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 "util.h"
  37 #include <dcp/mono_picture_mxf.h>
  38 #include <dcp/stereo_picture_mxf.h>
  39 #include <dcp/sound_mxf.h>
  40 #include <dcp/sound_mxf_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_content.h>
  50 #include <dcp/font.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         , _full_written (0)
  87         , _fake_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_mxf.reset (new dcp::StereoPictureMXF (dcp::Fraction (_film->video_frame_rate (), 1)));
 103         } else {
 104                 _picture_mxf.reset (new dcp::MonoPictureMXF (dcp::Fraction (_film->video_frame_rate (), 1)));
 105         }
 106
 107         _picture_mxf->set_size (_film->frame_size ());
 108
 109         if (_film->encrypted ()) {
 110                 _picture_mxf->set_key (_film->key ());
 111         }
 112
 113         _picture_mxf_writer = _picture_mxf->start_write (
 114                 _film->internal_video_mxf_dir() / _film->internal_video_mxf_filename(),
 115                 _film->interop() ? dcp::INTEROP : dcp::SMPTE,
 116                 _first_nonexistant_frame > 0
 117                 );
 118
 119         if (_film->audio_channels ()) {
 120                 _sound_mxf.reset (new dcp::SoundMXF (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels ()));
 121
 122                 if (_film->encrypted ()) {
 123                         _sound_mxf->set_key (_film->key ());
 124                 }
 125
 126                 /* Write the sound MXF into the film directory so that we leave the creation
 127                    of the DCP directory until the last minute.
 128                 */
 129                 _sound_mxf_writer = _sound_mxf->start_write (_film->directory() / audio_mxf_filename (_sound_mxf), _film->interop() ? dcp::INTEROP : dcp::SMPTE);
 130         }
 131
 132         /* Check that the signer is OK if we need one */
 133         if (_film->is_signed() && !Config::instance()->signer()->valid ()) {
 134                 throw InvalidSignerError ();
 135         }
 136
 137         job->sub (_("Checking existing image data"));
 138         check_existing_picture_mxf ();
 139
 140         _thread = new boost::thread (boost::bind (&Writer::thread, this));
 141
 142         job->sub (_("Encoding image data"));
 143 }
 144
 145 Writer::~Writer ()
 146 {
 147         terminate_thread (false);
 148 }
 149
 150 void
 151 Writer::write (shared_ptr<const EncodedData> encoded, int frame, Eyes eyes)
 152 {
 153         boost::mutex::scoped_lock lock (_mutex);
 154
 155         while (_queued_full_in_memory > maximum_frames_in_memory ()) {
 156                 /* The queue is too big; wait until that is sorted out */
 157                 _full_condition.wait (lock);
 158         }
 159
 160         QueueItem qi;
 161         qi.type = QueueItem::FULL;
 162         qi.encoded = encoded;
 163         qi.frame = frame;
 164
 165         if (_film->three_d() && eyes == EYES_BOTH) {
 166                 /* 2D material in a 3D DCP; fake the 3D */
 167                 qi.eyes = EYES_LEFT;
 168                 _queue.push_back (qi);
 169                 ++_queued_full_in_memory;
 170                 qi.eyes = EYES_RIGHT;
 171                 _queue.push_back (qi);
 172                 ++_queued_full_in_memory;
 173         } else {
 174                 qi.eyes = eyes;
 175                 _queue.push_back (qi);
 176                 ++_queued_full_in_memory;
 177         }
 178
 179         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 180         _empty_condition.notify_all ();
 181 }
 182
 183 void
 184 Writer::fake_write (int frame, Eyes eyes)
 185 {
 186         boost::mutex::scoped_lock lock (_mutex);
 187
 188         while (_queued_full_in_memory > maximum_frames_in_memory ()) {
 189                 /* The queue is too big; wait until that is sorted out */
 190                 _full_condition.wait (lock);
 191         }
 192
 193         FILE* file = fopen_boost (_film->info_file (), "rb");
 194         if (!file) {
 195                 throw ReadFileError (_film->info_file ());
 196         }
 197         dcp::FrameInfo info = read_frame_info (file, frame, eyes);
 198         fclose (file);
 199
 200         QueueItem qi;
 201         qi.type = QueueItem::FAKE;
 202         qi.size = info.size;
 203         qi.frame = frame;
 204         if (_film->three_d() && eyes == EYES_BOTH) {
 205                 qi.eyes = EYES_LEFT;
 206                 _queue.push_back (qi);
 207                 qi.eyes = EYES_RIGHT;
 208                 _queue.push_back (qi);
 209         } else {
 210                 qi.eyes = eyes;
 211                 _queue.push_back (qi);
 212         }
 213
 214         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 215         _empty_condition.notify_all ();
 216 }
 217
 218 /** This method is not thread safe */
 219 void
 220 Writer::write (shared_ptr<const AudioBuffers> audio)
 221 {
 222         if (_sound_mxf_writer) {
 223                 _sound_mxf_writer->write (audio->data(), audio->frames());
 224         }
 225 }
 226
 227 /** This must be called from Writer::thread() with an appropriate lock held */
 228 bool
 229 Writer::have_sequenced_image_at_queue_head ()
 230 {
 231         if (_queue.empty ()) {
 232                 return false;
 233         }
 234
 235         _queue.sort ();
 236
 237         /* The queue should contain only EYES_LEFT/EYES_RIGHT pairs or EYES_BOTH */
 238
 239         if (_queue.front().eyes == EYES_BOTH) {
 240                 /* 2D */
 241                 return _queue.front().frame == (_last_written_frame + 1);
 242         }
 243
 244         /* 3D */
 245
 246         if (_last_written_eyes == EYES_LEFT && _queue.front().frame == _last_written_frame && _queue.front().eyes == EYES_RIGHT) {
 247                 return true;
 248         }
 249
 250         if (_last_written_eyes == EYES_RIGHT && _queue.front().frame == (_last_written_frame + 1) && _queue.front().eyes == EYES_LEFT) {
 251                 return true;
 252         }
 253
 254         return false;
 255 }
 256
 257 void
 258 Writer::thread ()
 259 try
 260 {
 261         while (true)
 262         {
 263                 boost::mutex::scoped_lock lock (_mutex);
 264
 265                 /* This is for debugging only */
 266                 bool done_something = false;
 267
 268                 while (true) {
 269
 270                         if (_finish || _queued_full_in_memory > maximum_frames_in_memory () || have_sequenced_image_at_queue_head ()) {
 271                                 /* We've got something to do: go and do it */
 272                                 break;
 273                         }
 274
 275                         /* Nothing to do: wait until something happens which may indicate that we do */
 276                         LOG_TIMING (N_("writer sleeps with a queue of %1"), _queue.size());
 277                         _empty_condition.wait (lock);
 278                         LOG_TIMING (N_("writer wakes with a queue of %1"), _queue.size());
 279                 }
 280
 281                 if (_finish && _queue.empty()) {
 282                         return;
 283                 }
 284
 285                 /* We stop here if we have been asked to finish, and if either the queue
 286                    is empty or we do not have a sequenced image at its head (if this is the
 287                    case we will never terminate as no new frames will be sent once
 288                    _finish is true).
 289                 */
 290                 if (_finish && (!have_sequenced_image_at_queue_head() || _queue.empty())) {
 291                         done_something = true;
 292                         /* (Hopefully temporarily) log anything that was not written */
 293                         if (!_queue.empty() && !have_sequenced_image_at_queue_head()) {
 294                                 LOG_WARNING (N_("Finishing writer with a left-over queue of %1:"), _queue.size());
 295                                 for (list<QueueItem>::const_iterator i = _queue.begin(); i != _queue.end(); ++i) {
 296                                         if (i->type == QueueItem::FULL) {
 297                                                 LOG_WARNING (N_("- type FULL, frame %1, eyes %2"), i->frame, i->eyes);
 298                                         } else {
 299                                                 LOG_WARNING (N_("- type FAKE, size %1, frame %2, eyes %3"), i->size, i->frame, i->eyes);
 300                                         }
 301                                 }
 302                                 LOG_WARNING (N_("Last written frame %1, last written eyes %2"), _last_written_frame, _last_written_eyes);
 303                         }
 304                         return;
 305                 }
 306                 /* Write any frames that we can write; i.e. those that are in sequence. */
 307                 while (have_sequenced_image_at_queue_head ()) {
 308                         done_something = true;
 309                         QueueItem qi = _queue.front ();
 310                         _queue.pop_front ();
 311                         if (qi.type == QueueItem::FULL && qi.encoded) {
 312                                 --_queued_full_in_memory;
 313                         }
 314
 315                         lock.unlock ();
 316                         switch (qi.type) {
 317                         case QueueItem::FULL:
 318                         {
 319                                 LOG_GENERAL (N_("Writer FULL-writes %1 to MXF"), qi.frame);
 320                                 if (!qi.encoded) {
 321                                         qi.encoded.reset (new EncodedData (_film->j2c_path (qi.frame, qi.eyes, false)));
 322                                 }
 323
 324                                 dcp::FrameInfo fin = _picture_mxf_writer->write (qi.encoded->data(), qi.encoded->size());
 325                                 qi.encoded->write_info (_film, qi.frame, qi.eyes, fin);
 326                                 _last_written[qi.eyes] = qi.encoded;
 327                                 ++_full_written;
 328                                 break;
 329                         }
 330                         case QueueItem::FAKE:
 331                                 LOG_GENERAL (N_("Writer FAKE-writes %1 to MXF"), qi.frame);
 332                                 _picture_mxf_writer->fake_write (qi.size);
 333                                 _last_written[qi.eyes].reset ();
 334                                 ++_fake_written;
 335                                 break;
 336                         }
 337                         lock.lock ();
 338
 339                         _last_written_frame = qi.frame;
 340                         _last_written_eyes = qi.eyes;
 341
 342                         shared_ptr<Job> job = _job.lock ();
 343                         DCPOMATIC_ASSERT (job);
 344                         int64_t total = _film->length().frames (_film->video_frame_rate ());
 345                         if (_film->three_d ()) {
 346                                 /* _full_written and so on are incremented for each eye, so we need to double the total
 347                                    frames to get the correct progress.
 348                                 */
 349                                 total *= 2;
 350                         }
 351                         if (total) {
 352                                 job->set_progress (float (_full_written + _fake_written) / total);
 353                         }
 354                 }
 355
 356                 while (_queued_full_in_memory > maximum_frames_in_memory ()) {
 357                         done_something = true;
 358                         /* Too many frames in memory which can't yet be written to the stream.
 359                            Write some FULL frames to disk.
 360                         */
 361
 362                         /* Find one from the back of the queue */
 363                         _queue.sort ();
 364                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 365                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 366                                 ++i;
 367                         }
 368
 369                         DCPOMATIC_ASSERT (i != _queue.rend());
 370                         ++_pushed_to_disk;
 371                         lock.unlock ();
 372
 373                         /* i is valid here, even though we don't hold a lock on the mutex,
 374                            since list iterators are unaffected by insertion and only this
 375                            thread could erase the last item in the list.
 376                         */
 377
 378                         LOG_GENERAL (
 379                                 "Writer full (awaiting %1 [last eye was %2]); pushes %3 to disk",
 380                                 _last_written_frame + 1,
 381                                 _last_written_eyes, i->frame
 382                                 );
 383
 384                         i->encoded->write (_film, i->frame, i->eyes);
 385
 386                         lock.lock ();
 387                         i->encoded.reset ();
 388                         --_queued_full_in_memory;
 389                 }
 390
 391                 if (!done_something) {
 392                         LOG_DEBUG_NC ("Writer loop ran without doing anything");
 393                         LOG_DEBUG ("_queued_full_in_memory=%1", _queued_full_in_memory);
 394                         LOG_DEBUG ("_queue_size=%1", _queue.size ());
 395                         LOG_DEBUG ("_finish=%1", _finish);
 396                         LOG_DEBUG ("_last_written_frame=%1", _last_written_frame);
 397                 }
 398
 399                 /* The queue has probably just gone down a bit; notify anything wait()ing on _full_condition */
 400                 _full_condition.notify_all ();
 401         }
 402 }
 403 catch (...)
 404 {
 405         store_current ();
 406 }
 407
 408 void
 409 Writer::terminate_thread (bool can_throw)
 410 {
 411         boost::mutex::scoped_lock lock (_mutex);
 412         if (_thread == 0) {
 413                 return;
 414         }
 415
 416         _finish = true;
 417         _empty_condition.notify_all ();
 418         _full_condition.notify_all ();
 419         lock.unlock ();
 420
 421         _thread->join ();
 422         if (can_throw) {
 423                 rethrow ();
 424         }
 425
 426         delete _thread;
 427         _thread = 0;
 428 }
 429
 430 void
 431 Writer::finish ()
 432 {
 433         if (!_thread) {
 434                 return;
 435         }
 436
 437         terminate_thread (true);
 438
 439         _picture_mxf_writer->finalize ();
 440         if (_sound_mxf_writer) {
 441                 _sound_mxf_writer->finalize ();
 442         }
 443
 444         /* Hard-link the video MXF into the DCP */
 445         boost::filesystem::path video_from = _picture_mxf->file ();
 446
 447         boost::filesystem::path video_to;
 448         video_to /= _film->dir (_film->dcp_name());
 449         video_to /= video_mxf_filename (_picture_mxf);
 450
 451         boost::system::error_code ec;
 452         boost::filesystem::create_hard_link (video_from, video_to, ec);
 453         if (ec) {
 454                 LOG_WARNING_NC ("Hard-link failed; copying instead");
 455                 boost::filesystem::copy_file (video_from, video_to, ec);
 456                 if (ec) {
 457                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 458                         throw FileError (ec.message(), video_from);
 459                 }
 460         }
 461
 462         _picture_mxf->set_file (video_to);
 463
 464         /* Move the audio MXF into the DCP */
 465
 466         if (_sound_mxf) {
 467                 boost::filesystem::path audio_to;
 468                 audio_to /= _film->dir (_film->dcp_name ());
 469                 audio_to /= audio_mxf_filename (_sound_mxf);
 470
 471                 boost::filesystem::rename (_film->file (audio_mxf_filename (_sound_mxf)), audio_to, ec);
 472                 if (ec) {
 473                         throw FileError (
 474                                 String::compose (_("could not move audio MXF into the DCP (%1)"), ec.value ()), audio_mxf_filename (_sound_mxf)
 475                                 );
 476                 }
 477
 478                 _sound_mxf->set_file (audio_to);
 479         }
 480
 481         dcp::DCP dcp (_film->dir (_film->dcp_name()));
 482
 483         shared_ptr<dcp::CPL> cpl (
 484                 new dcp::CPL (
 485                         _film->dcp_name(),
 486                         _film->dcp_content_type()->libdcp_kind ()
 487                         )
 488                 );
 489
 490         dcp.add (cpl);
 491
 492         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 493
 494         shared_ptr<dcp::MonoPictureMXF> mono = dynamic_pointer_cast<dcp::MonoPictureMXF> (_picture_mxf);
 495         if (mono) {
 496                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelMonoPictureAsset (mono, 0)));
 497                 dcp.add (mono);
 498         }
 499
 500         shared_ptr<dcp::StereoPictureMXF> stereo = dynamic_pointer_cast<dcp::StereoPictureMXF> (_picture_mxf);
 501         if (stereo) {
 502                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelStereoPictureAsset (stereo, 0)));
 503                 dcp.add (stereo);
 504         }
 505
 506         if (_sound_mxf) {
 507                 reel->add (shared_ptr<dcp::ReelSoundAsset> (new dcp::ReelSoundAsset (_sound_mxf, 0)));
 508                 dcp.add (_sound_mxf);
 509         }
 510
 511         if (_subtitle_content) {
 512                 boost::filesystem::path const liberation = shared_path () / "LiberationSans-Regular.ttf";
 513
 514                 /* Add all the fonts to the subtitle content and as assets to the DCP */
 515                 BOOST_FOREACH (shared_ptr<Font> i, _fonts) {
 516                         boost::filesystem::path const from = i->file.get_value_or (liberation);
 517                         _subtitle_content->add_font (i->id, from.leaf().string ());
 518
 519                         boost::filesystem::path to = _film->dir (_film->dcp_name ()) / _subtitle_content->id ();
 520                         boost::filesystem::create_directories (to, ec);
 521                         if (ec) {
 522                                 throw FileError (_("Could not create directory"), to);
 523                         }
 524
 525                         to /= from.leaf();
 526
 527                         boost::system::error_code ec;
 528                         boost::filesystem::copy_file (from, to, ec);
 529                         if (ec) {
 530                                 throw FileError ("Could not copy font to DCP", from);
 531                         }
 532
 533                         dcp.add (shared_ptr<dcp::Font> (new dcp::Font (to)));
 534                 }
 535
 536                 _subtitle_content->write_xml (_film->dir (_film->dcp_name ()) / _subtitle_content->id () / subtitle_content_filename (_subtitle_content));
 537                 reel->add (shared_ptr<dcp::ReelSubtitleAsset> (
 538                                    new dcp::ReelSubtitleAsset (
 539                                            _subtitle_content,
 540                                            dcp::Fraction (_film->video_frame_rate(), 1),
 541                                            _picture_mxf->intrinsic_duration (),
 542                                            0
 543                                            )
 544                                    ));
 545
 546                 dcp.add (_subtitle_content);
 547         }
 548
 549         cpl->add (reel);
 550
 551         shared_ptr<Job> job = _job.lock ();
 552         DCPOMATIC_ASSERT (job);
 553
 554         job->sub (_("Computing image digest"));
 555         _picture_mxf->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 556
 557         if (_sound_mxf) {
 558                 job->sub (_("Computing audio digest"));
 559                 _sound_mxf->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 560         }
 561
 562         dcp::XMLMetadata meta;
 563         meta.issuer = Config::instance()->dcp_issuer ();
 564         meta.creator = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 565         meta.set_issue_date_now ();
 566
 567         shared_ptr<const dcp::Signer> signer;
 568         if (_film->is_signed ()) {
 569                 signer = Config::instance()->signer ();
 570                 /* We did check earlier, but check again here to be on the safe side */
 571                 if (!signer->valid ()) {
 572                         throw InvalidSignerError ();
 573                 }
 574         }
 575
 576         dcp.write_xml (_film->interop () ? dcp::INTEROP : dcp::SMPTE, meta, signer);
 577
 578         LOG_GENERAL (
 579                 N_("Wrote %1 FULL, %2 FAKE, %3 pushed to disk"), _full_written, _fake_written, _pushed_to_disk
 580                 );
 581 }
 582
 583 bool
 584 Writer::check_existing_picture_mxf_frame (FILE* mxf, int f, Eyes eyes)
 585 {
 586         /* Read the frame info as written */
 587         FILE* file = fopen_boost (_film->info_file (), "rb");
 588         if (!file) {
 589                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 590                 return false;
 591         }
 592
 593         dcp::FrameInfo info = read_frame_info (file, f, eyes);
 594         fclose (file);
 595         if (info.size == 0) {
 596                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 597                 return false;
 598         }
 599
 600         /* Read the data from the MXF and hash it */
 601         dcpomatic_fseek (mxf, info.offset, SEEK_SET);
 602         EncodedData data (info.size);
 603         size_t const read = fread (data.data(), 1, data.size(), mxf);
 604         if (read != static_cast<size_t> (data.size ())) {
 605                 LOG_GENERAL ("Existing frame %1 is incomplete", f);
 606                 return false;
 607         }
 608
 609         MD5Digester digester;
 610         digester.add (data.data(), data.size());
 611         if (digester.get() != info.hash) {
 612                 LOG_GENERAL ("Existing frame %1 failed hash check", f);
 613                 return false;
 614         }
 615
 616         return true;
 617 }
 618
 619 void
 620 Writer::check_existing_picture_mxf ()
 621 {
 622         /* Try to open the existing MXF */
 623         FILE* mxf = fopen_boost (_picture_mxf->file(), "rb");
 624         if (!mxf) {
 625                 LOG_GENERAL ("Could not open existing MXF at %1 (errno=%2)", _picture_mxf->file().string(), errno);
 626                 return;
 627         }
 628
 629         while (true) {
 630
 631                 shared_ptr<Job> job = _job.lock ();
 632                 DCPOMATIC_ASSERT (job);
 633
 634                 job->set_progress_unknown ();
 635
 636                 if (_film->three_d ()) {
 637                         if (!check_existing_picture_mxf_frame (mxf, _first_nonexistant_frame, EYES_LEFT)) {
 638                                 break;
 639                         }
 640                         if (!check_existing_picture_mxf_frame (mxf, _first_nonexistant_frame, EYES_RIGHT)) {
 641                                 break;
 642                         }
 643                 } else {
 644                         if (!check_existing_picture_mxf_frame (mxf, _first_nonexistant_frame, EYES_BOTH)) {
 645                                 break;
 646                         }
 647                 }
 648
 649                 LOG_GENERAL ("Have existing frame %1", _first_nonexistant_frame);
 650                 ++_first_nonexistant_frame;
 651         }
 652
 653         fclose (mxf);
 654 }
 655
 656 /** @param frame Frame index.
 657  *  @return true if we can fake-write this frame.
 658  */
 659 bool
 660 Writer::can_fake_write (int frame) const
 661 {
 662         /* We have to do a proper write of the first frame so that we can set up the JPEG2000
 663            parameters in the MXF writer.
 664         */
 665         return (frame != 0 && frame < _first_nonexistant_frame);
 666 }
 667
 668 void
 669 Writer::write (PlayerSubtitles subs)
 670 {
 671         if (subs.text.empty ()) {
 672                 return;
 673         }
 674
 675         if (!_subtitle_content) {
 676                 string lang = _film->subtitle_language ();
 677                 if (lang.empty ()) {
 678                         lang = "Unknown";
 679                 }
 680                 _subtitle_content.reset (new dcp::InteropSubtitleContent (_film->name(), lang));
 681         }
 682
 683         for (list<dcp::SubtitleString>::const_iterator i = subs.text.begin(); i != subs.text.end(); ++i) {
 684                 _subtitle_content->add (*i);
 685         }
 686 }
 687
 688 void
 689 Writer::write (list<shared_ptr<Font> > fonts)
 690 {
 691         /* Just keep a list of fonts and we'll deal with them in ::finish */
 692         copy (fonts.begin (), fonts.end (), back_inserter (_fonts));
 693 }
 694
 695 bool
 696 operator< (QueueItem const & a, QueueItem const & b)
 697 {
 698         if (a.frame != b.frame) {
 699                 return a.frame < b.frame;
 700         }
 701
 702         return static_cast<int> (a.eyes) < static_cast<int> (b.eyes);
 703 }
 704
 705 bool
 706 operator== (QueueItem const & a, QueueItem const & b)
 707 {
 708         return a.frame == b.frame && a.eyes == b.eyes;
 709 }
 710
 711 int
 712 Writer::maximum_frames_in_memory () const
 713 {
 714         return Config::instance()->num_local_encoding_threads() + 4;
 715 }