src/lib/player.cc

   1 /*
   2     Copyright (C) 2013-2017 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 <dcp/reel.h>
  52 #include <dcp/reel_sound_asset.h>
  53 #include <dcp/reel_subtitle_asset.h>
  54 #include <dcp/reel_picture_asset.h>
  55 #include <boost/foreach.hpp>
  56 #include <stdint.h>
  57 #include <algorithm>
  58 #include <iostream>
  59
  60 #include "i18n.h"
  61
  62 #define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), LogEntry::TYPE_GENERAL);
  63
  64 using std::list;
  65 using std::cout;
  66 using std::min;
  67 using std::max;
  68 using std::min;
  69 using std::vector;
  70 using std::pair;
  71 using std::map;
  72 using std::make_pair;
  73 using std::copy;
  74 using boost::shared_ptr;
  75 using boost::weak_ptr;
  76 using boost::dynamic_pointer_cast;
  77 using boost::optional;
  78 using boost::scoped_ptr;
  79
  80 Player::Player (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
  81         : _film (film)
  82         , _playlist (playlist)
  83         , _have_valid_pieces (false)
  84         , _ignore_video (false)
  85         , _ignore_audio (false)
  86         , _always_burn_subtitles (false)
  87         , _fast (false)
  88         , _play_referenced (false)
  89         , _audio_merger (_film->audio_frame_rate())
  90 {
  91         _film_changed_connection = _film->Changed.connect (bind (&Player::film_changed, this, _1));
  92         _playlist_changed_connection = _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  93         _playlist_content_changed_connection = _playlist->ContentChanged.connect (bind (&Player::playlist_content_changed, this, _1, _2, _3));
  94         set_video_container_size (_film->frame_size ());
  95
  96         film_changed (Film::AUDIO_PROCESSOR);
  97
  98         seek (DCPTime (), true);
  99 }
 100
 101 void
 102 Player::setup_pieces ()
 103 {
 104         _pieces.clear ();
 105
 106         BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
 107
 108                 if (!i->paths_valid ()) {
 109                         continue;
 110                 }
 111
 112                 shared_ptr<Decoder> decoder = decoder_factory (i, _film->log());
 113                 FrameRateChange frc (i->active_video_frame_rate(), _film->video_frame_rate());
 114
 115                 if (!decoder) {
 116                         /* Not something that we can decode; e.g. Atmos content */
 117                         continue;
 118                 }
 119
 120                 if (decoder->video && _ignore_video) {
 121                         decoder->video->set_ignore ();
 122                 }
 123
 124                 if (decoder->audio && _ignore_audio) {
 125                         decoder->audio->set_ignore ();
 126                 }
 127
 128                 shared_ptr<DCPDecoder> dcp = dynamic_pointer_cast<DCPDecoder> (decoder);
 129                 if (dcp && _play_referenced) {
 130                         dcp->set_decode_referenced ();
 131                 }
 132
 133                 shared_ptr<Piece> piece (new Piece (i, decoder, frc));
 134                 _pieces.push_back (piece);
 135
 136                 if (decoder->video) {
 137                         decoder->video->Data.connect (bind (&Player::video, this, weak_ptr<Piece> (piece), _1));
 138                 }
 139
 140                 if (decoder->audio) {
 141                         decoder->audio->Data.connect (bind (&Player::audio, this, weak_ptr<Piece> (piece), _1, _2));
 142                 }
 143
 144                 if (decoder->subtitle) {
 145                         decoder->subtitle->ImageStart.connect (bind (&Player::image_subtitle_start, this, weak_ptr<Piece> (piece), _1));
 146                         decoder->subtitle->TextStart.connect (bind (&Player::text_subtitle_start, this, weak_ptr<Piece> (piece), _1));
 147                         decoder->subtitle->Stop.connect (bind (&Player::subtitle_stop, this, weak_ptr<Piece> (piece), _1));
 148                 }
 149         }
 150
 151         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 152                 if (i->content->audio) {
 153                         BOOST_FOREACH (AudioStreamPtr j, i->content->audio->streams()) {
 154                                 _stream_states[j] = StreamState (i, i->content->position ());
 155                         }
 156                 }
 157         }
 158
 159         _black = Empty (_playlist, bind(&Content::video, _1));
 160         _silent = Empty (_playlist, bind(&Content::audio, _1));
 161
 162         _last_video_time = DCPTime ();
 163         _last_audio_time = DCPTime ();
 164         _have_valid_pieces = true;
 165 }
 166
 167 void
 168 Player::playlist_content_changed (weak_ptr<Content> w, int property, bool frequent)
 169 {
 170         shared_ptr<Content> c = w.lock ();
 171         if (!c) {
 172                 return;
 173         }
 174
 175         if (
 176                 property == ContentProperty::POSITION ||
 177                 property == ContentProperty::LENGTH ||
 178                 property == ContentProperty::TRIM_START ||
 179                 property == ContentProperty::TRIM_END ||
 180                 property == ContentProperty::PATH ||
 181                 property == VideoContentProperty::FRAME_TYPE ||
 182                 property == DCPContentProperty::NEEDS_ASSETS ||
 183                 property == DCPContentProperty::NEEDS_KDM ||
 184                 property == SubtitleContentProperty::COLOUR ||
 185                 property == SubtitleContentProperty::OUTLINE ||
 186                 property == SubtitleContentProperty::SHADOW ||
 187                 property == SubtitleContentProperty::EFFECT_COLOUR ||
 188                 property == FFmpegContentProperty::SUBTITLE_STREAM ||
 189                 property == VideoContentProperty::COLOUR_CONVERSION
 190                 ) {
 191
 192                 _have_valid_pieces = false;
 193                 Changed (frequent);
 194
 195         } else if (
 196                 property == SubtitleContentProperty::LINE_SPACING ||
 197                 property == SubtitleContentProperty::OUTLINE_WIDTH ||
 198                 property == SubtitleContentProperty::Y_SCALE ||
 199                 property == SubtitleContentProperty::FADE_IN ||
 200                 property == SubtitleContentProperty::FADE_OUT ||
 201                 property == ContentProperty::VIDEO_FRAME_RATE ||
 202                 property == SubtitleContentProperty::USE ||
 203                 property == SubtitleContentProperty::X_OFFSET ||
 204                 property == SubtitleContentProperty::Y_OFFSET ||
 205                 property == SubtitleContentProperty::X_SCALE ||
 206                 property == SubtitleContentProperty::FONTS ||
 207                 property == VideoContentProperty::CROP ||
 208                 property == VideoContentProperty::SCALE ||
 209                 property == VideoContentProperty::FADE_IN ||
 210                 property == VideoContentProperty::FADE_OUT
 211                 ) {
 212
 213                 Changed (frequent);
 214         }
 215 }
 216
 217 void
 218 Player::set_video_container_size (dcp::Size s)
 219 {
 220         if (s == _video_container_size) {
 221                 return;
 222         }
 223
 224         _video_container_size = s;
 225
 226         _black_image.reset (new Image (AV_PIX_FMT_RGB24, _video_container_size, true));
 227         _black_image->make_black ();
 228
 229         Changed (false);
 230 }
 231
 232 void
 233 Player::playlist_changed ()
 234 {
 235         _have_valid_pieces = false;
 236         Changed (false);
 237 }
 238
 239 void
 240 Player::film_changed (Film::Property p)
 241 {
 242         /* Here we should notice Film properties that affect our output, and
 243            alert listeners that our output now would be different to how it was
 244            last time we were run.
 245         */
 246
 247         if (p == Film::CONTAINER) {
 248                 Changed (false);
 249         } else if (p == Film::VIDEO_FRAME_RATE) {
 250                 /* Pieces contain a FrameRateChange which contains the DCP frame rate,
 251                    so we need new pieces here.
 252                 */
 253                 _have_valid_pieces = false;
 254                 Changed (false);
 255         } else if (p == Film::AUDIO_PROCESSOR) {
 256                 if (_film->audio_processor ()) {
 257                         _audio_processor = _film->audio_processor()->clone (_film->audio_frame_rate ());
 258                 }
 259         }
 260 }
 261
 262 list<PositionImage>
 263 Player::transform_image_subtitles (list<ImageSubtitle> subs) const
 264 {
 265         list<PositionImage> all;
 266
 267         for (list<ImageSubtitle>::const_iterator i = subs.begin(); i != subs.end(); ++i) {
 268                 if (!i->image) {
 269                         continue;
 270                 }
 271
 272                 /* We will scale the subtitle up to fit _video_container_size */
 273                 dcp::Size scaled_size (i->rectangle.width * _video_container_size.width, i->rectangle.height * _video_container_size.height);
 274
 275                 /* Then we need a corrective translation, consisting of two parts:
 276                  *
 277                  * 1.  that which is the result of the scaling of the subtitle by _video_container_size; this will be
 278                  *     rect.x * _video_container_size.width and rect.y * _video_container_size.height.
 279                  *
 280                  * 2.  that to shift the origin of the scale by subtitle_scale to the centre of the subtitle; this will be
 281                  *     (width_before_subtitle_scale * (1 - subtitle_x_scale) / 2) and
 282                  *     (height_before_subtitle_scale * (1 - subtitle_y_scale) / 2).
 283                  *
 284                  * Combining these two translations gives these expressions.
 285                  */
 286
 287                 all.push_back (
 288                         PositionImage (
 289                                 i->image->scale (
 290                                         scaled_size,
 291                                         dcp::YUV_TO_RGB_REC601,
 292                                         i->image->pixel_format (),
 293                                         true,
 294                                         _fast
 295                                         ),
 296                                 Position<int> (
 297                                         lrint (_video_container_size.width * i->rectangle.x),
 298                                         lrint (_video_container_size.height * i->rectangle.y)
 299                                         )
 300                                 )
 301                         );
 302         }
 303
 304         return all;
 305 }
 306
 307 shared_ptr<PlayerVideo>
 308 Player::black_player_video_frame () const
 309 {
 310         return shared_ptr<PlayerVideo> (
 311                 new PlayerVideo (
 312                         shared_ptr<const ImageProxy> (new RawImageProxy (_black_image)),
 313                         Crop (),
 314                         optional<double> (),
 315                         _video_container_size,
 316                         _video_container_size,
 317                         EYES_BOTH,
 318                         PART_WHOLE,
 319                         PresetColourConversion::all().front().conversion
 320                 )
 321         );
 322 }
 323
 324 Frame
 325 Player::dcp_to_content_video (shared_ptr<const Piece> piece, DCPTime t) const
 326 {
 327         DCPTime s = t - piece->content->position ();
 328         s = min (piece->content->length_after_trim(), s);
 329         s = max (DCPTime(), s + DCPTime (piece->content->trim_start(), piece->frc));
 330
 331         /* It might seem more logical here to convert s to a ContentTime (using the FrameRateChange)
 332            then convert that ContentTime to frames at the content's rate.  However this fails for
 333            situations like content at 29.9978733fps, DCP at 30fps.  The accuracy of the Time type is not
 334            enough to distinguish between the two with low values of time (e.g. 3200 in Time units).
 335
 336            Instead we convert the DCPTime using the DCP video rate then account for any skip/repeat.
 337         */
 338         return s.frames_floor (piece->frc.dcp) / piece->frc.factor ();
 339 }
 340
 341 DCPTime
 342 Player::content_video_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 343 {
 344         /* See comment in dcp_to_content_video */
 345         DCPTime const d = DCPTime::from_frames (f * piece->frc.factor(), piece->frc.dcp) - DCPTime (piece->content->trim_start (), piece->frc);
 346         return max (DCPTime (), d + piece->content->position ());
 347 }
 348
 349 Frame
 350 Player::dcp_to_resampled_audio (shared_ptr<const Piece> piece, DCPTime t) const
 351 {
 352         DCPTime s = t - piece->content->position ();
 353         s = min (piece->content->length_after_trim(), s);
 354         /* See notes in dcp_to_content_video */
 355         return max (DCPTime (), DCPTime (piece->content->trim_start (), piece->frc) + s).frames_floor (_film->audio_frame_rate ());
 356 }
 357
 358 DCPTime
 359 Player::resampled_audio_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 360 {
 361         /* See comment in dcp_to_content_video */
 362         return DCPTime::from_frames (f, _film->audio_frame_rate())
 363                 - DCPTime (piece->content->trim_start(), piece->frc)
 364                 + piece->content->position();
 365 }
 366
 367 ContentTime
 368 Player::dcp_to_content_time (shared_ptr<const Piece> piece, DCPTime t) const
 369 {
 370         DCPTime s = t - piece->content->position ();
 371         s = min (piece->content->length_after_trim(), s);
 372         return max (ContentTime (), ContentTime (s, piece->frc) + piece->content->trim_start());
 373 }
 374
 375 DCPTime
 376 Player::content_time_to_dcp (shared_ptr<const Piece> piece, ContentTime t) const
 377 {
 378         return max (DCPTime (), DCPTime (t - piece->content->trim_start(), piece->frc) + piece->content->position());
 379 }
 380
 381 list<shared_ptr<Font> >
 382 Player::get_subtitle_fonts ()
 383 {
 384         if (!_have_valid_pieces) {
 385                 setup_pieces ();
 386         }
 387
 388         list<shared_ptr<Font> > fonts;
 389         BOOST_FOREACH (shared_ptr<Piece>& p, _pieces) {
 390                 if (p->content->subtitle) {
 391                         /* XXX: things may go wrong if there are duplicate font IDs
 392                            with different font files.
 393                         */
 394                         list<shared_ptr<Font> > f = p->content->subtitle->fonts ();
 395                         copy (f.begin(), f.end(), back_inserter (fonts));
 396                 }
 397         }
 398
 399         return fonts;
 400 }
 401
 402 /** Set this player never to produce any video data */
 403 void
 404 Player::set_ignore_video ()
 405 {
 406         _ignore_video = true;
 407 }
 408
 409 /** Set whether or not this player should always burn text subtitles into the image,
 410  *  regardless of the content settings.
 411  *  @param burn true to always burn subtitles, false to obey content settings.
 412  */
 413 void
 414 Player::set_always_burn_subtitles (bool burn)
 415 {
 416         _always_burn_subtitles = burn;
 417 }
 418
 419 void
 420 Player::set_fast ()
 421 {
 422         _fast = true;
 423         _have_valid_pieces = false;
 424 }
 425
 426 void
 427 Player::set_play_referenced ()
 428 {
 429         _play_referenced = true;
 430         _have_valid_pieces = false;
 431 }
 432
 433 list<ReferencedReelAsset>
 434 Player::get_reel_assets ()
 435 {
 436         list<ReferencedReelAsset> a;
 437
 438         BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
 439                 shared_ptr<DCPContent> j = dynamic_pointer_cast<DCPContent> (i);
 440                 if (!j) {
 441                         continue;
 442                 }
 443
 444                 scoped_ptr<DCPDecoder> decoder;
 445                 try {
 446                         decoder.reset (new DCPDecoder (j, _film->log()));
 447                 } catch (...) {
 448                         return a;
 449                 }
 450
 451                 int64_t offset = 0;
 452                 BOOST_FOREACH (shared_ptr<dcp::Reel> k, decoder->reels()) {
 453
 454                         DCPOMATIC_ASSERT (j->video_frame_rate ());
 455                         double const cfr = j->video_frame_rate().get();
 456                         Frame const trim_start = j->trim_start().frames_round (cfr);
 457                         Frame const trim_end = j->trim_end().frames_round (cfr);
 458                         int const ffr = _film->video_frame_rate ();
 459
 460                         DCPTime const from = i->position() + DCPTime::from_frames (offset, _film->video_frame_rate());
 461                         if (j->reference_video ()) {
 462                                 shared_ptr<dcp::ReelAsset> ra = k->main_picture ();
 463                                 DCPOMATIC_ASSERT (ra);
 464                                 ra->set_entry_point (ra->entry_point() + trim_start);
 465                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 466                                 a.push_back (
 467                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 468                                         );
 469                         }
 470
 471                         if (j->reference_audio ()) {
 472                                 shared_ptr<dcp::ReelAsset> ra = k->main_sound ();
 473                                 DCPOMATIC_ASSERT (ra);
 474                                 ra->set_entry_point (ra->entry_point() + trim_start);
 475                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 476                                 a.push_back (
 477                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 478                                         );
 479                         }
 480
 481                         if (j->reference_subtitle ()) {
 482                                 shared_ptr<dcp::ReelAsset> ra = k->main_subtitle ();
 483                                 DCPOMATIC_ASSERT (ra);
 484                                 ra->set_entry_point (ra->entry_point() + trim_start);
 485                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 486                                 a.push_back (
 487                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 488                                         );
 489                         }
 490
 491                         /* Assume that main picture duration is the length of the reel */
 492                         offset += k->main_picture()->duration ();
 493                 }
 494         }
 495
 496         return a;
 497 }
 498
 499 bool
 500 Player::pass ()
 501 {
 502         if (!_have_valid_pieces) {
 503                 setup_pieces ();
 504         }
 505
 506         /* Find the decoder or empty which is farthest behind where we are and make it emit some data */
 507
 508         shared_ptr<Piece> earliest;
 509         DCPTime earliest_content;
 510
 511         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 512                 if (!i->done) {
 513                         DCPTime const t = content_time_to_dcp (i, i->decoder->position());
 514                         if (!earliest || t < earliest_content) {
 515                                 earliest_content = t;
 516                                 earliest = i;
 517                         }
 518                 }
 519         }
 520
 521         bool done = false;
 522
 523         if (!_black.done() && (!earliest ||_black.position() < earliest_content)) {
 524                 /* There is some black that must be emitted */
 525                 emit_video (black_player_video_frame(), _black.position());
 526                 _black.set_position (_black.position() + one_video_frame());
 527         } else if (!_silent.done() && (!earliest || _silent.position() < earliest_content)) {
 528                 /* There is some silence that must be emitted */
 529                 DCPTimePeriod period (_silent.period_at_position());
 530                 if (period.duration() > one_video_frame()) {
 531                         period.to = period.from + one_video_frame();
 532                 }
 533                 fill_audio (period);
 534                 _silent.set_position (period.to);
 535         } else if (_playlist->length() == DCPTime()) {
 536                 /* Special case of an empty Film; just give one black frame */
 537                 emit_video (black_player_video_frame(), DCPTime());
 538         } else if (earliest) {
 539                 earliest->done = earliest->decoder->pass ();
 540         } else {
 541                 done = true;
 542         }
 543
 544         /* Emit any audio that is ready */
 545
 546         DCPTime pull_to = _playlist->length ();
 547         for (map<AudioStreamPtr, StreamState>::const_iterator i = _stream_states.begin(); i != _stream_states.end(); ++i) {
 548                 if (!i->second.piece->done && i->second.last_push_end < pull_to) {
 549                         pull_to = i->second.last_push_end;
 550                 }
 551         }
 552
 553         list<pair<shared_ptr<AudioBuffers>, DCPTime> > audio = _audio_merger.pull (pull_to);
 554         for (list<pair<shared_ptr<AudioBuffers>, DCPTime> >::iterator i = audio.begin(); i != audio.end(); ++i) {
 555                 if (_last_audio_time && i->second < *_last_audio_time) {
 556                         /* There has been an accurate seek and we have received some audio before the seek time;
 557                            discard it.
 558                         */
 559                         pair<shared_ptr<AudioBuffers>, DCPTime> cut = discard_audio (i->first, i->second, *_last_audio_time);
 560                         if (!cut.first) {
 561                                 continue;
 562                         }
 563                         *i = cut;
 564                 }
 565
 566                 emit_audio (i->first, i->second);
 567         }
 568
 569         return done;
 570 }
 571
 572 optional<PositionImage>
 573 Player::subtitles_for_frame (DCPTime time) const
 574 {
 575         list<PositionImage> subtitles;
 576
 577         BOOST_FOREACH (PlayerSubtitles i, _active_subtitles.get_burnt (time, _always_burn_subtitles)) {
 578
 579                 /* Image subtitles */
 580                 list<PositionImage> c = transform_image_subtitles (i.image);
 581                 copy (c.begin(), c.end(), back_inserter (subtitles));
 582
 583                 /* Text subtitles (rendered to an image) */
 584                 if (!i.text.empty ()) {
 585                         list<PositionImage> s = render_subtitles (i.text, i.fonts, _video_container_size, time);
 586                         copy (s.begin(), s.end(), back_inserter (subtitles));
 587                 }
 588         }
 589
 590         if (subtitles.empty ()) {
 591                 return optional<PositionImage> ();
 592         }
 593
 594         return merge (subtitles);
 595 }
 596
 597 void
 598 Player::video (weak_ptr<Piece> wp, ContentVideo video)
 599 {
 600         shared_ptr<Piece> piece = wp.lock ();
 601         if (!piece) {
 602                 return;
 603         }
 604
 605         FrameRateChange frc(piece->content->active_video_frame_rate(), _film->video_frame_rate());
 606         if (frc.skip && (video.frame % 2) == 1) {
 607                 return;
 608         }
 609
 610         /* Time and period of the frame we will emit */
 611         DCPTime const time = content_video_to_dcp (piece, video.frame);
 612         DCPTimePeriod const period (time, time + one_video_frame());
 613
 614         /* Fill gaps that we discover now that we have some video which needs to be emitted */
 615
 616         if (_last_video_time) {
 617                 /* XXX: this may not work for 3D */
 618                 DCPTime fill_from = max (*_last_video_time, piece->content->position());
 619                 for (DCPTime j = fill_from; j < time; j += one_video_frame()) {
 620                         LastVideoMap::const_iterator k = _last_video.find (wp);
 621                         if (k != _last_video.end ()) {
 622                                 emit_video (k->second, j);
 623                         } else {
 624                                 emit_video (black_player_video_frame(), j);
 625                         }
 626                 }
 627         }
 628
 629         /* Discard if it's outside the content's period or if it's before the last accurate seek */
 630         if (
 631                 time < piece->content->position() ||
 632                 time >= piece->content->end() ||
 633                 (_last_video_time && time < *_last_video_time)) {
 634                 return;
 635         }
 636
 637         _last_video[wp].reset (
 638                 new PlayerVideo (
 639                         video.image,
 640                         piece->content->video->crop (),
 641                         piece->content->video->fade (video.frame),
 642                         piece->content->video->scale().size (
 643                                 piece->content->video, _video_container_size, _film->frame_size ()
 644                                 ),
 645                         _video_container_size,
 646                         video.eyes,
 647                         video.part,
 648                         piece->content->video->colour_conversion ()
 649                         )
 650                 );
 651
 652         emit_video (_last_video[wp], time);
 653 }
 654
 655 void
 656 Player::audio (weak_ptr<Piece> wp, AudioStreamPtr stream, ContentAudio content_audio)
 657 {
 658         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
 659
 660         shared_ptr<Piece> piece = wp.lock ();
 661         if (!piece) {
 662                 return;
 663         }
 664
 665         shared_ptr<AudioContent> content = piece->content->audio;
 666         DCPOMATIC_ASSERT (content);
 667
 668         /* Compute time in the DCP */
 669         DCPTime time = resampled_audio_to_dcp (piece, content_audio.frame);
 670         /* And the end of this block in the DCP */
 671         DCPTime end = time + DCPTime::from_frames(content_audio.audio->frames(), content->resampled_frame_rate());
 672
 673         /* Remove anything that comes before the start or after the end of the content */
 674         if (time < piece->content->position()) {
 675                 pair<shared_ptr<AudioBuffers>, DCPTime> cut = discard_audio (content_audio.audio, time, piece->content->position());
 676                 if (!cut.first) {
 677                         /* This audio is entirely discarded */
 678                         return;
 679                 }
 680                 content_audio.audio = cut.first;
 681                 time = cut.second;
 682         } else if (time > piece->content->end()) {
 683                 /* Discard it all */
 684                 return;
 685         } else if (end > piece->content->end()) {
 686                 Frame const remaining_frames = DCPTime(piece->content->end() - time).frames_round(_film->audio_frame_rate());
 687                 if (remaining_frames == 0) {
 688                         return;
 689                 }
 690                 shared_ptr<AudioBuffers> cut (new AudioBuffers (content_audio.audio->channels(), remaining_frames));
 691                 cut->copy_from (content_audio.audio.get(), remaining_frames, 0, 0);
 692                 content_audio.audio = cut;
 693         }
 694
 695         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
 696
 697         /* Gain */
 698
 699         if (content->gain() != 0) {
 700                 shared_ptr<AudioBuffers> gain (new AudioBuffers (content_audio.audio));
 701                 gain->apply_gain (content->gain ());
 702                 content_audio.audio = gain;
 703         }
 704
 705         /* Remap */
 706
 707         content_audio.audio = remap (content_audio.audio, _film->audio_channels(), stream->mapping());
 708
 709         /* Process */
 710
 711         if (_audio_processor) {
 712                 content_audio.audio = _audio_processor->run (content_audio.audio, _film->audio_channels ());
 713         }
 714
 715         /* Push */
 716
 717         _audio_merger.push (content_audio.audio, time);
 718         DCPOMATIC_ASSERT (_stream_states.find (stream) != _stream_states.end ());
 719         _stream_states[stream].last_push_end = time + DCPTime::from_frames (content_audio.audio->frames(), _film->audio_frame_rate());
 720 }
 721
 722 void
 723 Player::image_subtitle_start (weak_ptr<Piece> wp, ContentImageSubtitle subtitle)
 724 {
 725         shared_ptr<Piece> piece = wp.lock ();
 726         if (!piece) {
 727                 return;
 728         }
 729
 730         /* Apply content's subtitle offsets */
 731         subtitle.sub.rectangle.x += piece->content->subtitle->x_offset ();
 732         subtitle.sub.rectangle.y += piece->content->subtitle->y_offset ();
 733
 734         /* Apply content's subtitle scale */
 735         subtitle.sub.rectangle.width *= piece->content->subtitle->x_scale ();
 736         subtitle.sub.rectangle.height *= piece->content->subtitle->y_scale ();
 737
 738         /* Apply a corrective translation to keep the subtitle centred after that scale */
 739         subtitle.sub.rectangle.x -= subtitle.sub.rectangle.width * (piece->content->subtitle->x_scale() - 1);
 740         subtitle.sub.rectangle.y -= subtitle.sub.rectangle.height * (piece->content->subtitle->y_scale() - 1);
 741
 742         PlayerSubtitles ps;
 743         ps.image.push_back (subtitle.sub);
 744         DCPTime from (content_time_to_dcp (piece, subtitle.from()));
 745
 746         _active_subtitles.add_from (wp, ps, from);
 747 }
 748
 749 void
 750 Player::text_subtitle_start (weak_ptr<Piece> wp, ContentTextSubtitle subtitle)
 751 {
 752         shared_ptr<Piece> piece = wp.lock ();
 753         if (!piece) {
 754                 return;
 755         }
 756
 757         PlayerSubtitles ps;
 758         DCPTime const from (content_time_to_dcp (piece, subtitle.from()));
 759
 760         BOOST_FOREACH (dcp::SubtitleString s, subtitle.subs) {
 761                 s.set_h_position (s.h_position() + piece->content->subtitle->x_offset ());
 762                 s.set_v_position (s.v_position() + piece->content->subtitle->y_offset ());
 763                 float const xs = piece->content->subtitle->x_scale();
 764                 float const ys = piece->content->subtitle->y_scale();
 765                 float size = s.size();
 766
 767                 /* Adjust size to express the common part of the scaling;
 768                    e.g. if xs = ys = 0.5 we scale size by 2.
 769                 */
 770                 if (xs > 1e-5 && ys > 1e-5) {
 771                         size *= 1 / min (1 / xs, 1 / ys);
 772                 }
 773                 s.set_size (size);
 774
 775                 /* Then express aspect ratio changes */
 776                 if (fabs (1.0 - xs / ys) > dcp::ASPECT_ADJUST_EPSILON) {
 777                         s.set_aspect_adjust (xs / ys);
 778                 }
 779
 780                 s.set_in (dcp::Time(from.seconds(), 1000));
 781                 ps.text.push_back (SubtitleString (s, piece->content->subtitle->outline_width()));
 782                 ps.add_fonts (piece->content->subtitle->fonts ());
 783         }
 784
 785         _active_subtitles.add_from (wp, ps, from);
 786 }
 787
 788 void
 789 Player::subtitle_stop (weak_ptr<Piece> wp, ContentTime to)
 790 {
 791         if (!_active_subtitles.have (wp)) {
 792                 return;
 793         }
 794
 795         shared_ptr<Piece> piece = wp.lock ();
 796         if (!piece) {
 797                 return;
 798         }
 799
 800         DCPTime const dcp_to = content_time_to_dcp (piece, to);
 801
 802         pair<PlayerSubtitles, DCPTime> from = _active_subtitles.add_to (wp, dcp_to);
 803
 804         if (piece->content->subtitle->use() && !_always_burn_subtitles && !piece->content->subtitle->burn()) {
 805                 Subtitle (from.first, DCPTimePeriod (from.second, dcp_to));
 806         }
 807 }
 808
 809 void
 810 Player::seek (DCPTime time, bool accurate)
 811 {
 812         if (_audio_processor) {
 813                 _audio_processor->flush ();
 814         }
 815
 816         _audio_merger.clear ();
 817         _active_subtitles.clear ();
 818
 819         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 820                 if (time < i->content->position()) {
 821                         /* Before; seek to 0 */
 822                         i->decoder->seek (ContentTime(), accurate);
 823                         i->done = false;
 824                 } else if (i->content->position() <= time && time < i->content->end()) {
 825                         /* During; seek to position */
 826                         i->decoder->seek (dcp_to_content_time (i, time), accurate);
 827                         i->done = false;
 828                 } else {
 829                         /* After; this piece is done */
 830                         i->done = true;
 831                 }
 832         }
 833
 834         if (accurate) {
 835                 _last_video_time = time;
 836                 _last_audio_time = time;
 837         } else {
 838                 _last_video_time = optional<DCPTime>();
 839                 _last_audio_time = optional<DCPTime>();
 840         }
 841
 842         _black.set_position (time);
 843         _silent.set_position (time);
 844
 845         _last_video.clear ();
 846 }
 847
 848 void
 849 Player::emit_video (shared_ptr<PlayerVideo> pv, DCPTime time)
 850 {
 851         optional<PositionImage> subtitles = subtitles_for_frame (time);
 852         if (subtitles) {
 853                 pv->set_subtitle (subtitles.get ());
 854         }
 855
 856         Video (pv, time);
 857
 858         if (pv->eyes() == EYES_BOTH || pv->eyes() == EYES_RIGHT) {
 859                 _last_video_time = time + one_video_frame();
 860                 _active_subtitles.clear_before (time);
 861         }
 862 }
 863
 864 void
 865 Player::emit_audio (shared_ptr<AudioBuffers> data, DCPTime time)
 866 {
 867         Audio (data, time);
 868         _last_audio_time = time + DCPTime::from_frames (data->frames(), _film->audio_frame_rate());
 869 }
 870
 871 void
 872 Player::fill_audio (DCPTimePeriod period)
 873 {
 874         if (period.from == period.to) {
 875                 return;
 876         }
 877
 878         DCPOMATIC_ASSERT (period.from < period.to);
 879
 880         DCPTime t = period.from;
 881         while (t < period.to) {
 882                 DCPTime block = min (DCPTime::from_seconds (0.5), period.to - t);
 883                 Frame const samples = block.frames_round(_film->audio_frame_rate());
 884                 if (samples) {
 885                         shared_ptr<AudioBuffers> silence (new AudioBuffers (_film->audio_channels(), samples));
 886                         silence->make_silent ();
 887                         emit_audio (silence, t);
 888                 }
 889                 t += block;
 890         }
 891 }
 892
 893 DCPTime
 894 Player::one_video_frame () const
 895 {
 896         return DCPTime::from_frames (1, _film->video_frame_rate ());
 897 }
 898
 899 pair<shared_ptr<AudioBuffers>, DCPTime>
 900 Player::discard_audio (shared_ptr<const AudioBuffers> audio, DCPTime time, DCPTime discard_to) const
 901 {
 902         DCPTime const discard_time = discard_to - time;
 903         Frame const discard_frames = discard_time.frames_round(_film->audio_frame_rate());
 904         Frame remaining_frames = audio->frames() - discard_frames;
 905         if (remaining_frames <= 0) {
 906                 return make_pair(shared_ptr<AudioBuffers>(), DCPTime());
 907         }
 908         shared_ptr<AudioBuffers> cut (new AudioBuffers (audio->channels(), remaining_frames));
 909         cut->copy_from (audio.get(), remaining_frames, discard_frames, 0);
 910         return make_pair(cut, time + discard_time);
 911 }