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