src/lib/player.cc

   1 /*
   2     Copyright (C) 2013-2017 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "player.h"
  22 #include "film.h"
  23 #include "audio_buffers.h"
  24 #include "content_audio.h"
  25 #include "dcp_content.h"
  26 #include "job.h"
  27 #include "image.h"
  28 #include "raw_image_proxy.h"
  29 #include "ratio.h"
  30 #include "log.h"
  31 #include "render_subtitles.h"
  32 #include "config.h"
  33 #include "content_video.h"
  34 #include "player_video.h"
  35 #include "frame_rate_change.h"
  36 #include "audio_processor.h"
  37 #include "playlist.h"
  38 #include "referenced_reel_asset.h"
  39 #include "decoder_factory.h"
  40 #include "decoder.h"
  41 #include "video_decoder.h"
  42 #include "audio_decoder.h"
  43 #include "subtitle_content.h"
  44 #include "subtitle_decoder.h"
  45 #include "ffmpeg_content.h"
  46 #include "audio_content.h"
  47 #include "content_subtitle.h"
  48 #include "dcp_decoder.h"
  49 #include "image_decoder.h"
  50 #include "resampler.h"
  51 #include "compose.hpp"
  52 #include <dcp/reel.h>
  53 #include <dcp/reel_sound_asset.h>
  54 #include <dcp/reel_subtitle_asset.h>
  55 #include <dcp/reel_picture_asset.h>
  56 #include <boost/foreach.hpp>
  57 #include <stdint.h>
  58 #include <algorithm>
  59 #include <iostream>
  60
  61 #include "i18n.h"
  62
  63 #define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), LogEntry::TYPE_GENERAL);
  64
  65 using std::list;
  66 using std::cout;
  67 using std::min;
  68 using std::max;
  69 using std::min;
  70 using std::vector;
  71 using std::pair;
  72 using std::map;
  73 using std::make_pair;
  74 using std::copy;
  75 using boost::shared_ptr;
  76 using boost::weak_ptr;
  77 using boost::dynamic_pointer_cast;
  78 using boost::optional;
  79 using boost::scoped_ptr;
  80
  81 Player::Player (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
  82         : _film (film)
  83         , _playlist (playlist)
  84         , _have_valid_pieces (false)
  85         , _ignore_video (false)
  86         , _ignore_audio (false)
  87         , _always_burn_subtitles (false)
  88         , _fast (false)
  89         , _play_referenced (false)
  90         , _audio_merger (_film->audio_frame_rate())
  91 {
  92         _film_changed_connection = _film->Changed.connect (bind (&Player::film_changed, this, _1));
  93         _playlist_changed_connection = _playlist->Changed.connect (bind (&Player::playlist_changed, this));
  94         _playlist_content_changed_connection = _playlist->ContentChanged.connect (bind (&Player::playlist_content_changed, this, _1, _2, _3));
  95         set_video_container_size (_film->frame_size ());
  96
  97         film_changed (Film::AUDIO_PROCESSOR);
  98
  99         seek (DCPTime (), true);
 100 }
 101
 102 void
 103 Player::setup_pieces ()
 104 {
 105         _pieces.clear ();
 106
 107         BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
 108
 109                 if (!i->paths_valid ()) {
 110                         continue;
 111                 }
 112
 113                 shared_ptr<Decoder> decoder = decoder_factory (i, _film->log());
 114                 FrameRateChange frc (i->active_video_frame_rate(), _film->video_frame_rate());
 115
 116                 if (!decoder) {
 117                         /* Not something that we can decode; e.g. Atmos content */
 118                         continue;
 119                 }
 120
 121                 if (decoder->video && _ignore_video) {
 122                         decoder->video->set_ignore ();
 123                 }
 124
 125                 if (decoder->audio && _ignore_audio) {
 126                         decoder->audio->set_ignore ();
 127                 }
 128
 129                 shared_ptr<DCPDecoder> dcp = dynamic_pointer_cast<DCPDecoder> (decoder);
 130                 if (dcp && _play_referenced) {
 131                         dcp->set_decode_referenced ();
 132                 }
 133
 134                 shared_ptr<Piece> piece (new Piece (i, decoder, frc));
 135                 _pieces.push_back (piece);
 136
 137                 if (decoder->video) {
 138                         decoder->video->Data.connect (bind (&Player::video, this, weak_ptr<Piece> (piece), _1));
 139                 }
 140
 141                 if (decoder->audio) {
 142                         decoder->audio->Data.connect (bind (&Player::audio, this, weak_ptr<Piece> (piece), _1, _2));
 143                 }
 144
 145                 if (decoder->subtitle) {
 146                         decoder->subtitle->ImageStart.connect (bind (&Player::image_subtitle_start, this, weak_ptr<Piece> (piece), _1));
 147                         decoder->subtitle->TextStart.connect (bind (&Player::text_subtitle_start, this, weak_ptr<Piece> (piece), _1));
 148                         decoder->subtitle->Stop.connect (bind (&Player::subtitle_stop, this, weak_ptr<Piece> (piece), _1));
 149                 }
 150         }
 151
 152         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 153                 if (i->content->audio) {
 154                         BOOST_FOREACH (AudioStreamPtr j, i->content->audio->streams()) {
 155                                 _stream_states[j] = StreamState (i, i->content->position ());
 156                         }
 157                 }
 158         }
 159
 160         if (!_play_referenced) {
 161                 BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 162                         shared_ptr<DCPContent> dc = dynamic_pointer_cast<DCPContent> (i->content);
 163                         if (dc) {
 164                                 if (dc->reference_video()) {
 165                                         _no_video.push_back (DCPTimePeriod (dc->position(), dc->end()));
 166                                 }
 167                                 if (dc->reference_audio()) {
 168                                         _no_audio.push_back (DCPTimePeriod (dc->position(), dc->end()));
 169                                 }
 170                         }
 171                 }
 172         }
 173
 174         _last_video_time = DCPTime ();
 175         _last_audio_time = DCPTime ();
 176         _have_valid_pieces = true;
 177 }
 178
 179 void
 180 Player::playlist_content_changed (weak_ptr<Content> w, int property, bool frequent)
 181 {
 182         shared_ptr<Content> c = w.lock ();
 183         if (!c) {
 184                 return;
 185         }
 186
 187         if (
 188                 property == ContentProperty::POSITION ||
 189                 property == ContentProperty::LENGTH ||
 190                 property == ContentProperty::TRIM_START ||
 191                 property == ContentProperty::TRIM_END ||
 192                 property == ContentProperty::PATH ||
 193                 property == VideoContentProperty::FRAME_TYPE ||
 194                 property == DCPContentProperty::NEEDS_ASSETS ||
 195                 property == DCPContentProperty::NEEDS_KDM ||
 196                 property == SubtitleContentProperty::COLOUR ||
 197                 property == SubtitleContentProperty::OUTLINE ||
 198                 property == SubtitleContentProperty::SHADOW ||
 199                 property == SubtitleContentProperty::EFFECT_COLOUR ||
 200                 property == FFmpegContentProperty::SUBTITLE_STREAM ||
 201                 property == VideoContentProperty::COLOUR_CONVERSION
 202                 ) {
 203
 204                 _have_valid_pieces = false;
 205                 Changed (frequent);
 206
 207         } else if (
 208                 property == SubtitleContentProperty::LINE_SPACING ||
 209                 property == SubtitleContentProperty::OUTLINE_WIDTH ||
 210                 property == SubtitleContentProperty::Y_SCALE ||
 211                 property == SubtitleContentProperty::FADE_IN ||
 212                 property == SubtitleContentProperty::FADE_OUT ||
 213                 property == ContentProperty::VIDEO_FRAME_RATE ||
 214                 property == SubtitleContentProperty::USE ||
 215                 property == SubtitleContentProperty::X_OFFSET ||
 216                 property == SubtitleContentProperty::Y_OFFSET ||
 217                 property == SubtitleContentProperty::X_SCALE ||
 218                 property == SubtitleContentProperty::FONTS ||
 219                 property == VideoContentProperty::CROP ||
 220                 property == VideoContentProperty::SCALE ||
 221                 property == VideoContentProperty::FADE_IN ||
 222                 property == VideoContentProperty::FADE_OUT
 223                 ) {
 224
 225                 Changed (frequent);
 226         }
 227 }
 228
 229 void
 230 Player::set_video_container_size (dcp::Size s)
 231 {
 232         if (s == _video_container_size) {
 233                 return;
 234         }
 235
 236         _video_container_size = s;
 237
 238         _black_image.reset (new Image (AV_PIX_FMT_RGB24, _video_container_size, true));
 239         _black_image->make_black ();
 240
 241         Changed (false);
 242 }
 243
 244 void
 245 Player::playlist_changed ()
 246 {
 247         _have_valid_pieces = false;
 248         Changed (false);
 249 }
 250
 251 void
 252 Player::film_changed (Film::Property p)
 253 {
 254         /* Here we should notice Film properties that affect our output, and
 255            alert listeners that our output now would be different to how it was
 256            last time we were run.
 257         */
 258
 259         if (p == Film::CONTAINER) {
 260                 Changed (false);
 261         } else if (p == Film::VIDEO_FRAME_RATE) {
 262                 /* Pieces contain a FrameRateChange which contains the DCP frame rate,
 263                    so we need new pieces here.
 264                 */
 265                 _have_valid_pieces = false;
 266                 Changed (false);
 267         } else if (p == Film::AUDIO_PROCESSOR) {
 268                 if (_film->audio_processor ()) {
 269                         _audio_processor = _film->audio_processor()->clone (_film->audio_frame_rate ());
 270                 }
 271         }
 272 }
 273
 274 list<PositionImage>
 275 Player::transform_image_subtitles (list<ImageSubtitle> subs) const
 276 {
 277         list<PositionImage> all;
 278
 279         for (list<ImageSubtitle>::const_iterator i = subs.begin(); i != subs.end(); ++i) {
 280                 if (!i->image) {
 281                         continue;
 282                 }
 283
 284                 /* We will scale the subtitle up to fit _video_container_size */
 285                 dcp::Size scaled_size (i->rectangle.width * _video_container_size.width, i->rectangle.height * _video_container_size.height);
 286
 287                 /* Then we need a corrective translation, consisting of two parts:
 288                  *
 289                  * 1.  that which is the result of the scaling of the subtitle by _video_container_size; this will be
 290                  *     rect.x * _video_container_size.width and rect.y * _video_container_size.height.
 291                  *
 292                  * 2.  that to shift the origin of the scale by subtitle_scale to the centre of the subtitle; this will be
 293                  *     (width_before_subtitle_scale * (1 - subtitle_x_scale) / 2) and
 294                  *     (height_before_subtitle_scale * (1 - subtitle_y_scale) / 2).
 295                  *
 296                  * Combining these two translations gives these expressions.
 297                  */
 298
 299                 all.push_back (
 300                         PositionImage (
 301                                 i->image->scale (
 302                                         scaled_size,
 303                                         dcp::YUV_TO_RGB_REC601,
 304                                         i->image->pixel_format (),
 305                                         true,
 306                                         _fast
 307                                         ),
 308                                 Position<int> (
 309                                         lrint (_video_container_size.width * i->rectangle.x),
 310                                         lrint (_video_container_size.height * i->rectangle.y)
 311                                         )
 312                                 )
 313                         );
 314         }
 315
 316         return all;
 317 }
 318
 319 shared_ptr<PlayerVideo>
 320 Player::black_player_video_frame () const
 321 {
 322         return shared_ptr<PlayerVideo> (
 323                 new PlayerVideo (
 324                         shared_ptr<const ImageProxy> (new RawImageProxy (_black_image)),
 325                         Crop (),
 326                         optional<double> (),
 327                         _video_container_size,
 328                         _video_container_size,
 329                         EYES_BOTH,
 330                         PART_WHOLE,
 331                         PresetColourConversion::all().front().conversion
 332                 )
 333         );
 334 }
 335
 336 Frame
 337 Player::dcp_to_content_video (shared_ptr<const Piece> piece, DCPTime t) const
 338 {
 339         DCPTime s = t - piece->content->position ();
 340         s = min (piece->content->length_after_trim(), s);
 341         s = max (DCPTime(), s + DCPTime (piece->content->trim_start(), piece->frc));
 342
 343         /* It might seem more logical here to convert s to a ContentTime (using the FrameRateChange)
 344            then convert that ContentTime to frames at the content's rate.  However this fails for
 345            situations like content at 29.9978733fps, DCP at 30fps.  The accuracy of the Time type is not
 346            enough to distinguish between the two with low values of time (e.g. 3200 in Time units).
 347
 348            Instead we convert the DCPTime using the DCP video rate then account for any skip/repeat.
 349         */
 350         return s.frames_floor (piece->frc.dcp) / piece->frc.factor ();
 351 }
 352
 353 DCPTime
 354 Player::content_video_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 355 {
 356         /* See comment in dcp_to_content_video */
 357         DCPTime const d = DCPTime::from_frames (f * piece->frc.factor(), piece->frc.dcp) - DCPTime (piece->content->trim_start (), piece->frc);
 358         return max (DCPTime (), d + piece->content->position ());
 359 }
 360
 361 Frame
 362 Player::dcp_to_resampled_audio (shared_ptr<const Piece> piece, DCPTime t) const
 363 {
 364         DCPTime s = t - piece->content->position ();
 365         s = min (piece->content->length_after_trim(), s);
 366         /* See notes in dcp_to_content_video */
 367         return max (DCPTime (), DCPTime (piece->content->trim_start (), piece->frc) + s).frames_floor (_film->audio_frame_rate ());
 368 }
 369
 370 DCPTime
 371 Player::resampled_audio_to_dcp (shared_ptr<const Piece> piece, Frame f) const
 372 {
 373         /* See comment in dcp_to_content_video */
 374         DCPTime const d = DCPTime::from_frames (f, _film->audio_frame_rate()) - DCPTime (piece->content->trim_start(), piece->frc);
 375         return max (DCPTime (), d + piece->content->position ());
 376 }
 377
 378 ContentTime
 379 Player::dcp_to_content_time (shared_ptr<const Piece> piece, DCPTime t) const
 380 {
 381         DCPTime s = t - piece->content->position ();
 382         s = min (piece->content->length_after_trim(), s);
 383         return max (ContentTime (), ContentTime (s, piece->frc) + piece->content->trim_start());
 384 }
 385
 386 DCPTime
 387 Player::content_time_to_dcp (shared_ptr<const Piece> piece, ContentTime t) const
 388 {
 389         return max (DCPTime (), DCPTime (t - piece->content->trim_start(), piece->frc) + piece->content->position());
 390 }
 391
 392 list<shared_ptr<Font> >
 393 Player::get_subtitle_fonts ()
 394 {
 395         if (!_have_valid_pieces) {
 396                 setup_pieces ();
 397         }
 398
 399         list<shared_ptr<Font> > fonts;
 400         BOOST_FOREACH (shared_ptr<Piece>& p, _pieces) {
 401                 if (p->content->subtitle) {
 402                         /* XXX: things may go wrong if there are duplicate font IDs
 403                            with different font files.
 404                         */
 405                         list<shared_ptr<Font> > f = p->content->subtitle->fonts ();
 406                         copy (f.begin(), f.end(), back_inserter (fonts));
 407                 }
 408         }
 409
 410         return fonts;
 411 }
 412
 413 /** Set this player never to produce any video data */
 414 void
 415 Player::set_ignore_video ()
 416 {
 417         _ignore_video = true;
 418 }
 419
 420 /** Set whether or not this player should always burn text subtitles into the image,
 421  *  regardless of the content settings.
 422  *  @param burn true to always burn subtitles, false to obey content settings.
 423  */
 424 void
 425 Player::set_always_burn_subtitles (bool burn)
 426 {
 427         _always_burn_subtitles = burn;
 428 }
 429
 430 void
 431 Player::set_fast ()
 432 {
 433         _fast = true;
 434         _have_valid_pieces = false;
 435 }
 436
 437 void
 438 Player::set_play_referenced ()
 439 {
 440         _play_referenced = true;
 441         _have_valid_pieces = false;
 442 }
 443
 444 list<ReferencedReelAsset>
 445 Player::get_reel_assets ()
 446 {
 447         list<ReferencedReelAsset> a;
 448
 449         BOOST_FOREACH (shared_ptr<Content> i, _playlist->content ()) {
 450                 shared_ptr<DCPContent> j = dynamic_pointer_cast<DCPContent> (i);
 451                 if (!j) {
 452                         continue;
 453                 }
 454
 455                 scoped_ptr<DCPDecoder> decoder;
 456                 try {
 457                         decoder.reset (new DCPDecoder (j, _film->log()));
 458                 } catch (...) {
 459                         return a;
 460                 }
 461
 462                 int64_t offset = 0;
 463                 BOOST_FOREACH (shared_ptr<dcp::Reel> k, decoder->reels()) {
 464
 465                         DCPOMATIC_ASSERT (j->video_frame_rate ());
 466                         double const cfr = j->video_frame_rate().get();
 467                         Frame const trim_start = j->trim_start().frames_round (cfr);
 468                         Frame const trim_end = j->trim_end().frames_round (cfr);
 469                         int const ffr = _film->video_frame_rate ();
 470
 471                         DCPTime const from = i->position() + DCPTime::from_frames (offset, _film->video_frame_rate());
 472                         if (j->reference_video ()) {
 473                                 shared_ptr<dcp::ReelAsset> ra = k->main_picture ();
 474                                 DCPOMATIC_ASSERT (ra);
 475                                 ra->set_entry_point (ra->entry_point() + trim_start);
 476                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 477                                 a.push_back (
 478                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 479                                         );
 480                         }
 481
 482                         if (j->reference_audio ()) {
 483                                 shared_ptr<dcp::ReelAsset> ra = k->main_sound ();
 484                                 DCPOMATIC_ASSERT (ra);
 485                                 ra->set_entry_point (ra->entry_point() + trim_start);
 486                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 487                                 a.push_back (
 488                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 489                                         );
 490                         }
 491
 492                         if (j->reference_subtitle ()) {
 493                                 shared_ptr<dcp::ReelAsset> ra = k->main_subtitle ();
 494                                 DCPOMATIC_ASSERT (ra);
 495                                 ra->set_entry_point (ra->entry_point() + trim_start);
 496                                 ra->set_duration (ra->duration() - trim_start - trim_end);
 497                                 a.push_back (
 498                                         ReferencedReelAsset (ra, DCPTimePeriod (from, from + DCPTime::from_frames (ra->duration(), ffr)))
 499                                         );
 500                         }
 501
 502                         /* Assume that main picture duration is the length of the reel */
 503                         offset += k->main_picture()->duration ();
 504                 }
 505         }
 506
 507         return a;
 508 }
 509
 510 bool
 511 Player::pass ()
 512 {
 513         if (!_have_valid_pieces) {
 514                 setup_pieces ();
 515         }
 516
 517         shared_ptr<Piece> earliest;
 518         DCPTime earliest_content;
 519
 520         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 521                 if (!i->done) {
 522                         DCPTime const t = i->content->position() + DCPTime (i->decoder->position(), i->frc);
 523                         if (!earliest || t < earliest_content) {
 524                                 earliest_content = t;
 525                                 earliest = i;
 526                         }
 527                 }
 528         }
 529
 530         /* Fill towards the next thing that might happen (or the end of the playlist).  This is to fill gaps between content,
 531            NOT to fill gaps within content (the latter is done in ::video())
 532         */
 533         DCPTime fill_towards = earliest ? earliest_content : _playlist->length().ceil(_film->video_frame_rate());
 534
 535         /* Work out where to fill video from */
 536         optional<DCPTime> video_fill_from;
 537         if (_last_video_time) {
 538                 /* Fill from the last video or seek time */
 539                 video_fill_from = _last_video_time;
 540         }
 541
 542         bool filled = false;
 543         /* Fill some black if we would emit before the earliest piece of content.  This is so we act like a phantom
 544            Piece which emits black in spaces (we only emit if we are the earliest thing)
 545         */
 546         if (video_fill_from && (!earliest || *video_fill_from < earliest_content) && ((fill_towards - *video_fill_from)) >= one_video_frame()) {
 547                 list<DCPTimePeriod> p = subtract(DCPTimePeriod(*video_fill_from, *video_fill_from + one_video_frame()), _no_video);
 548                 if (!p.empty ()) {
 549                         emit_video (black_player_video_frame(), p.front().from);
 550                         filled = true;
 551                 }
 552         } else if (_playlist->length() == DCPTime()) {
 553                 /* Special case of an empty Film; just give one black frame */
 554                 emit_video (black_player_video_frame(), DCPTime());
 555                 filled = true;
 556         }
 557
 558         optional<DCPTime> audio_fill_from;
 559         if (_last_audio_time) {
 560                 /* Fill from the last audio or seek time */
 561                 audio_fill_from = _last_audio_time;
 562         }
 563
 564         if (audio_fill_from && audio_fill_from < fill_towards) {
 565                 DCPTimePeriod period (*audio_fill_from, fill_towards);
 566                 if (period.duration() > one_video_frame()) {
 567                         period.to = period.from + one_video_frame();
 568                 }
 569                 list<DCPTimePeriod> p = subtract(period, _no_audio);
 570                 if (!p.empty ()) {
 571                         fill_audio (p.front());
 572                 }
 573                 filled = true;
 574         }
 575
 576         if (earliest) {
 577                 earliest->done = earliest->decoder->pass ();
 578                 if (earliest->done && earliest->content->audio) {
 579                         /* Flush the Player audio system for this piece */
 580                         BOOST_FOREACH (AudioStreamPtr i, earliest->content->audio->streams()) {
 581                                 audio_flush (earliest, i);
 582                         }
 583                 }
 584         }
 585
 586         /* Emit any audio that is ready */
 587
 588         DCPTime pull_to = _playlist->length ();
 589         for (map<AudioStreamPtr, StreamState>::const_iterator i = _stream_states.begin(); i != _stream_states.end(); ++i) {
 590                 if (!i->second.piece->done && i->second.last_push_end < pull_to) {
 591                         pull_to = i->second.last_push_end;
 592                 }
 593         }
 594
 595         list<pair<shared_ptr<AudioBuffers>, DCPTime> > audio = _audio_merger.pull (pull_to);
 596         for (list<pair<shared_ptr<AudioBuffers>, DCPTime> >::iterator i = audio.begin(); i != audio.end(); ++i) {
 597                 if (_last_audio_time && i->second < *_last_audio_time) {
 598                         /* There has been an accurate seek and we have received some audio before the seek time;
 599                            discard it.
 600                         */
 601                         pair<shared_ptr<AudioBuffers>, DCPTime> cut = discard_audio (i->first, i->second, *_last_audio_time);
 602                         if (!cut.first) {
 603                                 continue;
 604                         }
 605                         *i = cut;
 606                 }
 607
 608                 if (_last_audio_time) {
 609                         fill_audio (DCPTimePeriod (*_last_audio_time, i->second));
 610                 }
 611
 612                 emit_audio (i->first, i->second);
 613         }
 614
 615         return !earliest && !filled;
 616 }
 617
 618 optional<PositionImage>
 619 Player::subtitles_for_frame (DCPTime time) const
 620 {
 621         list<PositionImage> subtitles;
 622
 623         BOOST_FOREACH (PlayerSubtitles i, _active_subtitles.get_burnt (time, _always_burn_subtitles)) {
 624
 625                 /* Image subtitles */
 626                 list<PositionImage> c = transform_image_subtitles (i.image);
 627                 copy (c.begin(), c.end(), back_inserter (subtitles));
 628
 629                 /* Text subtitles (rendered to an image) */
 630                 if (!i.text.empty ()) {
 631                         list<PositionImage> s = render_subtitles (i.text, i.fonts, _video_container_size, time);
 632                         copy (s.begin(), s.end(), back_inserter (subtitles));
 633                 }
 634         }
 635
 636         if (subtitles.empty ()) {
 637                 return optional<PositionImage> ();
 638         }
 639
 640         return merge (subtitles);
 641 }
 642
 643 void
 644 Player::video (weak_ptr<Piece> wp, ContentVideo video)
 645 {
 646         shared_ptr<Piece> piece = wp.lock ();
 647         if (!piece) {
 648                 return;
 649         }
 650
 651         FrameRateChange frc(piece->content->active_video_frame_rate(), _film->video_frame_rate());
 652         if (frc.skip && (video.frame % 2) == 1) {
 653                 return;
 654         }
 655
 656         /* Time and period of the frame we will emit */
 657         DCPTime const time = content_video_to_dcp (piece, video.frame);
 658         DCPTimePeriod const period (time, time + one_video_frame());
 659
 660         /* Discard if it's outside the content's period or if it's before the last accurate seek */
 661         if (
 662                 time < piece->content->position() ||
 663                 time >= piece->content->end() ||
 664                 (_last_video_time && time < *_last_video_time)) {
 665                 return;
 666         }
 667
 668         /* Fill gaps that we discover now that we have some video which needs to be emitted */
 669
 670         optional<DCPTime> fill_to;
 671         if (_last_video_time) {
 672                 fill_to = _last_video_time;
 673         }
 674
 675         if (fill_to) {
 676                 /* XXX: this may not work for 3D */
 677                 BOOST_FOREACH (DCPTimePeriod i, subtract(DCPTimePeriod (*fill_to, time), _no_video)) {
 678                         for (DCPTime j = i.from; j < i.to; j += one_video_frame()) {
 679                                 LastVideoMap::const_iterator k = _last_video.find (wp);
 680                                 if (k != _last_video.end ()) {
 681                                         emit_video (k->second, j);
 682                                 } else {
 683                                         emit_video (black_player_video_frame(), j);
 684                                 }
 685                         }
 686                 }
 687         }
 688
 689         _last_video[wp].reset (
 690                 new PlayerVideo (
 691                         video.image,
 692                         piece->content->video->crop (),
 693                         piece->content->video->fade (video.frame),
 694                         piece->content->video->scale().size (
 695                                 piece->content->video, _video_container_size, _film->frame_size ()
 696                                 ),
 697                         _video_container_size,
 698                         video.eyes,
 699                         video.part,
 700                         piece->content->video->colour_conversion ()
 701                         )
 702                 );
 703
 704         emit_video (_last_video[wp], time);
 705 }
 706
 707 void
 708 Player::audio_flush (shared_ptr<Piece> piece, AudioStreamPtr stream)
 709 {
 710         shared_ptr<AudioContent> content = piece->content->audio;
 711         DCPOMATIC_ASSERT (content);
 712
 713         shared_ptr<Resampler> r = resampler (content, stream, false);
 714         if (!r) {
 715                 return;
 716         }
 717
 718         pair<shared_ptr<const AudioBuffers>, Frame> ro = r->flush ();
 719         if (ro.first->frames() == 0) {
 720                 return;
 721         }
 722
 723         ContentAudio content_audio;
 724         content_audio.audio = ro.first;
 725         content_audio.frame = ro.second;
 726
 727         /* Compute time in the DCP */
 728         DCPTime time = resampled_audio_to_dcp (piece, content_audio.frame) + DCPTime::from_seconds (content->delay() / 1000.0);
 729
 730         audio_transform (content, stream, content_audio, time);
 731 }
 732
 733 /** Do our common processing on some audio */
 734 void
 735 Player::audio_transform (shared_ptr<AudioContent> content, AudioStreamPtr stream, ContentAudio content_audio, DCPTime time)
 736 {
 737         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
 738
 739         /* Gain */
 740
 741         if (content->gain() != 0) {
 742                 shared_ptr<AudioBuffers> gain (new AudioBuffers (content_audio.audio));
 743                 gain->apply_gain (content->gain ());
 744                 content_audio.audio = gain;
 745         }
 746
 747         /* Remap */
 748
 749         shared_ptr<AudioBuffers> dcp_mapped (new AudioBuffers (_film->audio_channels(), content_audio.audio->frames()));
 750         dcp_mapped->make_silent ();
 751
 752         AudioMapping map = stream->mapping ();
 753         for (int i = 0; i < map.input_channels(); ++i) {
 754                 for (int j = 0; j < dcp_mapped->channels(); ++j) {
 755                         if (map.get (i, static_cast<dcp::Channel> (j)) > 0) {
 756                                 dcp_mapped->accumulate_channel (
 757                                         content_audio.audio.get(),
 758                                         i,
 759                                         static_cast<dcp::Channel> (j),
 760                                         map.get (i, static_cast<dcp::Channel> (j))
 761                                         );
 762                         }
 763                 }
 764         }
 765
 766         content_audio.audio = dcp_mapped;
 767
 768         /* Process */
 769
 770         if (_audio_processor) {
 771                 content_audio.audio = _audio_processor->run (content_audio.audio, _film->audio_channels ());
 772         }
 773
 774         /* Pad any gap which may be caused by audio delay */
 775
 776         if (_last_audio_time) {
 777                 fill_audio (DCPTimePeriod (*_last_audio_time, time));
 778         }
 779
 780         /* Push */
 781
 782         _audio_merger.push (content_audio.audio, time);
 783         DCPOMATIC_ASSERT (_stream_states.find (stream) != _stream_states.end ());
 784         _stream_states[stream].last_push_end = time + DCPTime::from_frames (content_audio.audio->frames(), _film->audio_frame_rate());
 785 }
 786
 787 void
 788 Player::audio (weak_ptr<Piece> wp, AudioStreamPtr stream, ContentAudio content_audio)
 789 {
 790         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
 791
 792         shared_ptr<Piece> piece = wp.lock ();
 793         if (!piece) {
 794                 return;
 795         }
 796
 797         shared_ptr<AudioContent> content = piece->content->audio;
 798         DCPOMATIC_ASSERT (content);
 799
 800         /* Resample */
 801         if (stream->frame_rate() != content->resampled_frame_rate()) {
 802                 shared_ptr<Resampler> r = resampler (content, stream, true);
 803                 pair<shared_ptr<const AudioBuffers>, Frame> ro = r->run (content_audio.audio, content_audio.frame);
 804                 if (ro.first->frames() == 0) {
 805                         return;
 806                 }
 807                 content_audio.audio = ro.first;
 808                 content_audio.frame = ro.second;
 809         }
 810
 811         /* Compute time in the DCP */
 812         DCPTime time = resampled_audio_to_dcp (piece, content_audio.frame) + DCPTime::from_seconds (content->delay() / 1000.0);
 813         /* And the end of this block in the DCP */
 814         DCPTime end = time + DCPTime::from_frames(content_audio.audio->frames(), content->resampled_frame_rate());
 815
 816         /* Remove anything that comes before the start or after the end of the content */
 817         if (time < piece->content->position()) {
 818                 pair<shared_ptr<AudioBuffers>, DCPTime> cut = discard_audio (content_audio.audio, time, piece->content->position());
 819                 if (!cut.first) {
 820                         /* This audio is entirely discarded */
 821                         return;
 822                 }
 823                 content_audio.audio = cut.first;
 824                 time = cut.second;
 825         } else if (time > piece->content->end()) {
 826                 /* Discard it all */
 827                 return;
 828         } else if (end > piece->content->end()) {
 829                 Frame const remaining_frames = DCPTime(piece->content->end() - time).frames_round(_film->audio_frame_rate());
 830                 if (remaining_frames == 0) {
 831                         return;
 832                 }
 833                 shared_ptr<AudioBuffers> cut (new AudioBuffers (content_audio.audio->channels(), remaining_frames));
 834                 cut->copy_from (content_audio.audio.get(), remaining_frames, 0, 0);
 835                 content_audio.audio = cut;
 836         }
 837
 838         audio_transform (content, stream, content_audio, time);
 839 }
 840
 841 void
 842 Player::image_subtitle_start (weak_ptr<Piece> wp, ContentImageSubtitle subtitle)
 843 {
 844         shared_ptr<Piece> piece = wp.lock ();
 845         if (!piece) {
 846                 return;
 847         }
 848
 849         /* Apply content's subtitle offsets */
 850         subtitle.sub.rectangle.x += piece->content->subtitle->x_offset ();
 851         subtitle.sub.rectangle.y += piece->content->subtitle->y_offset ();
 852
 853         /* Apply content's subtitle scale */
 854         subtitle.sub.rectangle.width *= piece->content->subtitle->x_scale ();
 855         subtitle.sub.rectangle.height *= piece->content->subtitle->y_scale ();
 856
 857         /* Apply a corrective translation to keep the subtitle centred after that scale */
 858         subtitle.sub.rectangle.x -= subtitle.sub.rectangle.width * (piece->content->subtitle->x_scale() - 1);
 859         subtitle.sub.rectangle.y -= subtitle.sub.rectangle.height * (piece->content->subtitle->y_scale() - 1);
 860
 861         PlayerSubtitles ps;
 862         ps.image.push_back (subtitle.sub);
 863         DCPTime from (content_time_to_dcp (piece, subtitle.from()));
 864
 865         _active_subtitles.add_from (wp, ps, from);
 866 }
 867
 868 void
 869 Player::text_subtitle_start (weak_ptr<Piece> wp, ContentTextSubtitle subtitle)
 870 {
 871         shared_ptr<Piece> piece = wp.lock ();
 872         if (!piece) {
 873                 return;
 874         }
 875
 876         PlayerSubtitles ps;
 877         DCPTime const from (content_time_to_dcp (piece, subtitle.from()));
 878
 879         BOOST_FOREACH (dcp::SubtitleString s, subtitle.subs) {
 880                 s.set_h_position (s.h_position() + piece->content->subtitle->x_offset ());
 881                 s.set_v_position (s.v_position() + piece->content->subtitle->y_offset ());
 882                 float const xs = piece->content->subtitle->x_scale();
 883                 float const ys = piece->content->subtitle->y_scale();
 884                 float size = s.size();
 885
 886                 /* Adjust size to express the common part of the scaling;
 887                    e.g. if xs = ys = 0.5 we scale size by 2.
 888                 */
 889                 if (xs > 1e-5 && ys > 1e-5) {
 890                         size *= 1 / min (1 / xs, 1 / ys);
 891                 }
 892                 s.set_size (size);
 893
 894                 /* Then express aspect ratio changes */
 895                 if (fabs (1.0 - xs / ys) > dcp::ASPECT_ADJUST_EPSILON) {
 896                         s.set_aspect_adjust (xs / ys);
 897                 }
 898
 899                 s.set_in (dcp::Time(from.seconds(), 1000));
 900                 ps.text.push_back (SubtitleString (s, piece->content->subtitle->outline_width()));
 901                 ps.add_fonts (piece->content->subtitle->fonts ());
 902         }
 903
 904         _active_subtitles.add_from (wp, ps, from);
 905 }
 906
 907 void
 908 Player::subtitle_stop (weak_ptr<Piece> wp, ContentTime to)
 909 {
 910         if (!_active_subtitles.have (wp)) {
 911                 return;
 912         }
 913
 914         shared_ptr<Piece> piece = wp.lock ();
 915         if (!piece) {
 916                 return;
 917         }
 918
 919         DCPTime const dcp_to = content_time_to_dcp (piece, to);
 920
 921         pair<PlayerSubtitles, DCPTime> from = _active_subtitles.add_to (wp, dcp_to);
 922
 923         if (piece->content->subtitle->use() && !_always_burn_subtitles && !piece->content->subtitle->burn()) {
 924                 Subtitle (from.first, DCPTimePeriod (from.second, dcp_to));
 925         }
 926 }
 927
 928 void
 929 Player::seek (DCPTime time, bool accurate)
 930 {
 931         if (_audio_processor) {
 932                 _audio_processor->flush ();
 933         }
 934
 935         for (ResamplerMap::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
 936                 i->second->flush ();
 937                 i->second->reset ();
 938         }
 939
 940         _audio_merger.clear ();
 941         _active_subtitles.clear ();
 942
 943         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 944                 if (time < i->content->position()) {
 945                         /* Before; seek to 0 */
 946                         i->decoder->seek (ContentTime(), accurate);
 947                         i->done = false;
 948                 } else if (i->content->position() <= time && time < i->content->end()) {
 949                         /* During; seek to position */
 950                         i->decoder->seek (dcp_to_content_time (i, time), accurate);
 951                         i->done = false;
 952                 } else {
 953                         /* After; this piece is done */
 954                         i->done = true;
 955                 }
 956         }
 957
 958         if (accurate) {
 959                 _last_video_time = time;
 960                 _last_audio_time = time;
 961         } else {
 962                 _last_video_time = optional<DCPTime>();
 963                 _last_audio_time = optional<DCPTime>();
 964         }
 965 }
 966
 967 shared_ptr<Resampler>
 968 Player::resampler (shared_ptr<const AudioContent> content, AudioStreamPtr stream, bool create)
 969 {
 970         ResamplerMap::const_iterator i = _resamplers.find (make_pair (content, stream));
 971         if (i != _resamplers.end ()) {
 972                 return i->second;
 973         }
 974
 975         if (!create) {
 976                 return shared_ptr<Resampler> ();
 977         }
 978
 979         LOG_GENERAL (
 980                 "Creating new resampler from %1 to %2 with %3 channels",
 981                 stream->frame_rate(),
 982                 content->resampled_frame_rate(),
 983                 stream->channels()
 984                 );
 985
 986         shared_ptr<Resampler> r (
 987                 new Resampler (stream->frame_rate(), content->resampled_frame_rate(), stream->channels())
 988                 );
 989
 990         _resamplers[make_pair(content, stream)] = r;
 991         return r;
 992 }
 993
 994 void
 995 Player::emit_video (shared_ptr<PlayerVideo> pv, DCPTime time)
 996 {
 997         optional<PositionImage> subtitles = subtitles_for_frame (time);
 998         if (subtitles) {
 999                 pv->set_subtitle (subtitles.get ());
1000         }
1001
1002         Video (pv, time);
1003
1004         if (pv->eyes() == EYES_BOTH || pv->eyes() == EYES_RIGHT) {
1005                 _last_video_time = time + one_video_frame();
1006                 _active_subtitles.clear_before (time);
1007         }
1008 }
1009
1010 void
1011 Player::emit_audio (shared_ptr<AudioBuffers> data, DCPTime time)
1012 {
1013         Audio (data, time);
1014         _last_audio_time = time + DCPTime::from_frames (data->frames(), _film->audio_frame_rate ());
1015 }
1016
1017 void
1018 Player::fill_audio (DCPTimePeriod period)
1019 {
1020         if (period.from == period.to) {
1021                 return;
1022         }
1023
1024         BOOST_FOREACH (DCPTimePeriod i, subtract(period, _no_audio)) {
1025                 DCPTime t = i.from;
1026                 while (t < i.to) {
1027                         DCPTime block = min (DCPTime::from_seconds (0.5), i.to - t);
1028                         Frame const samples = block.frames_round(_film->audio_frame_rate());
1029                         if (samples) {
1030                                 shared_ptr<AudioBuffers> silence (new AudioBuffers (_film->audio_channels(), samples));
1031                                 silence->make_silent ();
1032                                 emit_audio (silence, t);
1033                         }
1034                         t += block;
1035                 }
1036         }
1037 }
1038
1039 DCPTime
1040 Player::one_video_frame () const
1041 {
1042         return DCPTime::from_frames (1, _film->video_frame_rate ());
1043 }
1044
1045 pair<shared_ptr<AudioBuffers>, DCPTime>
1046 Player::discard_audio (shared_ptr<const AudioBuffers> audio, DCPTime time, DCPTime discard_to) const
1047 {
1048         DCPTime const discard_time = discard_to - time;
1049         Frame const discard_frames = discard_time.frames_round(_film->audio_frame_rate());
1050         Frame remaining_frames = audio->frames() - discard_frames;
1051         if (remaining_frames <= 0) {
1052                 return make_pair(shared_ptr<AudioBuffers>(), DCPTime());
1053         }
1054         shared_ptr<AudioBuffers> cut (new AudioBuffers (audio->channels(), remaining_frames));
1055         cut->copy_from (audio.get(), remaining_frames, discard_frames, 0);
1056         return make_pair(cut, time + discard_time);
1057 }