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