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 = optional<DCPTime> ();
 175         _last_audio_time = optional<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         if (earliest) {
 531                 earliest->done = earliest->decoder->pass ();
 532                 if (earliest->done && earliest->content->audio) {
 533                         /* Flush the Player audio system for this piece */
 534                         BOOST_FOREACH (AudioStreamPtr i, earliest->content->audio->streams()) {
 535                                 audio_flush (earliest, i);
 536                         }
 537                 }
 538         }
 539
 540         if (_last_video_time) {
 541                 fill_video (DCPTimePeriod (_last_video_time.get(), earliest ? earliest_content : _playlist->length()));
 542         } else if (_last_seek_time) {
 543                 fill_video (DCPTimePeriod (_last_seek_time.get(), _last_seek_time.get() + one_video_frame ()));
 544         }
 545
 546         /* XXX: fill audio */
 547
 548         if (!earliest) {
 549                 return true;
 550         }
 551
 552         /* Emit any audio that is ready */
 553
 554         DCPTime pull_from = _playlist->length ();
 555         for (map<AudioStreamPtr, StreamState>::const_iterator i = _stream_states.begin(); i != _stream_states.end(); ++i) {
 556                 if (!i->second.piece->done && i->second.last_push_end < pull_from) {
 557                         pull_from = i->second.last_push_end;
 558                 }
 559         }
 560
 561         list<pair<shared_ptr<AudioBuffers>, DCPTime> > audio = _audio_merger.pull (pull_from);
 562         for (list<pair<shared_ptr<AudioBuffers>, DCPTime> >::iterator i = audio.begin(); i != audio.end(); ++i) {
 563                 if (_last_audio_time && i->second < _last_audio_time.get()) {
 564                         /* There has been an accurate seek and we have received some audio before the seek time;
 565                            discard it.
 566                         */
 567                         pair<shared_ptr<AudioBuffers>, DCPTime> cut = discard_audio (i->first, i->second, *_last_audio_time);
 568                         if (!cut.first) {
 569                                 continue;
 570                         }
 571                         *i = cut;
 572                 }
 573
 574                 if (_last_audio_time) {
 575                         /* XXX: does this remain necessary? */
 576                         fill_audio (DCPTimePeriod (_last_audio_time.get(), i->second));
 577                 }
 578
 579                 Audio (i->first, i->second);
 580                 _last_audio_time = i->second + DCPTime::from_frames(i->first->frames(), _film->audio_frame_rate());
 581         }
 582
 583         return false;
 584 }
 585
 586 optional<PositionImage>
 587 Player::subtitles_for_frame (DCPTime time) const
 588 {
 589         list<PositionImage> subtitles;
 590
 591         BOOST_FOREACH (PlayerSubtitles i, _active_subtitles.get(time, _always_burn_subtitles)) {
 592
 593                 /* Image subtitles */
 594                 list<PositionImage> c = transform_image_subtitles (i.image);
 595                 copy (c.begin(), c.end(), back_inserter (subtitles));
 596
 597                 /* Text subtitles (rendered to an image) */
 598                 if (!i.text.empty ()) {
 599                         list<PositionImage> s = render_subtitles (i.text, i.fonts, _video_container_size, time);
 600                         copy (s.begin(), s.end(), back_inserter (subtitles));
 601                 }
 602         }
 603
 604         if (subtitles.empty ()) {
 605                 return optional<PositionImage> ();
 606         }
 607
 608         return merge (subtitles);
 609 }
 610
 611 void
 612 Player::video (weak_ptr<Piece> wp, ContentVideo video)
 613 {
 614         shared_ptr<Piece> piece = wp.lock ();
 615         if (!piece) {
 616                 return;
 617         }
 618
 619         FrameRateChange frc(piece->content->active_video_frame_rate(), _film->video_frame_rate());
 620         if (frc.skip && (video.frame % 2) == 1) {
 621                 return;
 622         }
 623
 624         /* Time and period of the frame we will emit */
 625         DCPTime const time = content_video_to_dcp (piece, video.frame);
 626         DCPTimePeriod const period (time, time + one_video_frame());
 627
 628         /* Discard if it's outside the content's period or if it's before the last accurate seek */
 629         if (time < piece->content->position() || time >= piece->content->end() || (_last_video_time && time < _last_video_time)) {
 630                 return;
 631         }
 632
 633         /* Fill gaps caused by (the hopefully rare event of) a decoder not emitting contiguous video */
 634
 635         /* XXX: is this necessary? can it be done by the fill in pass? */
 636         if (_last_video_time) {
 637                 fill_video (DCPTimePeriod (_last_video_time.get(), time));
 638         }
 639
 640         _last_video.reset (
 641                 new PlayerVideo (
 642                         video.image,
 643                         piece->content->video->crop (),
 644                         piece->content->video->fade (video.frame),
 645                         piece->content->video->scale().size (
 646                                 piece->content->video, _video_container_size, _film->frame_size ()
 647                                 ),
 648                         _video_container_size,
 649                         video.eyes,
 650                         video.part,
 651                         piece->content->video->colour_conversion ()
 652                         )
 653                 );
 654
 655         optional<PositionImage> subtitles = subtitles_for_frame (time);
 656         if (subtitles) {
 657                 _last_video->set_subtitle (subtitles.get ());
 658         }
 659
 660         Video (_last_video, time);
 661
 662         _last_video_time = time + one_video_frame ();
 663
 664         _active_subtitles.clear_before (time);
 665 }
 666
 667 void
 668 Player::audio_flush (shared_ptr<Piece> piece, AudioStreamPtr stream)
 669 {
 670         shared_ptr<AudioContent> content = piece->content->audio;
 671         DCPOMATIC_ASSERT (content);
 672
 673         shared_ptr<Resampler> r = resampler (content, stream, false);
 674         if (!r) {
 675                 return;
 676         }
 677
 678         pair<shared_ptr<const AudioBuffers>, Frame> ro = r->flush ();
 679         if (ro.first->frames() == 0) {
 680                 return;
 681         }
 682
 683         ContentAudio content_audio;
 684         content_audio.audio = ro.first;
 685         content_audio.frame = ro.second;
 686
 687         /* Compute time in the DCP */
 688         DCPTime time = resampled_audio_to_dcp (piece, content_audio.frame) + DCPTime::from_seconds (content->delay() / 1000.0);
 689
 690         audio_transform (content, stream, content_audio, time);
 691 }
 692
 693 /** Do our common processing on some audio */
 694 void
 695 Player::audio_transform (shared_ptr<AudioContent> content, AudioStreamPtr stream, ContentAudio content_audio, DCPTime time)
 696 {
 697         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
 698
 699         /* Gain */
 700
 701         if (content->gain() != 0) {
 702                 shared_ptr<AudioBuffers> gain (new AudioBuffers (content_audio.audio));
 703                 gain->apply_gain (content->gain ());
 704                 content_audio.audio = gain;
 705         }
 706
 707         /* Remap */
 708
 709         shared_ptr<AudioBuffers> dcp_mapped (new AudioBuffers (_film->audio_channels(), content_audio.audio->frames()));
 710         dcp_mapped->make_silent ();
 711
 712         AudioMapping map = stream->mapping ();
 713         for (int i = 0; i < map.input_channels(); ++i) {
 714                 for (int j = 0; j < dcp_mapped->channels(); ++j) {
 715                         if (map.get (i, static_cast<dcp::Channel> (j)) > 0) {
 716                                 dcp_mapped->accumulate_channel (
 717                                         content_audio.audio.get(),
 718                                         i,
 719                                         static_cast<dcp::Channel> (j),
 720                                         map.get (i, static_cast<dcp::Channel> (j))
 721                                         );
 722                         }
 723                 }
 724         }
 725
 726         content_audio.audio = dcp_mapped;
 727
 728         /* Process */
 729
 730         if (_audio_processor) {
 731                 content_audio.audio = _audio_processor->run (content_audio.audio, _film->audio_channels ());
 732         }
 733
 734         /* Push */
 735
 736         _audio_merger.push (content_audio.audio, time);
 737         DCPOMATIC_ASSERT (_stream_states.find (stream) != _stream_states.end ());
 738         _stream_states[stream].last_push_end = time + DCPTime::from_frames (content_audio.audio->frames(), _film->audio_frame_rate());
 739 }
 740
 741 void
 742 Player::audio (weak_ptr<Piece> wp, AudioStreamPtr stream, ContentAudio content_audio)
 743 {
 744         DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
 745
 746         shared_ptr<Piece> piece = wp.lock ();
 747         if (!piece) {
 748                 return;
 749         }
 750
 751         shared_ptr<AudioContent> content = piece->content->audio;
 752         DCPOMATIC_ASSERT (content);
 753
 754         /* Resample */
 755         if (stream->frame_rate() != content->resampled_frame_rate()) {
 756                 shared_ptr<Resampler> r = resampler (content, stream, true);
 757                 pair<shared_ptr<const AudioBuffers>, Frame> ro = r->run (content_audio.audio, content_audio.frame);
 758                 if (ro.first->frames() == 0) {
 759                         return;
 760                 }
 761                 content_audio.audio = ro.first;
 762                 content_audio.frame = ro.second;
 763         }
 764
 765         /* Compute time in the DCP */
 766         DCPTime time = resampled_audio_to_dcp (piece, content_audio.frame) + DCPTime::from_seconds (content->delay() / 1000.0);
 767         /* And the end of this block in the DCP */
 768         DCPTime end = time + DCPTime::from_frames(content_audio.audio->frames(), content->resampled_frame_rate());
 769
 770         /* Remove anything that comes before the start or after the end of the content */
 771         if (time < piece->content->position()) {
 772                 pair<shared_ptr<AudioBuffers>, DCPTime> cut = discard_audio (content_audio.audio, time, piece->content->position());
 773                 if (!cut.first) {
 774                         /* This audio is entirely discarded */
 775                         return;
 776                 }
 777                 content_audio.audio = cut.first;
 778                 time = cut.second;
 779         } else if (time > piece->content->end()) {
 780                 /* Discard it all */
 781                 return;
 782         } else if (end > piece->content->end()) {
 783                 Frame const remaining_frames = DCPTime(piece->content->end() - time).frames_round(_film->audio_frame_rate());
 784                 DCPOMATIC_ASSERT (remaining_frames > 0);
 785                 shared_ptr<AudioBuffers> cut (new AudioBuffers (content_audio.audio->channels(), remaining_frames));
 786                 cut->copy_from (content_audio.audio.get(), remaining_frames, 0, 0);
 787                 content_audio.audio = cut;
 788         }
 789
 790         audio_transform (content, stream, content_audio, time);
 791 }
 792
 793 void
 794 Player::image_subtitle_start (weak_ptr<Piece> wp, ContentImageSubtitle subtitle)
 795 {
 796         shared_ptr<Piece> piece = wp.lock ();
 797         if (!piece) {
 798                 return;
 799         }
 800
 801         /* Apply content's subtitle offsets */
 802         subtitle.sub.rectangle.x += piece->content->subtitle->x_offset ();
 803         subtitle.sub.rectangle.y += piece->content->subtitle->y_offset ();
 804
 805         /* Apply content's subtitle scale */
 806         subtitle.sub.rectangle.width *= piece->content->subtitle->x_scale ();
 807         subtitle.sub.rectangle.height *= piece->content->subtitle->y_scale ();
 808
 809         /* Apply a corrective translation to keep the subtitle centred after that scale */
 810         subtitle.sub.rectangle.x -= subtitle.sub.rectangle.width * (piece->content->subtitle->x_scale() - 1);
 811         subtitle.sub.rectangle.y -= subtitle.sub.rectangle.height * (piece->content->subtitle->y_scale() - 1);
 812
 813         PlayerSubtitles ps;
 814         ps.image.push_back (subtitle.sub);
 815         DCPTime from (content_time_to_dcp (piece, subtitle.from()));
 816
 817         _active_subtitles.add_from (wp, ps, from);
 818 }
 819
 820 void
 821 Player::text_subtitle_start (weak_ptr<Piece> wp, ContentTextSubtitle subtitle)
 822 {
 823         shared_ptr<Piece> piece = wp.lock ();
 824         if (!piece) {
 825                 return;
 826         }
 827
 828         PlayerSubtitles ps;
 829         DCPTime const from (content_time_to_dcp (piece, subtitle.from()));
 830
 831         BOOST_FOREACH (dcp::SubtitleString s, subtitle.subs) {
 832                 s.set_h_position (s.h_position() + piece->content->subtitle->x_offset ());
 833                 s.set_v_position (s.v_position() + piece->content->subtitle->y_offset ());
 834                 float const xs = piece->content->subtitle->x_scale();
 835                 float const ys = piece->content->subtitle->y_scale();
 836                 float size = s.size();
 837
 838                 /* Adjust size to express the common part of the scaling;
 839                    e.g. if xs = ys = 0.5 we scale size by 2.
 840                 */
 841                 if (xs > 1e-5 && ys > 1e-5) {
 842                         size *= 1 / min (1 / xs, 1 / ys);
 843                 }
 844                 s.set_size (size);
 845
 846                 /* Then express aspect ratio changes */
 847                 if (fabs (1.0 - xs / ys) > dcp::ASPECT_ADJUST_EPSILON) {
 848                         s.set_aspect_adjust (xs / ys);
 849                 }
 850
 851                 s.set_in (dcp::Time(from.seconds(), 1000));
 852                 ps.text.push_back (SubtitleString (s, piece->content->subtitle->outline_width()));
 853                 ps.add_fonts (piece->content->subtitle->fonts ());
 854         }
 855
 856         _active_subtitles.add_from (wp, ps, from);
 857 }
 858
 859 void
 860 Player::subtitle_stop (weak_ptr<Piece> wp, ContentTime to)
 861 {
 862         if (!_active_subtitles.have (wp)) {
 863                 return;
 864         }
 865
 866         shared_ptr<Piece> piece = wp.lock ();
 867         if (!piece) {
 868                 return;
 869         }
 870
 871         DCPTime const dcp_to = content_time_to_dcp (piece, to);
 872
 873         pair<PlayerSubtitles, DCPTime> from = _active_subtitles.add_to (wp, dcp_to);
 874
 875         if (piece->content->subtitle->use() && !_always_burn_subtitles && !piece->content->subtitle->burn()) {
 876                 Subtitle (from.first, DCPTimePeriod (from.second, dcp_to));
 877         }
 878 }
 879
 880 void
 881 Player::seek (DCPTime time, bool accurate)
 882 {
 883         if (_audio_processor) {
 884                 _audio_processor->flush ();
 885         }
 886
 887         for (ResamplerMap::iterator i = _resamplers.begin(); i != _resamplers.end(); ++i) {
 888                 i->second->flush ();
 889                 i->second->reset ();
 890         }
 891
 892         _audio_merger.clear ();
 893         _active_subtitles.clear ();
 894
 895         BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
 896                 if (time < i->content->position()) {
 897                         /* Before; seek to 0 */
 898                         i->decoder->seek (ContentTime(), accurate);
 899                         i->done = false;
 900                 } else if (i->content->position() <= time && time < i->content->end()) {
 901                         /* During; seek to position */
 902                         i->decoder->seek (dcp_to_content_time (i, time), accurate);
 903                         i->done = false;
 904                 } else {
 905                         /* After; this piece is done */
 906                         i->done = true;
 907                 }
 908         }
 909
 910         if (accurate) {
 911                 _last_video_time = time;
 912                 _last_audio_time = time;
 913         } else {
 914                 _last_video_time = optional<DCPTime> ();
 915                 _last_audio_time = optional<DCPTime> ();
 916         }
 917
 918         _last_seek_time = time;
 919 }
 920
 921 shared_ptr<Resampler>
 922 Player::resampler (shared_ptr<const AudioContent> content, AudioStreamPtr stream, bool create)
 923 {
 924         ResamplerMap::const_iterator i = _resamplers.find (make_pair (content, stream));
 925         if (i != _resamplers.end ()) {
 926                 return i->second;
 927         }
 928
 929         if (!create) {
 930                 return shared_ptr<Resampler> ();
 931         }
 932
 933         LOG_GENERAL (
 934                 "Creating new resampler from %1 to %2 with %3 channels",
 935                 stream->frame_rate(),
 936                 content->resampled_frame_rate(),
 937                 stream->channels()
 938                 );
 939
 940         shared_ptr<Resampler> r (
 941                 new Resampler (stream->frame_rate(), content->resampled_frame_rate(), stream->channels())
 942                 );
 943
 944         _resamplers[make_pair(content, stream)] = r;
 945         return r;
 946 }
 947
 948 void
 949 Player::fill_video (DCPTimePeriod period)
 950 {
 951         /* XXX: this may not work for 3D */
 952         BOOST_FOREACH (DCPTimePeriod i, subtract(period, _no_video)) {
 953                 for (DCPTime j = i.from; j < i.to; j += one_video_frame()) {
 954                         if (_playlist->video_content_at(j) && _last_video) {
 955                                 Video (shared_ptr<PlayerVideo> (new PlayerVideo (*_last_video)), j);
 956                         } else {
 957                                 shared_ptr<PlayerVideo> black = black_player_video_frame ();
 958                                 optional<PositionImage> subtitles = subtitles_for_frame (j);
 959                                 if (subtitles) {
 960                                         black->set_subtitle (subtitles.get ());
 961                                 }
 962                                 Video (black, j);
 963                         }
 964                         _last_video_time = j;
 965                 }
 966         }
 967 }
 968
 969 void
 970 Player::fill_audio (DCPTimePeriod period)
 971 {
 972         BOOST_FOREACH (DCPTimePeriod i, subtract(period, _no_audio)) {
 973                 DCPTime t = i.from;
 974                 while (t < i.to) {
 975                         DCPTime block = min (DCPTime::from_seconds (0.5), i.to - t);
 976                         Frame const samples = block.frames_round(_film->audio_frame_rate());
 977                         if (samples) {
 978                                 shared_ptr<AudioBuffers> silence (new AudioBuffers (_film->audio_channels(), samples));
 979                                 silence->make_silent ();
 980                                 Audio (silence, t);
 981                         }
 982                         t += block;
 983                 }
 984         }
 985 }
 986
 987 DCPTime
 988 Player::one_video_frame () const
 989 {
 990         return DCPTime::from_frames (1, _film->video_frame_rate ());
 991 }
 992
 993 pair<shared_ptr<AudioBuffers>, DCPTime>
 994 Player::discard_audio (shared_ptr<const AudioBuffers> audio, DCPTime time, DCPTime discard_to) const
 995 {
 996         DCPTime const discard_time = discard_to - time;
 997         Frame const discard_frames = discard_time.frames_round(_film->audio_frame_rate());
 998         Frame remaining_frames = audio->frames() - discard_frames;
 999         if (remaining_frames <= 0) {
1000                 return make_pair(shared_ptr<AudioBuffers>(), DCPTime());
1001         }
1002         shared_ptr<AudioBuffers> cut (new AudioBuffers (audio->channels(), remaining_frames));
1003         cut->copy_from (audio.get(), remaining_frames, discard_frames, 0);
1004         return make_pair(cut, time + discard_time);
1005 }