src/lib/dcp_content.cc

   1 /*
   2     Copyright (C) 2014-2018 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 "dcp_content.h"
  22 #include "video_content.h"
  23 #include "audio_content.h"
  24 #include "dcp_examiner.h"
  25 #include "job.h"
  26 #include "film.h"
  27 #include "config.h"
  28 #include "overlaps.h"
  29 #include "compose.hpp"
  30 #include "dcp_decoder.h"
  31 #include "log.h"
  32 #include "dcpomatic_log.h"
  33 #include "text_content.h"
  34 #include <dcp/dcp.h>
  35 #include <dcp/raw_convert.h>
  36 #include <dcp/exceptions.h>
  37 #include <dcp/reel_picture_asset.h>
  38 #include <dcp/reel.h>
  39 #include <libxml++/libxml++.h>
  40 #include <boost/foreach.hpp>
  41 #include <iterator>
  42 #include <iostream>
  43
  44 #include "i18n.h"
  45
  46 using std::string;
  47 using std::cout;
  48 using std::distance;
  49 using std::pair;
  50 using std::vector;
  51 using std::list;
  52 using boost::shared_ptr;
  53 using boost::scoped_ptr;
  54 using boost::optional;
  55 using boost::function;
  56 using boost::dynamic_pointer_cast;
  57 using dcp::raw_convert;
  58
  59 int const DCPContentProperty::NEEDS_ASSETS       = 600;
  60 int const DCPContentProperty::NEEDS_KDM          = 601;
  61 int const DCPContentProperty::REFERENCE_VIDEO    = 602;
  62 int const DCPContentProperty::REFERENCE_AUDIO    = 603;
  63 int const DCPContentProperty::REFERENCE_TEXT     = 604;
  64 int const DCPContentProperty::NAME               = 605;
  65 int const DCPContentProperty::TEXTS              = 606;
  66 int const DCPContentProperty::CPL                = 607;
  67
  68 DCPContent::DCPContent (boost::filesystem::path p)
  69         : _encrypted (false)
  70         , _needs_assets (false)
  71         , _kdm_valid (false)
  72         , _reference_video (false)
  73         , _reference_audio (false)
  74         , _three_d (false)
  75 {
  76         LOG_GENERAL ("Creating DCP content from %1", p.string());
  77
  78         read_directory (p);
  79         set_default_colour_conversion ();
  80
  81         for (int i = 0; i < TEXT_COUNT; ++i) {
  82                 _reference_text[i] = false;
  83         }
  84 }
  85
  86 DCPContent::DCPContent (cxml::ConstNodePtr node, int version)
  87         : Content (node)
  88 {
  89         video = VideoContent::from_xml (this, node, version);
  90         audio = AudioContent::from_xml (this, node, version);
  91         text = TextContent::from_xml (this, node, version);
  92
  93         for (int i = 0; i < TEXT_COUNT; ++i) {
  94                 _reference_text[i] = false;
  95         }
  96
  97         if (video && audio) {
  98                 audio->set_stream (
  99                         AudioStreamPtr (
 100                                 new AudioStream (
 101                                         node->number_child<int> ("AudioFrameRate"),
 102                                         /* AudioLength was not present in some old metadata versions */
 103                                         node->optional_number_child<Frame>("AudioLength").get_value_or (
 104                                                 video->length() * node->number_child<int>("AudioFrameRate") / video_frame_rate().get()
 105                                                 ),
 106                                         AudioMapping (node->node_child ("AudioMapping"), version)
 107                                         )
 108                                 )
 109                         );
 110         }
 111
 112         _name = node->string_child ("Name");
 113         _encrypted = node->bool_child ("Encrypted");
 114         _needs_assets = node->optional_bool_child("NeedsAssets").get_value_or (false);
 115         if (node->optional_node_child ("KDM")) {
 116                 _kdm = dcp::EncryptedKDM (node->string_child ("KDM"));
 117         }
 118         _kdm_valid = node->bool_child ("KDMValid");
 119         _reference_video = node->optional_bool_child ("ReferenceVideo").get_value_or (false);
 120         _reference_audio = node->optional_bool_child ("ReferenceAudio").get_value_or (false);
 121         if (version >= 37) {
 122                 _reference_text[TEXT_OPEN_SUBTITLE] = node->optional_bool_child("ReferenceOpenSubtitle").get_value_or(false);
 123                 _reference_text[TEXT_CLOSED_CAPTION] = node->optional_bool_child("ReferenceClosedCaption").get_value_or(false);
 124         } else {
 125                 _reference_text[TEXT_OPEN_SUBTITLE] = node->optional_bool_child("ReferenceSubtitle").get_value_or(false);
 126                 _reference_text[TEXT_CLOSED_CAPTION] = false;
 127         }
 128         if (node->optional_string_child("Standard")) {
 129                 string const s = node->optional_string_child("Standard").get();
 130                 if (s == "Interop") {
 131                         _standard = dcp::INTEROP;
 132                 } else if (s == "SMPTE") {
 133                         _standard = dcp::SMPTE;
 134                 } else {
 135                         DCPOMATIC_ASSERT (false);
 136                 }
 137         }
 138         _three_d = node->optional_bool_child("ThreeD").get_value_or (false);
 139
 140         optional<string> ck = node->optional_string_child("ContentKind");
 141         if (ck) {
 142                 _content_kind = dcp::content_kind_from_string (*ck);
 143         }
 144         _cpl = node->optional_string_child("CPL");
 145         BOOST_FOREACH (cxml::ConstNodePtr i, node->node_children("ReelLength")) {
 146                 _reel_lengths.push_back (raw_convert<int64_t> (i->content ()));
 147         }
 148 }
 149
 150 void
 151 DCPContent::read_directory (boost::filesystem::path p)
 152 {
 153         LOG_GENERAL ("DCPContent::read_directory reads %1", p.string());
 154         for (boost::filesystem::directory_iterator i(p); i != boost::filesystem::directory_iterator(); ++i) {
 155                 if (boost::filesystem::is_regular_file (i->path())) {
 156                         LOG_GENERAL ("Inside there's regular file %1", i->path().string());
 157                         add_path (i->path());
 158                 } else if (boost::filesystem::is_directory (i->path ())) {
 159                         LOG_GENERAL ("Inside there's directory %1", i->path().string());
 160                         read_directory (i->path());
 161                 }
 162         }
 163
 164         bool have_assetmap = false;
 165         BOOST_FOREACH (boost::filesystem::path i, paths()) {
 166                 if (i.filename() == "ASSETMAP" || i.filename() == "ASSETMAP.xml") {
 167                         have_assetmap = true;
 168                 }
 169         }
 170
 171         if (!have_assetmap) {
 172                 throw DCPError ("No ASSETMAP or ASSETMAP.xml file found: is this a DCP?");
 173         }
 174 }
 175
 176 void
 177 DCPContent::examine (shared_ptr<const Film> film, shared_ptr<Job> job)
 178 {
 179         bool const needed_assets = needs_assets ();
 180         bool const needed_kdm = needs_kdm ();
 181         string const old_name = name ();
 182         int const old_texts = text.size ();
 183
 184         ChangeSignaller<Content> cc_texts (this, DCPContentProperty::TEXTS);
 185         ChangeSignaller<Content> cc_assets (this, DCPContentProperty::NEEDS_ASSETS);
 186         ChangeSignaller<Content> cc_kdm (this, DCPContentProperty::NEEDS_KDM);
 187         ChangeSignaller<Content> cc_name (this, DCPContentProperty::NAME);
 188         ChangeSignaller<Content> cc_streams (this, AudioContentProperty::STREAMS);
 189
 190         if (job) {
 191                 job->set_progress_unknown ();
 192         }
 193         Content::examine (film, job);
 194
 195         shared_ptr<DCPExaminer> examiner (new DCPExaminer (shared_from_this ()));
 196
 197         if (examiner->has_video()) {
 198                 {
 199                         boost::mutex::scoped_lock lm (_mutex);
 200                         video.reset (new VideoContent (this));
 201                 }
 202                 video->take_from_examiner (examiner);
 203                 set_default_colour_conversion ();
 204         }
 205
 206         if (examiner->has_audio()) {
 207                 ChangeSignaller<Content> cc (this, AudioContentProperty::STREAMS);
 208                 {
 209                         boost::mutex::scoped_lock lm (_mutex);
 210                         audio.reset (new AudioContent (this));
 211                 }
 212                 AudioStreamPtr as (new AudioStream (examiner->audio_frame_rate(), examiner->audio_length(), examiner->audio_channels()));
 213                 audio->set_stream (as);
 214                 AudioMapping m = as->mapping ();
 215                 film->make_audio_mapping_default (m);
 216                 as->set_mapping (m);
 217         }
 218
 219         int texts = 0;
 220         {
 221                 boost::mutex::scoped_lock lm (_mutex);
 222                 _name = examiner->name ();
 223                 for (int i = 0; i < TEXT_COUNT; ++i) {
 224                         if (examiner->has_text(static_cast<TextType>(i))) {
 225                                 text.push_back (shared_ptr<TextContent>(new TextContent(this, static_cast<TextType>(i), static_cast<TextType>(i))));
 226                         }
 227                 }
 228                 texts = text.size ();
 229                 _encrypted = examiner->encrypted ();
 230                 _needs_assets = examiner->needs_assets ();
 231                 _kdm_valid = examiner->kdm_valid ();
 232                 _standard = examiner->standard ();
 233                 _three_d = examiner->three_d ();
 234                 _content_kind = examiner->content_kind ();
 235                 _cpl = examiner->cpl ();
 236                 _reel_lengths = examiner->reel_lengths ();
 237         }
 238
 239         if (old_texts == texts) {
 240                 cc_texts.abort ();
 241         }
 242
 243         if (needed_assets == needs_assets()) {
 244                 cc_assets.abort ();
 245         }
 246
 247         if (needed_kdm == needs_kdm()) {
 248                 cc_kdm.abort ();
 249         }
 250
 251         if (old_name == name()) {
 252                 cc_name.abort ();
 253         }
 254
 255         if (video) {
 256                 video->set_frame_type (_three_d ? VIDEO_FRAME_TYPE_3D : VIDEO_FRAME_TYPE_2D);
 257         }
 258 }
 259
 260 string
 261 DCPContent::summary () const
 262 {
 263         boost::mutex::scoped_lock lm (_mutex);
 264         return String::compose (_("%1 [DCP]"), _name);
 265 }
 266
 267 string
 268 DCPContent::technical_summary () const
 269 {
 270         string s = Content::technical_summary() + " - ";
 271         if (video) {
 272                 s += video->technical_summary() + " - ";
 273         }
 274         if (audio) {
 275                 s += audio->technical_summary() + " - ";
 276         }
 277         return s;
 278 }
 279
 280 void
 281 DCPContent::as_xml (xmlpp::Node* node, bool with_paths) const
 282 {
 283         node->add_child("Type")->add_child_text ("DCP");
 284
 285         Content::as_xml (node, with_paths);
 286
 287         if (video) {
 288                 video->as_xml (node);
 289         }
 290
 291         if (audio) {
 292                 audio->as_xml (node);
 293                 node->add_child("AudioFrameRate")->add_child_text (raw_convert<string> (audio->stream()->frame_rate()));
 294                 node->add_child("AudioLength")->add_child_text (raw_convert<string> (audio->stream()->length()));
 295                 audio->stream()->mapping().as_xml (node->add_child("AudioMapping"));
 296         }
 297
 298         BOOST_FOREACH (shared_ptr<TextContent> i, text) {
 299                 i->as_xml (node);
 300         }
 301
 302         boost::mutex::scoped_lock lm (_mutex);
 303         node->add_child("Name")->add_child_text (_name);
 304         node->add_child("Encrypted")->add_child_text (_encrypted ? "1" : "0");
 305         node->add_child("NeedsAssets")->add_child_text (_needs_assets ? "1" : "0");
 306         if (_kdm) {
 307                 node->add_child("KDM")->add_child_text (_kdm->as_xml ());
 308         }
 309         node->add_child("KDMValid")->add_child_text (_kdm_valid ? "1" : "0");
 310         node->add_child("ReferenceVideo")->add_child_text (_reference_video ? "1" : "0");
 311         node->add_child("ReferenceAudio")->add_child_text (_reference_audio ? "1" : "0");
 312         node->add_child("ReferenceOpenSubtitle")->add_child_text(_reference_text[TEXT_OPEN_SUBTITLE] ? "1" : "0");
 313         node->add_child("ReferenceClosedCaption")->add_child_text(_reference_text[TEXT_CLOSED_CAPTION] ? "1" : "0");
 314         if (_standard) {
 315                 switch (_standard.get ()) {
 316                 case dcp::INTEROP:
 317                         node->add_child("Standard")->add_child_text ("Interop");
 318                         break;
 319                 case dcp::SMPTE:
 320                         node->add_child("Standard")->add_child_text ("SMPTE");
 321                         break;
 322                 default:
 323                         DCPOMATIC_ASSERT (false);
 324                 }
 325         }
 326         node->add_child("ThreeD")->add_child_text (_three_d ? "1" : "0");
 327         if (_content_kind) {
 328                 node->add_child("ContentKind")->add_child_text(dcp::content_kind_to_string(*_content_kind));
 329         }
 330         if (_cpl) {
 331                 node->add_child("CPL")->add_child_text (_cpl.get ());
 332         }
 333         BOOST_FOREACH (int64_t i, _reel_lengths) {
 334                 node->add_child("ReelLength")->add_child_text (raw_convert<string> (i));
 335         }
 336 }
 337
 338 DCPTime
 339 DCPContent::full_length (shared_ptr<const Film> film) const
 340 {
 341         if (!video) {
 342                 return DCPTime();
 343         }
 344         FrameRateChange const frc (film, shared_from_this());
 345         return DCPTime::from_frames (llrint(video->length() * frc.factor()), film->video_frame_rate());
 346 }
 347
 348 string
 349 DCPContent::identifier () const
 350 {
 351         string s = Content::identifier() + "_";
 352
 353         if (video) {
 354                 s += video->identifier() + "_";
 355         }
 356
 357         BOOST_FOREACH (shared_ptr<TextContent> i, text) {
 358                 s += i->identifier () + " ";
 359         }
 360
 361         s += string (_reference_video ? "1" : "0");
 362         for (int i = 0; i < TEXT_COUNT; ++i) {
 363                 s += string (_reference_text[i] ? "1" : "0");
 364         }
 365         return s;
 366 }
 367
 368 void
 369 DCPContent::add_kdm (dcp::EncryptedKDM k)
 370 {
 371         _kdm = k;
 372 }
 373
 374 void
 375 DCPContent::add_ov (boost::filesystem::path ov)
 376 {
 377         read_directory (ov);
 378 }
 379
 380 bool
 381 DCPContent::can_be_played () const
 382 {
 383         return !needs_kdm() && !needs_assets();
 384 }
 385
 386 bool
 387 DCPContent::needs_kdm () const
 388 {
 389         boost::mutex::scoped_lock lm (_mutex);
 390         return _encrypted && !_kdm_valid;
 391 }
 392
 393 bool
 394 DCPContent::needs_assets () const
 395 {
 396         boost::mutex::scoped_lock lm (_mutex);
 397         return _needs_assets;
 398 }
 399
 400 vector<boost::filesystem::path>
 401 DCPContent::directories () const
 402 {
 403         return dcp::DCP::directories_from_files (paths());
 404 }
 405
 406 void
 407 DCPContent::add_properties (shared_ptr<const Film> film, list<UserProperty>& p) const
 408 {
 409         Content::add_properties (p);
 410         if (video) {
 411                 video->add_properties (p);
 412         }
 413         if (audio) {
 414                 audio->add_properties (film, p);
 415         }
 416 }
 417
 418 void
 419 DCPContent::set_default_colour_conversion ()
 420 {
 421         /* Default to no colour conversion for DCPs */
 422         if (video) {
 423                 video->unset_colour_conversion ();
 424         }
 425 }
 426
 427 void
 428 DCPContent::set_reference_video (bool r)
 429 {
 430         ChangeSignaller<Content> cc (this, DCPContentProperty::REFERENCE_VIDEO);
 431
 432         {
 433                 boost::mutex::scoped_lock lm (_mutex);
 434                 _reference_video = r;
 435         }
 436 }
 437
 438 void
 439 DCPContent::set_reference_audio (bool r)
 440 {
 441         ChangeSignaller<Content> cc (this, DCPContentProperty::REFERENCE_AUDIO);
 442
 443         {
 444                 boost::mutex::scoped_lock lm (_mutex);
 445                 _reference_audio = r;
 446         }
 447 }
 448
 449 void
 450 DCPContent::set_reference_text (TextType type, bool r)
 451 {
 452         ChangeSignaller<Content> cc (this, DCPContentProperty::REFERENCE_TEXT);
 453
 454         {
 455                 boost::mutex::scoped_lock lm (_mutex);
 456                 _reference_text[type] = r;
 457         }
 458 }
 459
 460 list<DCPTimePeriod>
 461 DCPContent::reels (shared_ptr<const Film> film) const
 462 {
 463         list<int64_t> reel_lengths = _reel_lengths;
 464         if (reel_lengths.empty ()) {
 465                 /* Old metadata with no reel lengths; get them here instead */
 466                 try {
 467                         scoped_ptr<DCPExaminer> examiner (new DCPExaminer (shared_from_this()));
 468                         reel_lengths = examiner->reel_lengths ();
 469                 } catch (...) {
 470                         /* Could not examine the DCP; guess reels */
 471                         reel_lengths.push_back (length_after_trim(film).frames_round(film->video_frame_rate()));
 472                 }
 473         }
 474
 475         list<DCPTimePeriod> p;
 476
 477         /* This content's frame rate must be the same as the output DCP rate, so we can
 478            convert `directly' from ContentTime to DCPTime.
 479         */
 480
 481         /* The starting point of this content on the timeline */
 482         DCPTime pos = position() - DCPTime (trim_start().get());
 483
 484         BOOST_FOREACH (int64_t i, reel_lengths) {
 485                 /* This reel runs from `pos' to `to' */
 486                 DCPTime const to = pos + DCPTime::from_frames (i, film->video_frame_rate());
 487                 if (to > position()) {
 488                         p.push_back (DCPTimePeriod (max(position(), pos), min(end(film), to)));
 489                         if (to > end(film)) {
 490                                 break;
 491                         }
 492                 }
 493                 pos = to;
 494         }
 495
 496         return p;
 497 }
 498
 499 list<DCPTime>
 500 DCPContent::reel_split_points (shared_ptr<const Film> film) const
 501 {
 502         list<DCPTime> s;
 503         BOOST_FOREACH (DCPTimePeriod i, reels(film)) {
 504                 s.push_back (i.from);
 505         }
 506         return s;
 507 }
 508
 509 bool
 510 DCPContent::can_reference (shared_ptr<const Film> film, function<bool (shared_ptr<const Content>)> part, string overlapping, string& why_not) const
 511 {
 512         /* We must be using the same standard as the film */
 513         if (_standard) {
 514                 if (_standard.get() == dcp::INTEROP && !film->interop()) {
 515                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 516                         why_not = _("it is Interop and the film is set to SMPTE.");
 517                         return false;
 518                 } else if (_standard.get() == dcp::SMPTE && film->interop()) {
 519                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 520                         why_not = _("it is SMPTE and the film is set to Interop.");
 521                         return false;
 522                 }
 523         }
 524
 525         /* And the same frame rate */
 526         if (!video_frame_rate() || (lrint(video_frame_rate().get()) != film->video_frame_rate())) {
 527                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 528                 why_not = _("it has a different frame rate to the film.");
 529                 return false;
 530         }
 531
 532         list<DCPTimePeriod> const fr = film->reels ();
 533
 534         list<DCPTimePeriod> reel_list;
 535         try {
 536                 reel_list = reels (film);
 537         } catch (dcp::DCPReadError) {
 538                 /* We couldn't read the DCP; it's probably missing */
 539                 return false;
 540         } catch (dcp::KDMDecryptionError) {
 541                 /* We have an incorrect KDM */
 542                 return false;
 543         }
 544
 545         /* fr must contain reels().  It can also contain other reels, but it must at
 546            least contain reels().
 547         */
 548         BOOST_FOREACH (DCPTimePeriod i, reel_list) {
 549                 if (find (fr.begin(), fr.end(), i) == fr.end ()) {
 550                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 551                         why_not = _("its reel lengths differ from those in the film; set the reel mode to 'split by video content'.");
 552                         return false;
 553                 }
 554         }
 555
 556         ContentList a = overlaps (film, film->content(), part, position(), end(film));
 557         if (a.size() != 1 || a.front().get() != this) {
 558                 why_not = overlapping;
 559                 return false;
 560         }
 561
 562         return true;
 563 }
 564
 565 static
 566 bool check_video (shared_ptr<const Content> c)
 567 {
 568         return static_cast<bool>(c->video);
 569 }
 570
 571 bool
 572 DCPContent::can_reference_video (shared_ptr<const Film> film, string& why_not) const
 573 {
 574         if (!video) {
 575                 why_not = _("There is no video in this DCP");
 576                 return false;
 577         }
 578
 579         Resolution video_res = RESOLUTION_2K;
 580         if (video->size().width > 2048 || video->size().height > 1080) {
 581                 video_res = RESOLUTION_4K;
 582         }
 583
 584         if (film->resolution() != video_res) {
 585                 if (video_res == RESOLUTION_4K) {
 586                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 587                         why_not = _("it is 4K and the film is 2K.");
 588                 } else {
 589                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 590                         why_not = _("it is 2K and the film is 4K.");
 591                 }
 592                 return false;
 593         } else if (film->frame_size() != video->size()) {
 594                 /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 595                 why_not = _("its video frame size differs from the film's.");
 596                 return false;
 597         }
 598
 599         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 600         return can_reference (film, bind (&check_video, _1), _("it overlaps other video content; remove the other content."), why_not);
 601 }
 602
 603 static
 604 bool check_audio (shared_ptr<const Content> c)
 605 {
 606         return static_cast<bool>(c->audio);
 607 }
 608
 609 bool
 610 DCPContent::can_reference_audio (shared_ptr<const Film> film, string& why_not) const
 611 {
 612         shared_ptr<DCPDecoder> decoder;
 613         try {
 614                 decoder.reset (new DCPDecoder (film, shared_from_this(), false));
 615         } catch (dcp::DCPReadError) {
 616                 /* We couldn't read the DCP, so it's probably missing */
 617                 return false;
 618         } catch (DCPError) {
 619                 /* We couldn't read the DCP, so it's probably missing */
 620                 return false;
 621         } catch (dcp::KDMDecryptionError) {
 622                 /* We have an incorrect KDM */
 623                 return false;
 624         }
 625
 626         BOOST_FOREACH (shared_ptr<dcp::Reel> i, decoder->reels()) {
 627                 if (!i->main_sound()) {
 628                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 629                         why_not = _("it does not have sound in all its reels.");
 630                         return false;
 631                 }
 632         }
 633
 634         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 635         return can_reference (film, bind (&check_audio, _1), _("it overlaps other audio content; remove the other content."), why_not);
 636 }
 637
 638 static
 639 bool check_text (shared_ptr<const Content> c)
 640 {
 641         return !c->text.empty();
 642 }
 643
 644 bool
 645 DCPContent::can_reference_text (shared_ptr<const Film> film, TextType type, string& why_not) const
 646 {
 647         shared_ptr<DCPDecoder> decoder;
 648         try {
 649                 decoder.reset (new DCPDecoder (film, shared_from_this(), false));
 650         } catch (dcp::DCPReadError) {
 651
 652                 /* We couldn't read the DCP, so it's probably missing */
 653                 return false;
 654         } catch (dcp::KDMDecryptionError) {
 655                 /* We have an incorrect KDM */
 656                 return false;
 657         }
 658
 659         BOOST_FOREACH (shared_ptr<dcp::Reel> i, decoder->reels()) {
 660                 if (type == TEXT_OPEN_SUBTITLE && !i->main_subtitle()) {
 661                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 662                         why_not = _("it does not have open subtitles in all its reels.");
 663                         return false;
 664                 }
 665                 if (type == TEXT_CLOSED_CAPTION && i->closed_captions().empty()) {
 666                         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 667                         why_not = _("it does not have closed captions in all its reels.");
 668                         return false;
 669                 }
 670         }
 671
 672         /// TRANSLATORS: this string will follow "Cannot reference this DCP: "
 673         return can_reference (film, bind (&check_text, _1), _("it overlaps other text content; remove the other content."), why_not);
 674 }
 675
 676 void
 677 DCPContent::take_settings_from (shared_ptr<const Content> c)
 678 {
 679         shared_ptr<const DCPContent> dc = dynamic_pointer_cast<const DCPContent> (c);
 680         if (!dc) {
 681                 return;
 682         }
 683
 684         _reference_video = dc->_reference_video;
 685         _reference_audio = dc->_reference_audio;
 686         for (int i = 0; i < TEXT_COUNT; ++i) {
 687                 _reference_text[i] = dc->_reference_text[i];
 688         }
 689 }
 690
 691 void
 692 DCPContent::set_cpl (string id)
 693 {
 694         ChangeSignaller<Content> cc (this, DCPContentProperty::CPL);
 695
 696         {
 697                 boost::mutex::scoped_lock lm (_mutex);
 698                 _cpl = id;
 699         }
 700 }
 701
 702 bool
 703 DCPContent::kdm_timing_window_valid () const
 704 {
 705         if (!_kdm) {
 706                 return true;
 707         }
 708
 709         dcp::LocalTime now;
 710         return _kdm->not_valid_before() < now && now < _kdm->not_valid_after();
 711 }