src/lib/player.cc

   1 /*
   2     Copyright (C) 2013-2018 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 #include "player.h"
  22 #include "film.h"
  23 #include "audio_buffers.h"
  24 #include "content_audio.h"
  25 #include "dcp_content.h"
  26 #include "job.h"
  27 #include "image.h"
  28 #include "raw_image_proxy.h"
  29 #include "ratio.h"
  30 #include "log.h"
  31 #include "render_subtitles.h"
  32 #include "config.h"
  33 #include "content_video.h"
  34 #include "player_video.h"
  35 #include "frame_rate_change.h"
  36 #include "audio_processor.h"
  37 #include "playlist.h"
  38 #include "referenced_reel_asset.h"
  39 #include "decoder_factory.h"
  40 #include "decoder.h"
  41 #include "video_decoder.h"
  42 #include "audio_decoder.h"
  43 #include "subtitle_content.h"
  44 #include "subtitle_decoder.h"
  45 #include "ffmpeg_content.h"
  46 #include "audio_content.h"
  47 #include "content_subtitle.h"
  48 #include "dcp_decoder.h"
  49 #include "image_decoder.h"
  50 #include "compose.hpp"
  51 #include "shuffler.h"
  52 #include <dcp/reel.h>
  53 #include <dcp/reel_sound_asset.h>
  54 #include <dcp/reel_subtitle_asset.h>
  55 #include <dcp/reel_picture_asset.h>
  56 #include <boost/foreach.hpp>
  57 #include <stdint.h>
  58 #include <algorithm>
  59 #include <iostream>
  60
  61 #include "i18n.h"
  62
  63 #define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), LogEntry::TYPE_GENERAL);
  64
  65 using std::list;
  66 using std::cout;
  67 using std::min;
  68 using std::max;
  69 using std::min;
  70 using std::vector;
  71 using std::pair;
  72 using std::map;
  73 using std::make_pair;
  74 using std::copy;
  75 using boost::shared_ptr;
  76 using boost::weak_ptr;
  77 using boost::dynamic_pointer_cast;
  78 using boost::optional;
  79 using boost::scoped_ptr;
  80
  81 Player::Player (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
  82         : _film (film)
  83         , _playlist (playlist)
  84         , _have_valid_pieces (false)
  85         , _ignore_video (false)
  86         , _ignore_subtitle (false)
  87         , _always_burn_subtitles (false)
  88         , _fast (false)
  89         , _play_referenced (false)
  90         , _audio_merger (_film->audio_frame_rate())
  91         , _shuffler (0)
  92 {
  93         _film_changed_connection = _film->Changed.connect (bind (&Player::film_changed, this, _1));
  94         _playlist_changed_connection = _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  95         _playlist_content_changed_connection = _playlist->ContentChanged.connect (bind (&Player::playlist_content_changed, this, _1, _2, _3));
  96         set_video_container_size (_film->frame_size ());
  97
  98         film_changed (Film::AUDIO_PROCESSOR);
  99
 100         seek (DCPTime (), true);
 101 }
 102
 103 Player::~Player ()
 104 {
 105         delete _shuffler;
 106 }
 107
 108 void
 109 Player::setup_pieces ()
 110 {
 111         _pieces.clear ();
 112
 113         delete _shuffler;
 114         _shuffler = new Shuffler();
 115         _shuffler->Video.connect(bind(&Player::video, this, _1, _2));
 116
 117         BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
 118
 119                 if (!i->paths_valid ()) {
 120                         continue;
 121                 }
 122
 123                 shared_ptr<Decoder> decoder = decoder_factory (i, _film->log(), _fast);
 124                 FrameRateChange frc (i->active_video_frame_rate(), _film->video_frame_rate());
 125
 126                 if (!decoder) {
 127                         /* Not something that we can decode; e.g. Atmos content */
 128                         continue;
 129                 }
 130
 131                 if (decoder->video && _ignore_video) {
 132                         decoder->video->set_ignore ();
 133                 }
 134
 135                 if (decoder->subtitle && _ignore_subtitle) {
 136                         decoder->subtitle->set_ignore ();
 137                 }
 138
 139                 shared_ptr<DCPDecoder> dcp = dynamic_pointer_cast<DCPDecoder> (decoder);
 140                 if (dcp && _play_referenced) {
 141                         if (_play_referenced) {
 142                                 dcp->set_decode_referenced ();
 143                         }
 144                         dcp->set_forced_reduction (_dcp_decode_reduction);
 145                 }
 146
 147                 shared_ptr<Piece> piece (new Piece (i, decoder, frc));
 148                 _pieces.push_back (piece);
 149
 150                 if (decoder->video) {
 151                         if (i->video->frame_type() == VIDEO_FRAME_TYPE_3D_LEFT || i->video->frame_type() == VIDEO_FRAME_TYPE_3D_RIGHT) {
 152                                 decoder->video->Data.connect (bind (&Shuffler::video, _shuffler, weak_ptr<Piece>(piece), _1));
 153                         } else {
 154                                 decoder->video->Data.connect (bind (&Player::video, this, weak_ptr<Piece>(piece), _1));
 155                         }
 156                 }
 157
 158                 if (decoder->audio) {
 159                         decoder->audio->Data.connect (bind (&Player::audio, this, weak_ptr<Piece> (piece), _1, _2));
 160                 }
 161
 162                 if (decoder->subtitle) {
 163                         decoder->subtitle->ImageStart.connect (bind (&Player::image_subtitle_start, this, weak_ptr<Piece> (piece), _1));
 164                         decoder->subtitle->TextStart.connect (bind (&Player::text_subtitle_start, this, weak_ptr<Piece> (piece), _1));
 165                         decoder->subtitle->Stop.connect (bind (&Player::subtitle_stop, this, weak_ptr<Piece> (piece), _1));
 166                 }
 167         }
 168
 169         _stream_states.clear ();
 170         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 171                 if (i->content->audio) {
 172                         BOOST_FOREACH (AudioStreamPtr j, i->content->audio->streams()) {
 173                                 _stream_states[j] = StreamState (i, i->content->position ());
 174                         }
 175                 }
 176         }
 177
 178         _black = Empty (_film->content(), _film->length(), bind(&Content::video, _1));
 179         _silent = Empty (_film->content(), _film->length(), bind(&Content::audio, _1));
 180
 181         _last_video_time = DCPTime ();
 182         _last_video_eyes = EYES_BOTH;
 183         _last_audio_time = DCPTime ();
 184         _have_valid_pieces = true;
 185 }
 186
 187 void
 188 Player::playlist_content_changed (weak_ptr<Content> w, int property, bool frequent)
 189 {
 190         shared_ptr<Content> c = w.lock ();
 191         if (!c) {
 192                 return;
 193         }
 194
 195         if (
 196                 property == ContentProperty::POSITION ||
 197                 property == ContentProperty::LENGTH ||
 198                 property == ContentProperty::TRIM_START ||
 199                 property == ContentProperty::TRIM_END ||
 200                 property == ContentProperty::PATH ||
 201                 property == VideoContentProperty::FRAME_TYPE ||
 202                 property == DCPContentProperty::NEEDS_ASSETS ||
 203                 property == DCPContentProperty::NEEDS_KDM ||
 204                 property == SubtitleContentProperty::COLOUR ||
 205                 property == SubtitleContentProperty::EFFECT ||
 206                 property == SubtitleContentProperty::EFFECT_COLOUR ||
 207                 property == FFmpegContentProperty::SUBTITLE_STREAM ||
 208                 property == FFmpegContentProperty::FILTERS ||
 209                 property == VideoContentProperty::COLOUR_CONVERSION
 210                 ) {
 211
 212                 _have_valid_pieces = false;
 213                 Changed (frequent);
 214
 215         } else if (
 216                 property == SubtitleContentProperty::LINE_SPACING ||
 217                 property == SubtitleContentProperty::OUTLINE_WIDTH ||
 218                 property == SubtitleContentProperty::Y_SCALE ||
 219                 property == SubtitleContentProperty::FADE_IN ||
 220                 property == SubtitleContentProperty::FADE_OUT ||
 221                 property == ContentProperty::VIDEO_FRAME_RATE ||
 222                 property == SubtitleContentProperty::USE ||
 223                 property == SubtitleContentProperty::X_OFFSET ||
 224                 property == SubtitleContentProperty::Y_OFFSET ||
 225                 property == SubtitleContentProperty::X_SCALE ||
 226                 property == SubtitleContentProperty::FONTS ||
 227                 property == VideoContentProperty::CROP ||
 228                 property == VideoContentProperty::SCALE ||
 229                 property == VideoContentProperty::FADE_IN ||
 230                 property == VideoContentProperty::FADE_OUT
 231                 ) {
 232
 233                 Changed (frequent);
 234         }
 235 }
 236
 237 void
 238 Player::set_video_container_size (dcp::Size s)
 239 {
 240         if (s == _video_container_size) {
 241                 return;
 242         }
 243
 244         _video_container_size = s;
 245
 246         _black_image.reset (new Image (AV_PIX_FMT_RGB24, _video_container_size, true));
 247         _black_image->make_black ();
 248
 249         Changed (false);
 250 }
 251
 252 void
 253 Player::playlist_changed ()
 254 {
 255         _have_valid_pieces = false;
 256         Changed (false);
 257 }
 258
 259 void
 260 Player::film_changed (Film::Property p)
 261 {
 262         /* Here we should notice Film properties that affect our output, and
 263            alert listeners that our output now would be different to how it was
 264            last time we were run.
 265         */
 266
 267         if (p == Film::CONTAINER) {
 268                 Changed (false);
 269         } else if (p == Film::VIDEO_FRAME_RATE) {
 270                 /* Pieces contain a FrameRateChange which contains the DCP frame rate,
 271                    so we need new pieces here.
 272                 */
 273                 _have_valid_pieces = false;
 274                 Changed (false);
 275         } else if (p == Film::AUDIO_PROCESSOR) {
 276                 if (_film->audio_processor ()) {
 277                         _audio_processor = _film->audio_processor()->clone (_film->audio_frame_rate ());
 278                 }
 279         }
 280 }
 281
 282 list<PositionImage>
 283 Player::transform_image_subtitles (list<ImageSubtitle> subs) const
 284 {
 285         list<PositionImage> all;
 286
 287         for (list<ImageSubtitle>::const_iterator i = subs.begin(); i != subs.end(); ++i) {
 288                 if (!i->image) {
 289                         continue;
 290                 }
 291
 292                 /* We will scale the subtitle up to fit _video_container_size */
 293                 dcp::Size scaled_size (i->rectangle.width * _video_container_size.width, i->rectangle.height * _video_container_size.height);
 294
 295                 /* Then we need a corrective translation, consisting of two parts:
 296                  *
 297                  * 1.  that which is the result of the scaling of the subtitle by _video_container_size; this will be
 298                  *     rect.x * _video_container_size.width and rect.y * _video_container_size.height.
 299                  *
 300                  * 2.  that to shift the origin of the scale by subtitle_scale to the centre of the subtitle; this will be
 301                  *     (width_before_subtitle_scale * (1 - subtitle_x_scale) / 2) and
 302                  *     (height_before_subtitle_scale * (1 - subtitle_y_scale) / 2).
 303                  *
 304                  * Combining these two translations gives these expressions.
 305                  */
 306
 307                 all.push_back (
 308                         PositionImage (
 309                                 i->image->scale (
 310                                         scaled_size,
 311                                         dcp::YUV_TO_RGB_REC601,
 312                                         i->image->pixel_format (),
 313                                         true,
 314                                         _fast
 315                                         ),
 316                                 Position<int> (
 317                                         lrint (_video_container_size.width * i->rectangle.x),
 318                                         lrint (_video_container_size.height * i->rectangle.y)
 319                                         )
 320                                 )
 321                         );
 322         }
 323
 324         return all;
 325 }
 326
 327 shared_ptr<PlayerVideo>
 328 Player::black_player_video_frame (Eyes eyes) const
 329 {
 330         return shared_ptr<PlayerVideo> (
 331                 new PlayerVideo (
 332                         shared_ptr<const ImageProxy> (new RawImageProxy (_black_image)),
 333                         Crop (),
 334                         optional<double> (),
 335                         _video_container_size,
 336                         _video_container_size,
 337                         eyes,
 338                         PART_WHOLE,
 339                         PresetColourConversion::all().front().conversion
 340                 )
 341         );
 342 }
 343
 344 Frame
 345 Player::dcp_to_content_video (shared_ptr<const Piece> piece, DCPTime t) const
 346 {
 347         DCPTime s = t - piece->content->position ();
 348         s = min (piece->content->length_after_trim(), s);
 349         s = max (DCPTime(), s + DCPTime (piece->content->trim_start(), piece->frc));
 350
 351         /* It might seem more logical here to convert s to a ContentTime (using the FrameRateChange)
 352            then convert that ContentTime to frames at the content's rate.  However this fails for
 353            situations like content at 29.9978733fps, DCP at 30fps.  The accuracy of the Time type is not
 354            enough to distinguish between the two with low values of time (e.g. 3200 in Time units).
 355
 356            Instead we convert the DCPTime using the DCP video rate then account for any skip/repeat.
 357         */
 358         return s.frames_floor (piece->frc.dcp) / piece->frc.factor ();
 359 }
 360
 361 DCPTime
 362 Player::content_video_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 363 {
 364         /* See comment in dcp_to_content_video */
 365         DCPTime const d = DCPTime::from_frames (f * piece->frc.factor(), piece->frc.dcp) - DCPTime(piece->content->trim_start(), piece->frc);
 366         return d + piece->content->position();
 367 }
 368
 369 Frame
 370 Player::dcp_to_resampled_audio (shared_ptr<const Piece> piece, DCPTime t) const
 371 {
 372         DCPTime s = t - piece->content->position ();
 373         s = min (piece->content->length_after_trim(), s);
 374         /* See notes in dcp_to_content_video */
 375         return max (DCPTime (), DCPTime (piece->content->trim_start (), piece->frc) + s).frames_floor (_film->audio_frame_rate ());
 376 }
 377
 378 DCPTime
 379 Player::resampled_audio_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 380 {
 381         /* See comment in dcp_to_content_video */
 382         return DCPTime::from_frames (f, _film->audio_frame_rate())
 383                 - DCPTime (piece->content->trim_start(), piece->frc)
 384                 + piece->content->position();
 385 }
 386
 387 ContentTime
 388 Player::dcp_to_content_time (shared_ptr<const Piece> piece, DCPTime t) const
 389 {
 390         DCPTime s = t - piece->content->position ();
 391         s = min (piece->content->length_after_trim(), s);
 392         return max (ContentTime (), ContentTime (s, piece->frc) + piece->content->trim_start());
 393 }
 394
 395 DCPTime
 396 Player::content_time_to_dcp (shared_ptr<const Piece> piece, ContentTime t) const
 397 {
 398         return max (DCPTime (), DCPTime (t - piece->content->trim_start(), piece->frc) + piece->content->position());
 399 }
 400
 401 list<shared_ptr<Font> >
 402 Player::get_subtitle_fonts ()
 403 {
 404         if (!_have_valid_pieces) {
 405                 setup_pieces ();
 406         }
 407
 408         list<shared_ptr<Font> > fonts;
 409         BOOST_FOREACH (shared_ptr<Piece>& p, _pieces) {
 410                 if (p->content->subtitle) {
 411                         /* XXX: things may go wrong if there are duplicate font IDs
 412                            with different font files.
 413                         */
 414                         list<shared_ptr<Font> > f = p->content->subtitle->fonts ();
 415                         copy (f.begin(), f.end(), back_inserter (fonts));
 416                 }
 417         }
 418
 419         return fonts;
 420 }
 421
 422 /** Set this player never to produce any video data */
 423 void
 424 Player::set_ignore_video ()
 425 {
 426         _ignore_video = true;
 427 }
 428
 429 void
 430 Player::set_ignore_subtitle ()
 431 {
 432         _ignore_subtitle = true;
 433 }
 434
 435 /** Set whether or not this player should always burn text subtitles into the image,
 436  *  regardless of the content settings.
 437  *  @param burn true to always burn subtitles, false to obey content settings.
 438  */
 439 void
 440 Player::set_always_burn_subtitles (bool burn)
 441 {
 442         _always_burn_subtitles = burn;
 443 }
 444
 445 /** Sets up the player to be faster, possibly at the expense of quality */
 446 void
 447 Player::set_fast ()
 448 {
 449         _fast = true;
 450         _have_valid_pieces = false;
 451 }
 452
 453 void
 454 Player::set_play_referenced ()
 455 {
 456         _play_referenced = true;
 457         _have_valid_pieces = false;
 458 }
 459
 460 list<ReferencedReelAsset>
 461 Player::get_reel_assets ()
 462 {
 463         list<ReferencedReelAsset> a;
 464
 465         BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
 466                 shared_ptr<DCPContent> j = dynamic_pointer_cast<DCPContent> (i);
 467                 if (!j) {
 468                         continue;
 469                 }
 470
 471                 scoped_ptr<DCPDecoder> decoder;
 472                 try {
 473                         decoder.reset (new DCPDecoder (j, _film->log(), false));
 474                 } catch (...) {
 475                         return a;
 476                 }
 477
 478                 int64_t offset = 0;
 479                 BOOST_FOREACH (shared_ptr<dcp::Reel> k, decoder->reels()) {
 480
 481                         DCPOMATIC_ASSERT (j->video_frame_rate ());
 482                         double const cfr = j->video_frame_rate().get();
 483                         Frame const trim_start = j->trim_start().frames_round (cfr);
 484                         Frame const trim_end = j->trim_end().frames_round (cfr);
 485                         int const ffr = _film->video_frame_rate ();
 486
 487                         DCPTime const from = i->position() + DCPTime::from_frames (offset, _film->video_frame_rate());
 488                         if (j->reference_video ()) {
 489                                 shared_ptr<dcp::ReelAsset> ra = k->main_picture ();
 490                                 DCPOMATIC_ASSERT (ra);
 491                                 ra->set_entry_point (ra->entry_point() + trim_start);
 492                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 493                                 a.push_back (
 494                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 495                                         );
 496                         }
 497
 498                         if (j->reference_audio ()) {
 499                                 shared_ptr<dcp::ReelAsset> ra = k->main_sound ();
 500                                 DCPOMATIC_ASSERT (ra);
 501                                 ra->set_entry_point (ra->entry_point() + trim_start);
 502                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 503                                 a.push_back (
 504                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 505                                         );
 506                         }
 507
 508                         if (j->reference_subtitle ()) {
 509                                 shared_ptr<dcp::ReelAsset> ra = k->main_subtitle ();
 510                                 DCPOMATIC_ASSERT (ra);
 511                                 ra->set_entry_point (ra->entry_point() + trim_start);
 512                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 513                                 a.push_back (
 514                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 515                                         );
 516                         }
 517
 518                         /* Assume that main picture duration is the length of the reel */
 519                         offset += k->main_picture()->duration ();
 520                 }
 521         }
 522
 523         return a;
 524 }
 525
 526 bool
 527 Player::pass ()
 528 {
 529         if (!_have_valid_pieces) {
 530                 setup_pieces ();
 531         }
 532
 533         if (_playlist->length() == DCPTime()) {
 534                 /* Special case of an empty Film; just give one black frame */
 535                 emit_video (black_player_video_frame(EYES_BOTH), DCPTime());
 536                 return true;
 537         }
 538
 539         /* Find the decoder or empty which is farthest behind where we are and make it emit some data */
 540
 541         shared_ptr<Piece> earliest_content;
 542         optional<DCPTime> earliest_time;
 543
 544         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 545                 if (i->done) {
 546                         continue;
 547                 }
 548
 549                 DCPTime const t = content_time_to_dcp (i, i->decoder->position());
 550                 if (t > i->content->end()) {
 551                         i->done = true;
 552                 } else {
 553
 554                         /* Given two choices at the same time, pick the one with a subtitle so we see it before
 555                            the video.
 556                         */
 557                         if (!earliest_time || t < *earliest_time || (t == *earliest_time && i->decoder->subtitle)) {
 558                                 earliest_time = t;
 559                                 earliest_content = i;
 560                         }
 561                 }
 562         }
 563
 564         bool done = false;
 565
 566         enum {
 567                 NONE,
 568                 CONTENT,
 569                 BLACK,
 570                 SILENT
 571         } which = NONE;
 572
 573         if (earliest_content) {
 574                 which = CONTENT;
 575         }
 576
 577         if (!_black.done() && (!earliest_time || _black.position() < *earliest_time)) {
 578                 earliest_time = _black.position ();
 579                 which = BLACK;
 580         }
 581
 582         if (!_silent.done() && (!earliest_time || _silent.position() < *earliest_time)) {
 583                 earliest_time = _silent.position ();
 584                 which = SILENT;
 585         }
 586
 587         switch (which) {
 588         case CONTENT:
 589                 earliest_content->done = earliest_content->decoder->pass ();
 590                 break;
 591         case BLACK:
 592                 emit_video (black_player_video_frame(EYES_BOTH), _black.position());
 593                 _black.set_position (_black.position() + one_video_frame());
 594                 break;
 595         case SILENT:
 596         {
 597                 DCPTimePeriod period (_silent.period_at_position());
 598                 if (_last_audio_time) {
 599                         /* Sometimes the thing that happened last finishes fractionally before
 600                            this silence.  Bodge the start time of the silence to fix it.  I'm
 601                            not sure if this is the right solution --- maybe the last thing should
 602                            be padded `forward' rather than this thing padding `back'.
 603                         */
 604                         period.from = min(period.from, *_last_audio_time);
 605                 }
 606                 if (period.duration() > one_video_frame()) {
 607                         period.to = period.from + one_video_frame();
 608                 }
 609                 fill_audio (period);
 610                 _silent.set_position (period.to);
 611                 break;
 612         }
 613         case NONE:
 614                 done = true;
 615                 break;
 616         }
 617
 618         /* Emit any audio that is ready */
 619
 620         /* Work out the time before which the audio is definitely all here.  This is the earliest last_push_end of one
 621            of our streams, or the position of the _silent.
 622         */
 623         DCPTime pull_to = _film->length ();
 624         for (map<AudioStreamPtr, StreamState>::const_iterator i = _stream_states.begin(); i != _stream_states.end(); ++i) {
 625                 if (!i->second.piece->done && i->second.last_push_end < pull_to) {
 626                         pull_to = i->second.last_push_end;
 627                 }
 628         }
 629         if (!_silent.done() && _silent.position() < pull_to) {
 630                 pull_to = _silent.position();
 631         }
 632
 633         list<pair<shared_ptr<AudioBuffers>, DCPTime> > audio = _audio_merger.pull (pull_to);
 634         for (list<pair<shared_ptr<AudioBuffers>, DCPTime> >::iterator i = audio.begin(); i != audio.end(); ++i) {
 635                 if (_last_audio_time && i->second < *_last_audio_time) {
 636                         /* This new data comes before the last we emitted (or the last seek); discard it */
 637                         pair<shared_ptr<AudioBuffers>, DCPTime> cut = discard_audio (i->first, i->second, *_last_audio_time);
 638                         if (!cut.first) {
 639                                 continue;
 640                         }
 641                         *i = cut;
 642                 } else if (_last_audio_time && i->second > *_last_audio_time) {
 643                         /* There's a gap between this data and the last we emitted; fill with silence */
 644                         fill_audio (DCPTimePeriod (*_last_audio_time, i->second));
 645                 }
 646
 647                 emit_audio (i->first, i->second);
 648         }
 649
 650         if (done) {
 651                 _shuffler->flush ();
 652         }
 653         return done;
 654 }
 655
 656 optional<PositionImage>
 657 Player::subtitles_for_frame (DCPTime time) const
 658 {
 659         list<PositionImage> subtitles;
 660
 661         int const vfr = _film->video_frame_rate();
 662
 663         BOOST_FOREACH (PlayerSubtitles i, _active_subtitles.get_burnt (DCPTimePeriod(time, time + DCPTime::from_frames(1, vfr)), _always_burn_subtitles)) {
 664
 665                 /* Image subtitles */
 666                 list<PositionImage> c = transform_image_subtitles (i.image);
 667                 copy (c.begin(), c.end(), back_inserter (subtitles));
 668
 669                 /* Text subtitles (rendered to an image) */
 670                 if (!i.text.empty ()) {
 671                         list<PositionImage> s = render_subtitles (i.text, i.fonts, _video_container_size, time, vfr);
 672                         copy (s.begin(), s.end(), back_inserter (subtitles));
 673                 }
 674         }
 675
 676         if (subtitles.empty ()) {
 677                 return optional<PositionImage> ();
 678         }
 679
 680         return merge (subtitles);
 681 }
 682
 683 void
 684 Player::video (weak_ptr<Piece> wp, ContentVideo video)
 685 {
 686         shared_ptr<Piece> piece = wp.lock ();
 687         if (!piece) {
 688                 return;
 689         }
 690
 691         FrameRateChange frc(piece->content->active_video_frame_rate(), _film->video_frame_rate());
 692         if (frc.skip && (video.frame % 2) == 1) {
 693                 return;
 694         }
 695
 696         /* Time of the first frame we will emit */
 697         DCPTime const time = content_video_to_dcp (piece, video.frame);
 698
 699         /* Discard if it's before the content's period or the last accurate seek.  We can't discard
 700            if it's after the content's period here as in that case we still need to fill any gap between
 701            `now' and the end of the content's period.
 702         */
 703         if (time < piece->content->position() || (_last_video_time && time < *_last_video_time)) {
 704                 return;
 705         }
 706
 707         /* Fill gaps that we discover now that we have some video which needs to be emitted.
 708            This is where we need to fill to.
 709         */
 710         DCPTime fill_to = min (time, piece->content->end());
 711
 712         if (_last_video_time) {
 713                 DCPTime fill_from = max (*_last_video_time, piece->content->position());
 714                 LastVideoMap::const_iterator last = _last_video.find (wp);
 715                 if (_film->three_d()) {
 716                         DCPTime j = fill_from;
 717                         Eyes eyes = _last_video_eyes.get_value_or(EYES_LEFT);
 718                         if (eyes == EYES_BOTH) {
 719                                 eyes = EYES_LEFT;
 720                         }
 721                         while (j < fill_to || eyes != video.eyes) {
 722                                 if (last != _last_video.end()) {
 723                                         shared_ptr<PlayerVideo> copy = last->second->shallow_copy();
 724                                         copy->set_eyes (eyes);
 725                                         emit_video (copy, j);
 726                                 } else {
 727                                         emit_video (black_player_video_frame(eyes), j);
 728                                 }
 729                                 if (eyes == EYES_RIGHT) {
 730                                         j += one_video_frame();
 731                                 }
 732                                 eyes = increment_eyes (eyes);
 733                         }
 734                 } else {
 735                         for (DCPTime j = fill_from; j < fill_to; j += one_video_frame()) {
 736                                 if (last != _last_video.end()) {
 737                                         emit_video (last->second, j);
 738                                 } else {
 739                                         emit_video (black_player_video_frame(EYES_BOTH), j);
 740                                 }
 741                         }
 742                 }
 743         }
 744
 745         _last_video[wp].reset (
 746                 new PlayerVideo (
 747                         video.image,
 748                         piece->content->video->crop (),
 749                         piece->content->video->fade (video.frame),
 750                         piece->content->video->scale().size (
 751                                 piece->content->video, _video_container_size, _film->frame_size ()
 752                                 ),
 753                         _video_container_size,
 754                         video.eyes,
 755                         video.part,
 756                         piece->content->video->colour_conversion ()
 757                         )
 758                 );
 759
 760         DCPTime t = time;
 761         for (int i = 0; i < frc.repeat; ++i) {
 762                 if (t < piece->content->end()) {
 763                         emit_video (_last_video[wp], t);
 764                 }
 765                 t += one_video_frame ();
 766         }
 767 }
 768
 769 void
 770 Player::audio (weak_ptr<Piece> wp, AudioStreamPtr stream, ContentAudio content_audio)
 771 {
 772         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
 773
 774         shared_ptr<Piece> piece = wp.lock ();
 775         if (!piece) {
 776                 return;
 777         }
 778
 779         shared_ptr<AudioContent> content = piece->content->audio;
 780         DCPOMATIC_ASSERT (content);
 781
 782         /* Compute time in the DCP */
 783         DCPTime time = resampled_audio_to_dcp (piece, content_audio.frame);
 784         /* And the end of this block in the DCP */
 785         DCPTime end = time + DCPTime::from_frames(content_audio.audio->frames(), content->resampled_frame_rate());
 786
 787         /* Remove anything that comes before the start or after the end of the content */
 788         if (time < piece->content->position()) {
 789                 pair<shared_ptr<AudioBuffers>, DCPTime> cut = discard_audio (content_audio.audio, time, piece->content->position());
 790                 if (!cut.first) {
 791                         /* This audio is entirely discarded */
 792                         return;
 793                 }
 794                 content_audio.audio = cut.first;
 795                 time = cut.second;
 796         } else if (time > piece->content->end()) {
 797                 /* Discard it all */
 798                 return;
 799         } else if (end > piece->content->end()) {
 800                 Frame const remaining_frames = DCPTime(piece->content->end() - time).frames_round(_film->audio_frame_rate());
 801                 if (remaining_frames == 0) {
 802                         return;
 803                 }
 804                 shared_ptr<AudioBuffers> cut (new AudioBuffers (content_audio.audio->channels(), remaining_frames));
 805                 cut->copy_from (content_audio.audio.get(), remaining_frames, 0, 0);
 806                 content_audio.audio = cut;
 807         }
 808
 809         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
 810
 811         /* Gain */
 812
 813         if (content->gain() != 0) {
 814                 shared_ptr<AudioBuffers> gain (new AudioBuffers (content_audio.audio));
 815                 gain->apply_gain (content->gain ());
 816                 content_audio.audio = gain;
 817         }
 818
 819         /* Remap */
 820
 821         content_audio.audio = remap (content_audio.audio, _film->audio_channels(), stream->mapping());
 822
 823         /* Process */
 824
 825         if (_audio_processor) {
 826                 content_audio.audio = _audio_processor->run (content_audio.audio, _film->audio_channels ());
 827         }
 828
 829         /* Push */
 830
 831         _audio_merger.push (content_audio.audio, time);
 832         DCPOMATIC_ASSERT (_stream_states.find (stream) != _stream_states.end ());
 833         _stream_states[stream].last_push_end = time + DCPTime::from_frames (content_audio.audio->frames(), _film->audio_frame_rate());
 834 }
 835
 836 void
 837 Player::image_subtitle_start (weak_ptr<Piece> wp, ContentImageSubtitle subtitle)
 838 {
 839         shared_ptr<Piece> piece = wp.lock ();
 840         if (!piece) {
 841                 return;
 842         }
 843
 844         /* Apply content's subtitle offsets */
 845         subtitle.sub.rectangle.x += piece->content->subtitle->x_offset ();
 846         subtitle.sub.rectangle.y += piece->content->subtitle->y_offset ();
 847
 848         /* Apply content's subtitle scale */
 849         subtitle.sub.rectangle.width *= piece->content->subtitle->x_scale ();
 850         subtitle.sub.rectangle.height *= piece->content->subtitle->y_scale ();
 851
 852         /* Apply a corrective translation to keep the subtitle centred after that scale */
 853         subtitle.sub.rectangle.x -= subtitle.sub.rectangle.width * (piece->content->subtitle->x_scale() - 1);
 854         subtitle.sub.rectangle.y -= subtitle.sub.rectangle.height * (piece->content->subtitle->y_scale() - 1);
 855
 856         PlayerSubtitles ps;
 857         ps.image.push_back (subtitle.sub);
 858         DCPTime from (content_time_to_dcp (piece, subtitle.from()));
 859
 860         _active_subtitles.add_from (wp, ps, from);
 861 }
 862
 863 void
 864 Player::text_subtitle_start (weak_ptr<Piece> wp, ContentTextSubtitle subtitle)
 865 {
 866         shared_ptr<Piece> piece = wp.lock ();
 867         if (!piece) {
 868                 return;
 869         }
 870
 871         PlayerSubtitles ps;
 872         DCPTime const from (content_time_to_dcp (piece, subtitle.from()));
 873
 874         BOOST_FOREACH (dcp::SubtitleString s, subtitle.subs) {
 875                 s.set_h_position (s.h_position() + piece->content->subtitle->x_offset ());
 876                 s.set_v_position (s.v_position() + piece->content->subtitle->y_offset ());
 877                 float const xs = piece->content->subtitle->x_scale();
 878                 float const ys = piece->content->subtitle->y_scale();
 879                 float size = s.size();
 880
 881                 /* Adjust size to express the common part of the scaling;
 882                    e.g. if xs = ys = 0.5 we scale size by 2.
 883                 */
 884                 if (xs > 1e-5 && ys > 1e-5) {
 885                         size *= 1 / min (1 / xs, 1 / ys);
 886                 }
 887                 s.set_size (size);
 888
 889                 /* Then express aspect ratio changes */
 890                 if (fabs (1.0 - xs / ys) > dcp::ASPECT_ADJUST_EPSILON) {
 891                         s.set_aspect_adjust (xs / ys);
 892                 }
 893
 894                 s.set_in (dcp::Time(from.seconds(), 1000));
 895                 ps.text.push_back (SubtitleString (s, piece->content->subtitle->outline_width()));
 896                 ps.add_fonts (piece->content->subtitle->fonts ());
 897         }
 898
 899         _active_subtitles.add_from (wp, ps, from);
 900 }
 901
 902 void
 903 Player::subtitle_stop (weak_ptr<Piece> wp, ContentTime to)
 904 {
 905         if (!_active_subtitles.have (wp)) {
 906                 return;
 907         }
 908
 909         shared_ptr<Piece> piece = wp.lock ();
 910         if (!piece) {
 911                 return;
 912         }
 913
 914         DCPTime const dcp_to = content_time_to_dcp (piece, to);
 915
 916         pair<PlayerSubtitles, DCPTime> from = _active_subtitles.add_to (wp, dcp_to);
 917
 918         if (piece->content->subtitle->use() && !_always_burn_subtitles && !piece->content->subtitle->burn()) {
 919                 Subtitle (from.first, DCPTimePeriod (from.second, dcp_to));
 920         }
 921 }
 922
 923 void
 924 Player::seek (DCPTime time, bool accurate)
 925 {
 926         if (!_have_valid_pieces) {
 927                 setup_pieces ();
 928         }
 929
 930         if (_shuffler) {
 931                 _shuffler->clear ();
 932         }
 933
 934         if (_audio_processor) {
 935                 _audio_processor->flush ();
 936         }
 937
 938         _audio_merger.clear ();
 939         _active_subtitles.clear ();
 940
 941         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 942                 if (time < i->content->position()) {
 943                         /* Before; seek to 0 */
 944                         i->decoder->seek (ContentTime(), accurate);
 945                         i->done = false;
 946                 } else if (i->content->position() <= time && time < i->content->end()) {
 947                         /* During; seek to position */
 948                         i->decoder->seek (dcp_to_content_time (i, time), accurate);
 949                         i->done = false;
 950                 } else {
 951                         /* After; this piece is done */
 952                         i->done = true;
 953                 }
 954         }
 955
 956         if (accurate) {
 957                 _last_video_time = time;
 958                 _last_video_eyes = EYES_LEFT;
 959                 _last_audio_time = time;
 960         } else {
 961                 _last_video_time = optional<DCPTime>();
 962                 _last_video_eyes = optional<Eyes>();
 963                 _last_audio_time = optional<DCPTime>();
 964         }
 965
 966         _black.set_position (time);
 967         _silent.set_position (time);
 968
 969         _last_video.clear ();
 970 }
 971
 972 void
 973 Player::emit_video (shared_ptr<PlayerVideo> pv, DCPTime time)
 974 {
 975         optional<PositionImage> subtitles = subtitles_for_frame (time);
 976         if (subtitles) {
 977                 pv->set_subtitle (subtitles.get ());
 978         }
 979
 980         Video (pv, time);
 981
 982         if (pv->eyes() == EYES_BOTH || pv->eyes() == EYES_RIGHT) {
 983                 _last_video_time = time + one_video_frame();
 984                 _active_subtitles.clear_before (time);
 985         }
 986         _last_video_eyes = increment_eyes (pv->eyes());
 987 }
 988
 989 void
 990 Player::emit_audio (shared_ptr<AudioBuffers> data, DCPTime time)
 991 {
 992         /* This audio must follow on from the previous */
 993         DCPOMATIC_ASSERT (!_last_audio_time || time == *_last_audio_time);
 994         Audio (data, time);
 995         _last_audio_time = time + DCPTime::from_frames (data->frames(), _film->audio_frame_rate());
 996 }
 997
 998 void
 999 Player::fill_audio (DCPTimePeriod period)
1000 {
1001         if (period.from == period.to) {
1002                 return;
1003         }
1004
1005         DCPOMATIC_ASSERT (period.from < period.to);
1006
1007         DCPTime t = period.from;
1008         while (t < period.to) {
1009                 DCPTime block = min (DCPTime::from_seconds (0.5), period.to - t);
1010                 Frame const samples = block.frames_round(_film->audio_frame_rate());
1011                 if (samples) {
1012                         shared_ptr<AudioBuffers> silence (new AudioBuffers (_film->audio_channels(), samples));
1013                         silence->make_silent ();
1014                         emit_audio (silence, t);
1015                 }
1016                 t += block;
1017         }
1018 }
1019
1020 DCPTime
1021 Player::one_video_frame () const
1022 {
1023         return DCPTime::from_frames (1, _film->video_frame_rate ());
1024 }
1025
1026 pair<shared_ptr<AudioBuffers>, DCPTime>
1027 Player::discard_audio (shared_ptr<const AudioBuffers> audio, DCPTime time, DCPTime discard_to) const
1028 {
1029         DCPTime const discard_time = discard_to - time;
1030         Frame const discard_frames = discard_time.frames_round(_film->audio_frame_rate());
1031         Frame remaining_frames = audio->frames() - discard_frames;
1032         if (remaining_frames <= 0) {
1033                 return make_pair(shared_ptr<AudioBuffers>(), DCPTime());
1034         }
1035         shared_ptr<AudioBuffers> cut (new AudioBuffers (audio->channels(), remaining_frames));
1036         cut->copy_from (audio.get(), remaining_frames, discard_frames, 0);
1037         return make_pair(cut, time + discard_time);
1038 }
1039
1040 void
1041 Player::set_dcp_decode_reduction (optional<int> reduction)
1042 {
1043         if (reduction == _dcp_decode_reduction) {
1044                 return;
1045         }
1046
1047         _dcp_decode_reduction = reduction;
1048         _have_valid_pieces = false;
1049         Changed (false);
1050 }