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 "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 <dcp/font.h>
  50 #include <boost/foreach.hpp>
  51 #include <fstream>
  52 #include <cerrno>
  53
  54 #include "i18n.h"
  55
  56 #define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
  57 #define LOG_TIMING(...) _film->log()->microsecond_log (String::compose (__VA_ARGS__), Log::TYPE_TIMING);
  58 #define LOG_WARNING_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_WARNING);
  59 #define LOG_WARNING(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_WARNING);
  60 #define LOG_ERROR(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_ERROR);
  61 #define LOG_DEBUG(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_DEBUG);
  62 #define LOG_DEBUG_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_DEBUG);
  63
  64 /* OS X strikes again */
  65 #undef set_key
  66
  67 using std::make_pair;
  68 using std::pair;
  69 using std::string;
  70 using std::list;
  71 using std::cout;
  72 using boost::shared_ptr;
  73 using boost::weak_ptr;
  74 using boost::dynamic_pointer_cast;
  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         /* Create our picture asset in a subdirectory, named according to those
  96            film's parameters which affect the video output.  We will hard-link
  97            it into the DCP later.
  98         */
  99
 100         if (_film->three_d ()) {
 101                 _picture_mxf.reset (new dcp::StereoPictureMXF (dcp::Fraction (_film->video_frame_rate (), 1)));
 102         } else {
 103                 _picture_mxf.reset (new dcp::MonoPictureMXF (dcp::Fraction (_film->video_frame_rate (), 1)));
 104         }
 105
 106         job->sub (_("Checking existing image data"));
 107         check_existing_picture_mxf ();
 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* file = fopen_boost (_film->info_file (), "rb");
 193         if (!file) {
 194                 throw ReadFileError (_film->info_file ());
 195         }
 196         dcp::FrameInfo info = read_frame_info (file, frame, eyes);
 197         fclose (file);
 198
 199         QueueItem qi;
 200         qi.type = QueueItem::FAKE;
 201         qi.size = info.size;
 202         qi.frame = frame;
 203         if (_film->three_d() && eyes == EYES_BOTH) {
 204                 qi.eyes = EYES_LEFT;
 205                 _queue.push_back (qi);
 206                 qi.eyes = EYES_RIGHT;
 207                 _queue.push_back (qi);
 208         } else {
 209                 qi.eyes = eyes;
 210                 _queue.push_back (qi);
 211         }
 212
 213         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 214         _empty_condition.notify_all ();
 215 }
 216
 217 /** This method is not thread safe */
 218 void
 219 Writer::write (shared_ptr<const AudioBuffers> audio)
 220 {
 221         if (_sound_mxf_writer) {
 222                 _sound_mxf_writer->write (audio->data(), audio->frames());
 223         }
 224 }
 225
 226 /** This must be called from Writer::thread() with an appropriate lock held */
 227 bool
 228 Writer::have_sequenced_image_at_queue_head ()
 229 {
 230         if (_queue.empty ()) {
 231                 return false;
 232         }
 233
 234         _queue.sort ();
 235
 236         /* The queue should contain only EYES_LEFT/EYES_RIGHT pairs or EYES_BOTH */
 237
 238         if (_queue.front().eyes == EYES_BOTH) {
 239                 /* 2D */
 240                 return _queue.front().frame == (_last_written_frame + 1);
 241         }
 242
 243         /* 3D */
 244
 245         if (_last_written_eyes == EYES_LEFT && _queue.front().frame == _last_written_frame && _queue.front().eyes == EYES_RIGHT) {
 246                 return true;
 247         }
 248
 249         if (_last_written_eyes == EYES_RIGHT && _queue.front().frame == (_last_written_frame + 1) && _queue.front().eyes == EYES_LEFT) {
 250                 return true;
 251         }
 252
 253         return false;
 254 }
 255
 256 void
 257 Writer::thread ()
 258 try
 259 {
 260         while (true)
 261         {
 262                 boost::mutex::scoped_lock lock (_mutex);
 263
 264                 /* This is for debugging only */
 265                 bool done_something = false;
 266
 267                 while (true) {
 268
 269                         if (_finish || _queued_full_in_memory > maximum_frames_in_memory () || have_sequenced_image_at_queue_head ()) {
 270                                 /* We've got something to do: go and do it */
 271                                 break;
 272                         }
 273
 274                         /* Nothing to do: wait until something happens which may indicate that we do */
 275                         LOG_TIMING (N_("writer sleeps with a queue of %1"), _queue.size());
 276                         _empty_condition.wait (lock);
 277                         LOG_TIMING (N_("writer wakes with a queue of %1"), _queue.size());
 278                 }
 279
 280                 if (_finish && _queue.empty()) {
 281                         return;
 282                 }
 283
 284                 /* We stop here if we have been asked to finish, and if either the queue
 285                    is empty or we do not have a sequenced image at its head (if this is the
 286                    case we will never terminate as no new frames will be sent once
 287                    _finish is true).
 288                 */
 289                 if (_finish && (!have_sequenced_image_at_queue_head() || _queue.empty())) {
 290                         done_something = true;
 291                         /* (Hopefully temporarily) log anything that was not written */
 292                         if (!_queue.empty() && !have_sequenced_image_at_queue_head()) {
 293                                 LOG_WARNING (N_("Finishing writer with a left-over queue of %1:"), _queue.size());
 294                                 for (list<QueueItem>::const_iterator i = _queue.begin(); i != _queue.end(); ++i) {
 295                                         if (i->type == QueueItem::FULL) {
 296                                                 LOG_WARNING (N_("- type FULL, frame %1, eyes %2"), i->frame, i->eyes);
 297                                         } else {
 298                                                 LOG_WARNING (N_("- type FAKE, size %1, frame %2, eyes %3"), i->size, i->frame, i->eyes);
 299                                         }
 300                                 }
 301                                 LOG_WARNING (N_("Last written frame %1, last written eyes %2"), _last_written_frame, _last_written_eyes);
 302                         }
 303                         return;
 304                 }
 305                 /* Write any frames that we can write; i.e. those that are in sequence. */
 306                 while (have_sequenced_image_at_queue_head ()) {
 307                         done_something = true;
 308                         QueueItem qi = _queue.front ();
 309                         _queue.pop_front ();
 310                         if (qi.type == QueueItem::FULL && qi.encoded) {
 311                                 --_queued_full_in_memory;
 312                         }
 313
 314                         lock.unlock ();
 315                         switch (qi.type) {
 316                         case QueueItem::FULL:
 317                         {
 318                                 LOG_GENERAL (N_("Writer FULL-writes %1 to MXF"), qi.frame);
 319                                 if (!qi.encoded) {
 320                                         qi.encoded.reset (new EncodedData (_film->j2c_path (qi.frame, qi.eyes, false)));
 321                                 }
 322
 323                                 dcp::FrameInfo fin = _picture_mxf_writer->write (qi.encoded->data(), qi.encoded->size());
 324                                 qi.encoded->write_info (_film, qi.frame, qi.eyes, fin);
 325                                 _last_written[qi.eyes] = qi.encoded;
 326                                 ++_full_written;
 327                                 break;
 328                         }
 329                         case QueueItem::FAKE:
 330                                 LOG_GENERAL (N_("Writer FAKE-writes %1 to MXF"), qi.frame);
 331                                 _picture_mxf_writer->fake_write (qi.size);
 332                                 _last_written[qi.eyes].reset ();
 333                                 ++_fake_written;
 334                                 break;
 335                         }
 336                         lock.lock ();
 337
 338                         _last_written_frame = qi.frame;
 339                         _last_written_eyes = qi.eyes;
 340
 341                         shared_ptr<Job> job = _job.lock ();
 342                         DCPOMATIC_ASSERT (job);
 343                         int64_t total = _film->length().frames (_film->video_frame_rate ());
 344                         if (_film->three_d ()) {
 345                                 /* _full_written and so on are incremented for each eye, so we need to double the total
 346                                    frames to get the correct progress.
 347                                 */
 348                                 total *= 2;
 349                         }
 350                         if (total) {
 351                                 job->set_progress (float (_full_written + _fake_written) / total);
 352                         }
 353                 }
 354
 355                 while (_queued_full_in_memory > maximum_frames_in_memory ()) {
 356                         done_something = true;
 357                         /* Too many frames in memory which can't yet be written to the stream.
 358                            Write some FULL frames to disk.
 359                         */
 360
 361                         /* Find one from the back of the queue */
 362                         _queue.sort ();
 363                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 364                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 365                                 ++i;
 366                         }
 367
 368                         DCPOMATIC_ASSERT (i != _queue.rend());
 369                         ++_pushed_to_disk;
 370                         lock.unlock ();
 371
 372                         /* i is valid here, even though we don't hold a lock on the mutex,
 373                            since list iterators are unaffected by insertion and only this
 374                            thread could erase the last item in the list.
 375                         */
 376
 377                         LOG_GENERAL (
 378                                 "Writer full (awaiting %1 [last eye was %2]); pushes %3 to disk",
 379                                 _last_written_frame + 1,
 380                                 _last_written_eyes, i->frame
 381                                 );
 382
 383                         i->encoded->write (_film, i->frame, i->eyes);
 384
 385                         lock.lock ();
 386                         i->encoded.reset ();
 387                         --_queued_full_in_memory;
 388                 }
 389
 390                 if (!done_something) {
 391                         LOG_DEBUG_NC ("Writer loop ran without doing anything");
 392                         LOG_DEBUG ("_queued_full_in_memory=%1", _queued_full_in_memory);
 393                         LOG_DEBUG ("_queue_size=%1", _queue.size ());
 394                         LOG_DEBUG ("_finish=%1", _finish);
 395                         LOG_DEBUG ("_last_written_frame=%1", _last_written_frame);
 396                 }
 397
 398                 /* The queue has probably just gone down a bit; notify anything wait()ing on _full_condition */
 399                 _full_condition.notify_all ();
 400         }
 401 }
 402 catch (...)
 403 {
 404         store_current ();
 405 }
 406
 407 void
 408 Writer::terminate_thread (bool can_throw)
 409 {
 410         boost::mutex::scoped_lock lock (_mutex);
 411         if (_thread == 0) {
 412                 return;
 413         }
 414
 415         _finish = true;
 416         _empty_condition.notify_all ();
 417         _full_condition.notify_all ();
 418         lock.unlock ();
 419
 420         _thread->join ();
 421         if (can_throw) {
 422                 rethrow ();
 423         }
 424
 425         delete _thread;
 426         _thread = 0;
 427 }
 428
 429 void
 430 Writer::finish ()
 431 {
 432         if (!_thread) {
 433                 return;
 434         }
 435
 436         terminate_thread (true);
 437
 438         _picture_mxf_writer->finalize ();
 439         if (_sound_mxf_writer) {
 440                 _sound_mxf_writer->finalize ();
 441         }
 442
 443         /* Hard-link the video MXF into the DCP */
 444         boost::filesystem::path video_from = _picture_mxf->file ();
 445
 446         boost::filesystem::path video_to;
 447         video_to /= _film->dir (_film->dcp_name());
 448         video_to /= _film->video_mxf_filename ();
 449
 450         boost::system::error_code ec;
 451         boost::filesystem::create_hard_link (video_from, video_to, ec);
 452         if (ec) {
 453                 LOG_WARNING_NC ("Hard-link failed; copying instead");
 454                 boost::filesystem::copy_file (video_from, video_to, ec);
 455                 if (ec) {
 456                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 457                         throw FileError (ec.message(), video_from);
 458                 }
 459         }
 460
 461         _picture_mxf->set_file (video_to);
 462
 463         /* Move the audio MXF into the DCP */
 464
 465         if (_sound_mxf) {
 466                 boost::filesystem::path audio_to;
 467                 audio_to /= _film->dir (_film->dcp_name ());
 468                 audio_to /= _film->audio_mxf_filename ();
 469
 470                 boost::filesystem::rename (_film->file (_film->audio_mxf_filename ()), audio_to, ec);
 471                 if (ec) {
 472                         throw FileError (
 473                                 String::compose (_("could not move audio MXF into the DCP (%1)"), ec.value ()), _film->file (_film->audio_mxf_filename ())
 474                                 );
 475                 }
 476
 477                 _sound_mxf->set_file (audio_to);
 478         }
 479
 480         dcp::DCP dcp (_film->dir (_film->dcp_name()));
 481
 482         shared_ptr<dcp::CPL> cpl (
 483                 new dcp::CPL (
 484                         _film->dcp_name(),
 485                         _film->dcp_content_type()->libdcp_kind ()
 486                         )
 487                 );
 488
 489         dcp.add (cpl);
 490
 491         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 492
 493         shared_ptr<dcp::MonoPictureMXF> mono = dynamic_pointer_cast<dcp::MonoPictureMXF> (_picture_mxf);
 494         if (mono) {
 495                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelMonoPictureAsset (mono, 0)));
 496                 dcp.add (mono);
 497         }
 498
 499         shared_ptr<dcp::StereoPictureMXF> stereo = dynamic_pointer_cast<dcp::StereoPictureMXF> (_picture_mxf);
 500         if (stereo) {
 501                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelStereoPictureAsset (stereo, 0)));
 502                 dcp.add (stereo);
 503         }
 504
 505         if (_sound_mxf) {
 506                 reel->add (shared_ptr<dcp::ReelSoundAsset> (new dcp::ReelSoundAsset (_sound_mxf, 0)));
 507                 dcp.add (_sound_mxf);
 508         }
 509
 510         if (_subtitle_content) {
 511                 boost::filesystem::path const liberation = shared_path () / "LiberationSans-Regular.ttf";
 512
 513                 /* Add all the fonts to the subtitle content and as assets to the DCP */
 514                 BOOST_FOREACH (shared_ptr<Font> i, _fonts) {
 515                         boost::filesystem::path const from = i->file.get_value_or (liberation);
 516                         _subtitle_content->add_font (i->id, from.leaf().string ());
 517
 518                         boost::filesystem::path to = _film->dir (_film->dcp_name ()) / _subtitle_content->id ();
 519                         boost::filesystem::create_directories (to, ec);
 520                         if (ec) {
 521                                 throw FileError (_("Could not create directory"), to);
 522                         }
 523
 524                         to /= from.leaf();
 525
 526                         boost::system::error_code ec;
 527                         boost::filesystem::copy_file (from, to, ec);
 528                         if (ec) {
 529                                 throw FileError ("Could not copy font to DCP", from);
 530                         }
 531
 532                         dcp.add (shared_ptr<dcp::Font> (new dcp::Font (to)));
 533                 }
 534
 535                 _subtitle_content->write_xml (_film->dir (_film->dcp_name ()) / _subtitle_content->id () / _film->subtitle_xml_filename ());
 536                 reel->add (shared_ptr<dcp::ReelSubtitleAsset> (
 537                                    new dcp::ReelSubtitleAsset (
 538                                            _subtitle_content,
 539                                            dcp::Fraction (_film->video_frame_rate(), 1),
 540                                            _picture_mxf->intrinsic_duration (),
 541                                            0
 542                                            )
 543                                    ));
 544
 545                 dcp.add (_subtitle_content);
 546         }
 547
 548         cpl->add (reel);
 549
 550         shared_ptr<Job> job = _job.lock ();
 551         DCPOMATIC_ASSERT (job);
 552
 553         job->sub (_("Computing image digest"));
 554         _picture_mxf->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 555
 556         if (_sound_mxf) {
 557                 job->sub (_("Computing audio digest"));
 558                 _sound_mxf->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 559         }
 560
 561         dcp::XMLMetadata meta;
 562         meta.issuer = Config::instance()->dcp_issuer ();
 563         meta.creator = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 564         meta.set_issue_date_now ();
 565
 566         shared_ptr<const dcp::Signer> signer;
 567         if (_film->is_signed ()) {
 568                 signer = Config::instance()->signer ();
 569                 /* We did check earlier, but check again here to be on the safe side */
 570                 if (!signer->valid ()) {
 571                         throw InvalidSignerError ();
 572                 }
 573         }
 574
 575         dcp.write_xml (_film->interop () ? dcp::INTEROP : dcp::SMPTE, meta, signer);
 576
 577         LOG_GENERAL (
 578                 N_("Wrote %1 FULL, %2 FAKE, %3 pushed to disk"), _full_written, _fake_written, _pushed_to_disk
 579                 );
 580 }
 581
 582 bool
 583 Writer::check_existing_picture_mxf_frame (FILE* mxf, int f, Eyes eyes)
 584 {
 585         /* Read the frame info as written */
 586         FILE* file = fopen_boost (_film->info_file (), "rb");
 587         if (!file) {
 588                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 589                 return false;
 590         }
 591
 592         dcp::FrameInfo info = read_frame_info (file, f, eyes);
 593         fclose (file);
 594         if (info.size == 0) {
 595                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 596                 return false;
 597         }
 598
 599         /* Read the data from the MXF and hash it */
 600         dcpomatic_fseek (mxf, info.offset, SEEK_SET);
 601         EncodedData data (info.size);
 602         size_t const read = fread (data.data(), 1, data.size(), mxf);
 603         if (read != static_cast<size_t> (data.size ())) {
 604                 LOG_GENERAL ("Existing frame %1 is incomplete", f);
 605                 return false;
 606         }
 607
 608         MD5Digester digester;
 609         digester.add (data.data(), data.size());
 610         if (digester.get() != info.hash) {
 611                 LOG_GENERAL ("Existing frame %1 failed hash check", f);
 612                 return false;
 613         }
 614
 615         return true;
 616 }
 617
 618 void
 619 Writer::check_existing_picture_mxf ()
 620 {
 621         /* Try to open the existing MXF */
 622         FILE* mxf = fopen_boost (_picture_mxf->file(), "rb");
 623         if (!mxf) {
 624                 LOG_GENERAL ("Could not open existing MXF at %1 (errno=%2)", _picture_mxf->file().string(), errno);
 625                 return;
 626         }
 627
 628         while (true) {
 629
 630                 shared_ptr<Job> job = _job.lock ();
 631                 DCPOMATIC_ASSERT (job);
 632
 633                 job->set_progress_unknown ();
 634
 635                 if (_film->three_d ()) {
 636                         if (!check_existing_picture_mxf_frame (mxf, _first_nonexistant_frame, EYES_LEFT)) {
 637                                 break;
 638                         }
 639                         if (!check_existing_picture_mxf_frame (mxf, _first_nonexistant_frame, EYES_RIGHT)) {
 640                                 break;
 641                         }
 642                 } else {
 643                         if (!check_existing_picture_mxf_frame (mxf, _first_nonexistant_frame, EYES_BOTH)) {
 644                                 break;
 645                         }
 646                 }
 647
 648                 LOG_GENERAL ("Have existing frame %1", _first_nonexistant_frame);
 649                 ++_first_nonexistant_frame;
 650         }
 651
 652         fclose (mxf);
 653 }
 654
 655 /** @param frame Frame index.
 656  *  @return true if we can fake-write this frame.
 657  */
 658 bool
 659 Writer::can_fake_write (int frame) const
 660 {
 661         /* We have to do a proper write of the first frame so that we can set up the JPEG2000
 662            parameters in the MXF writer.
 663         */
 664         return (frame != 0 && frame < _first_nonexistant_frame);
 665 }
 666
 667 void
 668 Writer::write (PlayerSubtitles subs)
 669 {
 670         if (subs.text.empty ()) {
 671                 return;
 672         }
 673
 674         if (!_subtitle_content) {
 675                 string lang = _film->subtitle_language ();
 676                 if (lang.empty ()) {
 677                         lang = "Unknown";
 678                 }
 679                 _subtitle_content.reset (new dcp::InteropSubtitleContent (_film->name(), lang));
 680         }
 681
 682         for (list<dcp::SubtitleString>::const_iterator i = subs.text.begin(); i != subs.text.end(); ++i) {
 683                 _subtitle_content->add (*i);
 684         }
 685 }
 686
 687 void
 688 Writer::write (list<shared_ptr<Font> > fonts)
 689 {
 690         /* Just keep a list of fonts and we'll deal with them in ::finish */
 691         copy (fonts.begin (), fonts.end (), back_inserter (_fonts));
 692 }
 693
 694 bool
 695 operator< (QueueItem const & a, QueueItem const & b)
 696 {
 697         if (a.frame != b.frame) {
 698                 return a.frame < b.frame;
 699         }
 700
 701         return static_cast<int> (a.eyes) < static_cast<int> (b.eyes);
 702 }
 703
 704 bool
 705 operator== (QueueItem const & a, QueueItem const & b)
 706 {
 707         return a.frame == b.frame && a.eyes == b.eyes;
 708 }
 709
 710 int
 711 Writer::maximum_frames_in_memory () const
 712 {
 713         return Config::instance()->num_local_encoding_threads() + 4;
 714 }