src/lib/writer.cc

   1 /*
   2     Copyright (C) 2012-2014 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 "encoded_data.h"
  34 #include "version.h"
  35 #include "font.h"
  36 #include <dcp/mono_picture_mxf.h>
  37 #include <dcp/stereo_picture_mxf.h>
  38 #include <dcp/sound_mxf.h>
  39 #include <dcp/sound_mxf_writer.h>
  40 #include <dcp/reel.h>
  41 #include <dcp/reel_mono_picture_asset.h>
  42 #include <dcp/reel_stereo_picture_asset.h>
  43 #include <dcp/reel_sound_asset.h>
  44 #include <dcp/reel_subtitle_asset.h>
  45 #include <dcp/dcp.h>
  46 #include <dcp/cpl.h>
  47 #include <dcp/signer.h>
  48 #include <dcp/interop_subtitle_content.h>
  49 #include <fstream>
  50 #include <cerrno>
  51
  52 #include "i18n.h"
  53
  54 #define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
  55 #define LOG_TIMING(...) _film->log()->microsecond_log (String::compose (__VA_ARGS__), Log::TYPE_TIMING);
  56 #define LOG_WARNING_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_WARNING);
  57 #define LOG_WARNING(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_WARNING);
  58 #define LOG_ERROR(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_ERROR);
  59 #define LOG_DEBUG(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_DEBUG);
  60 #define LOG_DEBUG_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_DEBUG);
  61
  62 /* OS X strikes again */
  63 #undef set_key
  64
  65 using std::make_pair;
  66 using std::pair;
  67 using std::string;
  68 using std::list;
  69 using std::cout;
  70 using boost::shared_ptr;
  71 using boost::weak_ptr;
  72 using boost::dynamic_pointer_cast;
  73
  74 int const Writer::_maximum_frames_in_memory = Config::instance()->num_local_encoding_threads() + 4;
  75
  76 Writer::Writer (shared_ptr<const Film> f, weak_ptr<Job> j)
  77         : _film (f)
  78         , _job (j)
  79         , _first_nonexistant_frame (0)
  80         , _thread (0)
  81         , _finish (false)
  82         , _queued_full_in_memory (0)
  83         , _last_written_frame (-1)
  84         , _last_written_eyes (EYES_RIGHT)
  85         , _full_written (0)
  86         , _fake_written (0)
  87         , _pushed_to_disk (0)
  88 {
  89         /* Remove any old DCP */
  90         boost::filesystem::remove_all (_film->dir (_film->dcp_name ()));
  91
  92         shared_ptr<Job> job = _job.lock ();
  93         DCPOMATIC_ASSERT (job);
  94
  95         job->sub (_("Checking existing image data"));
  96         check_existing_picture_mxf ();
  97
  98         /* Create our picture asset in a subdirectory, named according to those
  99            film's parameters which affect the video output.  We will hard-link
 100            it into the DCP later.
 101         */
 102
 103         if (_film->three_d ()) {
 104                 _picture_mxf.reset (new dcp::StereoPictureMXF (dcp::Fraction (_film->video_frame_rate (), 1)));
 105         } else {
 106                 _picture_mxf.reset (new dcp::MonoPictureMXF (dcp::Fraction (_film->video_frame_rate (), 1)));
 107         }
 108
 109         _picture_mxf->set_size (_film->frame_size ());
 110
 111         if (_film->encrypted ()) {
 112                 _picture_mxf->set_key (_film->key ());
 113         }
 114
 115         _picture_mxf_writer = _picture_mxf->start_write (
 116                 _film->internal_video_mxf_dir() / _film->internal_video_mxf_filename(),
 117                 _film->interop() ? dcp::INTEROP : dcp::SMPTE,
 118                 _first_nonexistant_frame > 0
 119                 );
 120
 121         if (_film->audio_channels ()) {
 122                 _sound_mxf.reset (new dcp::SoundMXF (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels ()));
 123
 124                 if (_film->encrypted ()) {
 125                         _sound_mxf->set_key (_film->key ());
 126                 }
 127
 128                 /* Write the sound MXF into the film directory so that we leave the creation
 129                    of the DCP directory until the last minute.
 130                 */
 131                 _sound_mxf_writer = _sound_mxf->start_write (_film->directory() / _film->audio_mxf_filename(), _film->interop() ? dcp::INTEROP : dcp::SMPTE);
 132         }
 133
 134         /* Check that the signer is OK if we need one */
 135         if (_film->is_signed() && !Config::instance()->signer()->valid ()) {
 136                 throw InvalidSignerError ();
 137         }
 138
 139         _thread = new boost::thread (boost::bind (&Writer::thread, this));
 140
 141         job->sub (_("Encoding image data"));
 142 }
 143
 144 Writer::~Writer ()
 145 {
 146         terminate_thread (false);
 147 }
 148
 149 void
 150 Writer::write (shared_ptr<const EncodedData> encoded, int frame, Eyes eyes)
 151 {
 152         boost::mutex::scoped_lock lock (_mutex);
 153
 154         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 155                 /* The queue is too big; wait until that is sorted out */
 156                 _full_condition.wait (lock);
 157         }
 158
 159         QueueItem qi;
 160         qi.type = QueueItem::FULL;
 161         qi.encoded = encoded;
 162         qi.frame = frame;
 163
 164         if (_film->three_d() && eyes == EYES_BOTH) {
 165                 /* 2D material in a 3D DCP; fake the 3D */
 166                 qi.eyes = EYES_LEFT;
 167                 _queue.push_back (qi);
 168                 ++_queued_full_in_memory;
 169                 qi.eyes = EYES_RIGHT;
 170                 _queue.push_back (qi);
 171                 ++_queued_full_in_memory;
 172         } else {
 173                 qi.eyes = eyes;
 174                 _queue.push_back (qi);
 175                 ++_queued_full_in_memory;
 176         }
 177
 178         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 179         _empty_condition.notify_all ();
 180 }
 181
 182 void
 183 Writer::fake_write (int frame, Eyes eyes)
 184 {
 185         boost::mutex::scoped_lock lock (_mutex);
 186
 187         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 188                 /* The queue is too big; wait until that is sorted out */
 189                 _full_condition.wait (lock);
 190         }
 191
 192         FILE* ifi = fopen_boost (_film->info_path (frame, eyes), "r");
 193         dcp::FrameInfo info (ifi);
 194         fclose (ifi);
 195
 196         QueueItem qi;
 197         qi.type = QueueItem::FAKE;
 198         qi.size = info.size;
 199         qi.frame = frame;
 200         if (_film->three_d() && eyes == EYES_BOTH) {
 201                 qi.eyes = EYES_LEFT;
 202                 _queue.push_back (qi);
 203                 qi.eyes = EYES_RIGHT;
 204                 _queue.push_back (qi);
 205         } else {
 206                 qi.eyes = eyes;
 207                 _queue.push_back (qi);
 208         }
 209
 210         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 211         _empty_condition.notify_all ();
 212 }
 213
 214 /** This method is not thread safe */
 215 void
 216 Writer::write (shared_ptr<const AudioBuffers> audio)
 217 {
 218         if (_sound_mxf_writer) {
 219                 _sound_mxf_writer->write (audio->data(), audio->frames());
 220         }
 221 }
 222
 223 /** This must be called from Writer::thread() with an appropriate lock held */
 224 bool
 225 Writer::have_sequenced_image_at_queue_head ()
 226 {
 227         if (_queue.empty ()) {
 228                 return false;
 229         }
 230
 231         _queue.sort ();
 232
 233         /* The queue should contain only EYES_LEFT/EYES_RIGHT pairs or EYES_BOTH */
 234
 235         if (_queue.front().eyes == EYES_BOTH) {
 236                 /* 2D */
 237                 return _queue.front().frame == (_last_written_frame + 1);
 238         }
 239
 240         /* 3D */
 241
 242         if (_last_written_eyes == EYES_LEFT && _queue.front().frame == _last_written_frame && _queue.front().eyes == EYES_RIGHT) {
 243                 return true;
 244         }
 245
 246         if (_last_written_eyes == EYES_RIGHT && _queue.front().frame == (_last_written_frame + 1) && _queue.front().eyes == EYES_LEFT) {
 247                 return true;
 248         }
 249
 250         return false;
 251 }
 252
 253 void
 254 Writer::thread ()
 255 try
 256 {
 257         while (true)
 258         {
 259                 boost::mutex::scoped_lock lock (_mutex);
 260
 261                 /* This is for debugging only */
 262                 bool done_something = false;
 263
 264                 while (true) {
 265
 266                         if (_finish || _queued_full_in_memory > _maximum_frames_in_memory || have_sequenced_image_at_queue_head ()) {
 267                                 /* We've got something to do: go and do it */
 268                                 break;
 269                         }
 270
 271                         /* Nothing to do: wait until something happens which may indicate that we do */
 272                         LOG_TIMING (N_("writer sleeps with a queue of %1"), _queue.size());
 273                         _empty_condition.wait (lock);
 274                         LOG_TIMING (N_("writer wakes with a queue of %1"), _queue.size());
 275                 }
 276
 277                 if (_finish && _queue.empty()) {
 278                         return;
 279                 }
 280
 281                 /* We stop here if we have been asked to finish, and if either the queue
 282                    is empty or we do not have a sequenced image at its head (if this is the
 283                    case we will never terminate as no new frames will be sent once
 284                    _finish is true).
 285                 */
 286                 if (_finish && (!have_sequenced_image_at_queue_head() || _queue.empty())) {
 287                         done_something = true;
 288                         /* (Hopefully temporarily) log anything that was not written */
 289                         if (!_queue.empty() && !have_sequenced_image_at_queue_head()) {
 290                                 LOG_WARNING (N_("Finishing writer with a left-over queue of %1:"), _queue.size());
 291                                 for (list<QueueItem>::const_iterator i = _queue.begin(); i != _queue.end(); ++i) {
 292                                         LOG_WARNING (N_("- type %1, size %2, frame %3, eyes %4"), i->type, i->size, i->frame, i->eyes);
 293                                 }
 294                                 LOG_WARNING (N_("Last written frame %1, last written eyes %2"), _last_written_frame, _last_written_eyes);
 295                         }
 296                         return;
 297                 }
 298                 /* Write any frames that we can write; i.e. those that are in sequence. */
 299                 while (have_sequenced_image_at_queue_head ()) {
 300                         done_something = true;
 301                         QueueItem qi = _queue.front ();
 302                         _queue.pop_front ();
 303                         if (qi.type == QueueItem::FULL && qi.encoded) {
 304                                 --_queued_full_in_memory;
 305                         }
 306
 307                         lock.unlock ();
 308                         switch (qi.type) {
 309                         case QueueItem::FULL:
 310                         {
 311                                 LOG_GENERAL (N_("Writer FULL-writes %1 to MXF"), qi.frame);
 312                                 if (!qi.encoded) {
 313                                         qi.encoded.reset (new EncodedData (_film->j2c_path (qi.frame, qi.eyes, false)));
 314                                 }
 315
 316                                 dcp::FrameInfo fin = _picture_mxf_writer->write (qi.encoded->data(), qi.encoded->size());
 317                                 qi.encoded->write_info (_film, qi.frame, qi.eyes, fin);
 318                                 _last_written[qi.eyes] = qi.encoded;
 319                                 ++_full_written;
 320                                 break;
 321                         }
 322                         case QueueItem::FAKE:
 323                                 LOG_GENERAL (N_("Writer FAKE-writes %1 to MXF"), qi.frame);
 324                                 _picture_mxf_writer->fake_write (qi.size);
 325                                 _last_written[qi.eyes].reset ();
 326                                 ++_fake_written;
 327                                 break;
 328                         }
 329                         lock.lock ();
 330
 331                         _last_written_frame = qi.frame;
 332                         _last_written_eyes = qi.eyes;
 333
 334                         shared_ptr<Job> job = _job.lock ();
 335                         DCPOMATIC_ASSERT (job);
 336                         int64_t total = _film->length().frames (_film->video_frame_rate ());
 337                         if (_film->three_d ()) {
 338                                 /* _full_written and so on are incremented for each eye, so we need to double the total
 339                                    frames to get the correct progress.
 340                                 */
 341                                 total *= 2;
 342                         }
 343                         if (total) {
 344                                 job->set_progress (float (_full_written + _fake_written) / total);
 345                         }
 346                 }
 347
 348                 while (_queued_full_in_memory > _maximum_frames_in_memory) {
 349                         done_something = true;
 350                         /* Too many frames in memory which can't yet be written to the stream.
 351                            Write some FULL frames to disk.
 352                         */
 353
 354                         /* Find one from the back of the queue */
 355                         _queue.sort ();
 356                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 357                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 358                                 ++i;
 359                         }
 360
 361                         DCPOMATIC_ASSERT (i != _queue.rend());
 362                         QueueItem qi = *i;
 363
 364                         ++_pushed_to_disk;
 365
 366                         lock.unlock ();
 367
 368                         LOG_GENERAL (
 369                                 "Writer full (awaiting %1 [last eye was %2]); pushes %3 to disk",
 370                                 _last_written_frame + 1,
 371                                 _last_written_eyes, qi.frame
 372                                 );
 373
 374                         qi.encoded->write (_film, qi.frame, qi.eyes);
 375                         lock.lock ();
 376                         qi.encoded.reset ();
 377                         --_queued_full_in_memory;
 378                 }
 379
 380                 if (!done_something) {
 381                         LOG_DEBUG_NC ("Writer loop ran without doing anything");
 382                         LOG_DEBUG ("_queued_full_in_memory=%1", _queued_full_in_memory);
 383                         LOG_DEBUG ("_queue_size=%1", _queue.size ());
 384                         LOG_DEBUG ("_finish=%1", _finish);
 385                         LOG_DEBUG ("_last_written_frame=%1", _last_written_frame);
 386                 }
 387
 388                 /* The queue has probably just gone down a bit; notify anything wait()ing on _full_condition */
 389                 _full_condition.notify_all ();
 390         }
 391 }
 392 catch (...)
 393 {
 394         store_current ();
 395 }
 396
 397 void
 398 Writer::terminate_thread (bool can_throw)
 399 {
 400         boost::mutex::scoped_lock lock (_mutex);
 401         if (_thread == 0) {
 402                 return;
 403         }
 404
 405         _finish = true;
 406         _empty_condition.notify_all ();
 407         _full_condition.notify_all ();
 408         lock.unlock ();
 409
 410         _thread->join ();
 411         if (can_throw) {
 412                 rethrow ();
 413         }
 414
 415         delete _thread;
 416         _thread = 0;
 417 }
 418
 419 void
 420 Writer::finish ()
 421 {
 422         if (!_thread) {
 423                 return;
 424         }
 425
 426         terminate_thread (true);
 427
 428         _picture_mxf_writer->finalize ();
 429         if (_sound_mxf_writer) {
 430                 _sound_mxf_writer->finalize ();
 431         }
 432
 433         /* Hard-link the video MXF into the DCP */
 434         boost::filesystem::path video_from;
 435         video_from /= _film->internal_video_mxf_dir();
 436         video_from /= _film->internal_video_mxf_filename();
 437
 438         boost::filesystem::path video_to;
 439         video_to /= _film->dir (_film->dcp_name());
 440         video_to /= _film->video_mxf_filename ();
 441
 442         boost::system::error_code ec;
 443         boost::filesystem::create_hard_link (video_from, video_to, ec);
 444         if (ec) {
 445                 LOG_WARNING_NC ("Hard-link failed; copying instead");
 446                 boost::filesystem::copy_file (video_from, video_to, ec);
 447                 if (ec) {
 448                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 449                         throw FileError (ec.message(), video_from);
 450                 }
 451         }
 452
 453         _picture_mxf->set_file (video_to);
 454
 455         /* Move the audio MXF into the DCP */
 456
 457         if (_sound_mxf) {
 458                 boost::filesystem::path audio_to;
 459                 audio_to /= _film->dir (_film->dcp_name ());
 460                 audio_to /= _film->audio_mxf_filename ();
 461
 462                 boost::filesystem::rename (_film->file (_film->audio_mxf_filename ()), audio_to, ec);
 463                 if (ec) {
 464                         throw FileError (
 465                                 String::compose (_("could not move audio MXF into the DCP (%1)"), ec.value ()), _film->file (_film->audio_mxf_filename ())
 466                                 );
 467                 }
 468
 469                 _sound_mxf->set_file (audio_to);
 470         }
 471
 472         dcp::DCP dcp (_film->dir (_film->dcp_name()));
 473
 474         shared_ptr<dcp::CPL> cpl (
 475                 new dcp::CPL (
 476                         _film->dcp_name(),
 477                         _film->dcp_content_type()->libdcp_kind ()
 478                         )
 479                 );
 480
 481         dcp.add (cpl);
 482
 483         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 484
 485         shared_ptr<dcp::MonoPictureMXF> mono = dynamic_pointer_cast<dcp::MonoPictureMXF> (_picture_mxf);
 486         if (mono) {
 487                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelMonoPictureAsset (mono, 0)));
 488                 dcp.add (mono);
 489         }
 490
 491         shared_ptr<dcp::StereoPictureMXF> stereo = dynamic_pointer_cast<dcp::StereoPictureMXF> (_picture_mxf);
 492         if (stereo) {
 493                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelStereoPictureAsset (stereo, 0)));
 494                 dcp.add (stereo);
 495         }
 496
 497         if (_sound_mxf) {
 498                 reel->add (shared_ptr<dcp::ReelSoundAsset> (new dcp::ReelSoundAsset (_sound_mxf, 0)));
 499                 dcp.add (_sound_mxf);
 500         }
 501
 502         if (_subtitle_content) {
 503                 _subtitle_content->write_xml (_film->dir (_film->dcp_name ()) / _film->subtitle_xml_filename ());
 504                 reel->add (shared_ptr<dcp::ReelSubtitleAsset> (
 505                                    new dcp::ReelSubtitleAsset (
 506                                            _subtitle_content,
 507                                            dcp::Fraction (_film->video_frame_rate(), 1),
 508                                            _picture_mxf->intrinsic_duration (),
 509                                            0
 510                                            )
 511                                    ));
 512
 513                 dcp.add (_subtitle_content);
 514         }
 515
 516         cpl->add (reel);
 517
 518         shared_ptr<Job> job = _job.lock ();
 519         DCPOMATIC_ASSERT (job);
 520
 521         job->sub (_("Computing image digest"));
 522         _picture_mxf->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 523
 524         if (_sound_mxf) {
 525                 job->sub (_("Computing audio digest"));
 526                 _sound_mxf->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 527         }
 528
 529         dcp::XMLMetadata meta;
 530         meta.issuer = Config::instance()->dcp_issuer ();
 531         meta.creator = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 532         meta.set_issue_date_now ();
 533
 534         shared_ptr<const dcp::Signer> signer;
 535         if (_film->is_signed ()) {
 536                 signer = Config::instance()->signer ();
 537                 /* We did check earlier, but check again here to be on the safe side */
 538                 if (!signer->valid ()) {
 539                         throw InvalidSignerError ();
 540                 }
 541         }
 542
 543         dcp.write_xml (_film->interop () ? dcp::INTEROP : dcp::SMPTE, meta, signer);
 544
 545         LOG_GENERAL (
 546                 N_("Wrote %1 FULL, %2 FAKE, %3 pushed to disk"), _full_written, _fake_written, _pushed_to_disk
 547                 );
 548 }
 549
 550 bool
 551 Writer::check_existing_picture_mxf_frame (FILE* mxf, int f, Eyes eyes)
 552 {
 553         /* Read the frame info as written */
 554         FILE* ifi = fopen_boost (_film->info_path (f, eyes), "r");
 555         if (!ifi) {
 556                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 557                 return false;
 558         }
 559
 560         dcp::FrameInfo info (ifi);
 561         fclose (ifi);
 562         if (info.size == 0) {
 563                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 564                 return false;
 565         }
 566
 567         /* Read the data from the MXF and hash it */
 568         dcpomatic_fseek (mxf, info.offset, SEEK_SET);
 569         EncodedData data (info.size);
 570         size_t const read = fread (data.data(), 1, data.size(), mxf);
 571         if (read != static_cast<size_t> (data.size ())) {
 572                 LOG_GENERAL ("Existing frame %1 is incomplete", f);
 573                 return false;
 574         }
 575
 576         MD5Digester digester;
 577         digester.add (data.data(), data.size());
 578         if (digester.get() != info.hash) {
 579                 LOG_GENERAL ("Existing frame %1 failed hash check", f);
 580                 return false;
 581         }
 582
 583         return true;
 584 }
 585
 586 void
 587 Writer::check_existing_picture_mxf ()
 588 {
 589         /* Try to open the existing MXF */
 590         boost::filesystem::path p;
 591         p /= _film->internal_video_mxf_dir ();
 592         p /= _film->internal_video_mxf_filename ();
 593         FILE* mxf = fopen_boost (p, "rb");
 594         if (!mxf) {
 595                 LOG_GENERAL ("Could not open existing MXF at %1 (errno=%2)", p.string(), errno);
 596                 return;
 597         }
 598
 599         int N = 0;
 600         for (boost::filesystem::directory_iterator i (_film->info_dir ()); i != boost::filesystem::directory_iterator (); ++i) {
 601                 ++N;
 602         }
 603
 604         while (true) {
 605
 606                 shared_ptr<Job> job = _job.lock ();
 607                 DCPOMATIC_ASSERT (job);
 608
 609                 if (N > 0) {
 610                         job->set_progress (float (_first_nonexistant_frame) / N);
 611                 }
 612
 613                 if (_film->three_d ()) {
 614                         if (!check_existing_picture_mxf_frame (mxf, _first_nonexistant_frame, EYES_LEFT)) {
 615                                 break;
 616                         }
 617                         if (!check_existing_picture_mxf_frame (mxf, _first_nonexistant_frame, EYES_RIGHT)) {
 618                                 break;
 619                         }
 620                 } else {
 621                         if (!check_existing_picture_mxf_frame (mxf, _first_nonexistant_frame, EYES_BOTH)) {
 622                                 break;
 623                         }
 624                 }
 625
 626                 LOG_GENERAL ("Have existing frame %1", _first_nonexistant_frame);
 627                 ++_first_nonexistant_frame;
 628         }
 629
 630         fclose (mxf);
 631 }
 632
 633 /** @param frame Frame index.
 634  *  @return true if we can fake-write this frame.
 635  */
 636 bool
 637 Writer::can_fake_write (int frame) const
 638 {
 639         /* We have to do a proper write of the first frame so that we can set up the JPEG2000
 640            parameters in the MXF writer.
 641         */
 642         return (frame != 0 && frame < _first_nonexistant_frame);
 643 }
 644
 645 void
 646 Writer::write (PlayerSubtitles subs)
 647 {
 648         if (subs.text.empty ()) {
 649                 return;
 650         }
 651
 652         if (!_subtitle_content) {
 653                 _subtitle_content.reset (new dcp::InteropSubtitleContent (_film->name(), _film->subtitle_language ()));
 654         }
 655
 656         for (list<dcp::SubtitleString>::const_iterator i = subs.text.begin(); i != subs.text.end(); ++i) {
 657                 _subtitle_content->add (*i);
 658         }
 659 }
 660
 661 void
 662 Writer::write (list<shared_ptr<Font> > fonts)
 663 {
 664         if (fonts.empty ()) {
 665                 return;
 666         }
 667
 668         if (!_subtitle_content) {
 669                 _subtitle_content.reset (new dcp::InteropSubtitleContent (_film->name(), _film->subtitle_language ()));
 670         }
 671
 672         for (list<shared_ptr<Font> >::const_iterator i = fonts.begin(); i != fonts.end(); ++i) {
 673                 /* XXX: this LiberationSans-Regular needs to be a path to a DCP-o-matic-distributed copy */
 674                 _subtitle_content->add_font ((*i)->id, (*i)->file.get_value_or ("LiberationSans-Regular.ttf").leaf().string ());
 675         }
 676 }
 677
 678 bool
 679 operator< (QueueItem const & a, QueueItem const & b)
 680 {
 681         if (a.frame != b.frame) {
 682                 return a.frame < b.frame;
 683         }
 684
 685         return static_cast<int> (a.eyes) < static_cast<int> (b.eyes);
 686 }
 687
 688 bool
 689 operator== (QueueItem const & a, QueueItem const & b)
 690 {
 691         return a.frame == b.frame && a.eyes == b.eyes;
 692 }