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