src/lib/reel_writer.cc

   1 /*
   2     Copyright (C) 2012-2018 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 "reel_writer.h"
  22 #include "film.h"
  23 #include "cross.h"
  24 #include "job.h"
  25 #include "log.h"
  26 #include "dcpomatic_log.h"
  27 #include "digester.h"
  28 #include "font.h"
  29 #include "compose.hpp"
  30 #include "audio_buffers.h"
  31 #include "image.h"
  32 #include <dcp/mono_picture_asset.h>
  33 #include <dcp/stereo_picture_asset.h>
  34 #include <dcp/sound_asset.h>
  35 #include <dcp/sound_asset_writer.h>
  36 #include <dcp/reel.h>
  37 #include <dcp/reel_mono_picture_asset.h>
  38 #include <dcp/reel_stereo_picture_asset.h>
  39 #include <dcp/reel_sound_asset.h>
  40 #include <dcp/reel_subtitle_asset.h>
  41 #include <dcp/reel_closed_caption_asset.h>
  42 #include <dcp/dcp.h>
  43 #include <dcp/cpl.h>
  44 #include <dcp/certificate_chain.h>
  45 #include <dcp/interop_subtitle_asset.h>
  46 #include <dcp/smpte_subtitle_asset.h>
  47 #include <dcp/raw_convert.h>
  48 #include <dcp/subtitle_image.h>
  49 #include <boost/foreach.hpp>
  50
  51 #include "i18n.h"
  52
  53 using std::list;
  54 using std::string;
  55 using std::cout;
  56 using std::map;
  57 using boost::shared_ptr;
  58 using boost::optional;
  59 using boost::dynamic_pointer_cast;
  60 using dcp::Data;
  61 using dcp::raw_convert;
  62
  63 int const ReelWriter::_info_size = 48;
  64
  65 ReelWriter::ReelWriter (
  66         shared_ptr<const Film> film, DCPTimePeriod period, shared_ptr<Job> job, int reel_index, int reel_count, optional<string> content_summary
  67         )
  68         : _film (film)
  69         , _period (period)
  70         , _last_written_video_frame (-1)
  71         , _last_written_eyes (EYES_RIGHT)
  72         , _reel_index (reel_index)
  73         , _reel_count (reel_count)
  74         , _content_summary (content_summary)
  75 {
  76         /* Create our picture asset in a subdirectory, named according to those
  77            film's parameters which affect the video output.  We will hard-link
  78            it into the DCP later.
  79         */
  80
  81         dcp::Standard const standard = _film->interop() ? dcp::INTEROP : dcp::SMPTE;
  82
  83         if (_film->three_d ()) {
  84                 _picture_asset.reset (new dcp::StereoPictureAsset (dcp::Fraction (_film->video_frame_rate(), 1), standard));
  85         } else {
  86                 _picture_asset.reset (new dcp::MonoPictureAsset (dcp::Fraction (_film->video_frame_rate(), 1), standard));
  87         }
  88
  89         _picture_asset->set_size (_film->frame_size ());
  90
  91         if (_film->encrypted ()) {
  92                 _picture_asset->set_key (_film->key ());
  93                 _picture_asset->set_context_id (_film->context_id ());
  94         }
  95
  96         _picture_asset->set_file (
  97                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(_period)
  98                 );
  99
 100         job->sub (_("Checking existing image data"));
 101         _first_nonexistant_frame = check_existing_picture_asset ();
 102
 103         _picture_asset_writer = _picture_asset->start_write (
 104                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(_period),
 105                 _first_nonexistant_frame > 0
 106                 );
 107
 108         if (_film->audio_channels ()) {
 109                 _sound_asset.reset (
 110                         new dcp::SoundAsset (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels (), standard)
 111                         );
 112
 113                 if (_film->encrypted ()) {
 114                         _sound_asset->set_key (_film->key ());
 115                 }
 116
 117                 DCPOMATIC_ASSERT (_film->directory());
 118
 119                 /* Write the sound asset into the film directory so that we leave the creation
 120                    of the DCP directory until the last minute.
 121                 */
 122                 _sound_asset_writer = _sound_asset->start_write (
 123                         _film->directory().get() / audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary)
 124                         );
 125         }
 126 }
 127
 128 /** @param frame reel-relative frame */
 129 void
 130 ReelWriter::write_frame_info (Frame frame, Eyes eyes, dcp::FrameInfo info) const
 131 {
 132         FILE* file = 0;
 133         boost::filesystem::path info_file = _film->info_file (_period);
 134
 135         bool const read = boost::filesystem::exists (info_file);
 136
 137         if (read) {
 138                 file = fopen_boost (info_file, "r+b");
 139         } else {
 140                 file = fopen_boost (info_file, "wb");
 141         }
 142         if (!file) {
 143                 throw OpenFileError (info_file, errno, read);
 144         }
 145         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 146         checked_fwrite (&info.offset, sizeof (info.offset), file, info_file);
 147         checked_fwrite (&info.size, sizeof (info.size), file, info_file);
 148         checked_fwrite (info.hash.c_str(), info.hash.size(), file, info_file);
 149         fclose (file);
 150 }
 151
 152 dcp::FrameInfo
 153 ReelWriter::read_frame_info (FILE* file, Frame frame, Eyes eyes) const
 154 {
 155         dcp::FrameInfo info;
 156         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 157         checked_fread (&info.offset, sizeof(info.offset), file, _film->info_file(_period));
 158         checked_fread (&info.size, sizeof(info.size), file, _film->info_file(_period));
 159
 160         char hash_buffer[33];
 161         checked_fread (hash_buffer, 32, file, _film->info_file(_period));
 162         hash_buffer[32] = '\0';
 163         info.hash = hash_buffer;
 164
 165         return info;
 166 }
 167
 168 long
 169 ReelWriter::frame_info_position (Frame frame, Eyes eyes) const
 170 {
 171         switch (eyes) {
 172         case EYES_BOTH:
 173                 return frame * _info_size;
 174         case EYES_LEFT:
 175                 return frame * _info_size * 2;
 176         case EYES_RIGHT:
 177                 return frame * _info_size * 2 + _info_size;
 178         default:
 179                 DCPOMATIC_ASSERT (false);
 180         }
 181
 182         DCPOMATIC_ASSERT (false);
 183 }
 184
 185 Frame
 186 ReelWriter::check_existing_picture_asset ()
 187 {
 188         DCPOMATIC_ASSERT (_picture_asset->file());
 189         boost::filesystem::path asset = _picture_asset->file().get();
 190
 191         /* If there is an existing asset, break any hard links to it as we are about to change its contents
 192            (if only by changing the IDs); see #1126.
 193         */
 194
 195         if (boost::filesystem::exists(asset) && boost::filesystem::hard_link_count(asset) > 1) {
 196                 boost::filesystem::copy_file (asset, asset.string() + ".tmp");
 197                 boost::filesystem::remove (asset);
 198                 boost::filesystem::rename (asset.string() + ".tmp", asset);
 199         }
 200
 201         /* Try to open the existing asset */
 202         FILE* asset_file = fopen_boost (asset, "rb");
 203         if (!asset_file) {
 204                 LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", asset.string(), errno);
 205                 return 0;
 206         } else {
 207                 LOG_GENERAL ("Opened existing asset at %1", asset.string());
 208         }
 209
 210         /* Offset of the last dcp::FrameInfo in the info file */
 211         int const n = (boost::filesystem::file_size (_film->info_file(_period)) / _info_size) - 1;
 212         LOG_GENERAL ("The last FI is %1; info file is %2, info size %3", n, boost::filesystem::file_size (_film->info_file(_period)), _info_size);
 213
 214         FILE* info_file = fopen_boost (_film->info_file(_period), "rb");
 215         if (!info_file) {
 216                 LOG_GENERAL_NC ("Could not open film info file");
 217                 fclose (asset_file);
 218                 return 0;
 219         }
 220
 221         Frame first_nonexistant_frame;
 222         if (_film->three_d ()) {
 223                 /* Start looking at the last left frame */
 224                 first_nonexistant_frame = n / 2;
 225         } else {
 226                 first_nonexistant_frame = n;
 227         }
 228
 229         while (!existing_picture_frame_ok(asset_file, info_file, first_nonexistant_frame) && first_nonexistant_frame > 0) {
 230                 --first_nonexistant_frame;
 231         }
 232
 233         if (!_film->three_d() && first_nonexistant_frame > 0) {
 234                 /* If we are doing 3D we might have found a good L frame with no R, so only
 235                    do this if we're in 2D and we've just found a good B(oth) frame.
 236                 */
 237                 ++first_nonexistant_frame;
 238         }
 239
 240         LOG_GENERAL ("Proceeding with first nonexistant frame %1", first_nonexistant_frame);
 241
 242         fclose (asset_file);
 243         fclose (info_file);
 244
 245         return first_nonexistant_frame;
 246 }
 247
 248 void
 249 ReelWriter::write (optional<Data> encoded, Frame frame, Eyes eyes)
 250 {
 251         dcp::FrameInfo fin = _picture_asset_writer->write (encoded->data().get (), encoded->size());
 252         write_frame_info (frame, eyes, fin);
 253         _last_written[eyes] = encoded;
 254         _last_written_video_frame = frame;
 255         _last_written_eyes = eyes;
 256 }
 257
 258 void
 259 ReelWriter::fake_write (Frame frame, Eyes eyes, int size)
 260 {
 261         _picture_asset_writer->fake_write (size);
 262         _last_written_video_frame = frame;
 263         _last_written_eyes = eyes;
 264 }
 265
 266 void
 267 ReelWriter::repeat_write (Frame frame, Eyes eyes)
 268 {
 269         dcp::FrameInfo fin = _picture_asset_writer->write (
 270                 _last_written[eyes]->data().get(),
 271                 _last_written[eyes]->size()
 272                 );
 273         write_frame_info (frame, eyes, fin);
 274         _last_written_video_frame = frame;
 275         _last_written_eyes = eyes;
 276 }
 277
 278 void
 279 ReelWriter::finish ()
 280 {
 281         if (!_picture_asset_writer->finalize ()) {
 282                 /* Nothing was written to the picture asset */
 283                 LOG_GENERAL ("Nothing was written to reel %1 of %2", _reel_index, _reel_count);
 284                 _picture_asset.reset ();
 285         }
 286
 287         if (_sound_asset_writer && !_sound_asset_writer->finalize ()) {
 288                 /* Nothing was written to the sound asset */
 289                 _sound_asset.reset ();
 290         }
 291
 292         /* Hard-link any video asset file into the DCP */
 293         if (_picture_asset) {
 294                 DCPOMATIC_ASSERT (_picture_asset->file());
 295                 boost::filesystem::path video_from = _picture_asset->file().get();
 296                 boost::filesystem::path video_to;
 297                 video_to /= _film->dir (_film->dcp_name());
 298                 video_to /= video_asset_filename (_picture_asset, _reel_index, _reel_count, _content_summary);
 299
 300                 boost::system::error_code ec;
 301                 boost::filesystem::create_hard_link (video_from, video_to, ec);
 302                 if (ec) {
 303                         LOG_WARNING_NC ("Hard-link failed; copying instead");
 304                         boost::filesystem::copy_file (video_from, video_to, ec);
 305                         if (ec) {
 306                                 LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 307                                 throw FileError (ec.message(), video_from);
 308                         }
 309                 }
 310
 311                 _picture_asset->set_file (video_to);
 312         }
 313
 314         /* Move the audio asset into the DCP */
 315         if (_sound_asset) {
 316                 boost::filesystem::path audio_to;
 317                 audio_to /= _film->dir (_film->dcp_name ());
 318                 string const aaf = audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary);
 319                 audio_to /= aaf;
 320
 321                 boost::system::error_code ec;
 322                 boost::filesystem::rename (_film->file (aaf), audio_to, ec);
 323                 if (ec) {
 324                         throw FileError (
 325                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), aaf
 326                                 );
 327                 }
 328
 329                 _sound_asset->set_file (audio_to);
 330         }
 331 }
 332
 333 template <class T>
 334 shared_ptr<T>
 335 maybe_add_text (
 336         shared_ptr<dcp::SubtitleAsset> asset,
 337         int64_t picture_duration,
 338         shared_ptr<dcp::Reel> reel,
 339         list<ReferencedReelAsset> const & refs,
 340         list<shared_ptr<Font> > const & fonts,
 341         shared_ptr<const Film> film,
 342         DCPTimePeriod period
 343         )
 344 {
 345         Frame const period_duration = period.duration().frames_round(film->video_frame_rate());
 346
 347         shared_ptr<T> reel_asset;
 348
 349         if (asset) {
 350                 boost::filesystem::path liberation_normal;
 351                 try {
 352                         liberation_normal = shared_path() / "LiberationSans-Regular.ttf";
 353                         if (!boost::filesystem::exists (liberation_normal)) {
 354                                 /* Hack for unit tests */
 355                                 liberation_normal = shared_path() / "fonts" / "LiberationSans-Regular.ttf";
 356                         }
 357                 } catch (boost::filesystem::filesystem_error& e) {
 358
 359                 }
 360
 361                 if (!boost::filesystem::exists(liberation_normal)) {
 362                         liberation_normal = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf";
 363                 }
 364
 365                 /* Add all the fonts to the subtitle content */
 366                 BOOST_FOREACH (shared_ptr<Font> j, fonts) {
 367                         asset->add_font (j->id(), j->file(FontFiles::NORMAL).get_value_or(liberation_normal));
 368                 }
 369
 370                 if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (asset)) {
 371                         boost::filesystem::path directory = film->dir (film->dcp_name ()) / asset->id ();
 372                         boost::filesystem::create_directories (directory);
 373                         asset->write (directory / ("sub_" + asset->id() + ".xml"));
 374                 } else {
 375                         /* All our assets should be the same length; use the picture asset length here
 376                            as a reference to set the subtitle one.  We'll use the duration rather than
 377                            the intrinsic duration; we don't care if the picture asset has been trimmed, we're
 378                            just interested in its presentation length.
 379                         */
 380                         dynamic_pointer_cast<dcp::SMPTESubtitleAsset>(asset)->set_intrinsic_duration (picture_duration);
 381
 382                         asset->write (
 383                                 film->dir(film->dcp_name()) / ("sub_" + asset->id() + ".mxf")
 384                                 );
 385                 }
 386
 387                 reel_asset.reset (
 388                         new T (
 389                                 asset,
 390                                 dcp::Fraction (film->video_frame_rate(), 1),
 391                                 picture_duration,
 392                                 0
 393                                 )
 394                         );
 395         } else {
 396                 /* We don't have a subtitle asset of our own; hopefully we have one to reference */
 397                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 398                         shared_ptr<T> k = dynamic_pointer_cast<T> (j.asset);
 399                         if (k && j.period == period) {
 400                                 reel_asset = k;
 401                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 402                                 if (k->hash()) {
 403                                         k->asset_ref()->set_hash (k->hash().get());
 404                                 }
 405                         }
 406                 }
 407         }
 408
 409         if (reel_asset) {
 410                 if (reel_asset->duration() != period_duration) {
 411                         throw ProgrammingError (
 412                                 __FILE__, __LINE__,
 413                                 String::compose ("%1 vs %2", reel_asset->duration(), period_duration)
 414                                 );
 415                 }
 416                 reel->add (reel_asset);
 417         }
 418
 419         return reel_asset;
 420 }
 421
 422 shared_ptr<dcp::Reel>
 423 ReelWriter::create_reel (list<ReferencedReelAsset> const & refs, list<shared_ptr<Font> > const & fonts)
 424 {
 425         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 426
 427         shared_ptr<dcp::ReelPictureAsset> reel_picture_asset;
 428
 429         if (_picture_asset) {
 430                 /* We have made a picture asset of our own.  Put it into the reel */
 431                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 432                 if (mono) {
 433                         reel_picture_asset.reset (new dcp::ReelMonoPictureAsset (mono, 0));
 434                 }
 435
 436                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 437                 if (stereo) {
 438                         reel_picture_asset.reset (new dcp::ReelStereoPictureAsset (stereo, 0));
 439                 }
 440         } else {
 441                 LOG_GENERAL ("no picture asset of our own; look through %1", refs.size());
 442                 /* We don't have a picture asset of our own; hopefully we have one to reference */
 443                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 444                         shared_ptr<dcp::ReelPictureAsset> k = dynamic_pointer_cast<dcp::ReelPictureAsset> (j.asset);
 445                         if (k) {
 446                                 LOG_GENERAL ("candidate picture asset period is %1-%2", j.period.from.get(), j.period.to.get());
 447                         }
 448                         if (k && j.period == _period) {
 449                                 reel_picture_asset = k;
 450                         }
 451                 }
 452         }
 453
 454         LOG_GENERAL ("create_reel for %1-%2; %3 of %4", _period.from.get(), _period.to.get(), _reel_index, _reel_count);
 455
 456         Frame const period_duration = _period.duration().frames_round(_film->video_frame_rate());
 457
 458         DCPOMATIC_ASSERT (reel_picture_asset);
 459         if (reel_picture_asset->duration() != period_duration) {
 460                 throw ProgrammingError (
 461                         __FILE__, __LINE__,
 462                         String::compose ("%1 vs %2", reel_picture_asset->duration(), period_duration)
 463                         );
 464         }
 465         reel->add (reel_picture_asset);
 466
 467         /* If we have a hash for this asset in the CPL, assume that it is correct */
 468         if (reel_picture_asset->hash()) {
 469                 reel_picture_asset->asset_ref()->set_hash (reel_picture_asset->hash().get());
 470         }
 471
 472         shared_ptr<dcp::ReelSoundAsset> reel_sound_asset;
 473
 474         if (_sound_asset) {
 475                 /* We have made a sound asset of our own.  Put it into the reel */
 476                 reel_sound_asset.reset (new dcp::ReelSoundAsset (_sound_asset, 0));
 477         } else {
 478                 /* We don't have a sound asset of our own; hopefully we have one to reference */
 479                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 480                         shared_ptr<dcp::ReelSoundAsset> k = dynamic_pointer_cast<dcp::ReelSoundAsset> (j.asset);
 481                         if (k && j.period == _period) {
 482                                 reel_sound_asset = k;
 483                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 484                                 if (k->hash()) {
 485                                         k->asset_ref()->set_hash (k->hash().get());
 486                                 }
 487                         }
 488                 }
 489         }
 490
 491         DCPOMATIC_ASSERT (reel_sound_asset);
 492         if (reel_sound_asset->duration() != period_duration) {
 493                 LOG_ERROR (
 494                         "Reel sound asset has length %1 but reel period is %2",
 495                         reel_sound_asset->duration(),
 496                         period_duration
 497                         );
 498                 if (reel_sound_asset->duration() != period_duration) {
 499                         throw ProgrammingError (
 500                                 __FILE__, __LINE__,
 501                                 String::compose ("%1 vs %2", reel_sound_asset->duration(), period_duration)
 502                                 );
 503                 }
 504
 505         }
 506         reel->add (reel_sound_asset);
 507
 508         maybe_add_text<dcp::ReelSubtitleAsset> (_subtitle_asset, reel_picture_asset->duration(), reel, refs, fonts, _film, _period);
 509         for (map<DCPTextTrack, shared_ptr<dcp::SubtitleAsset> >::const_iterator i = _closed_caption_assets.begin(); i != _closed_caption_assets.end(); ++i) {
 510                 shared_ptr<dcp::ReelClosedCaptionAsset> a = maybe_add_text<dcp::ReelClosedCaptionAsset> (
 511                         i->second, reel_picture_asset->duration(), reel, refs, fonts, _film, _period
 512                         );
 513                 a->set_annotation_text (i->first.name);
 514                 a->set_language (i->first.language);
 515         }
 516
 517         return reel;
 518 }
 519
 520 void
 521 ReelWriter::calculate_digests (boost::function<void (float)> set_progress)
 522 {
 523         if (_picture_asset) {
 524                 _picture_asset->hash (set_progress);
 525         }
 526
 527         if (_sound_asset) {
 528                 _sound_asset->hash (set_progress);
 529         }
 530 }
 531
 532 Frame
 533 ReelWriter::start () const
 534 {
 535         return _period.from.frames_floor (_film->video_frame_rate());
 536 }
 537
 538
 539 void
 540 ReelWriter::write (shared_ptr<const AudioBuffers> audio)
 541 {
 542         if (!_sound_asset_writer) {
 543                 return;
 544         }
 545
 546         DCPOMATIC_ASSERT (audio);
 547         _sound_asset_writer->write (audio->data(), audio->frames());
 548 }
 549
 550 void
 551 ReelWriter::write (PlayerText subs, TextType type, optional<DCPTextTrack> track, DCPTimePeriod period)
 552 {
 553         shared_ptr<dcp::SubtitleAsset> asset;
 554
 555         switch (type) {
 556         case TEXT_OPEN_SUBTITLE:
 557                 asset = _subtitle_asset;
 558                 break;
 559         case TEXT_CLOSED_CAPTION:
 560                 DCPOMATIC_ASSERT (track);
 561                 asset = _closed_caption_assets[*track];
 562                 break;
 563         default:
 564                 DCPOMATIC_ASSERT (false);
 565         }
 566
 567         if (!asset) {
 568                 string lang = _film->subtitle_language ();
 569                 if (lang.empty ()) {
 570                         lang = "Unknown";
 571                 }
 572                 if (_film->interop ()) {
 573                         shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
 574                         s->set_movie_title (_film->name ());
 575                         s->set_language (lang);
 576                         s->set_reel_number (raw_convert<string> (_reel_index + 1));
 577                         asset = s;
 578                 } else {
 579                         shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
 580                         s->set_content_title_text (_film->name ());
 581                         s->set_language (lang);
 582                         s->set_edit_rate (dcp::Fraction (_film->video_frame_rate (), 1));
 583                         s->set_reel_number (_reel_index + 1);
 584                         s->set_time_code_rate (_film->video_frame_rate ());
 585                         s->set_start_time (dcp::Time ());
 586                         if (_film->encrypted ()) {
 587                                 s->set_key (_film->key ());
 588                         }
 589                         asset = s;
 590                 }
 591         }
 592
 593         switch (type) {
 594         case TEXT_OPEN_SUBTITLE:
 595                 _subtitle_asset = asset;
 596                 break;
 597         case TEXT_CLOSED_CAPTION:
 598                 DCPOMATIC_ASSERT (track);
 599                 _closed_caption_assets[*track] = asset;
 600                 break;
 601         default:
 602                 DCPOMATIC_ASSERT (false);
 603         }
 604
 605         BOOST_FOREACH (StringText i, subs.string) {
 606                 /* XXX: couldn't / shouldn't we use period here rather than getting time from the subtitle? */
 607                 i.set_in  (i.in()  - dcp::Time (_period.from.seconds(), i.in().tcr));
 608                 i.set_out (i.out() - dcp::Time (_period.from.seconds(), i.out().tcr));
 609                 asset->add (shared_ptr<dcp::Subtitle>(new dcp::SubtitleString(i)));
 610         }
 611
 612         BOOST_FOREACH (BitmapText i, subs.bitmap) {
 613                 asset->add (
 614                         shared_ptr<dcp::Subtitle>(
 615                                 new dcp::SubtitleImage(
 616                                         i.image->as_png(),
 617                                         dcp::Time(period.from.seconds(), _film->video_frame_rate()),
 618                                         dcp::Time(period.to.seconds(), _film->video_frame_rate()),
 619                                         i.rectangle.x, dcp::HALIGN_LEFT, i.rectangle.y, dcp::VALIGN_TOP,
 620                                         dcp::Time(), dcp::Time()
 621                                         )
 622                                 )
 623                         );
 624         }
 625 }
 626
 627 bool
 628 ReelWriter::existing_picture_frame_ok (FILE* asset_file, FILE* info_file, Frame frame) const
 629 {
 630         LOG_GENERAL ("Checking existing picture frame %1", frame);
 631
 632         /* Read the data from the info file; for 3D we just check the left
 633            frames until we find a good one.
 634         */
 635         dcp::FrameInfo const info = read_frame_info (info_file, frame, _film->three_d () ? EYES_LEFT : EYES_BOTH);
 636
 637         bool ok = true;
 638
 639         /* Read the data from the asset and hash it */
 640         dcpomatic_fseek (asset_file, info.offset, SEEK_SET);
 641         Data data (info.size);
 642         size_t const read = fread (data.data().get(), 1, data.size(), asset_file);
 643         LOG_GENERAL ("Read %1 bytes of asset data; wanted %2", read, info.size);
 644         if (read != static_cast<size_t> (data.size ())) {
 645                 LOG_GENERAL ("Existing frame %1 is incomplete", frame);
 646                 ok = false;
 647         } else {
 648                 Digester digester;
 649                 digester.add (data.data().get(), data.size());
 650                 LOG_GENERAL ("Hash %1 vs %2", digester.get(), info.hash);
 651                 if (digester.get() != info.hash) {
 652                         LOG_GENERAL ("Existing frame %1 failed hash check", frame);
 653                         ok = false;
 654                 }
 655         }
 656
 657         return ok;
 658 }