src/lib/player.cc

   1 /*
   2     Copyright (C) 2013-2021 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21
  22 #include "atmos_decoder.h"
  23 #include "audio_buffers.h"
  24 #include "audio_content.h"
  25 #include "audio_decoder.h"
  26 #include "audio_processor.h"
  27 #include "compose.hpp"
  28 #include "config.h"
  29 #include "content_audio.h"
  30 #include "content_video.h"
  31 #include "dcp_content.h"
  32 #include "dcp_decoder.h"
  33 #include "dcpomatic_log.h"
  34 #include "decoder.h"
  35 #include "decoder_factory.h"
  36 #include "ffmpeg_content.h"
  37 #include "film.h"
  38 #include "frame_rate_change.h"
  39 #include "image.h"
  40 #include "image_decoder.h"
  41 #include "job.h"
  42 #include "log.h"
  43 #include "maths_util.h"
  44 #include "piece.h"
  45 #include "player.h"
  46 #include "player_video.h"
  47 #include "playlist.h"
  48 #include "ratio.h"
  49 #include "raw_image_proxy.h"
  50 #include "referenced_reel_asset.h"
  51 #include "render_text.h"
  52 #include "shuffler.h"
  53 #include "text_content.h"
  54 #include "text_decoder.h"
  55 #include "timer.h"
  56 #include "video_decoder.h"
  57 #include <dcp/reel.h>
  58 #include <dcp/reel_closed_caption_asset.h>
  59 #include <dcp/reel_picture_asset.h>
  60 #include <dcp/reel_sound_asset.h>
  61 #include <dcp/reel_subtitle_asset.h>
  62 #include <algorithm>
  63 #include <iostream>
  64 #include <stdint.h>
  65
  66 #include "i18n.h"
  67
  68
  69 using std::copy;
  70 using std::cout;
  71 using std::dynamic_pointer_cast;
  72 using std::list;
  73 using std::make_pair;
  74 using std::make_shared;
  75 using std::make_shared;
  76 using std::max;
  77 using std::min;
  78 using std::min;
  79 using std::pair;
  80 using std::shared_ptr;
  81 using std::vector;
  82 using std::weak_ptr;
  83 using boost::optional;
  84 using boost::scoped_ptr;
  85 #if BOOST_VERSION >= 106100
  86 using namespace boost::placeholders;
  87 #endif
  88 using namespace dcpomatic;
  89
  90
  91 int const PlayerProperty::VIDEO_CONTAINER_SIZE = 700;
  92 int const PlayerProperty::PLAYLIST = 701;
  93 int const PlayerProperty::FILM_CONTAINER = 702;
  94 int const PlayerProperty::FILM_VIDEO_FRAME_RATE = 703;
  95 int const PlayerProperty::DCP_DECODE_REDUCTION = 704;
  96 int const PlayerProperty::PLAYBACK_LENGTH = 705;
  97
  98
  99 Player::Player (shared_ptr<const Film> film, Image::Alignment subtitle_alignment)
 100         : _film (film)
 101         , _suspended (0)
 102         , _tolerant (film->tolerant())
 103         , _audio_merger (_film->audio_frame_rate())
 104         , _subtitle_alignment (subtitle_alignment)
 105 {
 106         construct ();
 107 }
 108
 109
 110 Player::Player (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist_)
 111         : _film (film)
 112         , _playlist (playlist_)
 113         , _suspended (0)
 114         , _tolerant (film->tolerant())
 115         , _audio_merger (_film->audio_frame_rate())
 116 {
 117         construct ();
 118 }
 119
 120
 121 void
 122 Player::construct ()
 123 {
 124         _film_changed_connection = _film->Change.connect (bind (&Player::film_change, this, _1, _2));
 125         /* The butler must hear about this first, so since we are proxying this through to the butler we must
 126            be first.
 127         */
 128         _playlist_change_connection = playlist()->Change.connect (bind (&Player::playlist_change, this, _1), boost::signals2::at_front);
 129         _playlist_content_change_connection = playlist()->ContentChange.connect (bind(&Player::playlist_content_change, this, _1, _3, _4));
 130         set_video_container_size (_film->frame_size ());
 131
 132         film_change (ChangeType::DONE, Film::Property::AUDIO_PROCESSOR);
 133
 134         setup_pieces ();
 135         seek (DCPTime (), true);
 136 }
 137
 138
 139 void
 140 Player::setup_pieces ()
 141 {
 142         boost::mutex::scoped_lock lm (_mutex);
 143         setup_pieces_unlocked ();
 144 }
 145
 146
 147 void
 148 Player::setup_pieces_unlocked ()
 149 {
 150         _playback_length = _playlist ? _playlist->length(_film) : _film->length();
 151
 152         auto old_pieces = _pieces;
 153         _pieces.clear ();
 154
 155         auto playlist_content = playlist()->content();
 156         bool const have_threed = std::any_of(
 157                 playlist_content.begin(),
 158                 playlist_content.end(),
 159                 [](shared_ptr<const Content> c) {
 160                         return c->video && (c->video->frame_type() == VideoFrameType::THREE_D_LEFT || c->video->frame_type() == VideoFrameType::THREE_D_RIGHT);
 161                 });
 162
 163
 164         if (have_threed) {
 165                 _shuffler.reset(new Shuffler());
 166                 _shuffler->Video.connect(bind(&Player::video, this, _1, _2));
 167         }
 168
 169         for (auto i: playlist()->content()) {
 170
 171                 if (!i->paths_valid ()) {
 172                         continue;
 173                 }
 174
 175                 if (_ignore_video && _ignore_audio && i->text.empty()) {
 176                         /* We're only interested in text and this content has none */
 177                         continue;
 178                 }
 179
 180                 shared_ptr<Decoder> old_decoder;
 181                 for (auto j: old_pieces) {
 182                         if (j->content == i) {
 183                                 old_decoder = j->decoder;
 184                                 break;
 185                         }
 186                 }
 187
 188                 auto decoder = decoder_factory (_film, i, _fast, _tolerant, old_decoder);
 189                 DCPOMATIC_ASSERT (decoder);
 190
 191                 FrameRateChange frc (_film, i);
 192
 193                 if (decoder->video && _ignore_video) {
 194                         decoder->video->set_ignore (true);
 195                 }
 196
 197                 if (decoder->audio && _ignore_audio) {
 198                         decoder->audio->set_ignore (true);
 199                 }
 200
 201                 if (_ignore_text) {
 202                         for (auto i: decoder->text) {
 203                                 i->set_ignore (true);
 204                         }
 205                 }
 206
 207                 auto dcp = dynamic_pointer_cast<DCPDecoder> (decoder);
 208                 if (dcp) {
 209                         dcp->set_decode_referenced (_play_referenced);
 210                         if (_play_referenced) {
 211                                 dcp->set_forced_reduction (_dcp_decode_reduction);
 212                         }
 213                 }
 214
 215                 auto piece = make_shared<Piece>(i, decoder, frc);
 216                 _pieces.push_back (piece);
 217
 218                 if (decoder->video) {
 219                         if (have_threed) {
 220                                 /* We need a Shuffler to cope with 3D L/R video data arriving out of sequence */
 221                                 decoder->video->Data.connect (bind(&Shuffler::video, _shuffler.get(), weak_ptr<Piece>(piece), _1));
 222                         } else {
 223                                 decoder->video->Data.connect (bind(&Player::video, this, weak_ptr<Piece>(piece), _1));
 224                         }
 225                 }
 226
 227                 if (decoder->audio) {
 228                         decoder->audio->Data.connect (bind (&Player::audio, this, weak_ptr<Piece> (piece), _1, _2));
 229                 }
 230
 231                 auto j = decoder->text.begin();
 232
 233                 while (j != decoder->text.end()) {
 234                         (*j)->BitmapStart.connect (
 235                                 bind(&Player::bitmap_text_start, this, weak_ptr<Piece>(piece), weak_ptr<const TextContent>((*j)->content()), _1)
 236                                 );
 237                         (*j)->PlainStart.connect (
 238                                 bind(&Player::plain_text_start, this, weak_ptr<Piece>(piece), weak_ptr<const TextContent>((*j)->content()), _1)
 239                                 );
 240                         (*j)->Stop.connect (
 241                                 bind(&Player::subtitle_stop, this, weak_ptr<Piece>(piece), weak_ptr<const TextContent>((*j)->content()), _1)
 242                                 );
 243
 244                         ++j;
 245                 }
 246
 247                 if (decoder->atmos) {
 248                         decoder->atmos->Data.connect (bind(&Player::atmos, this, weak_ptr<Piece>(piece), _1));
 249                 }
 250         }
 251
 252         _stream_states.clear ();
 253         for (auto i: _pieces) {
 254                 if (i->content->audio) {
 255                         for (auto j: i->content->audio->streams()) {
 256                                 _stream_states[j] = StreamState (i, i->content->position ());
 257                         }
 258                 }
 259         }
 260
 261         auto ignore_overlap = [](shared_ptr<VideoContent> v) {
 262                 return v && v->use() && v->frame_type() != VideoFrameType::THREE_D_LEFT && v->frame_type() != VideoFrameType::THREE_D_RIGHT;
 263         };
 264
 265         for (auto i = _pieces.begin(); i != _pieces.end(); ++i) {
 266                 if (ignore_overlap((*i)->content->video)) {
 267                         /* Look for content later in the content list with in-use video that overlaps this */
 268                         auto const period = DCPTimePeriod((*i)->content->position(), (*i)->content->end(_film));
 269                         for (auto j = std::next(i); j != _pieces.end(); ++j) {
 270                                 if ((*j)->content->video && ignore_overlap((*j)->content->video)) {
 271                                         (*i)->ignore_video = DCPTimePeriod((*j)->content->position(), (*j)->content->end(_film)).overlap(period);
 272                                 }
 273                         }
 274                 }
 275         }
 276
 277         _black = EmptyVideo (_film, playlist(), _playback_length);
 278         _silent = EmptyAudio (_film, playlist(), _playback_length);
 279
 280         _next_video_time = boost::none;
 281         _next_video_eyes = Eyes::BOTH;
 282         _next_audio_time = boost::none;
 283 }
 284
 285
 286 void
 287 Player::playlist_content_change (ChangeType type, int property, bool frequent)
 288 {
 289         if (property == VideoContentProperty::CROP) {
 290                 if (type == ChangeType::DONE) {
 291                         auto const vcs = video_container_size();
 292                         boost::mutex::scoped_lock lm (_mutex);
 293                         for (auto const& i: _delay) {
 294                                 i.first->reset_metadata (_film, vcs);
 295                         }
 296                 }
 297         } else {
 298                 if (type == ChangeType::PENDING) {
 299                         /* The player content is probably about to change, so we can't carry on
 300                            until that has happened and we've rebuilt our pieces.  Stop pass()
 301                            and seek() from working until then.
 302                         */
 303                         ++_suspended;
 304                 } else if (type == ChangeType::DONE) {
 305                         /* A change in our content has gone through.  Re-build our pieces. */
 306                         setup_pieces ();
 307                         --_suspended;
 308                 } else if (type == ChangeType::CANCELLED) {
 309                         --_suspended;
 310                 }
 311         }
 312
 313         Change (type, property, frequent);
 314 }
 315
 316
 317 void
 318 Player::set_video_container_size (dcp::Size s)
 319 {
 320         Change (ChangeType::PENDING, PlayerProperty::VIDEO_CONTAINER_SIZE, false);
 321
 322         {
 323                 boost::mutex::scoped_lock lm (_mutex);
 324
 325                 if (s == _video_container_size) {
 326                         lm.unlock ();
 327                         Change (ChangeType::CANCELLED, PlayerProperty::VIDEO_CONTAINER_SIZE, false);
 328                         return;
 329                 }
 330
 331                 _video_container_size = s;
 332
 333                 _black_image = make_shared<Image>(AV_PIX_FMT_RGB24, _video_container_size, Image::Alignment::PADDED);
 334                 _black_image->make_black ();
 335         }
 336
 337         Change (ChangeType::DONE, PlayerProperty::VIDEO_CONTAINER_SIZE, false);
 338 }
 339
 340
 341 void
 342 Player::playlist_change (ChangeType type)
 343 {
 344         if (type == ChangeType::DONE) {
 345                 setup_pieces ();
 346         }
 347         Change (type, PlayerProperty::PLAYLIST, false);
 348 }
 349
 350
 351 void
 352 Player::film_change (ChangeType type, Film::Property p)
 353 {
 354         /* Here we should notice Film properties that affect our output, and
 355            alert listeners that our output now would be different to how it was
 356            last time we were run.
 357         */
 358
 359         if (p == Film::Property::CONTAINER) {
 360                 Change (type, PlayerProperty::FILM_CONTAINER, false);
 361         } else if (p == Film::Property::VIDEO_FRAME_RATE) {
 362                 /* Pieces contain a FrameRateChange which contains the DCP frame rate,
 363                    so we need new pieces here.
 364                 */
 365                 if (type == ChangeType::DONE) {
 366                         setup_pieces ();
 367                 }
 368                 Change (type, PlayerProperty::FILM_VIDEO_FRAME_RATE, false);
 369         } else if (p == Film::Property::AUDIO_PROCESSOR) {
 370                 if (type == ChangeType::DONE && _film->audio_processor ()) {
 371                         boost::mutex::scoped_lock lm (_mutex);
 372                         _audio_processor = _film->audio_processor()->clone (_film->audio_frame_rate ());
 373                 }
 374         } else if (p == Film::Property::AUDIO_CHANNELS) {
 375                 if (type == ChangeType::DONE) {
 376                         boost::mutex::scoped_lock lm (_mutex);
 377                         _audio_merger.clear ();
 378                 }
 379         }
 380 }
 381
 382
 383 shared_ptr<PlayerVideo>
 384 Player::black_player_video_frame (Eyes eyes) const
 385 {
 386         return std::make_shared<PlayerVideo> (
 387                 std::make_shared<const RawImageProxy>(_black_image),
 388                 Crop(),
 389                 optional<double>(),
 390                 _video_container_size,
 391                 _video_container_size,
 392                 eyes,
 393                 Part::WHOLE,
 394                 PresetColourConversion::all().front().conversion,
 395                 VideoRange::FULL,
 396                 std::weak_ptr<Content>(),
 397                 boost::optional<Frame>(),
 398                 false
 399         );
 400 }
 401
 402
 403 Frame
 404 Player::dcp_to_content_video (shared_ptr<const Piece> piece, DCPTime t) const
 405 {
 406         auto s = t - piece->content->position ();
 407         s = min (piece->content->length_after_trim(_film), s);
 408         s = max (DCPTime(), s + DCPTime (piece->content->trim_start(), piece->frc));
 409
 410         /* It might seem more logical here to convert s to a ContentTime (using the FrameRateChange)
 411            then convert that ContentTime to frames at the content's rate.  However this fails for
 412            situations like content at 29.9978733fps, DCP at 30fps.  The accuracy of the Time type is not
 413            enough to distinguish between the two with low values of time (e.g. 3200 in Time units).
 414
 415            Instead we convert the DCPTime using the DCP video rate then account for any skip/repeat.
 416         */
 417         return s.frames_floor (piece->frc.dcp) / piece->frc.factor ();
 418 }
 419
 420
 421 DCPTime
 422 Player::content_video_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 423 {
 424         /* See comment in dcp_to_content_video */
 425         auto const d = DCPTime::from_frames (f * piece->frc.factor(), piece->frc.dcp) - DCPTime(piece->content->trim_start(), piece->frc);
 426         return d + piece->content->position();
 427 }
 428
 429
 430 Frame
 431 Player::dcp_to_resampled_audio (shared_ptr<const Piece> piece, DCPTime t) const
 432 {
 433         auto s = t - piece->content->position ();
 434         s = min (piece->content->length_after_trim(_film), s);
 435         /* See notes in dcp_to_content_video */
 436         return max (DCPTime(), DCPTime(piece->content->trim_start(), piece->frc) + s).frames_floor(_film->audio_frame_rate());
 437 }
 438
 439
 440 DCPTime
 441 Player::resampled_audio_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 442 {
 443         /* See comment in dcp_to_content_video */
 444         return DCPTime::from_frames (f, _film->audio_frame_rate())
 445                 - DCPTime (piece->content->trim_start(), piece->frc)
 446                 + piece->content->position();
 447 }
 448
 449
 450 ContentTime
 451 Player::dcp_to_content_time (shared_ptr<const Piece> piece, DCPTime t) const
 452 {
 453         auto s = t - piece->content->position ();
 454         s = min (piece->content->length_after_trim(_film), s);
 455         return max (ContentTime (), ContentTime (s, piece->frc) + piece->content->trim_start());
 456 }
 457
 458
 459 DCPTime
 460 Player::content_time_to_dcp (shared_ptr<const Piece> piece, ContentTime t) const
 461 {
 462         return max (DCPTime(), DCPTime(t - piece->content->trim_start(), piece->frc) + piece->content->position());
 463 }
 464
 465
 466 vector<FontData>
 467 Player::get_subtitle_fonts ()
 468 {
 469         boost::mutex::scoped_lock lm (_mutex);
 470
 471         vector<FontData> fonts;
 472         for (auto i: _pieces) {
 473                 /* XXX: things may go wrong if there are duplicate font IDs
 474                    with different font files.
 475                 */
 476                 auto f = i->decoder->fonts ();
 477                 copy (f.begin(), f.end(), back_inserter(fonts));
 478         }
 479
 480         return fonts;
 481 }
 482
 483
 484 /** Set this player never to produce any video data */
 485 void
 486 Player::set_ignore_video ()
 487 {
 488         boost::mutex::scoped_lock lm (_mutex);
 489         _ignore_video = true;
 490         setup_pieces_unlocked ();
 491 }
 492
 493
 494 void
 495 Player::set_ignore_audio ()
 496 {
 497         boost::mutex::scoped_lock lm (_mutex);
 498         _ignore_audio = true;
 499         setup_pieces_unlocked ();
 500 }
 501
 502
 503 void
 504 Player::set_ignore_text ()
 505 {
 506         boost::mutex::scoped_lock lm (_mutex);
 507         _ignore_text = true;
 508         setup_pieces_unlocked ();
 509 }
 510
 511
 512 /** Set the player to always burn open texts into the image regardless of the content settings */
 513 void
 514 Player::set_always_burn_open_subtitles ()
 515 {
 516         boost::mutex::scoped_lock lm (_mutex);
 517         _always_burn_open_subtitles = true;
 518 }
 519
 520
 521 /** Sets up the player to be faster, possibly at the expense of quality */
 522 void
 523 Player::set_fast ()
 524 {
 525         boost::mutex::scoped_lock lm (_mutex);
 526         _fast = true;
 527         setup_pieces_unlocked ();
 528 }
 529
 530
 531 void
 532 Player::set_play_referenced ()
 533 {
 534         boost::mutex::scoped_lock lm (_mutex);
 535         _play_referenced = true;
 536         setup_pieces_unlocked ();
 537 }
 538
 539
 540 static void
 541 maybe_add_asset (list<ReferencedReelAsset>& a, shared_ptr<dcp::ReelAsset> r, Frame reel_trim_start, Frame reel_trim_end, DCPTime from, int const ffr)
 542 {
 543         DCPOMATIC_ASSERT (r);
 544         r->set_entry_point (r->entry_point().get_value_or(0) + reel_trim_start);
 545         r->set_duration (r->actual_duration() - reel_trim_start - reel_trim_end);
 546         if (r->actual_duration() > 0) {
 547                 a.push_back (
 548                         ReferencedReelAsset(r, DCPTimePeriod(from, from + DCPTime::from_frames(r->actual_duration(), ffr)))
 549                         );
 550         }
 551 }
 552
 553
 554 list<ReferencedReelAsset>
 555 Player::get_reel_assets ()
 556 {
 557         /* Does not require a lock on _mutex as it's only called from DCPEncoder */
 558
 559         list<ReferencedReelAsset> reel_assets;
 560
 561         for (auto content: playlist()->content()) {
 562                 auto dcp = dynamic_pointer_cast<DCPContent>(content);
 563                 if (!dcp) {
 564                         continue;
 565                 }
 566
 567                 if (!dcp->reference_video() && !dcp->reference_audio() && !dcp->reference_text(TextType::OPEN_SUBTITLE) && !dcp->reference_text(TextType::CLOSED_CAPTION)) {
 568                         continue;
 569                 }
 570
 571                 scoped_ptr<DCPDecoder> decoder;
 572                 try {
 573                         decoder.reset (new DCPDecoder(_film, dcp, false, false, shared_ptr<DCPDecoder>()));
 574                 } catch (...) {
 575                         return reel_assets;
 576                 }
 577
 578                 auto const frame_rate = _film->video_frame_rate();
 579                 DCPOMATIC_ASSERT (dcp->video_frame_rate());
 580                 /* We should only be referencing if the DCP rate is the same as the film rate */
 581                 DCPOMATIC_ASSERT (std::round(dcp->video_frame_rate().get()) == frame_rate);
 582
 583                 Frame const trim_start = dcp->trim_start().frames_round(frame_rate);
 584                 Frame const trim_end = dcp->trim_end().frames_round(frame_rate);
 585
 586                 /* position in the asset from the start */
 587                 int64_t offset_from_start = 0;
 588                 /* position i the asset from the end */
 589                 int64_t offset_from_end = 0;
 590                 for (auto reel: decoder->reels()) {
 591                         /* Assume that main picture duration is the length of the reel */
 592                         offset_from_end += reel->main_picture()->actual_duration();
 593                 }
 594
 595                 for (auto reel: decoder->reels()) {
 596
 597                         /* Assume that main picture duration is the length of the reel */
 598                         int64_t const reel_duration = reel->main_picture()->actual_duration();
 599
 600                         /* See doc/design/trim_reels.svg */
 601                         Frame const reel_trim_start = min(reel_duration, max(int64_t(0), trim_start - offset_from_start));
 602                         Frame const reel_trim_end =   min(reel_duration, max(int64_t(0), reel_duration - (offset_from_end - trim_end)));
 603
 604                         auto const from = max(DCPTime(), content->position() + DCPTime::from_frames(offset_from_start, frame_rate) - DCPTime::from_frames(trim_start, frame_rate));
 605                         if (dcp->reference_video()) {
 606                                 maybe_add_asset (reel_assets, reel->main_picture(), reel_trim_start, reel_trim_end, from, frame_rate);
 607                         }
 608
 609                         if (dcp->reference_audio()) {
 610                                 maybe_add_asset (reel_assets, reel->main_sound(), reel_trim_start, reel_trim_end, from, frame_rate);
 611                         }
 612
 613                         if (dcp->reference_text(TextType::OPEN_SUBTITLE)) {
 614                                 maybe_add_asset (reel_assets, reel->main_subtitle(), reel_trim_start, reel_trim_end, from, frame_rate);
 615                         }
 616
 617                         if (dcp->reference_text(TextType::CLOSED_CAPTION)) {
 618                                 for (auto caption: reel->closed_captions()) {
 619                                         maybe_add_asset (reel_assets, caption, reel_trim_start, reel_trim_end, from, frame_rate);
 620                                 }
 621                         }
 622
 623                         offset_from_start += reel_duration;
 624                         offset_from_end -= reel_duration;
 625                 }
 626         }
 627
 628         return reel_assets;
 629 }
 630
 631
 632 bool
 633 Player::pass ()
 634 {
 635         boost::mutex::scoped_lock lm (_mutex);
 636
 637         if (_suspended) {
 638                 /* We can't pass in this state */
 639                 LOG_DEBUG_PLAYER_NC ("Player is suspended");
 640                 return false;
 641         }
 642
 643         if (_playback_length == DCPTime()) {
 644                 /* Special; just give one black frame */
 645                 emit_video (black_player_video_frame(Eyes::BOTH), DCPTime());
 646                 return true;
 647         }
 648
 649         /* Find the decoder or empty which is farthest behind where we are and make it emit some data */
 650
 651         shared_ptr<Piece> earliest_content;
 652         optional<DCPTime> earliest_time;
 653
 654         for (auto i: _pieces) {
 655                 if (i->done) {
 656                         continue;
 657                 }
 658
 659                 auto const t = content_time_to_dcp (i, max(i->decoder->position(), i->content->trim_start()));
 660                 if (t > i->content->end(_film)) {
 661                         i->done = true;
 662                 } else {
 663
 664                         /* Given two choices at the same time, pick the one with texts so we see it before
 665                            the video.
 666                         */
 667                         if (!earliest_time || t < *earliest_time || (t == *earliest_time && !i->decoder->text.empty())) {
 668                                 earliest_time = t;
 669                                 earliest_content = i;
 670                         }
 671                 }
 672         }
 673
 674         bool done = false;
 675
 676         enum {
 677                 NONE,
 678                 CONTENT,
 679                 BLACK,
 680                 SILENT
 681         } which = NONE;
 682
 683         if (earliest_content) {
 684                 which = CONTENT;
 685         }
 686
 687         if (!_black.done() && !_ignore_video && (!earliest_time || _black.position() < *earliest_time)) {
 688                 earliest_time = _black.position ();
 689                 which = BLACK;
 690         }
 691
 692         if (!_silent.done() && !_ignore_audio && (!earliest_time || _silent.position() < *earliest_time)) {
 693                 earliest_time = _silent.position ();
 694                 which = SILENT;
 695         }
 696
 697         switch (which) {
 698         case CONTENT:
 699         {
 700                 LOG_DEBUG_PLAYER ("Calling pass() on %1", earliest_content->content->path(0));
 701                 earliest_content->done = earliest_content->decoder->pass ();
 702                 auto dcp = dynamic_pointer_cast<DCPContent>(earliest_content->content);
 703                 if (dcp && !_play_referenced && dcp->reference_audio()) {
 704                         /* We are skipping some referenced DCP audio content, so we need to update _next_audio_time
 705                            to `hide' the fact that no audio was emitted during the referenced DCP (though
 706                            we need to behave as though it was).
 707                         */
 708                         _next_audio_time = dcp->end (_film);
 709                 }
 710                 break;
 711         }
 712         case BLACK:
 713         {
 714                 LOG_DEBUG_PLAYER ("Emit black for gap at %1", to_string(_black.position()));
 715                 auto period = _black.period_at_position();
 716                 emit_video (black_player_video_frame(period.second), _black.position());
 717                 _black.set_position (_black.position() + one_video_frame());
 718                 break;
 719         }
 720         case SILENT:
 721         {
 722                 LOG_DEBUG_PLAYER ("Emit silence for gap at %1", to_string(_silent.position()));
 723                 DCPTimePeriod period (_silent.period_at_position());
 724                 if (_next_audio_time) {
 725                         /* Sometimes the thing that happened last finishes fractionally before
 726                            or after this silence.  Bodge the start time of the silence to fix it.
 727                            I think this is nothing to worry about since we will just add or
 728                            remove a little silence at the end of some content.
 729                         */
 730                         int64_t const error = labs(period.from.get() - _next_audio_time->get());
 731                         /* Let's not worry about less than a frame at 24fps */
 732                         int64_t const too_much_error = DCPTime::from_frames(1, 24).get();
 733                         if (error >= too_much_error) {
 734                                 _film->log()->log(String::compose("Silence starting before or after last audio by %1", error), LogEntry::TYPE_ERROR);
 735                         }
 736                         DCPOMATIC_ASSERT (error < too_much_error);
 737                         period.from = *_next_audio_time;
 738                 }
 739                 if (period.duration() > one_video_frame()) {
 740                         period.to = period.from + one_video_frame();
 741                 }
 742                 fill_audio (period);
 743                 _silent.set_position (period.to);
 744                 break;
 745         }
 746         case NONE:
 747                 done = true;
 748                 break;
 749         }
 750
 751         /* Emit any audio that is ready */
 752
 753         /* Work out the time before which the audio is definitely all here.  This is the earliest last_push_end of one
 754            of our streams, or the position of the _silent.  First, though we choose only streams that are less than
 755            ignore_streams_behind seconds behind the furthest ahead (we assume that if a stream has fallen that far
 756            behind it has finished).  This is so that we don't withhold audio indefinitely awaiting data from a stream
 757            that will never come, causing bugs like #2101.
 758         */
 759         constexpr int ignore_streams_behind = 5;
 760
 761         using state_pair = std::pair<AudioStreamPtr, StreamState>;
 762
 763         /* Find the 'leading' stream (i.e. the one that pushed data most recently) */
 764         auto latest_last_push_end = std::max_element(
 765                 _stream_states.begin(),
 766                 _stream_states.end(),
 767                 [](state_pair const& a, state_pair const& b) { return a.second.last_push_end < b.second.last_push_end; }
 768                 );
 769
 770         if (latest_last_push_end != _stream_states.end()) {
 771                 LOG_DEBUG_PLAYER("Leading stream is in %1 at %2", latest_last_push_end->second.piece->content->path(0), to_string(latest_last_push_end->second.last_push_end));
 772         }
 773
 774         /* Now make a list of those streams that are less than ignore_streams_behind behind the leader */
 775         std::map<AudioStreamPtr, StreamState> alive_stream_states;
 776         for (auto const& i: _stream_states) {
 777                 if ((latest_last_push_end->second.last_push_end - i.second.last_push_end) < dcpomatic::DCPTime::from_seconds(ignore_streams_behind)) {
 778                         alive_stream_states.insert(i);
 779                 } else {
 780                         LOG_DEBUG_PLAYER("Ignoring stream %1 because it is too far behind", i.second.piece->content->path(0));
 781                 }
 782         }
 783
 784         auto pull_to = _playback_length;
 785         for (auto const& i: alive_stream_states) {
 786                 if (!i.second.piece->done && i.second.last_push_end < pull_to) {
 787                         pull_to = i.second.last_push_end;
 788                 }
 789         }
 790         if (!_silent.done() && _silent.position() < pull_to) {
 791                 pull_to = _silent.position();
 792         }
 793
 794         LOG_DEBUG_PLAYER("Emitting audio up to %1", to_string(pull_to));
 795         auto audio = _audio_merger.pull (pull_to);
 796         for (auto i = audio.begin(); i != audio.end(); ++i) {
 797                 if (_next_audio_time && i->second < *_next_audio_time) {
 798                         /* This new data comes before the last we emitted (or the last seek); discard it */
 799                         auto cut = discard_audio (i->first, i->second, *_next_audio_time);
 800                         if (!cut.first) {
 801                                 continue;
 802                         }
 803                         *i = cut;
 804                 } else if (_next_audio_time && i->second > *_next_audio_time) {
 805                         /* There's a gap between this data and the last we emitted; fill with silence */
 806                         fill_audio (DCPTimePeriod (*_next_audio_time, i->second));
 807                 }
 808
 809                 emit_audio (i->first, i->second);
 810         }
 811
 812         if (done) {
 813                 if (_shuffler) {
 814                         _shuffler->flush ();
 815                 }
 816                 for (auto const& i: _delay) {
 817                         do_emit_video(i.first, i.second);
 818                 }
 819         }
 820
 821         return done;
 822 }
 823
 824
 825 /** @return Open subtitles for the frame at the given time, converted to images */
 826 optional<PositionImage>
 827 Player::open_subtitles_for_frame (DCPTime time) const
 828 {
 829         list<PositionImage> captions;
 830         int const vfr = _film->video_frame_rate();
 831
 832         for (
 833                 auto j:
 834                 _active_texts[static_cast<int>(TextType::OPEN_SUBTITLE)].get_burnt(DCPTimePeriod(time, time + DCPTime::from_frames(1, vfr)), _always_burn_open_subtitles)
 835                 ) {
 836
 837                 /* Bitmap subtitles */
 838                 for (auto i: j.bitmap) {
 839                         if (!i.image) {
 840                                 continue;
 841                         }
 842
 843                         /* i.image will already have been scaled to fit _video_container_size */
 844                         dcp::Size scaled_size (i.rectangle.width * _video_container_size.width, i.rectangle.height * _video_container_size.height);
 845
 846                         captions.push_back (
 847                                 PositionImage (
 848                                         i.image,
 849                                         Position<int> (
 850                                                 lrint(_video_container_size.width * i.rectangle.x),
 851                                                 lrint(_video_container_size.height * i.rectangle.y)
 852                                                 )
 853                                         )
 854                                 );
 855                 }
 856
 857                 /* String subtitles (rendered to an image) */
 858                 if (!j.string.empty()) {
 859                         auto s = render_text (j.string, j.fonts, _video_container_size, time, vfr);
 860                         copy (s.begin(), s.end(), back_inserter (captions));
 861                 }
 862         }
 863
 864         if (captions.empty()) {
 865                 return {};
 866         }
 867
 868         return merge (captions, _subtitle_alignment);
 869 }
 870
 871
 872 void
 873 Player::video (weak_ptr<Piece> weak_piece, ContentVideo video)
 874 {
 875         if (_suspended) {
 876                 return;
 877         }
 878
 879         auto piece = weak_piece.lock ();
 880         if (!piece) {
 881                 return;
 882         }
 883
 884         if (!piece->content->video->use()) {
 885                 return;
 886         }
 887
 888         FrameRateChange frc (_film, piece->content);
 889         if (frc.skip && (video.frame % 2) == 1) {
 890                 return;
 891         }
 892
 893         /* Time of the first frame we will emit */
 894         DCPTime const time = content_video_to_dcp (piece, video.frame);
 895         if (video.eyes == Eyes::BOTH) {
 896                 LOG_DEBUG_PLAYER("Received video frame %1 at %2", video.frame, to_string(time));
 897         } else {
 898                 LOG_DEBUG_PLAYER("Received video frame %1 %2 at %3", (video.eyes == Eyes::LEFT ? "L" : "R"), video.frame, to_string(time));
 899         }
 900
 901         /* Discard if it's before the content's period or the last accurate seek.  We can't discard
 902            if it's after the content's period here as in that case we still need to fill any gap between
 903            `now' and the end of the content's period.
 904         */
 905         if (time < piece->content->position() || (_next_video_time && time < *_next_video_time)) {
 906                 return;
 907         }
 908
 909         if (piece->ignore_video && piece->ignore_video->contains(time)) {
 910                 return;
 911         }
 912
 913         /* Fill gaps that we discover now that we have some video which needs to be emitted.
 914            This is where we need to fill to.
 915         */
 916         DCPTime fill_to = min (time, piece->content->end(_film));
 917
 918         if (_next_video_time) {
 919                 DCPTime fill_from = max (*_next_video_time, piece->content->position());
 920
 921                 /* Fill if we have more than half a frame to do */
 922                 if ((fill_to - fill_from) > one_video_frame() / 2) {
 923                         auto last = _last_video.find (weak_piece);
 924                         if (_film->three_d()) {
 925                                 auto fill_to_eyes = video.eyes;
 926                                 if (fill_to_eyes == Eyes::BOTH) {
 927                                         fill_to_eyes = Eyes::LEFT;
 928                                 }
 929                                 if (fill_to == piece->content->end(_film)) {
 930                                         /* Don't fill after the end of the content */
 931                                         fill_to_eyes = Eyes::LEFT;
 932                                 }
 933                                 auto j = fill_from;
 934                                 auto eyes = _next_video_eyes.get_value_or(Eyes::LEFT);
 935                                 if (eyes == Eyes::BOTH) {
 936                                         eyes = Eyes::LEFT;
 937                                 }
 938                                 while (j < fill_to || eyes != fill_to_eyes) {
 939                                         if (last != _last_video.end()) {
 940                                                 LOG_DEBUG_PLAYER("Fill using last video at %1 in 3D mode", to_string(j));
 941                                                 auto copy = last->second->shallow_copy();
 942                                                 copy->set_eyes (eyes);
 943                                                 emit_video (copy, j);
 944                                         } else {
 945                                                 LOG_DEBUG_PLAYER("Fill using black at %1 in 3D mode", to_string(j));
 946                                                 emit_video (black_player_video_frame(eyes), j);
 947                                         }
 948                                         if (eyes == Eyes::RIGHT) {
 949                                                 j += one_video_frame();
 950                                         }
 951                                         eyes = increment_eyes (eyes);
 952                                 }
 953                         } else {
 954                                 for (DCPTime j = fill_from; j < fill_to; j += one_video_frame()) {
 955                                         if (last != _last_video.end()) {
 956                                                 emit_video (last->second, j);
 957                                         } else {
 958                                                 emit_video (black_player_video_frame(Eyes::BOTH), j);
 959                                         }
 960                                 }
 961                         }
 962                 }
 963         }
 964
 965         auto const content_video = piece->content->video;
 966
 967         _last_video[weak_piece] = std::make_shared<PlayerVideo>(
 968                 video.image,
 969                 content_video->actual_crop(),
 970                 content_video->fade (_film, video.frame),
 971                 scale_for_display(
 972                         content_video->scaled_size(_film->frame_size()),
 973                         _video_container_size,
 974                         _film->frame_size(),
 975                         content_video->pixel_quanta()
 976                         ),
 977                 _video_container_size,
 978                 video.eyes,
 979                 video.part,
 980                 content_video->colour_conversion(),
 981                 content_video->range(),
 982                 piece->content,
 983                 video.frame,
 984                 false
 985                 );
 986
 987         DCPTime t = time;
 988         for (int i = 0; i < frc.repeat; ++i) {
 989                 if (t < piece->content->end(_film)) {
 990                         emit_video (_last_video[weak_piece], t);
 991                 }
 992                 t += one_video_frame ();
 993         }
 994 }
 995
 996
 997 void
 998 Player::audio (weak_ptr<Piece> weak_piece, AudioStreamPtr stream, ContentAudio content_audio)
 999 {
1000         if (_suspended) {
1001                 return;
1002         }
1003
1004         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
1005
1006         auto piece = weak_piece.lock ();
1007         if (!piece) {
1008                 return;
1009         }
1010
1011         auto content = piece->content->audio;
1012         DCPOMATIC_ASSERT (content);
1013
1014         int const rfr = content->resampled_frame_rate (_film);
1015
1016         /* Compute time in the DCP */
1017         auto time = resampled_audio_to_dcp (piece, content_audio.frame);
1018         LOG_DEBUG_PLAYER("Received audio frame %1 at %2", content_audio.frame, to_string(time));
1019
1020         /* And the end of this block in the DCP */
1021         auto end = time + DCPTime::from_frames(content_audio.audio->frames(), rfr);
1022
1023         /* Remove anything that comes before the start or after the end of the content */
1024         if (time < piece->content->position()) {
1025                 auto cut = discard_audio (content_audio.audio, time, piece->content->position());
1026                 if (!cut.first) {
1027                         /* This audio is entirely discarded */
1028                         return;
1029                 }
1030                 content_audio.audio = cut.first;
1031                 time = cut.second;
1032         } else if (time > piece->content->end(_film)) {
1033                 /* Discard it all */
1034                 return;
1035         } else if (end > piece->content->end(_film)) {
1036                 Frame const remaining_frames = DCPTime(piece->content->end(_film) - time).frames_round(rfr);
1037                 if (remaining_frames == 0) {
1038                         return;
1039                 }
1040                 content_audio.audio = make_shared<AudioBuffers>(content_audio.audio, remaining_frames, 0);
1041         }
1042
1043         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
1044
1045         /* Gain and fade */
1046
1047         auto const fade_coeffs = content->fade (stream, content_audio.frame, content_audio.audio->frames(), rfr);
1048         if (content->gain() != 0 || !fade_coeffs.empty()) {
1049                 auto gain_buffers = make_shared<AudioBuffers>(content_audio.audio);
1050                 if (!fade_coeffs.empty()) {
1051                         /* Apply both fade and gain */
1052                         DCPOMATIC_ASSERT (fade_coeffs.size() == static_cast<size_t>(gain_buffers->frames()));
1053                         auto const channels = gain_buffers->channels();
1054                         auto const frames = fade_coeffs.size();
1055                         auto data = gain_buffers->data();
1056                         auto const gain = db_to_linear (content->gain());
1057                         for (auto channel = 0; channel < channels; ++channel) {
1058                                 for (auto frame = 0U; frame < frames; ++frame) {
1059                                         data[channel][frame] *= gain * fade_coeffs[frame];
1060                                 }
1061                         }
1062                 } else {
1063                         /* Just apply gain */
1064                         gain_buffers->apply_gain (content->gain());
1065                 }
1066                 content_audio.audio = gain_buffers;
1067         }
1068
1069         /* Remap */
1070
1071         content_audio.audio = remap (content_audio.audio, _film->audio_channels(), stream->mapping());
1072
1073         /* Process */
1074
1075         if (_audio_processor) {
1076                 content_audio.audio = _audio_processor->run (content_audio.audio, _film->audio_channels ());
1077         }
1078
1079         /* Push */
1080
1081         _audio_merger.push (content_audio.audio, time);
1082         DCPOMATIC_ASSERT (_stream_states.find (stream) != _stream_states.end ());
1083         _stream_states[stream].last_push_end = time + DCPTime::from_frames (content_audio.audio->frames(), _film->audio_frame_rate());
1084 }
1085
1086
1087 void
1088 Player::bitmap_text_start (weak_ptr<Piece> weak_piece, weak_ptr<const TextContent> weak_content, ContentBitmapText subtitle)
1089 {
1090         if (_suspended) {
1091                 return;
1092         }
1093
1094         auto piece = weak_piece.lock ();
1095         auto content = weak_content.lock ();
1096         if (!piece || !content) {
1097                 return;
1098         }
1099
1100         PlayerText ps;
1101         for (auto& sub: subtitle.subs)
1102         {
1103                 /* Apply content's subtitle offsets */
1104                 sub.rectangle.x += content->x_offset ();
1105                 sub.rectangle.y += content->y_offset ();
1106
1107                 /* Apply a corrective translation to keep the subtitle centred after the scale that is coming up */
1108                 sub.rectangle.x -= sub.rectangle.width * ((content->x_scale() - 1) / 2);
1109                 sub.rectangle.y -= sub.rectangle.height * ((content->y_scale() - 1) / 2);
1110
1111                 /* Apply content's subtitle scale */
1112                 sub.rectangle.width *= content->x_scale ();
1113                 sub.rectangle.height *= content->y_scale ();
1114
1115                 auto image = sub.image;
1116
1117                 /* We will scale the subtitle up to fit _video_container_size */
1118                 int const width = sub.rectangle.width * _video_container_size.width;
1119                 int const height = sub.rectangle.height * _video_container_size.height;
1120                 if (width == 0 || height == 0) {
1121                         return;
1122                 }
1123
1124                 dcp::Size scaled_size (width, height);
1125                 ps.bitmap.push_back (BitmapText(image->scale(scaled_size, dcp::YUVToRGB::REC601, image->pixel_format(), Image::Alignment::PADDED, _fast), sub.rectangle));
1126         }
1127
1128         DCPTime from(content_time_to_dcp(piece, subtitle.from()));
1129         _active_texts[static_cast<int>(content->type())].add_from(weak_content, ps, from);
1130 }
1131
1132
1133 void
1134 Player::plain_text_start (weak_ptr<Piece> weak_piece, weak_ptr<const TextContent> weak_content, ContentStringText subtitle)
1135 {
1136         if (_suspended) {
1137                 return;
1138         }
1139
1140         auto piece = weak_piece.lock ();
1141         auto content = weak_content.lock ();
1142         if (!piece || !content) {
1143                 return;
1144         }
1145
1146         PlayerText ps;
1147         DCPTime const from (content_time_to_dcp (piece, subtitle.from()));
1148
1149         if (from > piece->content->end(_film)) {
1150                 return;
1151         }
1152
1153         for (auto s: subtitle.subs) {
1154                 s.set_h_position (s.h_position() + content->x_offset());
1155                 s.set_v_position (s.v_position() + content->y_offset());
1156                 float const xs = content->x_scale();
1157                 float const ys = content->y_scale();
1158                 float size = s.size();
1159
1160                 /* Adjust size to express the common part of the scaling;
1161                    e.g. if xs = ys = 0.5 we scale size by 2.
1162                 */
1163                 if (xs > 1e-5 && ys > 1e-5) {
1164                         size *= 1 / min (1 / xs, 1 / ys);
1165                 }
1166                 s.set_size (size);
1167
1168                 /* Then express aspect ratio changes */
1169                 if (fabs (1.0 - xs / ys) > dcp::ASPECT_ADJUST_EPSILON) {
1170                         s.set_aspect_adjust (xs / ys);
1171                 }
1172
1173                 s.set_in (dcp::Time(from.seconds(), 1000));
1174                 ps.string.push_back (StringText (s, content->outline_width()));
1175                 ps.add_fonts (content->fonts ());
1176         }
1177
1178         _active_texts[static_cast<int>(content->type())].add_from(weak_content, ps, from);
1179 }
1180
1181
1182 void
1183 Player::subtitle_stop (weak_ptr<Piece> weak_piece, weak_ptr<const TextContent> weak_content, ContentTime to)
1184 {
1185         if (_suspended) {
1186                 return;
1187         }
1188
1189         auto content = weak_content.lock ();
1190         if (!content) {
1191                 return;
1192         }
1193
1194         if (!_active_texts[static_cast<int>(content->type())].have(weak_content)) {
1195                 return;
1196         }
1197
1198         auto piece = weak_piece.lock ();
1199         if (!piece) {
1200                 return;
1201         }
1202
1203         DCPTime const dcp_to = content_time_to_dcp (piece, to);
1204
1205         if (dcp_to > piece->content->end(_film)) {
1206                 return;
1207         }
1208
1209         auto from = _active_texts[static_cast<int>(content->type())].add_to(weak_content, dcp_to);
1210
1211         bool const always = (content->type() == TextType::OPEN_SUBTITLE && _always_burn_open_subtitles);
1212         if (content->use() && !always && !content->burn()) {
1213                 Text (from.first, content->type(), content->dcp_track().get_value_or(DCPTextTrack()), DCPTimePeriod(from.second, dcp_to));
1214         }
1215 }
1216
1217
1218 void
1219 Player::seek (DCPTime time, bool accurate)
1220 {
1221         boost::mutex::scoped_lock lm (_mutex);
1222         LOG_DEBUG_PLAYER("Seek to %1 (%2accurate)", to_string(time), accurate ? "" : "in");
1223
1224         if (_suspended) {
1225                 /* We can't seek in this state */
1226                 return;
1227         }
1228
1229         if (_shuffler) {
1230                 _shuffler->clear ();
1231         }
1232
1233         _delay.clear ();
1234
1235         if (_audio_processor) {
1236                 _audio_processor->flush ();
1237         }
1238
1239         _audio_merger.clear ();
1240         for (int i = 0; i < static_cast<int>(TextType::COUNT); ++i) {
1241                 _active_texts[i].clear ();
1242         }
1243
1244         for (auto i: _pieces) {
1245                 if (time < i->content->position()) {
1246                         /* Before; seek to the start of the content.  Even if this request is for an inaccurate seek
1247                            we must seek this (following) content accurately, otherwise when we come to the end of the current
1248                            content we may not start right at the beginning of the next, causing a gap (if the next content has
1249                            been trimmed to a point between keyframes, or something).
1250                         */
1251                         i->decoder->seek (dcp_to_content_time (i, i->content->position()), true);
1252                         i->done = false;
1253                 } else if (i->content->position() <= time && time < i->content->end(_film)) {
1254                         /* During; seek to position */
1255                         i->decoder->seek (dcp_to_content_time (i, time), accurate);
1256                         i->done = false;
1257                 } else {
1258                         /* After; this piece is done */
1259                         i->done = true;
1260                 }
1261         }
1262
1263         if (accurate) {
1264                 _next_video_time = time;
1265                 _next_video_eyes = Eyes::LEFT;
1266                 _next_audio_time = time;
1267         } else {
1268                 _next_video_time = boost::none;
1269                 _next_video_eyes = boost::none;
1270                 _next_audio_time = boost::none;
1271         }
1272
1273         _black.set_position (time);
1274         _silent.set_position (time);
1275
1276         _last_video.clear ();
1277 }
1278
1279
1280 void
1281 Player::emit_video (shared_ptr<PlayerVideo> pv, DCPTime time)
1282 {
1283         if (!_film->three_d()) {
1284                 if (pv->eyes() == Eyes::LEFT) {
1285                         /* Use left-eye images for both eyes... */
1286                         pv->set_eyes (Eyes::BOTH);
1287                 } else if (pv->eyes() == Eyes::RIGHT) {
1288                         /* ...and discard the right */
1289                         return;
1290                 }
1291         }
1292
1293         /* We need a delay to give a little wiggle room to ensure that relevant subtitles arrive at the
1294            player before the video that requires them.
1295         */
1296         _delay.push_back (make_pair (pv, time));
1297
1298         if (pv->eyes() == Eyes::BOTH || pv->eyes() == Eyes::RIGHT) {
1299                 _next_video_time = time + one_video_frame();
1300         }
1301         _next_video_eyes = increment_eyes (pv->eyes());
1302
1303         if (_delay.size() < 3) {
1304                 return;
1305         }
1306
1307         auto to_do = _delay.front();
1308         _delay.pop_front();
1309         do_emit_video (to_do.first, to_do.second);
1310 }
1311
1312
1313 void
1314 Player::do_emit_video (shared_ptr<PlayerVideo> pv, DCPTime time)
1315 {
1316         if (pv->eyes() == Eyes::BOTH || pv->eyes() == Eyes::RIGHT) {
1317                 for (int i = 0; i < static_cast<int>(TextType::COUNT); ++i) {
1318                         _active_texts[i].clear_before (time);
1319                 }
1320         }
1321
1322         auto subtitles = open_subtitles_for_frame (time);
1323         if (subtitles) {
1324                 pv->set_text (subtitles.get ());
1325         }
1326
1327         LOG_DEBUG_PLAYER("Player --> Video %1 %2", to_string(time), static_cast<int>(pv->eyes()));
1328         Video (pv, time);
1329 }
1330
1331
1332 void
1333 Player::emit_audio (shared_ptr<AudioBuffers> data, DCPTime time)
1334 {
1335         /* Log if the assert below is about to fail */
1336         if (_next_audio_time && labs(time.get() - _next_audio_time->get()) > 1) {
1337                 _film->log()->log(String::compose("Out-of-sequence emit %1 vs %2", to_string(time), to_string(*_next_audio_time)), LogEntry::TYPE_WARNING);
1338         }
1339
1340         /* This audio must follow on from the previous, allowing for half a sample (at 48kHz) leeway */
1341         DCPOMATIC_ASSERT (!_next_audio_time || labs(time.get() - _next_audio_time->get()) < 2);
1342         Audio (data, time, _film->audio_frame_rate());
1343         _next_audio_time = time + DCPTime::from_frames (data->frames(), _film->audio_frame_rate());
1344 }
1345
1346
1347 void
1348 Player::fill_audio (DCPTimePeriod period)
1349 {
1350         if (period.from == period.to) {
1351                 return;
1352         }
1353
1354         DCPOMATIC_ASSERT (period.from < period.to);
1355
1356         DCPTime t = period.from;
1357         while (t < period.to) {
1358                 DCPTime block = min (DCPTime::from_seconds (0.5), period.to - t);
1359                 Frame const samples = block.frames_round(_film->audio_frame_rate());
1360                 if (samples) {
1361                         auto silence = make_shared<AudioBuffers>(_film->audio_channels(), samples);
1362                         silence->make_silent ();
1363                         emit_audio (silence, t);
1364                 }
1365                 t += block;
1366         }
1367 }
1368
1369
1370 DCPTime
1371 Player::one_video_frame () const
1372 {
1373         return DCPTime::from_frames (1, _film->video_frame_rate ());
1374 }
1375
1376
1377 pair<shared_ptr<AudioBuffers>, DCPTime>
1378 Player::discard_audio (shared_ptr<const AudioBuffers> audio, DCPTime time, DCPTime discard_to) const
1379 {
1380         auto const discard_time = discard_to - time;
1381         auto const discard_frames = discard_time.frames_round(_film->audio_frame_rate());
1382         auto remaining_frames = audio->frames() - discard_frames;
1383         if (remaining_frames <= 0) {
1384                 return make_pair(shared_ptr<AudioBuffers>(), DCPTime());
1385         }
1386         auto cut = make_shared<AudioBuffers>(audio, remaining_frames, discard_frames);
1387         return make_pair(cut, time + discard_time);
1388 }
1389
1390
1391 void
1392 Player::set_dcp_decode_reduction (optional<int> reduction)
1393 {
1394         Change (ChangeType::PENDING, PlayerProperty::DCP_DECODE_REDUCTION, false);
1395
1396         {
1397                 boost::mutex::scoped_lock lm (_mutex);
1398
1399                 if (reduction == _dcp_decode_reduction) {
1400                         lm.unlock ();
1401                         Change (ChangeType::CANCELLED, PlayerProperty::DCP_DECODE_REDUCTION, false);
1402                         return;
1403                 }
1404
1405                 _dcp_decode_reduction = reduction;
1406                 setup_pieces_unlocked ();
1407         }
1408
1409         Change (ChangeType::DONE, PlayerProperty::DCP_DECODE_REDUCTION, false);
1410 }
1411
1412
1413 optional<DCPTime>
1414 Player::content_time_to_dcp (shared_ptr<const Content> content, ContentTime t)
1415 {
1416         boost::mutex::scoped_lock lm (_mutex);
1417
1418         for (auto i: _pieces) {
1419                 if (i->content == content) {
1420                         return content_time_to_dcp (i, t);
1421                 }
1422         }
1423
1424         /* We couldn't find this content; perhaps things are being changed over */
1425         return {};
1426 }
1427
1428
1429 optional<ContentTime>
1430 Player::dcp_to_content_time (shared_ptr<const Content> content, DCPTime t)
1431 {
1432         boost::mutex::scoped_lock lm (_mutex);
1433
1434         for (auto i: _pieces) {
1435                 if (i->content == content) {
1436                         return dcp_to_content_time (i, t);
1437                 }
1438         }
1439
1440         /* We couldn't find this content; perhaps things are being changed over */
1441         return {};
1442 }
1443
1444
1445 shared_ptr<const Playlist>
1446 Player::playlist () const
1447 {
1448         return _playlist ? _playlist : _film->playlist();
1449 }
1450
1451
1452 void
1453 Player::atmos (weak_ptr<Piece> weak_piece, ContentAtmos data)
1454 {
1455         if (_suspended) {
1456                 return;
1457         }
1458
1459         auto piece = weak_piece.lock ();
1460         DCPOMATIC_ASSERT (piece);
1461
1462         auto const vfr = _film->video_frame_rate();
1463
1464         DCPTime const dcp_time = DCPTime::from_frames(data.frame, vfr) - DCPTime(piece->content->trim_start(), FrameRateChange(vfr, vfr));
1465         if (dcp_time < piece->content->position() || dcp_time >= (piece->content->end(_film))) {
1466                 return;
1467         }
1468
1469         Atmos (data.data, dcp_time, data.metadata);
1470 }
1471