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_asset.h>
  38 #include <dcp/stereo_picture_asset.h>
  39 #include <dcp/sound_asset.h>
  40 #include <dcp/sound_asset_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_asset.h>
  50 #include <dcp/smpte_subtitle_asset.h>
  51 #include <dcp/font.h>
  52 #include <boost/foreach.hpp>
  53 #include <fstream>
  54 #include <cerrno>
  55
  56 #include "i18n.h"
  57
  58 #define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
  59 #define LOG_TIMING(...) _film->log()->microsecond_log (String::compose (__VA_ARGS__), Log::TYPE_TIMING);
  60 #define LOG_WARNING_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_WARNING);
  61 #define LOG_WARNING(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_WARNING);
  62 #define LOG_ERROR(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_ERROR);
  63 #define LOG_DEBUG(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_DEBUG);
  64 #define LOG_DEBUG_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_DEBUG);
  65
  66 /* OS X strikes again */
  67 #undef set_key
  68
  69 using std::make_pair;
  70 using std::pair;
  71 using std::string;
  72 using std::list;
  73 using std::cout;
  74 using boost::shared_ptr;
  75 using boost::weak_ptr;
  76 using boost::dynamic_pointer_cast;
  77
  78 Writer::Writer (shared_ptr<const Film> f, weak_ptr<Job> j)
  79         : _film (f)
  80         , _job (j)
  81         , _first_nonexistant_frame (0)
  82         , _thread (0)
  83         , _finish (false)
  84         , _queued_full_in_memory (0)
  85         , _last_written_frame (-1)
  86         , _last_written_eyes (EYES_RIGHT)
  87         , _maximum_frames_in_memory (0)
  88         , _full_written (0)
  89         , _fake_written (0)
  90         , _pushed_to_disk (0)
  91 {
  92         /* Remove any old DCP */
  93         boost::filesystem::remove_all (_film->dir (_film->dcp_name ()));
  94
  95         shared_ptr<Job> job = _job.lock ();
  96         DCPOMATIC_ASSERT (job);
  97
  98         /* Create our picture asset in a subdirectory, named according to those
  99            film's parameters which affect the video output.  We will hard-link
 100            it into the DCP later.
 101         */
 102
 103         if (_film->three_d ()) {
 104                 _picture_asset.reset (new dcp::StereoPictureAsset (dcp::Fraction (_film->video_frame_rate (), 1)));
 105         } else {
 106                 _picture_asset.reset (new dcp::MonoPictureAsset (dcp::Fraction (_film->video_frame_rate (), 1)));
 107         }
 108
 109         _picture_asset->set_size (_film->frame_size ());
 110
 111         if (_film->encrypted ()) {
 112                 _picture_asset->set_key (_film->key ());
 113         }
 114
 115         _picture_asset->set_file (
 116                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename()
 117                 );
 118
 119         job->sub (_("Checking existing image data"));
 120         check_existing_picture_asset ();
 121
 122         _picture_asset_writer = _picture_asset->start_write (
 123                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(),
 124                 _film->interop() ? dcp::INTEROP : dcp::SMPTE,
 125                 _first_nonexistant_frame > 0
 126                 );
 127
 128         if (_film->audio_channels ()) {
 129                 _sound_asset.reset (
 130                         new dcp::SoundAsset (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels ())
 131                         );
 132
 133                 if (_film->encrypted ()) {
 134                         _sound_asset->set_key (_film->key ());
 135                 }
 136
 137                 /* Write the sound asset into the film directory so that we leave the creation
 138                    of the DCP directory until the last minute.
 139                 */
 140                 _sound_asset_writer = _sound_asset->start_write (
 141                         _film->directory() / audio_asset_filename (_sound_asset),
 142                         _film->interop() ? dcp::INTEROP : dcp::SMPTE
 143                         );
 144         }
 145
 146         /* Check that the signer is OK if we need one */
 147         if (_film->is_signed() && !Config::instance()->signer()->valid ()) {
 148                 throw InvalidSignerError ();
 149         }
 150
 151         _thread = new boost::thread (boost::bind (&Writer::thread, this));
 152
 153         job->sub (_("Encoding image data"));
 154 }
 155
 156 Writer::~Writer ()
 157 {
 158         terminate_thread (false);
 159 }
 160
 161 void
 162 Writer::write (shared_ptr<const EncodedData> encoded, int frame, Eyes eyes)
 163 {
 164         boost::mutex::scoped_lock lock (_mutex);
 165
 166         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 167                 /* The queue is too big; wait until that is sorted out */
 168                 _full_condition.wait (lock);
 169         }
 170
 171         QueueItem qi;
 172         qi.type = QueueItem::FULL;
 173         qi.encoded = encoded;
 174         qi.frame = frame;
 175
 176         if (_film->three_d() && eyes == EYES_BOTH) {
 177                 /* 2D material in a 3D DCP; fake the 3D */
 178                 qi.eyes = EYES_LEFT;
 179                 _queue.push_back (qi);
 180                 ++_queued_full_in_memory;
 181                 qi.eyes = EYES_RIGHT;
 182                 _queue.push_back (qi);
 183                 ++_queued_full_in_memory;
 184         } else {
 185                 qi.eyes = eyes;
 186                 _queue.push_back (qi);
 187                 ++_queued_full_in_memory;
 188         }
 189
 190         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 191         _empty_condition.notify_all ();
 192 }
 193
 194 void
 195 Writer::fake_write (int frame, Eyes eyes)
 196 {
 197         boost::mutex::scoped_lock lock (_mutex);
 198
 199         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 200                 /* The queue is too big; wait until that is sorted out */
 201                 _full_condition.wait (lock);
 202         }
 203
 204         FILE* file = fopen_boost (_film->info_file (), "rb");
 205         if (!file) {
 206                 throw ReadFileError (_film->info_file ());
 207         }
 208         dcp::FrameInfo info = read_frame_info (file, frame, eyes);
 209         fclose (file);
 210
 211         QueueItem qi;
 212         qi.type = QueueItem::FAKE;
 213         qi.size = info.size;
 214         qi.frame = frame;
 215         if (_film->three_d() && eyes == EYES_BOTH) {
 216                 qi.eyes = EYES_LEFT;
 217                 _queue.push_back (qi);
 218                 qi.eyes = EYES_RIGHT;
 219                 _queue.push_back (qi);
 220         } else {
 221                 qi.eyes = eyes;
 222                 _queue.push_back (qi);
 223         }
 224
 225         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 226         _empty_condition.notify_all ();
 227 }
 228
 229 /** This method is not thread safe */
 230 void
 231 Writer::write (shared_ptr<const AudioBuffers> audio)
 232 {
 233         if (_sound_asset_writer) {
 234                 _sound_asset_writer->write (audio->data(), audio->frames());
 235         }
 236 }
 237
 238 /** This must be called from Writer::thread() with an appropriate lock held */
 239 bool
 240 Writer::have_sequenced_image_at_queue_head ()
 241 {
 242         if (_queue.empty ()) {
 243                 return false;
 244         }
 245
 246         _queue.sort ();
 247
 248         /* The queue should contain only EYES_LEFT/EYES_RIGHT pairs or EYES_BOTH */
 249
 250         if (_queue.front().eyes == EYES_BOTH) {
 251                 /* 2D */
 252                 return _queue.front().frame == (_last_written_frame + 1);
 253         }
 254
 255         /* 3D */
 256
 257         if (_last_written_eyes == EYES_LEFT && _queue.front().frame == _last_written_frame && _queue.front().eyes == EYES_RIGHT) {
 258                 return true;
 259         }
 260
 261         if (_last_written_eyes == EYES_RIGHT && _queue.front().frame == (_last_written_frame + 1) && _queue.front().eyes == EYES_LEFT) {
 262                 return true;
 263         }
 264
 265         return false;
 266 }
 267
 268 void
 269 Writer::thread ()
 270 try
 271 {
 272         while (true)
 273         {
 274                 boost::mutex::scoped_lock lock (_mutex);
 275
 276                 /* This is for debugging only */
 277                 bool done_something = false;
 278
 279                 while (true) {
 280
 281                         if (_finish || _queued_full_in_memory > _maximum_frames_in_memory || have_sequenced_image_at_queue_head ()) {
 282                                 /* We've got something to do: go and do it */
 283                                 break;
 284                         }
 285
 286                         /* Nothing to do: wait until something happens which may indicate that we do */
 287                         LOG_TIMING (N_("writer sleeps with a queue of %1"), _queue.size());
 288                         _empty_condition.wait (lock);
 289                         LOG_TIMING (N_("writer wakes with a queue of %1"), _queue.size());
 290                 }
 291
 292                 if (_finish && _queue.empty()) {
 293                         return;
 294                 }
 295
 296                 /* We stop here if we have been asked to finish, and if either the queue
 297                    is empty or we do not have a sequenced image at its head (if this is the
 298                    case we will never terminate as no new frames will be sent once
 299                    _finish is true).
 300                 */
 301                 if (_finish && (!have_sequenced_image_at_queue_head() || _queue.empty())) {
 302                         done_something = true;
 303                         /* (Hopefully temporarily) log anything that was not written */
 304                         if (!_queue.empty() && !have_sequenced_image_at_queue_head()) {
 305                                 LOG_WARNING (N_("Finishing writer with a left-over queue of %1:"), _queue.size());
 306                                 for (list<QueueItem>::const_iterator i = _queue.begin(); i != _queue.end(); ++i) {
 307                                         if (i->type == QueueItem::FULL) {
 308                                                 LOG_WARNING (N_("- type FULL, frame %1, eyes %2"), i->frame, i->eyes);
 309                                         } else {
 310                                                 LOG_WARNING (N_("- type FAKE, size %1, frame %2, eyes %3"), i->size, i->frame, i->eyes);
 311                                         }
 312                                 }
 313                                 LOG_WARNING (N_("Last written frame %1, last written eyes %2"), _last_written_frame, _last_written_eyes);
 314                         }
 315                         return;
 316                 }
 317                 /* Write any frames that we can write; i.e. those that are in sequence. */
 318                 while (have_sequenced_image_at_queue_head ()) {
 319                         done_something = true;
 320                         QueueItem qi = _queue.front ();
 321                         _queue.pop_front ();
 322                         if (qi.type == QueueItem::FULL && qi.encoded) {
 323                                 --_queued_full_in_memory;
 324                         }
 325
 326                         lock.unlock ();
 327                         switch (qi.type) {
 328                         case QueueItem::FULL:
 329                         {
 330                                 LOG_GENERAL (N_("Writer FULL-writes %1 (%2)"), qi.frame, qi.eyes);
 331                                 if (!qi.encoded) {
 332                                         qi.encoded.reset (new EncodedData (_film->j2c_path (qi.frame, qi.eyes, false)));
 333                                 }
 334
 335                                 dcp::FrameInfo fin = _picture_asset_writer->write (qi.encoded->data(), qi.encoded->size());
 336                                 qi.encoded->write_info (_film, qi.frame, qi.eyes, fin);
 337                                 _last_written[qi.eyes] = qi.encoded;
 338                                 ++_full_written;
 339                                 break;
 340                         }
 341                         case QueueItem::FAKE:
 342                                 LOG_GENERAL (N_("Writer FAKE-writes %1"), qi.frame);
 343                                 _picture_asset_writer->fake_write (qi.size);
 344                                 _last_written[qi.eyes].reset ();
 345                                 ++_fake_written;
 346                                 break;
 347                         }
 348                         lock.lock ();
 349
 350                         _last_written_frame = qi.frame;
 351                         _last_written_eyes = qi.eyes;
 352
 353                         shared_ptr<Job> job = _job.lock ();
 354                         DCPOMATIC_ASSERT (job);
 355                         int64_t total = _film->length().frames (_film->video_frame_rate ());
 356                         if (_film->three_d ()) {
 357                                 /* _full_written and so on are incremented for each eye, so we need to double the total
 358                                    frames to get the correct progress.
 359                                 */
 360                                 total *= 2;
 361                         }
 362                         if (total) {
 363                                 job->set_progress (float (_full_written + _fake_written) / total);
 364                         }
 365                 }
 366
 367                 while (_queued_full_in_memory > _maximum_frames_in_memory) {
 368                         done_something = true;
 369                         /* Too many frames in memory which can't yet be written to the stream.
 370                            Write some FULL frames to disk.
 371                         */
 372
 373                         /* Find one from the back of the queue */
 374                         _queue.sort ();
 375                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 376                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 377                                 ++i;
 378                         }
 379
 380                         DCPOMATIC_ASSERT (i != _queue.rend());
 381                         ++_pushed_to_disk;
 382                         lock.unlock ();
 383
 384                         /* i is valid here, even though we don't hold a lock on the mutex,
 385                            since list iterators are unaffected by insertion and only this
 386                            thread could erase the last item in the list.
 387                         */
 388
 389                         LOG_GENERAL (
 390                                 "Writer full (awaiting %1 [last eye was %2]); pushes %3 to disk",
 391                                 _last_written_frame + 1,
 392                                 _last_written_eyes, i->frame
 393                                 );
 394
 395                         i->encoded->write (_film, i->frame, i->eyes);
 396
 397                         lock.lock ();
 398                         i->encoded.reset ();
 399                         --_queued_full_in_memory;
 400                 }
 401
 402                 if (!done_something) {
 403                         LOG_DEBUG_NC ("Writer loop ran without doing anything");
 404                         LOG_DEBUG ("_queued_full_in_memory=%1", _queued_full_in_memory);
 405                         LOG_DEBUG ("_queue_size=%1", _queue.size ());
 406                         LOG_DEBUG ("_finish=%1", _finish);
 407                         LOG_DEBUG ("_last_written_frame=%1", _last_written_frame);
 408                 }
 409
 410                 /* The queue has probably just gone down a bit; notify anything wait()ing on _full_condition */
 411                 _full_condition.notify_all ();
 412         }
 413 }
 414 catch (...)
 415 {
 416         store_current ();
 417 }
 418
 419 void
 420 Writer::terminate_thread (bool can_throw)
 421 {
 422         boost::mutex::scoped_lock lock (_mutex);
 423         if (_thread == 0) {
 424                 return;
 425         }
 426
 427         _finish = true;
 428         _empty_condition.notify_all ();
 429         _full_condition.notify_all ();
 430         lock.unlock ();
 431
 432         _thread->join ();
 433         if (can_throw) {
 434                 rethrow ();
 435         }
 436
 437         delete _thread;
 438         _thread = 0;
 439 }
 440
 441 void
 442 Writer::finish ()
 443 {
 444         if (!_thread) {
 445                 return;
 446         }
 447
 448         terminate_thread (true);
 449
 450         _picture_asset_writer->finalize ();
 451         if (_sound_asset_writer) {
 452                 _sound_asset_writer->finalize ();
 453         }
 454
 455         /* Hard-link the video asset into the DCP */
 456         boost::filesystem::path video_from = _picture_asset->file ();
 457
 458         boost::filesystem::path video_to;
 459         video_to /= _film->dir (_film->dcp_name());
 460         video_to /= video_asset_filename (_picture_asset);
 461
 462         boost::system::error_code ec;
 463         boost::filesystem::create_hard_link (video_from, video_to, ec);
 464         if (ec) {
 465                 LOG_WARNING_NC ("Hard-link failed; copying instead");
 466                 boost::filesystem::copy_file (video_from, video_to, ec);
 467                 if (ec) {
 468                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 469                         throw FileError (ec.message(), video_from);
 470                 }
 471         }
 472
 473         _picture_asset->set_file (video_to);
 474
 475         /* Move the audio asset into the DCP */
 476
 477         if (_sound_asset) {
 478                 boost::filesystem::path audio_to;
 479                 audio_to /= _film->dir (_film->dcp_name ());
 480                 audio_to /= audio_asset_filename (_sound_asset);
 481
 482                 boost::filesystem::rename (_film->file (audio_asset_filename (_sound_asset)), audio_to, ec);
 483                 if (ec) {
 484                         throw FileError (
 485                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), audio_asset_filename (_sound_asset)
 486                                 );
 487                 }
 488
 489                 _sound_asset->set_file (audio_to);
 490         }
 491
 492         dcp::DCP dcp (_film->dir (_film->dcp_name()));
 493
 494         shared_ptr<dcp::CPL> cpl (
 495                 new dcp::CPL (
 496                         _film->dcp_name(),
 497                         _film->dcp_content_type()->libdcp_kind ()
 498                         )
 499                 );
 500
 501         dcp.add (cpl);
 502
 503         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 504
 505         shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 506         if (mono) {
 507                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelMonoPictureAsset (mono, 0)));
 508                 dcp.add (mono);
 509         }
 510
 511         shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 512         if (stereo) {
 513                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelStereoPictureAsset (stereo, 0)));
 514                 dcp.add (stereo);
 515         }
 516
 517         if (_sound_asset) {
 518                 reel->add (shared_ptr<dcp::ReelSoundAsset> (new dcp::ReelSoundAsset (_sound_asset, 0)));
 519                 dcp.add (_sound_asset);
 520         }
 521
 522         if (_subtitle_asset) {
 523                 boost::filesystem::path const liberation = shared_path () / "LiberationSans-Regular.ttf";
 524
 525                 /* Add all the fonts to the subtitle content and as assets to the DCP */
 526                 BOOST_FOREACH (shared_ptr<Font> i, _fonts) {
 527                         boost::filesystem::path const from = i->file.get_value_or (liberation);
 528                         _subtitle_asset->add_font (i->id, from.leaf().string ());
 529
 530                         boost::filesystem::path to = _film->dir (_film->dcp_name ()) / _subtitle_asset->id ();
 531                         boost::filesystem::create_directories (to, ec);
 532                         if (ec) {
 533                                 throw FileError (_("Could not create directory"), to);
 534                         }
 535
 536                         to /= from.leaf();
 537
 538                         boost::system::error_code ec;
 539                         boost::filesystem::copy_file (from, to, ec);
 540                         if (ec) {
 541                                 throw FileError ("Could not copy font to DCP", from);
 542                         }
 543
 544                         dcp.add (shared_ptr<dcp::Font> (new dcp::Font (to)));
 545                 }
 546
 547                 _subtitle_asset->write (
 548                         _film->dir (_film->dcp_name ()) / _subtitle_asset->id () / subtitle_content_filename (_subtitle_asset)
 549                         );
 550
 551                 reel->add (shared_ptr<dcp::ReelSubtitleAsset> (
 552                                    new dcp::ReelSubtitleAsset (
 553                                            _subtitle_asset,
 554                                            dcp::Fraction (_film->video_frame_rate(), 1),
 555                                            _picture_asset->intrinsic_duration (),
 556                                            0
 557                                            )
 558                                    ));
 559
 560                 dcp.add (_subtitle_asset);
 561         }
 562
 563         cpl->add (reel);
 564
 565         shared_ptr<Job> job = _job.lock ();
 566         DCPOMATIC_ASSERT (job);
 567
 568         job->sub (_("Computing image digest"));
 569         _picture_asset->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 570
 571         if (_sound_asset) {
 572                 job->sub (_("Computing audio digest"));
 573                 _sound_asset->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 574         }
 575
 576         dcp::XMLMetadata meta;
 577         meta.issuer = Config::instance()->dcp_issuer ();
 578         meta.creator = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 579         meta.set_issue_date_now ();
 580
 581         shared_ptr<const dcp::Signer> signer;
 582         if (_film->is_signed ()) {
 583                 signer = Config::instance()->signer ();
 584                 /* We did check earlier, but check again here to be on the safe side */
 585                 if (!signer->valid ()) {
 586                         throw InvalidSignerError ();
 587                 }
 588         }
 589
 590         dcp.write_xml (_film->interop () ? dcp::INTEROP : dcp::SMPTE, meta, signer);
 591
 592         LOG_GENERAL (
 593                 N_("Wrote %1 FULL, %2 FAKE, %3 pushed to disk"), _full_written, _fake_written, _pushed_to_disk
 594                 );
 595 }
 596
 597 bool
 598 Writer::check_existing_picture_asset_frame (FILE* asset, int f, Eyes eyes)
 599 {
 600         /* Read the frame info as written */
 601         FILE* file = fopen_boost (_film->info_file (), "rb");
 602         if (!file) {
 603                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 604                 return false;
 605         }
 606
 607         dcp::FrameInfo info = read_frame_info (file, f, eyes);
 608         fclose (file);
 609         if (info.size == 0) {
 610                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 611                 return false;
 612         }
 613
 614         /* Read the data from the asset and hash it */
 615         dcpomatic_fseek (asset, info.offset, SEEK_SET);
 616         EncodedData data (info.size);
 617         size_t const read = fread (data.data(), 1, data.size(), asset);
 618         if (read != static_cast<size_t> (data.size ())) {
 619                 LOG_GENERAL ("Existing frame %1 is incomplete", f);
 620                 return false;
 621         }
 622
 623         MD5Digester digester;
 624         digester.add (data.data(), data.size());
 625         if (digester.get() != info.hash) {
 626                 LOG_GENERAL ("Existing frame %1 failed hash check", f);
 627                 return false;
 628         }
 629
 630         return true;
 631 }
 632
 633 void
 634 Writer::check_existing_picture_asset ()
 635 {
 636         /* Try to open the existing asset */
 637         FILE* asset = fopen_boost (_picture_asset->file(), "rb");
 638         if (!asset) {
 639                 LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", _picture_asset->file().string(), errno);
 640                 return;
 641         }
 642
 643         while (true) {
 644
 645                 shared_ptr<Job> job = _job.lock ();
 646                 DCPOMATIC_ASSERT (job);
 647
 648                 job->set_progress_unknown ();
 649
 650                 if (_film->three_d ()) {
 651                         if (!check_existing_picture_asset_frame (asset, _first_nonexistant_frame, EYES_LEFT)) {
 652                                 break;
 653                         }
 654                         if (!check_existing_picture_asset_frame (asset, _first_nonexistant_frame, EYES_RIGHT)) {
 655                                 break;
 656                         }
 657                 } else {
 658                         if (!check_existing_picture_asset_frame (asset, _first_nonexistant_frame, EYES_BOTH)) {
 659                                 break;
 660                         }
 661                 }
 662
 663                 LOG_GENERAL ("Have existing frame %1", _first_nonexistant_frame);
 664                 ++_first_nonexistant_frame;
 665         }
 666
 667         fclose (asset);
 668 }
 669
 670 /** @param frame Frame index.
 671  *  @return true if we can fake-write this frame.
 672  */
 673 bool
 674 Writer::can_fake_write (int frame) const
 675 {
 676         /* We have to do a proper write of the first frame so that we can set up the JPEG2000
 677            parameters in the asset writer.
 678         */
 679         return (frame != 0 && frame < _first_nonexistant_frame);
 680 }
 681
 682 void
 683 Writer::write (PlayerSubtitles subs)
 684 {
 685         if (subs.text.empty ()) {
 686                 return;
 687         }
 688
 689         if (!_subtitle_asset) {
 690                 string lang = _film->subtitle_language ();
 691                 if (lang.empty ()) {
 692                         lang = "Unknown";
 693                 }
 694                 if (_film->interop ()) {
 695                         shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
 696                         s->set_movie_title (_film->name ());
 697                         s->set_language (lang);
 698                         s->set_reel_number ("1");
 699                         _subtitle_asset = s;
 700                 } else {
 701                         shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
 702                         s->set_content_title_text (_film->name ());
 703                         s->set_language (lang);
 704                         s->set_edit_rate (dcp::Fraction (_film->video_frame_rate (), 1));
 705                         s->set_time_code_rate (_film->video_frame_rate ());
 706                         _subtitle_asset = s;
 707                 }
 708         }
 709
 710         for (list<dcp::SubtitleString>::const_iterator i = subs.text.begin(); i != subs.text.end(); ++i) {
 711                 _subtitle_asset->add (*i);
 712         }
 713 }
 714
 715 void
 716 Writer::write (list<shared_ptr<Font> > fonts)
 717 {
 718         /* Just keep a list of fonts and we'll deal with them in ::finish */
 719         copy (fonts.begin (), fonts.end (), back_inserter (_fonts));
 720 }
 721
 722 bool
 723 operator< (QueueItem const & a, QueueItem const & b)
 724 {
 725         if (a.frame != b.frame) {
 726                 return a.frame < b.frame;
 727         }
 728
 729         return static_cast<int> (a.eyes) < static_cast<int> (b.eyes);
 730 }
 731
 732 bool
 733 operator== (QueueItem const & a, QueueItem const & b)
 734 {
 735         return a.frame == b.frame && a.eyes == b.eyes;
 736 }
 737
 738 void
 739 Writer::set_encoder_threads (int threads)
 740 {
 741         _maximum_frames_in_memory = rint (threads * 1.1);
 742 }