src/lib/player.cc

   1 /*
   2     Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <stdint.h>
  21 #include "player.h"
  22 #include "film.h"
  23 #include "ffmpeg_decoder.h"
  24 #include "ffmpeg_content.h"
  25 #include "image_decoder.h"
  26 #include "image_content.h"
  27 #include "sndfile_decoder.h"
  28 #include "sndfile_content.h"
  29 #include "subtitle_content.h"
  30 #include "playlist.h"
  31 #include "job.h"
  32 #include "image.h"
  33 #include "ratio.h"
  34 #include "resampler.h"
  35 #include "log.h"
  36 #include "scaler.h"
  37
  38 using std::list;
  39 using std::cout;
  40 using std::min;
  41 using std::max;
  42 using std::vector;
  43 using std::pair;
  44 using std::map;
  45 using boost::shared_ptr;
  46 using boost::weak_ptr;
  47 using boost::dynamic_pointer_cast;
  48
  49 class Piece
  50 {
  51 public:
  52         Piece (shared_ptr<Content> c)
  53                 : content (c)
  54                 , video_position (c->position ())
  55                 , audio_position (c->position ())
  56                 , repeat_to_do (0)
  57                 , repeat_done (0)
  58         {}
  59
  60         Piece (shared_ptr<Content> c, shared_ptr<Decoder> d)
  61                 : content (c)
  62                 , decoder (d)
  63                 , video_position (c->position ())
  64                 , audio_position (c->position ())
  65         {}
  66
  67         /** Set this piece to repeat a video frame a given number of times */
  68         void set_repeat (IncomingVideo video, int num)
  69         {
  70                 repeat_video = video;
  71                 repeat_to_do = num;
  72                 repeat_done = 0;
  73         }
  74
  75         void reset_repeat ()
  76         {
  77                 repeat_video.image.reset ();
  78                 repeat_to_do = 0;
  79                 repeat_done = 0;
  80         }
  81
  82         bool repeating () const
  83         {
  84                 return repeat_done != repeat_to_do;
  85         }
  86
  87         void repeat (Player* player)
  88         {
  89                 player->process_video (
  90                         repeat_video.weak_piece,
  91                         repeat_video.image,
  92                         repeat_video.eyes,
  93                         repeat_done > 0,
  94                         repeat_video.frame,
  95                         (repeat_done + 1) * (TIME_HZ / player->_film->video_frame_rate ())
  96                         );
  97
  98                 ++repeat_done;
  99         }
 100
 101         shared_ptr<Content> content;
 102         shared_ptr<Decoder> decoder;
 103         /** Time of the last video we emitted relative to the start of the DCP */
 104         Time video_position;
 105         /** Time of the last audio we emitted relative to the start of the DCP */
 106         Time audio_position;
 107
 108         IncomingVideo repeat_video;
 109         int repeat_to_do;
 110         int repeat_done;
 111 };
 112
 113 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
 114         : _film (f)
 115         , _playlist (p)
 116         , _video (true)
 117         , _audio (true)
 118         , _have_valid_pieces (false)
 119         , _video_position (0)
 120         , _audio_position (0)
 121         , _audio_merger (f->audio_channels(), bind (&Film::time_to_audio_frames, f.get(), _1), bind (&Film::audio_frames_to_time, f.get(), _1))
 122         , _last_emit_was_black (false)
 123 {
 124         _playlist_changed_connection = _playlist->Changed.connect (bind (&Player::playlist_changed, this));
 125         _playlist_content_changed_connection = _playlist->ContentChanged.connect (bind (&Player::content_changed, this, _1, _2, _3));
 126         _film_changed_connection = _film->Changed.connect (bind (&Player::film_changed, this, _1));
 127         set_video_container_size (fit_ratio_within (_film->container()->ratio (), _film->full_frame ()));
 128 }
 129
 130 void
 131 Player::disable_video ()
 132 {
 133         _video = false;
 134 }
 135
 136 void
 137 Player::disable_audio ()
 138 {
 139         _audio = false;
 140 }
 141
 142 bool
 143 Player::pass ()
 144 {
 145         if (!_have_valid_pieces) {
 146                 setup_pieces ();
 147         }
 148
 149         Time earliest_t = TIME_MAX;
 150         shared_ptr<Piece> earliest;
 151         enum {
 152                 VIDEO,
 153                 AUDIO
 154         } type = VIDEO;
 155
 156         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 157                 if ((*i)->decoder->done ()) {
 158                         continue;
 159                 }
 160
 161                 shared_ptr<VideoDecoder> vd = dynamic_pointer_cast<VideoDecoder> ((*i)->decoder);
 162                 shared_ptr<AudioDecoder> ad = dynamic_pointer_cast<AudioDecoder> ((*i)->decoder);
 163
 164                 if (_video && vd) {
 165                         if ((*i)->video_position < earliest_t) {
 166                                 earliest_t = (*i)->video_position;
 167                                 earliest = *i;
 168                                 type = VIDEO;
 169                         }
 170                 }
 171
 172                 if (_audio && ad && ad->has_audio ()) {
 173                         if ((*i)->audio_position < earliest_t) {
 174                                 earliest_t = (*i)->audio_position;
 175                                 earliest = *i;
 176                                 type = AUDIO;
 177                         }
 178                 }
 179         }
 180
 181         if (!earliest) {
 182                 flush ();
 183                 return true;
 184         }
 185
 186         switch (type) {
 187         case VIDEO:
 188                 if (earliest_t > _video_position) {
 189                         emit_black ();
 190                 } else {
 191                         if (earliest->repeating ()) {
 192                                 earliest->repeat (this);
 193                         } else {
 194                                 earliest->decoder->pass ();
 195                         }
 196                 }
 197                 break;
 198
 199         case AUDIO:
 200                 if (earliest_t > _audio_position) {
 201                         emit_silence (_film->time_to_audio_frames (earliest_t - _audio_position));
 202                 } else {
 203                         earliest->decoder->pass ();
 204
 205                         if (earliest->decoder->done()) {
 206                                 shared_ptr<AudioContent> ac = dynamic_pointer_cast<AudioContent> (earliest->content);
 207                                 assert (ac);
 208                                 shared_ptr<Resampler> re = resampler (ac, false);
 209                                 if (re) {
 210                                         shared_ptr<const AudioBuffers> b = re->flush ();
 211                                         if (b->frames ()) {
 212                                                 process_audio (earliest, b, ac->audio_length ());
 213                                         }
 214                                 }
 215                         }
 216                 }
 217                 break;
 218         }
 219
 220         if (_audio) {
 221                 boost::optional<Time> audio_done_up_to;
 222                 for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 223                         if ((*i)->decoder->done ()) {
 224                                 continue;
 225                         }
 226
 227                         if (dynamic_pointer_cast<AudioDecoder> ((*i)->decoder)) {
 228                                 audio_done_up_to = min (audio_done_up_to.get_value_or (TIME_MAX), (*i)->audio_position);
 229                         }
 230                 }
 231
 232                 if (audio_done_up_to) {
 233                         TimedAudioBuffers<Time> tb = _audio_merger.pull (audio_done_up_to.get ());
 234                         Audio (tb.audio, tb.time);
 235                         _audio_position += _film->audio_frames_to_time (tb.audio->frames ());
 236                 }
 237         }
 238
 239         return false;
 240 }
 241
 242 /** @param extra Amount of extra time to add to the content frame's time (for repeat) */
 243 void
 244 Player::process_video (weak_ptr<Piece> weak_piece, shared_ptr<const Image> image, Eyes eyes, bool same, VideoContent::Frame frame, Time extra)
 245 {
 246         /* Keep a note of what came in so that we can repeat it if required */
 247         _last_incoming_video.weak_piece = weak_piece;
 248         _last_incoming_video.image = image;
 249         _last_incoming_video.eyes = eyes;
 250         _last_incoming_video.same = same;
 251         _last_incoming_video.frame = frame;
 252         _last_incoming_video.extra = extra;
 253
 254         shared_ptr<Piece> piece = weak_piece.lock ();
 255         if (!piece) {
 256                 return;
 257         }
 258
 259         shared_ptr<VideoContent> content = dynamic_pointer_cast<VideoContent> (piece->content);
 260         assert (content);
 261
 262         FrameRateConversion frc (content->video_frame_rate(), _film->video_frame_rate());
 263         if (frc.skip && (frame % 2) == 1) {
 264                 return;
 265         }
 266
 267         Time const relative_time = (frame * frc.factor() * TIME_HZ / _film->video_frame_rate());
 268         if (content->trimmed (relative_time)) {
 269                 return;
 270         }
 271
 272         Time const time = content->position() + relative_time + extra - content->trim_start ();
 273         float const ratio = content->ratio() ? content->ratio()->ratio() : content->video_size_after_crop().ratio();
 274         libdcp::Size const image_size = fit_ratio_within (ratio, _video_container_size);
 275
 276         shared_ptr<PlayerImage> pi (
 277                 new PlayerImage (
 278                         image,
 279                         content->crop(),
 280                         image_size,
 281                         _video_container_size,
 282                         _film->scaler()
 283                         )
 284                 );
 285
 286         if (_film->with_subtitles () && _out_subtitle.image && time >= _out_subtitle.from && time <= _out_subtitle.to) {
 287
 288                 Position<int> const container_offset (
 289                         (_video_container_size.width - image_size.width) / 2,
 290                         (_video_container_size.height - image_size.width) / 2
 291                         );
 292
 293                 pi->set_subtitle (_out_subtitle.image, _out_subtitle.position + container_offset);
 294         }
 295
 296 #ifdef DCPOMATIC_DEBUG
 297         _last_video = piece->content;
 298 #endif
 299
 300         Video (pi, eyes, content->colour_conversion(), same, time);
 301
 302         _last_emit_was_black = false;
 303         _video_position = piece->video_position = (time + TIME_HZ / _film->video_frame_rate());
 304
 305         if (frc.repeat > 1 && !piece->repeating ()) {
 306                 piece->set_repeat (_last_incoming_video, frc.repeat - 1);
 307         }
 308 }
 309
 310 void
 311 Player::process_audio (weak_ptr<Piece> weak_piece, shared_ptr<const AudioBuffers> audio, AudioContent::Frame frame)
 312 {
 313         shared_ptr<Piece> piece = weak_piece.lock ();
 314         if (!piece) {
 315                 return;
 316         }
 317
 318         shared_ptr<AudioContent> content = dynamic_pointer_cast<AudioContent> (piece->content);
 319         assert (content);
 320
 321         /* Gain */
 322         if (content->audio_gain() != 0) {
 323                 shared_ptr<AudioBuffers> gain (new AudioBuffers (audio));
 324                 gain->apply_gain (content->audio_gain ());
 325                 audio = gain;
 326         }
 327
 328         /* Resample */
 329         if (content->content_audio_frame_rate() != content->output_audio_frame_rate()) {
 330                 shared_ptr<Resampler> r = resampler (content, true);
 331                 pair<shared_ptr<const AudioBuffers>, AudioContent::Frame> ro = r->run (audio, frame);
 332                 audio = ro.first;
 333                 frame = ro.second;
 334         }
 335
 336         Time const relative_time = _film->audio_frames_to_time (frame);
 337
 338         if (content->trimmed (relative_time)) {
 339                 return;
 340         }
 341
 342         Time time = content->position() + (content->audio_delay() * TIME_HZ / 1000) + relative_time - content->trim_start ();
 343
 344         /* Remap channels */
 345         shared_ptr<AudioBuffers> dcp_mapped (new AudioBuffers (_film->audio_channels(), audio->frames()));
 346         dcp_mapped->make_silent ();
 347
 348         AudioMapping map = content->audio_mapping ();
 349         for (int i = 0; i < map.content_channels(); ++i) {
 350                 for (int j = 0; j < _film->audio_channels(); ++j) {
 351                         if (map.get (i, static_cast<libdcp::Channel> (j)) > 0) {
 352                                 dcp_mapped->accumulate_channel (
 353                                         audio.get(),
 354                                         i,
 355                                         static_cast<libdcp::Channel> (j),
 356                                         map.get (i, static_cast<libdcp::Channel> (j))
 357                                         );
 358                         }
 359                 }
 360         }
 361
 362         audio = dcp_mapped;
 363
 364         /* We must cut off anything that comes before the start of all time */
 365         if (time < 0) {
 366                 int const frames = - time * _film->audio_frame_rate() / TIME_HZ;
 367                 if (frames >= audio->frames ()) {
 368                         return;
 369                 }
 370
 371                 shared_ptr<AudioBuffers> trimmed (new AudioBuffers (audio->channels(), audio->frames() - frames));
 372                 trimmed->copy_from (audio.get(), audio->frames() - frames, frames, 0);
 373
 374                 audio = trimmed;
 375                 time = 0;
 376         }
 377
 378         _audio_merger.push (audio, time);
 379         piece->audio_position += _film->audio_frames_to_time (audio->frames ());
 380 }
 381
 382 void
 383 Player::flush ()
 384 {
 385         TimedAudioBuffers<Time> tb = _audio_merger.flush ();
 386         if (_audio && tb.audio) {
 387                 Audio (tb.audio, tb.time);
 388                 _audio_position += _film->audio_frames_to_time (tb.audio->frames ());
 389         }
 390
 391         while (_video && _video_position < _audio_position) {
 392                 emit_black ();
 393         }
 394
 395         while (_audio && _audio_position < _video_position) {
 396                 emit_silence (_film->time_to_audio_frames (_video_position - _audio_position));
 397         }
 398
 399 }
 400
 401 /** Seek so that the next pass() will yield (approximately) the requested frame.
 402  *  Pass accurate = true to try harder to get close to the request.
 403  *  @return true on error
 404  */
 405 void
 406 Player::seek (Time t, bool accurate)
 407 {
 408         if (!_have_valid_pieces) {
 409                 setup_pieces ();
 410         }
 411
 412         if (_pieces.empty ()) {
 413                 return;
 414         }
 415
 416         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 417                 shared_ptr<VideoContent> vc = dynamic_pointer_cast<VideoContent> ((*i)->content);
 418                 if (!vc) {
 419                         continue;
 420                 }
 421
 422                 /* s is the offset of t from the start position of this content */
 423                 Time s = t - vc->position ();
 424                 s = max (static_cast<Time> (0), s);
 425                 s = min (vc->length_after_trim(), s);
 426
 427                 /* Hence set the piece positions to the `global' time */
 428                 (*i)->video_position = (*i)->audio_position = vc->position() + s;
 429
 430                 /* And seek the decoder */
 431                 dynamic_pointer_cast<VideoDecoder>((*i)->decoder)->seek (
 432                         vc->time_to_content_video_frames (s + vc->trim_start ()), accurate
 433                         );
 434
 435                 (*i)->reset_repeat ();
 436         }
 437
 438         _video_position = _audio_position = t;
 439
 440         /* XXX: don't seek audio because we don't need to... */
 441 }
 442
 443 void
 444 Player::setup_pieces ()
 445 {
 446         list<shared_ptr<Piece> > old_pieces = _pieces;
 447
 448         _pieces.clear ();
 449
 450         ContentList content = _playlist->content ();
 451         sort (content.begin(), content.end(), ContentSorter ());
 452
 453         for (ContentList::iterator i = content.begin(); i != content.end(); ++i) {
 454
 455                 shared_ptr<Piece> piece (new Piece (*i));
 456
 457                 /* XXX: into content? */
 458
 459                 shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 460                 if (fc) {
 461                         shared_ptr<FFmpegDecoder> fd (new FFmpegDecoder (_film, fc, _video, _audio));
 462
 463                         fd->Video.connect (bind (&Player::process_video, this, weak_ptr<Piece> (piece), _1, _2, _3, _4, 0));
 464                         fd->Audio.connect (bind (&Player::process_audio, this, weak_ptr<Piece> (piece), _1, _2));
 465                         fd->Subtitle.connect (bind (&Player::process_subtitle, this, weak_ptr<Piece> (piece), _1, _2, _3, _4));
 466
 467                         fd->seek (fc->time_to_content_video_frames (fc->trim_start ()), true);
 468                         piece->decoder = fd;
 469                 }
 470
 471                 shared_ptr<const ImageContent> ic = dynamic_pointer_cast<const ImageContent> (*i);
 472                 if (ic) {
 473                         bool reusing = false;
 474
 475                         /* See if we can re-use an old ImageDecoder */
 476                         for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
 477                                 shared_ptr<ImageDecoder> imd = dynamic_pointer_cast<ImageDecoder> ((*j)->decoder);
 478                                 if (imd && imd->content() == ic) {
 479                                         piece = *j;
 480                                         reusing = true;
 481                                 }
 482                         }
 483
 484                         if (!reusing) {
 485                                 shared_ptr<ImageDecoder> id (new ImageDecoder (_film, ic));
 486                                 id->Video.connect (bind (&Player::process_video, this, weak_ptr<Piece> (piece), _1, _2, _3, _4, 0));
 487                                 piece->decoder = id;
 488                         }
 489                 }
 490
 491                 shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
 492                 if (sc) {
 493                         shared_ptr<AudioDecoder> sd (new SndfileDecoder (_film, sc));
 494                         sd->Audio.connect (bind (&Player::process_audio, this, weak_ptr<Piece> (piece), _1, _2));
 495
 496                         piece->decoder = sd;
 497                 }
 498
 499                 _pieces.push_back (piece);
 500         }
 501
 502         _have_valid_pieces = true;
 503 }
 504
 505 void
 506 Player::content_changed (weak_ptr<Content> w, int property, bool frequent)
 507 {
 508         shared_ptr<Content> c = w.lock ();
 509         if (!c) {
 510                 return;
 511         }
 512
 513         if (
 514                 property == ContentProperty::POSITION || property == ContentProperty::LENGTH ||
 515                 property == ContentProperty::TRIM_START || property == ContentProperty::TRIM_END ||
 516                 property == VideoContentProperty::VIDEO_FRAME_TYPE
 517                 ) {
 518
 519                 _have_valid_pieces = false;
 520                 Changed (frequent);
 521
 522         } else if (property == SubtitleContentProperty::SUBTITLE_OFFSET || property == SubtitleContentProperty::SUBTITLE_SCALE) {
 523
 524                 update_subtitle ();
 525                 Changed (frequent);
 526
 527         } else if (property == VideoContentProperty::VIDEO_CROP || property == VideoContentProperty::VIDEO_RATIO) {
 528
 529                 Changed (frequent);
 530
 531         } else if (property == ContentProperty::PATH) {
 532
 533                 Changed (frequent);
 534         }
 535 }
 536
 537 void
 538 Player::playlist_changed ()
 539 {
 540         _have_valid_pieces = false;
 541         Changed (false);
 542 }
 543
 544 void
 545 Player::set_video_container_size (libdcp::Size s)
 546 {
 547         _video_container_size = s;
 548
 549         shared_ptr<Image> im (new Image (PIX_FMT_RGB24, _video_container_size, true));
 550         im->make_black ();
 551
 552         _black_frame.reset (
 553                 new PlayerImage (
 554                         im,
 555                         Crop(),
 556                         _video_container_size,
 557                         _video_container_size,
 558                         Scaler::from_id ("bicubic")
 559                         )
 560                 );
 561 }
 562
 563 shared_ptr<Resampler>
 564 Player::resampler (shared_ptr<AudioContent> c, bool create)
 565 {
 566         map<shared_ptr<AudioContent>, shared_ptr<Resampler> >::iterator i = _resamplers.find (c);
 567         if (i != _resamplers.end ()) {
 568                 return i->second;
 569         }
 570
 571         if (!create) {
 572                 return shared_ptr<Resampler> ();
 573         }
 574
 575         _film->log()->log (
 576                 String::compose (
 577                         "Creating new resampler for %1 to %2 with %3 channels", c->content_audio_frame_rate(), c->output_audio_frame_rate(), c->audio_channels()
 578                         )
 579                 );
 580
 581         shared_ptr<Resampler> r (new Resampler (c->content_audio_frame_rate(), c->output_audio_frame_rate(), c->audio_channels()));
 582         _resamplers[c] = r;
 583         return r;
 584 }
 585
 586 void
 587 Player::emit_black ()
 588 {
 589 #ifdef DCPOMATIC_DEBUG
 590         _last_video.reset ();
 591 #endif
 592
 593         Video (_black_frame, EYES_BOTH, ColourConversion(), _last_emit_was_black, _video_position);
 594         _video_position += _film->video_frames_to_time (1);
 595         _last_emit_was_black = true;
 596 }
 597
 598 void
 599 Player::emit_silence (OutputAudioFrame most)
 600 {
 601         if (most == 0) {
 602                 return;
 603         }
 604
 605         OutputAudioFrame N = min (most, _film->audio_frame_rate() / 2);
 606         shared_ptr<AudioBuffers> silence (new AudioBuffers (_film->audio_channels(), N));
 607         silence->make_silent ();
 608         Audio (silence, _audio_position);
 609         _audio_position += _film->audio_frames_to_time (N);
 610 }
 611
 612 void
 613 Player::film_changed (Film::Property p)
 614 {
 615         /* Here we should notice Film properties that affect our output, and
 616            alert listeners that our output now would be different to how it was
 617            last time we were run.
 618         */
 619
 620         if (p == Film::SCALER || p == Film::WITH_SUBTITLES || p == Film::CONTAINER) {
 621                 Changed (false);
 622         }
 623 }
 624
 625 void
 626 Player::process_subtitle (weak_ptr<Piece> weak_piece, shared_ptr<Image> image, dcpomatic::Rect<double> rect, Time from, Time to)
 627 {
 628         _in_subtitle.piece = weak_piece;
 629         _in_subtitle.image = image;
 630         _in_subtitle.rect = rect;
 631         _in_subtitle.from = from;
 632         _in_subtitle.to = to;
 633
 634         update_subtitle ();
 635 }
 636
 637 void
 638 Player::update_subtitle ()
 639 {
 640         shared_ptr<Piece> piece = _in_subtitle.piece.lock ();
 641         if (!piece) {
 642                 return;
 643         }
 644
 645         if (!_in_subtitle.image) {
 646                 _out_subtitle.image.reset ();
 647                 return;
 648         }
 649
 650         shared_ptr<SubtitleContent> sc = dynamic_pointer_cast<SubtitleContent> (piece->content);
 651         assert (sc);
 652
 653         dcpomatic::Rect<double> in_rect = _in_subtitle.rect;
 654         libdcp::Size scaled_size;
 655
 656         in_rect.y += sc->subtitle_offset ();
 657
 658         /* We will scale the subtitle up to fit _video_container_size, and also by the additional subtitle_scale */
 659         scaled_size.width = in_rect.width * _video_container_size.width * sc->subtitle_scale ();
 660         scaled_size.height = in_rect.height * _video_container_size.height * sc->subtitle_scale ();
 661
 662         /* Then we need a corrective translation, consisting of two parts:
 663          *
 664          * 1.  that which is the result of the scaling of the subtitle by _video_container_size; this will be
 665          *     rect.x * _video_container_size.width and rect.y * _video_container_size.height.
 666          *
 667          * 2.  that to shift the origin of the scale by subtitle_scale to the centre of the subtitle; this will be
 668          *     (width_before_subtitle_scale * (1 - subtitle_scale) / 2) and
 669          *     (height_before_subtitle_scale * (1 - subtitle_scale) / 2).
 670          *
 671          * Combining these two translations gives these expressions.
 672          */
 673
 674         _out_subtitle.position.x = rint (_video_container_size.width * (in_rect.x + (in_rect.width * (1 - sc->subtitle_scale ()) / 2)));
 675         _out_subtitle.position.y = rint (_video_container_size.height * (in_rect.y + (in_rect.height * (1 - sc->subtitle_scale ()) / 2)));
 676
 677         _out_subtitle.image = _in_subtitle.image->scale (
 678                 scaled_size,
 679                 Scaler::from_id ("bicubic"),
 680                 _in_subtitle.image->pixel_format (),
 681                 true
 682                 );
 683         _out_subtitle.from = _in_subtitle.from + piece->content->position ();
 684         _out_subtitle.to = _in_subtitle.to + piece->content->position ();
 685 }
 686
 687 /** Re-emit the last frame that was emitted, using current settings for crop, ratio, scaler and subtitles.
 688  *  @return false if this could not be done.
 689  */
 690 bool
 691 Player::repeat_last_video ()
 692 {
 693         if (!_last_incoming_video.image || !_have_valid_pieces) {
 694                 return false;
 695         }
 696
 697         process_video (
 698                 _last_incoming_video.weak_piece,
 699                 _last_incoming_video.image,
 700                 _last_incoming_video.eyes,
 701                 _last_incoming_video.same,
 702                 _last_incoming_video.frame,
 703                 _last_incoming_video.extra
 704                 );
 705
 706         return true;
 707 }
 708
 709 PlayerImage::PlayerImage (
 710         shared_ptr<const Image> in,
 711         Crop crop,
 712         libdcp::Size inter_size,
 713         libdcp::Size out_size,
 714         Scaler const * scaler
 715         )
 716         : _in (in)
 717         , _crop (crop)
 718         , _inter_size (inter_size)
 719         , _out_size (out_size)
 720         , _scaler (scaler)
 721 {
 722
 723 }
 724
 725 void
 726 PlayerImage::set_subtitle (shared_ptr<const Image> image, Position<int> pos)
 727 {
 728         _subtitle_image = image;
 729         _subtitle_position = pos;
 730 }
 731
 732 shared_ptr<Image>
 733 PlayerImage::image ()
 734 {
 735         shared_ptr<Image> out = _in->crop_scale_window (_crop, _inter_size, _out_size, _scaler, PIX_FMT_RGB24, false);
 736
 737         Position<int> const container_offset ((_out_size.width - _inter_size.width) / 2, (_out_size.height - _inter_size.width) / 2);
 738
 739         if (_subtitle_image) {
 740                 out->alpha_blend (_subtitle_image, _subtitle_position);
 741         }
 742
 743         return out;
 744 }