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_DEBUG_ENCODE(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_DEBUG_ENCODE);
  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
  64 /* OS X strikes again */
  65 #undef set_key
  66
  67 using std::make_pair;
  68 using std::pair;
  69 using std::string;
  70 using std::list;
  71 using std::cout;
  72 using boost::shared_ptr;
  73 using boost::weak_ptr;
  74 using boost::dynamic_pointer_cast;
  75
  76 Writer::Writer (shared_ptr<const Film> film, weak_ptr<Job> j)
  77         : _film (film)
  78         , _job (j)
  79         , _first_nonexistant_frame (0)
  80         , _thread (0)
  81         , _finish (false)
  82         , _queued_full_in_memory (0)
  83         , _last_written_frame (-1)
  84         , _last_written_eyes (EYES_RIGHT)
  85         , _maximum_frames_in_memory (0)
  86         , _full_written (0)
  87         , _fake_written (0)
  88         , _repeat_written (0)
  89         , _pushed_to_disk (0)
  90 {
  91         /* Remove any old DCP */
  92         boost::filesystem::remove_all (_film->dir (_film->dcp_name ()));
  93
  94         shared_ptr<Job> job = _job.lock ();
  95         DCPOMATIC_ASSERT (job);
  96
  97         /* Create our picture asset in a subdirectory, named according to those
  98            film's parameters which affect the video output.  We will hard-link
  99            it into the DCP later.
 100         */
 101
 102         if (_film->three_d ()) {
 103                 _picture_asset.reset (new dcp::StereoPictureAsset (dcp::Fraction (_film->video_frame_rate (), 1)));
 104         } else {
 105                 _picture_asset.reset (new dcp::MonoPictureAsset (dcp::Fraction (_film->video_frame_rate (), 1)));
 106         }
 107
 108         _picture_asset->set_size (_film->frame_size ());
 109
 110         if (_film->encrypted ()) {
 111                 _picture_asset->set_key (_film->key ());
 112         }
 113
 114         _picture_asset->set_file (
 115                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename()
 116                 );
 117
 118         job->sub (_("Checking existing image data"));
 119         check_existing_picture_asset ();
 120
 121         _picture_asset_writer = _picture_asset->start_write (
 122                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(),
 123                 _film->interop() ? dcp::INTEROP : dcp::SMPTE,
 124                 _first_nonexistant_frame > 0
 125                 );
 126
 127         if (_film->audio_channels ()) {
 128                 _sound_asset.reset (
 129                         new dcp::SoundAsset (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels ())
 130                         );
 131
 132                 if (_film->encrypted ()) {
 133                         _sound_asset->set_key (_film->key ());
 134                 }
 135
 136                 /* Write the sound asset into the film directory so that we leave the creation
 137                    of the DCP directory until the last minute.
 138                 */
 139                 _sound_asset_writer = _sound_asset->start_write (
 140                         _film->directory() / audio_asset_filename (_sound_asset),
 141                         _film->interop() ? dcp::INTEROP : dcp::SMPTE
 142                         );
 143         }
 144
 145         /* Check that the signer is OK if we need one */
 146         if (_film->is_signed() && !Config::instance()->signer_chain()->valid ()) {
 147                 throw InvalidSignerError ();
 148         }
 149
 150         _thread = new boost::thread (boost::bind (&Writer::thread, this));
 151
 152         job->sub (_("Encoding image data"));
 153 }
 154
 155 Writer::~Writer ()
 156 {
 157         terminate_thread (false);
 158 }
 159
 160 void
 161 Writer::write (Data encoded, int frame, Eyes eyes)
 162 {
 163         boost::mutex::scoped_lock lock (_state_mutex);
 164
 165         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 166                 /* The queue is too big; wait until that is sorted out */
 167                 _full_condition.wait (lock);
 168         }
 169
 170         QueueItem qi;
 171         qi.type = QueueItem::FULL;
 172         qi.encoded = encoded;
 173         qi.frame = frame;
 174
 175         if (_film->three_d() && eyes == EYES_BOTH) {
 176                 /* 2D material in a 3D DCP; fake the 3D */
 177                 qi.eyes = EYES_LEFT;
 178                 _queue.push_back (qi);
 179                 ++_queued_full_in_memory;
 180                 qi.eyes = EYES_RIGHT;
 181                 _queue.push_back (qi);
 182                 ++_queued_full_in_memory;
 183         } else {
 184                 qi.eyes = eyes;
 185                 _queue.push_back (qi);
 186                 ++_queued_full_in_memory;
 187         }
 188
 189         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 190         _empty_condition.notify_all ();
 191 }
 192
 193 void
 194 Writer::repeat (int frame, Eyes eyes)
 195 {
 196         boost::mutex::scoped_lock lock (_state_mutex);
 197
 198         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 199                 /* The queue is too big; wait until that is sorted out */
 200                 _full_condition.wait (lock);
 201         }
 202
 203         QueueItem qi;
 204         qi.type = QueueItem::REPEAT;
 205         qi.frame = frame;
 206         if (_film->three_d() && eyes == EYES_BOTH) {
 207                 qi.eyes = EYES_LEFT;
 208                 _queue.push_back (qi);
 209                 qi.eyes = EYES_RIGHT;
 210                 _queue.push_back (qi);
 211         } else {
 212                 qi.eyes = eyes;
 213                 _queue.push_back (qi);
 214         }
 215
 216         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 217         _empty_condition.notify_all ();
 218 }
 219
 220 void
 221 Writer::fake_write (int frame, Eyes eyes)
 222 {
 223         boost::mutex::scoped_lock lock (_state_mutex);
 224
 225         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 226                 /* The queue is too big; wait until that is sorted out */
 227                 _full_condition.wait (lock);
 228         }
 229
 230         FILE* file = fopen_boost (_film->info_file (), "rb");
 231         if (!file) {
 232                 throw ReadFileError (_film->info_file ());
 233         }
 234         dcp::FrameInfo info = read_frame_info (file, frame, eyes);
 235         fclose (file);
 236
 237         QueueItem qi;
 238         qi.type = QueueItem::FAKE;
 239         qi.size = info.size;
 240         qi.frame = frame;
 241         if (_film->three_d() && eyes == EYES_BOTH) {
 242                 qi.eyes = EYES_LEFT;
 243                 _queue.push_back (qi);
 244                 qi.eyes = EYES_RIGHT;
 245                 _queue.push_back (qi);
 246         } else {
 247                 qi.eyes = eyes;
 248                 _queue.push_back (qi);
 249         }
 250
 251         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 252         _empty_condition.notify_all ();
 253 }
 254
 255 /** This method is not thread safe */
 256 void
 257 Writer::write (shared_ptr<const AudioBuffers> audio)
 258 {
 259         if (_sound_asset_writer) {
 260                 _sound_asset_writer->write (audio->data(), audio->frames());
 261         }
 262 }
 263
 264 /** This must be called from Writer::thread() with an appropriate lock held */
 265 bool
 266 Writer::have_sequenced_image_at_queue_head ()
 267 {
 268         if (_queue.empty ()) {
 269                 return false;
 270         }
 271
 272         _queue.sort ();
 273
 274         /* The queue should contain only EYES_LEFT/EYES_RIGHT pairs or EYES_BOTH */
 275
 276         if (_queue.front().eyes == EYES_BOTH) {
 277                 /* 2D */
 278                 return _queue.front().frame == (_last_written_frame + 1);
 279         }
 280
 281         /* 3D */
 282
 283         if (_last_written_eyes == EYES_LEFT && _queue.front().frame == _last_written_frame && _queue.front().eyes == EYES_RIGHT) {
 284                 return true;
 285         }
 286
 287         if (_last_written_eyes == EYES_RIGHT && _queue.front().frame == (_last_written_frame + 1) && _queue.front().eyes == EYES_LEFT) {
 288                 return true;
 289         }
 290
 291         return false;
 292 }
 293
 294 void
 295 Writer::write_frame_info (int frame, Eyes eyes, dcp::FrameInfo info) const
 296 {
 297         FILE* file = 0;
 298         if (boost::filesystem::exists (_film->info_file ())) {
 299                 file = fopen_boost (_film->info_file(), "r+b");
 300         } else {
 301                 file = fopen_boost (_film->info_file(), "wb");
 302         }
 303         if (!file) {
 304                 throw OpenFileError (_film->info_file ());
 305         }
 306         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 307         fwrite (&info.offset, sizeof (info.offset), 1, file);
 308         fwrite (&info.size, sizeof (info.size), 1, file);
 309         fwrite (info.hash.c_str(), 1, info.hash.size(), file);
 310         fclose (file);
 311 }
 312
 313 void
 314 Writer::thread ()
 315 try
 316 {
 317         while (true)
 318         {
 319                 boost::mutex::scoped_lock lock (_state_mutex);
 320
 321                 while (true) {
 322
 323                         if (_finish || _queued_full_in_memory > _maximum_frames_in_memory || have_sequenced_image_at_queue_head ()) {
 324                                 /* We've got something to do: go and do it */
 325                                 break;
 326                         }
 327
 328                         /* Nothing to do: wait until something happens which may indicate that we do */
 329                         LOG_TIMING (N_("writer-sleep queue=%1"), _queue.size());
 330                         _empty_condition.wait (lock);
 331                         LOG_TIMING (N_("writer-wake queue=%1"), _queue.size());
 332                 }
 333
 334                 if (_finish && _queue.empty()) {
 335                         return;
 336                 }
 337
 338                 /* We stop here if we have been asked to finish, and if either the queue
 339                    is empty or we do not have a sequenced image at its head (if this is the
 340                    case we will never terminate as no new frames will be sent once
 341                    _finish is true).
 342                 */
 343                 if (_finish && (!have_sequenced_image_at_queue_head() || _queue.empty())) {
 344                         /* (Hopefully temporarily) log anything that was not written */
 345                         if (!_queue.empty() && !have_sequenced_image_at_queue_head()) {
 346                                 LOG_WARNING (N_("Finishing writer with a left-over queue of %1:"), _queue.size());
 347                                 for (list<QueueItem>::const_iterator i = _queue.begin(); i != _queue.end(); ++i) {
 348                                         if (i->type == QueueItem::FULL) {
 349                                                 LOG_WARNING (N_("- type FULL, frame %1, eyes %2"), i->frame, i->eyes);
 350                                         } else {
 351                                                 LOG_WARNING (N_("- type FAKE, size %1, frame %2, eyes %3"), i->size, i->frame, i->eyes);
 352                                         }
 353                                 }
 354                                 LOG_WARNING (N_("Last written frame %1, last written eyes %2"), _last_written_frame, _last_written_eyes);
 355                         }
 356                         return;
 357                 }
 358                 /* Write any frames that we can write; i.e. those that are in sequence. */
 359                 while (have_sequenced_image_at_queue_head ()) {
 360                         QueueItem qi = _queue.front ();
 361                         _queue.pop_front ();
 362                         if (qi.type == QueueItem::FULL && qi.encoded) {
 363                                 --_queued_full_in_memory;
 364                         }
 365
 366                         lock.unlock ();
 367                         switch (qi.type) {
 368                         case QueueItem::FULL:
 369                         {
 370                                 LOG_DEBUG_ENCODE (N_("Writer FULL-writes %1 (%2)"), qi.frame, qi.eyes);
 371                                 if (!qi.encoded) {
 372                                         qi.encoded = Data (_film->j2c_path (qi.frame, qi.eyes, false));
 373                                 }
 374
 375                                 dcp::FrameInfo fin = _picture_asset_writer->write (qi.encoded->data().get (), qi.encoded->size());
 376                                 write_frame_info (qi.frame, qi.eyes, fin);
 377                                 _last_written[qi.eyes] = qi.encoded;
 378                                 ++_full_written;
 379                                 break;
 380                         }
 381                         case QueueItem::FAKE:
 382                                 LOG_DEBUG_ENCODE (N_("Writer FAKE-writes %1"), qi.frame);
 383                                 _picture_asset_writer->fake_write (qi.size);
 384                                 _last_written[qi.eyes].reset ();
 385                                 ++_fake_written;
 386                                 break;
 387                         case QueueItem::REPEAT:
 388                                 LOG_DEBUG_ENCODE (N_("Writer REPEAT-writes %1"), qi.frame);
 389                                 dcp::FrameInfo fin = _picture_asset_writer->write (
 390                                         _last_written[qi.eyes]->data().get(),
 391                                         _last_written[qi.eyes]->size()
 392                                         );
 393                                 write_frame_info (qi.frame, qi.eyes, fin);
 394                                 ++_repeat_written;
 395                                 break;
 396                         }
 397                         lock.lock ();
 398
 399                         _last_written_frame = qi.frame;
 400                         _last_written_eyes = qi.eyes;
 401
 402                         shared_ptr<Job> job = _job.lock ();
 403                         DCPOMATIC_ASSERT (job);
 404                         int64_t total = _film->length().frames_round (_film->video_frame_rate ());
 405                         if (_film->three_d ()) {
 406                                 /* _full_written and so on are incremented for each eye, so we need to double the total
 407                                    frames to get the correct progress.
 408                                 */
 409                                 total *= 2;
 410                         }
 411                         if (total) {
 412                                 job->set_progress (float (_full_written + _fake_written + _repeat_written) / total);
 413                         }
 414                 }
 415
 416                 while (_queued_full_in_memory > _maximum_frames_in_memory) {
 417                         /* Too many frames in memory which can't yet be written to the stream.
 418                            Write some FULL frames to disk.
 419                         */
 420
 421                         /* Find one from the back of the queue */
 422                         _queue.sort ();
 423                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 424                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 425                                 ++i;
 426                         }
 427
 428                         DCPOMATIC_ASSERT (i != _queue.rend());
 429                         ++_pushed_to_disk;
 430                         lock.unlock ();
 431
 432                         /* i is valid here, even though we don't hold a lock on the mutex,
 433                            since list iterators are unaffected by insertion and only this
 434                            thread could erase the last item in the list.
 435                         */
 436
 437                         LOG_GENERAL (
 438                                 "Writer full (awaiting %1 [last eye was %2]); pushes %3 to disk",
 439                                 _last_written_frame + 1,
 440                                 _last_written_eyes, i->frame
 441                                 );
 442
 443                         i->encoded->write_via_temp (_film->j2c_path (i->frame, i->eyes, true), _film->j2c_path (i->frame, i->eyes, false));
 444
 445                         lock.lock ();
 446                         i->encoded.reset ();
 447                         --_queued_full_in_memory;
 448                 }
 449
 450                 /* The queue has probably just gone down a bit; notify anything wait()ing on _full_condition */
 451                 _full_condition.notify_all ();
 452         }
 453 }
 454 catch (...)
 455 {
 456         store_current ();
 457 }
 458
 459 void
 460 Writer::terminate_thread (bool can_throw)
 461 {
 462         boost::mutex::scoped_lock lock (_state_mutex);
 463         if (_thread == 0) {
 464                 return;
 465         }
 466
 467         _finish = true;
 468         _empty_condition.notify_all ();
 469         _full_condition.notify_all ();
 470         lock.unlock ();
 471
 472         _thread->join ();
 473         if (can_throw) {
 474                 rethrow ();
 475         }
 476
 477         delete _thread;
 478         _thread = 0;
 479 }
 480
 481 void
 482 Writer::finish ()
 483 {
 484         if (!_thread) {
 485                 return;
 486         }
 487
 488         terminate_thread (true);
 489
 490         _picture_asset_writer->finalize ();
 491         if (_sound_asset_writer) {
 492                 _sound_asset_writer->finalize ();
 493         }
 494
 495         /* Hard-link the video asset into the DCP */
 496         boost::filesystem::path video_from = _picture_asset->file ();
 497
 498         boost::filesystem::path video_to;
 499         video_to /= _film->dir (_film->dcp_name());
 500         video_to /= video_asset_filename (_picture_asset);
 501
 502         boost::system::error_code ec;
 503         boost::filesystem::create_hard_link (video_from, video_to, ec);
 504         if (ec) {
 505                 LOG_WARNING_NC ("Hard-link failed; copying instead");
 506                 boost::filesystem::copy_file (video_from, video_to, ec);
 507                 if (ec) {
 508                         LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 509                         throw FileError (ec.message(), video_from);
 510                 }
 511         }
 512
 513         _picture_asset->set_file (video_to);
 514
 515         /* Move the audio asset into the DCP */
 516
 517         if (_sound_asset) {
 518                 boost::filesystem::path audio_to;
 519                 audio_to /= _film->dir (_film->dcp_name ());
 520                 audio_to /= audio_asset_filename (_sound_asset);
 521
 522                 boost::filesystem::rename (_film->file (audio_asset_filename (_sound_asset)), audio_to, ec);
 523                 if (ec) {
 524                         throw FileError (
 525                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), audio_asset_filename (_sound_asset)
 526                                 );
 527                 }
 528
 529                 _sound_asset->set_file (audio_to);
 530         }
 531
 532         dcp::DCP dcp (_film->dir (_film->dcp_name()));
 533
 534         shared_ptr<dcp::CPL> cpl (
 535                 new dcp::CPL (
 536                         _film->dcp_name(),
 537                         _film->dcp_content_type()->libdcp_kind ()
 538                         )
 539                 );
 540
 541         dcp.add (cpl);
 542
 543         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 544
 545         shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 546         if (mono) {
 547                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelMonoPictureAsset (mono, 0)));
 548         }
 549
 550         shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 551         if (stereo) {
 552                 reel->add (shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelStereoPictureAsset (stereo, 0)));
 553         }
 554
 555         if (_sound_asset) {
 556                 reel->add (shared_ptr<dcp::ReelSoundAsset> (new dcp::ReelSoundAsset (_sound_asset, 0)));
 557         }
 558
 559         if (_subtitle_asset) {
 560                 boost::filesystem::path liberation;
 561                 try {
 562                         liberation = shared_path () / "LiberationSans-Regular.ttf";
 563                 } catch (boost::filesystem::filesystem_error& e) {
 564                         /* Hack: try the debian/ubuntu location if getting the shared path failed */
 565                         liberation = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf";
 566                 }
 567
 568                 /* Add all the fonts to the subtitle content */
 569                 BOOST_FOREACH (shared_ptr<Font> i, _fonts) {
 570                         _subtitle_asset->add_font (i->id(), i->file().get_value_or (liberation));
 571                 }
 572
 573                 if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (_subtitle_asset)) {
 574                         boost::filesystem::path directory = _film->dir (_film->dcp_name ()) / _subtitle_asset->id ();
 575                         boost::filesystem::create_directories (directory);
 576                         _subtitle_asset->write (directory / ("sub_" + _subtitle_asset->id() + ".xml"));
 577                 } else {
 578                         _subtitle_asset->write (
 579                                 _film->dir (_film->dcp_name ()) / ("sub_" + _subtitle_asset->id() + ".mxf")
 580                                 );
 581                 }
 582
 583                 reel->add (shared_ptr<dcp::ReelSubtitleAsset> (
 584                                    new dcp::ReelSubtitleAsset (
 585                                            _subtitle_asset,
 586                                            dcp::Fraction (_film->video_frame_rate(), 1),
 587                                            _picture_asset->intrinsic_duration (),
 588                                            0
 589                                            )
 590                                    ));
 591         }
 592
 593         cpl->add (reel);
 594
 595         shared_ptr<Job> job = _job.lock ();
 596         DCPOMATIC_ASSERT (job);
 597
 598         job->sub (_("Computing image digest"));
 599         _picture_asset->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 600
 601         if (_sound_asset) {
 602                 job->sub (_("Computing audio digest"));
 603                 _sound_asset->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 604         }
 605
 606         dcp::XMLMetadata meta;
 607         meta.creator = Config::instance()->dcp_creator ();
 608         if (meta.creator.empty ()) {
 609                 meta.creator = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 610         }
 611         meta.issuer = Config::instance()->dcp_issuer ();
 612         if (meta.issuer.empty ()) {
 613                 meta.issuer = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 614         }
 615         meta.set_issue_date_now ();
 616
 617         cpl->set_metadata (meta);
 618
 619         shared_ptr<const dcp::CertificateChain> signer;
 620         if (_film->is_signed ()) {
 621                 signer = Config::instance()->signer_chain ();
 622                 /* We did check earlier, but check again here to be on the safe side */
 623                 if (!signer->valid ()) {
 624                         throw InvalidSignerError ();
 625                 }
 626         }
 627
 628         dcp.write_xml (_film->interop () ? dcp::INTEROP : dcp::SMPTE, meta, signer);
 629
 630         LOG_GENERAL (
 631                 N_("Wrote %1 FULL, %2 FAKE, %3 REPEAT, %4 pushed to disk"), _full_written, _fake_written, _repeat_written, _pushed_to_disk
 632                 );
 633 }
 634
 635 bool
 636 Writer::check_existing_picture_asset_frame (FILE* asset, int f, Eyes eyes)
 637 {
 638         /* Read the frame info as written */
 639         FILE* file = fopen_boost (_film->info_file (), "rb");
 640         if (!file) {
 641                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 642                 return false;
 643         }
 644
 645         dcp::FrameInfo info = read_frame_info (file, f, eyes);
 646         fclose (file);
 647         if (info.size == 0) {
 648                 LOG_GENERAL ("Existing frame %1 has no info file", f);
 649                 return false;
 650         }
 651
 652         /* Read the data from the asset and hash it */
 653         dcpomatic_fseek (asset, info.offset, SEEK_SET);
 654         Data data (info.size);
 655         size_t const read = fread (data.data().get(), 1, data.size(), asset);
 656         if (read != static_cast<size_t> (data.size ())) {
 657                 LOG_GENERAL ("Existing frame %1 is incomplete", f);
 658                 return false;
 659         }
 660
 661         MD5Digester digester;
 662         digester.add (data.data().get(), data.size());
 663         if (digester.get() != info.hash) {
 664                 LOG_GENERAL ("Existing frame %1 failed hash check", f);
 665                 return false;
 666         }
 667
 668         return true;
 669 }
 670
 671 void
 672 Writer::check_existing_picture_asset ()
 673 {
 674         /* Try to open the existing asset */
 675         FILE* asset = fopen_boost (_picture_asset->file(), "rb");
 676         if (!asset) {
 677                 LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", _picture_asset->file().string(), errno);
 678                 return;
 679         }
 680
 681         while (true) {
 682
 683                 shared_ptr<Job> job = _job.lock ();
 684                 DCPOMATIC_ASSERT (job);
 685
 686                 job->set_progress_unknown ();
 687
 688                 if (_film->three_d ()) {
 689                         if (!check_existing_picture_asset_frame (asset, _first_nonexistant_frame, EYES_LEFT)) {
 690                                 break;
 691                         }
 692                         if (!check_existing_picture_asset_frame (asset, _first_nonexistant_frame, EYES_RIGHT)) {
 693                                 break;
 694                         }
 695                 } else {
 696                         if (!check_existing_picture_asset_frame (asset, _first_nonexistant_frame, EYES_BOTH)) {
 697                                 break;
 698                         }
 699                 }
 700
 701                 LOG_DEBUG_ENCODE ("Have existing frame %1", _first_nonexistant_frame);
 702                 ++_first_nonexistant_frame;
 703         }
 704
 705         fclose (asset);
 706 }
 707
 708 /** @param frame Frame index.
 709  *  @return true if we can fake-write this frame.
 710  */
 711 bool
 712 Writer::can_fake_write (int frame) const
 713 {
 714         /* We have to do a proper write of the first frame so that we can set up the JPEG2000
 715            parameters in the asset writer.
 716         */
 717         return (frame != 0 && frame < _first_nonexistant_frame);
 718 }
 719
 720 void
 721 Writer::write (PlayerSubtitles subs)
 722 {
 723         if (subs.text.empty ()) {
 724                 return;
 725         }
 726
 727         if (!_subtitle_asset) {
 728                 string lang = _film->subtitle_language ();
 729                 if (lang.empty ()) {
 730                         lang = "Unknown";
 731                 }
 732                 if (_film->interop ()) {
 733                         shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
 734                         s->set_movie_title (_film->name ());
 735                         s->set_language (lang);
 736                         s->set_reel_number ("1");
 737                         _subtitle_asset = s;
 738                 } else {
 739                         shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
 740                         s->set_content_title_text (_film->name ());
 741                         s->set_language (lang);
 742                         s->set_edit_rate (dcp::Fraction (_film->video_frame_rate (), 1));
 743                         s->set_time_code_rate (_film->video_frame_rate ());
 744                         _subtitle_asset = s;
 745                 }
 746         }
 747
 748         for (list<dcp::SubtitleString>::const_iterator i = subs.text.begin(); i != subs.text.end(); ++i) {
 749                 _subtitle_asset->add (*i);
 750         }
 751 }
 752
 753 void
 754 Writer::write (list<shared_ptr<Font> > fonts)
 755 {
 756         /* Just keep a list of fonts and we'll deal with them in ::finish */
 757         copy (fonts.begin (), fonts.end (), back_inserter (_fonts));
 758 }
 759
 760 bool
 761 operator< (QueueItem const & a, QueueItem const & b)
 762 {
 763         if (a.frame != b.frame) {
 764                 return a.frame < b.frame;
 765         }
 766
 767         return static_cast<int> (a.eyes) < static_cast<int> (b.eyes);
 768 }
 769
 770 bool
 771 operator== (QueueItem const & a, QueueItem const & b)
 772 {
 773         return a.frame == b.frame && a.eyes == b.eyes;
 774 }
 775
 776 void
 777 Writer::set_encoder_threads (int threads)
 778 {
 779         _maximum_frames_in_memory = lrint (threads * 1.1);
 780 }
 781
 782 long
 783 Writer::frame_info_position (int frame, Eyes eyes) const
 784 {
 785         static int const info_size = 48;
 786
 787         switch (eyes) {
 788         case EYES_BOTH:
 789                 return frame * info_size;
 790         case EYES_LEFT:
 791                 return frame * info_size * 2;
 792         case EYES_RIGHT:
 793                 return frame * info_size * 2 + info_size;
 794         default:
 795                 DCPOMATIC_ASSERT (false);
 796         }
 797
 798         DCPOMATIC_ASSERT (false);
 799 }
 800
 801 dcp::FrameInfo
 802 Writer::read_frame_info (FILE* file, int frame, Eyes eyes) const
 803 {
 804         dcp::FrameInfo info;
 805         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 806         fread (&info.offset, sizeof (info.offset), 1, file);
 807         fread (&info.size, sizeof (info.size), 1, file);
 808
 809         char hash_buffer[33];
 810         fread (hash_buffer, 1, 32, file);
 811         hash_buffer[32] = '\0';
 812         info.hash = hash_buffer;
 813
 814         return info;
 815 }