mutex::scoped_lock lm (_mutex);
 568                 _reference_audio = r;
 569         }
 570 }
 571
 572 void
 573 DCPContent::set_reference_text (TextType type, bool r)
 574 {
 575         ContentChangeSignaller cc (this, DCPContentProperty::REFERENCE_TEXT);
 576
 577         {
 578                 boost::mutex::scoped_lock lm (_mutex);
 579                 _reference_text[type] = r;
 580         }
 581 }
 582
 583 list<DCPTimePeriod>
 584 DCPContent::reels (shared_ptr<const Film> film) const
 585 {
 586         auto reel_lengths = _reel_lengths;
 587         if (reel_lengths.empty()) {
 588                 /* Old metadata with no reel lengths; get them here instead */
 589                 try {
 590                         scoped_ptr<DCPExaminer> examiner (new DCPExaminer(shared_from_this(), film->tolerant()));
 591                         reel_lengths = examiner->reel_lengths ();
 592                 } catch (...) {
 593                         /* Could not examine the DCP; guess reels */
 594                         reel_lengths.push_back (length_after_trim(film).frames_round(film->video_frame_rate()));
 595                 }
 596         }
 597
 598         list<DCPTimePeriod> p;
 599
 600         /* This content's frame rate must be the same as the output DCP rate, so we can
 601            convert `directly' from ContentTime to DCPTime.
 602         */
 603
 604         /* The starting point of this content on the timeline */
 605         auto pos = position() - DCPTime (trim_start().get());
 606
 607         for (auto i: reel_lengths) {
 608                 /* This reel runs from `pos' to `to' */
 609                 DCPTime const to = pos + DCPTime::from_frames (i, film->video_frame_rate());
 610                 if (to > position()) {
 611                         p.push_back (DCPTimePeriod(max(position(), pos), min(end(film), to)));
 612                         if (to > end(film)) {
 613                                 break;
 614                         }
 615                 }
 616                 pos = to;
 617         }
 618
 619         return p;
 620 }
 621
 622 list<DCPTime>
 623 DCPContent::reel_split_points (shared_ptr<const Film> film) const
 624 {
 625         list<DCPTime> s;
 626         for (auto i: reels(film)) {
 627                 s.push_back (i.from);
 628         }
 629         return s;
 630 }
 631
 632 bool
 633 DCPContent::can_reference_anything(shared_ptr<const Film> film, string& why_not) const
 634 {
 635         /* We must be using the same standard as the film */
 636         if (_standard) {
 637                 if (_standard.get() == dcp::Standard::INTEROP && !film->interop()) {
 638                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 639                         why_not = _("it is Interop and the film is set to SMPTE.");
 640                         return false;
 641                 } else if (_standard.get() == dcp::Standard::SMPTE && film->interop()) {
 642                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 643                         why_not = _("it is SMPTE and the film is set to Interop.");
 644                         return false;
 645                 }
 646         }
 647
 648         /* And the same frame rate */
 649         if (!video_frame_rate() || (lrint(video_frame_rate().get()) != film->video_frame_rate())) {
 650                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 651                 why_not = _("it has a different frame rate to the film.");
 652                 return false;
 653         }
 654
 655         auto const fr = film->reels ();
 656
 657         list<DCPTimePeriod> reel_list;
 658         try {
 659                 reel_list = reels (film);
 660         } catch (dcp::ReadError &) {
 661                 /* We couldn't read the DCP; it's probably missing */
 662                 return false;
 663         } catch (dcp::KDMDecryptionError &) {
 664                 /* We have an incorrect KDM */
 665                 return false;
 666         }
 667
 668         /* fr must contain reels().  It can also contain other reels, but it must at
 669            least contain reels().
 670         */
 671         for (auto i: reel_list) {
 672                 if (find (fr.begin(), fr.end(), i) == fr.end ()) {
 673                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 674                         why_not = _("its reel lengths differ from those in the film; set the reel mode to 'split by video content'.");
 675                         return false;
 676                 }
 677         }
 678
 679         return true;
 680 }
 681
 682 bool
 683 DCPContent::overlaps(shared_ptr<const Film> film, function<bool (shared_ptr<const Content>)> part) const
 684 {
 685         auto const a = dcpomatic::overlaps(film, film->content(), part, position(), end(film));
 686         return a.size() != 1 || a.front().get() != this;
 687 }
 688
 689
 690 bool
 691 DCPContent::can_reference_video (shared_ptr<const Film> film, string& why_not) const
 692 {
 693         if (!video) {
 694                 why_not = _("There is no video in this DCP");
 695                 return false;
 696         }
 697
 698         if (film->resolution() != resolution()) {
 699                 if (resolution() == Resolution::FOUR_K) {
 700                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 701                         why_not = _("it is 4K and the film is 2K.");
 702                 } else {
 703                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 704                         why_not = _("it is 2K and the film is 4K.");
 705                 }
 706                 return false;
 707         } else if (film->frame_size() != video->size()) {
 708                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 709                 why_not = _("its video frame size differs from the film's.");
 710                 return false;
 711         }
 712
 713         auto part = [](shared_ptr<const Content> c) {
 714                 return static_cast<bool>(c->video) && c->video->use();
 715         };
 716
 717         if (overlaps(film, part)) {
 718                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 719                 why_not = _("it overlaps other video content.");
 720                 return false;
 721         }
 722
 723         return can_reference_anything(film, why_not);
 724 }
 725
 726
 727 bool
 728 DCPContent::can_reference_audio (shared_ptr<const Film> film, string& why_not) const
 729 {
 730         if (audio && audio->stream()) {
 731                 auto const channels = audio->stream()->channels();
 732                 if (channels != film->audio_channels()) {
 733                         why_not = String::compose(_("it has a different number of audio channels than the project; set the project to have %1 channels."), channels);
 734                         return false;
 735                 }
 736         }
 737
 738         auto part = [](shared_ptr<const Content> c) {
 739                 return static_cast<bool>(c->audio) && !c->audio->mapping().mapped_output_channels().empty();
 740         };
 741
 742         if (overlaps(film, part)) {
 743                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 744                 why_not = _("it overlaps other audio content.");
 745                 return false;
 746         }
 747
 748         return can_reference_anything(film, why_not);
 749 }
 750
 751
 752 bool
 753 DCPContent::can_reference_text (shared_ptr<const Film> film, TextType type, string& why_not) const
 754 {
 755         if (_has_non_zero_entry_point[TextType::OPEN_SUBTITLE]) {
 756                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 757                 why_not = _("one of its subtitle reels has a non-zero entry point so it must be re-written.");
 758                 return false;
 759         }
 760
 761         if (_has_non_zero_entry_point[TextType::CLOSED_CAPTION]) {
 762                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 763                 why_not = _("one of its closed caption has a non-zero entry point so it must be re-written.");
 764                 return false;
 765         }
 766
 767         if (trim_start() != dcpomatic::ContentTime()) {
 768                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 769                 why_not = _("it has a start trim so its subtitles or closed captions must be re-written.");
 770                 return false;
 771         }
 772
 773         auto part = [type](shared_ptr<const Content> c) {
 774                 return std::find_if(c->text.begin(), c->text.end(), [type](shared_ptr<const TextContent> t) { return t->type() == type; }) != c->text.end();
 775         };
 776
 777         if (overlaps(film, part)) {
 778                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 779                 why_not = _("it overlaps other text content.");
 780                 return false;
 781         }
 782
 783         return can_reference_anything(film, why_not);
 784 }
 785
 786 void
 787 DCPContent::take_settings_from (shared_ptr<const Content> c)
 788 {
 789         auto dc = dynamic_pointer_cast<const DCPContent>(c);
 790         if (!dc) {
 791                 return;
 792         }
 793
 794         if (this == dc.get()) {
 795                 return;
 796         }
 797
 798         boost::mutex::scoped_lock lm(_mutex);
 799         boost::mutex::scoped_lock lm2(dc->_mutex);
 800
 801         _reference_video = dc->_reference_video;
 802         _reference_audio = dc->_reference_audio;
 803         _reference_text = dc->_reference_text;
 804 }
 805
 806 void
 807 DCPContent::set_cpl (string id)
 808 {
 809         ContentChangeSignaller cc (this, DCPContentProperty::CPL);
 810
 811         {
 812                 boost::mutex::scoped_lock lm (_mutex);
 813                 _cpl = id;
 814         }
 815 }
 816
 817 bool
 818 DCPContent::kdm_timing_window_valid () const
 819 {
 820         if (!_kdm) {
 821                 return true;
 822         }
 823
 824         dcp::LocalTime now;
 825         return _kdm->not_valid_before() < now && now < _kdm->not_valid_after();
 826 }
 827
 828
 829 Resolution
 830 DCPContent::resolution () const
 831 {
 832         if (video->size() && (video->size()->width > 2048 || video->size()->height > 1080)) {
 833                 return Resolution::FOUR_K;
 834         }
 835
 836         return Resolution::TWO_K;
 837 }
 838
 839
 840 void
 841 DCPContent::check_font_ids()
 842 {
 843         if (text.empty()) {
 844                 return;
 845         }
 846
 847         DCPExaminer examiner(shared_from_this(), true);
 848         examiner.add_fonts(text.front());
 849 }
 850
 851
 852 int
 853 DCPContent::active_audio_channels() const
 854 {
 855         return _active_audio_channels.get_value_or(
 856                 (audio && audio->stream()) ? audio->stream()->channels() : 0
 857                 );
 858 }
 859