src/lib/player.cc

   1 /*
   2     Copyright (C) 2013-2015 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 "player.h"
  21 #include "film.h"
  22 #include "ffmpeg_decoder.h"
  23 #include "audio_buffers.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 "text_subtitle_decoder.h"
  31 #include "text_subtitle_content.h"
  32 #include "dcp_content.h"
  33 #include "job.h"
  34 #include "image.h"
  35 #include "raw_image_proxy.h"
  36 #include "ratio.h"
  37 #include "log.h"
  38 #include "render_subtitles.h"
  39 #include "config.h"
  40 #include "content_video.h"
  41 #include "player_video.h"
  42 #include "frame_rate_change.h"
  43 #include "dcp_content.h"
  44 #include "dcp_decoder.h"
  45 #include "dcp_subtitle_content.h"
  46 #include "dcp_subtitle_decoder.h"
  47 #include "audio_processor.h"
  48 #include "playlist.h"
  49 #include "referenced_reel_asset.h"
  50 #include <dcp/reel.h>
  51 #include <dcp/reel_sound_asset.h>
  52 #include <dcp/reel_subtitle_asset.h>
  53 #include <dcp/reel_picture_asset.h>
  54 #include <boost/foreach.hpp>
  55 #include <stdint.h>
  56 #include <algorithm>
  57 #include <iostream>
  58
  59 #include "i18n.h"
  60
  61 #define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), LogEntry::TYPE_GENERAL);
  62
  63 using std::list;
  64 using std::cout;
  65 using std::min;
  66 using std::max;
  67 using std::min;
  68 using std::vector;
  69 using std::pair;
  70 using std::map;
  71 using std::make_pair;
  72 using std::copy;
  73 using boost::shared_ptr;
  74 using boost::weak_ptr;
  75 using boost::dynamic_pointer_cast;
  76 using boost::optional;
  77 using boost::scoped_ptr;
  78
  79 Player::Player (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
  80         : _film (film)
  81         , _playlist (playlist)
  82         , _have_valid_pieces (false)
  83         , _ignore_video (false)
  84         , _ignore_audio (false)
  85         , _always_burn_subtitles (false)
  86         , _fast (false)
  87         , _play_referenced (false)
  88 {
  89         _film_changed_connection = _film->Changed.connect (bind (&Player::film_changed, this, _1));
  90         _playlist_changed_connection = _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  91         _playlist_content_changed_connection = _playlist->ContentChanged.connect (bind (&Player::playlist_content_changed, this, _1, _2, _3));
  92         set_video_container_size (_film->frame_size ());
  93
  94         film_changed (Film::AUDIO_PROCESSOR);
  95 }
  96
  97 void
  98 Player::setup_pieces ()
  99 {
 100         list<shared_ptr<Piece> > old_pieces = _pieces;
 101         _pieces.clear ();
 102
 103         BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
 104
 105                 if (!i->paths_valid ()) {
 106                         continue;
 107                 }
 108
 109                 shared_ptr<Decoder> decoder;
 110                 optional<FrameRateChange> frc;
 111
 112                 /* FFmpeg */
 113                 shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (i);
 114                 if (fc) {
 115                         decoder.reset (new FFmpegDecoder (fc, _film->log(), _fast));
 116                         frc = FrameRateChange (fc->video_frame_rate(), _film->video_frame_rate());
 117                 }
 118
 119                 shared_ptr<const DCPContent> dc = dynamic_pointer_cast<const DCPContent> (i);
 120                 if (dc) {
 121                         decoder.reset (new DCPDecoder (dc, _fast));
 122                         frc = FrameRateChange (dc->video_frame_rate(), _film->video_frame_rate());
 123                 }
 124
 125                 /* ImageContent */
 126                 shared_ptr<const ImageContent> ic = dynamic_pointer_cast<const ImageContent> (i);
 127                 if (ic) {
 128                         /* See if we can re-use an old ImageDecoder */
 129                         for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
 130                                 shared_ptr<ImageDecoder> imd = dynamic_pointer_cast<ImageDecoder> ((*j)->decoder);
 131                                 if (imd && imd->content() == ic) {
 132                                         decoder = imd;
 133                                 }
 134                         }
 135
 136                         if (!decoder) {
 137                                 decoder.reset (new ImageDecoder (ic));
 138                         }
 139
 140                         frc = FrameRateChange (ic->video_frame_rate(), _film->video_frame_rate());
 141                 }
 142
 143                 /* SndfileContent */
 144                 shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (i);
 145                 if (sc) {
 146                         decoder.reset (new SndfileDecoder (sc, _fast));
 147
 148                         /* Work out a FrameRateChange for the best overlap video for this content */
 149                         DCPTime best_overlap_t;
 150                         shared_ptr<VideoContent> best_overlap;
 151                         BOOST_FOREACH (shared_ptr<Content> j, _playlist->content ()) {
 152                                 shared_ptr<VideoContent> vc = dynamic_pointer_cast<VideoContent> (j);
 153                                 if (!vc) {
 154                                         continue;
 155                                 }
 156
 157                                 DCPTime const overlap = min (vc->end(), i->end()) - max (vc->position(), i->position());
 158                                 if (overlap > best_overlap_t) {
 159                                         best_overlap = vc;
 160                                         best_overlap_t = overlap;
 161                                 }
 162                         }
 163
 164                         if (best_overlap) {
 165                                 frc = FrameRateChange (best_overlap->video_frame_rate(), _film->video_frame_rate ());
 166                         } else {
 167                                 /* No video overlap; e.g. if the DCP is just audio */
 168                                 frc = FrameRateChange (_film->video_frame_rate(), _film->video_frame_rate ());
 169                         }
 170                 }
 171
 172                 /* It's questionable whether subtitle content should have a video frame rate; perhaps
 173                    it should be assumed that any subtitle content has been prepared at the same rate
 174                    as simultaneous video content (like we do with audio).
 175                 */
 176
 177                 /* TextSubtitleContent */
 178                 shared_ptr<const TextSubtitleContent> rc = dynamic_pointer_cast<const TextSubtitleContent> (i);
 179                 if (rc) {
 180                         decoder.reset (new TextSubtitleDecoder (rc));
 181                         frc = FrameRateChange (rc->subtitle_video_frame_rate(), _film->video_frame_rate());
 182                 }
 183
 184                 /* DCPSubtitleContent */
 185                 shared_ptr<const DCPSubtitleContent> dsc = dynamic_pointer_cast<const DCPSubtitleContent> (i);
 186                 if (dsc) {
 187                         decoder.reset (new DCPSubtitleDecoder (dsc));
 188                         frc = FrameRateChange (dsc->subtitle_video_frame_rate(), _film->video_frame_rate());
 189                 }
 190
 191                 shared_ptr<VideoDecoder> vd = dynamic_pointer_cast<VideoDecoder> (decoder);
 192                 if (vd && _ignore_video) {
 193                         vd->set_ignore_video ();
 194                 }
 195
 196                 shared_ptr<AudioDecoder> ad = dynamic_pointer_cast<AudioDecoder> (decoder);
 197                 if (ad && _ignore_audio) {
 198                         ad->set_ignore_audio ();
 199                 }
 200
 201                 _pieces.push_back (shared_ptr<Piece> (new Piece (i, decoder, frc.get ())));
 202         }
 203
 204         _have_valid_pieces = true;
 205 }
 206
 207 void
 208 Player::playlist_content_changed (weak_ptr<Content> w, int property, bool frequent)
 209 {
 210         shared_ptr<Content> c = w.lock ();
 211         if (!c) {
 212                 return;
 213         }
 214
 215         if (
 216                 property == ContentProperty::POSITION ||
 217                 property == ContentProperty::LENGTH ||
 218                 property == ContentProperty::TRIM_START ||
 219                 property == ContentProperty::TRIM_END ||
 220                 property == ContentProperty::PATH ||
 221                 property == VideoContentProperty::VIDEO_FRAME_TYPE ||
 222                 property == DCPContentProperty::CAN_BE_PLAYED ||
 223                 property == TextSubtitleContentProperty::TEXT_SUBTITLE_COLOUR ||
 224                 property == TextSubtitleContentProperty::TEXT_SUBTITLE_OUTLINE ||
 225                 property == TextSubtitleContentProperty::TEXT_SUBTITLE_OUTLINE_COLOUR
 226                 ) {
 227
 228                 _have_valid_pieces = false;
 229                 Changed (frequent);
 230
 231         } else if (
 232                 property == SubtitleContentProperty::USE_SUBTITLES ||
 233                 property == SubtitleContentProperty::SUBTITLE_X_OFFSET ||
 234                 property == SubtitleContentProperty::SUBTITLE_Y_OFFSET ||
 235                 property == SubtitleContentProperty::SUBTITLE_X_SCALE ||
 236                 property == SubtitleContentProperty::SUBTITLE_Y_SCALE ||
 237                 property == SubtitleContentProperty::FONTS ||
 238                 property == VideoContentProperty::VIDEO_CROP ||
 239                 property == VideoContentProperty::VIDEO_SCALE ||
 240                 property == VideoContentProperty::VIDEO_FRAME_RATE ||
 241                 property == VideoContentProperty::VIDEO_FADE_IN ||
 242                 property == VideoContentProperty::VIDEO_FADE_OUT ||
 243                 property == VideoContentProperty::COLOUR_CONVERSION
 244                 ) {
 245
 246                 Changed (frequent);
 247         }
 248 }
 249
 250 void
 251 Player::set_video_container_size (dcp::Size s)
 252 {
 253         _video_container_size = s;
 254
 255         _black_image.reset (new Image (AV_PIX_FMT_RGB24, _video_container_size, true));
 256         _black_image->make_black ();
 257 }
 258
 259 void
 260 Player::playlist_changed ()
 261 {
 262         _have_valid_pieces = false;
 263         Changed (false);
 264 }
 265
 266 void
 267 Player::film_changed (Film::Property p)
 268 {
 269         /* Here we should notice Film properties that affect our output, and
 270            alert listeners that our output now would be different to how it was
 271            last time we were run.
 272         */
 273
 274         if (p == Film::CONTAINER) {
 275                 Changed (false);
 276         } else if (p == Film::VIDEO_FRAME_RATE) {
 277                 /* Pieces contain a FrameRateChange which contains the DCP frame rate,
 278                    so we need new pieces here.
 279                 */
 280                 _have_valid_pieces = false;
 281                 Changed (false);
 282         } else if (p == Film::AUDIO_PROCESSOR) {
 283                 if (_film->audio_processor ()) {
 284                         _audio_processor = _film->audio_processor()->clone (_film->audio_frame_rate ());
 285                 }
 286         }
 287 }
 288
 289 list<PositionImage>
 290 Player::transform_image_subtitles (list<ImageSubtitle> subs) const
 291 {
 292         list<PositionImage> all;
 293
 294         for (list<ImageSubtitle>::const_iterator i = subs.begin(); i != subs.end(); ++i) {
 295                 if (!i->image) {
 296                         continue;
 297                 }
 298
 299                 /* We will scale the subtitle up to fit _video_container_size */
 300                 dcp::Size scaled_size (i->rectangle.width * _video_container_size.width, i->rectangle.height * _video_container_size.height);
 301
 302                 /* Then we need a corrective translation, consisting of two parts:
 303                  *
 304                  * 1.  that which is the result of the scaling of the subtitle by _video_container_size; this will be
 305                  *     rect.x * _video_container_size.width and rect.y * _video_container_size.height.
 306                  *
 307                  * 2.  that to shift the origin of the scale by subtitle_scale to the centre of the subtitle; this will be
 308                  *     (width_before_subtitle_scale * (1 - subtitle_x_scale) / 2) and
 309                  *     (height_before_subtitle_scale * (1 - subtitle_y_scale) / 2).
 310                  *
 311                  * Combining these two translations gives these expressions.
 312                  */
 313
 314                 all.push_back (
 315                         PositionImage (
 316                                 i->image->scale (
 317                                         scaled_size,
 318                                         dcp::YUV_TO_RGB_REC601,
 319                                         i->image->pixel_format (),
 320                                         true
 321                                         ),
 322                                 Position<int> (
 323                                         lrint (_video_container_size.width * i->rectangle.x),
 324                                         lrint (_video_container_size.height * i->rectangle.y)
 325                                         )
 326                                 )
 327                         );
 328         }
 329
 330         return all;
 331 }
 332
 333 shared_ptr<PlayerVideo>
 334 Player::black_player_video_frame (DCPTime time) const
 335 {
 336         return shared_ptr<PlayerVideo> (
 337                 new PlayerVideo (
 338                         shared_ptr<const ImageProxy> (new RawImageProxy (_black_image)),
 339                         time,
 340                         Crop (),
 341                         optional<double> (),
 342                         _video_container_size,
 343                         _video_container_size,
 344                         EYES_BOTH,
 345                         PART_WHOLE,
 346                         PresetColourConversion::all().front().conversion
 347                 )
 348         );
 349 }
 350
 351 /** @return All PlayerVideos at the given time.  There may be none if the content
 352  *  at `time' is a DCP which we are passing through (i.e. referring to by reference)
 353  *  or 2 if we have 3D.
 354  */
 355 list<shared_ptr<PlayerVideo> >
 356 Player::get_video (DCPTime time, bool accurate)
 357 {
 358         if (!_have_valid_pieces) {
 359                 setup_pieces ();
 360         }
 361
 362         /* Find subtitles for possible burn-in */
 363
 364         PlayerSubtitles ps = get_subtitles (time, DCPTime::from_frames (1, _film->video_frame_rate ()), false, true, accurate);
 365
 366         list<PositionImage> sub_images;
 367
 368         /* Image subtitles */
 369         list<PositionImage> c = transform_image_subtitles (ps.image);
 370         copy (c.begin(), c.end(), back_inserter (sub_images));
 371
 372         /* Text subtitles (rendered to an image) */
 373         if (!ps.text.empty ()) {
 374                 list<PositionImage> s = render_subtitles (ps.text, ps.fonts, _video_container_size);
 375                 copy (s.begin (), s.end (), back_inserter (sub_images));
 376                 cout << "got " << s.size() << " text subs rendered to images.\n";
 377         }
 378
 379         optional<PositionImage> subtitles;
 380         if (!sub_images.empty ()) {
 381                 subtitles = merge (sub_images);
 382         }
 383
 384         /* Find pieces containing video which is happening now */
 385
 386         list<shared_ptr<Piece> > ov = overlaps<VideoContent> (
 387                 time,
 388                 time + DCPTime::from_frames (1, _film->video_frame_rate ())
 389                 );
 390
 391         list<shared_ptr<PlayerVideo> > pvf;
 392
 393         if (ov.empty ()) {
 394                 /* No video content at this time */
 395                 pvf.push_back (black_player_video_frame (time));
 396         } else {
 397                 /* Some video content at this time */
 398                 shared_ptr<Piece> last = *(ov.rbegin ());
 399                 VideoFrameType const last_type = dynamic_pointer_cast<VideoContent> (last->content)->video_frame_type ();
 400
 401                 /* Get video from appropriate piece(s) */
 402                 BOOST_FOREACH (shared_ptr<Piece> piece, ov) {
 403
 404                         shared_ptr<VideoDecoder> decoder = dynamic_pointer_cast<VideoDecoder> (piece->decoder);
 405                         DCPOMATIC_ASSERT (decoder);
 406                         shared_ptr<VideoContent> video_content = dynamic_pointer_cast<VideoContent> (piece->content);
 407                         DCPOMATIC_ASSERT (video_content);
 408
 409                         shared_ptr<DCPContent> dcp_content = dynamic_pointer_cast<DCPContent> (video_content);
 410                         if (dcp_content && dcp_content->reference_video () && !_play_referenced) {
 411                                 continue;
 412                         }
 413
 414                         bool const use =
 415                                 /* always use the last video */
 416                                 piece == last ||
 417                                 /* with a corresponding L/R eye if appropriate */
 418                                 (last_type == VIDEO_FRAME_TYPE_3D_LEFT && video_content->video_frame_type() == VIDEO_FRAME_TYPE_3D_RIGHT) ||
 419                                 (last_type == VIDEO_FRAME_TYPE_3D_RIGHT && video_content->video_frame_type() == VIDEO_FRAME_TYPE_3D_LEFT);
 420
 421                         if (use) {
 422                                 /* We want to use this piece */
 423                                 list<ContentVideo> content_video = decoder->get_video (dcp_to_content_video (piece, time), accurate);
 424                                 if (content_video.empty ()) {
 425                                         pvf.push_back (black_player_video_frame (time));
 426                                 } else {
 427                                         dcp::Size image_size = video_content->scale().size (video_content, _video_container_size, _film->frame_size ());
 428
 429                                         for (list<ContentVideo>::const_iterator i = content_video.begin(); i != content_video.end(); ++i) {
 430                                                 pvf.push_back (
 431                                                         shared_ptr<PlayerVideo> (
 432                                                                 new PlayerVideo (
 433                                                                         i->image,
 434                                                                         content_video_to_dcp (piece, i->frame),
 435                                                                         video_content->crop (),
 436                                                                         video_content->fade (i->frame),
 437                                                                         image_size,
 438                                                                         _video_container_size,
 439                                                                         i->eyes,
 440                                                                         i->part,
 441                                                                         video_content->colour_conversion ()
 442                                                                         )
 443                                                                 )
 444                                                         );
 445                                         }
 446                                 }
 447                         } else {
 448                                 /* Discard unused video */
 449                                 decoder->get_video (dcp_to_content_video (piece, time), accurate);
 450                         }
 451                 }
 452         }
 453
 454         if (subtitles) {
 455                 BOOST_FOREACH (shared_ptr<PlayerVideo> p, pvf) {
 456                         p->set_subtitle (subtitles.get ());
 457                 }
 458         }
 459
 460         return pvf;
 461 }
 462
 463 /** @return Audio data or 0 if the only audio data here is referenced DCP data */
 464 shared_ptr<AudioBuffers>
 465 Player::get_audio (DCPTime time, DCPTime length, bool accurate)
 466 {
 467         if (!_have_valid_pieces) {
 468                 setup_pieces ();
 469         }
 470
 471         Frame const length_frames = length.frames_round (_film->audio_frame_rate ());
 472
 473         shared_ptr<AudioBuffers> audio (new AudioBuffers (_film->audio_channels(), length_frames));
 474         audio->make_silent ();
 475
 476         list<shared_ptr<Piece> > ov = overlaps<AudioContent> (time, time + length);
 477         if (ov.empty ()) {
 478                 return audio;
 479         }
 480
 481         bool all_referenced = true;
 482         BOOST_FOREACH (shared_ptr<Piece> i, ov) {
 483                 shared_ptr<AudioContent> audio_content = dynamic_pointer_cast<AudioContent> (i->content);
 484                 shared_ptr<DCPContent> dcp_content = dynamic_pointer_cast<DCPContent> (i->content);
 485                 if (audio_content && (!dcp_content || !dcp_content->reference_audio ())) {
 486                         /* There is audio content which is not from a DCP or not set to be referenced */
 487                         all_referenced = false;
 488                 }
 489         }
 490
 491         if (all_referenced && !_play_referenced) {
 492                 return shared_ptr<AudioBuffers> ();
 493         }
 494
 495         BOOST_FOREACH (shared_ptr<Piece> i, ov) {
 496
 497                 shared_ptr<AudioContent> content = dynamic_pointer_cast<AudioContent> (i->content);
 498                 DCPOMATIC_ASSERT (content);
 499                 shared_ptr<AudioDecoder> decoder = dynamic_pointer_cast<AudioDecoder> (i->decoder);
 500                 DCPOMATIC_ASSERT (decoder);
 501
 502                 /* The time that we should request from the content */
 503                 DCPTime request = time - DCPTime::from_seconds (content->audio_delay() / 1000.0);
 504                 Frame request_frames = length_frames;
 505                 DCPTime offset;
 506                 if (request < DCPTime ()) {
 507                         /* We went off the start of the content, so we will need to offset
 508                            the stuff we get back.
 509                         */
 510                         offset = -request;
 511                         request_frames += request.frames_round (_film->audio_frame_rate ());
 512                         if (request_frames < 0) {
 513                                 request_frames = 0;
 514                         }
 515                         request = DCPTime ();
 516                 }
 517
 518                 Frame const content_frame = dcp_to_resampled_audio (i, request);
 519
 520                 BOOST_FOREACH (AudioStreamPtr j, content->audio_streams ()) {
 521
 522                         if (j->channels() == 0) {
 523                                 /* Some content (e.g. DCPs) can have streams with no channels */
 524                                 continue;
 525                         }
 526
 527                         /* Audio from this piece's decoder stream (which might be more or less than what we asked for) */
 528                         ContentAudio all = decoder->get_audio (j, content_frame, request_frames, accurate);
 529
 530                         /* Gain */
 531                         if (content->audio_gain() != 0) {
 532                                 shared_ptr<AudioBuffers> gain (new AudioBuffers (all.audio));
 533                                 gain->apply_gain (content->audio_gain ());
 534                                 all.audio = gain;
 535                         }
 536
 537                         /* Remap channels */
 538                         shared_ptr<AudioBuffers> dcp_mapped (new AudioBuffers (_film->audio_channels(), all.audio->frames()));
 539                         dcp_mapped->make_silent ();
 540                         AudioMapping map = j->mapping ();
 541                         for (int i = 0; i < map.input_channels(); ++i) {
 542                                 for (int j = 0; j < _film->audio_channels(); ++j) {
 543                                         if (map.get (i, j) > 0) {
 544                                                 dcp_mapped->accumulate_channel (
 545                                                         all.audio.get(),
 546                                                         i,
 547                                                         j,
 548                                                         map.get (i, j)
 549                                                         );
 550                                         }
 551                                 }
 552                         }
 553
 554                         if (_audio_processor) {
 555                                 dcp_mapped = _audio_processor->run (dcp_mapped, _film->audio_channels ());
 556                         }
 557
 558                         all.audio = dcp_mapped;
 559
 560                         audio->accumulate_frames (
 561                                 all.audio.get(),
 562                                 content_frame - all.frame,
 563                                 offset.frames_round (_film->audio_frame_rate()),
 564                                 min (Frame (all.audio->frames()), request_frames)
 565                                 );
 566                 }
 567         }
 568
 569         return audio;
 570 }
 571
 572 Frame
 573 Player::dcp_to_content_video (shared_ptr<const Piece> piece, DCPTime t) const
 574 {
 575         shared_ptr<const VideoContent> vc = dynamic_pointer_cast<const VideoContent> (piece->content);
 576         DCPTime s = t - piece->content->position ();
 577         s = min (piece->content->length_after_trim(), s);
 578         s = max (DCPTime(), s + DCPTime (piece->content->trim_start(), piece->frc));
 579
 580         /* It might seem more logical here to convert s to a ContentTime (using the FrameRateChange)
 581            then convert that ContentTime to frames at the content's rate.  However this fails for
 582            situations like content at 29.9978733fps, DCP at 30fps.  The accuracy of the Time type is not
 583            enough to distinguish between the two with low values of time (e.g. 3200 in Time units).
 584
 585            Instead we convert the DCPTime using the DCP video rate then account for any skip/repeat.
 586         */
 587         return s.frames_floor (piece->frc.dcp) / piece->frc.factor ();
 588 }
 589
 590 DCPTime
 591 Player::content_video_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 592 {
 593         shared_ptr<const VideoContent> vc = dynamic_pointer_cast<const VideoContent> (piece->content);
 594         /* See comment in dcp_to_content_video */
 595         DCPTime const d = DCPTime::from_frames (f * piece->frc.factor(), piece->frc.dcp) - DCPTime (piece->content->trim_start (), piece->frc);
 596         return max (DCPTime (), d + piece->content->position ());
 597 }
 598
 599 Frame
 600 Player::dcp_to_resampled_audio (shared_ptr<const Piece> piece, DCPTime t) const
 601 {
 602         DCPTime s = t - piece->content->position ();
 603         s = min (piece->content->length_after_trim(), s);
 604         /* See notes in dcp_to_content_video */
 605         return max (DCPTime (), DCPTime (piece->content->trim_start (), piece->frc) + s).frames_floor (_film->audio_frame_rate ());
 606 }
 607
 608 ContentTime
 609 Player::dcp_to_content_subtitle (shared_ptr<const Piece> piece, DCPTime t) const
 610 {
 611         DCPTime s = t - piece->content->position ();
 612         s = min (piece->content->length_after_trim(), s);
 613         return max (ContentTime (), ContentTime (s, piece->frc) + piece->content->trim_start());
 614 }
 615
 616 DCPTime
 617 Player::content_subtitle_to_dcp (shared_ptr<const Piece> piece, ContentTime t) const
 618 {
 619         return max (DCPTime (), DCPTime (t - piece->content->trim_start(), piece->frc) + piece->content->position());
 620 }
 621
 622 /** @param burnt true to return only subtitles to be burnt, false to return only
 623  *  subtitles that should not be burnt.  This parameter will be ignored if
 624  *  _always_burn_subtitles is true; in this case, all subtitles will be returned.
 625  */
 626 PlayerSubtitles
 627 Player::get_subtitles (DCPTime time, DCPTime length, bool starting, bool burnt, bool accurate)
 628 {
 629         list<shared_ptr<Piece> > subs = overlaps<SubtitleContent> (time, time + length);
 630
 631         PlayerSubtitles ps (time, length);
 632
 633         for (list<shared_ptr<Piece> >::const_iterator j = subs.begin(); j != subs.end(); ++j) {
 634                 shared_ptr<SubtitleContent> subtitle_content = dynamic_pointer_cast<SubtitleContent> ((*j)->content);
 635                 if (!subtitle_content->use_subtitles () || (!_always_burn_subtitles && (burnt != subtitle_content->burn_subtitles ()))) {
 636                         continue;
 637                 }
 638
 639                 shared_ptr<DCPContent> dcp_content = dynamic_pointer_cast<DCPContent> (subtitle_content);
 640                 if (dcp_content && dcp_content->reference_subtitle () && !_play_referenced) {
 641                         continue;
 642                 }
 643
 644                 shared_ptr<SubtitleDecoder> subtitle_decoder = dynamic_pointer_cast<SubtitleDecoder> ((*j)->decoder);
 645                 ContentTime const from = dcp_to_content_subtitle (*j, time);
 646                 /* XXX: this video_frame_rate() should be the rate that the subtitle content has been prepared for */
 647                 ContentTime const to = from + ContentTime::from_frames (1, _film->video_frame_rate ());
 648
 649                 list<ContentImageSubtitle> image = subtitle_decoder->get_image_subtitles (ContentTimePeriod (from, to), starting, accurate);
 650                 for (list<ContentImageSubtitle>::iterator i = image.begin(); i != image.end(); ++i) {
 651
 652                         /* Apply content's subtitle offsets */
 653                         i->sub.rectangle.x += subtitle_content->subtitle_x_offset ();
 654                         i->sub.rectangle.y += subtitle_content->subtitle_y_offset ();
 655
 656                         /* Apply content's subtitle scale */
 657                         i->sub.rectangle.width *= subtitle_content->subtitle_x_scale ();
 658                         i->sub.rectangle.height *= subtitle_content->subtitle_y_scale ();
 659
 660                         /* Apply a corrective translation to keep the subtitle centred after that scale */
 661                         i->sub.rectangle.x -= i->sub.rectangle.width * (subtitle_content->subtitle_x_scale() - 1);
 662                         i->sub.rectangle.y -= i->sub.rectangle.height * (subtitle_content->subtitle_y_scale() - 1);
 663
 664                         ps.image.push_back (i->sub);
 665                 }
 666
 667                 list<ContentTextSubtitle> text = subtitle_decoder->get_text_subtitles (ContentTimePeriod (from, to), starting, accurate);
 668                 BOOST_FOREACH (ContentTextSubtitle& ts, text) {
 669                         BOOST_FOREACH (dcp::SubtitleString s, ts.subs) {
 670                                 s.set_h_position (s.h_position() + subtitle_content->subtitle_x_offset ());
 671                                 s.set_v_position (s.v_position() + subtitle_content->subtitle_y_offset ());
 672                                 float const xs = subtitle_content->subtitle_x_scale();
 673                                 float const ys = subtitle_content->subtitle_y_scale();
 674                                 float const average = s.size() * (xs + ys) / 2;
 675                                 s.set_size (average);
 676                                 if (fabs (1.0 - xs / ys) > dcp::ASPECT_ADJUST_EPSILON) {
 677                                         s.set_aspect_adjust (xs / ys);
 678                                 }
 679                                 s.set_in (dcp::Time(content_subtitle_to_dcp (*j, ts.period().from).seconds(), 1000));
 680                                 s.set_out (dcp::Time(content_subtitle_to_dcp (*j, ts.period().to).seconds(), 1000));
 681                                 ps.text.push_back (s);
 682                                 ps.add_fonts (subtitle_content->fonts ());
 683                         }
 684                 }
 685         }
 686
 687         return ps;
 688 }
 689
 690 list<shared_ptr<Font> >
 691 Player::get_subtitle_fonts ()
 692 {
 693         if (!_have_valid_pieces) {
 694                 setup_pieces ();
 695         }
 696
 697         list<shared_ptr<Font> > fonts;
 698         BOOST_FOREACH (shared_ptr<Piece>& p, _pieces) {
 699                 shared_ptr<SubtitleContent> sc = dynamic_pointer_cast<SubtitleContent> (p->content);
 700                 if (sc) {
 701                         /* XXX: things may go wrong if there are duplicate font IDs
 702                            with different font files.
 703                         */
 704                         list<shared_ptr<Font> > f = sc->fonts ();
 705                         copy (f.begin(), f.end(), back_inserter (fonts));
 706                 }
 707         }
 708
 709         return fonts;
 710 }
 711
 712 /** Set this player never to produce any video data */
 713 void
 714 Player::set_ignore_video ()
 715 {
 716         _ignore_video = true;
 717 }
 718
 719 /** Set this player never to produce any audio data */
 720 void
 721 Player::set_ignore_audio ()
 722 {
 723         _ignore_audio = true;
 724 }
 725
 726 /** Set whether or not this player should always burn text subtitles into the image,
 727  *  regardless of the content settings.
 728  *  @param burn true to always burn subtitles, false to obey content settings.
 729  */
 730 void
 731 Player::set_always_burn_subtitles (bool burn)
 732 {
 733         _always_burn_subtitles = burn;
 734 }
 735
 736 void
 737 Player::set_fast ()
 738 {
 739         _fast = true;
 740         _have_valid_pieces = false;
 741 }
 742
 743 void
 744 Player::set_play_referenced ()
 745 {
 746         _play_referenced = true;
 747         _have_valid_pieces = false;
 748 }
 749
 750 list<ReferencedReelAsset>
 751 Player::get_reel_assets ()
 752 {
 753         list<ReferencedReelAsset> a;
 754
 755         BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
 756                 shared_ptr<DCPContent> j = dynamic_pointer_cast<DCPContent> (i);
 757                 if (!j) {
 758                         continue;
 759                 }
 760
 761                 scoped_ptr<DCPDecoder> decoder;
 762                 try {
 763                         decoder.reset (new DCPDecoder (j, false));
 764                 } catch (...) {
 765                         return a;
 766                 }
 767
 768                 int64_t offset = 0;
 769                 BOOST_FOREACH (shared_ptr<dcp::Reel> k, decoder->reels()) {
 770                         DCPTime const from = i->position() + DCPTime::from_frames (offset, _film->video_frame_rate());
 771                         if (j->reference_video ()) {
 772                                 a.push_back (
 773                                         ReferencedReelAsset (
 774                                                 k->main_picture (),
 775                                                 DCPTimePeriod (from, from + DCPTime::from_frames (k->main_picture()->duration(), _film->video_frame_rate()))
 776                                                 )
 777                                         );
 778                         }
 779
 780                         if (j->reference_audio ()) {
 781                                 a.push_back (
 782                                         ReferencedReelAsset (
 783                                                 k->main_sound (),
 784                                                 DCPTimePeriod (from, from + DCPTime::from_frames (k->main_sound()->duration(), _film->video_frame_rate()))
 785                                                 )
 786                                         );
 787                         }
 788
 789                         if (j->reference_subtitle ()) {
 790                                 DCPOMATIC_ASSERT (k->main_subtitle ());
 791                                 a.push_back (
 792                                         ReferencedReelAsset (
 793                                                 k->main_subtitle (),
 794                                                 DCPTimePeriod (from, from + DCPTime::from_frames (k->main_subtitle()->duration(), _film->video_frame_rate()))
 795                                                 )
 796                                         );
 797                         }
 798
 799                         /* Assume that main picture duration is the length of the reel */
 800                         offset += k->main_picture()->duration ();
 801                 }
 802         }
 803
 804         return a;
 805 }