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 #include <iostream>
  55
  56 #include "i18n.h"
  57
  58 #define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
  59 #define LOG_GENERAL_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_GENERAL);
  60 #define LOG_DEBUG_ENCODE(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_DEBUG_ENCODE);
  61 #define LOG_TIMING(...) _film->log()->microsecond_log (String::compose (__VA_ARGS__), Log::TYPE_TIMING);
  62 #define LOG_WARNING_NC(...) _film->log()->log (__VA_ARGS__, Log::TYPE_WARNING);
  63 #define LOG_WARNING(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_WARNING);
  64 #define LOG_ERROR(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_ERROR);
  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 int const Writer::_info_size = 48;
  79
  80 Writer::Writer (shared_ptr<const Film> film, weak_ptr<Job> j)
  81         : _film (film)
  82         , _job (j)
  83         , _first_nonexistant_frame (0)
  84         , _thread (0)
  85         , _finish (false)
  86         , _queued_full_in_memory (0)
  87         , _last_written_frame (-1)
  88         , _last_written_eyes (EYES_RIGHT)
  89         , _maximum_frames_in_memory (0)
  90         , _full_written (0)
  91         , _fake_written (0)
  92         , _repeat_written (0)
  93         , _pushed_to_disk (0)
  94 {
  95         /* Remove any old DCP */
  96         boost::filesystem::remove_all (_film->dir (_film->dcp_name ()));
  97
  98         shared_ptr<Job> job = _job.lock ();
  99         DCPOMATIC_ASSERT (job);
 100
 101         /* Create our picture asset in a subdirectory, named according to those
 102            film's parameters which affect the video output.  We will hard-link
 103            it into the DCP later.
 104         */
 105
 106         if (_film->three_d ()) {
 107                 _picture_asset.reset (new dcp::StereoPictureAsset (dcp::Fraction (_film->video_frame_rate (), 1)));
 108         } else {
 109                 _picture_asset.reset (new dcp::MonoPictureAsset (dcp::Fraction (_film->video_frame_rate (), 1)));
 110         }
 111
 112         _picture_asset->set_size (_film->frame_size ());
 113
 114         if (_film->encrypted ()) {
 115                 _picture_asset->set_key (_film->key ());
 116         }
 117
 118         _picture_asset->set_file (
 119                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename()
 120                 );
 121
 122         job->sub (_("Checking existing image data"));
 123         check_existing_picture_asset ();
 124
 125         _picture_asset_writer = _picture_asset->start_write (
 126                 _film->internal_video_asset_dir() / _film->internal_video_asset_filename(),
 127                 _film->interop() ? dcp::INTEROP : dcp::SMPTE,
 128                 _first_nonexistant_frame > 0
 129                 );
 130
 131         if (_film->audio_channels ()) {
 132                 _sound_asset.reset (
 133                         new dcp::SoundAsset (dcp::Fraction (_film->video_frame_rate(), 1), _film->audio_frame_rate (), _film->audio_channels ())
 134                         );
 135
 136                 if (_film->encrypted ()) {
 137                         _sound_asset->set_key (_film->key ());
 138                 }
 139
 140                 /* Write the sound asset into the film directory so that we leave the creation
 141                    of the DCP directory until the last minute.
 142                 */
 143                 _sound_asset_writer = _sound_asset->start_write (
 144                         _film->directory() / audio_asset_filename (_sound_asset),
 145                         _film->interop() ? dcp::INTEROP : dcp::SMPTE
 146                         );
 147         }
 148
 149         /* Check that the signer is OK if we need one */
 150         if (_film->is_signed() && !Config::instance()->signer_chain()->valid ()) {
 151                 throw InvalidSignerError ();
 152         }
 153
 154         job->sub (_("Encoding image data"));
 155 }
 156
 157 void
 158 Writer::start ()
 159 {
 160         _thread = new boost::thread (boost::bind (&Writer::thread, this));
 161 }
 162
 163 Writer::~Writer ()
 164 {
 165         terminate_thread (false);
 166 }
 167
 168 void
 169 Writer::write (Data encoded, int frame, Eyes eyes)
 170 {
 171         boost::mutex::scoped_lock lock (_state_mutex);
 172
 173         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 174                 /* The queue is too big; wait until that is sorted out */
 175                 _full_condition.wait (lock);
 176         }
 177
 178         QueueItem qi;
 179         qi.type = QueueItem::FULL;
 180         qi.encoded = encoded;
 181         qi.frame = frame;
 182
 183         if (_film->three_d() && eyes == EYES_BOTH) {
 184                 /* 2D material in a 3D DCP; fake the 3D */
 185                 qi.eyes = EYES_LEFT;
 186                 _queue.push_back (qi);
 187                 ++_queued_full_in_memory;
 188                 qi.eyes = EYES_RIGHT;
 189                 _queue.push_back (qi);
 190                 ++_queued_full_in_memory;
 191         } else {
 192                 qi.eyes = eyes;
 193                 _queue.push_back (qi);
 194                 ++_queued_full_in_memory;
 195         }
 196
 197         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 198         _empty_condition.notify_all ();
 199 }
 200
 201 void
 202 Writer::repeat (int frame, Eyes eyes)
 203 {
 204         boost::mutex::scoped_lock lock (_state_mutex);
 205
 206         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 207                 /* The queue is too big; wait until that is sorted out */
 208                 _full_condition.wait (lock);
 209         }
 210
 211         QueueItem qi;
 212         qi.type = QueueItem::REPEAT;
 213         qi.frame = frame;
 214         if (_film->three_d() && eyes == EYES_BOTH) {
 215                 qi.eyes = EYES_LEFT;
 216                 _queue.push_back (qi);
 217                 qi.eyes = EYES_RIGHT;
 218                 _queue.push_back (qi);
 219         } else {
 220                 qi.eyes = eyes;
 221                 _queue.push_back (qi);
 222         }
 223
 224         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 225         _empty_condition.notify_all ();
 226 }
 227
 228 void
 229 Writer::fake_write (int frame, Eyes eyes)
 230 {
 231         boost::mutex::scoped_lock lock (_state_mutex);
 232
 233         while (_queued_full_in_memory > _maximum_frames_in_memory) {
 234                 /* The queue is too big; wait until that is sorted out */
 235                 _full_condition.wait (lock);
 236         }
 237
 238         FILE* file = fopen_boost (_film->info_file (), "rb");
 239         if (!file) {
 240                 throw ReadFileError (_film->info_file ());
 241         }
 242         dcp::FrameInfo info = read_frame_info (file, frame, eyes);
 243         fclose (file);
 244
 245         QueueItem qi;
 246         qi.type = QueueItem::FAKE;
 247         qi.size = info.size;
 248         qi.frame = frame;
 249         if (_film->three_d() && eyes == EYES_BOTH) {
 250                 qi.eyes = EYES_LEFT;
 251                 _queue.push_back (qi);
 252                 qi.eyes = EYES_RIGHT;
 253                 _queue.push_back (qi);
 254         } else {
 255                 qi.eyes = eyes;
 256                 _queue.push_back (qi);
 257         }
 258
 259         /* Now there's something to do: wake anything wait()ing on _empty_condition */
 260         _empty_condition.notify_all ();
 261 }
 262
 263 /** This method is not thread safe */
 264 void
 265 Writer::write (shared_ptr<const AudioBuffers> audio)
 266 {
 267         if (_sound_asset_writer) {
 268                 _sound_asset_writer->write (audio->data(), audio->frames());
 269         }
 270 }
 271
 272 /** This must be called from Writer::thread() with an appropriate lock held */
 273 bool
 274 Writer::have_sequenced_image_at_queue_head ()
 275 {
 276         if (_queue.empty ()) {
 277                 return false;
 278         }
 279
 280         _queue.sort ();
 281
 282         /* The queue should contain only EYES_LEFT/EYES_RIGHT pairs or EYES_BOTH */
 283
 284         if (_queue.front().eyes == EYES_BOTH) {
 285                 /* 2D */
 286                 return _queue.front().frame == (_last_written_frame + 1);
 287         }
 288
 289         /* 3D */
 290
 291         if (_last_written_eyes == EYES_LEFT && _queue.front().frame == _last_written_frame && _queue.front().eyes == EYES_RIGHT) {
 292                 return true;
 293         }
 294
 295         if (_last_written_eyes == EYES_RIGHT && _queue.front().frame == (_last_written_frame + 1) && _queue.front().eyes == EYES_LEFT) {
 296                 return true;
 297         }
 298
 299         return false;
 300 }
 301
 302 void
 303 Writer::write_frame_info (int frame, Eyes eyes, dcp::FrameInfo info) const
 304 {
 305         FILE* file = 0;
 306         if (boost::filesystem::exists (_film->info_file ())) {
 307                 file = fopen_boost (_film->info_file(), "r+b");
 308         } else {
 309                 file = fopen_boost (_film->info_file(), "wb");
 310         }
 311         if (!file) {
 312                 throw OpenFileError (_film->info_file ());
 313         }
 314         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 315         fwrite (&info.offset, sizeof (info.offset), 1, file);
 316         fwrite (&info.size, sizeof (info.size), 1, file);
 317         fwrite (info.hash.c_str(), 1, info.hash.size(), file);
 318         fclose (file);
 319 }
 320
 321 void
 322 Writer::thread ()
 323 try
 324 {
 325         while (true)
 326         {
 327                 boost::mutex::scoped_lock lock (_state_mutex);
 328
 329                 while (true) {
 330
 331                         if (_finish || _queued_full_in_memory > _maximum_frames_in_memory || have_sequenced_image_at_queue_head ()) {
 332                                 /* We've got something to do: go and do it */
 333                                 break;
 334                         }
 335
 336                         /* Nothing to do: wait until something happens which may indicate that we do */
 337                         LOG_TIMING (N_("writer-sleep queue=%1"), _queue.size());
 338                         _empty_condition.wait (lock);
 339                         LOG_TIMING (N_("writer-wake queue=%1"), _queue.size());
 340                 }
 341
 342                 if (_finish && _queue.empty()) {
 343                         return;
 344                 }
 345
 346                 /* We stop here if we have been asked to finish, and if either the queue
 347                    is empty or we do not have a sequenced image at its head (if this is the
 348                    case we will never terminate as no new frames will be sent once
 349                    _finish is true).
 350                 */
 351                 if (_finish && (!have_sequenced_image_at_queue_head() || _queue.empty())) {
 352                         /* (Hopefully temporarily) log anything that was not written */
 353                         if (!_queue.empty() && !have_sequenced_image_at_queue_head()) {
 354                                 LOG_WARNING (N_("Finishing writer with a left-over queue of %1:"), _queue.size());
 355                                 for (list<QueueItem>::const_iterator i = _queue.begin(); i != _queue.end(); ++i) {
 356                                         if (i->type == QueueItem::FULL) {
 357                                                 LOG_WARNING (N_("- type FULL, frame %1, eyes %2"), i->frame, i->eyes);
 358                                         } else {
 359                                                 LOG_WARNING (N_("- type FAKE, size %1, frame %2, eyes %3"), i->size, i->frame, i->eyes);
 360                                         }
 361                                 }
 362                                 LOG_WARNING (N_("Last written frame %1, last written eyes %2"), _last_written_frame, _last_written_eyes);
 363                         }
 364                         return;
 365                 }
 366                 /* Write any frames that we can write; i.e. those that are in sequence. */
 367                 while (have_sequenced_image_at_queue_head ()) {
 368                         QueueItem qi = _queue.front ();
 369                         _queue.pop_front ();
 370                         if (qi.type == QueueItem::FULL && qi.encoded) {
 371                                 --_queued_full_in_memory;
 372                         }
 373
 374                         lock.unlock ();
 375                         switch (qi.type) {
 376                         case QueueItem::FULL:
 377                         {
 378                                 LOG_DEBUG_ENCODE (N_("Writer FULL-writes %1 (%2)"), qi.frame, qi.eyes);
 379                                 if (!qi.encoded) {
 380                                         qi.encoded = Data (_film->j2c_path (qi.frame, qi.eyes, false));
 381                                 }
 382
 383                                 dcp::FrameInfo fin = _picture_asset_writer->write (qi.encoded->data().get (), qi.encoded->size());
 384                                 write_frame_info (qi.frame, qi.eyes, fin);
 385                                 _last_written[qi.eyes] = qi.encoded;
 386                                 ++_full_written;
 387                                 break;
 388                         }
 389                         case QueueItem::FAKE:
 390                                 LOG_DEBUG_ENCODE (N_("Writer FAKE-writes %1"), qi.frame);
 391                                 _picture_asset_writer->fake_write (qi.size);
 392                                 _last_written[qi.eyes].reset ();
 393                                 ++_fake_written;
 394                                 break;
 395                         case QueueItem::REPEAT:
 396                                 LOG_DEBUG_ENCODE (N_("Writer REPEAT-writes %1"), qi.frame);
 397                                 dcp::FrameInfo fin = _picture_asset_writer->write (
 398                                         _last_written[qi.eyes]->data().get(),
 399                                         _last_written[qi.eyes]->size()
 400                                         );
 401                                 write_frame_info (qi.frame, qi.eyes, fin);
 402                                 ++_repeat_written;
 403                                 break;
 404                         }
 405                         lock.lock ();
 406
 407                         _last_written_frame = qi.frame;
 408                         _last_written_eyes = qi.eyes;
 409
 410                         shared_ptr<Job> job = _job.lock ();
 411                         DCPOMATIC_ASSERT (job);
 412                         int64_t total = _film->length().frames_round (_film->video_frame_rate ());
 413                         if (_film->three_d ()) {
 414                                 /* _full_written and so on are incremented for each eye, so we need to double the total
 415                                    frames to get the correct progress.
 416                                 */
 417                                 total *= 2;
 418                         }
 419                         if (total) {
 420                                 job->set_progress (float (_full_written + _fake_written + _repeat_written) / total);
 421                         }
 422                 }
 423
 424                 while (_queued_full_in_memory > _maximum_frames_in_memory) {
 425                         /* Too many frames in memory which can't yet be written to the stream.
 426                            Write some FULL frames to disk.
 427                         */
 428
 429                         /* Find one from the back of the queue */
 430                         _queue.sort ();
 431                         list<QueueItem>::reverse_iterator i = _queue.rbegin ();
 432                         while (i != _queue.rend() && (i->type != QueueItem::FULL || !i->encoded)) {
 433                                 ++i;
 434                         }
 435
 436                         DCPOMATIC_ASSERT (i != _queue.rend());
 437                         ++_pushed_to_disk;
 438                         lock.unlock ();
 439
 440                         /* i is valid here, even though we don't hold a lock on the mutex,
 441                            since list iterators are unaffected by insertion and only this
 442                            thread could erase the last item in the list.
 443                         */
 444
 445                         LOG_GENERAL (
 446                                 "Writer full (awaiting %1 [last eye was %2]); pushes %3 to disk",
 447                                 _last_written_frame + 1,
 448                                 _last_written_eyes, i->frame
 449                                 );
 450
 451                         i->encoded->write_via_temp (_film->j2c_path (i->frame, i->eyes, true), _film->j2c_path (i->frame, i->eyes, false));
 452
 453                         lock.lock ();
 454                         i->encoded.reset ();
 455                         --_queued_full_in_memory;
 456                 }
 457
 458                 /* The queue has probably just gone down a bit; notify anything wait()ing on _full_condition */
 459                 _full_condition.notify_all ();
 460         }
 461 }
 462 catch (...)
 463 {
 464         store_current ();
 465 }
 466
 467 void
 468 Writer::terminate_thread (bool can_throw)
 469 {
 470         boost::mutex::scoped_lock lock (_state_mutex);
 471         if (_thread == 0) {
 472                 return;
 473         }
 474
 475         _finish = true;
 476         _empty_condition.notify_all ();
 477         _full_condition.notify_all ();
 478         lock.unlock ();
 479
 480         DCPOMATIC_ASSERT (_thread->joinable ());
 481         _thread->join ();
 482         if (can_throw) {
 483                 rethrow ();
 484         }
 485
 486         delete _thread;
 487         _thread = 0;
 488 }
 489
 490 void
 491 Writer::finish ()
 492 {
 493         if (!_thread) {
 494                 return;
 495         }
 496
 497         terminate_thread (true);
 498
 499         if (!_picture_asset_writer->finalize ()) {
 500                 /* Nothing was written to the picture asset */
 501                 _picture_asset.reset ();
 502         }
 503
 504         if (_sound_asset_writer) {
 505                 if (!_sound_asset_writer->finalize ()) {
 506                         /* Nothing was written to the sound asset */
 507                         _sound_asset.reset ();
 508                 }
 509         }
 510
 511         /* Hard-link any video asset file into the DCP */
 512         if (_picture_asset) {
 513                 boost::filesystem::path video_from = _picture_asset->file ();
 514                 boost::filesystem::path video_to;
 515                 video_to /= _film->dir (_film->dcp_name());
 516                 video_to /= video_asset_filename (_picture_asset);
 517
 518                 boost::system::error_code ec;
 519                 boost::filesystem::create_hard_link (video_from, video_to, ec);
 520                 if (ec) {
 521                         LOG_WARNING_NC ("Hard-link failed; copying instead");
 522                         boost::filesystem::copy_file (video_from, video_to, ec);
 523                         if (ec) {
 524                                 LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message ());
 525                                 throw FileError (ec.message(), video_from);
 526                         }
 527                 }
 528
 529                 _picture_asset->set_file (video_to);
 530         }
 531
 532         /* Move the audio asset into the DCP */
 533         if (_sound_asset) {
 534                 boost::filesystem::path audio_to;
 535                 audio_to /= _film->dir (_film->dcp_name ());
 536                 audio_to /= audio_asset_filename (_sound_asset);
 537
 538                 boost::system::error_code ec;
 539                 boost::filesystem::rename (_film->file (audio_asset_filename (_sound_asset)), audio_to, ec);
 540                 if (ec) {
 541                         throw FileError (
 542                                 String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), audio_asset_filename (_sound_asset)
 543                                 );
 544                 }
 545
 546                 _sound_asset->set_file (audio_to);
 547         }
 548
 549         dcp::DCP dcp (_film->dir (_film->dcp_name()));
 550
 551         shared_ptr<dcp::CPL> cpl (
 552                 new dcp::CPL (
 553                         _film->dcp_name(),
 554                         _film->dcp_content_type()->libdcp_kind ()
 555                         )
 556                 );
 557
 558         dcp.add (cpl);
 559
 560         shared_ptr<dcp::Reel> reel (new dcp::Reel ());
 561
 562         shared_ptr<dcp::ReelPictureAsset> reel_picture_asset;
 563
 564         if (_picture_asset) {
 565                 /* We have made a picture asset of our own.  Put it into the reel */
 566                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
 567                 if (mono) {
 568                         reel_picture_asset.reset (new dcp::ReelMonoPictureAsset (mono, 0));
 569                 }
 570
 571                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
 572                 if (stereo && boost::filesystem::exists (stereo->file ())) {
 573                         reel_picture_asset.reset (new dcp::ReelStereoPictureAsset (stereo, 0));
 574                 }
 575         } else {
 576                 /* We don't have a picture asset of our own; maybe we need to reference one */
 577                 /* XXX: this is all a hack */
 578                 BOOST_FOREACH (shared_ptr<dcp::ReelAsset> i, _reel_assets) {
 579                         shared_ptr<dcp::ReelPictureAsset> j = dynamic_pointer_cast<dcp::ReelPictureAsset> (i);
 580                         if (j) {
 581                                 reel_picture_asset = j;
 582                         }
 583                 }
 584         }
 585
 586         reel->add (reel_picture_asset);
 587
 588         if (_sound_asset) {
 589                 /* We have made a sound asset of our own.  Put it into the reel */
 590                 reel->add (shared_ptr<dcp::ReelSoundAsset> (new dcp::ReelSoundAsset (_sound_asset, 0)));
 591         } else {
 592                 /* We don't have a sound asset of our own; maybe we need to reference one */
 593                 /* XXX: this is all a hack */
 594                 BOOST_FOREACH (shared_ptr<dcp::ReelAsset> i, _reel_assets) {
 595                         if (dynamic_pointer_cast<dcp::ReelSoundAsset> (i)) {
 596                                 reel->add (i);
 597                         }
 598                 }
 599         }
 600
 601         if (_subtitle_asset) {
 602                 boost::filesystem::path liberation;
 603                 try {
 604                         liberation = shared_path () / "LiberationSans-Regular.ttf";
 605                 } catch (boost::filesystem::filesystem_error& e) {
 606                         /* Hack: try the debian/ubuntu location if getting the shared path failed */
 607                         liberation = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf";
 608                 }
 609
 610                 /* Add all the fonts to the subtitle content */
 611                 BOOST_FOREACH (shared_ptr<Font> i, _fonts) {
 612                         _subtitle_asset->add_font (i->id(), i->file().get_value_or (liberation));
 613                 }
 614
 615                 if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (_subtitle_asset)) {
 616                         boost::filesystem::path directory = _film->dir (_film->dcp_name ()) / _subtitle_asset->id ();
 617                         boost::filesystem::create_directories (directory);
 618                         _subtitle_asset->write (directory / ("sub_" + _subtitle_asset->id() + ".xml"));
 619                 } else {
 620                         _subtitle_asset->write (
 621                                 _film->dir (_film->dcp_name ()) / ("sub_" + _subtitle_asset->id() + ".mxf")
 622                                 );
 623                 }
 624
 625                 reel->add (shared_ptr<dcp::ReelSubtitleAsset> (
 626                                    new dcp::ReelSubtitleAsset (
 627                                            _subtitle_asset,
 628                                            dcp::Fraction (_film->video_frame_rate(), 1),
 629                                            reel_picture_asset->intrinsic_duration (),
 630                                            0
 631                                            )
 632                                    ));
 633         } else {
 634                 /* We don't have a subtitle asset of our own; maybe we need to reference one */
 635                 /* XXX: this is all a hack */
 636                 BOOST_FOREACH (shared_ptr<dcp::ReelAsset> i, _reel_assets) {
 637                         if (dynamic_pointer_cast<dcp::ReelSubtitleAsset> (i)) {
 638                                 reel->add (i);
 639                         }
 640                 }
 641         }
 642
 643         cpl->add (reel);
 644
 645         shared_ptr<Job> job = _job.lock ();
 646         DCPOMATIC_ASSERT (job);
 647
 648         job->sub (_("Computing image digest"));
 649         if (_picture_asset) {
 650                 _picture_asset->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 651         }
 652
 653         if (_sound_asset) {
 654                 job->sub (_("Computing audio digest"));
 655                 _sound_asset->hash (boost::bind (&Job::set_progress, job.get(), _1, false));
 656         }
 657
 658         dcp::XMLMetadata meta;
 659         meta.creator = Config::instance()->dcp_creator ();
 660         if (meta.creator.empty ()) {
 661                 meta.creator = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 662         }
 663         meta.issuer = Config::instance()->dcp_issuer ();
 664         if (meta.issuer.empty ()) {
 665                 meta.issuer = String::compose ("DCP-o-matic %1 %2", dcpomatic_version, dcpomatic_git_commit);
 666         }
 667         meta.set_issue_date_now ();
 668
 669         cpl->set_metadata (meta);
 670
 671         shared_ptr<const dcp::CertificateChain> signer;
 672         if (_film->is_signed ()) {
 673                 signer = Config::instance()->signer_chain ();
 674                 /* We did check earlier, but check again here to be on the safe side */
 675                 if (!signer->valid ()) {
 676                         throw InvalidSignerError ();
 677                 }
 678         }
 679
 680         dcp.write_xml (_film->interop () ? dcp::INTEROP : dcp::SMPTE, meta, signer);
 681
 682         LOG_GENERAL (
 683                 N_("Wrote %1 FULL, %2 FAKE, %3 REPEAT, %4 pushed to disk"), _full_written, _fake_written, _repeat_written, _pushed_to_disk
 684                 );
 685 }
 686
 687 void
 688 Writer::check_existing_picture_asset ()
 689 {
 690         /* Try to open the existing asset */
 691         FILE* asset_file = fopen_boost (_picture_asset->file(), "rb");
 692         if (!asset_file) {
 693                 LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", _picture_asset->file().string(), errno);
 694                 return;
 695         }
 696
 697         /* Offset of the last dcp::FrameInfo in the info file */
 698         int const n = (boost::filesystem::file_size (_film->info_file ()) / _info_size) - 1;
 699
 700         FILE* info_file = fopen_boost (_film->info_file (), "rb");
 701         if (!info_file) {
 702                 LOG_GENERAL_NC ("Could not open film info file");
 703                 fclose (asset_file);
 704                 return;
 705         }
 706
 707         if (_film->three_d ()) {
 708                 /* Start looking at the last left frame */
 709                 _first_nonexistant_frame = n / 2;
 710         } else {
 711                 _first_nonexistant_frame = n;
 712         }
 713
 714         bool ok = false;
 715
 716         while (!ok) {
 717                 /* Read the data from the info file; for 3D we just check the left
 718                    frames until we find a good one.
 719                 */
 720                 dcp::FrameInfo info = read_frame_info (info_file, _first_nonexistant_frame, _film->three_d () ? EYES_LEFT : EYES_BOTH);
 721
 722                 ok = true;
 723
 724                 /* Read the data from the asset and hash it */
 725                 dcpomatic_fseek (asset_file, info.offset, SEEK_SET);
 726                 Data data (info.size);
 727                 size_t const read = fread (data.data().get(), 1, data.size(), asset_file);
 728                 if (read != static_cast<size_t> (data.size ())) {
 729                         LOG_GENERAL ("Existing frame %1 is incomplete", _first_nonexistant_frame);
 730                         ok = false;
 731                 } else {
 732                         MD5Digester digester;
 733                         digester.add (data.data().get(), data.size());
 734                         if (digester.get() != info.hash) {
 735                                 LOG_GENERAL ("Existing frame %1 failed hash check", _first_nonexistant_frame);
 736                                 ok = false;
 737                         }
 738                 }
 739
 740                 if (!ok) {
 741                         --_first_nonexistant_frame;
 742                 }
 743         }
 744
 745         if (!_film->three_d ()) {
 746                 /* If we are doing 3D we might have found a good L frame with no R, so only
 747                    do this if we're in 2D and we've just found a good B(oth) frame.
 748                 */
 749                 ++_first_nonexistant_frame;
 750         }
 751
 752         fclose (asset_file);
 753         fclose (info_file);
 754 }
 755
 756 /** @param frame Frame index.
 757  *  @return true if we can fake-write this frame.
 758  */
 759 bool
 760 Writer::can_fake_write (int frame) const
 761 {
 762         /* We have to do a proper write of the first frame so that we can set up the JPEG2000
 763            parameters in the asset writer.
 764         */
 765         return (frame != 0 && frame < _first_nonexistant_frame);
 766 }
 767
 768 void
 769 Writer::write (PlayerSubtitles subs)
 770 {
 771         if (subs.text.empty ()) {
 772                 return;
 773         }
 774
 775         if (!_subtitle_asset) {
 776                 string lang = _film->subtitle_language ();
 777                 if (lang.empty ()) {
 778                         lang = "Unknown";
 779                 }
 780                 if (_film->interop ()) {
 781                         shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
 782                         s->set_movie_title (_film->name ());
 783                         s->set_language (lang);
 784                         s->set_reel_number ("1");
 785                         _subtitle_asset = s;
 786                 } else {
 787                         shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
 788                         s->set_content_title_text (_film->name ());
 789                         s->set_language (lang);
 790                         s->set_edit_rate (dcp::Fraction (_film->video_frame_rate (), 1));
 791                         s->set_reel_number (1);
 792                         s->set_time_code_rate (_film->video_frame_rate ());
 793                         s->set_start_time (dcp::Time ());
 794                         _subtitle_asset = s;
 795                 }
 796         }
 797
 798         for (list<dcp::SubtitleString>::const_iterator i = subs.text.begin(); i != subs.text.end(); ++i) {
 799                 _subtitle_asset->add (*i);
 800         }
 801 }
 802
 803 void
 804 Writer::write (list<shared_ptr<Font> > fonts)
 805 {
 806         /* Just keep a list of fonts and we'll deal with them in ::finish */
 807         copy (fonts.begin (), fonts.end (), back_inserter (_fonts));
 808 }
 809
 810 bool
 811 operator< (QueueItem const & a, QueueItem const & b)
 812 {
 813         if (a.frame != b.frame) {
 814                 return a.frame < b.frame;
 815         }
 816
 817         return static_cast<int> (a.eyes) < static_cast<int> (b.eyes);
 818 }
 819
 820 bool
 821 operator== (QueueItem const & a, QueueItem const & b)
 822 {
 823         return a.frame == b.frame && a.eyes == b.eyes;
 824 }
 825
 826 void
 827 Writer::set_encoder_threads (int threads)
 828 {
 829         _maximum_frames_in_memory = lrint (threads * 1.1);
 830 }
 831
 832 long
 833 Writer::frame_info_position (int frame, Eyes eyes) const
 834 {
 835         switch (eyes) {
 836         case EYES_BOTH:
 837                 return frame * _info_size;
 838         case EYES_LEFT:
 839                 return frame * _info_size * 2;
 840         case EYES_RIGHT:
 841                 return frame * _info_size * 2 + _info_size;
 842         default:
 843                 DCPOMATIC_ASSERT (false);
 844         }
 845
 846         DCPOMATIC_ASSERT (false);
 847 }
 848
 849 dcp::FrameInfo
 850 Writer::read_frame_info (FILE* file, int frame, Eyes eyes) const
 851 {
 852         dcp::FrameInfo info;
 853         dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
 854         fread (&info.offset, sizeof (info.offset), 1, file);
 855         fread (&info.size, sizeof (info.size), 1, file);
 856
 857         char hash_buffer[33];
 858         fread (hash_buffer, 1, 32, file);
 859         hash_buffer[32] = '\0';
 860         info.hash = hash_buffer;
 861
 862         return info;
 863 }
 864
 865 void
 866 Writer::write (shared_ptr<dcp::ReelAsset> asset)
 867 {
 868         _reel_assets.push_back (asset);
 869 }