src/lib/reel_writer.cc

   1 /*
   2     Copyright (C) 2012-2019 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::exception;
  57 using std::map;
  58 using boost::shared_ptr;
  59 using boost::optional;
  60 using boost::dynamic_pointer_cast;
  61 using dcp::Data;
  62 using dcp::raw_convert;
  63
  64 int const ReelWriter::_info_size = 48;
  65
  66 /** @param job Related job, or 0 */
  67 ReelWriter::ReelWriter (
  68         shared_ptr<const Film> film, DCPTimePeriod period, shared_ptr<Job> job, int reel_index, int reel_count, optional<string> content_summary
  69         )
  70         : _film (film)
  71         , _period (period)
  72         , _last_written_video_frame (-1)
  73         , _last_written_eyes (EYES_RIGHT)
  74         , _reel_index (reel_index)
  75         , _reel_count (reel_count)
  76         , _content_summary (content_summary)
  77         , _job (job)
  78 {
  79         /* Create our picture asset in a subdirectory, named according to those
  80            film's parameters which affect the video output.  We will hard-link
  81            it into the DCP later.
  82         */
  83
  84         dcp::Standard const standard = _film->interop() ? dcp::INTEROP : dcp::SMPTE;
  85
  86         if (_film->three_d ()) {
  87                 _picture_asset.reset (new dcp::StereoPictureAsset (dcp::Fraction (_film->video_frame_rate(), 1), standard));
  88         } else {
  89                 _picture_asset.reset (new dcp::MonoPictureAsset (dcp::Fraction (_film->video_frame_rate(), 1), standard));
  90         }
  91
  92         _picture_asset->set_size (_film->frame_size ());
  93
  94         if (_film->encrypted ()) {
  95                 _picture_asset->set_key (_film->key ());
  96                 _picture_asset->set_context_id (_film->context_id ());
  97         }
  98
  99         _picture_asset->set_file (
 100                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(_period)
 101                 );
 102
 103         _first_nonexistant_frame = check_existing_picture_asset ();
 104
 105         _picture_asset_writer = _picture_asset->start_write (
 106                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(_period),
 107                 _first_nonexistant_frame > 0
 108                 );
 109
 110         if (_film->audio_channels ()) {
 111                 _sound_asset.reset (
 112                         new dcp::SoundAsset (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels (), standard)
 113                         );
 114
 115                 if (_film->encrypted ()) {
 116                         _sound_asset->set_key (_film->key ());
 117                 }
 118
 119                 DCPOMATIC_ASSERT (_film->directory());
 120
 121                 /* Write the sound asset into the film directory so that we leave the creation
 122                    of the DCP directory until the last minute.
 123                 */
 124                 _sound_asset_writer = _sound_asset->start_write (
 125                         _film->directory().get() / audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary)
 126                         );
 127         }
 128 }
 129
 130 /** @param frame reel-relative frame */
 131 void
 132 ReelWriter::write_frame_info (Frame frame, Eyes eyes, dcp::FrameInfo info) const
 133 {
 134         shared_ptr<InfoFileHandle> handle = _film->info_file_handle(_period, false);
 135         dcpomatic_fseek (handle->get(), frame_info_position(frame, eyes), SEEK_SET);
 136         checked_fwrite (&info.offset, sizeof(info.offset), handle->get(), handle->file());
 137         checked_fwrite (&info.size, sizeof (info.size), handle->get(), handle->file());
 138         checked_fwrite (info.hash.c_str(), info.hash.size(), handle->get(), handle->file());
 139 }
 140
 141 dcp::FrameInfo
 142 ReelWriter::read_frame_info (shared_ptr<InfoFileHandle> info, Frame frame, Eyes eyes) const
 143 {
 144         dcp::FrameInfo frame_info;
 145         dcpomatic_fseek (info->get(), frame_info_position(frame, eyes), SEEK_SET);
 146         checked_fread (&frame_info.offset, sizeof(frame_info.offset), info->get(), info->file());
 147         checked_fread (&frame_info.size, sizeof(frame_info.size), info->get(), info->file());
 148
 149         char hash_buffer[33];
 150         checked_fread (hash_buffer, 32, info->get(), info->file());
 151         hash_buffer[32] = '\0';
 152         frame_info.hash = hash_buffer;
 153
 154         return frame_info;
 155 }
 156
 157 long
 158 ReelWriter::frame_info_position (Frame frame, Eyes eyes) const
 159 {
 160         switch (eyes) {
 161         case EYES_BOTH:
 162                 return frame * _info_size;
 163         case EYES_LEFT:
 164                 return frame * _info_size * 2;
 165         case EYES_RIGHT:
 166                 return frame * _info_size * 2 + _info_size;
 167         default:
 168                 DCPOMATIC_ASSERT (false);
 169         }
 170
 171         DCPOMATIC_ASSERT (false);
 172 }
 173
 174 Frame
 175 ReelWriter::check_existing_picture_asset ()
 176 {
 177         DCPOMATIC_ASSERT (_picture_asset->file());
 178         boost::filesystem::path asset = _picture_asset->file().get();
 179
 180         shared_ptr<Job> job = _job.lock ();
 181
 182         /* If there is an existing asset, break any hard links to it as we are about to change its contents
 183            (if only by changing the IDs); see #1126.
 184         */
 185
 186         if (boost::filesystem::exists(asset) && boost::filesystem::hard_link_count(asset) > 1) {
 187                 if (job) {
 188                         job->sub (_("Copying old video file"));
 189                         copy_in_bits (asset, asset.string() + ".tmp", bind(&Job::set_progress, job.get(), _1, false));
 190                 } else {
 191                         boost::filesystem::copy_file (asset, asset.string() + ".tmp");
 192                 }
 193                 boost::filesystem::remove (asset);
 194                 boost::filesystem::rename (asset.string() + ".tmp", asset);
 195         }
 196
 197         if (job) {
 198                 job->sub (_("Checking existing image data"));
 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         shared_ptr<InfoFileHandle> info_file;
 211
 212         try {
 213                 info_file = _film->info_file_handle (_period, true);
 214         } catch (OpenFileError) {
 215                 LOG_GENERAL_NC ("Could not open film info file");
 216                 fclose (asset_file);
 217                 return 0;
 218         }
 219
 220         /* Offset of the last dcp::FrameInfo in the info file */
 221         int const n = (boost::filesystem::file_size(info_file->file()) / _info_size) - 1;
 222         LOG_GENERAL ("The last FI is %1; info file is %2, info size %3", n, boost::filesystem::file_size(info_file->file()), _info_size);
 223
 224         Frame first_nonexistant_frame;
 225         if (_film->three_d ()) {
 226                 /* Start looking at the last left frame */
 227                 first_nonexistant_frame = n / 2;
 228         } else {
 229                 first_nonexistant_frame = n;
 230         }
 231
 232         while (!existing_picture_frame_ok(asset_file, info_file, first_nonexistant_frame) && first_nonexistant_frame > 0) {
 233                 --first_nonexistant_frame;
 234         }
 235
 236         if (!_film->three_d() && first_nonexistant_frame > 0) {
 237                 /* If we are doing 3D we might have found a good L frame with no R, so only
 238                    do this if we're in 2D and we've just found a good B(oth) frame.
 239                 */
 240                 ++first_nonexistant_frame;
 241         }
 242
 243         LOG_GENERAL ("Proceeding with first nonexistant frame %1", first_nonexistant_frame);
 244
 245         fclose (asset_file);
 246
 247         return first_nonexistant_frame;
 248 }
 249
 250 void
 251 ReelWriter::write (optional<Data> encoded, Frame frame, Eyes eyes)
 252 {
 253         dcp::FrameInfo fin = _picture_asset_writer->write (encoded->data().get (), encoded->size());
 254         write_frame_info (frame, eyes, fin);
 255         _last_written[eyes] = encoded;
 256         _last_written_video_frame = frame;
 257         _last_written_eyes = eyes;
 258 }
 259
 260 void
 261 ReelWriter::fake_write (Frame frame, Eyes eyes, int size)
 262 {
 263         _picture_asset_writer->fake_write (size);
 264         _last_written_video_frame = frame;
 265         _last_written_eyes = eyes;
 266 }
 267
 268 void
 269 ReelWriter::repeat_write (Frame frame, Eyes eyes)
 270 {
 271         dcp::FrameInfo fin = _picture_asset_writer->write (
 272                 _last_written[eyes]->data().get(),
 273                 _last_written[eyes]->size()
 274                 );
 275         write_frame_info (frame, eyes, fin);
 276         _last_written_video_frame = frame;
 277         _last_written_eyes = eyes;
 278 }
 279
 280 void
 281 ReelWriter::finish ()
 282 {
 283         if (!_picture_asset_writer->finalize ()) {
 284                 /* Nothing was written to the picture asset */
 285                 LOG_GENERAL ("Nothing was written to reel %1 of %2", _reel_index, _reel_count);
 286                 _picture_asset.reset ();
 287         }
 288
 289         if (_sound_asset_writer && !_sound_asset_writer->finalize ()) {
 290                 /* Nothing was written to the sound asset */
 291                 _sound_asset.reset ();
 292         }
 293
 294         /* Hard-link any video asset file into the DCP */
 295         if (_picture_asset) {
 296                 DCPOMATIC_ASSERT (_picture_asset->file());
 297                 boost::filesystem::path video_from = _picture_asset->file().get();
 298                 boost::filesystem::path video_to;
 299                 video_to /= _film->dir (_film->dcp_name());
 300                 video_to /= video_asset_filename (_picture_asset, _reel_index, _reel_count, _content_summary);
 301
 302                 boost::system::error_code ec;
 303                 boost::filesystem::create_hard_link (video_from, video_to, ec);
 304                 if (ec) {
 305                         LOG_WARNING_NC ("Hard-link failed; copying instead");
 306                         shared_ptr<Job> job = _job.lock ();
 307                         if (job) {
 308                                 job->sub (_("Copying video file into DCP"));
 309                                 try {
 310                                         copy_in_bits (video_from, video_to, bind(&Job::set_progress, job.get(), _1, false));
 311                                 } catch (exception& e) {
 312                                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), e.what());
 313                                         throw FileError (e.what(), video_from);
 314                                 }
 315                         } else {
 316                                 boost::filesystem::copy_file (video_from, video_to, ec);
 317                                 if (ec) {
 318                                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 319                                         throw FileError (ec.message(), video_from);
 320                                 }
 321                         }
 322                 }
 323
 324                 _picture_asset->set_file (video_to);
 325         }
 326
 327         /* Move the audio asset into the DCP */
 328         if (_sound_asset) {
 329                 boost::filesystem::path audio_to;
 330                 audio_to /= _film->dir (_film->dcp_name ());
 331                 string const aaf = audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary);
 332                 audio_to /= aaf;
 333
 334                 boost::system::error_code ec;
 335                 boost::filesystem::rename (_film->file (aaf), audio_to, ec);
 336                 if (ec) {
 337                         throw FileError (
 338                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), aaf
 339                                 );
 340                 }
 341
 342                 _sound_asset->set_file (audio_to);
 343         }
 344 }
 345
 346 template <class T>
 347 shared_ptr<T>
 348 maybe_add_text (
 349         shared_ptr<dcp::SubtitleAsset> asset,
 350         int64_t picture_duration,
 351         shared_ptr<dcp::Reel> reel,
 352         list<ReferencedReelAsset> const & refs,
 353         list<shared_ptr<Font> > const & fonts,
 354         shared_ptr<const Film> film,
 355         DCPTimePeriod period
 356         )
 357 {
 358         Frame const period_duration = period.duration().frames_round(film->video_frame_rate());
 359
 360         shared_ptr<T> reel_asset;
 361
 362         if (asset) {
 363                 boost::filesystem::path liberation_normal;
 364                 try {
 365                         liberation_normal = shared_path() / "LiberationSans-Regular.ttf";
 366                         if (!boost::filesystem::exists (liberation_normal)) {
 367                                 /* Hack for unit tests */
 368                                 liberation_normal = shared_path() / "fonts" / "LiberationSans-Regular.ttf";
 369                         }
 370                 } catch (boost::filesystem::filesystem_error& e) {
 371
 372                 }
 373
 374                 if (!boost::filesystem::exists(liberation_normal)) {
 375                         liberation_normal = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf";
 376                 }
 377
 378                 /* Add the font to the subtitle content */
 379                 BOOST_FOREACH (shared_ptr<Font> j, fonts) {
 380                         asset->add_font (j->id(), j->file().get_value_or(liberation_normal));
 381                 }
 382
 383                 if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (asset)) {
 384                         boost::filesystem::path directory = film->dir (film->dcp_name ()) / asset->id ();
 385                         boost::filesystem::create_directories (directory);
 386                         asset->write (directory / ("sub_" + asset->id() + ".xml"));
 387                 } else {
 388                         /* All our assets should be the same length; use the picture asset length here
 389                            as a reference to set the subtitle one.  We'll use the duration rather than
 390                            the intrinsic duration; we don't care if the picture asset has been trimmed, we're
 391                            just interested in its presentation length.
 392                         */
 393                         dynamic_pointer_cast<dcp::SMPTESubtitleAsset>(asset)->set_intrinsic_duration (picture_duration);
 394
 395                         asset->write (
 396                                 film->dir(film->dcp_name()) / ("sub_" + asset->id() + ".mxf")
 397                                 );
 398                 }
 399
 400                 reel_asset.reset (
 401                         new T (
 402                                 asset,
 403                                 dcp::Fraction (film->video_frame_rate(), 1),
 404                                 picture_duration,
 405                                 0
 406                                 )
 407                         );
 408         } else {
 409                 /* We don't have a subtitle asset of our own; hopefully we have one to reference */
 410                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 411                         shared_ptr<T> k = dynamic_pointer_cast<T> (j.asset);
 412                         if (k && j.period == period) {
 413                                 reel_asset = k;
 414                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 415                                 if (k->hash()) {
 416                                         k->asset_ref()->set_hash (k->hash().get());
 417                                 }
 418                         }
 419                 }
 420         }
 421
 422         if (reel_asset) {
 423                 if (reel_asset->duration() != period_duration) {
 424                         throw ProgrammingError (
 425                                 __FILE__, __LINE__,
 426                                 String::compose ("%1 vs %2", reel_asset->duration(), period_duration)
 427                                 );
 428                 }
 429                 reel->add (reel_asset);
 430         }
 431
 432         return reel_asset;
 433 }
 434
 435 shared_ptr<dcp::Reel>
 436 ReelWriter::create_reel (list<ReferencedReelAsset> const & refs, list<shared_ptr<Font> > const & fonts)
 437 {
 438         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 439
 440         shared_ptr<dcp::ReelPictureAsset> reel_picture_asset;
 441
 442         if (_picture_asset) {
 443                 /* We have made a picture asset of our own.  Put it into the reel */
 444                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 445                 if (mono) {
 446                         reel_picture_asset.reset (new dcp::ReelMonoPictureAsset (mono, 0));
 447                 }
 448
 449                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 450                 if (stereo) {
 451                         reel_picture_asset.reset (new dcp::ReelStereoPictureAsset (stereo, 0));
 452                 }
 453         } else {
 454                 LOG_GENERAL ("no picture asset of our own; look through %1", refs.size());
 455                 /* We don't have a picture asset of our own; hopefully we have one to reference */
 456                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 457                         shared_ptr<dcp::ReelPictureAsset> k = dynamic_pointer_cast<dcp::ReelPictureAsset> (j.asset);
 458                         if (k) {
 459                                 LOG_GENERAL ("candidate picture asset period is %1-%2", j.period.from.get(), j.period.to.get());
 460                         }
 461                         if (k && j.period == _period) {
 462                                 reel_picture_asset = k;
 463                         }
 464                 }
 465         }
 466
 467         LOG_GENERAL ("create_reel for %1-%2; %3 of %4", _period.from.get(), _period.to.get(), _reel_index, _reel_count);
 468
 469         Frame const period_duration = _period.duration().frames_round(_film->video_frame_rate());
 470
 471         DCPOMATIC_ASSERT (reel_picture_asset);
 472         if (reel_picture_asset->duration() != period_duration) {
 473                 throw ProgrammingError (
 474                         __FILE__, __LINE__,
 475                         String::compose ("%1 vs %2", reel_picture_asset->duration(), period_duration)
 476                         );
 477         }
 478         reel->add (reel_picture_asset);
 479
 480         /* If we have a hash for this asset in the CPL, assume that it is correct */
 481         if (reel_picture_asset->hash()) {
 482                 reel_picture_asset->asset_ref()->set_hash (reel_picture_asset->hash().get());
 483         }
 484
 485         shared_ptr<dcp::ReelSoundAsset> reel_sound_asset;
 486
 487         if (_sound_asset) {
 488                 /* We have made a sound asset of our own.  Put it into the reel */
 489                 reel_sound_asset.reset (new dcp::ReelSoundAsset (_sound_asset, 0));
 490         } else {
 491                 /* We don't have a sound asset of our own; hopefully we have one to reference */
 492                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 493                         shared_ptr<dcp::ReelSoundAsset> k = dynamic_pointer_cast<dcp::ReelSoundAsset> (j.asset);
 494                         if (k && j.period == _period) {
 495                                 reel_sound_asset = k;
 496                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 497                                 if (k->hash()) {
 498                                         k->asset_ref()->set_hash (k->hash().get());
 499                                 }
 500                         }
 501                 }
 502         }
 503
 504         DCPOMATIC_ASSERT (reel_sound_asset);
 505         if (reel_sound_asset->duration() != period_duration) {
 506                 LOG_ERROR (
 507                         "Reel sound asset has length %1 but reel period is %2",
 508                         reel_sound_asset->duration(),
 509                         period_duration
 510                         );
 511                 if (reel_sound_asset->duration() != period_duration) {
 512                         throw ProgrammingError (
 513                                 __FILE__, __LINE__,
 514                                 String::compose ("%1 vs %2", reel_sound_asset->duration(), period_duration)
 515                                 );
 516                 }
 517
 518         }
 519         reel->add (reel_sound_asset);
 520
 521         maybe_add_text<dcp::ReelSubtitleAsset> (_subtitle_asset, reel_picture_asset->duration(), reel, refs, fonts, _film, _period);
 522         for (map<DCPTextTrack, shared_ptr<dcp::SubtitleAsset> >::const_iterator i = _closed_caption_assets.begin(); i != _closed_caption_assets.end(); ++i) {
 523                 shared_ptr<dcp::ReelClosedCaptionAsset> a = maybe_add_text<dcp::ReelClosedCaptionAsset> (
 524                         i->second, reel_picture_asset->duration(), reel, refs, fonts, _film, _period
 525                         );
 526                 a->set_annotation_text (i->first.name);
 527                 a->set_language (i->first.language);
 528         }
 529
 530         return reel;
 531 }
 532
 533 void
 534 ReelWriter::calculate_digests (boost::function<void (float)> set_progress)
 535 {
 536         if (_picture_asset) {
 537                 _picture_asset->hash (set_progress);
 538         }
 539
 540         if (_sound_asset) {
 541                 _sound_asset->hash (set_progress);
 542         }
 543 }
 544
 545 Frame
 546 ReelWriter::start () const
 547 {
 548         return _period.from.frames_floor (_film->video_frame_rate());
 549 }
 550
 551
 552 void
 553 ReelWriter::write (shared_ptr<const AudioBuffers> audio)
 554 {
 555         if (!_sound_asset_writer) {
 556                 return;
 557         }
 558
 559         DCPOMATIC_ASSERT (audio);
 560         _sound_asset_writer->write (audio->data(), audio->frames());
 561 }
 562
 563 void
 564 ReelWriter::write (PlayerText subs, TextType type, optional<DCPTextTrack> track, DCPTimePeriod period)
 565 {
 566         shared_ptr<dcp::SubtitleAsset> asset;
 567
 568         switch (type) {
 569         case TEXT_OPEN_SUBTITLE:
 570                 asset = _subtitle_asset;
 571                 break;
 572         case TEXT_CLOSED_CAPTION:
 573                 DCPOMATIC_ASSERT (track);
 574                 asset = _closed_caption_assets[*track];
 575                 break;
 576         default:
 577                 DCPOMATIC_ASSERT (false);
 578         }
 579
 580         if (!asset) {
 581                 string lang = _film->subtitle_language ();
 582                 if (_film->interop ()) {
 583                         shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
 584                         s->set_movie_title (_film->name ());
 585                         if (type == TEXT_OPEN_SUBTITLE) {
 586                                 s->set_language (lang.empty() ? "Unknown" : lang);
 587                         } else {
 588                                 s->set_language (track->language);
 589                         }
 590                         s->set_reel_number (raw_convert<string> (_reel_index + 1));
 591                         asset = s;
 592                 } else {
 593                         shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
 594                         s->set_content_title_text (_film->name ());
 595                         if (type == TEXT_OPEN_SUBTITLE && !lang.empty()) {
 596                                 s->set_language (lang);
 597                         } else {
 598                                 s->set_language (track->language);
 599                         }
 600                         s->set_edit_rate (dcp::Fraction (_film->video_frame_rate (), 1));
 601                         s->set_reel_number (_reel_index + 1);
 602                         s->set_time_code_rate (_film->video_frame_rate ());
 603                         s->set_start_time (dcp::Time ());
 604                         if (_film->encrypted ()) {
 605                                 s->set_key (_film->key ());
 606                         }
 607                         asset = s;
 608                 }
 609         }
 610
 611         switch (type) {
 612         case TEXT_OPEN_SUBTITLE:
 613                 _subtitle_asset = asset;
 614                 break;
 615         case TEXT_CLOSED_CAPTION:
 616                 DCPOMATIC_ASSERT (track);
 617                 _closed_caption_assets[*track] = asset;
 618                 break;
 619         default:
 620                 DCPOMATIC_ASSERT (false);
 621         }
 622
 623         BOOST_FOREACH (StringText i, subs.string) {
 624                 /* XXX: couldn't / shouldn't we use period here rather than getting time from the subtitle? */
 625                 i.set_in  (i.in()  - dcp::Time (_period.from.seconds(), i.in().tcr));
 626                 i.set_out (i.out() - dcp::Time (_period.from.seconds(), i.out().tcr));
 627                 asset->add (shared_ptr<dcp::Subtitle>(new dcp::SubtitleString(i)));
 628         }
 629
 630         BOOST_FOREACH (BitmapText i, subs.bitmap) {
 631                 asset->add (
 632                         shared_ptr<dcp::Subtitle>(
 633                                 new dcp::SubtitleImage(
 634                                         i.image->as_png(),
 635                                         dcp::Time(period.from.seconds() - _period.from.seconds(), _film->video_frame_rate()),
 636                                         dcp::Time(period.to.seconds() - _period.from.seconds(), _film->video_frame_rate()),
 637                                         i.rectangle.x, dcp::HALIGN_LEFT, i.rectangle.y, dcp::VALIGN_TOP,
 638                                         dcp::Time(), dcp::Time()
 639                                         )
 640                                 )
 641                         );
 642         }
 643 }
 644
 645 bool
 646 ReelWriter::existing_picture_frame_ok (FILE* asset_file, shared_ptr<InfoFileHandle> info_file, Frame frame) const
 647 {
 648         LOG_GENERAL ("Checking existing picture frame %1", frame);
 649
 650         /* Read the data from the info file; for 3D we just check the left
 651            frames until we find a good one.
 652         */
 653         dcp::FrameInfo const info = read_frame_info (info_file, frame, _film->three_d () ? EYES_LEFT : EYES_BOTH);
 654
 655         bool ok = true;
 656
 657         /* Read the data from the asset and hash it */
 658         dcpomatic_fseek (asset_file, info.offset, SEEK_SET);
 659         Data data (info.size);
 660         size_t const read = fread (data.data().get(), 1, data.size(), asset_file);
 661         LOG_GENERAL ("Read %1 bytes of asset data; wanted %2", read, info.size);
 662         if (read != static_cast<size_t> (data.size ())) {
 663                 LOG_GENERAL ("Existing frame %1 is incomplete", frame);
 664                 ok = false;
 665         } else {
 666                 Digester digester;
 667                 digester.add (data.data().get(), data.size());
 668                 LOG_GENERAL ("Hash %1 vs %2", digester.get(), info.hash);
 669                 if (digester.get() != info.hash) {
 670                         LOG_GENERAL ("Existing frame %1 failed hash check", frame);
 671                         ok = false;
 672                 }
 673         }
 674
 675         return ok;
 676 }