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
 168 void
 169 DCPContent::read_directory (boost::filesystem::path p)
 170 {
 171         using namespace boost::filesystem;
 172
 173         bool have_assetmap = false;
 174         bool have_metadata = false;
 175
 176         for (auto i: directory_iterator(p)) {
 177                 if (i.path().filename() == "ASSETMAP" || i.path().filename() == "ASSETMAP.xml") {
 178                         have_assetmap = true;
 179                 } else if (i.path().filename() == "metadata.xml") {
 180                         have_metadata = true;
 181                 }
 182         }
 183
 184         if (!have_assetmap) {
 185                 if (!have_metadata) {
 186                         throw DCPError ("No ASSETMAP or ASSETMAP.xml file found: is this a DCP?");
 187                 } else {
 188                         throw ProjectFolderError ();
 189                 }
 190         }
 191
 192         read_sub_directory (p);
 193 }
 194
 195 void
 196 DCPContent::read_sub_directory (boost::filesystem::path p)
 197 {
 198         using namespace boost::filesystem;
 199
 200         LOG_GENERAL ("DCPContent::read_sub_directory reads %1", p.string());
 201         try {
 202                 for (auto i: directory_iterator(p)) {
 203                         if (is_regular_file(i.path())) {
 204                                 LOG_GENERAL ("Inside there's regular file %1", i.path().string());
 205                                 add_path (i.path());
 206                         } else if (is_directory(i.path()) && i.path().filename() != ".AppleDouble") {
 207                                 LOG_GENERAL ("Inside there's directory %1", i.path().string());
 208                                 read_sub_directory (i.path());
 209                         } else {
 210                                 LOG_GENERAL("Ignoring %1 from inside: status is %2", i.path().string(), static_cast<int>(status(i.path()).type()));
 211                         }
 212                 }
 213         } catch (exception& e) {
 214                 LOG_GENERAL("Failed to iterate over %1: %2", p.string(), e.what());
 215         }
 216 }
 217
 218 /** @param film Film, or 0 */
 219 void
 220 DCPContent::examine (shared_ptr<const Film> film, shared_ptr<Job> job)
 221 {
 222         bool const needed_assets = needs_assets ();
 223         bool const needed_kdm = needs_kdm ();
 224         string const old_name = name ();
 225
 226         ContentChangeSignalDespatcher::instance()->suspend();
 227         dcp::ScopeGuard sg = []() {
 228                 ContentChangeSignalDespatcher::instance()->resume();
 229         };
 230
 231         ContentChangeSignaller cc_texts (this, DCPContentProperty::TEXTS);
 232         ContentChangeSignaller cc_assets (this, DCPContentProperty::NEEDS_ASSETS);
 233         ContentChangeSignaller cc_kdm (this, DCPContentProperty::NEEDS_KDM);
 234         ContentChangeSignaller cc_name (this, DCPContentProperty::NAME);
 235
 236         if (job) {
 237                 job->set_progress_unknown ();
 238         }
 239         Content::examine (film, job);
 240
 241         auto examiner = make_shared<DCPExaminer>(shared_from_this(), film ? film->tolerant() : true);
 242
 243         if (examiner->has_video()) {
 244                 {
 245                         boost::mutex::scoped_lock lm (_mutex);
 246                         video = make_shared<VideoContent>(this);
 247                 }
 248                 video->take_from_examiner(film, examiner);
 249                 set_default_colour_conversion ();
 250         }
 251
 252         if (examiner->has_audio()) {
 253                 {
 254                         boost::mutex::scoped_lock lm (_mutex);
 255                         audio = make_shared<AudioContent>(this);
 256                 }
 257                 auto as = make_shared<AudioStream>(examiner->audio_frame_rate(), examiner->audio_length(), examiner->audio_channels(), 24);
 258                 audio->set_stream (as);
 259                 auto m = as->mapping ();
 260                 m.make_default (film ? film->audio_processor() : 0);
 261                 as->set_mapping (m);
 262
 263                 _active_audio_channels = examiner->active_audio_channels();
 264         }
 265
 266         if (examiner->has_atmos()) {
 267                 {
 268                         boost::mutex::scoped_lock lm (_mutex);
 269                         atmos = make_shared<AtmosContent>(this);
 270                 }
 271                 /* Setting length will cause calculations to be made based on edit rate, so that must
 272                  * be set up first otherwise hard-to-spot exceptions will be thrown.
 273                  */
 274                 atmos->set_edit_rate (examiner->atmos_edit_rate());
 275                 atmos->set_length (examiner->atmos_length());
 276         }
 277
 278         vector<shared_ptr<TextContent>> new_text;
 279
 280         for (int i = 0; i < examiner->text_count(TextType::OPEN_SUBTITLE); ++i) {
 281                 auto c = make_shared<TextContent>(this, TextType::OPEN_SUBTITLE, TextType::OPEN_SUBTITLE);
 282                 c->set_language (examiner->open_subtitle_language());
 283                 examiner->add_fonts(c);
 284                 new_text.push_back (c);
 285         }
 286
 287         for (int i = 0; i < examiner->text_count(TextType::CLOSED_CAPTION); ++i) {
 288                 auto c = make_shared<TextContent>(this, TextType::CLOSED_CAPTION, TextType::CLOSED_CAPTION);
 289                 c->set_dcp_track (examiner->dcp_text_track(i));
 290                 examiner->add_fonts(c);
 291                 new_text.push_back (c);
 292         }
 293
 294         {
 295                 boost::mutex::scoped_lock lm (_mutex);
 296                 text = new_text;
 297                 _name = examiner->name ();
 298                 _encrypted = examiner->encrypted ();
 299                 _needs_assets = examiner->needs_assets ();
 300                 _kdm_valid = examiner->kdm_valid ();
 301                 _standard = examiner->standard ();
 302                 _three_d = examiner->three_d ();
 303                 _content_kind = examiner->content_kind ();
 304                 _cpl = examiner->cpl ();
 305                 _reel_lengths = examiner->reel_lengths ();
 306                 for (auto const& i: examiner->markers()) {
 307                         _markers[i.first] = ContentTime(i.second.as_editable_units_ceil(DCPTime::HZ));
 308                 }
 309                 _ratings = examiner->ratings ();
 310                 _content_versions = examiner->content_versions ();
 311         }
 312
 313         if (needed_assets == needs_assets()) {
 314                 cc_assets.abort ();
 315         }
 316
 317         if (needed_kdm == needs_kdm()) {
 318                 cc_kdm.abort ();
 319         }
 320
 321         if (old_name == name()) {
 322                 cc_name.abort ();
 323         }
 324
 325         if (video) {
 326                 video->set_frame_type (_three_d ? VideoFrameType::THREE_D : VideoFrameType::TWO_D);
 327         }
 328 }
 329
 330 string
 331 DCPContent::summary () const
 332 {
 333         boost::mutex::scoped_lock lm (_mutex);
 334         return String::compose (_("%1 [DCP]"), _name);
 335 }
 336
 337 string
 338 DCPContent::technical_summary () const
 339 {
 340         string s = Content::technical_summary() + " - ";
 341         if (video) {
 342                 s += video->technical_summary() + " - ";
 343         }
 344         if (audio) {
 345                 s += audio->technical_summary() + " - ";
 346         }
 347         return s;
 348 }
 349
 350 void
 351 DCPContent::as_xml (xmlpp::Node* node, bool with_paths) const
 352 {
 353         node->add_child("Type")->add_child_text ("DCP");
 354
 355         Content::as_xml (node, with_paths);
 356
 357         if (video) {
 358                 video->as_xml (node);
 359         }
 360
 361         if (audio) {
 362                 audio->as_xml (node);
 363                 node->add_child("AudioFrameRate")->add_child_text (raw_convert<string> (audio->stream()->frame_rate()));
 364                 node->add_child("AudioLength")->add_child_text (raw_convert<string> (audio->stream()->length()));
 365                 audio->stream()->mapping().as_xml (node->add_child("AudioMapping"));
 366         }
 367
 368         for (auto i: text) {
 369                 i->as_xml (node);
 370         }
 371
 372         if (atmos) {
 373                 atmos->as_xml (node);
 374         }
 375
 376         boost::mutex::scoped_lock lm (_mutex);
 377
 378         node->add_child("Name")->add_child_text (_name);
 379         node->add_child("Encrypted")->add_child_text (_encrypted ? "1" : "0");
 380         node->add_child("NeedsAssets")->add_child_text (_needs_assets ? "1" : "0");
 381         if (_kdm) {
 382                 node->add_child("KDM")->add_child_text (_kdm->as_xml ());
 383         }
 384         node->add_child("KDMValid")->add_child_text (_kdm_valid ? "1" : "0");
 385         node->add_child("ReferenceVideo")->add_child_text (_reference_video ? "1" : "0");
 386         node->add_child("ReferenceAudio")->add_child_text (_reference_audio ? "1" : "0");
 387         node->add_child("ReferenceOpenSubtitle")->add_child_text(_reference_text[TextType::OPEN_SUBTITLE] ? "1" : "0");
 388         node->add_child("ReferenceClosedCaption")->add_child_text(_reference_text[TextType::CLOSED_CAPTION] ? "1" : "0");
 389         if (_standard) {
 390                 switch (_standard.get ()) {
 391                 case dcp::Standard::INTEROP:
 392                         node->add_child("Standard")->add_child_text ("Interop");
 393                         break;
 394                 case dcp::Standard::SMPTE:
 395                         node->add_child("Standard")->add_child_text ("SMPTE");
 396                         break;
 397                 default:
 398                         DCPOMATIC_ASSERT (false);
 399                 }
 400         }
 401         node->add_child("ThreeD")->add_child_text (_three_d ? "1" : "0");
 402         if (_content_kind) {
 403                 node->add_child("ContentKind")->add_child_text(_content_kind->name());
 404         }
 405         if (_cpl) {
 406                 node->add_child("CPL")->add_child_text (_cpl.get ());
 407         }
 408         for (auto i: _reel_lengths) {
 409                 node->add_child("ReelLength")->add_child_text (raw_convert<string> (i));
 410         }
 411
 412         for (auto const& i: _markers) {
 413                 auto marker = node->add_child("Marker");
 414                 marker->set_attribute("type", dcp::marker_to_string(i.first));
 415                 marker->add_child_text(raw_convert<string>(i.second.get()));
 416         }
 417
 418         for (auto i: _ratings) {
 419                 auto rating = node->add_child("Rating");
 420                 i.as_xml (rating);
 421         }
 422
 423         for (auto i: _content_versions) {
 424                 node->add_child("ContentVersion")->add_child_text(i);
 425         }
 426
 427         if (_active_audio_channels) {
 428                 node->add_child("ActiveAudioChannels")->add_child_text(raw_convert<string>(*_active_audio_channels));
 429         }
 430 }
 431
 432 DCPTime
 433 DCPContent::full_length (shared_ptr<const Film> film) const
 434 {
 435         if (!video) {
 436                 return {};
 437         }
 438         FrameRateChange const frc (film, shared_from_this());
 439         return DCPTime::from_frames (llrint(video->length() * frc.factor()), film->video_frame_rate());
 440 }
 441
 442 DCPTime
 443 DCPContent::approximate_length () const
 444 {
 445         if (!video) {
 446                 return {};
 447         }
 448         return DCPTime::from_frames (video->length(), 24);
 449 }
 450
 451 string
 452 DCPContent::identifier () const
 453 {
 454         string s = Content::identifier() + "_";
 455
 456         if (video) {
 457                 s += video->identifier() + "_";
 458         }
 459
 460         for (auto i: text) {
 461                 s += i->identifier () + " ";
 462         }
 463
 464         boost::mutex::scoped_lock lm(_mutex);
 465
 466         s += string (_reference_video ? "1" : "0");
 467         for (auto text: _reference_text) {
 468                 s += string(text ? "1" : "0");
 469         }
 470         return s;
 471 }
 472
 473 void
 474 DCPContent::add_kdm (dcp::EncryptedKDM k)
 475 {
 476         _kdm = k;
 477 }
 478
 479 void
 480 DCPContent::add_ov (boost::filesystem::path ov)
 481 {
 482         read_directory (ov);
 483 }
 484
 485 bool
 486 DCPContent::can_be_played () const
 487 {
 488         return !needs_kdm() && !needs_assets();
 489 }
 490
 491 bool
 492 DCPContent::needs_kdm () const
 493 {
 494         boost::mutex::scoped_lock lm (_mutex);
 495         return _encrypted && !_kdm_valid;
 496 }
 497
 498 bool
 499 DCPContent::needs_assets () const
 500 {
 501         boost::mutex::scoped_lock lm (_mutex);
 502         return _needs_assets;
 503 }
 504
 505 vector<boost::filesystem::path>
 506 DCPContent::directories () const
 507 {
 508         return dcp::DCP::directories_from_files (paths());
 509 }
 510
 511 void
 512 DCPContent::add_properties (shared_ptr<const Film> film, list<UserProperty>& p) const
 513 {
 514         Content::add_properties (film, p);
 515         if (video) {
 516                 video->add_properties (p);
 517         }
 518         if (audio) {
 519                 audio->add_properties (film, p);
 520         }
 521 }
 522
 523 void
 524 DCPContent::set_default_colour_conversion ()
 525 {
 526         /* Default to no colour conversion for DCPs */
 527         if (video) {
 528                 video->unset_colour_conversion ();
 529         }
 530 }
 531
 532 void
 533 DCPContent::set_reference_video (bool r)
 534 {
 535         ContentChangeSignaller cc (this, DCPContentProperty::REFERENCE_VIDEO);
 536
 537         {
 538                 boost::mutex::scoped_lock lm (_mutex);
 539                 _reference_video = r;
 540         }
 541 }
 542
 543 void
 544 DCPContent::set_reference_audio (bool r)
 545 {
 546         ContentChangeSignaller cc (this, DCPContentProperty::REFERENCE_AUDIO);
 547
 548         {
 549                 boost::mutex::scoped_lock lm (_mutex);
 550                 _reference_audio = r;
 551         }
 552 }
 553
 554 void
 555 DCPContent::set_reference_text (TextType type, bool r)
 556 {
 557         ContentChangeSignaller cc (this, DCPContentProperty::REFERENCE_TEXT);
 558
 559         {
 560                 boost::mutex::scoped_lock lm (_mutex);
 561                 _reference_text[type] = r;
 562         }
 563 }
 564
 565 list<DCPTimePeriod>
 566 DCPContent::reels (shared_ptr<const Film> film) const
 567 {
 568         auto reel_lengths = _reel_lengths;
 569         if (reel_lengths.empty()) {
 570                 /* Old metadata with no reel lengths; get them here instead */
 571                 try {
 572                         scoped_ptr<DCPExaminer> examiner (new DCPExaminer(shared_from_this(), film->tolerant()));
 573                         reel_lengths = examiner->reel_lengths ();
 574                 } catch (...) {
 575                         /* Could not examine the DCP; guess reels */
 576                         reel_lengths.push_back (length_after_trim(film).frames_round(film->video_frame_rate()));
 577                 }
 578         }
 579
 580         list<DCPTimePeriod> p;
 581
 582         /* This content's frame rate must be the same as the output DCP rate, so we can
 583            convert `directly' from ContentTime to DCPTime.
 584         */
 585
 586         /* The starting point of this content on the timeline */
 587         auto pos = position() - DCPTime (trim_start().get());
 588
 589         for (auto i: reel_lengths) {
 590                 /* This reel runs from `pos' to `to' */
 591                 DCPTime const to = pos + DCPTime::from_frames (i, film->video_frame_rate());
 592                 if (to > position()) {
 593                         p.push_back (DCPTimePeriod(max(position(), pos), min(end(film), to)));
 594                         if (to > end(film)) {
 595                                 break;
 596                         }
 597                 }
 598                 pos = to;
 599         }
 600
 601         return p;
 602 }
 603
 604 list<DCPTime>
 605 DCPContent::reel_split_points (shared_ptr<const Film> film) const
 606 {
 607         list<DCPTime> s;
 608         for (auto i: reels(film)) {
 609                 s.push_back (i.from);
 610         }
 611         return s;
 612 }
 613
 614 bool
 615 DCPContent::can_reference (shared_ptr<const Film> film, function<bool (shared_ptr<const Content>)> part, string overlapping, string& why_not) const
 616 {
 617         /* We must be using the same standard as the film */
 618         if (_standard) {
 619                 if (_standard.get() == dcp::Standard::INTEROP && !film->interop()) {
 620                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 621                         why_not = _("it is Interop and the film is set to SMPTE.");
 622                         return false;
 623                 } else if (_standard.get() == dcp::Standard::SMPTE && film->interop()) {
 624                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 625                         why_not = _("it is SMPTE and the film is set to Interop.");
 626                         return false;
 627                 }
 628         }
 629
 630         /* And the same frame rate */
 631         if (!video_frame_rate() || (lrint(video_frame_rate().get()) != film->video_frame_rate())) {
 632                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 633                 why_not = _("it has a different frame rate to the film.");
 634                 return false;
 635         }
 636
 637         auto const fr = film->reels ();
 638
 639         list<DCPTimePeriod> reel_list;
 640         try {
 641                 reel_list = reels (film);
 642         } catch (dcp::ReadError &) {
 643                 /* We couldn't read the DCP; it's probably missing */
 644                 return false;
 645         } catch (dcp::KDMDecryptionError &) {
 646                 /* We have an incorrect KDM */
 647                 return false;
 648         }
 649
 650         /* fr must contain reels().  It can also contain other reels, but it must at
 651            least contain reels().
 652         */
 653         for (auto i: reel_list) {
 654                 if (find (fr.begin(), fr.end(), i) == fr.end ()) {
 655                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 656                         why_not = _("its reel lengths differ from those in the film; set the reel mode to 'split by video content'.");
 657                         return false;
 658                 }
 659         }
 660
 661         auto a = overlaps (film, film->content(), part, position(), end(film));
 662         if (a.size() != 1 || a.front().get() != this) {
 663                 why_not = overlapping;
 664                 return false;
 665         }
 666
 667         return true;
 668 }
 669
 670
 671 bool
 672 DCPContent::can_reference_video (shared_ptr<const Film> film, string& why_not) const
 673 {
 674         if (!video) {
 675                 why_not = _("There is no video in this DCP");
 676                 return false;
 677         }
 678
 679         if (film->resolution() != resolution()) {
 680                 if (resolution() == Resolution::FOUR_K) {
 681                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 682                         why_not = _("it is 4K and the film is 2K.");
 683                 } else {
 684                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 685                         why_not = _("it is 2K and the film is 4K.");
 686                 }
 687                 return false;
 688         } else if (film->frame_size() != video->size()) {
 689                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 690                 why_not = _("its video frame size differs from the film's.");
 691                 return false;
 692         }
 693
 694         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 695         return can_reference(
 696                 film,
 697                 [](shared_ptr<const Content> c) {
 698                         return static_cast<bool>(c->video) && c->video->use();
 699                 },
 700                 _("it overlaps other video content; remove the other content."),
 701                 why_not
 702         );
 703 }
 704
 705
 706 bool
 707 DCPContent::can_reference_audio (shared_ptr<const Film> film, string& why_not) const
 708 {
 709         shared_ptr<DCPDecoder> decoder;
 710         try {
 711                 decoder = make_shared<DCPDecoder>(film, shared_from_this(), false, film->tolerant(), shared_ptr<DCPDecoder>());
 712         } catch (dcp::ReadError &) {
 713                 /* We couldn't read the DCP, so it's probably missing */
 714                 return false;
 715         } catch (DCPError &) {
 716                 /* We couldn't read the DCP, so it's probably missing */
 717                 return false;
 718         } catch (dcp::KDMDecryptionError &) {
 719                 /* We have an incorrect KDM */
 720                 return false;
 721         }
 722
 723         if (audio && audio->stream()) {
 724                 auto const channels = audio->stream()->channels();
 725                 if (channels != film->audio_channels()) {
 726                         why_not = String::compose(_("it has a different number of audio channels than the project; set the project to have %1 channels."), channels);
 727                         return false;
 728                 }
 729         }
 730
 731         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 732         return can_reference(
 733                 film, [](shared_ptr<const Content> c) {
 734                         return static_cast<bool>(c->audio) && !c->audio->mapping().mapped_output_channels().empty();
 735                 },
 736                 _("it overlaps other audio content; remove the other content."),
 737                 why_not
 738         );
 739 }
 740
 741
 742 bool
 743 DCPContent::can_reference_text (shared_ptr<const Film> film, TextType type, string& why_not) const
 744 {
 745         shared_ptr<DCPDecoder> decoder;
 746         try {
 747                 decoder = make_shared<DCPDecoder>(film, shared_from_this(), false, film->tolerant(), shared_ptr<DCPDecoder>());
 748         } catch (dcp::ReadError &) {
 749                 /* We couldn't read the DCP, so it's probably missing */
 750                 return false;
 751         } catch (DCPError &) {
 752                 /* We couldn't read the DCP, so it's probably missing */
 753                 return false;
 754         } catch (dcp::KDMDecryptionError &) {
 755                 /* We have an incorrect KDM */
 756                 return false;
 757         }
 758
 759         for (auto i: decoder->reels()) {
 760                 if (type == TextType::OPEN_SUBTITLE) {
 761                         if (i->main_subtitle() && i->main_subtitle()->entry_point().get_value_or(0) != 0) {
 762                                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 763                                 why_not = _("one of its subtitle reels has a non-zero entry point so it must be re-written.");
 764                                 return false;
 765                         }
 766                 }
 767                 if (type == TextType::CLOSED_CAPTION) {
 768                         for (auto j: i->closed_captions()) {
 769                                 if (j->entry_point().get_value_or(0) != 0) {
 770                                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 771                                         why_not = _("one of its closed caption has a non-zero entry point so it must be re-written.");
 772                                         return false;
 773                                 }
 774                         }
 775                 }
 776         }
 777
 778         if (trim_start() != dcpomatic::ContentTime()) {
 779                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 780                 why_not = _("it has a start trim so its subtitles or closed captions must be re-written.");
 781                 return false;
 782         }
 783
 784         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 785         return can_reference(
 786                 film,
 787                 [type](shared_ptr<const Content> c) {
 788                         return std::find_if(c->text.begin(), c->text.end(), [type](shared_ptr<const TextContent> t) { return t->type() == type; }) != c->text.end();
 789                 },
 790                 _("they overlap other text content; remove the other content."),
 791                 why_not
 792         );
 793 }
 794
 795 void
 796 DCPContent::take_settings_from (shared_ptr<const Content> c)
 797 {
 798         auto dc = dynamic_pointer_cast<const DCPContent>(c);
 799         if (!dc) {
 800                 return;
 801         }
 802
 803         if (this == dc.get()) {
 804                 return;
 805         }
 806
 807         boost::mutex::scoped_lock lm(_mutex);
 808         boost::mutex::scoped_lock lm2(dc->_mutex);
 809
 810         _reference_video = dc->_reference_video;
 811         _reference_audio = dc->_reference_audio;
 812         _reference_text = dc->_reference_text;
 813 }
 814
 815 void
 816 DCPContent::set_cpl (string id)
 817 {
 818         ContentChangeSignaller cc (this, DCPContentProperty::CPL);
 819
 820         {
 821                 boost::mutex::scoped_lock lm (_mutex);
 822                 _cpl = id;
 823         }
 824 }
 825
 826 bool
 827 DCPContent::kdm_timing_window_valid () const
 828 {
 829         if (!_kdm) {
 830                 return true;
 831         }
 832
 833         dcp::LocalTime now;
 834         return _kdm->not_valid_before() < now && now < _kdm->not_valid_after();
 835 }
 836
 837
 838 Resolution
 839 DCPContent::resolution () const
 840 {
 841         if (video->size() && (video->size()->width > 2048 || video->size()->height > 1080)) {
 842                 return Resolution::FOUR_K;
 843         }
 844
 845         return Resolution::TWO_K;
 846 }
 847
 848
 849 void
 850 DCPContent::check_font_ids()
 851 {
 852         if (text.empty()) {
 853                 return;
 854         }
 855
 856         DCPExaminer examiner(shared_from_this(), true);
 857         examiner.add_fonts(text.front());
 858 }
 859
 860
 861 int
 862 DCPContent::active_audio_channels() const
 863 {
 864         return _active_audio_channels.get_value_or(
 865                 (audio && audio->stream()) ? audio->stream()->channels() : 0
 866                 );
 867 }
 868