src/lib/reel_writer.cc

   1 /*
   2     Copyright (C) 2012-2019 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "reel_writer.h"
  22 #include "film.h"
  23 #include "cross.h"
  24 #include "job.h"
  25 #include "log.h"
  26 #include "dcpomatic_log.h"
  27 #include "digester.h"
  28 #include "font.h"
  29 #include "compose.hpp"
  30 #include "audio_buffers.h"
  31 #include "image.h"
  32 #include <dcp/mono_picture_asset.h>
  33 #include <dcp/stereo_picture_asset.h>
  34 #include <dcp/sound_asset.h>
  35 #include <dcp/sound_asset_writer.h>
  36 #include <dcp/reel.h>
  37 #include <dcp/reel_mono_picture_asset.h>
  38 #include <dcp/reel_stereo_picture_asset.h>
  39 #include <dcp/reel_sound_asset.h>
  40 #include <dcp/reel_subtitle_asset.h>
  41 #include <dcp/reel_closed_caption_asset.h>
  42 #include <dcp/dcp.h>
  43 #include <dcp/cpl.h>
  44 #include <dcp/certificate_chain.h>
  45 #include <dcp/interop_subtitle_asset.h>
  46 #include <dcp/smpte_subtitle_asset.h>
  47 #include <dcp/raw_convert.h>
  48 #include <dcp/subtitle_image.h>
  49 #include <boost/foreach.hpp>
  50
  51 #include "i18n.h"
  52
  53 using std::list;
  54 using std::string;
  55 using std::cout;
  56 using std::map;
  57 using boost::shared_ptr;
  58 using boost::optional;
  59 using boost::dynamic_pointer_cast;
  60 using dcp::Data;
  61 using dcp::raw_convert;
  62
  63 int const ReelWriter::_info_size = 48;
  64
  65 /** @param job Related job, or 0 */
  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         if (job) {
 102                 job->sub (_("Checking existing image data"));
 103         }
 104         _first_nonexistant_frame = check_existing_picture_asset ();
 105
 106         _picture_asset_writer = _picture_asset->start_write (
 107                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(_period),
 108                 _first_nonexistant_frame > 0
 109                 );
 110
 111         if (_film->audio_channels ()) {
 112                 _sound_asset.reset (
 113                         new dcp::SoundAsset (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels (), standard)
 114                         );
 115
 116                 if (_film->encrypted ()) {
 117                         _sound_asset->set_key (_film->key ());
 118                 }
 119
 120                 DCPOMATIC_ASSERT (_film->directory());
 121
 122                 /* Write the sound asset into the film directory so that we leave the creation
 123                    of the DCP directory until the last minute.
 124                 */
 125                 _sound_asset_writer = _sound_asset->start_write (
 126                         _film->directory().get() / audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary)
 127                         );
 128         }
 129 }
 130
 131 /** @param frame reel-relative frame */
 132 void
 133 ReelWriter::write_frame_info (Frame frame, Eyes eyes, dcp::FrameInfo info) const
 134 {
 135         shared_ptr<InfoFileHandle> handle = _film->info_file_handle(_period, false);
 136         dcpomatic_fseek (handle->get(), frame_info_position(frame, eyes), SEEK_SET);
 137         checked_fwrite (&info.offset, sizeof(info.offset), handle->get(), handle->file());
 138         checked_fwrite (&info.size, sizeof (info.size), handle->get(), handle->file());
 139         checked_fwrite (info.hash.c_str(), info.hash.size(), handle->get(), handle->file());
 140 }
 141
 142 dcp::FrameInfo
 143 ReelWriter::read_frame_info (shared_ptr<InfoFileHandle> info, Frame frame, Eyes eyes) const
 144 {
 145         dcp::FrameInfo frame_info;
 146         dcpomatic_fseek (info->get(), frame_info_position(frame, eyes), SEEK_SET);
 147         checked_fread (&frame_info.offset, sizeof(frame_info.offset), info->get(), info->file());
 148         checked_fread (&frame_info.size, sizeof(frame_info.size), info->get(), info->file());
 149
 150         char hash_buffer[33];
 151         checked_fread (hash_buffer, 32, info->get(), info->file());
 152         hash_buffer[32] = '\0';
 153         frame_info.hash = hash_buffer;
 154
 155         return frame_info;
 156 }
 157
 158 long
 159 ReelWriter::frame_info_position (Frame frame, Eyes eyes) const
 160 {
 161         switch (eyes) {
 162         case EYES_BOTH:
 163                 return frame * _info_size;
 164         case EYES_LEFT:
 165                 return frame * _info_size * 2;
 166         case EYES_RIGHT:
 167                 return frame * _info_size * 2 + _info_size;
 168         default:
 169                 DCPOMATIC_ASSERT (false);
 170         }
 171
 172         DCPOMATIC_ASSERT (false);
 173 }
 174
 175 Frame
 176 ReelWriter::check_existing_picture_asset ()
 177 {
 178         DCPOMATIC_ASSERT (_picture_asset->file());
 179         boost::filesystem::path asset = _picture_asset->file().get();
 180
 181         /* If there is an existing asset, break any hard links to it as we are about to change its contents
 182            (if only by changing the IDs); see #1126.
 183         */
 184
 185         if (boost::filesystem::exists(asset) && boost::filesystem::hard_link_count(asset) > 1) {
 186                 boost::filesystem::copy_file (asset, asset.string() + ".tmp");
 187                 boost::filesystem::remove (asset);
 188                 boost::filesystem::rename (asset.string() + ".tmp", asset);
 189         }
 190
 191         /* Try to open the existing asset */
 192         FILE* asset_file = fopen_boost (asset, "rb");
 193         if (!asset_file) {
 194                 LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", asset.string(), errno);
 195                 return 0;
 196         } else {
 197                 LOG_GENERAL ("Opened existing asset at %1", asset.string());
 198         }
 199
 200         shared_ptr<InfoFileHandle> info_file;
 201
 202         try {
 203                 info_file = _film->info_file_handle (_period, true);
 204         } catch (OpenFileError) {
 205                 LOG_GENERAL_NC ("Could not open film info file");
 206                 fclose (asset_file);
 207                 return 0;
 208         }
 209
 210         /* Offset of the last dcp::FrameInfo in the info file */
 211         int const n = (boost::filesystem::file_size(info_file->file()) / _info_size) - 1;
 212         LOG_GENERAL ("The last FI is %1; info file is %2, info size %3", n, boost::filesystem::file_size(info_file->file()), _info_size);
 213
 214         Frame first_nonexistant_frame;
 215         if (_film->three_d ()) {
 216                 /* Start looking at the last left frame */
 217                 first_nonexistant_frame = n / 2;
 218         } else {
 219                 first_nonexistant_frame = n;
 220         }
 221
 222         while (!existing_picture_frame_ok(asset_file, info_file, first_nonexistant_frame) && first_nonexistant_frame > 0) {
 223                 --first_nonexistant_frame;
 224         }
 225
 226         if (!_film->three_d() && first_nonexistant_frame > 0) {
 227                 /* If we are doing 3D we might have found a good L frame with no R, so only
 228                    do this if we're in 2D and we've just found a good B(oth) frame.
 229                 */
 230                 ++first_nonexistant_frame;
 231         }
 232
 233         LOG_GENERAL ("Proceeding with first nonexistant frame %1", first_nonexistant_frame);
 234
 235         fclose (asset_file);
 236
 237         return first_nonexistant_frame;
 238 }
 239
 240 void
 241 ReelWriter::write (optional<Data> encoded, Frame frame, Eyes eyes)
 242 {
 243         dcp::FrameInfo fin = _picture_asset_writer->write (encoded->data().get (), encoded->size());
 244         write_frame_info (frame, eyes, fin);
 245         _last_written[eyes] = encoded;
 246         _last_written_video_frame = frame;
 247         _last_written_eyes = eyes;
 248 }
 249
 250 void
 251 ReelWriter::fake_write (Frame frame, Eyes eyes, int size)
 252 {
 253         _picture_asset_writer->fake_write (size);
 254         _last_written_video_frame = frame;
 255         _last_written_eyes = eyes;
 256 }
 257
 258 void
 259 ReelWriter::repeat_write (Frame frame, Eyes eyes)
 260 {
 261         dcp::FrameInfo fin = _picture_asset_writer->write (
 262                 _last_written[eyes]->data().get(),
 263                 _last_written[eyes]->size()
 264                 );
 265         write_frame_info (frame, eyes, fin);
 266         _last_written_video_frame = frame;
 267         _last_written_eyes = eyes;
 268 }
 269
 270 void
 271 ReelWriter::finish ()
 272 {
 273         if (!_picture_asset_writer->finalize ()) {
 274                 /* Nothing was written to the picture asset */
 275                 LOG_GENERAL ("Nothing was written to reel %1 of %2", _reel_index, _reel_count);
 276                 _picture_asset.reset ();
 277         }
 278
 279         if (_sound_asset_writer && !_sound_asset_writer->finalize ()) {
 280                 /* Nothing was written to the sound asset */
 281                 _sound_asset.reset ();
 282         }
 283
 284         /* Hard-link any video asset file into the DCP */
 285         if (_picture_asset) {
 286                 DCPOMATIC_ASSERT (_picture_asset->file());
 287                 boost::filesystem::path video_from = _picture_asset->file().get();
 288                 boost::filesystem::path video_to;
 289                 video_to /= _film->dir (_film->dcp_name());
 290                 video_to /= video_asset_filename (_picture_asset, _reel_index, _reel_count, _content_summary);
 291
 292                 boost::system::error_code ec;
 293                 boost::filesystem::create_hard_link (video_from, video_to, ec);
 294                 if (ec) {
 295                         LOG_WARNING_NC ("Hard-link failed; copying instead");
 296                         boost::filesystem::copy_file (video_from, video_to, ec);
 297                         if (ec) {
 298                                 LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 299                                 throw FileError (ec.message(), video_from);
 300                         }
 301                 }
 302
 303                 _picture_asset->set_file (video_to);
 304         }
 305
 306         /* Move the audio asset into the DCP */
 307         if (_sound_asset) {
 308                 boost::filesystem::path audio_to;
 309                 audio_to /= _film->dir (_film->dcp_name ());
 310                 string const aaf = audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary);
 311                 audio_to /= aaf;
 312
 313                 boost::system::error_code ec;
 314                 boost::filesystem::rename (_film->file (aaf), audio_to, ec);
 315                 if (ec) {
 316                         throw FileError (
 317                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), aaf
 318                                 );
 319                 }
 320
 321                 _sound_asset->set_file (audio_to);
 322         }
 323 }
 324
 325 template <class T>
 326 shared_ptr<T>
 327 maybe_add_text (
 328         shared_ptr<dcp::SubtitleAsset> asset,
 329         int64_t picture_duration,
 330         shared_ptr<dcp::Reel> reel,
 331         list<ReferencedReelAsset> const & refs,
 332         list<shared_ptr<Font> > const & fonts,
 333         shared_ptr<const Film> film,
 334         DCPTimePeriod period
 335         )
 336 {
 337         Frame const period_duration = period.duration().frames_round(film->video_frame_rate());
 338
 339         shared_ptr<T> reel_asset;
 340
 341         if (asset) {
 342                 boost::filesystem::path liberation_normal;
 343                 try {
 344                         liberation_normal = shared_path() / "LiberationSans-Regular.ttf";
 345                         if (!boost::filesystem::exists (liberation_normal)) {
 346                                 /* Hack for unit tests */
 347                                 liberation_normal = shared_path() / "fonts" / "LiberationSans-Regular.ttf";
 348                         }
 349                 } catch (boost::filesystem::filesystem_error& e) {
 350
 351                 }
 352
 353                 if (!boost::filesystem::exists(liberation_normal)) {
 354                         liberation_normal = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf";
 355                 }
 356
 357                 /* Add the font to the subtitle content */
 358                 BOOST_FOREACH (shared_ptr<Font> j, fonts) {
 359                         asset->add_font (j->id(), j->file().get_value_or(liberation_normal));
 360                 }
 361
 362                 if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (asset)) {
 363                         boost::filesystem::path directory = film->dir (film->dcp_name ()) / asset->id ();
 364                         boost::filesystem::create_directories (directory);
 365                         asset->write (directory / ("sub_" + asset->id() + ".xml"));
 366                 } else {
 367                         /* All our assets should be the same length; use the picture asset length here
 368                            as a reference to set the subtitle one.  We'll use the duration rather than
 369                            the intrinsic duration; we don't care if the picture asset has been trimmed, we're
 370                            just interested in its presentation length.
 371                         */
 372                         dynamic_pointer_cast<dcp::SMPTESubtitleAsset>(asset)->set_intrinsic_duration (picture_duration);
 373
 374                         asset->write (
 375                                 film->dir(film->dcp_name()) / ("sub_" + asset->id() + ".mxf")
 376                                 );
 377                 }
 378
 379                 reel_asset.reset (
 380                         new T (
 381                                 asset,
 382                                 dcp::Fraction (film->video_frame_rate(), 1),
 383                                 picture_duration,
 384                                 0
 385                                 )
 386                         );
 387         } else {
 388                 /* We don't have a subtitle asset of our own; hopefully we have one to reference */
 389                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 390                         shared_ptr<T> k = dynamic_pointer_cast<T> (j.asset);
 391                         if (k && j.period == period) {
 392                                 reel_asset = k;
 393                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 394                                 if (k->hash()) {
 395                                         k->asset_ref()->set_hash (k->hash().get());
 396                                 }
 397                         }
 398                 }
 399         }
 400
 401         if (reel_asset) {
 402                 if (reel_asset->duration() != period_duration) {
 403                         throw ProgrammingError (
 404                                 __FILE__, __LINE__,
 405                                 String::compose ("%1 vs %2", reel_asset->duration(), period_duration)
 406                                 );
 407                 }
 408                 reel->add (reel_asset);
 409         }
 410
 411         return reel_asset;
 412 }
 413
 414 shared_ptr<dcp::Reel>
 415 ReelWriter::create_reel (list<ReferencedReelAsset> const & refs, list<shared_ptr<Font> > const & fonts)
 416 {
 417         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 418
 419         shared_ptr<dcp::ReelPictureAsset> reel_picture_asset;
 420
 421         if (_picture_asset) {
 422                 /* We have made a picture asset of our own.  Put it into the reel */
 423                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 424                 if (mono) {
 425                         reel_picture_asset.reset (new dcp::ReelMonoPictureAsset (mono, 0));
 426                 }
 427
 428                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 429                 if (stereo) {
 430                         reel_picture_asset.reset (new dcp::ReelStereoPictureAsset (stereo, 0));
 431                 }
 432         } else {
 433                 LOG_GENERAL ("no picture asset of our own; look through %1", refs.size());
 434                 /* We don't have a picture asset of our own; hopefully we have one to reference */
 435                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 436                         shared_ptr<dcp::ReelPictureAsset> k = dynamic_pointer_cast<dcp::ReelPictureAsset> (j.asset);
 437                         if (k) {
 438                                 LOG_GENERAL ("candidate picture asset period is %1-%2", j.period.from.get(), j.period.to.get());
 439                         }
 440                         if (k && j.period == _period) {
 441                                 reel_picture_asset = k;
 442                         }
 443                 }
 444         }
 445
 446         LOG_GENERAL ("create_reel for %1-%2; %3 of %4", _period.from.get(), _period.to.get(), _reel_index, _reel_count);
 447
 448         Frame const period_duration = _period.duration().frames_round(_film->video_frame_rate());
 449
 450         DCPOMATIC_ASSERT (reel_picture_asset);
 451         if (reel_picture_asset->duration() != period_duration) {
 452                 throw ProgrammingError (
 453                         __FILE__, __LINE__,
 454                         String::compose ("%1 vs %2", reel_picture_asset->duration(), period_duration)
 455                         );
 456         }
 457         reel->add (reel_picture_asset);
 458
 459         /* If we have a hash for this asset in the CPL, assume that it is correct */
 460         if (reel_picture_asset->hash()) {
 461                 reel_picture_asset->asset_ref()->set_hash (reel_picture_asset->hash().get());
 462         }
 463
 464         shared_ptr<dcp::ReelSoundAsset> reel_sound_asset;
 465
 466         if (_sound_asset) {
 467                 /* We have made a sound asset of our own.  Put it into the reel */
 468                 reel_sound_asset.reset (new dcp::ReelSoundAsset (_sound_asset, 0));
 469         } else {
 470                 /* We don't have a sound asset of our own; hopefully we have one to reference */
 471                 BOOST_FOREACH (ReferencedReelAsset j, refs) {
 472                         shared_ptr<dcp::ReelSoundAsset> k = dynamic_pointer_cast<dcp::ReelSoundAsset> (j.asset);
 473                         if (k && j.period == _period) {
 474                                 reel_sound_asset = k;
 475                                 /* If we have a hash for this asset in the CPL, assume that it is correct */
 476                                 if (k->hash()) {
 477                                         k->asset_ref()->set_hash (k->hash().get());
 478                                 }
 479                         }
 480                 }
 481         }
 482
 483         DCPOMATIC_ASSERT (reel_sound_asset);
 484         if (reel_sound_asset->duration() != period_duration) {
 485                 LOG_ERROR (
 486                         "Reel sound asset has length %1 but reel period is %2",
 487                         reel_sound_asset->duration(),
 488                         period_duration
 489                         );
 490                 if (reel_sound_asset->duration() != period_duration) {
 491                         throw ProgrammingError (
 492                                 __FILE__, __LINE__,
 493                                 String::compose ("%1 vs %2", reel_sound_asset->duration(), period_duration)
 494                                 );
 495                 }
 496
 497         }
 498         reel->add (reel_sound_asset);
 499
 500         maybe_add_text<dcp::ReelSubtitleAsset> (_subtitle_asset, reel_picture_asset->duration(), reel, refs, fonts, _film, _period);
 501         for (map<DCPTextTrack, shared_ptr<dcp::SubtitleAsset> >::const_iterator i = _closed_caption_assets.begin(); i != _closed_caption_assets.end(); ++i) {
 502                 shared_ptr<dcp::ReelClosedCaptionAsset> a = maybe_add_text<dcp::ReelClosedCaptionAsset> (
 503                         i->second, reel_picture_asset->duration(), reel, refs, fonts, _film, _period
 504                         );
 505                 a->set_annotation_text (i->first.name);
 506                 a->set_language (i->first.language);
 507         }
 508
 509         return reel;
 510 }
 511
 512 void
 513 ReelWriter::calculate_digests (boost::function<void (float)> set_progress)
 514 {
 515         if (_picture_asset) {
 516                 _picture_asset->hash (set_progress);
 517         }
 518
 519         if (_sound_asset) {
 520                 _sound_asset->hash (set_progress);
 521         }
 522 }
 523
 524 Frame
 525 ReelWriter::start () const
 526 {
 527         return _period.from.frames_floor (_film->video_frame_rate());
 528 }
 529
 530
 531 void
 532 ReelWriter::write (shared_ptr<const AudioBuffers> audio)
 533 {
 534         if (!_sound_asset_writer) {
 535                 return;
 536         }
 537
 538         DCPOMATIC_ASSERT (audio);
 539         _sound_asset_writer->write (audio->data(), audio->frames());
 540 }
 541
 542 void
 543 ReelWriter::write (PlayerText subs, TextType type, optional<DCPTextTrack> track, DCPTimePeriod period)
 544 {
 545         shared_ptr<dcp::SubtitleAsset> asset;
 546
 547         switch (type) {
 548         case TEXT_OPEN_SUBTITLE:
 549                 asset = _subtitle_asset;
 550                 break;
 551         case TEXT_CLOSED_CAPTION:
 552                 DCPOMATIC_ASSERT (track);
 553                 asset = _closed_caption_assets[*track];
 554                 break;
 555         default:
 556                 DCPOMATIC_ASSERT (false);
 557         }
 558
 559         if (!asset) {
 560                 string lang = _film->subtitle_language ();
 561                 if (_film->interop ()) {
 562                         shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
 563                         s->set_movie_title (_film->name ());
 564                         if (type == TEXT_OPEN_SUBTITLE) {
 565                                 s->set_language (lang.empty() ? "Unknown" : lang);
 566                         } else {
 567                                 s->set_language (track->language);
 568                         }
 569                         s->set_reel_number (raw_convert<string> (_reel_index + 1));
 570                         asset = s;
 571                 } else {
 572                         shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
 573                         s->set_content_title_text (_film->name ());
 574                         if (type == TEXT_OPEN_SUBTITLE && !lang.empty()) {
 575                                 s->set_language (lang);
 576                         } else {
 577                                 s->set_language (track->language);
 578                         }
 579                         s->set_edit_rate (dcp::Fraction (_film->video_frame_rate (), 1));
 580                         s->set_reel_number (_reel_index + 1);
 581                         s->set_time_code_rate (_film->video_frame_rate ());
 582                         s->set_start_time (dcp::Time ());
 583                         if (_film->encrypted ()) {
 584                                 s->set_key (_film->key ());
 585                         }
 586                         asset = s;
 587                 }
 588         }
 589
 590         switch (type) {
 591         case TEXT_OPEN_SUBTITLE:
 592                 _subtitle_asset = asset;
 593                 break;
 594         case TEXT_CLOSED_CAPTION:
 595                 DCPOMATIC_ASSERT (track);
 596                 _closed_caption_assets[*track] = asset;
 597                 break;
 598         default:
 599                 DCPOMATIC_ASSERT (false);
 600         }
 601
 602         BOOST_FOREACH (StringText i, subs.string) {
 603                 /* XXX: couldn't / shouldn't we use period here rather than getting time from the subtitle? */
 604                 i.set_in  (i.in()  - dcp::Time (_period.from.seconds(), i.in().tcr));
 605                 i.set_out (i.out() - dcp::Time (_period.from.seconds(), i.out().tcr));
 606                 asset->add (shared_ptr<dcp::Subtitle>(new dcp::SubtitleString(i)));
 607         }
 608
 609         BOOST_FOREACH (BitmapText i, subs.bitmap) {
 610                 asset->add (
 611                         shared_ptr<dcp::Subtitle>(
 612                                 new dcp::SubtitleImage(
 613                                         i.image->as_png(),
 614                                         dcp::Time(period.from.seconds() - _period.from.seconds(), _film->video_frame_rate()),
 615                                         dcp::Time(period.to.seconds() - _period.from.seconds(), _film->video_frame_rate()),
 616                                         i.rectangle.x, dcp::HALIGN_LEFT, i.rectangle.y, dcp::VALIGN_TOP,
 617                                         dcp::Time(), dcp::Time()
 618                                         )
 619                                 )
 620                         );
 621         }
 622 }
 623
 624 bool
 625 ReelWriter::existing_picture_frame_ok (FILE* asset_file, shared_ptr<InfoFileHandle> info_file, Frame frame) const
 626 {
 627         LOG_GENERAL ("Checking existing picture frame %1", frame);
 628
 629         /* Read the data from the info file; for 3D we just check the left
 630            frames until we find a good one.
 631         */
 632         dcp::FrameInfo const info = read_frame_info (info_file, frame, _film->three_d () ? EYES_LEFT : EYES_BOTH);
 633
 634         bool ok = true;
 635
 636         /* Read the data from the asset and hash it */
 637         dcpomatic_fseek (asset_file, info.offset, SEEK_SET);
 638         Data data (info.size);
 639         size_t const read = fread (data.data().get(), 1, data.size(), asset_file);
 640         LOG_GENERAL ("Read %1 bytes of asset data; wanted %2", read, info.size);
 641         if (read != static_cast<size_t> (data.size ())) {
 642                 LOG_GENERAL ("Existing frame %1 is incomplete", frame);
 643                 ok = false;
 644         } else {
 645                 Digester digester;
 646                 digester.add (data.data().get(), data.size());
 647                 LOG_GENERAL ("Hash %1 vs %2", digester.get(), info.hash);
 648                 if (digester.get() != info.hash) {
 649                         LOG_GENERAL ("Existing frame %1 failed hash check", frame);
 650                         ok = false;
 651                 }
 652         }
 653
 654         return ok;
 655 }