src/lib/writer.cc

   1 /*
   2     Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include "writer.h"
  21 #include "compose.hpp"
  22 #include "film.h"
  23 #include "ratio.h"
  24 #include "log.h"
  25 #include "dcp_video.h"
  26 #include "dcp_content_type.h"
  27 #include "audio_mapping.h"
  28 #include "config.h"
  29 #include "job.h"
  30 #include "cross.h"
  31 #include "audio_buffers.h"
  32 #include "md5_digester.h"
  33 #include "data.h"
  34 #include "version.h"
  35 #include "font.h"
  36 #include "util.h"
  37 #include <dcp/mono_picture_asset.h>
  38 #include <dcp/stereo_picture_asset.h>
  39 #include <dcp/sound_asset.h>
  40 #include <dcp/sound_asset_writer.h>
  41 #include <dcp/reel.h>
  42 #include <dcp/reel_mono_picture_asset.h>
  43 #include <dcp/reel_stereo_picture_asset.h>
  44 #include <dcp/reel_sound_asset.h>
  45 #include <dcp/reel_subtitle_asset.h>
  46 #include <dcp/dcp.h>
  47 #include <dcp/cpl.h>
  48 #include <dcp/signer.h>
  49 #include <dcp/interop_subtitle_asset.h>
  50 #include <dcp/smpte_subtitle_asset.h>
  51 #include <boost/foreach.hpp>
  52 #include <fstream>
  53 #include <cerrno>
  54
  55 #include "i18n.h"
  56
  57 #define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
  58 #define LOG_TIMING(...) _film->log()->microsecond_log (String::compose (__VA_ARGS__), Log::TYPE_TIMING);
  59 #define LOG_WARNING_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_WARNING);
  60 #define LOG_WARNING(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_WARNING);
  61 #define LOG_ERROR(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_ERROR);
  62
  63 /* OS X strikes again */
  64 #undef set_key
  65
  66 using std::make_pair;
  67 using std::pair;
  68 using std::string;
  69 using std::list;
  70 using std::cout;
  71 using boost::shared_ptr;
  72 using boost::weak_ptr;
  73 using boost::dynamic_pointer_cast;
  74
  75 Writer::Writer (shared_ptr<const Film> film, weak_ptr<Job> j)
  76         : _film (film)
  77         , _job (j)
  78         , _first_nonexistant_frame (0)
  79         , _thread (0)
  80         , _finish (false)
  81         , _queued_full_in_memory (0)
  82         , _last_written_frame (-1)
  83         , _last_written_eyes (EYES_RIGHT)
  84         , _maximum_frames_in_memory (0)
  85         , _full_written (0)
  86         , _fake_written (0)
  87         , _repeat_written (0)
  88         , _pushed_to_disk (0)
  89 {
  90         /* Remove any old DCP */
  91         boost::filesystem::remove_all (_film->dir (_film->dcp_name ()));
  92
  93         shared_ptr<Job> job = _job.lock ();
  94         DCPOMATIC_ASSERT (job);
  95
  96         /* Create our picture asset in a subdirectory, named according to those
  97            film's parameters which affect the video output.  We will hard-link
  98            it into the DCP later.
  99         */
 100
 101         if (_film->three_d ()) {
 102                 _picture_asset.reset (new dcp::StereoPictureAsset (dcp::Fraction (_film->video_frame_rate (), 1)));
 103         } else {
 104                 _picture_asset.reset (new dcp::MonoPictureAsset (dcp::Fraction (_film->video_frame_rate (), 1)));
 105         }
 106
 107         _picture_asset->set_size (_film->frame_size ());
 108
 109         if (_film->encrypted ()) {
 110                 _picture_asset->set_key (_film->key ());
 111         }
 112
 113         _picture_asset->set_file (
 114                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename()
 115                 );
 116
 117         job->sub (_("Checking existing image data"));
 118         check_existing_picture_asset ();
 119
 120         _picture_asset_writer = _picture_asset->start_write (
 121                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(),
 122                 _film->interop() ? dcp::INTEROP : dcp::SMPTE,
 123                 _first_nonexistant_frame > 0
 124                 );
 125
 126         if (_film->audio_channels ()) {
 127                 _sound_asset.reset (
 128                         new dcp::SoundAsset (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels ())
 129                         );
 130
 131                 if (_film->encrypted ()) {
 132                         _sound_asset->set_key (_film->key ());
 133                 }
 134
 135                 /* Write the sound asset into the film directory so that we leave the creation
 136                    of the DCP directory until the last minute.
 137                 */
 138                 _sound_asset_writer = _sound_asset->start_write (
 139                         _film->directory() / audio_asset_filename (_sound_asset),
 140                         _film->interop() ? dcp::INTEROP : dcp::SMPTE
 141                         );
 142         }
 143
 144         /* Check that the signer is OK if we need one */
 145         if (_film->is_signed() && !Config::instance()->signer()->valid ()) {
 146                 throw InvalidSignerError ();
 147         }
 148
 149         _thread = new boost::thread (boost::bind (&Writer::thread, this));
 150
 151         job->sub (_("Encoding image data"));
 152 }
 153
 154 Writer::~Writer ()
 155 {
 156         terminate_thread (false);
 157 }
 158
 159 void
 160 Writer::write (Data encoded, int frame, Eyes eyes)
 161 {
 162         boost::mutex::scoped_lock lock (_mutex);
 163
 164         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 165                 /* The queue is too big; wait until that is sorted out */
 166                 _full_condition.wait (lock);
 167         }
 168
 169         QueueItem qi;
 170         qi.type = QueueItem::FULL;
 171         qi.encoded = encoded;
 172         qi.frame = frame;
 173
 174         if (_film->three_d() && eyes == EYES_BOTH) {
 175                 /* 2D material in a 3D DCP; fake the 3D */
 176                 qi.eyes = EYES_LEFT;
 177                 _queue.push_back (qi);
 178                 ++_queued_full_in_memory;
 179                 qi.eyes = EYES_RIGHT;
 180                 _queue.push_back (qi);
 181                 ++_queued_full_in_memory;
 182         } else {
 183                 qi.eyes = eyes;
 184                 _queue.push_back (qi);
 185                 ++_queued_full_in_memory;
 186         }
 187
 188         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 189         _empty_condition.notify_all ();
 190 }
 191
 192 void
 193 Writer::repeat (int frame, Eyes eyes)
 194 {
 195         boost::mutex::scoped_lock lock (_mutex);
 196
 197         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 198                 /* The queue is too big; wait until that is sorted out */
 199                 _full_condition.wait (lock);
 200         }
 201
 202         QueueItem qi;
 203         qi.type = QueueItem::REPEAT;
 204         qi.frame = frame;
 205         if (_film->three_d() && eyes == EYES_BOTH) {
 206                 qi.eyes = EYES_LEFT;
 207                 _queue.push_back (qi);
 208                 qi.eyes = EYES_RIGHT;
 209                 _queue.push_back (qi);
 210         } else {
 211                 qi.eyes = eyes;
 212                 _queue.push_back (qi);
 213         }
 214
 215         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 216         _empty_condition.notify_all ();
 217 }
 218
 219 void
 220 Writer::fake_write (int frame, Eyes eyes)
 221 {
 222         boost::mutex::scoped_lock lock (_mutex);
 223
 224         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 225                 /* The queue is too big; wait until that is sorted out */
 226                 _full_condition.wait (lock);
 227         }
 228
 229         FILE* file = fopen_boost (_film->info_file (), "rb");
 230         if (!file) {
 231                 throw ReadFileError (_film->info_file ());
 232         }
 233         dcp::FrameInfo info = read_frame_info (file, frame, eyes);
 234         fclose (file);
 235
 236         QueueItem qi;
 237         qi.type = QueueItem::FAKE;
 238         qi.size = info.size;
 239         qi.frame = frame;
 240         if (_film->three_d() && eyes == EYES_BOTH) {
 241                 qi.eyes = EYES_LEFT;
 242                 _queue.push_back (qi);
 243                 qi.eyes = EYES_RIGHT;
 244                 _queue.push_back (qi);
 245         } else {
 246                 qi.eyes = eyes;
 247                 _queue.push_back (qi);
 248         }
 249
 250         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 251         _empty_condition.notify_all ();
 252 }
 253
 254 /** This method is not thread safe */
 255 void
 256 Writer::write (shared_ptr<const AudioBuffers> audio)
 257 {
 258         if (_sound_asset_writer) {
 259                 _sound_asset_writer->write (audio->data(), audio->frames());
 260         }
 261 }
 262
 263 /** This must be called from Writer::thread() with an appropriate lock held */
 264 bool
 265 Writer::have_sequenced_image_at_queue_head ()
 266 {
 267         if (_queue.empty ()) {
 268                 return false;
 269         }
 270
 271         _queue.sort ();
 272
 273         /* The queue should contain only EYES_LEFT/EYES_RIGHT pairs or EYES_BOTH */
 274
 275         if (_queue.front().eyes == EYES_BOTH) {
 276                 /* 2D */
 277                 return _queue.front().frame == (_last_written_frame + 1);
 278         }
 279
 280         /* 3D */
 281
 282         if (_last_written_eyes == EYES_LEFT && _queue.front().frame == _last_written_frame && _queue.front().eyes == EYES_RIGHT) {
 283                 return true;
 284         }
 285
 286         if (_last_written_eyes == EYES_RIGHT && _queue.front().frame == (_last_written_frame + 1) && _queue.front().eyes == EYES_LEFT) {
 287                 return true;
 288         }
 289
 290         return false;
 291 }
 292
 293 void
 294 Writer::write_frame_info (int frame, Eyes eyes, dcp::FrameInfo info) const
 295 {
 296         FILE* file = fopen_boost (_film->info_file(), "ab");
 297         if (!file) {
 298                 throw OpenFileError (_film->info_file ());
 299         }
 300         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 301         fwrite (&info.offset, sizeof (info.offset), 1, file);
 302         fwrite (&info.size, sizeof (info.size), 1, file);
 303         fwrite (info.hash.c_str(), 1, info.hash.size(), file);
 304         fclose (file);
 305 }
 306
 307 void
 308 Writer::thread ()
 309 try
 310 {
 311         while (true)
 312         {
 313                 boost::mutex::scoped_lock lock (_mutex);
 314
 315                 while (true) {
 316
 317                         if (_finish || _queued_full_in_memory > _maximum_frames_in_memory || have_sequenced_image_at_queue_head ()) {
 318                                 /* We've got something to do: go and do it */
 319                                 break;
 320                         }
 321
 322                         /* Nothing to do: wait until something happens which may indicate that we do */
 323                         LOG_TIMING (N_("writer sleeps with a queue of %1"), _queue.size());
 324                         _empty_condition.wait (lock);
 325                         LOG_TIMING (N_("writer wakes with a queue of %1"), _queue.size());
 326                 }
 327
 328                 if (_finish && _queue.empty()) {
 329                         return;
 330                 }
 331
 332                 /* We stop here if we have been asked to finish, and if either the queue
 333                    is empty or we do not have a sequenced image at its head (if this is the
 334                    case we will never terminate as no new frames will be sent once
 335                    _finish is true).
 336                 */
 337                 if (_finish && (!have_sequenced_image_at_queue_head() || _queue.empty())) {
 338                         /* (Hopefully temporarily) log anything that was not written */
 339                         if (!_queue.empty() && !have_sequenced_image_at_queue_head()) {
 340                                 LOG_WARNING (N_("Finishing writer with a left-over queue of %1:"), _queue.size());
 341                                 for (list<QueueItem>::const_iterator i = _queue.begin(); i != _queue.end(); ++i) {
 342                                         if (i->type == QueueItem::FULL) {
 343                                                 LOG_WARNING (N_("- type FULL, frame %1, eyes %2"), i->frame, i->eyes);
 344                                         } else {
 345                                                 LOG_WARNING (N_("- type FAKE, size %1, frame %2, eyes %3"), i->size, i->frame, i->eyes);
 346                                         }
 347                                 }
 348                                 LOG_WARNING (N_("Last written frame %1, last written eyes %2"), _last_written_frame, _last_written_eyes);
 349                         }
 350                         return;
 351                 }
 352                 /* Write any frames that we can write; i.e. those that are in sequence. */
 353                 while (have_sequenced_image_at_queue_head ()) {
 354                         QueueItem qi = _queue.front ();
 355                         _queue.pop_front ();
 356                         if (qi.type == QueueItem::FULL && qi.encoded) {
 357                                 --_queued_full_in_memory;
 358                         }
 359
 360                         lock.unlock ();
 361                         switch (qi.type) {
 362                         case QueueItem::FULL:
 363                         {
 364                                 LOG_GENERAL (N_("Writer FULL-writes %1 (%2)"), qi.frame, qi.eyes);
 365                                 if (!qi.encoded) {
 366                                         qi.encoded = Data (_film->j2c_path (qi.frame, qi.eyes, false));
 367                                 }
 368
 369                                 dcp::FrameInfo fin = _picture_asset_writer->write (qi.encoded->data().get (), qi.encoded->size());
 370                                 write_frame_info (qi.frame, qi.eyes, fin);
 371                                 _last_written[qi.eyes] = qi.encoded;
 372                                 ++_full_written;
 373                                 break;
 374                         }
 375                         case QueueItem::FAKE:
 376                                 LOG_GENERAL (N_("Writer FAKE-writes %1"), qi.frame);
 377                                 _picture_asset_writer->fake_write (qi.size);
 378                                 _last_written[qi.eyes].reset ();
 379                                 ++_fake_written;
 380                                 break;
 381                         case QueueItem::REPEAT:
 382                                 LOG_GENERAL (N_("Writer REPEAT-writes %1"), qi.frame);
 383                                 dcp::FrameInfo fin = _picture_asset_writer->write (
 384                                         _last_written[qi.eyes]->data().get(),
 385                                         _last_written[qi.eyes]->size()
 386                                         );
 387                                 write_frame_info (qi.frame, qi.eyes, fin);
 388                                 ++_repeat_written;
 389                                 break;
 390                         }
 391                         lock.lock ();
 392
 393                         _last_written_frame = qi.frame;
 394                         _last_written_eyes = qi.eyes;
 395
 396                         shared_ptr<Job> job = _job.lock ();
 397                         DCPOMATIC_ASSERT (job);
 398                         int64_t total = _film->length().frames (_film->video_frame_rate ());
 399                         if (_film->three_d ()) {
 400                                 /* _full_written and so on are incremented for each eye, so we need to double the total
 401                                    frames to get the correct progress.
 402                                 */
 403                                 total *= 2;
 404                         }
 405                         if (total) {
 406                                 job->set_progress (float (_full_written + _fake_written) / total);
 407                         }
 408                 }
 409
 410                 while (_queued_full_in_memory > _maximum_frames_in_memory) {
 411                         /* Too many frames in memory which can't yet be written to the stream.
 412                            Write some FULL frames to disk.
 413                         */
 414
 415                         /* Find one from the back of the queue */
 416                         _queue.sort ();
 417                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 418                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 419                                 ++i;
 420                         }
 421
 422                         DCPOMATIC_ASSERT (i != _queue.rend());
 423                         ++_pushed_to_disk;
 424                         lock.unlock ();
 425
 426                         /* i is valid here, even though we don't hold a lock on the mutex,
 427                            since list iterators are unaffected by insertion and only this
 428                            thread could erase the last item in the list.
 429                         */
 430
 431                         LOG_GENERAL (
 432                                 "Writer full (awaiting %1 [last eye was %2]); pushes %3 to disk",
 433                                 _last_written_frame + 1,
 434                                 _last_written_eyes, i->frame
 435                                 );
 436
 437                         i->encoded->write_via_temp (_film->j2c_path (i->frame, i->eyes, true), _film->j2c_path (i->frame, i->eyes, false));
 438
 439                         lock.lock ();
 440                         i->encoded.reset ();
 441                         --_queued_full_in_memory;
 442                 }
 443
 444                 /* The queue has probably just gone down a bit; notify anything wait()ing on _full_condition */
 445                 _full_condition.notify_all ();
 446         }
 447 }
 448 catch (...)
 449 {
 450         store_current ();
 451 }
 452
 453 void
 454 Writer::terminate_thread (bool can_throw)
 455 {
 456         boost::mutex::scoped_lock lock (_mutex);
 457         if (_thread == 0) {
 458                 return;
 459         }
 460
 461         _finish = true;
 462         _empty_condition.notify_all ();
 463         _full_condition.notify_all ();
 464         lock.unlock ();
 465
 466         _thread->join ();
 467         if (can_throw) {
 468                 rethrow ();
 469         }
 470
 471         delete _thread;
 472         _thread = 0;
 473 }
 474
 475 void
 476 Writer::finish ()
 477 {
 478         if (!_thread) {
 479                 return;
 480         }
 481
 482         terminate_thread (true);
 483
 484         _picture_asset_writer->finalize ();
 485         if (_sound_asset_writer) {
 486                 _sound_asset_writer->finalize ();
 487         }
 488
 489         /* Hard-link the video asset into the DCP */
 490         boost::filesystem::path video_from = _picture_asset->file ();
 491
 492         boost::filesystem::path video_to;
 493         video_to /= _film->dir (_film->dcp_name());
 494         video_to /= video_asset_filename (_picture_asset);
 495
 496         boost::system::error_code ec;
 497         boost::filesystem::create_hard_link (video_from, video_to, ec);
 498         if (ec) {
 499                 LOG_WARNING_NC ("Hard-link failed; copying instead");
 500                 boost::filesystem::copy_file (video_from, video_to, ec);
 501                 if (ec) {
 502                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 503                         throw FileError (ec.message(), video_from);
 504                 }
 505         }
 506
 507         _picture_asset->set_file (video_to);
 508
 509         /* Move the audio asset into the DCP */
 510
 511         if (_sound_asset) {
 512                 boost::filesystem::path audio_to;
 513                 audio_to /= _film->dir (_film->dcp_name ());
 514                 audio_to /= audio_asset_filename (_sound_asset);
 515
 516                 boost::filesystem::rename (_film->file (audio_asset_filename (_sound_asset)), audio_to, ec);
 517                 if (ec) {
 518                         throw FileError (
 519                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), audio_asset_filename (_sound_asset)
 520                                 );
 521                 }
 522
 523                 _sound_asset->set_file (audio_to);
 524         }
 525
 526         dcp::DCP dcp (_film->dir (_film->dcp_name()));
 527
 528         shared_ptr<dcp::CPL> cpl (
 529                 new dcp::CPL (
 530                         _film->dcp_name(),
 531                         _film->dcp_content_type()->libdcp_kind ()
 532                         )
 533                 );
 534
 535         dcp.add (cpl);
 536
 537         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 538
 539         shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 540         if (mono) {
 541                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelMonoPictureAsset (mono, 0)));
 542         }
 543
 544         shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 545         if (stereo) {
 546                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelStereoPictureAsset (stereo, 0)));
 547         }
 548
 549         if (_sound_asset) {
 550                 reel->add (shared_ptr<dcp::ReelSoundAsset> (new dcp::ReelSoundAsset (_sound_asset, 0)));
 551         }
 552
 553         if (_subtitle_asset) {
 554                 boost::filesystem::path const liberation = shared_path () / "LiberationSans-Regular.ttf";
 555
 556                 /* Add all the fonts to the subtitle content */
 557                 BOOST_FOREACH (shared_ptr<Font> i, _fonts) {
 558                         _subtitle_asset->add_font (i->id(), i->file().get_value_or (liberation));
 559                 }
 560
 561                 if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (_subtitle_asset)) {
 562                         boost::filesystem::path directory = _film->dir (_film->dcp_name ()) / _subtitle_asset->id ();
 563                         boost::filesystem::create_directories (directory);
 564                         _subtitle_asset->write (directory / ("sub_" + _subtitle_asset->id() + ".xml"));
 565                 } else {
 566                         _subtitle_asset->write (
 567                                 _film->dir (_film->dcp_name ()) / ("sub_" + _subtitle_asset->id() + ".mxf")
 568                                 );
 569                 }
 570
 571                 reel->add (shared_ptr<dcp::ReelSubtitleAsset> (
 572                                    new dcp::ReelSubtitleAsset (
 573                                            _subtitle_asset,
 574                                            dcp::Fraction (_film->video_frame_rate(), 1),
 575                                            _picture_asset->intrinsic_duration (),
 576                                            0
 577                                            )
 578                                    ));
 579         }
 580
 581         cpl->add (reel);
 582
 583         shared_ptr<Job> job = _job.lock ();
 584         DCPOMATIC_ASSERT (job);
 585
 586         job->sub (_("Computing image digest"));
 587         _picture_asset->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 588
 589         if (_sound_asset) {
 590                 job->sub (_("Computing audio digest"));
 591                 _sound_asset->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 592         }
 593
 594         dcp::XMLMetadata meta;
 595         meta.issuer = Config::instance()->dcp_issuer ();
 596         meta.creator = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 597         meta.set_issue_date_now ();
 598
 599         shared_ptr<const dcp::Signer> signer;
 600         if (_film->is_signed ()) {
 601                 signer = Config::instance()->signer ();
 602                 /* We did check earlier, but check again here to be on the safe side */
 603                 if (!signer->valid ()) {
 604                         throw InvalidSignerError ();
 605                 }
 606         }
 607
 608         dcp.write_xml (_film->interop () ? dcp::INTEROP : dcp::SMPTE, meta, signer);
 609
 610         LOG_GENERAL (
 611                 N_("Wrote %1 FULL, %2 FAKE, %3 REPEAT, %4 pushed to disk"), _full_written, _fake_written, _repeat_written, _pushed_to_disk
 612                 );
 613 }
 614
 615 bool
 616 Writer::check_existing_picture_asset_frame (FILE* asset, int f, Eyes eyes)
 617 {
 618         /* Read the frame info as written */
 619         FILE* file = fopen_boost (_film->info_file (), "rb");
 620         if (!file) {
 621                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 622                 return false;
 623         }
 624
 625         dcp::FrameInfo info = read_frame_info (file, f, eyes);
 626         fclose (file);
 627         if (info.size == 0) {
 628                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 629                 return false;
 630         }
 631
 632         /* Read the data from the asset and hash it */
 633         dcpomatic_fseek (asset, info.offset, SEEK_SET);
 634         Data data (info.size);
 635         size_t const read = fread (data.data().get(), 1, data.size(), asset);
 636         if (read != static_cast<size_t> (data.size ())) {
 637                 LOG_GENERAL ("Existing frame %1 is incomplete", f);
 638                 return false;
 639         }
 640
 641         MD5Digester digester;
 642         digester.add (data.data().get(), data.size());
 643         if (digester.get() != info.hash) {
 644                 LOG_GENERAL ("Existing frame %1 failed hash check", f);
 645                 return false;
 646         }
 647
 648         return true;
 649 }
 650
 651 void
 652 Writer::check_existing_picture_asset ()
 653 {
 654         /* Try to open the existing asset */
 655         FILE* asset = fopen_boost (_picture_asset->file(), "rb");
 656         if (!asset) {
 657                 LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", _picture_asset->file().string(), errno);
 658                 return;
 659         }
 660
 661         while (true) {
 662
 663                 shared_ptr<Job> job = _job.lock ();
 664                 DCPOMATIC_ASSERT (job);
 665
 666                 job->set_progress_unknown ();
 667
 668                 if (_film->three_d ()) {
 669                         if (!check_existing_picture_asset_frame (asset, _first_nonexistant_frame, EYES_LEFT)) {
 670                                 break;
 671                         }
 672                         if (!check_existing_picture_asset_frame (asset, _first_nonexistant_frame, EYES_RIGHT)) {
 673                                 break;
 674                         }
 675                 } else {
 676                         if (!check_existing_picture_asset_frame (asset, _first_nonexistant_frame, EYES_BOTH)) {
 677                                 break;
 678                         }
 679                 }
 680
 681                 LOG_GENERAL ("Have existing frame %1", _first_nonexistant_frame);
 682                 ++_first_nonexistant_frame;
 683         }
 684
 685         fclose (asset);
 686 }
 687
 688 /** @param frame Frame index.
 689  *  @return true if we can fake-write this frame.
 690  */
 691 bool
 692 Writer::can_fake_write (int frame) const
 693 {
 694         /* We have to do a proper write of the first frame so that we can set up the JPEG2000
 695            parameters in the asset writer.
 696         */
 697         return (frame != 0 && frame < _first_nonexistant_frame);
 698 }
 699
 700 void
 701 Writer::write (PlayerSubtitles subs)
 702 {
 703         if (subs.text.empty ()) {
 704                 return;
 705         }
 706
 707         if (!_subtitle_asset) {
 708                 string lang = _film->subtitle_language ();
 709                 if (lang.empty ()) {
 710                         lang = "Unknown";
 711                 }
 712                 if (_film->interop ()) {
 713                         shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
 714                         s->set_movie_title (_film->name ());
 715                         s->set_language (lang);
 716                         s->set_reel_number ("1");
 717                         _subtitle_asset = s;
 718                 } else {
 719                         shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
 720                         s->set_content_title_text (_film->name ());
 721                         s->set_language (lang);
 722                         s->set_edit_rate (dcp::Fraction (_film->video_frame_rate (), 1));
 723                         s->set_time_code_rate (_film->video_frame_rate ());
 724                         _subtitle_asset = s;
 725                 }
 726         }
 727
 728         for (list<dcp::SubtitleString>::const_iterator i = subs.text.begin(); i != subs.text.end(); ++i) {
 729                 _subtitle_asset->add (*i);
 730         }
 731 }
 732
 733 void
 734 Writer::write (list<shared_ptr<Font> > fonts)
 735 {
 736         /* Just keep a list of fonts and we'll deal with them in ::finish */
 737         copy (fonts.begin (), fonts.end (), back_inserter (_fonts));
 738 }
 739
 740 bool
 741 operator< (QueueItem const & a, QueueItem const & b)
 742 {
 743         if (a.frame != b.frame) {
 744                 return a.frame < b.frame;
 745         }
 746
 747         return static_cast<int> (a.eyes) < static_cast<int> (b.eyes);
 748 }
 749
 750 bool
 751 operator== (QueueItem const & a, QueueItem const & b)
 752 {
 753         return a.frame == b.frame && a.eyes == b.eyes;
 754 }
 755
 756 void
 757 Writer::set_encoder_threads (int threads)
 758 {
 759         _maximum_frames_in_memory = rint (threads * 1.1);
 760 }
 761
 762 long
 763 Writer::frame_info_position (int frame, Eyes eyes) const
 764 {
 765         static int const info_size = 48;
 766
 767         switch (eyes) {
 768         case EYES_BOTH:
 769                 return frame * info_size;
 770         case EYES_LEFT:
 771                 return frame * info_size * 2;
 772         case EYES_RIGHT:
 773                 return frame * info_size * 2 + info_size;
 774         default:
 775                 DCPOMATIC_ASSERT (false);
 776         }
 777
 778
 779         DCPOMATIC_ASSERT (false);
 780 }
 781
 782 dcp::FrameInfo
 783 Writer::read_frame_info (FILE* file, int frame, Eyes eyes) const
 784 {
 785         dcp::FrameInfo info;
 786         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 787         fread (&info.offset, sizeof (info.offset), 1, file);
 788         fread (&info.size, sizeof (info.size), 1, file);
 789
 790         char hash_buffer[33];
 791         fread (hash_buffer, 1, 32, file);
 792         hash_buffer[32] = '\0';
 793         info.hash = hash_buffer;
 794
 795         return info;
 796 }