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 "render_text.h"
  51 #include "shuffler.h"
  52 #include "text_content.h"
  53 #include "text_decoder.h"
  54 #include "timer.h"
  55 #include "video_decoder.h"
  56 #include <dcp/reel.h>
  57 #include <dcp/reel_closed_caption_asset.h>
  58 #include <dcp/reel_picture_asset.h>
  59 #include <dcp/reel_sound_asset.h>
  60 #include <dcp/reel_subtitle_asset.h>
  61 #include <algorithm>
  62 #include <iostream>
  63 #include <stdint.h>
  64
  65 #include "i18n.h"
  66
  67
  68 using std::copy;
  69 using std::cout;
  70 using std::dynamic_pointer_cast;
  71 using std::list;
  72 using std::make_pair;
  73 using std::make_shared;
  74 using std::make_shared;
  75 using std::max;
  76 using std::min;
  77 using std::min;
  78 using std::pair;
  79 using std::shared_ptr;
  80 using std::vector;
  81 using std::weak_ptr;
  82 using boost::optional;
  83 using boost::scoped_ptr;
  84 #if BOOST_VERSION >= 106100
  85 using namespace boost::placeholders;
  86 #endif
  87 using namespace dcpomatic;
  88
  89
  90 int const PlayerProperty::VIDEO_CONTAINER_SIZE = 700;
  91 int const PlayerProperty::PLAYLIST = 701;
  92 int const PlayerProperty::FILM_CONTAINER = 702;
  93 int const PlayerProperty::FILM_VIDEO_FRAME_RATE = 703;
  94 int const PlayerProperty::DCP_DECODE_REDUCTION = 704;
  95 int const PlayerProperty::PLAYBACK_LENGTH = 705;
  96 int const PlayerProperty::IGNORE_VIDEO = 706;
  97 int const PlayerProperty::IGNORE_AUDIO = 707;
  98 int const PlayerProperty::IGNORE_TEXT = 708;
  99 int const PlayerProperty::ALWAYS_BURN_OPEN_SUBTITLES = 709;
 100 int const PlayerProperty::PLAY_REFERENCED = 710;
 101
 102
 103 Player::Player (shared_ptr<const Film> film, Image::Alignment subtitle_alignment)
 104         : _film (film)
 105         , _suspended (0)
 106         , _ignore_video(false)
 107         , _ignore_audio(false)
 108         , _ignore_text(false)
 109         , _always_burn_open_subtitles(false)
 110         , _fast(false)
 111         , _tolerant (film->tolerant())
 112         , _play_referenced(false)
 113         , _audio_merger(film->audio_frame_rate())
 114         , _subtitle_alignment (subtitle_alignment)
 115 {
 116         construct ();
 117 }
 118
 119
 120 Player::Player (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist_)
 121         : _film (film)
 122         , _playlist (playlist_)
 123         , _suspended (0)
 124         , _ignore_video(false)
 125         , _ignore_audio(false)
 126         , _ignore_text(false)
 127         , _always_burn_open_subtitles(false)
 128         , _fast(false)
 129         , _tolerant (film->tolerant())
 130         , _play_referenced(false)
 131         , _audio_merger(film->audio_frame_rate())
 132 {
 133         construct ();
 134 }
 135
 136
 137 void
 138 Player::construct ()
 139 {
 140         auto film = _film.lock();
 141         DCPOMATIC_ASSERT(film);
 142
 143         connect();
 144         set_video_container_size(film->frame_size());
 145
 146         film_change (ChangeType::DONE, Film::Property::AUDIO_PROCESSOR);
 147
 148         setup_pieces ();
 149         seek (DCPTime (), true);
 150 }
 151
 152
 153 void
 154 Player::connect()
 155 {
 156         auto film = _film.lock();
 157         DCPOMATIC_ASSERT(film);
 158
 159         _film_changed_connection = film->Change.connect(bind(&Player::film_change, this, _1, _2));
 160         /* The butler must hear about this first, so since we are proxying this through to the butler we must
 161            be first.
 162         */
 163         _playlist_change_connection = playlist()->Change.connect (bind (&Player::playlist_change, this, _1), boost::signals2::at_front);
 164         _playlist_content_change_connection = playlist()->ContentChange.connect (bind(&Player::playlist_content_change, this, _1, _3, _4));
 165 }
 166
 167
 168 Player::Player(Player&& other)
 169         : _film(other._film)
 170         , _playlist(std::move(other._playlist))
 171         , _suspended(other._suspended.load())
 172         , _pieces(std::move(other._pieces))
 173         , _video_container_size(other._video_container_size.load())
 174         , _black_image(std::move(other._black_image))
 175         , _ignore_video(other._ignore_video.load())
 176         , _ignore_audio(other._ignore_audio.load())
 177         , _ignore_text(other._ignore_text.load())
 178         , _always_burn_open_subtitles(other._always_burn_open_subtitles.load())
 179         , _fast(other._fast.load())
 180         , _tolerant(other._tolerant)
 181         , _play_referenced(other._play_referenced.load())
 182         , _next_video_time(other._next_video_time)
 183         , _next_audio_time(other._next_audio_time)
 184         , _dcp_decode_reduction(other._dcp_decode_reduction.load())
 185         , _last_video(std::move(other._last_video))
 186         , _audio_merger(std::move(other._audio_merger))
 187         , _shuffler(std::move(other._shuffler))
 188         , _delay(std::move(other._delay))
 189         , _stream_states(std::move(other._stream_states))
 190         , _black(std::move(other._black))
 191         , _silent(std::move(other._silent))
 192         , _active_texts(std::move(other._active_texts))
 193         , _audio_processor(std::move(other._audio_processor))
 194         , _playback_length(other._playback_length.load())
 195         , _subtitle_alignment(other._subtitle_alignment)
 196 {
 197         connect();
 198 }
 199
 200
 201 Player&
 202 Player::operator=(Player&& other)
 203 {
 204         if (this == &other) {
 205                 return *this;
 206         }
 207
 208         _film = std::move(other._film);
 209         _playlist = std::move(other._playlist);
 210         _suspended = other._suspended.load();
 211         _pieces = std::move(other._pieces);
 212         _video_container_size = other._video_container_size.load();
 213         _black_image = std::move(other._black_image);
 214         _ignore_video = other._ignore_video.load();
 215         _ignore_audio = other._ignore_audio.load();
 216         _ignore_text = other._ignore_text.load();
 217         _always_burn_open_subtitles = other._always_burn_open_subtitles.load();
 218         _fast = other._fast.load();
 219         _tolerant = other._tolerant;
 220         _play_referenced = other._play_referenced.load();
 221         _next_video_time = other._next_video_time;
 222         _next_audio_time = other._next_audio_time;
 223         _dcp_decode_reduction = other._dcp_decode_reduction.load();
 224         _last_video = std::move(other._last_video);
 225         _audio_merger = std::move(other._audio_merger);
 226         _shuffler = std::move(other._shuffler);
 227         _delay = std::move(other._delay);
 228         _stream_states = std::move(other._stream_states);
 229         _black = std::move(other._black);
 230         _silent = std::move(other._silent);
 231         _active_texts = std::move(other._active_texts);
 232         _audio_processor = std::move(other._audio_processor);
 233         _playback_length = other._playback_length.load();
 234         _subtitle_alignment = other._subtitle_alignment;
 235
 236         connect();
 237
 238         return *this;
 239 }
 240
 241
 242 bool
 243 have_video (shared_ptr<const Content> content)
 244 {
 245         return static_cast<bool>(content->video) && content->video->use() && content->can_be_played();
 246 }
 247
 248
 249 bool
 250 have_audio (shared_ptr<const Content> content)
 251 {
 252         return static_cast<bool>(content->audio) && content->can_be_played();
 253 }
 254
 255
 256 void
 257 Player::setup_pieces ()
 258 {
 259         boost::mutex::scoped_lock lm (_mutex);
 260
 261         auto old_pieces = _pieces;
 262         _pieces.clear ();
 263
 264         auto film = _film.lock();
 265         if (!film) {
 266                 return;
 267         }
 268
 269         _playback_length = _playlist ? _playlist->length(film) : film->length();
 270
 271         auto playlist_content = playlist()->content();
 272         bool const have_threed = std::any_of(
 273                 playlist_content.begin(),
 274                 playlist_content.end(),
 275                 [](shared_ptr<const Content> c) {
 276                         return c->video && (c->video->frame_type() == VideoFrameType::THREE_D_LEFT || c->video->frame_type() == VideoFrameType::THREE_D_RIGHT);
 277                 });
 278
 279
 280         if (have_threed) {
 281                 _shuffler.reset(new Shuffler());
 282                 _shuffler->Video.connect(bind(&Player::video, this, _1, _2));
 283         }
 284
 285         for (auto content: playlist()->content()) {
 286
 287                 if (!content->paths_valid()) {
 288                         continue;
 289                 }
 290
 291                 if (_ignore_video && _ignore_audio && content->text.empty()) {
 292                         /* We're only interested in text and this content has none */
 293                         continue;
 294                 }
 295
 296                 shared_ptr<Decoder> old_decoder;
 297                 for (auto j: old_pieces) {
 298                         if (j->content == content) {
 299                                 old_decoder = j->decoder;
 300                                 break;
 301                         }
 302                 }
 303
 304                 auto decoder = decoder_factory(film, content, _fast, _tolerant, old_decoder);
 305                 DCPOMATIC_ASSERT (decoder);
 306
 307                 FrameRateChange frc(film, content);
 308
 309                 if (decoder->video && _ignore_video) {
 310                         decoder->video->set_ignore (true);
 311                 }
 312
 313                 if (decoder->audio && _ignore_audio) {
 314                         decoder->audio->set_ignore (true);
 315                 }
 316
 317                 if (_ignore_text) {
 318                         for (auto i: decoder->text) {
 319                                 i->set_ignore (true);
 320                         }
 321                 }
 322
 323                 auto dcp = dynamic_pointer_cast<DCPDecoder> (decoder);
 324                 if (dcp) {
 325                         dcp->set_decode_referenced (_play_referenced);
 326                         if (_play_referenced) {
 327                                 dcp->set_forced_reduction (_dcp_decode_reduction);
 328                         }
 329                 }
 330
 331                 auto piece = make_shared<Piece>(content, decoder, frc);
 332                 _pieces.push_back (piece);
 333
 334                 if (decoder->video) {
 335                         if (have_threed) {
 336                                 /* We need a Shuffler to cope with 3D L/R video data arriving out of sequence */
 337                                 decoder->video->Data.connect (bind(&Shuffler::video, _shuffler.get(), weak_ptr<Piece>(piece), _1));
 338                         } else {
 339                                 decoder->video->Data.connect (bind(&Player::video, this, weak_ptr<Piece>(piece), _1));
 340                         }
 341                 }
 342
 343                 if (decoder->audio) {
 344                         decoder->audio->Data.connect (bind (&Player::audio, this, weak_ptr<Piece> (piece), _1, _2));
 345                 }
 346
 347                 auto j = decoder->text.begin();
 348
 349                 while (j != decoder->text.end()) {
 350                         (*j)->BitmapStart.connect (
 351                                 bind(&Player::bitmap_text_start, this, weak_ptr<Piece>(piece), weak_ptr<const TextContent>((*j)->content()), _1)
 352                                 );
 353                         (*j)->PlainStart.connect (
 354                                 bind(&Player::plain_text_start, this, weak_ptr<Piece>(piece), weak_ptr<const TextContent>((*j)->content()), _1)
 355                                 );
 356                         (*j)->Stop.connect (
 357                                 bind(&Player::subtitle_stop, this, weak_ptr<Piece>(piece), weak_ptr<const TextContent>((*j)->content()), _1)
 358                                 );
 359
 360                         ++j;
 361                 }
 362
 363                 if (decoder->atmos) {
 364                         decoder->atmos->Data.connect (bind(&Player::atmos, this, weak_ptr<Piece>(piece), _1));
 365                 }
 366         }
 367
 368         _stream_states.clear ();
 369         for (auto i: _pieces) {
 370                 if (i->content->audio) {
 371                         for (auto j: i->content->audio->streams()) {
 372                                 _stream_states[j] = StreamState(i);
 373                         }
 374                 }
 375         }
 376
 377         auto ignore_overlap = [](shared_ptr<VideoContent> v) {
 378                 return v && v->use() && v->frame_type() != VideoFrameType::THREE_D_LEFT && v->frame_type() != VideoFrameType::THREE_D_RIGHT;
 379         };
 380
 381         for (auto i = _pieces.begin(); i != _pieces.end(); ++i) {
 382                 if (ignore_overlap((*i)->content->video)) {
 383                         /* Look for content later in the content list with in-use video that overlaps this */
 384                         auto const period = DCPTimePeriod((*i)->content->position(), (*i)->content->end(film));
 385                         for (auto j = std::next(i); j != _pieces.end(); ++j) {
 386                                 if ((*j)->content->video && ignore_overlap((*j)->content->video)) {
 387                                         (*i)->ignore_video = DCPTimePeriod((*j)->content->position(), (*j)->content->end(film)).overlap(period);
 388                                 }
 389                         }
 390                 }
 391         }
 392
 393         _black = Empty(film, playlist(), bind(&have_video, _1), _playback_length);
 394         _silent = Empty(film, playlist(), bind(&have_audio, _1), _playback_length);
 395
 396         _next_video_time = boost::none;
 397         _next_video_eyes = Eyes::BOTH;
 398         _next_audio_time = boost::none;
 399 }
 400
 401
 402 void
 403 Player::playlist_content_change (ChangeType type, int property, bool frequent)
 404 {
 405         auto film = _film.lock();
 406         if (!film) {
 407                 return;
 408         }
 409
 410         if (property == VideoContentProperty::CROP) {
 411                 if (type == ChangeType::DONE) {
 412                         boost::mutex::scoped_lock lm (_mutex);
 413                         for (auto const& i: _delay) {
 414                                 i.first->reset_metadata(film, _video_container_size);
 415                         }
 416                 }
 417         } else {
 418                 if (type == ChangeType::PENDING) {
 419                         /* The player content is probably about to change, so we can't carry on
 420                            until that has happened and we've rebuilt our pieces.  Stop pass()
 421                            and seek() from working until then.
 422                         */
 423                         ++_suspended;
 424                 } else if (type == ChangeType::DONE) {
 425                         /* A change in our content has gone through.  Re-build our pieces. */
 426                         setup_pieces ();
 427                         --_suspended;
 428                 } else if (type == ChangeType::CANCELLED) {
 429                         --_suspended;
 430                 }
 431         }
 432
 433         Change (type, property, frequent);
 434 }
 435
 436
 437 void
 438 Player::set_video_container_size (dcp::Size s)
 439 {
 440         ChangeSignaller<Player, int> cc(this, PlayerProperty::VIDEO_CONTAINER_SIZE);
 441
 442         if (s == _video_container_size) {
 443                 cc.abort();
 444                 return;
 445         }
 446
 447         _video_container_size = s;
 448
 449         {
 450                 boost::mutex::scoped_lock lm(_black_image_mutex);
 451                 _black_image = make_shared<Image>(AV_PIX_FMT_RGB24, _video_container_size, Image::Alignment::PADDED);
 452                 _black_image->make_black ();
 453         }
 454 }
 455
 456
 457 void
 458 Player::playlist_change (ChangeType type)
 459 {
 460         if (type == ChangeType::DONE) {
 461                 setup_pieces ();
 462         }
 463         Change (type, PlayerProperty::PLAYLIST, false);
 464 }
 465
 466
 467 void
 468 Player::film_change (ChangeType type, Film::Property p)
 469 {
 470         /* Here we should notice Film properties that affect our output, and
 471            alert listeners that our output now would be different to how it was
 472            last time we were run.
 473         */
 474
 475         auto film = _film.lock();
 476         if (!film) {
 477                 return;
 478         }
 479
 480         if (p == Film::Property::CONTAINER) {
 481                 Change (type, PlayerProperty::FILM_CONTAINER, false);
 482         } else if (p == Film::Property::VIDEO_FRAME_RATE) {
 483                 /* Pieces contain a FrameRateChange which contains the DCP frame rate,
 484                    so we need new pieces here.
 485                 */
 486                 if (type == ChangeType::DONE) {
 487                         setup_pieces ();
 488                 }
 489                 Change (type, PlayerProperty::FILM_VIDEO_FRAME_RATE, false);
 490         } else if (p == Film::Property::AUDIO_PROCESSOR) {
 491                 if (type == ChangeType::DONE && film->audio_processor ()) {
 492                         boost::mutex::scoped_lock lm (_mutex);
 493                         _audio_processor = film->audio_processor()->clone(film->audio_frame_rate());
 494                 }
 495         } else if (p == Film::Property::AUDIO_CHANNELS) {
 496                 if (type == ChangeType::DONE) {
 497                         boost::mutex::scoped_lock lm (_mutex);
 498                         _audio_merger.clear ();
 499                 }
 500         }
 501 }
 502
 503
 504 shared_ptr<PlayerVideo>
 505 Player::black_player_video_frame (Eyes eyes) const
 506 {
 507         boost::mutex::scoped_lock lm(_black_image_mutex);
 508
 509         return std::make_shared<PlayerVideo> (
 510                 std::make_shared<const RawImageProxy>(_black_image),
 511                 Crop(),
 512                 optional<double>(),
 513                 _video_container_size,
 514                 _video_container_size,
 515                 eyes,
 516                 Part::WHOLE,
 517                 PresetColourConversion::all().front().conversion,
 518                 VideoRange::FULL,
 519                 std::weak_ptr<Content>(),
 520                 boost::optional<Frame>(),
 521                 false
 522         );
 523 }
 524
 525
 526 Frame
 527 Player::dcp_to_content_video (shared_ptr<const Piece> piece, DCPTime t) const
 528 {
 529         auto film = _film.lock();
 530         DCPOMATIC_ASSERT(film);
 531
 532         auto s = t - piece->content->position ();
 533         s = min (piece->content->length_after_trim(film), s);
 534         s = max (DCPTime(), s + DCPTime (piece->content->trim_start(), piece->frc));
 535
 536         /* It might seem more logical here to convert s to a ContentTime (using the FrameRateChange)
 537            then convert that ContentTime to frames at the content's rate.  However this fails for
 538            situations like content at 29.9978733fps, DCP at 30fps.  The accuracy of the Time type is not
 539            enough to distinguish between the two with low values of time (e.g. 3200 in Time units).
 540
 541            Instead we convert the DCPTime using the DCP video rate then account for any skip/repeat.
 542         */
 543         return s.frames_floor (piece->frc.dcp) / piece->frc.factor ();
 544 }
 545
 546
 547 DCPTime
 548 Player::content_video_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 549 {
 550         /* See comment in dcp_to_content_video */
 551         auto const d = DCPTime::from_frames (f * piece->frc.factor(), piece->frc.dcp) - DCPTime(piece->content->trim_start(), piece->frc);
 552         return d + piece->content->position();
 553 }
 554
 555
 556 Frame
 557 Player::dcp_to_resampled_audio (shared_ptr<const Piece> piece, DCPTime t) const
 558 {
 559         auto film = _film.lock();
 560         DCPOMATIC_ASSERT(film);
 561
 562         auto s = t - piece->content->position ();
 563         s = min (piece->content->length_after_trim(film), s);
 564         /* See notes in dcp_to_content_video */
 565         return max (DCPTime(), DCPTime(piece->content->trim_start(), piece->frc) + s).frames_floor(film->audio_frame_rate());
 566 }
 567
 568
 569 DCPTime
 570 Player::resampled_audio_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 571 {
 572         auto film = _film.lock();
 573         DCPOMATIC_ASSERT(film);
 574
 575         /* See comment in dcp_to_content_video */
 576         return DCPTime::from_frames(f, film->audio_frame_rate())
 577                 - DCPTime (piece->content->trim_start(), piece->frc)
 578                 + piece->content->position();
 579 }
 580
 581
 582 ContentTime
 583 Player::dcp_to_content_time (shared_ptr<const Piece> piece, DCPTime t) const
 584 {
 585         auto film = _film.lock();
 586         DCPOMATIC_ASSERT(film);
 587
 588         auto s = t - piece->content->position ();
 589         s = min (piece->content->length_after_trim(film), s);
 590         return max (ContentTime (), ContentTime (s, piece->frc) + piece->content->trim_start());
 591 }
 592
 593
 594 DCPTime
 595 Player::content_time_to_dcp (shared_ptr<const Piece> piece, ContentTime t) const
 596 {
 597         return max (DCPTime(), DCPTime(t - piece->content->trim_start(), piece->frc) + piece->content->position());
 598 }
 599
 600
 601 vector<shared_ptr<Font>>
 602 Player::get_subtitle_fonts ()
 603 {
 604         boost::mutex::scoped_lock lm (_mutex);
 605
 606         vector<shared_ptr<Font>> fonts;
 607         for (auto piece: _pieces) {
 608                 for (auto text: piece->content->text) {
 609                         auto text_fonts = text->fonts();
 610                         copy (text_fonts.begin(), text_fonts.end(), back_inserter(fonts));
 611                 }
 612         }
 613
 614         return fonts;
 615 }
 616
 617
 618 /** Set this player never to produce any video data */
 619 void
 620 Player::set_ignore_video ()
 621 {
 622         ChangeSignaller<Player, int> cc(this, PlayerProperty::IGNORE_VIDEO);
 623         _ignore_video = true;
 624         setup_pieces();
 625 }
 626
 627
 628 void
 629 Player::set_ignore_audio ()
 630 {
 631         ChangeSignaller<Player, int> cc(this, PlayerProperty::IGNORE_AUDIO);
 632         _ignore_audio = true;
 633         setup_pieces();
 634 }
 635
 636
 637 void
 638 Player::set_ignore_text ()
 639 {
 640         ChangeSignaller<Player, int> cc(this, PlayerProperty::IGNORE_TEXT);
 641         _ignore_text = true;
 642         setup_pieces();
 643 }
 644
 645
 646 /** Set the player to always burn open texts into the image regardless of the content settings */
 647 void
 648 Player::set_always_burn_open_subtitles ()
 649 {
 650         ChangeSignaller<Player, int> cc(this, PlayerProperty::ALWAYS_BURN_OPEN_SUBTITLES);
 651         _always_burn_open_subtitles = true;
 652 }
 653
 654
 655 /** Sets up the player to be faster, possibly at the expense of quality */
 656 void
 657 Player::set_fast ()
 658 {
 659         _fast = true;
 660         setup_pieces();
 661 }
 662
 663
 664 void
 665 Player::set_play_referenced ()
 666 {
 667         ChangeSignaller<Player, int> cc(this, PlayerProperty::PLAY_REFERENCED);
 668         _play_referenced = true;
 669         setup_pieces();
 670 }
 671
 672
 673 bool
 674 Player::pass ()
 675 {
 676         boost::mutex::scoped_lock lm (_mutex);
 677
 678         if (_suspended) {
 679                 /* We can't pass in this state */
 680                 LOG_DEBUG_PLAYER_NC ("Player is suspended");
 681                 return false;
 682         }
 683
 684         auto film = _film.lock();
 685
 686         if (_playback_length.load() == DCPTime() || !film) {
 687                 /* Special; just give one black frame */
 688                 emit_video (black_player_video_frame(Eyes::BOTH), DCPTime());
 689                 return true;
 690         }
 691
 692         /* Find the decoder or empty which is farthest behind where we are and make it emit some data */
 693
 694         shared_ptr<Piece> earliest_content;
 695         optional<DCPTime> earliest_time;
 696
 697         for (auto i: _pieces) {
 698                 if (i->done) {
 699                         continue;
 700                 }
 701
 702                 auto const t = content_time_to_dcp (i, max(i->decoder->position(), i->content->trim_start()));
 703                 if (t > i->content->end(film)) {
 704                         i->done = true;
 705                 } else {
 706
 707                         /* Given two choices at the same time, pick the one with texts so we see it before
 708                            the video.
 709                         */
 710                         if (!earliest_time || t < *earliest_time || (t == *earliest_time && !i->decoder->text.empty())) {
 711                                 earliest_time = t;
 712                                 earliest_content = i;
 713                         }
 714                 }
 715         }
 716
 717         bool done = false;
 718
 719         enum {
 720                 NONE,
 721                 CONTENT,
 722                 BLACK,
 723                 SILENT
 724         } which = NONE;
 725
 726         if (earliest_content) {
 727                 which = CONTENT;
 728         }
 729
 730         if (!_black.done() && !_ignore_video && (!earliest_time || _black.position() < *earliest_time)) {
 731                 earliest_time = _black.position ();
 732                 which = BLACK;
 733         }
 734
 735         if (!_silent.done() && !_ignore_audio && (!earliest_time || _silent.position() < *earliest_time)) {
 736                 earliest_time = _silent.position ();
 737                 which = SILENT;
 738         }
 739
 740         switch (which) {
 741         case CONTENT:
 742         {
 743                 LOG_DEBUG_PLAYER ("Calling pass() on %1", earliest_content->content->path(0));
 744                 earliest_content->done = earliest_content->decoder->pass ();
 745                 auto dcp = dynamic_pointer_cast<DCPContent>(earliest_content->content);
 746                 if (dcp && !_play_referenced && dcp->reference_audio()) {
 747                         /* We are skipping some referenced DCP audio content, so we need to update _next_audio_time
 748                            to `hide' the fact that no audio was emitted during the referenced DCP (though
 749                            we need to behave as though it was).
 750                         */
 751                         _next_audio_time = dcp->end(film);
 752                 }
 753                 break;
 754         }
 755         case BLACK:
 756                 LOG_DEBUG_PLAYER ("Emit black for gap at %1", to_string(_black.position()));
 757                 emit_video (black_player_video_frame(Eyes::BOTH), _black.position());
 758                 _black.set_position (_black.position() + one_video_frame());
 759                 break;
 760         case SILENT:
 761         {
 762                 LOG_DEBUG_PLAYER ("Emit silence for gap at %1", to_string(_silent.position()));
 763                 DCPTimePeriod period (_silent.period_at_position());
 764                 if (_next_audio_time) {
 765                         /* Sometimes the thing that happened last finishes fractionally before
 766                            or after this silence.  Bodge the start time of the silence to fix it.
 767                            I think this is nothing to worry about since we will just add or
 768                            remove a little silence at the end of some content.
 769                         */
 770                         int64_t const error = labs(period.from.get() - _next_audio_time->get());
 771                         /* Let's not worry about less than a frame at 24fps */
 772                         int64_t const too_much_error = DCPTime::from_frames(1, 24).get();
 773                         if (error >= too_much_error) {
 774                                 film->log()->log(String::compose("Silence starting before or after last audio by %1", error), LogEntry::TYPE_ERROR);
 775                         }
 776                         DCPOMATIC_ASSERT (error < too_much_error);
 777                         period.from = *_next_audio_time;
 778                 }
 779                 if (period.duration() > one_video_frame()) {
 780                         period.to = period.from + one_video_frame();
 781                 }
 782                 fill_audio (period);
 783                 _silent.set_position (period.to);
 784                 break;
 785         }
 786         case NONE:
 787                 done = true;
 788                 break;
 789         }
 790
 791         /* Emit any audio that is ready */
 792
 793         /* Work out the time before which the audio is definitely all here.  This is the earliest last_push_end of one
 794            of our streams, or the position of the _silent.  First, though we choose only streams that are less than
 795            ignore_streams_behind seconds behind the furthest ahead (we assume that if a stream has fallen that far
 796            behind it has finished).  This is so that we don't withhold audio indefinitely awaiting data from a stream
 797            that will never come, causing bugs like #2101.
 798         */
 799         constexpr int ignore_streams_behind = 5;
 800
 801         using state_pair = std::pair<AudioStreamPtr, StreamState>;
 802
 803         /* Find streams that have pushed */
 804         std::vector<state_pair> have_pushed;
 805         std::copy_if(_stream_states.begin(), _stream_states.end(), std::back_inserter(have_pushed), [](state_pair const& a) { return static_cast<bool>(a.second.last_push_end); });
 806
 807         /* Find the 'leading' stream (i.e. the one that pushed data most recently) */
 808         auto latest_last_push_end = std::max_element(
 809                 have_pushed.begin(),
 810                 have_pushed.end(),
 811                 [](state_pair const& a, state_pair const& b) { return a.second.last_push_end.get() < b.second.last_push_end.get(); }
 812                 );
 813
 814         if (latest_last_push_end != have_pushed.end()) {
 815                 LOG_DEBUG_PLAYER("Leading audio 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.get()));
 816         }
 817
 818         /* Now make a list of those streams that are less than ignore_streams_behind behind the leader */
 819         std::map<AudioStreamPtr, StreamState> alive_stream_states;
 820         for (auto const& i: _stream_states) {
 821                 if (!i.second.last_push_end || (latest_last_push_end->second.last_push_end.get() - i.second.last_push_end.get()) < dcpomatic::DCPTime::from_seconds(ignore_streams_behind)) {
 822                         alive_stream_states.insert(i);
 823                 } else {
 824                         LOG_DEBUG_PLAYER("Ignoring stream %1 because it is too far behind", i.second.piece->content->path(0));
 825                 }
 826         }
 827
 828         auto pull_to = _playback_length.load();
 829         for (auto const& i: alive_stream_states) {
 830                 auto position = i.second.last_push_end.get_value_or(i.second.piece->content->position());
 831                 if (!i.second.piece->done && position < pull_to) {
 832                         pull_to = position;
 833                 }
 834         }
 835         if (!_silent.done() && _silent.position() < pull_to) {
 836                 pull_to = _silent.position();
 837         }
 838
 839         LOG_DEBUG_PLAYER("Emitting audio up to %1", to_string(pull_to));
 840         auto audio = _audio_merger.pull (pull_to);
 841         for (auto i = audio.begin(); i != audio.end(); ++i) {
 842                 if (_next_audio_time && i->second < *_next_audio_time) {
 843                         /* This new data comes before the last we emitted (or the last seek); discard it */
 844                         auto cut = discard_audio (i->first, i->second, *_next_audio_time);
 845                         if (!cut.first) {
 846                                 continue;
 847                         }
 848                         *i = cut;
 849                 } else if (_next_audio_time && i->second > *_next_audio_time) {
 850                         /* There's a gap between this data and the last we emitted; fill with silence */
 851                         fill_audio (DCPTimePeriod (*_next_audio_time, i->second));
 852                 }
 853
 854                 emit_audio (i->first, i->second);
 855         }
 856
 857         if (done) {
 858                 if (_shuffler) {
 859                         _shuffler->flush ();
 860                 }
 861                 for (auto const& i: _delay) {
 862                         do_emit_video(i.first, i.second);
 863                 }
 864
 865                 /* Perhaps we should have Empty entries for both eyes in the 3D case (somehow).
 866                  * However, if we have L and R video files, and one is shorter than the other,
 867                  * the fill code in ::video mostly takes care of filling in the gaps.
 868                  * However, since it fills at the point when it knows there is more video coming
 869                  * at time t (so it should fill any gap up to t) it can't do anything right at the
 870                  * end.  This is particularly bad news if the last frame emitted is a LEFT
 871                  * eye, as the MXF writer will complain about the 3D sequence being wrong.
 872                  * Here's a hack to workaround that particular case.
 873                  */
 874                 if (_next_video_eyes && _next_video_time && *_next_video_eyes == Eyes::RIGHT) {
 875                         do_emit_video (black_player_video_frame(Eyes::RIGHT), *_next_video_time);
 876                 }
 877         }
 878
 879         return done;
 880 }
 881
 882
 883 /** @return Open subtitles for the frame at the given time, converted to images */
 884 optional<PositionImage>
 885 Player::open_subtitles_for_frame (DCPTime time) const
 886 {
 887         auto film = _film.lock();
 888         if (!film) {
 889                 return {};
 890         }
 891
 892         list<PositionImage> captions;
 893         int const vfr = film->video_frame_rate();
 894
 895         for (
 896                 auto j:
 897                 _active_texts[TextType::OPEN_SUBTITLE].get_burnt(DCPTimePeriod(time, time + DCPTime::from_frames(1, vfr)), _always_burn_open_subtitles)
 898                 ) {
 899
 900                 /* Bitmap subtitles */
 901                 for (auto i: j.bitmap) {
 902                         if (!i.image) {
 903                                 continue;
 904                         }
 905
 906                         /* i.image will already have been scaled to fit _video_container_size */
 907                         dcp::Size scaled_size (i.rectangle.width * _video_container_size.load().width, i.rectangle.height * _video_container_size.load().height);
 908
 909                         captions.push_back (
 910                                 PositionImage (
 911                                         i.image,
 912                                         Position<int> (
 913                                                 lrint(_video_container_size.load().width * i.rectangle.x),
 914                                                 lrint(_video_container_size.load().height * i.rectangle.y)
 915                                                 )
 916                                         )
 917                                 );
 918                 }
 919
 920                 /* String subtitles (rendered to an image) */
 921                 if (!j.string.empty()) {
 922                         auto s = render_text(j.string, _video_container_size, time, vfr);
 923                         copy (s.begin(), s.end(), back_inserter (captions));
 924                 }
 925         }
 926
 927         if (captions.empty()) {
 928                 return {};
 929         }
 930
 931         return merge (captions, _subtitle_alignment);
 932 }
 933
 934
 935 void
 936 Player::video (weak_ptr<Piece> weak_piece, ContentVideo video)
 937 {
 938         if (_suspended) {
 939                 return;
 940         }
 941
 942         auto piece = weak_piece.lock ();
 943         if (!piece) {
 944                 return;
 945         }
 946
 947         if (!piece->content->video->use()) {
 948                 return;
 949         }
 950
 951         auto film = _film.lock();
 952         if (!film) {
 953                 return;
 954         }
 955
 956         FrameRateChange frc(film, piece->content);
 957         if (frc.skip && (video.frame % 2) == 1) {
 958                 return;
 959         }
 960
 961         /* Time of the first frame we will emit */
 962         DCPTime const time = content_video_to_dcp (piece, video.frame);
 963         LOG_DEBUG_PLAYER("Received video frame %1 at %2", video.frame, to_string(time));
 964
 965         /* Discard if it's before the content's period or the last accurate seek.  We can't discard
 966            if it's after the content's period here as in that case we still need to fill any gap between
 967            `now' and the end of the content's period.
 968         */
 969         if (time < piece->content->position() || (_next_video_time && time < *_next_video_time)) {
 970                 return;
 971         }
 972
 973         if (piece->ignore_video && piece->ignore_video->contains(time)) {
 974                 return;
 975         }
 976
 977         /* Fill gaps that we discover now that we have some video which needs to be emitted.
 978            This is where we need to fill to.
 979         */
 980         DCPTime fill_to = min(time, piece->content->end(film));
 981
 982         if (_next_video_time) {
 983                 DCPTime fill_from = max (*_next_video_time, piece->content->position());
 984
 985                 /* Fill if we have more than half a frame to do */
 986                 if ((fill_to - fill_from) > one_video_frame() / 2) {
 987                         auto last = _last_video.find (weak_piece);
 988                         if (film->three_d()) {
 989                                 auto fill_to_eyes = video.eyes;
 990                                 if (fill_to_eyes == Eyes::BOTH) {
 991                                         fill_to_eyes = Eyes::LEFT;
 992                                 }
 993                                 if (fill_to == piece->content->end(film)) {
 994                                         /* Don't fill after the end of the content */
 995                                         fill_to_eyes = Eyes::LEFT;
 996                                 }
 997                                 auto j = fill_from;
 998                                 auto eyes = _next_video_eyes.get_value_or(Eyes::LEFT);
 999                                 if (eyes == Eyes::BOTH) {
1000                                         eyes = Eyes::LEFT;
1001                                 }
1002                                 while (j < fill_to || eyes != fill_to_eyes) {
1003                                         if (last != _last_video.end()) {
1004                                                 LOG_DEBUG_PLAYER("Fill using last video at %1 in 3D mode", to_string(j));
1005                                                 auto copy = last->second->shallow_copy();
1006                                                 copy->set_eyes (eyes);
1007                                                 emit_video (copy, j);
1008                                         } else {
1009                                                 LOG_DEBUG_PLAYER("Fill using black at %1 in 3D mode", to_string(j));
1010                                                 emit_video (black_player_video_frame(eyes), j);
1011                                         }
1012                                         if (eyes == Eyes::RIGHT) {
1013                                                 j += one_video_frame();
1014                                         }
1015                                         eyes = increment_eyes (eyes);
1016                                 }
1017                         } else {
1018                                 for (DCPTime j = fill_from; j < fill_to; j += one_video_frame()) {
1019                                         if (last != _last_video.end()) {
1020                                                 emit_video (last->second, j);
1021                                         } else {
1022                                                 emit_video (black_player_video_frame(Eyes::BOTH), j);
1023                                         }
1024                                 }
1025                         }
1026                 }
1027         }
1028
1029         auto const content_video = piece->content->video;
1030
1031         _last_video[weak_piece] = std::make_shared<PlayerVideo>(
1032                 video.image,
1033                 content_video->actual_crop(),
1034                 content_video->fade(film, video.frame),
1035                 scale_for_display(
1036                         content_video->scaled_size(film->frame_size()),
1037                         _video_container_size,
1038                         film->frame_size(),
1039                         content_video->pixel_quanta()
1040                         ),
1041                 _video_container_size,
1042                 video.eyes,
1043                 video.part,
1044                 content_video->colour_conversion(),
1045                 content_video->range(),
1046                 piece->content,
1047                 video.frame,
1048                 false
1049                 );
1050
1051         DCPTime t = time;
1052         for (int i = 0; i < frc.repeat; ++i) {
1053                 if (t < piece->content->end(film)) {
1054                         emit_video (_last_video[weak_piece], t);
1055                 }
1056                 t += one_video_frame ();
1057         }
1058 }
1059
1060
1061 void
1062 Player::audio (weak_ptr<Piece> weak_piece, AudioStreamPtr stream, ContentAudio content_audio)
1063 {
1064         if (_suspended) {
1065                 return;
1066         }
1067
1068         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
1069
1070         auto piece = weak_piece.lock ();
1071         if (!piece) {
1072                 return;
1073         }
1074
1075         auto film = _film.lock();
1076         if (!film) {
1077                 return;
1078         }
1079
1080         auto content = piece->content->audio;
1081         DCPOMATIC_ASSERT (content);
1082
1083         int const rfr = content->resampled_frame_rate(film);
1084
1085         /* Compute time in the DCP */
1086         auto time = resampled_audio_to_dcp (piece, content_audio.frame);
1087
1088         /* And the end of this block in the DCP */
1089         auto end = time + DCPTime::from_frames(content_audio.audio->frames(), rfr);
1090         LOG_DEBUG_PLAYER("Received audio frame %1 covering %2 to %3 (%4)", content_audio.frame, to_string(time), to_string(end), piece->content->path(0).filename());
1091
1092         /* Remove anything that comes before the start or after the end of the content */
1093         if (time < piece->content->position()) {
1094                 auto cut = discard_audio (content_audio.audio, time, piece->content->position());
1095                 if (!cut.first) {
1096                         /* This audio is entirely discarded */
1097                         return;
1098                 }
1099                 content_audio.audio = cut.first;
1100                 time = cut.second;
1101         } else if (time > piece->content->end(film)) {
1102                 /* Discard it all */
1103                 return;
1104         } else if (end > piece->content->end(film)) {
1105                 Frame const remaining_frames = DCPTime(piece->content->end(film) - time).frames_round(rfr);
1106                 if (remaining_frames == 0) {
1107                         return;
1108                 }
1109                 content_audio.audio = make_shared<AudioBuffers>(content_audio.audio, remaining_frames, 0);
1110         }
1111
1112         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
1113
1114         /* Gain and fade */
1115
1116         auto const fade_coeffs = content->fade (stream, content_audio.frame, content_audio.audio->frames(), rfr);
1117         if (content->gain() != 0 || !fade_coeffs.empty()) {
1118                 auto gain_buffers = make_shared<AudioBuffers>(content_audio.audio);
1119                 if (!fade_coeffs.empty()) {
1120                         /* Apply both fade and gain */
1121                         DCPOMATIC_ASSERT (fade_coeffs.size() == static_cast<size_t>(gain_buffers->frames()));
1122                         auto const channels = gain_buffers->channels();
1123                         auto const frames = fade_coeffs.size();
1124                         auto data = gain_buffers->data();
1125                         auto const gain = db_to_linear (content->gain());
1126                         for (auto channel = 0; channel < channels; ++channel) {
1127                                 for (auto frame = 0U; frame < frames; ++frame) {
1128                                         data[channel][frame] *= gain * fade_coeffs[frame];
1129                                 }
1130                         }
1131                 } else {
1132                         /* Just apply gain */
1133                         gain_buffers->apply_gain (content->gain());
1134                 }
1135                 content_audio.audio = gain_buffers;
1136         }
1137
1138         /* Remap */
1139
1140         content_audio.audio = remap(content_audio.audio, film->audio_channels(), stream->mapping());
1141
1142         /* Process */
1143
1144         if (_audio_processor) {
1145                 content_audio.audio = _audio_processor->run(content_audio.audio, film->audio_channels());
1146         }
1147
1148         /* Push */
1149
1150         _audio_merger.push (content_audio.audio, time);
1151         DCPOMATIC_ASSERT (_stream_states.find (stream) != _stream_states.end ());
1152         _stream_states[stream].last_push_end = time + DCPTime::from_frames(content_audio.audio->frames(), film->audio_frame_rate());
1153 }
1154
1155
1156 void
1157 Player::bitmap_text_start (weak_ptr<Piece> weak_piece, weak_ptr<const TextContent> weak_content, ContentBitmapText subtitle)
1158 {
1159         if (_suspended) {
1160                 return;
1161         }
1162
1163         auto piece = weak_piece.lock ();
1164         auto content = weak_content.lock ();
1165         if (!piece || !content) {
1166                 return;
1167         }
1168
1169         PlayerText ps;
1170         for (auto& sub: subtitle.subs)
1171         {
1172                 /* Apply content's subtitle offsets */
1173                 sub.rectangle.x += content->x_offset ();
1174                 sub.rectangle.y += content->y_offset ();
1175
1176                 /* Apply a corrective translation to keep the subtitle centred after the scale that is coming up */
1177                 sub.rectangle.x -= sub.rectangle.width * ((content->x_scale() - 1) / 2);
1178                 sub.rectangle.y -= sub.rectangle.height * ((content->y_scale() - 1) / 2);
1179
1180                 /* Apply content's subtitle scale */
1181                 sub.rectangle.width *= content->x_scale ();
1182                 sub.rectangle.height *= content->y_scale ();
1183
1184                 auto image = sub.image;
1185
1186                 /* We will scale the subtitle up to fit _video_container_size */
1187                 int const width = sub.rectangle.width * _video_container_size.load().width;
1188                 int const height = sub.rectangle.height * _video_container_size.load().height;
1189                 if (width == 0 || height == 0) {
1190                         return;
1191                 }
1192
1193                 dcp::Size scaled_size (width, height);
1194                 ps.bitmap.push_back (BitmapText(image->scale(scaled_size, dcp::YUVToRGB::REC601, image->pixel_format(), Image::Alignment::PADDED, _fast), sub.rectangle));
1195         }
1196
1197         DCPTime from(content_time_to_dcp(piece, subtitle.from()));
1198         _active_texts[content->type()].add_from(weak_content, ps, from);
1199 }
1200
1201
1202 void
1203 Player::plain_text_start (weak_ptr<Piece> weak_piece, weak_ptr<const TextContent> weak_content, ContentStringText subtitle)
1204 {
1205         if (_suspended) {
1206                 return;
1207         }
1208
1209         auto piece = weak_piece.lock ();
1210         auto content = weak_content.lock ();
1211         auto film = _film.lock();
1212         if (!piece || !content || !film) {
1213                 return;
1214         }
1215
1216         PlayerText ps;
1217         DCPTime const from (content_time_to_dcp (piece, subtitle.from()));
1218
1219         if (from > piece->content->end(film)) {
1220                 return;
1221         }
1222
1223         for (auto s: subtitle.subs) {
1224                 s.set_h_position (s.h_position() + content->x_offset());
1225                 s.set_v_position (s.v_position() + content->y_offset());
1226                 float const xs = content->x_scale();
1227                 float const ys = content->y_scale();
1228                 float size = s.size();
1229
1230                 /* Adjust size to express the common part of the scaling;
1231                    e.g. if xs = ys = 0.5 we scale size by 2.
1232                 */
1233                 if (xs > 1e-5 && ys > 1e-5) {
1234                         size *= 1 / min (1 / xs, 1 / ys);
1235                 }
1236                 s.set_size (size);
1237
1238                 /* Then express aspect ratio changes */
1239                 if (fabs (1.0 - xs / ys) > dcp::ASPECT_ADJUST_EPSILON) {
1240                         s.set_aspect_adjust (xs / ys);
1241                 }
1242
1243                 s.set_in (dcp::Time(from.seconds(), 1000));
1244                 ps.string.push_back (s);
1245         }
1246
1247         _active_texts[content->type()].add_from(weak_content, ps, from);
1248 }
1249
1250
1251 void
1252 Player::subtitle_stop (weak_ptr<Piece> weak_piece, weak_ptr<const TextContent> weak_content, ContentTime to)
1253 {
1254         if (_suspended) {
1255                 return;
1256         }
1257
1258         auto content = weak_content.lock ();
1259         if (!content) {
1260                 return;
1261         }
1262
1263         if (!_active_texts[content->type()].have(weak_content)) {
1264                 return;
1265         }
1266
1267         auto piece = weak_piece.lock ();
1268         auto film = _film.lock();
1269         if (!piece || !film) {
1270                 return;
1271         }
1272
1273         DCPTime const dcp_to = content_time_to_dcp (piece, to);
1274
1275         if (dcp_to > piece->content->end(film)) {
1276                 return;
1277         }
1278
1279         auto from = _active_texts[content->type()].add_to(weak_content, dcp_to);
1280
1281         bool const always = (content->type() == TextType::OPEN_SUBTITLE && _always_burn_open_subtitles);
1282         if (content->use() && !always && !content->burn()) {
1283                 Text (from.first, content->type(), content->dcp_track().get_value_or(DCPTextTrack()), DCPTimePeriod(from.second, dcp_to));
1284         }
1285 }
1286
1287
1288 void
1289 Player::seek (DCPTime time, bool accurate)
1290 {
1291         boost::mutex::scoped_lock lm (_mutex);
1292         LOG_DEBUG_PLAYER("Seek to %1 (%2accurate)", to_string(time), accurate ? "" : "in");
1293
1294         if (_suspended) {
1295                 /* We can't seek in this state */
1296                 return;
1297         }
1298
1299         auto film = _film.lock();
1300         if (!film) {
1301                 return;
1302         }
1303
1304         if (_shuffler) {
1305                 _shuffler->clear ();
1306         }
1307
1308         _delay.clear ();
1309
1310         if (_audio_processor) {
1311                 _audio_processor->flush ();
1312         }
1313
1314         _audio_merger.clear ();
1315         std::for_each(_active_texts.begin(), _active_texts.end(), [](ActiveText& a) { a.clear(); });
1316
1317         for (auto i: _pieces) {
1318                 if (time < i->content->position()) {
1319                         /* Before; seek to the start of the content.  Even if this request is for an inaccurate seek
1320                            we must seek this (following) content accurately, otherwise when we come to the end of the current
1321                            content we may not start right at the beginning of the next, causing a gap (if the next content has
1322                            been trimmed to a point between keyframes, or something).
1323                         */
1324                         i->decoder->seek (dcp_to_content_time (i, i->content->position()), true);
1325                         i->done = false;
1326                 } else if (i->content->position() <= time && time < i->content->end(film)) {
1327                         /* During; seek to position */
1328                         i->decoder->seek (dcp_to_content_time (i, time), accurate);
1329                         i->done = false;
1330                 } else {
1331                         /* After; this piece is done */
1332                         i->done = true;
1333                 }
1334         }
1335
1336         if (accurate) {
1337                 _next_video_time = time;
1338                 _next_video_eyes = Eyes::LEFT;
1339                 _next_audio_time = time;
1340         } else {
1341                 _next_video_time = boost::none;
1342                 _next_video_eyes = boost::none;
1343                 _next_audio_time = boost::none;
1344         }
1345
1346         _black.set_position (time);
1347         _silent.set_position (time);
1348
1349         _last_video.clear ();
1350
1351         for (auto& state: _stream_states) {
1352                 state.second.last_push_end = {};
1353         }
1354 }
1355
1356
1357 void
1358 Player::emit_video (shared_ptr<PlayerVideo> pv, DCPTime time)
1359 {
1360         auto film = _film.lock();
1361         DCPOMATIC_ASSERT(film);
1362
1363         if (!film->three_d()) {
1364                 if (pv->eyes() == Eyes::LEFT) {
1365                         /* Use left-eye images for both eyes... */
1366                         pv->set_eyes (Eyes::BOTH);
1367                 } else if (pv->eyes() == Eyes::RIGHT) {
1368                         /* ...and discard the right */
1369                         return;
1370                 }
1371         }
1372
1373         /* We need a delay to give a little wiggle room to ensure that relevant subtitles arrive at the
1374            player before the video that requires them.
1375         */
1376         _delay.push_back (make_pair (pv, time));
1377
1378         if (pv->eyes() == Eyes::BOTH || pv->eyes() == Eyes::RIGHT) {
1379                 _next_video_time = time + one_video_frame();
1380         }
1381         _next_video_eyes = increment_eyes (pv->eyes());
1382
1383         if (_delay.size() < 3) {
1384                 return;
1385         }
1386
1387         auto to_do = _delay.front();
1388         _delay.pop_front();
1389         do_emit_video (to_do.first, to_do.second);
1390 }
1391
1392
1393 void
1394 Player::do_emit_video (shared_ptr<PlayerVideo> pv, DCPTime time)
1395 {
1396         if (pv->eyes() == Eyes::BOTH || pv->eyes() == Eyes::RIGHT) {
1397                 std::for_each(_active_texts.begin(), _active_texts.end(), [time](ActiveText& a) { a.clear_before(time); });
1398         }
1399
1400         auto subtitles = open_subtitles_for_frame (time);
1401         if (subtitles) {
1402                 pv->set_text (subtitles.get ());
1403         }
1404
1405         Video (pv, time);
1406 }
1407
1408
1409 void
1410 Player::emit_audio (shared_ptr<AudioBuffers> data, DCPTime time)
1411 {
1412         auto film = _film.lock();
1413         DCPOMATIC_ASSERT(film);
1414
1415         /* Log if the assert below is about to fail */
1416         if (_next_audio_time && labs(time.get() - _next_audio_time->get()) > 1) {
1417                 film->log()->log(String::compose("Out-of-sequence emit %1 vs %2", to_string(time), to_string(*_next_audio_time)), LogEntry::TYPE_WARNING);
1418         }
1419
1420         /* This audio must follow on from the previous, allowing for half a sample (at 48kHz) leeway */
1421         DCPOMATIC_ASSERT (!_next_audio_time || labs(time.get() - _next_audio_time->get()) < 2);
1422         Audio(data, time, film->audio_frame_rate());
1423         _next_audio_time = time + DCPTime::from_frames(data->frames(), film->audio_frame_rate());
1424 }
1425
1426
1427 void
1428 Player::fill_audio (DCPTimePeriod period)
1429 {
1430         auto film = _film.lock();
1431         DCPOMATIC_ASSERT(film);
1432
1433         if (period.from == period.to) {
1434                 return;
1435         }
1436
1437         DCPOMATIC_ASSERT (period.from < period.to);
1438
1439         DCPTime t = period.from;
1440         while (t < period.to) {
1441                 DCPTime block = min (DCPTime::from_seconds (0.5), period.to - t);
1442                 Frame const samples = block.frames_round(film->audio_frame_rate());
1443                 if (samples) {
1444                         auto silence = make_shared<AudioBuffers>(film->audio_channels(), samples);
1445                         silence->make_silent ();
1446                         emit_audio (silence, t);
1447                 }
1448                 t += block;
1449         }
1450 }
1451
1452
1453 DCPTime
1454 Player::one_video_frame () const
1455 {
1456         auto film = _film.lock();
1457         DCPOMATIC_ASSERT(film);
1458
1459         return DCPTime::from_frames(1, film->video_frame_rate ());
1460 }
1461
1462
1463 pair<shared_ptr<AudioBuffers>, DCPTime>
1464 Player::discard_audio (shared_ptr<const AudioBuffers> audio, DCPTime time, DCPTime discard_to) const
1465 {
1466         auto film = _film.lock();
1467         DCPOMATIC_ASSERT(film);
1468
1469         auto const discard_time = discard_to - time;
1470         auto const discard_frames = discard_time.frames_round(film->audio_frame_rate());
1471         auto remaining_frames = audio->frames() - discard_frames;
1472         if (remaining_frames <= 0) {
1473                 return make_pair(shared_ptr<AudioBuffers>(), DCPTime());
1474         }
1475         auto cut = make_shared<AudioBuffers>(audio, remaining_frames, discard_frames);
1476         return make_pair(cut, time + discard_time);
1477 }
1478
1479
1480 void
1481 Player::set_dcp_decode_reduction (optional<int> reduction)
1482 {
1483         ChangeSignaller<Player, int> cc(this, PlayerProperty::DCP_DECODE_REDUCTION);
1484
1485         if (reduction == _dcp_decode_reduction.load()) {
1486                 cc.abort();
1487                 return;
1488         }
1489
1490         _dcp_decode_reduction = reduction;
1491         setup_pieces();
1492 }
1493
1494
1495 optional<DCPTime>
1496 Player::content_time_to_dcp (shared_ptr<const Content> content, ContentTime t) const
1497 {
1498         boost::mutex::scoped_lock lm (_mutex);
1499
1500         for (auto i: _pieces) {
1501                 if (i->content == content) {
1502                         return content_time_to_dcp (i, t);
1503                 }
1504         }
1505
1506         /* We couldn't find this content; perhaps things are being changed over */
1507         return {};
1508 }
1509
1510
1511 optional<ContentTime>
1512 Player::dcp_to_content_time (shared_ptr<const Content> content, DCPTime t) const
1513 {
1514         boost::mutex::scoped_lock lm (_mutex);
1515
1516         for (auto i: _pieces) {
1517                 if (i->content == content) {
1518                         return dcp_to_content_time (i, t);
1519                 }
1520         }
1521
1522         /* We couldn't find this content; perhaps things are being changed over */
1523         return {};
1524 }
1525
1526
1527 shared_ptr<const Playlist>
1528 Player::playlist () const
1529 {
1530         auto film = _film.lock();
1531         if (!film) {
1532                 return {};
1533         }
1534
1535         return _playlist ? _playlist : film->playlist();
1536 }
1537
1538
1539 void
1540 Player::atmos (weak_ptr<Piece> weak_piece, ContentAtmos data)
1541 {
1542         if (_suspended) {
1543                 return;
1544         }
1545
1546         auto film = _film.lock();
1547         DCPOMATIC_ASSERT(film);
1548
1549         auto piece = weak_piece.lock ();
1550         DCPOMATIC_ASSERT (piece);
1551
1552         auto const vfr = film->video_frame_rate();
1553
1554         DCPTime const dcp_time = DCPTime::from_frames(data.frame, vfr) - DCPTime(piece->content->trim_start(), FrameRateChange(vfr, vfr));
1555         if (dcp_time < piece->content->position() || dcp_time >= (piece->content->end(film))) {
1556                 return;
1557         }
1558
1559         Atmos (data.data, dcp_time, data.metadata);
1560 }
1561
1562
1563 void
1564 Player::signal_change(ChangeType type, int property)
1565 {
1566         Change(type, property, false);
1567 }
1568