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/reel_markers_asset.h>
  43 #include <dcp/dcp.h>
  44 #include <dcp/cpl.h>
  45 #include <dcp/certificate_chain.h>
  46 #include <dcp/interop_subtitle_asset.h>
  47 #include <dcp/smpte_subtitle_asset.h>
  48 #include <dcp/raw_convert.h>
  49 #include <dcp/subtitle_image.h>
  50 #include <boost/foreach.hpp>
  51
  52 #include "i18n.h"
  53
  54 using std::list;
  55 using std::string;
  56 using std::cout;
  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 ReelWriter::ReelWriter (
  67         shared_ptr<const Film> film, DCPTimePeriod period, shared_ptr<Job> job, int reel_index, int reel_count, optional<string> content_summary
  68         )
  69         : _film (film)
  70         , _period (period)
  71         , _last_written_video_frame (-1)
  72         , _last_written_eyes (EYES_RIGHT)
  73         , _reel_index (reel_index)
  74         , _reel_count (reel_count)
  75         , _content_summary (content_summary)
  76 {
  77         /* Create our picture asset in a subdirectory, named according to those
  78            film's parameters which affect the video output.  We will hard-link
  79            it into the DCP later.
  80         */
  81
  82         dcp::Standard const standard = _film->interop() ? dcp::INTEROP : dcp::SMPTE;
  83
  84         if (_film->three_d ()) {
  85                 _picture_asset.reset (new dcp::StereoPictureAsset (dcp::Fraction (_film->video_frame_rate(), 1), standard));
  86         } else {
  87                 _picture_asset.reset (new dcp::MonoPictureAsset (dcp::Fraction (_film->video_frame_rate(), 1), standard));
  88         }
  89
  90         _picture_asset->set_size (_film->frame_size ());
  91
  92         if (_film->encrypted ()) {
  93                 _picture_asset->set_key (_film->key ());
  94                 _picture_asset->set_context_id (_film->context_id ());
  95         }
  96
  97         _picture_asset->set_file (
  98                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(_period)
  99                 );
 100
 101         job->sub (_("Checking existing image data"));
 102         _first_nonexistant_frame = check_existing_picture_asset ();
 103
 104         _picture_asset_writer = _picture_asset->start_write (
 105                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(_period),
 106                 _first_nonexistant_frame > 0
 107                 );
 108
 109         if (_film->audio_channels ()) {
 110                 _sound_asset.reset (
 111                         new dcp::SoundAsset (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels (), standard)
 112                         );
 113
 114                 if (_film->encrypted ()) {
 115                         _sound_asset->set_key (_film->key ());
 116                 }
 117
 118                 DCPOMATIC_ASSERT (_film->directory());
 119
 120                 /* Write the sound asset into the film directory so that we leave the creation
 121                    of the DCP directory until the last minute.
 122                 */
 123                 _sound_asset_writer = _sound_asset->start_write (
 124                         _film->directory().get() / audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary)
 125                         );
 126         }
 127 }
 128
 129 /** @param frame reel-relative frame */
 130 void
 131 ReelWriter::write_frame_info (Frame frame, Eyes eyes, dcp::FrameInfo info) const
 132 {
 133         FILE* file = 0;
 134         boost::filesystem::path info_file = _film->info_file (_period);
 135
 136         bool const read = boost::filesystem::exists (info_file);
 137
 138         if (read) {
 139                 file = fopen_boost (info_file, "r+b");
 140         } else {
 141                 file = fopen_boost (info_file, "wb");
 142         }
 143         if (!file) {
 144                 throw OpenFileError (info_file, errno, read);
 145         }
 146         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 147         checked_fwrite (&info.offset, sizeof (info.offset), file, info_file);
 148         checked_fwrite (&info.size, sizeof (info.size), file, info_file);
 149         checked_fwrite (info.hash.c_str(), info.hash.size(), file, info_file);
 150         fclose (file);
 151 }
 152
 153 dcp::FrameInfo
 154 ReelWriter::read_frame_info (FILE* file, Frame frame, Eyes eyes) const
 155 {
 156         dcp::FrameInfo info;
 157         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 158         checked_fread (&info.offset, sizeof(info.offset), file, _film->info_file(_period));
 159         checked_fread (&info.size, sizeof(info.size), file, _film->info_file(_period));
 160
 161         char hash_buffer[33];
 162         checked_fread (hash_buffer, 32, file, _film->info_file(_period));
 163         hash_buffer[32] = '\0';
 164         info.hash = hash_buffer;
 165
 166         return info;
 167 }
 168
 169 long
 170 ReelWriter::frame_info_position (Frame frame, Eyes eyes) const
 171 {
 172         switch (eyes) {
 173         case EYES_BOTH:
 174                 return frame * _info_size;
 175         case EYES_LEFT:
 176                 return frame * _info_size * 2;
 177         case EYES_RIGHT:
 178                 return frame * _info_size * 2 + _info_size;
 179         default:
 180                 DCPOMATIC_ASSERT (false);
 181         }
 182
 183         DCPOMATIC_ASSERT (false);
 184 }
 185
 186 Frame
 187 ReelWriter::check_existing_picture_asset ()
 188 {
 189         DCPOMATIC_ASSERT (_picture_asset->file());
 190         boost::filesystem::path asset = _picture_asset->file().get();
 191
 192         /* If there is an existing asset, break any hard links to it as we are about to change its contents
 193            (if only by changing the IDs); see #1126.
 194         */
 195
 196         if (boost::filesystem::exists(asset) && boost::filesystem::hard_link_count(asset) > 1) {
 197                 boost::filesystem::copy_file (asset, asset.string() + ".tmp");
 198                 boost::filesystem::remove (asset);
 199                 boost::filesystem::rename (asset.string() + ".tmp", asset);
 200         }
 201
 202         /* Try to open the existing asset */
 203         FILE* asset_file = fopen_boost (asset, "rb");
 204         if (!asset_file) {
 205                 LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", asset.string(), errno);
 206                 return 0;
 207         } else {
 208                 LOG_GENERAL ("Opened existing asset at %1", asset.string());
 209         }
 210
 211         /* Offset of the last dcp::FrameInfo in the info file */
 212         int const n = (boost::filesystem::file_size (_film->info_file(_period)) / _info_size) - 1;
 213         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);
 214
 215         FILE* info_file = fopen_boost (_film->info_file(_period), "rb");
 216         if (!info_file) {
 217                 LOG_GENERAL_NC ("Could not open film info file");
 218                 fclose (asset_file);
 219                 return 0;
 220         }
 221
 222         Frame first_nonexistant_frame;
 223         if (_film->three_d ()) {
 224                 /* Start looking at the last left frame */
 225                 first_nonexistant_frame = n / 2;
 226         } else {
 227                 first_nonexistant_frame = n;
 228         }
 229
 230         while (!existing_picture_frame_ok(asset_file, info_file, first_nonexistant_frame) && first_nonexistant_frame > 0) {
 231                 --first_nonexistant_frame;
 232         }
 233
 234         if (!_film->three_d() && first_nonexistant_frame > 0) {
 235                 /* If we are doing 3D we might have found a good L frame with no R, so only
 236                    do this if we're in 2D and we've just found a good B(oth) frame.
 237                 */
 238                 ++first_nonexistant_frame;
 239         }
 240
 241         LOG_GENERAL ("Proceeding with first nonexistant frame %1", first_nonexistant_frame);
 242
 243         fclose (asset_file);
 244         fclose (info_file);
 245
 246         return first_nonexistant_frame;
 247 }
 248
 249 void
 250 ReelWriter::write (optional<Data> encoded, Frame frame, Eyes eyes)
 251 {
 252         dcp::FrameInfo fin = _picture_asset_writer->write (encoded->data().get (), encoded->size());
 253         write_frame_info (frame, eyes, fin);
 254         _last_written[eyes] = encoded;
 255         _last_written_video_frame = frame;
 256         _last_written_eyes = eyes;
 257 }
 258
 259 void
 260 ReelWriter::fake_write (Frame frame, Eyes eyes, int size)
 261 {
 262         _picture_asset_writer->fake_write (size);
 263         _last_written_video_frame = frame;
 264         _last_written_eyes = eyes;
 265 }
 266
 267 void
 268 ReelWriter::repeat_write (Frame frame, Eyes eyes)
 269 {
 270         dcp::FrameInfo fin = _picture_asset_writer->write (
 271                 _last_written[eyes]->data().get(),
 272                 _last_written[eyes]->size()
 273                 );
 274         write_frame_info (frame, eyes, fin);
 275         _last_written_video_frame = frame;
 276         _last_written_eyes = eyes;
 277 }
 278
 279 void
 280 ReelWriter::finish ()
 281 {
 282         if (!_picture_asset_writer->finalize ()) {
 283                 /* Nothing was written to the picture asset */
 284                 LOG_GENERAL ("Nothing was written to reel %1 of %2", _reel_index, _reel_count);
 285                 _picture_asset.reset ();
 286         }
 287
 288         if (_sound_asset_writer && !_sound_asset_writer->finalize ()) {
 289                 /* Nothing was written to the sound asset */
 290                 _sound_asset.reset ();
 291         }
 292
 293         /* Hard-link any video asset file into the DCP */
 294         if (_picture_asset) {
 295                 DCPOMATIC_ASSERT (_picture_asset->file());
 296                 boost::filesystem::path video_from = _picture_asset->file().get();
 297                 boost::filesystem::path video_to;
 298                 video_to /= _film->dir (_film->dcp_name());
 299                 video_to /= video_asset_filename (_picture_asset, _reel_index, _reel_count, _content_summary);
 300
 301                 boost::system::error_code ec;
 302                 boost::filesystem::create_hard_link (video_from, video_to, ec);
 303                 if (ec) {
 304                         LOG_WARNING_NC ("Hard-link failed; copying instead");
 305                         boost::filesystem::copy_file (video_from, video_to, ec);
 306                         if (ec) {
 307                                 LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 308                                 throw FileError (ec.message(), video_from);
 309                         }
 310                 }
 311
 312                 _picture_asset->set_file (video_to);
 313         }
 314
 315         /* Move the audio asset into the DCP */
 316         if (_sound_asset) {
 317                 boost::filesystem::path audio_to;
 318                 audio_to /= _film->dir (_film->dcp_name ());
 319                 string const aaf = audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary);
 320                 audio_to /= aaf;
 321
 322                 boost::system::error_code ec;
 323                 boost::filesystem::rename (_film->file (aaf), audio_to, ec);
 324                 if (ec) {
 325                         throw FileError (
 326                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), aaf
 327                                 );
 328                 }
 329
 330                 _sound_asset->set_file (audio_to);
 331         }
 332 }
 333
 334 template <class T>
 335 shared_ptr<T>
 336 maybe_add_text (
 337         shared_ptr<dcp::SubtitleAsset> asset,
 338         int64_t picture_duration,
 339         shared_ptr<dcp::Reel> reel,
 340         list<ReferencedReelAsset> const & refs,
 341         list<shared_ptr<Font> > const & fonts,
 342         shared_ptr<const Film> film,
 343         DCPTimePeriod period
 344         )
 345 {
 346         Frame const period_duration = period.duration().frames_round(film->video_frame_rate());
 347
 348         shared_ptr<T> reel_asset;
 349
 350         if (asset) {
 351                 boost::filesystem::path liberation_normal;
 352                 try {
 353                         liberation_normal = shared_path() / "LiberationSans-Regular.ttf";
 354                         if (!boost::filesystem::exists (liberation_normal)) {
 355                                 /* Hack for unit tests */
 356                                 liberation_normal = shared_path() / "fonts" / "LiberationSans-Regular.ttf";
 357                         }
 358                 } catch (boost::filesystem::filesystem_error& e) {
 359
 360                 }
 361
 362                 if (!boost::filesystem::exists(liberation_normal)) {
 363                         liberation_normal = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf";
 364                 }
 365
 366                 /* Add the font to the subtitle content */
 367                 BOOST_FOREACH (shared_ptr<Font> j, fonts) {
 368                         asset->add_font (j->id(), j->file().get_value_or(liberation_normal));
 369                 }
 370
 371                 if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (asset)) {
 372                         boost::filesystem::path directory = film->dir (film->dcp_name ()) / asset->id ();
 373                         boost::filesystem::create_directories (directory);
 374                         asset->write (directory / ("sub_" + asset->id() + ".xml"));
 375                 } else {
 376                         /* All our assets should be the same length; use the picture asset length here
 377                            as a reference to set the subtitle one.  We'll use the duration rather than
 378                            the intrinsic duration; we don't care if the picture asset has been trimmed, we're
 379                            just interested in its presentation length.
 380                         */
 381                         dynamic_pointer_cast<dcp::SMPTESubtitleAsset>(asset)->set_intrinsic_duration (picture_duration);
 382
 383                         asset->write (
 384                                 film->dir(film->dcp_name()) / ("sub_" + asset->id() + ".mxf")
 385                                 );
 386                 }
 387
 388                 reel_asset.reset (
 389                         new T (
 390                                 asset,
 391                                 dcp::Fraction (film->video_frame_rate(), 1),
 392                                 picture_duration,
 393                                 0
 394                                 )
 395                         );
 396         } else {
 397                 /* We don't have a subtitle asset of our own; hopefully we have one to reference */
 398                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 399                         shared_ptr<T> k = dynamic_pointer_cast<T> (j.asset);
 400                         if (k && j.period == period) {
 401                                 reel_asset = k;
 402                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 403                                 if (k->hash()) {
 404                                         k->asset_ref()->set_hash (k->hash().get());
 405                                 }
 406                         }
 407                 }
 408         }
 409
 410         if (reel_asset) {
 411                 if (reel_asset->actual_duration() != period_duration) {
 412                         throw ProgrammingError (
 413                                 __FILE__, __LINE__,
 414                                 String::compose ("%1 vs %2", reel_asset->actual_duration(), period_duration)
 415                                 );
 416                 }
 417                 reel->add (reel_asset);
 418         }
 419
 420         return reel_asset;
 421 }
 422
 423 shared_ptr<dcp::Reel>
 424 ReelWriter::create_reel (list<ReferencedReelAsset> const & refs, list<shared_ptr<Font> > const & fonts)
 425 {
 426         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 427
 428         shared_ptr<dcp::ReelPictureAsset> reel_picture_asset;
 429
 430         if (_picture_asset) {
 431                 /* We have made a picture asset of our own.  Put it into the reel */
 432                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 433                 if (mono) {
 434                         reel_picture_asset.reset (new dcp::ReelMonoPictureAsset (mono, 0));
 435                 }
 436
 437                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 438                 if (stereo) {
 439                         reel_picture_asset.reset (new dcp::ReelStereoPictureAsset (stereo, 0));
 440                 }
 441         } else {
 442                 LOG_GENERAL ("no picture asset of our own; look through %1", refs.size());
 443                 /* We don't have a picture asset of our own; hopefully we have one to reference */
 444                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 445                         shared_ptr<dcp::ReelPictureAsset> k = dynamic_pointer_cast<dcp::ReelPictureAsset> (j.asset);
 446                         if (k) {
 447                                 LOG_GENERAL ("candidate picture asset period is %1-%2", j.period.from.get(), j.period.to.get());
 448                         }
 449                         if (k && j.period == _period) {
 450                                 reel_picture_asset = k;
 451                         }
 452                 }
 453         }
 454
 455         LOG_GENERAL ("create_reel for %1-%2; %3 of %4", _period.from.get(), _period.to.get(), _reel_index, _reel_count);
 456
 457         Frame const period_duration = _period.duration().frames_round(_film->video_frame_rate());
 458
 459         DCPOMATIC_ASSERT (reel_picture_asset);
 460         if (reel_picture_asset->duration() != period_duration) {
 461                 throw ProgrammingError (
 462                         __FILE__, __LINE__,
 463                         String::compose ("%1 vs %2", reel_picture_asset->actual_duration(), period_duration)
 464                         );
 465         }
 466         reel->add (reel_picture_asset);
 467
 468         /* If we have a hash for this asset in the CPL, assume that it is correct */
 469         if (reel_picture_asset->hash()) {
 470                 reel_picture_asset->asset_ref()->set_hash (reel_picture_asset->hash().get());
 471         }
 472
 473         shared_ptr<dcp::ReelSoundAsset> reel_sound_asset;
 474
 475         if (_sound_asset) {
 476                 /* We have made a sound asset of our own.  Put it into the reel */
 477                 reel_sound_asset.reset (new dcp::ReelSoundAsset (_sound_asset, 0));
 478         } else {
 479                 /* We don't have a sound asset of our own; hopefully we have one to reference */
 480                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 481                         shared_ptr<dcp::ReelSoundAsset> k = dynamic_pointer_cast<dcp::ReelSoundAsset> (j.asset);
 482                         if (k && j.period == _period) {
 483                                 reel_sound_asset = k;
 484                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 485                                 if (k->hash()) {
 486                                         k->asset_ref()->set_hash (k->hash().get());
 487                                 }
 488                         }
 489                 }
 490         }
 491
 492         DCPOMATIC_ASSERT (reel_sound_asset);
 493         if (reel_sound_asset->actual_duration() != period_duration) {
 494                 LOG_ERROR (
 495                         "Reel sound asset has length %1 but reel period is %2",
 496                         reel_sound_asset->actual_duration(),
 497                         period_duration
 498                         );
 499                 if (reel_sound_asset->actual_duration() != period_duration) {
 500                         throw ProgrammingError (
 501                                 __FILE__, __LINE__,
 502                                 String::compose ("%1 vs %2", reel_sound_asset->actual_duration(), period_duration)
 503                                 );
 504                 }
 505
 506         }
 507         reel->add (reel_sound_asset);
 508
 509         maybe_add_text<dcp::ReelSubtitleAsset> (_subtitle_asset, reel_picture_asset->actual_duration(), reel, refs, fonts, _film, _period);
 510         for (map<DCPTextTrack, shared_ptr<dcp::SubtitleAsset> >::const_iterator i = _closed_caption_assets.begin(); i != _closed_caption_assets.end(); ++i) {
 511                 shared_ptr<dcp::ReelClosedCaptionAsset> a = maybe_add_text<dcp::ReelClosedCaptionAsset> (
 512                         i->second, reel_picture_asset->actual_duration(), reel, refs, fonts, _film, _period
 513                         );
 514                 a->set_annotation_text (i->first.name);
 515                 a->set_language (i->first.language);
 516         }
 517
 518         map<dcp::Marker, DCPTime> markers = _film->markers ();
 519         map<dcp::Marker, DCPTime> reel_markers;
 520         for (map<dcp::Marker, DCPTime>::const_iterator i = markers.begin(); i != markers.end(); ++i) {
 521                 if (_period.contains(i->second)) {
 522                         reel_markers[i->first] = i->second;
 523                 }
 524         }
 525
 526         if (!reel_markers.empty ()) {
 527                 shared_ptr<dcp::ReelMarkersAsset> ma (new dcp::ReelMarkersAsset(dcp::Fraction(_film->video_frame_rate(), 1), 0));
 528                 for (map<dcp::Marker, DCPTime>::const_iterator i = reel_markers.begin(); i != reel_markers.end(); ++i) {
 529                         int h, m, s, f;
 530                         DCPTime relative = i->second - _period.from;
 531                         relative.split (_film->video_frame_rate(), h, m, s, f);
 532                         ma->set (i->first, dcp::Time(h, m, s, f, _film->video_frame_rate()));
 533                 }
 534                 reel->add (ma);
 535         }
 536
 537         return reel;
 538 }
 539
 540 void
 541 ReelWriter::calculate_digests (boost::function<void (float)> set_progress)
 542 {
 543         if (_picture_asset) {
 544                 _picture_asset->hash (set_progress);
 545         }
 546
 547         if (_sound_asset) {
 548                 _sound_asset->hash (set_progress);
 549         }
 550 }
 551
 552 Frame
 553 ReelWriter::start () const
 554 {
 555         return _period.from.frames_floor (_film->video_frame_rate());
 556 }
 557
 558
 559 void
 560 ReelWriter::write (shared_ptr<const AudioBuffers> audio)
 561 {
 562         if (!_sound_asset_writer) {
 563                 return;
 564         }
 565
 566         DCPOMATIC_ASSERT (audio);
 567         _sound_asset_writer->write (audio->data(), audio->frames());
 568 }
 569
 570 void
 571 ReelWriter::write (PlayerText subs, TextType type, optional<DCPTextTrack> track, DCPTimePeriod period)
 572 {
 573         shared_ptr<dcp::SubtitleAsset> asset;
 574
 575         switch (type) {
 576         case TEXT_OPEN_SUBTITLE:
 577                 asset = _subtitle_asset;
 578                 break;
 579         case TEXT_CLOSED_CAPTION:
 580                 DCPOMATIC_ASSERT (track);
 581                 asset = _closed_caption_assets[*track];
 582                 break;
 583         default:
 584                 DCPOMATIC_ASSERT (false);
 585         }
 586
 587         if (!asset) {
 588                 string lang = _film->subtitle_language ();
 589                 if (_film->interop ()) {
 590                         shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
 591                         s->set_movie_title (_film->name ());
 592                         if (type == TEXT_OPEN_SUBTITLE) {
 593                                 s->set_language (lang.empty() ? "Unknown" : lang);
 594                         } else {
 595                                 s->set_language (track->language);
 596                         }
 597                         s->set_reel_number (raw_convert<string> (_reel_index + 1));
 598                         asset = s;
 599                 } else {
 600                         shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
 601                         s->set_content_title_text (_film->name ());
 602                         if (type == TEXT_OPEN_SUBTITLE && !lang.empty()) {
 603                                 s->set_language (lang);
 604                         } else {
 605                                 s->set_language (track->language);
 606                         }
 607                         s->set_edit_rate (dcp::Fraction (_film->video_frame_rate (), 1));
 608                         s->set_reel_number (_reel_index + 1);
 609                         s->set_time_code_rate (_film->video_frame_rate ());
 610                         s->set_start_time (dcp::Time ());
 611                         if (_film->encrypted ()) {
 612                                 s->set_key (_film->key ());
 613                         }
 614                         asset = s;
 615                 }
 616         }
 617
 618         switch (type) {
 619         case TEXT_OPEN_SUBTITLE:
 620                 _subtitle_asset = asset;
 621                 break;
 622         case TEXT_CLOSED_CAPTION:
 623                 DCPOMATIC_ASSERT (track);
 624                 _closed_caption_assets[*track] = asset;
 625                 break;
 626         default:
 627                 DCPOMATIC_ASSERT (false);
 628         }
 629
 630         BOOST_FOREACH (StringText i, subs.string) {
 631                 /* XXX: couldn't / shouldn't we use period here rather than getting time from the subtitle? */
 632                 i.set_in  (i.in()  - dcp::Time (_period.from.seconds(), i.in().tcr));
 633                 i.set_out (i.out() - dcp::Time (_period.from.seconds(), i.out().tcr));
 634                 asset->add (shared_ptr<dcp::Subtitle>(new dcp::SubtitleString(i)));
 635         }
 636
 637         BOOST_FOREACH (BitmapText i, subs.bitmap) {
 638                 asset->add (
 639                         shared_ptr<dcp::Subtitle>(
 640                                 new dcp::SubtitleImage(
 641                                         i.image->as_png(),
 642                                         dcp::Time(period.from.seconds(), _film->video_frame_rate()),
 643                                         dcp::Time(period.to.seconds(), _film->video_frame_rate()),
 644                                         i.rectangle.x, dcp::HALIGN_LEFT, i.rectangle.y, dcp::VALIGN_TOP,
 645                                         dcp::Time(), dcp::Time()
 646                                         )
 647                                 )
 648                         );
 649         }
 650 }
 651
 652 bool
 653 ReelWriter::existing_picture_frame_ok (FILE* asset_file, FILE* info_file, Frame frame) const
 654 {
 655         LOG_GENERAL ("Checking existing picture frame %1", frame);
 656
 657         /* Read the data from the info file; for 3D we just check the left
 658            frames until we find a good one.
 659         */
 660         dcp::FrameInfo const info = read_frame_info (info_file, frame, _film->three_d () ? EYES_LEFT : EYES_BOTH);
 661
 662         bool ok = true;
 663
 664         /* Read the data from the asset and hash it */
 665         dcpomatic_fseek (asset_file, info.offset, SEEK_SET);
 666         Data data (info.size);
 667         size_t const read = fread (data.data().get(), 1, data.size(), asset_file);
 668         LOG_GENERAL ("Read %1 bytes of asset data; wanted %2", read, info.size);
 669         if (read != static_cast<size_t> (data.size ())) {
 670                 LOG_GENERAL ("Existing frame %1 is incomplete", frame);
 671                 ok = false;
 672         } else {
 673                 Digester digester;
 674                 digester.add (data.data().get(), data.size());
 675                 LOG_GENERAL ("Hash %1 vs %2", digester.get(), info.hash);
 676                 if (digester.get() != info.hash) {
 677                         LOG_GENERAL ("Existing frame %1 failed hash check", frame);
 678                         ok = false;
 679                 }
 680         }
 681
 682         return ok;
 683 }