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