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 "resampler.h"
  51 #include "compose.hpp"
  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_audio (false)
  87         , _always_burn_subtitles (false)
  88         , _fast (false)
  89         , _play_referenced (false)
  90         , _audio_merger (_film->audio_frame_rate())
  91 {
  92         _film_changed_connection = _film->Changed.connect (bind (&Player::film_changed, this, _1));
  93         _playlist_changed_connection = _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  94         _playlist_content_changed_connection = _playlist->ContentChanged.connect (bind (&Player::playlist_content_changed, this, _1, _2, _3));
  95         set_video_container_size (_film->frame_size ());
  96
  97         film_changed (Film::AUDIO_PROCESSOR);
  98
  99         seek (DCPTime (), true);
 100 }
 101
 102 void
 103 Player::setup_pieces ()
 104 {
 105         _pieces.clear ();
 106
 107         BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
 108
 109                 if (!i->paths_valid ()) {
 110                         continue;
 111                 }
 112
 113                 shared_ptr<Decoder> decoder = decoder_factory (i, _film->log());
 114                 FrameRateChange frc (i->active_video_frame_rate(), _film->video_frame_rate());
 115
 116                 if (!decoder) {
 117                         /* Not something that we can decode; e.g. Atmos content */
 118                         continue;
 119                 }
 120
 121                 if (decoder->video && _ignore_video) {
 122                         decoder->video->set_ignore ();
 123                 }
 124
 125                 if (decoder->audio && _ignore_audio) {
 126                         decoder->audio->set_ignore ();
 127                 }
 128
 129                 shared_ptr<DCPDecoder> dcp = dynamic_pointer_cast<DCPDecoder> (decoder);
 130                 if (dcp && _play_referenced) {
 131                         dcp->set_decode_referenced ();
 132                 }
 133
 134                 shared_ptr<Piece> piece (new Piece (i, decoder, frc));
 135                 _pieces.push_back (piece);
 136
 137                 if (decoder->video) {
 138                         decoder->video->Data.connect (bind (&Player::video, this, weak_ptr<Piece> (piece), _1));
 139                 }
 140
 141                 if (decoder->audio) {
 142                         decoder->audio->Data.connect (bind (&Player::audio, this, weak_ptr<Piece> (piece), _1, _2));
 143                 }
 144
 145                 if (decoder->subtitle) {
 146                         decoder->subtitle->ImageData.connect (bind (&Player::image_subtitle, this, weak_ptr<Piece> (piece), _1));
 147                         decoder->subtitle->TextData.connect (bind (&Player::text_subtitle, 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         if (!_play_referenced) {
 160                 BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 161                         shared_ptr<DCPContent> dc = dynamic_pointer_cast<DCPContent> (i->content);
 162                         if (dc) {
 163                                 if (dc->reference_video()) {
 164                                         _no_video.push_back (DCPTimePeriod (dc->position(), dc->end()));
 165                                 }
 166                                 if (dc->reference_audio()) {
 167                                         _no_audio.push_back (DCPTimePeriod (dc->position(), dc->end()));
 168                                 }
 169                         }
 170                 }
 171         }
 172
 173         _have_valid_pieces = true;
 174 }
 175
 176 void
 177 Player::playlist_content_changed (weak_ptr<Content> w, int property, bool frequent)
 178 {
 179         shared_ptr<Content> c = w.lock ();
 180         if (!c) {
 181                 return;
 182         }
 183
 184         if (
 185                 property == ContentProperty::POSITION ||
 186                 property == ContentProperty::LENGTH ||
 187                 property == ContentProperty::TRIM_START ||
 188                 property == ContentProperty::TRIM_END ||
 189                 property == ContentProperty::PATH ||
 190                 property == VideoContentProperty::FRAME_TYPE ||
 191                 property == DCPContentProperty::NEEDS_ASSETS ||
 192                 property == DCPContentProperty::NEEDS_KDM ||
 193                 property == SubtitleContentProperty::COLOUR ||
 194                 property == SubtitleContentProperty::OUTLINE ||
 195                 property == SubtitleContentProperty::SHADOW ||
 196                 property == SubtitleContentProperty::EFFECT_COLOUR ||
 197                 property == FFmpegContentProperty::SUBTITLE_STREAM ||
 198                 property == VideoContentProperty::COLOUR_CONVERSION
 199                 ) {
 200
 201                 _have_valid_pieces = false;
 202                 Changed (frequent);
 203
 204         } else if (
 205                 property == SubtitleContentProperty::LINE_SPACING ||
 206                 property == SubtitleContentProperty::OUTLINE_WIDTH ||
 207                 property == SubtitleContentProperty::Y_SCALE ||
 208                 property == SubtitleContentProperty::FADE_IN ||
 209                 property == SubtitleContentProperty::FADE_OUT ||
 210                 property == ContentProperty::VIDEO_FRAME_RATE ||
 211                 property == SubtitleContentProperty::USE ||
 212                 property == SubtitleContentProperty::X_OFFSET ||
 213                 property == SubtitleContentProperty::Y_OFFSET ||
 214                 property == SubtitleContentProperty::X_SCALE ||
 215                 property == SubtitleContentProperty::FONTS ||
 216                 property == VideoContentProperty::CROP ||
 217                 property == VideoContentProperty::SCALE ||
 218                 property == VideoContentProperty::FADE_IN ||
 219                 property == VideoContentProperty::FADE_OUT
 220                 ) {
 221
 222                 Changed (frequent);
 223         }
 224 }
 225
 226 void
 227 Player::set_video_container_size (dcp::Size s)
 228 {
 229         _video_container_size = s;
 230
 231         _black_image.reset (new Image (AV_PIX_FMT_RGB24, _video_container_size, true));
 232         _black_image->make_black ();
 233 }
 234
 235 void
 236 Player::playlist_changed ()
 237 {
 238         _have_valid_pieces = false;
 239         Changed (false);
 240 }
 241
 242 void
 243 Player::film_changed (Film::Property p)
 244 {
 245         /* Here we should notice Film properties that affect our output, and
 246            alert listeners that our output now would be different to how it was
 247            last time we were run.
 248         */
 249
 250         if (p == Film::CONTAINER) {
 251                 Changed (false);
 252         } else if (p == Film::VIDEO_FRAME_RATE) {
 253                 /* Pieces contain a FrameRateChange which contains the DCP frame rate,
 254                    so we need new pieces here.
 255                 */
 256                 _have_valid_pieces = false;
 257                 Changed (false);
 258         } else if (p == Film::AUDIO_PROCESSOR) {
 259                 if (_film->audio_processor ()) {
 260                         _audio_processor = _film->audio_processor()->clone (_film->audio_frame_rate ());
 261                 }
 262         }
 263 }
 264
 265 list<PositionImage>
 266 Player::transform_image_subtitles (list<ImageSubtitle> subs) const
 267 {
 268         list<PositionImage> all;
 269
 270         for (list<ImageSubtitle>::const_iterator i = subs.begin(); i != subs.end(); ++i) {
 271                 if (!i->image) {
 272                         continue;
 273                 }
 274
 275                 /* We will scale the subtitle up to fit _video_container_size */
 276                 dcp::Size scaled_size (i->rectangle.width * _video_container_size.width, i->rectangle.height * _video_container_size.height);
 277
 278                 /* Then we need a corrective translation, consisting of two parts:
 279                  *
 280                  * 1.  that which is the result of the scaling of the subtitle by _video_container_size; this will be
 281                  *     rect.x * _video_container_size.width and rect.y * _video_container_size.height.
 282                  *
 283                  * 2.  that to shift the origin of the scale by subtitle_scale to the centre of the subtitle; this will be
 284                  *     (width_before_subtitle_scale * (1 - subtitle_x_scale) / 2) and
 285                  *     (height_before_subtitle_scale * (1 - subtitle_y_scale) / 2).
 286                  *
 287                  * Combining these two translations gives these expressions.
 288                  */
 289
 290                 all.push_back (
 291                         PositionImage (
 292                                 i->image->scale (
 293                                         scaled_size,
 294                                         dcp::YUV_TO_RGB_REC601,
 295                                         i->image->pixel_format (),
 296                                         true,
 297                                         _fast
 298                                         ),
 299                                 Position<int> (
 300                                         lrint (_video_container_size.width * i->rectangle.x),
 301                                         lrint (_video_container_size.height * i->rectangle.y)
 302                                         )
 303                                 )
 304                         );
 305         }
 306
 307         return all;
 308 }
 309
 310 shared_ptr<PlayerVideo>
 311 Player::black_player_video_frame () const
 312 {
 313         return shared_ptr<PlayerVideo> (
 314                 new PlayerVideo (
 315                         shared_ptr<const ImageProxy> (new RawImageProxy (_black_image)),
 316                         Crop (),
 317                         optional<double> (),
 318                         _video_container_size,
 319                         _video_container_size,
 320                         EYES_BOTH,
 321                         PART_WHOLE,
 322                         PresetColourConversion::all().front().conversion
 323                 )
 324         );
 325 }
 326
 327 Frame
 328 Player::dcp_to_content_video (shared_ptr<const Piece> piece, DCPTime t) const
 329 {
 330         DCPTime s = t - piece->content->position ();
 331         s = min (piece->content->length_after_trim(), s);
 332         s = max (DCPTime(), s + DCPTime (piece->content->trim_start(), piece->frc));
 333
 334         /* It might seem more logical here to convert s to a ContentTime (using the FrameRateChange)
 335            then convert that ContentTime to frames at the content's rate.  However this fails for
 336            situations like content at 29.9978733fps, DCP at 30fps.  The accuracy of the Time type is not
 337            enough to distinguish between the two with low values of time (e.g. 3200 in Time units).
 338
 339            Instead we convert the DCPTime using the DCP video rate then account for any skip/repeat.
 340         */
 341         return s.frames_floor (piece->frc.dcp) / piece->frc.factor ();
 342 }
 343
 344 DCPTime
 345 Player::content_video_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 346 {
 347         /* See comment in dcp_to_content_video */
 348         DCPTime const d = DCPTime::from_frames (f * piece->frc.factor(), piece->frc.dcp) - DCPTime (piece->content->trim_start (), piece->frc);
 349         return max (DCPTime (), d + piece->content->position ());
 350 }
 351
 352 Frame
 353 Player::dcp_to_resampled_audio (shared_ptr<const Piece> piece, DCPTime t) const
 354 {
 355         DCPTime s = t - piece->content->position ();
 356         s = min (piece->content->length_after_trim(), s);
 357         /* See notes in dcp_to_content_video */
 358         return max (DCPTime (), DCPTime (piece->content->trim_start (), piece->frc) + s).frames_floor (_film->audio_frame_rate ());
 359 }
 360
 361 DCPTime
 362 Player::resampled_audio_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, _film->audio_frame_rate()) - DCPTime (piece->content->trim_start (), piece->frc);
 366         return max (DCPTime (), d + piece->content->position ());
 367 }
 368
 369 ContentTime
 370 Player::dcp_to_content_time (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         return max (ContentTime (), ContentTime (s, piece->frc) + piece->content->trim_start());
 375 }
 376
 377 DCPTime
 378 Player::content_time_to_dcp (shared_ptr<const Piece> piece, ContentTime t) const
 379 {
 380         return max (DCPTime (), DCPTime (t - piece->content->trim_start(), piece->frc) + piece->content->position());
 381 }
 382
 383 list<shared_ptr<Font> >
 384 Player::get_subtitle_fonts ()
 385 {
 386         if (!_have_valid_pieces) {
 387                 setup_pieces ();
 388         }
 389
 390         list<shared_ptr<Font> > fonts;
 391         BOOST_FOREACH (shared_ptr<Piece>& p, _pieces) {
 392                 if (p->content->subtitle) {
 393                         /* XXX: things may go wrong if there are duplicate font IDs
 394                            with different font files.
 395                         */
 396                         list<shared_ptr<Font> > f = p->content->subtitle->fonts ();
 397                         copy (f.begin(), f.end(), back_inserter (fonts));
 398                 }
 399         }
 400
 401         return fonts;
 402 }
 403
 404 /** Set this player never to produce any video data */
 405 void
 406 Player::set_ignore_video ()
 407 {
 408         _ignore_video = true;
 409 }
 410
 411 /** Set this player never to produce any audio data */
 412 void
 413 Player::set_ignore_audio ()
 414 {
 415         _ignore_audio = true;
 416 }
 417
 418 /** Set whether or not this player should always burn text subtitles into the image,
 419  *  regardless of the content settings.
 420  *  @param burn true to always burn subtitles, false to obey content settings.
 421  */
 422 void
 423 Player::set_always_burn_subtitles (bool burn)
 424 {
 425         _always_burn_subtitles = burn;
 426 }
 427
 428 void
 429 Player::set_fast ()
 430 {
 431         _fast = true;
 432         _have_valid_pieces = false;
 433 }
 434
 435 void
 436 Player::set_play_referenced ()
 437 {
 438         _play_referenced = true;
 439         _have_valid_pieces = false;
 440 }
 441
 442 list<ReferencedReelAsset>
 443 Player::get_reel_assets ()
 444 {
 445         list<ReferencedReelAsset> a;
 446
 447         BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
 448                 shared_ptr<DCPContent> j = dynamic_pointer_cast<DCPContent> (i);
 449                 if (!j) {
 450                         continue;
 451                 }
 452
 453                 scoped_ptr<DCPDecoder> decoder;
 454                 try {
 455                         decoder.reset (new DCPDecoder (j, _film->log()));
 456                 } catch (...) {
 457                         return a;
 458                 }
 459
 460                 int64_t offset = 0;
 461                 BOOST_FOREACH (shared_ptr<dcp::Reel> k, decoder->reels()) {
 462
 463                         DCPOMATIC_ASSERT (j->video_frame_rate ());
 464                         double const cfr = j->video_frame_rate().get();
 465                         Frame const trim_start = j->trim_start().frames_round (cfr);
 466                         Frame const trim_end = j->trim_end().frames_round (cfr);
 467                         int const ffr = _film->video_frame_rate ();
 468
 469                         DCPTime const from = i->position() + DCPTime::from_frames (offset, _film->video_frame_rate());
 470                         if (j->reference_video ()) {
 471                                 shared_ptr<dcp::ReelAsset> ra = k->main_picture ();
 472                                 DCPOMATIC_ASSERT (ra);
 473                                 ra->set_entry_point (ra->entry_point() + trim_start);
 474                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 475                                 a.push_back (
 476                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 477                                         );
 478                         }
 479
 480                         if (j->reference_audio ()) {
 481                                 shared_ptr<dcp::ReelAsset> ra = k->main_sound ();
 482                                 DCPOMATIC_ASSERT (ra);
 483                                 ra->set_entry_point (ra->entry_point() + trim_start);
 484                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 485                                 a.push_back (
 486                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 487                                         );
 488                         }
 489
 490                         if (j->reference_subtitle ()) {
 491                                 shared_ptr<dcp::ReelAsset> ra = k->main_subtitle ();
 492                                 DCPOMATIC_ASSERT (ra);
 493                                 ra->set_entry_point (ra->entry_point() + trim_start);
 494                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 495                                 a.push_back (
 496                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 497                                         );
 498                         }
 499
 500                         /* Assume that main picture duration is the length of the reel */
 501                         offset += k->main_picture()->duration ();
 502                 }
 503         }
 504
 505         return a;
 506 }
 507
 508 list<shared_ptr<Piece> >
 509 Player::overlaps (DCPTime from, DCPTime to, boost::function<bool (Content *)> valid)
 510 {
 511         if (!_have_valid_pieces) {
 512                 setup_pieces ();
 513         }
 514
 515         list<shared_ptr<Piece> > overlaps;
 516         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 517                 if (valid (i->content.get ()) && i->content->position() < to && i->content->end() > from) {
 518                         overlaps.push_back (i);
 519                 }
 520         }
 521
 522         return overlaps;
 523 }
 524
 525 bool
 526 Player::pass ()
 527 {
 528         if (!_have_valid_pieces) {
 529                 setup_pieces ();
 530         }
 531
 532         shared_ptr<Piece> earliest;
 533         DCPTime earliest_content;
 534
 535         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 536                 if (!i->done) {
 537                         DCPTime const t = i->content->position() + DCPTime (i->decoder->position(), i->frc);
 538                         if (!earliest || t < earliest_content) {
 539                                 earliest_content = t;
 540                                 earliest = i;
 541                         }
 542                 }
 543         }
 544
 545         if (!earliest) {
 546                 /* No more content; fill up with silent black */
 547                 DCPTimePeriod remaining_video (DCPTime(), _playlist->length());
 548                 if (_last_time) {
 549                         remaining_video.from = _last_time.get() + one_video_frame();
 550                 }
 551                 fill_video (remaining_video);
 552                 fill_audio (DCPTimePeriod (_last_audio_time, _playlist->length()));
 553                 return true;
 554         }
 555
 556         earliest->done = earliest->decoder->pass ();
 557
 558         /* Emit any audio that is ready */
 559
 560         DCPTime pull_from = _playlist->length ();
 561         for (map<AudioStreamPtr, StreamState>::const_iterator i = _stream_states.begin(); i != _stream_states.end(); ++i) {
 562                 if (!i->second.piece->done && i->second.last_push_end < pull_from) {
 563                         pull_from = i->second.last_push_end;
 564                 }
 565         }
 566
 567         list<pair<shared_ptr<AudioBuffers>, DCPTime> > audio = _audio_merger.pull (pull_from);
 568         for (list<pair<shared_ptr<AudioBuffers>, DCPTime> >::iterator i = audio.begin(); i != audio.end(); ++i) {
 569                 DCPOMATIC_ASSERT (i->second >= _last_audio_time);
 570                 fill_audio (DCPTimePeriod (_last_audio_time, i->second));
 571                 Audio (i->first, i->second);
 572                 _last_audio_time = i->second + DCPTime::from_frames(i->first->frames(), _film->audio_frame_rate());
 573         }
 574
 575         return false;
 576 }
 577
 578 void
 579 Player::video (weak_ptr<Piece> wp, ContentVideo video)
 580 {
 581         shared_ptr<Piece> piece = wp.lock ();
 582         if (!piece) {
 583                 return;
 584         }
 585
 586         FrameRateChange frc(piece->content->active_video_frame_rate(), _film->video_frame_rate());
 587         if (frc.skip && (video.frame % 2) == 1) {
 588                 return;
 589         }
 590
 591         /* Time and period of the frame we will emit */
 592         DCPTime const time = content_video_to_dcp (piece, video.frame);
 593         DCPTimePeriod const period (time, time + one_video_frame());
 594
 595         /* Discard if it's outside the content's period */
 596         if (time < piece->content->position() || time >= piece->content->end()) {
 597                 return;
 598         }
 599
 600         /* Get any subtitles */
 601
 602         optional<PositionImage> subtitles;
 603
 604         for (list<pair<PlayerSubtitles, DCPTimePeriod> >::const_iterator i = _subtitles.begin(); i != _subtitles.end(); ++i) {
 605
 606                 if (!i->second.overlap (period)) {
 607                         continue;
 608                 }
 609
 610                 list<PositionImage> sub_images;
 611
 612                 /* Image subtitles */
 613                 list<PositionImage> c = transform_image_subtitles (i->first.image);
 614                 copy (c.begin(), c.end(), back_inserter (sub_images));
 615
 616                 /* Text subtitles (rendered to an image) */
 617                 if (!i->first.text.empty ()) {
 618                         list<PositionImage> s = render_subtitles (i->first.text, i->first.fonts, _video_container_size, time);
 619                         copy (s.begin (), s.end (), back_inserter (sub_images));
 620                 }
 621
 622                 if (!sub_images.empty ()) {
 623                         subtitles = merge (sub_images);
 624                 }
 625         }
 626
 627         /* Fill gaps */
 628
 629         if (_last_time) {
 630                 fill_video (DCPTimePeriod (_last_time.get() + one_video_frame(), time));
 631         }
 632
 633         _last_video.reset (
 634                 new PlayerVideo (
 635                         video.image,
 636                         piece->content->video->crop (),
 637                         piece->content->video->fade (video.frame),
 638                         piece->content->video->scale().size (
 639                                 piece->content->video, _video_container_size, _film->frame_size ()
 640                                 ),
 641                         _video_container_size,
 642                         video.eyes,
 643                         video.part,
 644                         piece->content->video->colour_conversion ()
 645                         )
 646                 );
 647
 648         if (subtitles) {
 649                 _last_video->set_subtitle (subtitles.get ());
 650         }
 651
 652         _last_time = time;
 653
 654         Video (_last_video, *_last_time);
 655
 656         /* Discard any subtitles we no longer need */
 657
 658         for (list<pair<PlayerSubtitles, DCPTimePeriod> >::iterator i = _subtitles.begin (); i != _subtitles.end(); ) {
 659                 list<pair<PlayerSubtitles, DCPTimePeriod> >::iterator tmp = i;
 660                 ++tmp;
 661
 662                 if (i->second.to < time) {
 663                         _subtitles.erase (i);
 664                 }
 665
 666                 i = tmp;
 667         }
 668 }
 669
 670 void
 671 Player::audio (weak_ptr<Piece> wp, AudioStreamPtr stream, ContentAudio content_audio)
 672 {
 673         shared_ptr<Piece> piece = wp.lock ();
 674         if (!piece) {
 675                 return;
 676         }
 677
 678         shared_ptr<AudioContent> content = piece->content->audio;
 679         DCPOMATIC_ASSERT (content);
 680
 681         /* Gain */
 682         if (content->gain() != 0) {
 683                 shared_ptr<AudioBuffers> gain (new AudioBuffers (content_audio.audio));
 684                 gain->apply_gain (content->gain ());
 685                 content_audio.audio = gain;
 686         }
 687
 688         /* Resample */
 689         if (stream->frame_rate() != content->resampled_frame_rate()) {
 690                 shared_ptr<Resampler> r = resampler (content, stream, true);
 691                 pair<shared_ptr<const AudioBuffers>, Frame> ro = r->run (content_audio.audio, content_audio.frame);
 692                 content_audio.audio = ro.first;
 693                 content_audio.frame = ro.second;
 694         }
 695
 696         /* XXX: end-trimming used to be checked here */
 697
 698         /* Compute time in the DCP */
 699         DCPTime time = resampled_audio_to_dcp (piece, content_audio.frame) + DCPTime::from_seconds (content->delay() / 1000.0);
 700
 701         /* Remove anything that comes before the start of the content */
 702         if (time < piece->content->position()) {
 703                 DCPTime const discard_time = piece->content->position() - time;
 704                 Frame discard_frames = discard_time.frames_round(_film->audio_frame_rate());
 705                 Frame remaining_frames = content_audio.audio->frames() - discard_frames;
 706                 if (remaining_frames <= 0) {
 707                         /* This audio is entirely discarded */
 708                         return;
 709                 }
 710                 shared_ptr<AudioBuffers> cut (new AudioBuffers (content_audio.audio->channels(), remaining_frames));
 711                 cut->copy_from (content_audio.audio.get(), remaining_frames, discard_frames, 0);
 712                 content_audio.audio = cut;
 713                 time += discard_time;
 714         }
 715
 716         /* Remap channels */
 717         shared_ptr<AudioBuffers> dcp_mapped (new AudioBuffers (_film->audio_channels(), content_audio.audio->frames()));
 718         dcp_mapped->make_silent ();
 719
 720         AudioMapping map = stream->mapping ();
 721         for (int i = 0; i < map.input_channels(); ++i) {
 722                 for (int j = 0; j < dcp_mapped->channels(); ++j) {
 723                         if (map.get (i, static_cast<dcp::Channel> (j)) > 0) {
 724                                 dcp_mapped->accumulate_channel (
 725                                         content_audio.audio.get(),
 726                                         i,
 727                                         static_cast<dcp::Channel> (j),
 728                                         map.get (i, static_cast<dcp::Channel> (j))
 729                                         );
 730                         }
 731                 }
 732         }
 733
 734         content_audio.audio = dcp_mapped;
 735
 736         if (_audio_processor) {
 737                 content_audio.audio = _audio_processor->run (content_audio.audio, _film->audio_channels ());
 738         }
 739
 740         _audio_merger.push (content_audio.audio, time);
 741
 742         DCPOMATIC_ASSERT (_stream_states.find (stream) != _stream_states.end ());
 743         _stream_states[stream].last_push_end = time + DCPTime::from_frames (content_audio.audio->frames(), _film->audio_frame_rate());
 744 }
 745
 746 void
 747 Player::image_subtitle (weak_ptr<Piece> wp, ContentImageSubtitle subtitle)
 748 {
 749         shared_ptr<Piece> piece = wp.lock ();
 750         if (!piece) {
 751                 return;
 752         }
 753
 754         /* Apply content's subtitle offsets */
 755         subtitle.sub.rectangle.x += piece->content->subtitle->x_offset ();
 756         subtitle.sub.rectangle.y += piece->content->subtitle->y_offset ();
 757
 758         /* Apply content's subtitle scale */
 759         subtitle.sub.rectangle.width *= piece->content->subtitle->x_scale ();
 760         subtitle.sub.rectangle.height *= piece->content->subtitle->y_scale ();
 761
 762         /* Apply a corrective translation to keep the subtitle centred after that scale */
 763         subtitle.sub.rectangle.x -= subtitle.sub.rectangle.width * (piece->content->subtitle->x_scale() - 1);
 764         subtitle.sub.rectangle.y -= subtitle.sub.rectangle.height * (piece->content->subtitle->y_scale() - 1);
 765
 766         PlayerSubtitles ps;
 767         ps.image.push_back (subtitle.sub);
 768         DCPTimePeriod period (content_time_to_dcp (piece, subtitle.period().from), content_time_to_dcp (piece, subtitle.period().to));
 769
 770         if (piece->content->subtitle->use() && (piece->content->subtitle->burn() || _always_burn_subtitles)) {
 771                 _subtitles.push_back (make_pair (ps, period));
 772         } else {
 773                 Subtitle (ps, period);
 774         }
 775 }
 776
 777 void
 778 Player::text_subtitle (weak_ptr<Piece> wp, ContentTextSubtitle subtitle)
 779 {
 780         shared_ptr<Piece> piece = wp.lock ();
 781         if (!piece) {
 782                 return;
 783         }
 784
 785         PlayerSubtitles ps;
 786         DCPTimePeriod const period (content_time_to_dcp (piece, subtitle.period().from), content_time_to_dcp (piece, subtitle.period().to));
 787
 788         BOOST_FOREACH (dcp::SubtitleString s, subtitle.subs) {
 789                 s.set_h_position (s.h_position() + piece->content->subtitle->x_offset ());
 790                 s.set_v_position (s.v_position() + piece->content->subtitle->y_offset ());
 791                 float const xs = piece->content->subtitle->x_scale();
 792                 float const ys = piece->content->subtitle->y_scale();
 793                 float size = s.size();
 794
 795                 /* Adjust size to express the common part of the scaling;
 796                    e.g. if xs = ys = 0.5 we scale size by 2.
 797                 */
 798                 if (xs > 1e-5 && ys > 1e-5) {
 799                         size *= 1 / min (1 / xs, 1 / ys);
 800                 }
 801                 s.set_size (size);
 802
 803                 /* Then express aspect ratio changes */
 804                 if (fabs (1.0 - xs / ys) > dcp::ASPECT_ADJUST_EPSILON) {
 805                         s.set_aspect_adjust (xs / ys);
 806                 }
 807
 808                 s.set_in (dcp::Time(period.from.seconds(), 1000));
 809                 s.set_out (dcp::Time(period.to.seconds(), 1000));
 810                 ps.text.push_back (SubtitleString (s, piece->content->subtitle->outline_width()));
 811                 ps.add_fonts (piece->content->subtitle->fonts ());
 812         }
 813
 814         if (piece->content->subtitle->use() && (piece->content->subtitle->burn() || _always_burn_subtitles)) {
 815                 _subtitles.push_back (make_pair (ps, period));
 816         } else {
 817                 Subtitle (ps, period);
 818         }
 819 }
 820
 821 void
 822 Player::seek (DCPTime time, bool accurate)
 823 {
 824         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 825                 if (i->content->position() <= time && time < i->content->end()) {
 826                         i->decoder->seek (dcp_to_content_time (i, time), accurate);
 827                         i->done = false;
 828                 }
 829         }
 830
 831         if (accurate) {
 832                 _last_time = time - one_video_frame ();
 833         } else {
 834                 _last_time = optional<DCPTime> ();
 835         }
 836 }
 837
 838 shared_ptr<Resampler>
 839 Player::resampler (shared_ptr<const AudioContent> content, AudioStreamPtr stream, bool create)
 840 {
 841         ResamplerMap::const_iterator i = _resamplers.find (make_pair (content, stream));
 842         if (i != _resamplers.end ()) {
 843                 return i->second;
 844         }
 845
 846         if (!create) {
 847                 return shared_ptr<Resampler> ();
 848         }
 849
 850         LOG_GENERAL (
 851                 "Creating new resampler from %1 to %2 with %3 channels",
 852                 stream->frame_rate(),
 853                 content->resampled_frame_rate(),
 854                 stream->channels()
 855                 );
 856
 857         shared_ptr<Resampler> r (
 858                 new Resampler (stream->frame_rate(), content->resampled_frame_rate(), stream->channels())
 859                 );
 860
 861         _resamplers[make_pair(content, stream)] = r;
 862         return r;
 863 }
 864
 865 void
 866 Player::fill_video (DCPTimePeriod period)
 867 {
 868         /* XXX: this may not work for 3D */
 869         BOOST_FOREACH (DCPTimePeriod i, subtract(period, _no_video)) {
 870                 for (DCPTime j = i.from; j < i.to; j += one_video_frame()) {
 871                         if (_playlist->video_content_at(j) && _last_video) {
 872                                 Video (shared_ptr<PlayerVideo> (new PlayerVideo (*_last_video)), j);
 873                         } else {
 874                                 Video (black_player_video_frame(), j);
 875                         }
 876                 }
 877         }
 878 }
 879
 880 void
 881 Player::fill_audio (DCPTimePeriod period)
 882 {
 883         BOOST_FOREACH (DCPTimePeriod i, subtract(period, _no_audio)) {
 884                 DCPTime t = i.from;
 885                 while (t < i.to) {
 886                         DCPTime block = min (DCPTime::from_seconds (0.5), i.to - t);
 887                         Frame const samples = block.frames_round(_film->audio_frame_rate());
 888                         if (samples) {
 889                                 shared_ptr<AudioBuffers> silence (new AudioBuffers (_film->audio_channels(), samples));
 890                                 silence->make_silent ();
 891                                 Audio (silence, t);
 892                         }
 893                         t += block;
 894                 }
 895         }
 896 }
 897
 898 DCPTime
 899 Player::one_video_frame () const
 900 {
 901         return DCPTime::from_frames (1, _film->video_frame_rate ());
 902 }