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 "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/certificate_chain.h>
  49 #include <dcp/interop_subtitle_asset.h>
  50 #include <dcp/smpte_subtitle_asset.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_GENERAL_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_GENERAL);
  59 #define LOG_DEBUG_ENCODE(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_DEBUG_ENCODE);
  60 #define LOG_TIMING(...) _film->log()->microsecond_log (String::compose (__VA_ARGS__), Log::TYPE_TIMING);
  61 #define LOG_WARNING_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_WARNING);
  62 #define LOG_WARNING(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_WARNING);
  63 #define LOG_ERROR(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_ERROR);
  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 int const Writer::_info_size = 48;
  78
  79 Writer::Writer (shared_ptr<const Film> film, weak_ptr<Job> j)
  80         : _film (film)
  81         , _job (j)
  82         , _first_nonexistant_frame (0)
  83         , _thread (0)
  84         , _finish (false)
  85         , _queued_full_in_memory (0)
  86         , _last_written_frame (-1)
  87         , _last_written_eyes (EYES_RIGHT)
  88         , _maximum_frames_in_memory (0)
  89         , _full_written (0)
  90         , _fake_written (0)
  91         , _repeat_written (0)
  92         , _pushed_to_disk (0)
  93 {
  94         /* Remove any old DCP */
  95         boost::filesystem::remove_all (_film->dir (_film->dcp_name ()));
  96
  97         shared_ptr<Job> job = _job.lock ();
  98         DCPOMATIC_ASSERT (job);
  99
 100         /* Create our picture asset in a subdirectory, named according to those
 101            film's parameters which affect the video output.  We will hard-link
 102            it into the DCP later.
 103         */
 104
 105         if (_film->three_d ()) {
 106                 _picture_asset.reset (new dcp::StereoPictureAsset (dcp::Fraction (_film->video_frame_rate (), 1)));
 107         } else {
 108                 _picture_asset.reset (new dcp::MonoPictureAsset (dcp::Fraction (_film->video_frame_rate (), 1)));
 109         }
 110
 111         _picture_asset->set_size (_film->frame_size ());
 112
 113         if (_film->encrypted ()) {
 114                 _picture_asset->set_key (_film->key ());
 115         }
 116
 117         _picture_asset->set_file (
 118                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename()
 119                 );
 120
 121         job->sub (_("Checking existing image data"));
 122         check_existing_picture_asset ();
 123
 124         _picture_asset_writer = _picture_asset->start_write (
 125                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(),
 126                 _film->interop() ? dcp::INTEROP : dcp::SMPTE,
 127                 _first_nonexistant_frame > 0
 128                 );
 129
 130         if (_film->audio_channels ()) {
 131                 _sound_asset.reset (
 132                         new dcp::SoundAsset (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels ())
 133                         );
 134
 135                 if (_film->encrypted ()) {
 136                         _sound_asset->set_key (_film->key ());
 137                 }
 138
 139                 /* Write the sound asset into the film directory so that we leave the creation
 140                    of the DCP directory until the last minute.
 141                 */
 142                 _sound_asset_writer = _sound_asset->start_write (
 143                         _film->directory() / audio_asset_filename (_sound_asset),
 144                         _film->interop() ? dcp::INTEROP : dcp::SMPTE
 145                         );
 146         }
 147
 148         /* Check that the signer is OK if we need one */
 149         if (_film->is_signed() && !Config::instance()->signer_chain()->valid ()) {
 150                 throw InvalidSignerError ();
 151         }
 152
 153         job->sub (_("Encoding image data"));
 154 }
 155
 156 void
 157 Writer::start ()
 158 {
 159         _thread = new boost::thread (boost::bind (&Writer::thread, this));
 160 }
 161
 162 Writer::~Writer ()
 163 {
 164         terminate_thread (false);
 165 }
 166
 167 void
 168 Writer::write (Data encoded, int frame, Eyes eyes)
 169 {
 170         boost::mutex::scoped_lock lock (_state_mutex);
 171
 172         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 173                 /* The queue is too big; wait until that is sorted out */
 174                 _full_condition.wait (lock);
 175         }
 176
 177         QueueItem qi;
 178         qi.type = QueueItem::FULL;
 179         qi.encoded = encoded;
 180         qi.frame = frame;
 181
 182         if (_film->three_d() && eyes == EYES_BOTH) {
 183                 /* 2D material in a 3D DCP; fake the 3D */
 184                 qi.eyes = EYES_LEFT;
 185                 _queue.push_back (qi);
 186                 ++_queued_full_in_memory;
 187                 qi.eyes = EYES_RIGHT;
 188                 _queue.push_back (qi);
 189                 ++_queued_full_in_memory;
 190         } else {
 191                 qi.eyes = eyes;
 192                 _queue.push_back (qi);
 193                 ++_queued_full_in_memory;
 194         }
 195
 196         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 197         _empty_condition.notify_all ();
 198 }
 199
 200 void
 201 Writer::repeat (int frame, Eyes eyes)
 202 {
 203         boost::mutex::scoped_lock lock (_state_mutex);
 204
 205         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 206                 /* The queue is too big; wait until that is sorted out */
 207                 _full_condition.wait (lock);
 208         }
 209
 210         QueueItem qi;
 211         qi.type = QueueItem::REPEAT;
 212         qi.frame = frame;
 213         if (_film->three_d() && eyes == EYES_BOTH) {
 214                 qi.eyes = EYES_LEFT;
 215                 _queue.push_back (qi);
 216                 qi.eyes = EYES_RIGHT;
 217                 _queue.push_back (qi);
 218         } else {
 219                 qi.eyes = eyes;
 220                 _queue.push_back (qi);
 221         }
 222
 223         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 224         _empty_condition.notify_all ();
 225 }
 226
 227 void
 228 Writer::fake_write (int frame, Eyes eyes)
 229 {
 230         boost::mutex::scoped_lock lock (_state_mutex);
 231
 232         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 233                 /* The queue is too big; wait until that is sorted out */
 234                 _full_condition.wait (lock);
 235         }
 236
 237         FILE* file = fopen_boost (_film->info_file (), "rb");
 238         if (!file) {
 239                 throw ReadFileError (_film->info_file ());
 240         }
 241         dcp::FrameInfo info = read_frame_info (file, frame, eyes);
 242         fclose (file);
 243
 244         QueueItem qi;
 245         qi.type = QueueItem::FAKE;
 246         qi.size = info.size;
 247         qi.frame = frame;
 248         if (_film->three_d() && eyes == EYES_BOTH) {
 249                 qi.eyes = EYES_LEFT;
 250                 _queue.push_back (qi);
 251                 qi.eyes = EYES_RIGHT;
 252                 _queue.push_back (qi);
 253         } else {
 254                 qi.eyes = eyes;
 255                 _queue.push_back (qi);
 256         }
 257
 258         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 259         _empty_condition.notify_all ();
 260 }
 261
 262 /** This method is not thread safe */
 263 void
 264 Writer::write (shared_ptr<const AudioBuffers> audio)
 265 {
 266         if (_sound_asset_writer) {
 267                 _sound_asset_writer->write (audio->data(), audio->frames());
 268         }
 269 }
 270
 271 /** This must be called from Writer::thread() with an appropriate lock held */
 272 bool
 273 Writer::have_sequenced_image_at_queue_head ()
 274 {
 275         if (_queue.empty ()) {
 276                 return false;
 277         }
 278
 279         _queue.sort ();
 280
 281         /* The queue should contain only EYES_LEFT/EYES_RIGHT pairs or EYES_BOTH */
 282
 283         if (_queue.front().eyes == EYES_BOTH) {
 284                 /* 2D */
 285                 return _queue.front().frame == (_last_written_frame + 1);
 286         }
 287
 288         /* 3D */
 289
 290         if (_last_written_eyes == EYES_LEFT && _queue.front().frame == _last_written_frame && _queue.front().eyes == EYES_RIGHT) {
 291                 return true;
 292         }
 293
 294         if (_last_written_eyes == EYES_RIGHT && _queue.front().frame == (_last_written_frame + 1) && _queue.front().eyes == EYES_LEFT) {
 295                 return true;
 296         }
 297
 298         return false;
 299 }
 300
 301 void
 302 Writer::write_frame_info (int frame, Eyes eyes, dcp::FrameInfo info) const
 303 {
 304         FILE* file = 0;
 305         if (boost::filesystem::exists (_film->info_file ())) {
 306                 file = fopen_boost (_film->info_file(), "r+b");
 307         } else {
 308                 file = fopen_boost (_film->info_file(), "wb");
 309         }
 310         if (!file) {
 311                 throw OpenFileError (_film->info_file ());
 312         }
 313         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 314         fwrite (&info.offset, sizeof (info.offset), 1, file);
 315         fwrite (&info.size, sizeof (info.size), 1, file);
 316         fwrite (info.hash.c_str(), 1, info.hash.size(), file);
 317         fclose (file);
 318 }
 319
 320 void
 321 Writer::thread ()
 322 try
 323 {
 324         while (true)
 325         {
 326                 boost::mutex::scoped_lock lock (_state_mutex);
 327
 328                 while (true) {
 329
 330                         if (_finish || _queued_full_in_memory > _maximum_frames_in_memory || have_sequenced_image_at_queue_head ()) {
 331                                 /* We've got something to do: go and do it */
 332                                 break;
 333                         }
 334
 335                         /* Nothing to do: wait until something happens which may indicate that we do */
 336                         LOG_TIMING (N_("writer-sleep queue=%1"), _queue.size());
 337                         _empty_condition.wait (lock);
 338                         LOG_TIMING (N_("writer-wake queue=%1"), _queue.size());
 339                 }
 340
 341                 if (_finish && _queue.empty()) {
 342                         return;
 343                 }
 344
 345                 /* We stop here if we have been asked to finish, and if either the queue
 346                    is empty or we do not have a sequenced image at its head (if this is the
 347                    case we will never terminate as no new frames will be sent once
 348                    _finish is true).
 349                 */
 350                 if (_finish && (!have_sequenced_image_at_queue_head() || _queue.empty())) {
 351                         /* (Hopefully temporarily) log anything that was not written */
 352                         if (!_queue.empty() && !have_sequenced_image_at_queue_head()) {
 353                                 LOG_WARNING (N_("Finishing writer with a left-over queue of %1:"), _queue.size());
 354                                 for (list<QueueItem>::const_iterator i = _queue.begin(); i != _queue.end(); ++i) {
 355                                         if (i->type == QueueItem::FULL) {
 356                                                 LOG_WARNING (N_("- type FULL, frame %1, eyes %2"), i->frame, i->eyes);
 357                                         } else {
 358                                                 LOG_WARNING (N_("- type FAKE, size %1, frame %2, eyes %3"), i->size, i->frame, i->eyes);
 359                                         }
 360                                 }
 361                                 LOG_WARNING (N_("Last written frame %1, last written eyes %2"), _last_written_frame, _last_written_eyes);
 362                         }
 363                         return;
 364                 }
 365                 /* Write any frames that we can write; i.e. those that are in sequence. */
 366                 while (have_sequenced_image_at_queue_head ()) {
 367                         QueueItem qi = _queue.front ();
 368                         _queue.pop_front ();
 369                         if (qi.type == QueueItem::FULL && qi.encoded) {
 370                                 --_queued_full_in_memory;
 371                         }
 372
 373                         lock.unlock ();
 374                         switch (qi.type) {
 375                         case QueueItem::FULL:
 376                         {
 377                                 LOG_DEBUG_ENCODE (N_("Writer FULL-writes %1 (%2)"), qi.frame, qi.eyes);
 378                                 if (!qi.encoded) {
 379                                         qi.encoded = Data (_film->j2c_path (qi.frame, qi.eyes, false));
 380                                 }
 381
 382                                 dcp::FrameInfo fin = _picture_asset_writer->write (qi.encoded->data().get (), qi.encoded->size());
 383                                 write_frame_info (qi.frame, qi.eyes, fin);
 384                                 _last_written[qi.eyes] = qi.encoded;
 385                                 ++_full_written;
 386                                 break;
 387                         }
 388                         case QueueItem::FAKE:
 389                                 LOG_DEBUG_ENCODE (N_("Writer FAKE-writes %1"), qi.frame);
 390                                 _picture_asset_writer->fake_write (qi.size);
 391                                 _last_written[qi.eyes].reset ();
 392                                 ++_fake_written;
 393                                 break;
 394                         case QueueItem::REPEAT:
 395                                 LOG_DEBUG_ENCODE (N_("Writer REPEAT-writes %1"), qi.frame);
 396                                 dcp::FrameInfo fin = _picture_asset_writer->write (
 397                                         _last_written[qi.eyes]->data().get(),
 398                                         _last_written[qi.eyes]->size()
 399                                         );
 400                                 write_frame_info (qi.frame, qi.eyes, fin);
 401                                 ++_repeat_written;
 402                                 break;
 403                         }
 404                         lock.lock ();
 405
 406                         _last_written_frame = qi.frame;
 407                         _last_written_eyes = qi.eyes;
 408
 409                         shared_ptr<Job> job = _job.lock ();
 410                         DCPOMATIC_ASSERT (job);
 411                         int64_t total = _film->length().frames_round (_film->video_frame_rate ());
 412                         if (_film->three_d ()) {
 413                                 /* _full_written and so on are incremented for each eye, so we need to double the total
 414                                    frames to get the correct progress.
 415                                 */
 416                                 total *= 2;
 417                         }
 418                         if (total) {
 419                                 job->set_progress (float (_full_written + _fake_written + _repeat_written) / total);
 420                         }
 421                 }
 422
 423                 while (_queued_full_in_memory > _maximum_frames_in_memory) {
 424                         /* Too many frames in memory which can't yet be written to the stream.
 425                            Write some FULL frames to disk.
 426                         */
 427
 428                         /* Find one from the back of the queue */
 429                         _queue.sort ();
 430                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 431                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 432                                 ++i;
 433                         }
 434
 435                         DCPOMATIC_ASSERT (i != _queue.rend());
 436                         ++_pushed_to_disk;
 437                         lock.unlock ();
 438
 439                         /* i is valid here, even though we don't hold a lock on the mutex,
 440                            since list iterators are unaffected by insertion and only this
 441                            thread could erase the last item in the list.
 442                         */
 443
 444                         LOG_GENERAL (
 445                                 "Writer full (awaiting %1 [last eye was %2]); pushes %3 to disk",
 446                                 _last_written_frame + 1,
 447                                 _last_written_eyes, i->frame
 448                                 );
 449
 450                         i->encoded->write_via_temp (_film->j2c_path (i->frame, i->eyes, true), _film->j2c_path (i->frame, i->eyes, false));
 451
 452                         lock.lock ();
 453                         i->encoded.reset ();
 454                         --_queued_full_in_memory;
 455                 }
 456
 457                 /* The queue has probably just gone down a bit; notify anything wait()ing on _full_condition */
 458                 _full_condition.notify_all ();
 459         }
 460 }
 461 catch (...)
 462 {
 463         store_current ();
 464 }
 465
 466 void
 467 Writer::terminate_thread (bool can_throw)
 468 {
 469         boost::mutex::scoped_lock lock (_state_mutex);
 470         if (_thread == 0) {
 471                 return;
 472         }
 473
 474         _finish = true;
 475         _empty_condition.notify_all ();
 476         _full_condition.notify_all ();
 477         lock.unlock ();
 478
 479         _thread->join ();
 480         if (can_throw) {
 481                 rethrow ();
 482         }
 483
 484         delete _thread;
 485         _thread = 0;
 486 }
 487
 488 void
 489 Writer::finish ()
 490 {
 491         if (!_thread) {
 492                 return;
 493         }
 494
 495         terminate_thread (true);
 496
 497         _picture_asset_writer->finalize ();
 498         if (_sound_asset_writer) {
 499                 _sound_asset_writer->finalize ();
 500         }
 501
 502         /* Hard-link the video asset into the DCP */
 503         boost::filesystem::path video_from = _picture_asset->file ();
 504
 505         boost::filesystem::path video_to;
 506         video_to /= _film->dir (_film->dcp_name());
 507         video_to /= video_asset_filename (_picture_asset);
 508
 509         boost::system::error_code ec;
 510         boost::filesystem::create_hard_link (video_from, video_to, ec);
 511         if (ec) {
 512                 LOG_WARNING_NC ("Hard-link failed; copying instead");
 513                 boost::filesystem::copy_file (video_from, video_to, ec);
 514                 if (ec) {
 515                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 516                         throw FileError (ec.message(), video_from);
 517                 }
 518         }
 519
 520         _picture_asset->set_file (video_to);
 521
 522         /* Move the audio asset into the DCP */
 523
 524         if (_sound_asset) {
 525                 boost::filesystem::path audio_to;
 526                 audio_to /= _film->dir (_film->dcp_name ());
 527                 audio_to /= audio_asset_filename (_sound_asset);
 528
 529                 boost::filesystem::rename (_film->file (audio_asset_filename (_sound_asset)), audio_to, ec);
 530                 if (ec) {
 531                         throw FileError (
 532                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), audio_asset_filename (_sound_asset)
 533                                 );
 534                 }
 535
 536                 _sound_asset->set_file (audio_to);
 537         }
 538
 539         dcp::DCP dcp (_film->dir (_film->dcp_name()));
 540
 541         shared_ptr<dcp::CPL> cpl (
 542                 new dcp::CPL (
 543                         _film->dcp_name(),
 544                         _film->dcp_content_type()->libdcp_kind ()
 545                         )
 546                 );
 547
 548         dcp.add (cpl);
 549
 550         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 551
 552         shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 553         if (mono) {
 554                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelMonoPictureAsset (mono, 0)));
 555         }
 556
 557         shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 558         if (stereo) {
 559                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelStereoPictureAsset (stereo, 0)));
 560         }
 561
 562         if (_sound_asset) {
 563                 reel->add (shared_ptr<dcp::ReelSoundAsset> (new dcp::ReelSoundAsset (_sound_asset, 0)));
 564         }
 565
 566         if (_subtitle_asset) {
 567                 boost::filesystem::path liberation;
 568                 try {
 569                         liberation = shared_path () / "LiberationSans-Regular.ttf";
 570                 } catch (boost::filesystem::filesystem_error& e) {
 571                         /* Hack: try the debian/ubuntu location if getting the shared path failed */
 572                         liberation = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf";
 573                 }
 574
 575                 /* Add all the fonts to the subtitle content */
 576                 BOOST_FOREACH (shared_ptr<Font> i, _fonts) {
 577                         _subtitle_asset->add_font (i->id(), i->file().get_value_or (liberation));
 578                 }
 579
 580                 if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (_subtitle_asset)) {
 581                         boost::filesystem::path directory = _film->dir (_film->dcp_name ()) / _subtitle_asset->id ();
 582                         boost::filesystem::create_directories (directory);
 583                         _subtitle_asset->write (directory / ("sub_" + _subtitle_asset->id() + ".xml"));
 584                 } else {
 585                         _subtitle_asset->write (
 586                                 _film->dir (_film->dcp_name ()) / ("sub_" + _subtitle_asset->id() + ".mxf")
 587                                 );
 588                 }
 589
 590                 reel->add (shared_ptr<dcp::ReelSubtitleAsset> (
 591                                    new dcp::ReelSubtitleAsset (
 592                                            _subtitle_asset,
 593                                            dcp::Fraction (_film->video_frame_rate(), 1),
 594                                            _picture_asset->intrinsic_duration (),
 595                                            0
 596                                            )
 597                                    ));
 598         }
 599
 600         cpl->add (reel);
 601
 602         shared_ptr<Job> job = _job.lock ();
 603         DCPOMATIC_ASSERT (job);
 604
 605         job->sub (_("Computing image digest"));
 606         _picture_asset->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 607
 608         if (_sound_asset) {
 609                 job->sub (_("Computing audio digest"));
 610                 _sound_asset->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 611         }
 612
 613         dcp::XMLMetadata meta;
 614         meta.creator = Config::instance()->dcp_creator ();
 615         if (meta.creator.empty ()) {
 616                 meta.creator = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 617         }
 618         meta.issuer = Config::instance()->dcp_issuer ();
 619         if (meta.issuer.empty ()) {
 620                 meta.issuer = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 621         }
 622         meta.set_issue_date_now ();
 623
 624         cpl->set_metadata (meta);
 625
 626         shared_ptr<const dcp::CertificateChain> signer;
 627         if (_film->is_signed ()) {
 628                 signer = Config::instance()->signer_chain ();
 629                 /* We did check earlier, but check again here to be on the safe side */
 630                 if (!signer->valid ()) {
 631                         throw InvalidSignerError ();
 632                 }
 633         }
 634
 635         dcp.write_xml (_film->interop () ? dcp::INTEROP : dcp::SMPTE, meta, signer);
 636
 637         LOG_GENERAL (
 638                 N_("Wrote %1 FULL, %2 FAKE, %3 REPEAT, %4 pushed to disk"), _full_written, _fake_written, _repeat_written, _pushed_to_disk
 639                 );
 640 }
 641
 642 void
 643 Writer::check_existing_picture_asset ()
 644 {
 645         /* Try to open the existing asset */
 646         FILE* asset_file = fopen_boost (_picture_asset->file(), "rb");
 647         if (!asset_file) {
 648                 LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", _picture_asset->file().string(), errno);
 649                 return;
 650         }
 651
 652         /* Offset of the last dcp::FrameInfo in the info file */
 653         int const n = (boost::filesystem::file_size (_film->info_file ()) / _info_size) - 1;
 654
 655         FILE* info_file = fopen_boost (_film->info_file (), "rb");
 656         if (!info_file) {
 657                 LOG_GENERAL_NC ("Could not open film info file");
 658                 fclose (asset_file);
 659                 return;
 660         }
 661
 662         if (_film->three_d ()) {
 663                 /* Start looking at the last left frame */
 664                 _first_nonexistant_frame = n / 2;
 665         } else {
 666                 _first_nonexistant_frame = n;
 667         }
 668
 669         bool ok = false;
 670
 671         while (!ok) {
 672                 /* Read the data from the info file; for 3D we just check the left
 673                    frames until we find a good one.
 674                 */
 675                 dcp::FrameInfo info = read_frame_info (info_file, _first_nonexistant_frame, _film->three_d () ? EYES_LEFT : EYES_BOTH);
 676
 677                 ok = true;
 678
 679                 /* Read the data from the asset and hash it */
 680                 dcpomatic_fseek (asset_file, info.offset, SEEK_SET);
 681                 Data data (info.size);
 682                 size_t const read = fread (data.data().get(), 1, data.size(), asset_file);
 683                 if (read != static_cast<size_t> (data.size ())) {
 684                         LOG_GENERAL ("Existing frame %1 is incomplete", _first_nonexistant_frame);
 685                         ok = false;
 686                 } else {
 687                         MD5Digester digester;
 688                         digester.add (data.data().get(), data.size());
 689                         if (digester.get() != info.hash) {
 690                                 LOG_GENERAL ("Existing frame %1 failed hash check", _first_nonexistant_frame);
 691                                 ok = false;
 692                         }
 693                 }
 694
 695                 if (!ok) {
 696                         --_first_nonexistant_frame;
 697                 }
 698         }
 699
 700         if (!_film->three_d ()) {
 701                 /* If we are doing 3D we might have found a good L frame with no R, so only
 702                    do this if we're in 2D and we've just found a good B(oth) frame.
 703                 */
 704                 ++_first_nonexistant_frame;
 705         }
 706
 707         fclose (asset_file);
 708         fclose (info_file);
 709 }
 710
 711 /** @param frame Frame index.
 712  *  @return true if we can fake-write this frame.
 713  */
 714 bool
 715 Writer::can_fake_write (int frame) const
 716 {
 717         /* We have to do a proper write of the first frame so that we can set up the JPEG2000
 718            parameters in the asset writer.
 719         */
 720         return (frame != 0 && frame < _first_nonexistant_frame);
 721 }
 722
 723 void
 724 Writer::write (PlayerSubtitles subs)
 725 {
 726         if (subs.text.empty ()) {
 727                 return;
 728         }
 729
 730         if (!_subtitle_asset) {
 731                 string lang = _film->subtitle_language ();
 732                 if (lang.empty ()) {
 733                         lang = "Unknown";
 734                 }
 735                 if (_film->interop ()) {
 736                         shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
 737                         s->set_movie_title (_film->name ());
 738                         s->set_language (lang);
 739                         s->set_reel_number ("1");
 740                         _subtitle_asset = s;
 741                 } else {
 742                         shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
 743                         s->set_content_title_text (_film->name ());
 744                         s->set_language (lang);
 745                         s->set_edit_rate (dcp::Fraction (_film->video_frame_rate (), 1));
 746                         s->set_reel_number (1);
 747                         s->set_time_code_rate (_film->video_frame_rate ());
 748                         s->set_start_time (dcp::Time ());
 749                         _subtitle_asset = s;
 750                 }
 751         }
 752
 753         for (list<dcp::SubtitleString>::const_iterator i = subs.text.begin(); i != subs.text.end(); ++i) {
 754                 _subtitle_asset->add (*i);
 755         }
 756 }
 757
 758 void
 759 Writer::write (list<shared_ptr<Font> > fonts)
 760 {
 761         /* Just keep a list of fonts and we'll deal with them in ::finish */
 762         copy (fonts.begin (), fonts.end (), back_inserter (_fonts));
 763 }
 764
 765 bool
 766 operator< (QueueItem const & a, QueueItem const & b)
 767 {
 768         if (a.frame != b.frame) {
 769                 return a.frame < b.frame;
 770         }
 771
 772         return static_cast<int> (a.eyes) < static_cast<int> (b.eyes);
 773 }
 774
 775 bool
 776 operator== (QueueItem const & a, QueueItem const & b)
 777 {
 778         return a.frame == b.frame && a.eyes == b.eyes;
 779 }
 780
 781 void
 782 Writer::set_encoder_threads (int threads)
 783 {
 784         _maximum_frames_in_memory = lrint (threads * 1.1);
 785 }
 786
 787 long
 788 Writer::frame_info_position (int frame, Eyes eyes) const
 789 {
 790         switch (eyes) {
 791         case EYES_BOTH:
 792                 return frame * _info_size;
 793         case EYES_LEFT:
 794                 return frame * _info_size * 2;
 795         case EYES_RIGHT:
 796                 return frame * _info_size * 2 + _info_size;
 797         default:
 798                 DCPOMATIC_ASSERT (false);
 799         }
 800
 801         DCPOMATIC_ASSERT (false);
 802 }
 803
 804 dcp::FrameInfo
 805 Writer::read_frame_info (FILE* file, int frame, Eyes eyes) const
 806 {
 807         dcp::FrameInfo info;
 808         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 809         fread (&info.offset, sizeof (info.offset), 1, file);
 810         fread (&info.size, sizeof (info.size), 1, file);
 811
 812         char hash_buffer[33];
 813         fread (hash_buffer, 1, 32, file);
 814         hash_buffer[32] = '\0';
 815         info.hash = hash_buffer;
 816
 817         return info;
 818 }