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/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 using namespace dcpomatic;
  64
  65 int const ReelWriter::_info_size = 48;
  66
  67 /** @param job Related job, or 0 */
  68 ReelWriter::ReelWriter (
  69         shared_ptr<const Film> film, DCPTimePeriod period, shared_ptr<Job> job, int reel_index, int reel_count, optional<string> content_summary
  70         )
  71         : _film (film)
  72         , _period (period)
  73         , _last_written_video_frame (-1)
  74         , _last_written_eyes (EYES_RIGHT)
  75         , _reel_index (reel_index)
  76         , _reel_count (reel_count)
  77         , _content_summary (content_summary)
  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         if (job) {
 104                 job->sub (_("Checking existing image data"));
 105         }
 106         _first_nonexistant_frame = check_existing_picture_asset ();
 107
 108         _picture_asset_writer = _picture_asset->start_write (
 109                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(_period),
 110                 _first_nonexistant_frame > 0
 111                 );
 112
 113         if (_film->audio_channels ()) {
 114                 _sound_asset.reset (
 115                         new dcp::SoundAsset (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels (), standard)
 116                         );
 117
 118                 if (_film->encrypted ()) {
 119                         _sound_asset->set_key (_film->key ());
 120                 }
 121
 122                 DCPOMATIC_ASSERT (_film->directory());
 123
 124                 /* Write the sound asset into the film directory so that we leave the creation
 125                    of the DCP directory until the last minute.
 126                 */
 127                 _sound_asset_writer = _sound_asset->start_write (
 128                         _film->directory().get() / audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary)
 129                         );
 130         }
 131 }
 132
 133 /** @param frame reel-relative frame */
 134 void
 135 ReelWriter::write_frame_info (Frame frame, Eyes eyes, dcp::FrameInfo info) const
 136 {
 137         shared_ptr<InfoFileHandle> handle = _film->info_file_handle(_period, false);
 138         dcpomatic_fseek (handle->get(), frame_info_position(frame, eyes), SEEK_SET);
 139         checked_fwrite (&info.offset, sizeof(info.offset), handle->get(), handle->file());
 140         checked_fwrite (&info.size, sizeof (info.size), handle->get(), handle->file());
 141         checked_fwrite (info.hash.c_str(), info.hash.size(), handle->get(), handle->file());
 142 }
 143
 144 dcp::FrameInfo
 145 ReelWriter::read_frame_info (shared_ptr<InfoFileHandle> info, Frame frame, Eyes eyes) const
 146 {
 147         dcp::FrameInfo frame_info;
 148         dcpomatic_fseek (info->get(), frame_info_position(frame, eyes), SEEK_SET);
 149         checked_fread (&frame_info.offset, sizeof(frame_info.offset), info->get(), info->file());
 150         checked_fread (&frame_info.size, sizeof(frame_info.size), info->get(), info->file());
 151
 152         char hash_buffer[33];
 153         checked_fread (hash_buffer, 32, info->get(), info->file());
 154         hash_buffer[32] = '\0';
 155         frame_info.hash = hash_buffer;
 156
 157         return frame_info;
 158 }
 159
 160 long
 161 ReelWriter::frame_info_position (Frame frame, Eyes eyes) const
 162 {
 163         switch (eyes) {
 164         case EYES_BOTH:
 165                 return frame * _info_size;
 166         case EYES_LEFT:
 167                 return frame * _info_size * 2;
 168         case EYES_RIGHT:
 169                 return frame * _info_size * 2 + _info_size;
 170         default:
 171                 DCPOMATIC_ASSERT (false);
 172         }
 173
 174         DCPOMATIC_ASSERT (false);
 175 }
 176
 177 Frame
 178 ReelWriter::check_existing_picture_asset ()
 179 {
 180         DCPOMATIC_ASSERT (_picture_asset->file());
 181         boost::filesystem::path asset = _picture_asset->file().get();
 182
 183         /* If there is an existing asset, break any hard links to it as we are about to change its contents
 184            (if only by changing the IDs); see #1126.
 185         */
 186
 187         if (boost::filesystem::exists(asset) && boost::filesystem::hard_link_count(asset) > 1) {
 188                 boost::filesystem::copy_file (asset, asset.string() + ".tmp");
 189                 boost::filesystem::remove (asset);
 190                 boost::filesystem::rename (asset.string() + ".tmp", asset);
 191         }
 192
 193         /* Try to open the existing asset */
 194         FILE* asset_file = fopen_boost (asset, "rb");
 195         if (!asset_file) {
 196                 LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", asset.string(), errno);
 197                 return 0;
 198         } else {
 199                 LOG_GENERAL ("Opened existing asset at %1", asset.string());
 200         }
 201
 202         shared_ptr<InfoFileHandle> info_file;
 203
 204         try {
 205                 info_file = _film->info_file_handle (_period, true);
 206         } catch (OpenFileError) {
 207                 LOG_GENERAL_NC ("Could not open film info file");
 208                 fclose (asset_file);
 209                 return 0;
 210         }
 211
 212         /* Offset of the last dcp::FrameInfo in the info file */
 213         int const n = (boost::filesystem::file_size(info_file->file()) / _info_size) - 1;
 214         LOG_GENERAL ("The last FI is %1; info file is %2, info size %3", n, boost::filesystem::file_size(info_file->file()), _info_size);
 215
 216         Frame first_nonexistant_frame;
 217         if (_film->three_d ()) {
 218                 /* Start looking at the last left frame */
 219                 first_nonexistant_frame = n / 2;
 220         } else {
 221                 first_nonexistant_frame = n;
 222         }
 223
 224         while (!existing_picture_frame_ok(asset_file, info_file, first_nonexistant_frame) && first_nonexistant_frame > 0) {
 225                 --first_nonexistant_frame;
 226         }
 227
 228         if (!_film->three_d() && first_nonexistant_frame > 0) {
 229                 /* If we are doing 3D we might have found a good L frame with no R, so only
 230                    do this if we're in 2D and we've just found a good B(oth) frame.
 231                 */
 232                 ++first_nonexistant_frame;
 233         }
 234
 235         LOG_GENERAL ("Proceeding with first nonexistant frame %1", first_nonexistant_frame);
 236
 237         fclose (asset_file);
 238
 239         return first_nonexistant_frame;
 240 }
 241
 242 void
 243 ReelWriter::write (optional<Data> encoded, Frame frame, Eyes eyes)
 244 {
 245         dcp::FrameInfo fin = _picture_asset_writer->write (encoded->data().get (), encoded->size());
 246         write_frame_info (frame, eyes, fin);
 247         _last_written[eyes] = encoded;
 248         _last_written_video_frame = frame;
 249         _last_written_eyes = eyes;
 250 }
 251
 252 void
 253 ReelWriter::fake_write (Frame frame, Eyes eyes, int size)
 254 {
 255         _picture_asset_writer->fake_write (size);
 256         _last_written_video_frame = frame;
 257         _last_written_eyes = eyes;
 258 }
 259
 260 void
 261 ReelWriter::repeat_write (Frame frame, Eyes eyes)
 262 {
 263         dcp::FrameInfo fin = _picture_asset_writer->write (
 264                 _last_written[eyes]->data().get(),
 265                 _last_written[eyes]->size()
 266                 );
 267         write_frame_info (frame, eyes, fin);
 268         _last_written_video_frame = frame;
 269         _last_written_eyes = eyes;
 270 }
 271
 272 void
 273 ReelWriter::finish ()
 274 {
 275         if (!_picture_asset_writer->finalize ()) {
 276                 /* Nothing was written to the picture asset */
 277                 LOG_GENERAL ("Nothing was written to reel %1 of %2", _reel_index, _reel_count);
 278                 _picture_asset.reset ();
 279         }
 280
 281         if (_sound_asset_writer && !_sound_asset_writer->finalize ()) {
 282                 /* Nothing was written to the sound asset */
 283                 _sound_asset.reset ();
 284         }
 285
 286         /* Hard-link any video asset file into the DCP */
 287         if (_picture_asset) {
 288                 DCPOMATIC_ASSERT (_picture_asset->file());
 289                 boost::filesystem::path video_from = _picture_asset->file().get();
 290                 boost::filesystem::path video_to;
 291                 video_to /= _film->dir (_film->dcp_name());
 292                 video_to /= video_asset_filename (_picture_asset, _reel_index, _reel_count, _content_summary);
 293
 294                 boost::system::error_code ec;
 295                 boost::filesystem::create_hard_link (video_from, video_to, ec);
 296                 if (ec) {
 297                         LOG_WARNING_NC ("Hard-link failed; copying instead");
 298                         boost::filesystem::copy_file (video_from, video_to, ec);
 299                         if (ec) {
 300                                 LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 301                                 throw FileError (ec.message(), video_from);
 302                         }
 303                 }
 304
 305                 _picture_asset->set_file (video_to);
 306         }
 307
 308         /* Move the audio asset into the DCP */
 309         if (_sound_asset) {
 310                 boost::filesystem::path audio_to;
 311                 audio_to /= _film->dir (_film->dcp_name ());
 312                 string const aaf = audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary);
 313                 audio_to /= aaf;
 314
 315                 boost::system::error_code ec;
 316                 boost::filesystem::rename (_film->file (aaf), audio_to, ec);
 317                 if (ec) {
 318                         throw FileError (
 319                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), aaf
 320                                 );
 321                 }
 322
 323                 _sound_asset->set_file (audio_to);
 324         }
 325 }
 326
 327 template <class T>
 328 shared_ptr<T>
 329 maybe_add_text (
 330         shared_ptr<dcp::SubtitleAsset> asset,
 331         int64_t picture_duration,
 332         shared_ptr<dcp::Reel> reel,
 333         list<ReferencedReelAsset> const & refs,
 334         list<shared_ptr<Font> > const & fonts,
 335         shared_ptr<const Film> film,
 336         DCPTimePeriod period
 337         )
 338 {
 339         Frame const period_duration = period.duration().frames_round(film->video_frame_rate());
 340
 341         shared_ptr<T> reel_asset;
 342
 343         if (asset) {
 344                 boost::filesystem::path liberation_normal;
 345                 try {
 346                         liberation_normal = shared_path() / "LiberationSans-Regular.ttf";
 347                         if (!boost::filesystem::exists (liberation_normal)) {
 348                                 /* Hack for unit tests */
 349                                 liberation_normal = shared_path() / "fonts" / "LiberationSans-Regular.ttf";
 350                         }
 351                 } catch (boost::filesystem::filesystem_error& e) {
 352
 353                 }
 354
 355                 if (!boost::filesystem::exists(liberation_normal)) {
 356                         liberation_normal = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf";
 357                 }
 358
 359                 /* Add the font to the subtitle content */
 360                 BOOST_FOREACH (shared_ptr<Font> j, fonts) {
 361                         asset->add_font (j->id(), j->file().get_value_or(liberation_normal));
 362                 }
 363
 364                 if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (asset)) {
 365                         boost::filesystem::path directory = film->dir (film->dcp_name ()) / asset->id ();
 366                         boost::filesystem::create_directories (directory);
 367                         asset->write (directory / ("sub_" + asset->id() + ".xml"));
 368                 } else {
 369                         /* All our assets should be the same length; use the picture asset length here
 370                            as a reference to set the subtitle one.  We'll use the duration rather than
 371                            the intrinsic duration; we don't care if the picture asset has been trimmed, we're
 372                            just interested in its presentation length.
 373                         */
 374                         dynamic_pointer_cast<dcp::SMPTESubtitleAsset>(asset)->set_intrinsic_duration (picture_duration);
 375
 376                         asset->write (
 377                                 film->dir(film->dcp_name()) / ("sub_" + asset->id() + ".mxf")
 378                                 );
 379                 }
 380
 381                 reel_asset.reset (
 382                         new T (
 383                                 asset,
 384                                 dcp::Fraction (film->video_frame_rate(), 1),
 385                                 picture_duration,
 386                                 0
 387                                 )
 388                         );
 389         } else {
 390                 /* We don't have a subtitle asset of our own; hopefully we have one to reference */
 391                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 392                         shared_ptr<T> k = dynamic_pointer_cast<T> (j.asset);
 393                         if (k && j.period == period) {
 394                                 reel_asset = k;
 395                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 396                                 if (k->hash()) {
 397                                         k->asset_ref()->set_hash (k->hash().get());
 398                                 }
 399                         }
 400                 }
 401         }
 402
 403         if (reel_asset) {
 404                 if (reel_asset->actual_duration() != period_duration) {
 405                         throw ProgrammingError (
 406                                 __FILE__, __LINE__,
 407                                 String::compose ("%1 vs %2", reel_asset->actual_duration(), period_duration)
 408                                 );
 409                 }
 410                 reel->add (reel_asset);
 411         }
 412
 413         return reel_asset;
 414 }
 415
 416 shared_ptr<dcp::Reel>
 417 ReelWriter::create_reel (list<ReferencedReelAsset> const & refs, list<shared_ptr<Font> > const & fonts)
 418 {
 419         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 420
 421         shared_ptr<dcp::ReelPictureAsset> reel_picture_asset;
 422
 423         if (_picture_asset) {
 424                 /* We have made a picture asset of our own.  Put it into the reel */
 425                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 426                 if (mono) {
 427                         reel_picture_asset.reset (new dcp::ReelMonoPictureAsset (mono, 0));
 428                 }
 429
 430                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 431                 if (stereo) {
 432                         reel_picture_asset.reset (new dcp::ReelStereoPictureAsset (stereo, 0));
 433                 }
 434         } else {
 435                 LOG_GENERAL ("no picture asset of our own; look through %1", refs.size());
 436                 /* We don't have a picture asset of our own; hopefully we have one to reference */
 437                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 438                         shared_ptr<dcp::ReelPictureAsset> k = dynamic_pointer_cast<dcp::ReelPictureAsset> (j.asset);
 439                         if (k) {
 440                                 LOG_GENERAL ("candidate picture asset period is %1-%2", j.period.from.get(), j.period.to.get());
 441                         }
 442                         if (k && j.period == _period) {
 443                                 reel_picture_asset = k;
 444                         }
 445                 }
 446         }
 447
 448         LOG_GENERAL ("create_reel for %1-%2; %3 of %4", _period.from.get(), _period.to.get(), _reel_index, _reel_count);
 449
 450         Frame const period_duration = _period.duration().frames_round(_film->video_frame_rate());
 451
 452         DCPOMATIC_ASSERT (reel_picture_asset);
 453         if (reel_picture_asset->duration() != period_duration) {
 454                 throw ProgrammingError (
 455                         __FILE__, __LINE__,
 456                         String::compose ("%1 vs %2", reel_picture_asset->actual_duration(), period_duration)
 457                         );
 458         }
 459         reel->add (reel_picture_asset);
 460
 461         /* If we have a hash for this asset in the CPL, assume that it is correct */
 462         if (reel_picture_asset->hash()) {
 463                 reel_picture_asset->asset_ref()->set_hash (reel_picture_asset->hash().get());
 464         }
 465
 466         shared_ptr<dcp::ReelSoundAsset> reel_sound_asset;
 467
 468         if (_sound_asset) {
 469                 /* We have made a sound asset of our own.  Put it into the reel */
 470                 reel_sound_asset.reset (new dcp::ReelSoundAsset (_sound_asset, 0));
 471         } else {
 472                 /* We don't have a sound asset of our own; hopefully we have one to reference */
 473                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 474                         shared_ptr<dcp::ReelSoundAsset> k = dynamic_pointer_cast<dcp::ReelSoundAsset> (j.asset);
 475                         if (k && j.period == _period) {
 476                                 reel_sound_asset = k;
 477                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 478                                 if (k->hash()) {
 479                                         k->asset_ref()->set_hash (k->hash().get());
 480                                 }
 481                         }
 482                 }
 483         }
 484
 485         DCPOMATIC_ASSERT (reel_sound_asset);
 486         if (reel_sound_asset->actual_duration() != period_duration) {
 487                 LOG_ERROR (
 488                         "Reel sound asset has length %1 but reel period is %2",
 489                         reel_sound_asset->actual_duration(),
 490                         period_duration
 491                         );
 492                 if (reel_sound_asset->actual_duration() != period_duration) {
 493                         throw ProgrammingError (
 494                                 __FILE__, __LINE__,
 495                                 String::compose ("%1 vs %2", reel_sound_asset->actual_duration(), period_duration)
 496                                 );
 497                 }
 498
 499         }
 500         reel->add (reel_sound_asset);
 501
 502         maybe_add_text<dcp::ReelSubtitleAsset> (_subtitle_asset, reel_picture_asset->actual_duration(), reel, refs, fonts, _film, _period);
 503         for (map<DCPTextTrack, shared_ptr<dcp::SubtitleAsset> >::const_iterator i = _closed_caption_assets.begin(); i != _closed_caption_assets.end(); ++i) {
 504                 shared_ptr<dcp::ReelClosedCaptionAsset> a = maybe_add_text<dcp::ReelClosedCaptionAsset> (
 505                         i->second, reel_picture_asset->actual_duration(), reel, refs, fonts, _film, _period
 506                         );
 507                 a->set_annotation_text (i->first.name);
 508                 a->set_language (i->first.language);
 509         }
 510
 511         map<dcp::Marker, DCPTime> markers = _film->markers ();
 512         map<dcp::Marker, DCPTime> reel_markers;
 513         for (map<dcp::Marker, DCPTime>::const_iterator i = markers.begin(); i != markers.end(); ++i) {
 514                 if (_period.contains(i->second)) {
 515                         reel_markers[i->first] = i->second;
 516                 }
 517         }
 518
 519         if (!reel_markers.empty ()) {
 520                 shared_ptr<dcp::ReelMarkersAsset> ma (new dcp::ReelMarkersAsset(dcp::Fraction(_film->video_frame_rate(), 1), 0));
 521                 for (map<dcp::Marker, DCPTime>::const_iterator i = reel_markers.begin(); i != reel_markers.end(); ++i) {
 522                         int h, m, s, f;
 523                         DCPTime relative = i->second - _period.from;
 524                         relative.split (_film->video_frame_rate(), h, m, s, f);
 525                         ma->set (i->first, dcp::Time(h, m, s, f, _film->video_frame_rate()));
 526                 }
 527                 reel->add (ma);
 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 }