src/lib/dcp_decoder.cc

   1 /*
   2     Copyright (C) 2014-2021 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
  22 #include "atmos_decoder.h"
  23 #include "audio_content.h"
  24 #include "audio_decoder.h"
  25 #include "config.h"
  26 #include "dcp_content.h"
  27 #include "dcp_decoder.h"
  28 #include "digester.h"
  29 #include "ffmpeg_image_proxy.h"
  30 #include "frame_interval_checker.h"
  31 #include "image.h"
  32 #include "j2k_image_proxy.h"
  33 #include "text_decoder.h"
  34 #include "video_decoder.h"
  35 #include <dcp/cpl.h>
  36 #include <dcp/dcp.h>
  37 #include <dcp/decrypted_kdm.h>
  38 #include <dcp/mono_picture_asset.h>
  39 #include <dcp/mono_picture_asset_reader.h>
  40 #include <dcp/mono_picture_frame.h>
  41 #include <dcp/reel.h>
  42 #include <dcp/reel_atmos_asset.h>
  43 #include <dcp/reel_closed_caption_asset.h>
  44 #include <dcp/reel_picture_asset.h>
  45 #include <dcp/reel_sound_asset.h>
  46 #include <dcp/reel_subtitle_asset.h>
  47 #include <dcp/sound_asset_reader.h>
  48 #include <dcp/sound_frame.h>
  49 #include <dcp/stereo_picture_asset.h>
  50 #include <dcp/stereo_picture_asset_reader.h>
  51 #include <dcp/stereo_picture_frame.h>
  52 #include <dcp/subtitle_image.h>
  53 #include <iostream>
  54
  55 #include "i18n.h"
  56
  57
  58 using std::list;
  59 using std::cout;
  60 using std::map;
  61 using std::string;
  62 using std::vector;
  63 using std::shared_ptr;
  64 using std::dynamic_pointer_cast;
  65 using std::make_shared;
  66 using boost::optional;
  67 using namespace dcpomatic;
  68
  69
  70 DCPDecoder::DCPDecoder (shared_ptr<const Film> film, shared_ptr<const DCPContent> c, bool fast, bool tolerant, shared_ptr<DCPDecoder> old)
  71         : DCP (c, tolerant)
  72         , Decoder (film)
  73 {
  74         if (c->can_be_played()) {
  75                 if (c->video) {
  76                         video = make_shared<VideoDecoder>(this, c);
  77                 }
  78                 if (c->audio) {
  79                         audio = make_shared<AudioDecoder>(this, c->audio, fast);
  80                 }
  81                 for (auto i: c->text) {
  82                         /* XXX: this time here should be the time of the first subtitle, not 0 */
  83                         text.push_back (make_shared<TextDecoder>(this, i, ContentTime()));
  84                 }
  85                 if (c->atmos) {
  86                         atmos = make_shared<AtmosDecoder>(this, c);
  87                 }
  88         }
  89
  90         /* We try to avoid re-scanning the DCP's files every time we make a new DCPDecoder; we do this
  91            by re-using the _reels list.  Before we do this we need to check that nothing too serious
  92            has changed in the DCPContent.
  93
  94            We do this by storing a digest of the important bits of the DCPContent and then checking that's
  95            the same before we re-use _reels.
  96         */
  97
  98         _lazy_digest = calculate_lazy_digest (c);
  99
 100         if (old && old->lazy_digest() == _lazy_digest) {
 101                 _reels = old->_reels;
 102         } else {
 103
 104                 auto cpl_list = cpls ();
 105
 106                 if (cpl_list.empty()) {
 107                         throw DCPError (_("No CPLs found in DCP."));
 108                 }
 109
 110                 shared_ptr<dcp::CPL> cpl;
 111                 for (auto i: cpl_list) {
 112                         if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
 113                                 cpl = i;
 114                         }
 115                 }
 116
 117                 if (!cpl) {
 118                         /* No CPL found; probably an old file that doesn't specify it;
 119                            just use the first one.
 120                         */
 121                         cpl = cpls().front ();
 122                 }
 123
 124                 _reels = cpl->reels ();
 125         }
 126
 127         set_decode_referenced (false);
 128
 129         _reel = _reels.begin ();
 130         get_readers ();
 131 }
 132
 133
 134 bool
 135 DCPDecoder::pass ()
 136 {
 137         if (!_dcp_content->can_be_played()) {
 138                 return true;
 139         }
 140
 141         if (_reel == _reels.end()) {
 142                 if (audio) {
 143                         audio->flush ();
 144                 }
 145                 return true;
 146         }
 147
 148         auto const vfr = _dcp_content->active_video_frame_rate (film());
 149
 150         /* Frame within the (played part of the) reel that is coming up next */
 151         auto const frame = _next.frames_round (vfr);
 152
 153         auto picture_asset = (*_reel)->main_picture()->asset();
 154         DCPOMATIC_ASSERT (picture_asset);
 155
 156         /* We must emit texts first as when we emit the video for this frame
 157            it will expect already to have the texts.
 158         */
 159         pass_texts (_next, picture_asset->size());
 160
 161         if ((_mono_reader || _stereo_reader) && (_decode_referenced || !_dcp_content->reference_video())) {
 162                 auto const entry_point = (*_reel)->main_picture()->entry_point().get_value_or(0);
 163                 if (_mono_reader) {
 164                         video->emit (
 165                                 film(),
 166                                 std::make_shared<J2KImageProxy>(
 167                                         _mono_reader->get_frame (entry_point + frame),
 168                                         picture_asset->size(),
 169                                         AV_PIX_FMT_XYZ12LE,
 170                                         _forced_reduction
 171                                         ),
 172                                 _offset + frame
 173                                 );
 174                 } else {
 175                         video->emit (
 176                                 film(),
 177                                 std::make_shared<J2KImageProxy>(
 178                                         _stereo_reader->get_frame (entry_point + frame),
 179                                         picture_asset->size(),
 180                                         dcp::Eye::LEFT,
 181                                         AV_PIX_FMT_XYZ12LE,
 182                                         _forced_reduction
 183                                         ),
 184                                 _offset + frame
 185                                 );
 186
 187                         video->emit (
 188                                 film(),
 189                                 std::make_shared<J2KImageProxy>(
 190                                         _stereo_reader->get_frame (entry_point + frame),
 191                                         picture_asset->size(),
 192                                         dcp::Eye::RIGHT,
 193                                         AV_PIX_FMT_XYZ12LE,
 194                                         _forced_reduction
 195                                         ),
 196                                 _offset + frame
 197                                 );
 198                 }
 199         }
 200
 201         if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
 202                 auto const entry_point = (*_reel)->main_sound()->entry_point().get_value_or(0);
 203                 auto sf = _sound_reader->get_frame (entry_point + frame);
 204                 auto from = sf->data ();
 205
 206                 int const channels = _dcp_content->audio->stream()->channels ();
 207                 int const frames = sf->size() / (3 * channels);
 208                 auto data = make_shared<AudioBuffers>(channels, frames);
 209                 auto data_data = data->data();
 210                 for (int i = 0; i < frames; ++i) {
 211                         for (int j = 0; j < channels; ++j) {
 212                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 213                                 from += 3;
 214                         }
 215                 }
 216
 217                 audio->emit (film(), _dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 218         }
 219
 220         if (_atmos_reader) {
 221                 DCPOMATIC_ASSERT (_atmos_metadata);
 222                 auto const entry_point = (*_reel)->atmos()->entry_point().get_value_or(0);
 223                 atmos->emit (film(), _atmos_reader->get_frame(entry_point + frame), _offset + frame, *_atmos_metadata);
 224         }
 225
 226         _next += ContentTime::from_frames (1, vfr);
 227
 228         if ((*_reel)->main_picture ()) {
 229                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 230                         next_reel ();
 231                         _next = ContentTime ();
 232                 }
 233         }
 234
 235         return false;
 236 }
 237
 238
 239 void
 240 DCPDecoder::pass_texts (ContentTime next, dcp::Size size)
 241 {
 242         auto decoder = text.begin ();
 243         if (decoder == text.end()) {
 244                 /* It's possible that there is now a main subtitle but no TextDecoders, for example if
 245                    the CPL has just changed but the TextContent's texts have not been recreated yet.
 246                 */
 247                 return;
 248         }
 249
 250         if ((*_reel)->main_subtitle()) {
 251                 pass_texts (
 252                         next,
 253                         (*_reel)->main_subtitle()->asset(),
 254                         _dcp_content->reference_text(TextType::OPEN_SUBTITLE),
 255                         (*_reel)->main_subtitle()->entry_point().get_value_or(0),
 256                         *decoder,
 257                         size
 258                         );
 259                 ++decoder;
 260         }
 261
 262         for (auto i: (*_reel)->closed_captions()) {
 263                 pass_texts (
 264                         next, i->asset(), _dcp_content->reference_text(TextType::CLOSED_CAPTION), i->entry_point().get_value_or(0), *decoder, size
 265                         );
 266                 ++decoder;
 267         }
 268 }
 269
 270
 271 void
 272 DCPDecoder::pass_texts (
 273         ContentTime next, shared_ptr<dcp::SubtitleAsset> asset, bool reference, int64_t entry_point, shared_ptr<TextDecoder> decoder, dcp::Size size
 274         )
 275 {
 276         auto const vfr = _dcp_content->active_video_frame_rate (film());
 277         /* Frame within the (played part of the) reel that is coming up next */
 278         auto const frame = next.frames_round (vfr);
 279
 280         if (_decode_referenced || !reference) {
 281                 auto subs = asset->subtitles_during (
 282                         dcp::Time (entry_point + frame, vfr, vfr),
 283                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 284                         true
 285                         );
 286
 287                 list<dcp::SubtitleString> strings;
 288
 289                 for (auto i: subs) {
 290                         auto is = dynamic_pointer_cast<const dcp::SubtitleString>(i);
 291                         if (is) {
 292                                 if (!strings.empty() && (strings.back().in() != is->in() || strings.back().out() != is->out())) {
 293                                         auto b = strings.back();
 294                                         decoder->emit_plain (
 295                                                 ContentTimePeriod (
 296                                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
 297                                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
 298                                                         ),
 299                                                 strings
 300                                                 );
 301                                         strings.clear ();
 302                                 }
 303
 304                                 strings.push_back (*is);
 305                         }
 306
 307                         /* XXX: perhaps these image subs should also be collected together like the string ones are;
 308                            this would need to be done both here and in DCPSubtitleDecoder.
 309                         */
 310
 311                         auto ii = dynamic_pointer_cast<const dcp::SubtitleImage>(i);
 312                         if (ii) {
 313                                 emit_subtitle_image (
 314                                         ContentTimePeriod (
 315                                                 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->in().as_seconds ()),
 316                                                 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->out().as_seconds ())
 317                                                 ),
 318                                         *ii,
 319                                         size,
 320                                         decoder
 321                                         );
 322                         }
 323                 }
 324
 325                 if (!strings.empty()) {
 326                         auto b = strings.back();
 327                         decoder->emit_plain (
 328                                 ContentTimePeriod (
 329                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
 330                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
 331                                         ),
 332                                 strings
 333                                 );
 334                         strings.clear ();
 335                 }
 336         }
 337 }
 338
 339
 340 void
 341 DCPDecoder::next_reel ()
 342 {
 343         _offset += (*_reel)->main_picture()->actual_duration();
 344         ++_reel;
 345         get_readers ();
 346 }
 347
 348
 349 void
 350 DCPDecoder::get_readers ()
 351 {
 352         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 353                 _mono_reader.reset ();
 354                 _stereo_reader.reset ();
 355                 _sound_reader.reset ();
 356                 _atmos_reader.reset ();
 357                 return;
 358         }
 359
 360         if ((*_reel)->main_picture()) {
 361                 auto asset = (*_reel)->main_picture()->asset();
 362                 auto mono = dynamic_pointer_cast<dcp::MonoPictureAsset>(asset);
 363                 auto stereo = dynamic_pointer_cast<dcp::StereoPictureAsset>(asset);
 364                 DCPOMATIC_ASSERT (mono || stereo);
 365                 if (mono) {
 366                         _mono_reader = mono->start_read ();
 367                         _mono_reader->set_check_hmac (false);
 368                         _stereo_reader.reset ();
 369                 } else {
 370                         _stereo_reader = stereo->start_read ();
 371                         _stereo_reader->set_check_hmac (false);
 372                         _mono_reader.reset ();
 373                 }
 374         } else {
 375                 _mono_reader.reset ();
 376                 _stereo_reader.reset ();
 377         }
 378
 379         if ((*_reel)->main_sound()) {
 380                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 381                 _sound_reader->set_check_hmac (false);
 382         } else {
 383                 _sound_reader.reset ();
 384         }
 385
 386         if ((*_reel)->atmos()) {
 387                 auto asset = (*_reel)->atmos()->asset();
 388                 _atmos_reader = asset->start_read();
 389                 _atmos_reader->set_check_hmac (false);
 390                 _atmos_metadata = AtmosMetadata (asset);
 391         } else {
 392                 _atmos_reader.reset ();
 393                 _atmos_metadata = boost::none;
 394         }
 395 }
 396
 397
 398 void
 399 DCPDecoder::seek (ContentTime t, bool accurate)
 400 {
 401         if (!_dcp_content->can_be_played ()) {
 402                 return;
 403         }
 404
 405         Decoder::seek (t, accurate);
 406
 407         _reel = _reels.begin ();
 408         _offset = 0;
 409         get_readers ();
 410
 411         int const pre_roll_seconds = 2;
 412
 413         /* Pre-roll for subs */
 414
 415         auto pre = t - ContentTime::from_seconds (pre_roll_seconds);
 416         if (pre < ContentTime()) {
 417                 pre = ContentTime ();
 418         }
 419
 420         /* Seek to pre-roll position */
 421
 422         while (
 423                 _reel != _reels.end() &&
 424                 pre >= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()))
 425                 ) {
 426
 427                 auto rd = ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()));
 428                 pre -= rd;
 429                 t -= rd;
 430                 next_reel ();
 431         }
 432
 433         /* Pass texts in the pre-roll */
 434
 435         auto const vfr = _dcp_content->active_video_frame_rate (film());
 436         for (int i = 0; i < pre_roll_seconds * vfr; ++i) {
 437                 pass_texts (pre, (*_reel)->main_picture()->asset()->size());
 438                 pre += ContentTime::from_frames (1, vfr);
 439         }
 440
 441         /* Seek to correct position */
 442
 443         while (
 444                 _reel != _reels.end() &&
 445                 t >= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()))
 446                 ) {
 447
 448                 t -= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()));
 449                 next_reel ();
 450         }
 451
 452         _next = t;
 453 }
 454
 455
 456 void
 457 DCPDecoder::set_decode_referenced (bool r)
 458 {
 459         _decode_referenced = r;
 460
 461         if (video) {
 462                 video->set_ignore (_dcp_content->reference_video() && !_decode_referenced);
 463         }
 464         if (audio) {
 465                 audio->set_ignore (_dcp_content->reference_audio() && !_decode_referenced);
 466         }
 467 }
 468
 469
 470 void
 471 DCPDecoder::set_forced_reduction (optional<int> reduction)
 472 {
 473         _forced_reduction = reduction;
 474 }
 475
 476
 477 string
 478 DCPDecoder::calculate_lazy_digest (shared_ptr<const DCPContent> c) const
 479 {
 480         Digester d;
 481         for (auto i: c->paths()) {
 482                 d.add (i.string());
 483         }
 484         if (_dcp_content->kdm()) {
 485                 d.add(_dcp_content->kdm()->id());
 486         }
 487         d.add (static_cast<bool>(c->cpl()));
 488         if (c->cpl()) {
 489                 d.add (c->cpl().get());
 490         }
 491         return d.get ();
 492 }
 493
 494
 495 ContentTime
 496 DCPDecoder::position () const
 497 {
 498         return ContentTime::from_frames(_offset, _dcp_content->active_video_frame_rate(film())) + _next;
 499 }
 500
 501
 502 vector<FontData>
 503 DCPDecoder::fonts () const
 504 {
 505         vector<FontData> data;
 506         for (auto i: _reels) {
 507                 if (i->main_subtitle() && i->main_subtitle()->asset()) {
 508                         for (auto const& j: i->main_subtitle()->asset()->font_data()) {
 509                                 data.push_back (FontData(j.first, j.second));
 510                         }
 511                 }
 512         }
 513         return data;
 514 }
 515