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