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::exception;
  58 using std::map;
  59 using boost::shared_ptr;
  60 using boost::optional;
  61 using boost::dynamic_pointer_cast;
  62 using dcp::Data;
  63 using dcp::raw_convert;
  64 using namespace dcpomatic;
  65
  66 int const ReelWriter::_info_size = 48;
  67
  68 /** @param job Related job, or 0 */
  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         , _job (job)
  80 {
  81         /* Create our picture asset in a subdirectory, named according to those
  82            film's parameters which affect the video output.  We will hard-link
  83            it into the DCP later.
  84         */
  85
  86         dcp::Standard const standard = _film->interop() ? dcp::INTEROP : dcp::SMPTE;
  87
  88         if (_film->three_d ()) {
  89                 _picture_asset.reset (new dcp::StereoPictureAsset (dcp::Fraction (_film->video_frame_rate(), 1), standard));
  90         } else {
  91                 _picture_asset.reset (new dcp::MonoPictureAsset (dcp::Fraction (_film->video_frame_rate(), 1), standard));
  92         }
  93
  94         _picture_asset->set_size (_film->frame_size ());
  95
  96         if (_film->encrypted ()) {
  97                 _picture_asset->set_key (_film->key ());
  98                 _picture_asset->set_context_id (_film->context_id ());
  99         }
 100
 101         _picture_asset->set_file (
 102                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(_period)
 103                 );
 104
 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         shared_ptr<InfoFileHandle> handle = _film->info_file_handle(_period, false);
 137         dcpomatic_fseek (handle->get(), frame_info_position(frame, eyes), SEEK_SET);
 138         checked_fwrite (&info.offset, sizeof(info.offset), handle->get(), handle->file());
 139         checked_fwrite (&info.size, sizeof (info.size), handle->get(), handle->file());
 140         checked_fwrite (info.hash.c_str(), info.hash.size(), handle->get(), handle->file());
 141 }
 142
 143 dcp::FrameInfo
 144 ReelWriter::read_frame_info (shared_ptr<InfoFileHandle> info, Frame frame, Eyes eyes) const
 145 {
 146         dcp::FrameInfo frame_info;
 147         dcpomatic_fseek (info->get(), frame_info_position(frame, eyes), SEEK_SET);
 148         checked_fread (&frame_info.offset, sizeof(frame_info.offset), info->get(), info->file());
 149         checked_fread (&frame_info.size, sizeof(frame_info.size), info->get(), info->file());
 150
 151         char hash_buffer[33];
 152         checked_fread (hash_buffer, 32, info->get(), info->file());
 153         hash_buffer[32] = '\0';
 154         frame_info.hash = hash_buffer;
 155
 156         return frame_info;
 157 }
 158
 159 long
 160 ReelWriter::frame_info_position (Frame frame, Eyes eyes) const
 161 {
 162         switch (eyes) {
 163         case EYES_BOTH:
 164                 return frame * _info_size;
 165         case EYES_LEFT:
 166                 return frame * _info_size * 2;
 167         case EYES_RIGHT:
 168                 return frame * _info_size * 2 + _info_size;
 169         default:
 170                 DCPOMATIC_ASSERT (false);
 171         }
 172
 173         DCPOMATIC_ASSERT (false);
 174 }
 175
 176 Frame
 177 ReelWriter::check_existing_picture_asset ()
 178 {
 179         DCPOMATIC_ASSERT (_picture_asset->file());
 180         boost::filesystem::path asset = _picture_asset->file().get();
 181
 182         shared_ptr<Job> job = _job.lock ();
 183
 184         /* If there is an existing asset, break any hard links to it as we are about to change its contents
 185            (if only by changing the IDs); see #1126.
 186         */
 187
 188         if (boost::filesystem::exists(asset) && boost::filesystem::hard_link_count(asset) > 1) {
 189                 if (job) {
 190                         job->sub (_("Copying old video file"));
 191                         copy_in_bits (asset, asset.string() + ".tmp", bind(&Job::set_progress, job.get(), _1, false));
 192                 } else {
 193                         boost::filesystem::copy_file (asset, asset.string() + ".tmp");
 194                 }
 195                 boost::filesystem::remove (asset);
 196                 boost::filesystem::rename (asset.string() + ".tmp", asset);
 197         }
 198
 199         if (job) {
 200                 job->sub (_("Checking existing image data"));
 201         }
 202
 203         /* Try to open the existing asset */
 204         FILE* asset_file = fopen_boost (asset, "rb");
 205         if (!asset_file) {
 206                 LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", asset.string(), errno);
 207                 return 0;
 208         } else {
 209                 LOG_GENERAL ("Opened existing asset at %1", asset.string());
 210         }
 211
 212         shared_ptr<InfoFileHandle> info_file;
 213
 214         try {
 215                 info_file = _film->info_file_handle (_period, true);
 216         } catch (OpenFileError) {
 217                 LOG_GENERAL_NC ("Could not open film info file");
 218                 fclose (asset_file);
 219                 return 0;
 220         }
 221
 222         /* Offset of the last dcp::FrameInfo in the info file */
 223         int const n = (boost::filesystem::file_size(info_file->file()) / _info_size) - 1;
 224         LOG_GENERAL ("The last FI is %1; info file is %2, info size %3", n, boost::filesystem::file_size(info_file->file()), _info_size);
 225
 226         Frame first_nonexistant_frame;
 227         if (_film->three_d ()) {
 228                 /* Start looking at the last left frame */
 229                 first_nonexistant_frame = n / 2;
 230         } else {
 231                 first_nonexistant_frame = n;
 232         }
 233
 234         while (!existing_picture_frame_ok(asset_file, info_file, first_nonexistant_frame) && first_nonexistant_frame > 0) {
 235                 --first_nonexistant_frame;
 236         }
 237
 238         if (!_film->three_d() && first_nonexistant_frame > 0) {
 239                 /* If we are doing 3D we might have found a good L frame with no R, so only
 240                    do this if we're in 2D and we've just found a good B(oth) frame.
 241                 */
 242                 ++first_nonexistant_frame;
 243         }
 244
 245         LOG_GENERAL ("Proceeding with first nonexistant frame %1", first_nonexistant_frame);
 246
 247         fclose (asset_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                         shared_ptr<Job> job = _job.lock ();
 309                         if (job) {
 310                                 job->sub (_("Copying video file into DCP"));
 311                                 try {
 312                                         copy_in_bits (video_from, video_to, bind(&Job::set_progress, job.get(), _1, false));
 313                                 } catch (exception& e) {
 314                                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), e.what());
 315                                         throw FileError (e.what(), video_from);
 316                                 }
 317                         } else {
 318                                 boost::filesystem::copy_file (video_from, video_to, ec);
 319                                 if (ec) {
 320                                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 321                                         throw FileError (ec.message(), video_from);
 322                                 }
 323                         }
 324                 }
 325
 326                 _picture_asset->set_file (video_to);
 327         }
 328
 329         /* Move the audio asset into the DCP */
 330         if (_sound_asset) {
 331                 boost::filesystem::path audio_to;
 332                 audio_to /= _film->dir (_film->dcp_name ());
 333                 string const aaf = audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary);
 334                 audio_to /= aaf;
 335
 336                 boost::system::error_code ec;
 337                 boost::filesystem::rename (_film->file (aaf), audio_to, ec);
 338                 if (ec) {
 339                         throw FileError (
 340                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), aaf
 341                                 );
 342                 }
 343
 344                 _sound_asset->set_file (audio_to);
 345         }
 346 }
 347
 348 template <class T>
 349 shared_ptr<T>
 350 maybe_add_text (
 351         shared_ptr<dcp::SubtitleAsset> asset,
 352         int64_t picture_duration,
 353         shared_ptr<dcp::Reel> reel,
 354         list<ReferencedReelAsset> const & refs,
 355         list<shared_ptr<Font> > const & fonts,
 356         shared_ptr<const Film> film,
 357         DCPTimePeriod period
 358         )
 359 {
 360         Frame const period_duration = period.duration().frames_round(film->video_frame_rate());
 361
 362         shared_ptr<T> reel_asset;
 363
 364         if (asset) {
 365                 boost::filesystem::path liberation_normal;
 366                 try {
 367                         liberation_normal = shared_path() / "LiberationSans-Regular.ttf";
 368                         if (!boost::filesystem::exists (liberation_normal)) {
 369                                 /* Hack for unit tests */
 370                                 liberation_normal = shared_path() / "fonts" / "LiberationSans-Regular.ttf";
 371                         }
 372                 } catch (boost::filesystem::filesystem_error& e) {
 373
 374                 }
 375
 376                 if (!boost::filesystem::exists(liberation_normal)) {
 377                         liberation_normal = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf";
 378                 }
 379
 380                 /* Add the font to the subtitle content */
 381                 BOOST_FOREACH (shared_ptr<Font> j, fonts) {
 382                         asset->add_font (j->id(), j->file().get_value_or(liberation_normal));
 383                 }
 384
 385                 if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (asset)) {
 386                         boost::filesystem::path directory = film->dir (film->dcp_name ()) / asset->id ();
 387                         boost::filesystem::create_directories (directory);
 388                         asset->write (directory / ("sub_" + asset->id() + ".xml"));
 389                 } else {
 390                         /* All our assets should be the same length; use the picture asset length here
 391                            as a reference to set the subtitle one.  We'll use the duration rather than
 392                            the intrinsic duration; we don't care if the picture asset has been trimmed, we're
 393                            just interested in its presentation length.
 394                         */
 395                         dynamic_pointer_cast<dcp::SMPTESubtitleAsset>(asset)->set_intrinsic_duration (picture_duration);
 396
 397                         asset->write (
 398                                 film->dir(film->dcp_name()) / ("sub_" + asset->id() + ".mxf")
 399                                 );
 400                 }
 401
 402                 reel_asset.reset (
 403                         new T (
 404                                 asset,
 405                                 dcp::Fraction (film->video_frame_rate(), 1),
 406                                 picture_duration,
 407                                 0
 408                                 )
 409                         );
 410         } else {
 411                 /* We don't have a subtitle asset of our own; hopefully we have one to reference */
 412                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 413                         shared_ptr<T> k = dynamic_pointer_cast<T> (j.asset);
 414                         if (k && j.period == period) {
 415                                 reel_asset = k;
 416                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 417                                 if (k->hash()) {
 418                                         k->asset_ref()->set_hash (k->hash().get());
 419                                 }
 420                         }
 421                 }
 422         }
 423
 424         if (reel_asset) {
 425                 if (reel_asset->actual_duration() != period_duration) {
 426                         throw ProgrammingError (
 427                                 __FILE__, __LINE__,
 428                                 String::compose ("%1 vs %2", reel_asset->actual_duration(), period_duration)
 429                                 );
 430                 }
 431                 reel->add (reel_asset);
 432         }
 433
 434         return reel_asset;
 435 }
 436
 437 shared_ptr<dcp::Reel>
 438 ReelWriter::create_reel (list<ReferencedReelAsset> const & refs, list<shared_ptr<Font> > const & fonts)
 439 {
 440         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 441
 442         shared_ptr<dcp::ReelPictureAsset> reel_picture_asset;
 443
 444         if (_picture_asset) {
 445                 /* We have made a picture asset of our own.  Put it into the reel */
 446                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 447                 if (mono) {
 448                         reel_picture_asset.reset (new dcp::ReelMonoPictureAsset (mono, 0));
 449                 }
 450
 451                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 452                 if (stereo) {
 453                         reel_picture_asset.reset (new dcp::ReelStereoPictureAsset (stereo, 0));
 454                 }
 455         } else {
 456                 LOG_GENERAL ("no picture asset of our own; look through %1", refs.size());
 457                 /* We don't have a picture asset of our own; hopefully we have one to reference */
 458                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 459                         shared_ptr<dcp::ReelPictureAsset> k = dynamic_pointer_cast<dcp::ReelPictureAsset> (j.asset);
 460                         if (k) {
 461                                 LOG_GENERAL ("candidate picture asset period is %1-%2", j.period.from.get(), j.period.to.get());
 462                         }
 463                         if (k && j.period == _period) {
 464                                 reel_picture_asset = k;
 465                         }
 466                 }
 467         }
 468
 469         LOG_GENERAL ("create_reel for %1-%2; %3 of %4", _period.from.get(), _period.to.get(), _reel_index, _reel_count);
 470
 471         Frame const period_duration = _period.duration().frames_round(_film->video_frame_rate());
 472
 473         DCPOMATIC_ASSERT (reel_picture_asset);
 474         if (reel_picture_asset->duration() != period_duration) {
 475                 throw ProgrammingError (
 476                         __FILE__, __LINE__,
 477                         String::compose ("%1 vs %2", reel_picture_asset->actual_duration(), period_duration)
 478                         );
 479         }
 480         reel->add (reel_picture_asset);
 481
 482         /* If we have a hash for this asset in the CPL, assume that it is correct */
 483         if (reel_picture_asset->hash()) {
 484                 reel_picture_asset->asset_ref()->set_hash (reel_picture_asset->hash().get());
 485         }
 486
 487         shared_ptr<dcp::ReelSoundAsset> reel_sound_asset;
 488
 489         if (_sound_asset) {
 490                 /* We have made a sound asset of our own.  Put it into the reel */
 491                 reel_sound_asset.reset (new dcp::ReelSoundAsset (_sound_asset, 0));
 492         } else {
 493                 /* We don't have a sound asset of our own; hopefully we have one to reference */
 494                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 495                         shared_ptr<dcp::ReelSoundAsset> k = dynamic_pointer_cast<dcp::ReelSoundAsset> (j.asset);
 496                         if (k && j.period == _period) {
 497                                 reel_sound_asset = k;
 498                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 499                                 if (k->hash()) {
 500                                         k->asset_ref()->set_hash (k->hash().get());
 501                                 }
 502                         }
 503                 }
 504         }
 505
 506         DCPOMATIC_ASSERT (reel_sound_asset);
 507         if (reel_sound_asset->actual_duration() != period_duration) {
 508                 LOG_ERROR (
 509                         "Reel sound asset has length %1 but reel period is %2",
 510                         reel_sound_asset->actual_duration(),
 511                         period_duration
 512                         );
 513                 if (reel_sound_asset->actual_duration() != period_duration) {
 514                         throw ProgrammingError (
 515                                 __FILE__, __LINE__,
 516                                 String::compose ("%1 vs %2", reel_sound_asset->actual_duration(), period_duration)
 517                                 );
 518                 }
 519
 520         }
 521         reel->add (reel_sound_asset);
 522
 523         maybe_add_text<dcp::ReelSubtitleAsset> (_subtitle_asset, reel_picture_asset->actual_duration(), reel, refs, fonts, _film, _period);
 524         for (map<DCPTextTrack, shared_ptr<dcp::SubtitleAsset> >::const_iterator i = _closed_caption_assets.begin(); i != _closed_caption_assets.end(); ++i) {
 525                 shared_ptr<dcp::ReelClosedCaptionAsset> a = maybe_add_text<dcp::ReelClosedCaptionAsset> (
 526                         i->second, reel_picture_asset->actual_duration(), reel, refs, fonts, _film, _period
 527                         );
 528                 a->set_annotation_text (i->first.name);
 529                 a->set_language (i->first.language);
 530         }
 531
 532         map<dcp::Marker, DCPTime> markers = _film->markers ();
 533         map<dcp::Marker, DCPTime> reel_markers;
 534         for (map<dcp::Marker, DCPTime>::const_iterator i = markers.begin(); i != markers.end(); ++i) {
 535                 if (_period.contains(i->second)) {
 536                         reel_markers[i->first] = i->second;
 537                 }
 538         }
 539
 540         if (!reel_markers.empty ()) {
 541                 shared_ptr<dcp::ReelMarkersAsset> ma (new dcp::ReelMarkersAsset(dcp::Fraction(_film->video_frame_rate(), 1), 0));
 542                 for (map<dcp::Marker, DCPTime>::const_iterator i = reel_markers.begin(); i != reel_markers.end(); ++i) {
 543                         int h, m, s, f;
 544                         DCPTime relative = i->second - _period.from;
 545                         relative.split (_film->video_frame_rate(), h, m, s, f);
 546                         ma->set (i->first, dcp::Time(h, m, s, f, _film->video_frame_rate()));
 547                 }
 548                 reel->add (ma);
 549         }
 550
 551         return reel;
 552 }
 553
 554 void
 555 ReelWriter::calculate_digests (boost::function<void (float)> set_progress)
 556 {
 557         if (_picture_asset) {
 558                 _picture_asset->hash (set_progress);
 559         }
 560
 561         if (_sound_asset) {
 562                 _sound_asset->hash (set_progress);
 563         }
 564 }
 565
 566 Frame
 567 ReelWriter::start () const
 568 {
 569         return _period.from.frames_floor (_film->video_frame_rate());
 570 }
 571
 572
 573 void
 574 ReelWriter::write (shared_ptr<const AudioBuffers> audio)
 575 {
 576         if (!_sound_asset_writer) {
 577                 return;
 578         }
 579
 580         DCPOMATIC_ASSERT (audio);
 581         _sound_asset_writer->write (audio->data(), audio->frames());
 582 }
 583
 584 void
 585 ReelWriter::write (PlayerText subs, TextType type, optional<DCPTextTrack> track, DCPTimePeriod period)
 586 {
 587         shared_ptr<dcp::SubtitleAsset> asset;
 588
 589         switch (type) {
 590         case TEXT_OPEN_SUBTITLE:
 591                 asset = _subtitle_asset;
 592                 break;
 593         case TEXT_CLOSED_CAPTION:
 594                 DCPOMATIC_ASSERT (track);
 595                 asset = _closed_caption_assets[*track];
 596                 break;
 597         default:
 598                 DCPOMATIC_ASSERT (false);
 599         }
 600
 601         if (!asset) {
 602                 string lang = _film->subtitle_language ();
 603                 if (_film->interop ()) {
 604                         shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
 605                         s->set_movie_title (_film->name ());
 606                         if (type == TEXT_OPEN_SUBTITLE) {
 607                                 s->set_language (lang.empty() ? "Unknown" : lang);
 608                         } else {
 609                                 s->set_language (track->language);
 610                         }
 611                         s->set_reel_number (raw_convert<string> (_reel_index + 1));
 612                         asset = s;
 613                 } else {
 614                         shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
 615                         s->set_content_title_text (_film->name ());
 616                         if (type == TEXT_OPEN_SUBTITLE && !lang.empty()) {
 617                                 s->set_language (lang);
 618                         } else {
 619                                 s->set_language (track->language);
 620                         }
 621                         s->set_edit_rate (dcp::Fraction (_film->video_frame_rate (), 1));
 622                         s->set_reel_number (_reel_index + 1);
 623                         s->set_time_code_rate (_film->video_frame_rate ());
 624                         s->set_start_time (dcp::Time ());
 625                         if (_film->encrypted ()) {
 626                                 s->set_key (_film->key ());
 627                         }
 628                         asset = s;
 629                 }
 630         }
 631
 632         switch (type) {
 633         case TEXT_OPEN_SUBTITLE:
 634                 _subtitle_asset = asset;
 635                 break;
 636         case TEXT_CLOSED_CAPTION:
 637                 DCPOMATIC_ASSERT (track);
 638                 _closed_caption_assets[*track] = asset;
 639                 break;
 640         default:
 641                 DCPOMATIC_ASSERT (false);
 642         }
 643
 644         BOOST_FOREACH (StringText i, subs.string) {
 645                 /* XXX: couldn't / shouldn't we use period here rather than getting time from the subtitle? */
 646                 i.set_in  (i.in()  - dcp::Time (_period.from.seconds(), i.in().tcr));
 647                 i.set_out (i.out() - dcp::Time (_period.from.seconds(), i.out().tcr));
 648                 asset->add (shared_ptr<dcp::Subtitle>(new dcp::SubtitleString(i)));
 649         }
 650
 651         BOOST_FOREACH (BitmapText i, subs.bitmap) {
 652                 asset->add (
 653                         shared_ptr<dcp::Subtitle>(
 654                                 new dcp::SubtitleImage(
 655                                         i.image->as_png(),
 656                                         dcp::Time(period.from.seconds() - _period.from.seconds(), _film->video_frame_rate()),
 657                                         dcp::Time(period.to.seconds() - _period.from.seconds(), _film->video_frame_rate()),
 658                                         i.rectangle.x, dcp::HALIGN_LEFT, i.rectangle.y, dcp::VALIGN_TOP,
 659                                         dcp::Time(), dcp::Time()
 660                                         )
 661                                 )
 662                         );
 663         }
 664 }
 665
 666 bool
 667 ReelWriter::existing_picture_frame_ok (FILE* asset_file, shared_ptr<InfoFileHandle> info_file, Frame frame) const
 668 {
 669         LOG_GENERAL ("Checking existing picture frame %1", frame);
 670
 671         /* Read the data from the info file; for 3D we just check the left
 672            frames until we find a good one.
 673         */
 674         dcp::FrameInfo const info = read_frame_info (info_file, frame, _film->three_d () ? EYES_LEFT : EYES_BOTH);
 675
 676         bool ok = true;
 677
 678         /* Read the data from the asset and hash it */
 679         dcpomatic_fseek (asset_file, info.offset, SEEK_SET);
 680         Data data (info.size);
 681         size_t const read = fread (data.data().get(), 1, data.size(), asset_file);
 682         LOG_GENERAL ("Read %1 bytes of asset data; wanted %2", read, info.size);
 683         if (read != static_cast<size_t> (data.size ())) {
 684                 LOG_GENERAL ("Existing frame %1 is incomplete", frame);
 685                 ok = false;
 686         } else {
 687                 Digester digester;
 688                 digester.add (data.data().get(), data.size());
 689                 LOG_GENERAL ("Hash %1 vs %2", digester.get(), info.hash);
 690                 if (digester.get() != info.hash) {
 691                         LOG_GENERAL ("Existing frame %1 failed hash check", frame);
 692                         ok = false;
 693                 }
 694         }
 695
 696         return ok;
 697 }