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         list<pair<int, libdcp::Channel> > map = content->audio_mapping().content_to_dcp ();
 348         for (list<pair<int, libdcp::Channel> >::iterator i = map.begin(); i != map.end(); ++i) {
 349                 if (i->first < audio->channels() && i->second < dcp_mapped->channels()) {
 350                         dcp_mapped->accumulate_channel (audio.get(), i->first, i->second);
 351                 }
 352         }
 353
 354         audio = dcp_mapped;
 355
 356         /* We must cut off anything that comes before the start of all time */
 357         if (time < 0) {
 358                 int const frames = - time * _film->audio_frame_rate() / TIME_HZ;
 359                 if (frames >= audio->frames ()) {
 360                         return;
 361                 }
 362
 363                 shared_ptr<AudioBuffers> trimmed (new AudioBuffers (audio->channels(), audio->frames() - frames));
 364                 trimmed->copy_from (audio.get(), audio->frames() - frames, frames, 0);
 365
 366                 audio = trimmed;
 367                 time = 0;
 368         }
 369
 370         _audio_merger.push (audio, time);
 371         piece->audio_position += _film->audio_frames_to_time (audio->frames ());
 372 }
 373
 374 void
 375 Player::flush ()
 376 {
 377         TimedAudioBuffers<Time> tb = _audio_merger.flush ();
 378         if (_audio && tb.audio) {
 379                 Audio (tb.audio, tb.time);
 380                 _audio_position += _film->audio_frames_to_time (tb.audio->frames ());
 381         }
 382
 383         while (_video && _video_position < _audio_position) {
 384                 emit_black ();
 385         }
 386
 387         while (_audio && _audio_position < _video_position) {
 388                 emit_silence (_film->time_to_audio_frames (_video_position - _audio_position));
 389         }
 390
 391 }
 392
 393 /** Seek so that the next pass() will yield (approximately) the requested frame.
 394  *  Pass accurate = true to try harder to get close to the request.
 395  *  @return true on error
 396  */
 397 void
 398 Player::seek (Time t, bool accurate)
 399 {
 400         if (!_have_valid_pieces) {
 401                 setup_pieces ();
 402         }
 403
 404         if (_pieces.empty ()) {
 405                 return;
 406         }
 407
 408         for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 409                 shared_ptr<VideoContent> vc = dynamic_pointer_cast<VideoContent> ((*i)->content);
 410                 if (!vc) {
 411                         continue;
 412                 }
 413
 414                 /* s is the offset of t from the start position of this content */
 415                 Time s = t - vc->position ();
 416                 s = max (static_cast<Time> (0), s);
 417                 s = min (vc->length_after_trim(), s);
 418
 419                 /* Hence set the piece positions to the `global' time */
 420                 (*i)->video_position = (*i)->audio_position = vc->position() + s;
 421
 422                 /* And seek the decoder */
 423                 dynamic_pointer_cast<VideoDecoder>((*i)->decoder)->seek (
 424                         vc->time_to_content_video_frames (s + vc->trim_start ()), accurate
 425                         );
 426
 427                 (*i)->reset_repeat ();
 428         }
 429
 430         _video_position = _audio_position = t;
 431
 432         /* XXX: don't seek audio because we don't need to... */
 433 }
 434
 435 void
 436 Player::setup_pieces ()
 437 {
 438         list<shared_ptr<Piece> > old_pieces = _pieces;
 439
 440         _pieces.clear ();
 441
 442         ContentList content = _playlist->content ();
 443         sort (content.begin(), content.end(), ContentSorter ());
 444
 445         for (ContentList::iterator i = content.begin(); i != content.end(); ++i) {
 446
 447                 shared_ptr<Piece> piece (new Piece (*i));
 448
 449                 /* XXX: into content? */
 450
 451                 shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
 452                 if (fc) {
 453                         shared_ptr<FFmpegDecoder> fd (new FFmpegDecoder (_film, fc, _video, _audio));
 454
 455                         fd->Video.connect (bind (&Player::process_video, this, weak_ptr<Piece> (piece), _1, _2, _3, _4, 0));
 456                         fd->Audio.connect (bind (&Player::process_audio, this, weak_ptr<Piece> (piece), _1, _2));
 457                         fd->Subtitle.connect (bind (&Player::process_subtitle, this, weak_ptr<Piece> (piece), _1, _2, _3, _4));
 458
 459                         fd->seek (fc->time_to_content_video_frames (fc->trim_start ()), true);
 460                         piece->decoder = fd;
 461                 }
 462
 463                 shared_ptr<const ImageContent> ic = dynamic_pointer_cast<const ImageContent> (*i);
 464                 if (ic) {
 465                         bool reusing = false;
 466
 467                         /* See if we can re-use an old ImageDecoder */
 468                         for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
 469                                 shared_ptr<ImageDecoder> imd = dynamic_pointer_cast<ImageDecoder> ((*j)->decoder);
 470                                 if (imd && imd->content() == ic) {
 471                                         piece = *j;
 472                                         reusing = true;
 473                                 }
 474                         }
 475
 476                         if (!reusing) {
 477                                 shared_ptr<ImageDecoder> id (new ImageDecoder (_film, ic));
 478                                 id->Video.connect (bind (&Player::process_video, this, weak_ptr<Piece> (piece), _1, _2, _3, _4, 0));
 479                                 piece->decoder = id;
 480                         }
 481                 }
 482
 483                 shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
 484                 if (sc) {
 485                         shared_ptr<AudioDecoder> sd (new SndfileDecoder (_film, sc));
 486                         sd->Audio.connect (bind (&Player::process_audio, this, weak_ptr<Piece> (piece), _1, _2));
 487
 488                         piece->decoder = sd;
 489                 }
 490
 491                 _pieces.push_back (piece);
 492         }
 493
 494         _have_valid_pieces = true;
 495 }
 496
 497 void
 498 Player::content_changed (weak_ptr<Content> w, int property, bool frequent)
 499 {
 500         shared_ptr<Content> c = w.lock ();
 501         if (!c) {
 502                 return;
 503         }
 504
 505         if (
 506                 property == ContentProperty::POSITION || property == ContentProperty::LENGTH ||
 507                 property == ContentProperty::TRIM_START || property == ContentProperty::TRIM_END ||
 508                 property == VideoContentProperty::VIDEO_FRAME_TYPE
 509                 ) {
 510
 511                 _have_valid_pieces = false;
 512                 Changed (frequent);
 513
 514         } else if (property == SubtitleContentProperty::SUBTITLE_OFFSET || property == SubtitleContentProperty::SUBTITLE_SCALE) {
 515
 516                 update_subtitle ();
 517                 Changed (frequent);
 518
 519         } else if (property == VideoContentProperty::VIDEO_CROP || property == VideoContentProperty::VIDEO_RATIO) {
 520
 521                 Changed (frequent);
 522
 523         } else if (property == ContentProperty::PATH) {
 524
 525                 Changed (frequent);
 526         }
 527 }
 528
 529 void
 530 Player::playlist_changed ()
 531 {
 532         _have_valid_pieces = false;
 533         Changed (false);
 534 }
 535
 536 void
 537 Player::set_video_container_size (libdcp::Size s)
 538 {
 539         _video_container_size = s;
 540
 541         shared_ptr<Image> im (new Image (PIX_FMT_RGB24, _video_container_size, true));
 542         im->make_black ();
 543
 544         _black_frame.reset (
 545                 new PlayerImage (
 546                         im,
 547                         Crop(),
 548                         _video_container_size,
 549                         _video_container_size,
 550                         Scaler::from_id ("bicubic")
 551                         )
 552                 );
 553 }
 554
 555 shared_ptr<Resampler>
 556 Player::resampler (shared_ptr<AudioContent> c, bool create)
 557 {
 558         map<shared_ptr<AudioContent>, shared_ptr<Resampler> >::iterator i = _resamplers.find (c);
 559         if (i != _resamplers.end ()) {
 560                 return i->second;
 561         }
 562
 563         if (!create) {
 564                 return shared_ptr<Resampler> ();
 565         }
 566
 567         _film->log()->log (
 568                 String::compose (
 569                         "Creating new resampler for %1 to %2 with %3 channels", c->content_audio_frame_rate(), c->output_audio_frame_rate(), c->audio_channels()
 570                         )
 571                 );
 572
 573         shared_ptr<Resampler> r (new Resampler (c->content_audio_frame_rate(), c->output_audio_frame_rate(), c->audio_channels()));
 574         _resamplers[c] = r;
 575         return r;
 576 }
 577
 578 void
 579 Player::emit_black ()
 580 {
 581 #ifdef DCPOMATIC_DEBUG
 582         _last_video.reset ();
 583 #endif
 584
 585         Video (_black_frame, EYES_BOTH, ColourConversion(), _last_emit_was_black, _video_position);
 586         _video_position += _film->video_frames_to_time (1);
 587         _last_emit_was_black = true;
 588 }
 589
 590 void
 591 Player::emit_silence (OutputAudioFrame most)
 592 {
 593         if (most == 0) {
 594                 return;
 595         }
 596
 597         OutputAudioFrame N = min (most, _film->audio_frame_rate() / 2);
 598         shared_ptr<AudioBuffers> silence (new AudioBuffers (_film->audio_channels(), N));
 599         silence->make_silent ();
 600         Audio (silence, _audio_position);
 601         _audio_position += _film->audio_frames_to_time (N);
 602 }
 603
 604 void
 605 Player::film_changed (Film::Property p)
 606 {
 607         /* Here we should notice Film properties that affect our output, and
 608            alert listeners that our output now would be different to how it was
 609            last time we were run.
 610         */
 611
 612         if (p == Film::SCALER || p == Film::WITH_SUBTITLES || p == Film::CONTAINER) {
 613                 Changed (false);
 614         }
 615 }
 616
 617 void
 618 Player::process_subtitle (weak_ptr<Piece> weak_piece, shared_ptr<Image> image, dcpomatic::Rect<double> rect, Time from, Time to)
 619 {
 620         _in_subtitle.piece = weak_piece;
 621         _in_subtitle.image = image;
 622         _in_subtitle.rect = rect;
 623         _in_subtitle.from = from;
 624         _in_subtitle.to = to;
 625
 626         update_subtitle ();
 627 }
 628
 629 void
 630 Player::update_subtitle ()
 631 {
 632         shared_ptr<Piece> piece = _in_subtitle.piece.lock ();
 633         if (!piece) {
 634                 return;
 635         }
 636
 637         if (!_in_subtitle.image) {
 638                 _out_subtitle.image.reset ();
 639                 return;
 640         }
 641
 642         shared_ptr<SubtitleContent> sc = dynamic_pointer_cast<SubtitleContent> (piece->content);
 643         assert (sc);
 644
 645         dcpomatic::Rect<double> in_rect = _in_subtitle.rect;
 646         libdcp::Size scaled_size;
 647
 648         in_rect.y += sc->subtitle_offset ();
 649
 650         /* We will scale the subtitle up to fit _video_container_size, and also by the additional subtitle_scale */
 651         scaled_size.width = in_rect.width * _video_container_size.width * sc->subtitle_scale ();
 652         scaled_size.height = in_rect.height * _video_container_size.height * sc->subtitle_scale ();
 653
 654         /* Then we need a corrective translation, consisting of two parts:
 655          *
 656          * 1.  that which is the result of the scaling of the subtitle by _video_container_size; this will be
 657          *     rect.x * _video_container_size.width and rect.y * _video_container_size.height.
 658          *
 659          * 2.  that to shift the origin of the scale by subtitle_scale to the centre of the subtitle; this will be
 660          *     (width_before_subtitle_scale * (1 - subtitle_scale) / 2) and
 661          *     (height_before_subtitle_scale * (1 - subtitle_scale) / 2).
 662          *
 663          * Combining these two translations gives these expressions.
 664          */
 665
 666         _out_subtitle.position.x = rint (_video_container_size.width * (in_rect.x + (in_rect.width * (1 - sc->subtitle_scale ()) / 2)));
 667         _out_subtitle.position.y = rint (_video_container_size.height * (in_rect.y + (in_rect.height * (1 - sc->subtitle_scale ()) / 2)));
 668
 669         _out_subtitle.image = _in_subtitle.image->scale (
 670                 scaled_size,
 671                 Scaler::from_id ("bicubic"),
 672                 _in_subtitle.image->pixel_format (),
 673                 true
 674                 );
 675         _out_subtitle.from = _in_subtitle.from + piece->content->position ();
 676         _out_subtitle.to = _in_subtitle.to + piece->content->position ();
 677 }
 678
 679 /** Re-emit the last frame that was emitted, using current settings for crop, ratio, scaler and subtitles.
 680  *  @return false if this could not be done.
 681  */
 682 bool
 683 Player::repeat_last_video ()
 684 {
 685         if (!_last_incoming_video.image || !_have_valid_pieces) {
 686                 return false;
 687         }
 688
 689         process_video (
 690                 _last_incoming_video.weak_piece,
 691                 _last_incoming_video.image,
 692                 _last_incoming_video.eyes,
 693                 _last_incoming_video.same,
 694                 _last_incoming_video.frame,
 695                 _last_incoming_video.extra
 696                 );
 697
 698         return true;
 699 }
 700
 701 PlayerImage::PlayerImage (
 702         shared_ptr<const Image> in,
 703         Crop crop,
 704         libdcp::Size inter_size,
 705         libdcp::Size out_size,
 706         Scaler const * scaler
 707         )
 708         : _in (in)
 709         , _crop (crop)
 710         , _inter_size (inter_size)
 711         , _out_size (out_size)
 712         , _scaler (scaler)
 713 {
 714
 715 }
 716
 717 void
 718 PlayerImage::set_subtitle (shared_ptr<const Image> image, Position<int> pos)
 719 {
 720         _subtitle_image = image;
 721         _subtitle_position = pos;
 722 }
 723
 724 shared_ptr<Image>
 725 PlayerImage::image ()
 726 {
 727         shared_ptr<Image> out = _in->crop_scale_window (_crop, _inter_size, _out_size, _scaler, PIX_FMT_RGB24, false);
 728
 729         Position<int> const container_offset ((_out_size.width - _inter_size.width) / 2, (_out_size.height - _inter_size.width) / 2);
 730
 731         if (_subtitle_image) {
 732                 out->alpha_blend (_subtitle_image, _subtitle_position);
 733         }
 734
 735         return out;
 736 }