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