src/lib/dcp_decoder.cc

   1 /*
   2     Copyright (C) 2014-2022 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 "constants.h"
  27 #include "dcp_content.h"
  28 #include "dcp_decoder.h"
  29 #include "digester.h"
  30 #include "ffmpeg_image_proxy.h"
  31 #include "frame_interval_checker.h"
  32 #include "image.h"
  33 #include "j2k_image_proxy.h"
  34 #include "text_decoder.h"
  35 #include "video_decoder.h"
  36 #include <dcp/cpl.h>
  37 #include <dcp/dcp.h>
  38 #include <dcp/decrypted_kdm.h>
  39 #include <dcp/mono_picture_asset.h>
  40 #include <dcp/mono_picture_asset_reader.h>
  41 #include <dcp/mono_picture_frame.h>
  42 #include <dcp/reel.h>
  43 #include <dcp/reel_atmos_asset.h>
  44 #include <dcp/reel_closed_caption_asset.h>
  45 #include <dcp/reel_picture_asset.h>
  46 #include <dcp/reel_sound_asset.h>
  47 #include <dcp/reel_subtitle_asset.h>
  48 #include <dcp/search.h>
  49 #include <dcp/sound_asset_reader.h>
  50 #include <dcp/sound_frame.h>
  51 #include <dcp/stereo_picture_asset.h>
  52 #include <dcp/stereo_picture_asset_reader.h>
  53 #include <dcp/stereo_picture_frame.h>
  54 #include <dcp/subtitle_image.h>
  55 #include <iostream>
  56
  57 #include "i18n.h"
  58
  59
  60 using std::cout;
  61 using std::dynamic_pointer_cast;
  62 using std::list;
  63 using std::make_shared;
  64 using std::map;
  65 using std::shared_ptr;
  66 using std::string;
  67 using std::vector;
  68 using boost::optional;
  69 using namespace dcpomatic;
  70
  71
  72 DCPDecoder::DCPDecoder (shared_ptr<const Film> film, shared_ptr<const DCPContent> content, bool fast, bool tolerant, shared_ptr<DCPDecoder> old)
  73         : Decoder (film)
  74         , _dcp_content (content)
  75 {
  76         if (content->can_be_played()) {
  77                 if (content->video) {
  78                         video = make_shared<VideoDecoder>(this, content);
  79                 }
  80                 if (content->audio) {
  81                         audio = make_shared<AudioDecoder>(this, content->audio, fast);
  82                 }
  83                 for (auto i: content->text) {
  84                         text.push_back (make_shared<TextDecoder>(this, i));
  85                         /* We should really call maybe_set_position() on this TextDecoder to set the time
  86                          * of the first subtitle, but it probably doesn't matter since we'll always
  87                          * have regularly occurring video (and maybe audio) content.
  88                          */
  89                 }
  90                 if (content->atmos) {
  91                         atmos = make_shared<AtmosDecoder>(this, content);
  92                 }
  93         }
  94
  95         /* We try to avoid re-scanning the DCP's files every time we make a new DCPDecoder; we do this
  96            by re-using the _reels list.  Before we do this we need to check that nothing too serious
  97            has changed in the DCPContent.
  98
  99            We do this by storing a digest of the important bits of the DCPContent and then checking that's
 100            the same before we re-use _reels.
 101         */
 102
 103         _lazy_digest = calculate_lazy_digest (content);
 104
 105         if (old && old->lazy_digest() == _lazy_digest) {
 106                 _reels = old->_reels;
 107         } else {
 108                 auto cpl_list = dcp::find_and_resolve_cpls(content->directories(), tolerant);
 109
 110                 if (cpl_list.empty()) {
 111                         throw DCPError (_("No CPLs found in DCP."));
 112                 }
 113
 114                 shared_ptr<dcp::CPL> cpl;
 115                 for (auto i: cpl_list) {
 116                         if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
 117                                 cpl = i;
 118                         }
 119                 }
 120
 121                 if (!cpl) {
 122                         /* No CPL found; probably an old file that doesn't specify it;
 123                            just use the first one.
 124                         */
 125                         cpl = cpl_list.front();
 126                 }
 127
 128                 if (content->kdm()) {
 129                         cpl->add (decrypt_kdm_with_helpful_error(content->kdm().get()));
 130                 }
 131
 132                 _reels = cpl->reels ();
 133         }
 134
 135         set_decode_referenced (false);
 136
 137         _reel = _reels.begin ();
 138         get_readers ();
 139
 140         _font_id_allocator.add_fonts_from_reels(_reels);
 141         _font_id_allocator.allocate();
 142 }
 143
 144
 145 bool
 146 DCPDecoder::pass ()
 147 {
 148         if (!_dcp_content->can_be_played()) {
 149                 return true;
 150         }
 151
 152         if (_reel == _reels.end()) {
 153                 if (audio) {
 154                         audio->flush ();
 155                 }
 156                 return true;
 157         }
 158
 159         auto const vfr = _dcp_content->active_video_frame_rate (film());
 160
 161         /* Frame within the (played part of the) reel that is coming up next */
 162         auto const frame = _next.frames_round (vfr);
 163
 164         auto picture_asset = (*_reel)->main_picture()->asset();
 165         DCPOMATIC_ASSERT (picture_asset);
 166
 167         /* We must emit texts first as when we emit the video for this frame
 168            it will expect already to have the texts.
 169         */
 170         pass_texts (_next, picture_asset->size());
 171
 172         if ((_mono_reader || _stereo_reader) && (_decode_referenced || !_dcp_content->reference_video())) {
 173                 auto const entry_point = (*_reel)->main_picture()->entry_point().get_value_or(0);
 174                 if (_mono_reader) {
 175                         video->emit (
 176                                 film(),
 177                                 std::make_shared<J2KImageProxy>(
 178                                         _mono_reader->get_frame (entry_point + frame),
 179                                         picture_asset->size(),
 180                                         AV_PIX_FMT_XYZ12LE,
 181                                         _forced_reduction
 182                                         ),
 183                                 _offset + frame
 184                                 );
 185                 } else {
 186                         video->emit (
 187                                 film(),
 188                                 std::make_shared<J2KImageProxy>(
 189                                         _stereo_reader->get_frame (entry_point + frame),
 190                                         picture_asset->size(),
 191                                         dcp::Eye::LEFT,
 192                                         AV_PIX_FMT_XYZ12LE,
 193                                         _forced_reduction
 194                                         ),
 195                                 _offset + frame
 196                                 );
 197
 198                         video->emit (
 199                                 film(),
 200                                 std::make_shared<J2KImageProxy>(
 201                                         _stereo_reader->get_frame (entry_point + frame),
 202                                         picture_asset->size(),
 203                                         dcp::Eye::RIGHT,
 204                                         AV_PIX_FMT_XYZ12LE,
 205                                         _forced_reduction
 206                                         ),
 207                                 _offset + frame
 208                                 );
 209                 }
 210         }
 211
 212         if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
 213                 auto const entry_point = (*_reel)->main_sound()->entry_point().get_value_or(0);
 214                 auto sf = _sound_reader->get_frame (entry_point + frame);
 215                 auto from = sf->data ();
 216
 217                 int const channels = _dcp_content->audio->stream()->channels ();
 218                 int const frames = sf->size() / (3 * channels);
 219                 auto data = make_shared<AudioBuffers>(channels, frames);
 220                 auto data_data = data->data();
 221                 for (int i = 0; i < frames; ++i) {
 222                         for (int j = 0; j < channels; ++j) {
 223                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 224                                 from += 3;
 225                         }
 226                 }
 227
 228                 audio->emit (film(), _dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 229         }
 230
 231         if (_atmos_reader) {
 232                 DCPOMATIC_ASSERT (_atmos_metadata);
 233                 auto const entry_point = (*_reel)->atmos()->entry_point().get_value_or(0);
 234                 atmos->emit (film(), _atmos_reader->get_frame(entry_point + frame), _offset + frame, *_atmos_metadata);
 235         }
 236
 237         _next += ContentTime::from_frames (1, vfr);
 238
 239         if ((*_reel)->main_picture ()) {
 240                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 241                         next_reel ();
 242                         _next = ContentTime ();
 243                 }
 244         }
 245
 246         return false;
 247 }
 248
 249
 250 void
 251 DCPDecoder::pass_texts (ContentTime next, dcp::Size size)
 252 {
 253         auto decoder = text.begin ();
 254         if (decoder == text.end()) {
 255                 /* It's possible that there is now a main subtitle but no TextDecoders, for example if
 256                    the CPL has just changed but the TextContent's texts have not been recreated yet.
 257                 */
 258                 return;
 259         }
 260
 261         if ((*_reel)->main_subtitle()) {
 262                 pass_texts (
 263                         next,
 264                         (*_reel)->main_subtitle()->asset(),
 265                         _dcp_content->reference_text(TextType::OPEN_SUBTITLE),
 266                         (*_reel)->main_subtitle()->entry_point().get_value_or(0),
 267                         *decoder,
 268                         size
 269                         );
 270                 ++decoder;
 271         }
 272
 273         for (auto i: (*_reel)->closed_captions()) {
 274                 pass_texts (
 275                         next, i->asset(), _dcp_content->reference_text(TextType::CLOSED_CAPTION), i->entry_point().get_value_or(0), *decoder, size
 276                         );
 277                 ++decoder;
 278         }
 279 }
 280
 281 void
 282 DCPDecoder::pass_texts (
 283         ContentTime next, shared_ptr<dcp::SubtitleAsset> asset, bool reference, int64_t entry_point, shared_ptr<TextDecoder> decoder, dcp::Size size
 284         )
 285 {
 286         auto const vfr = _dcp_content->active_video_frame_rate (film());
 287         /* Frame within the (played part of the) reel that is coming up next */
 288         auto const frame = next.frames_round (vfr);
 289
 290         if (_decode_referenced || !reference) {
 291                 auto subs = asset->subtitles_during (
 292                         dcp::Time (entry_point + frame, vfr, vfr),
 293                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 294                         true
 295                         );
 296
 297                 vector<dcp::SubtitleString> strings;
 298
 299                 for (auto i: subs) {
 300                         auto is = dynamic_pointer_cast<const dcp::SubtitleString>(i);
 301                         if (is) {
 302                                 if (!strings.empty() && (strings.back().in() != is->in() || strings.back().out() != is->out())) {
 303                                         auto b = strings.back();
 304                                         decoder->emit_plain (
 305                                                 ContentTimePeriod (
 306                                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
 307                                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
 308                                                         ),
 309                                                 strings,
 310                                                 asset->subtitle_standard()
 311                                                 );
 312                                         strings.clear ();
 313                                 }
 314
 315                                 dcp::SubtitleString is_copy = *is;
 316                                 if (is_copy.font()) {
 317                                         is_copy.set_font(_font_id_allocator.font_id(_reel - _reels.begin(), asset->id(), is_copy.font().get()));
 318                                 } else {
 319                                         is_copy.set_font(_font_id_allocator.default_font_id());
 320                                 }
 321                                 strings.push_back(is_copy);
 322                         }
 323
 324                         /* XXX: perhaps these image subs should also be collected together like the string ones are;
 325                            this would need to be done both here and in DCPSubtitleDecoder.
 326                         */
 327
 328                         auto ii = dynamic_pointer_cast<const dcp::SubtitleImage>(i);
 329                         if (ii) {
 330                                 emit_subtitle_image (
 331                                         ContentTimePeriod (
 332                                                 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->in().as_seconds ()),
 333                                                 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->out().as_seconds ())
 334                                                 ),
 335                                         *ii,
 336                                         size,
 337                                         decoder
 338                                         );
 339                         }
 340                 }
 341
 342                 if (!strings.empty()) {
 343                         auto b = strings.back();
 344                         decoder->emit_plain (
 345                                 ContentTimePeriod (
 346                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
 347                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
 348                                         ),
 349                                 strings,
 350                                 asset->subtitle_standard()
 351                                 );
 352                         strings.clear ();
 353                 }
 354         }
 355 }
 356
 357
 358 void
 359 DCPDecoder::next_reel ()
 360 {
 361         _offset += (*_reel)->main_picture()->actual_duration();
 362         ++_reel;
 363         get_readers ();
 364 }
 365
 366
 367 void
 368 DCPDecoder::get_readers ()
 369 {
 370         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 371                 _mono_reader.reset ();
 372                 _stereo_reader.reset ();
 373                 _sound_reader.reset ();
 374                 _atmos_reader.reset ();
 375                 return;
 376         }
 377
 378         if (video && !video->ignore() && (*_reel)->main_picture()) {
 379                 auto asset = (*_reel)->main_picture()->asset ();
 380                 auto mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 381                 auto stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 382                 DCPOMATIC_ASSERT (mono || stereo);
 383                 if (mono) {
 384                         _mono_reader = mono->start_read ();
 385                         _mono_reader->set_check_hmac (false);
 386                         _stereo_reader.reset ();
 387                 } else {
 388                         _stereo_reader = stereo->start_read ();
 389                         _stereo_reader->set_check_hmac (false);
 390                         _mono_reader.reset ();
 391                 }
 392         } else {
 393                 _mono_reader.reset ();
 394                 _stereo_reader.reset ();
 395         }
 396
 397         if (audio && !audio->ignore() && (*_reel)->main_sound()) {
 398                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 399                 _sound_reader->set_check_hmac (false);
 400         } else {
 401                 _sound_reader.reset ();
 402         }
 403
 404         if ((*_reel)->atmos()) {
 405                 auto asset = (*_reel)->atmos()->asset();
 406                 _atmos_reader = asset->start_read();
 407                 _atmos_reader->set_check_hmac (false);
 408                 _atmos_metadata = AtmosMetadata (asset);
 409         } else {
 410                 _atmos_reader.reset ();
 411                 _atmos_metadata = boost::none;
 412         }
 413 }
 414
 415
 416 void
 417 DCPDecoder::seek (ContentTime t, bool accurate)
 418 {
 419         if (!_dcp_content->can_be_played ()) {
 420                 return;
 421         }
 422
 423         Decoder::seek (t, accurate);
 424
 425         _reel = _reels.begin ();
 426         _offset = 0;
 427         get_readers ();
 428
 429         int const pre_roll_seconds = 2;
 430
 431         /* Pre-roll for subs */
 432
 433         auto pre = t - ContentTime::from_seconds (pre_roll_seconds);
 434         if (pre < ContentTime()) {
 435                 pre = ContentTime ();
 436         }
 437
 438         /* Seek to pre-roll position */
 439
 440         while (
 441                 _reel != _reels.end() &&
 442                 pre >= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()))
 443                 ) {
 444
 445                 auto rd = ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()));
 446                 pre -= rd;
 447                 t -= rd;
 448                 next_reel ();
 449         }
 450
 451         /* Pass texts in the pre-roll */
 452
 453         if (_reel != _reels.end()) {
 454                 auto const vfr = _dcp_content->active_video_frame_rate (film());
 455                 for (int i = 0; i < pre_roll_seconds * vfr; ++i) {
 456                         pass_texts (pre, (*_reel)->main_picture()->asset()->size());
 457                         pre += ContentTime::from_frames (1, vfr);
 458                 }
 459         }
 460
 461         /* Seek to correct position */
 462
 463         while (
 464                 _reel != _reels.end() &&
 465                 t >= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()))
 466                 ) {
 467
 468                 t -= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()));
 469                 next_reel ();
 470         }
 471
 472         _next = t;
 473 }
 474
 475
 476 void
 477 DCPDecoder::set_decode_referenced (bool r)
 478 {
 479         _decode_referenced = r;
 480
 481         if (video) {
 482                 video->set_ignore (_dcp_content->reference_video() && !_decode_referenced);
 483         }
 484         if (audio) {
 485                 audio->set_ignore (_dcp_content->reference_audio() && !_decode_referenced);
 486         }
 487 }
 488
 489
 490 void
 491 DCPDecoder::set_forced_reduction (optional<int> reduction)
 492 {
 493         _forced_reduction = reduction;
 494 }
 495
 496
 497 string
 498 DCPDecoder::calculate_lazy_digest (shared_ptr<const DCPContent> c) const
 499 {
 500         Digester d;
 501         for (auto i: c->paths()) {
 502                 d.add (i.string());
 503         }
 504         if (_dcp_content->kdm()) {
 505                 d.add(_dcp_content->kdm()->id());
 506         }
 507         d.add (static_cast<bool>(c->cpl()));
 508         if (c->cpl()) {
 509                 d.add (c->cpl().get());
 510         }
 511         return d.get ();
 512 }
 513
 514
 515 ContentTime
 516 DCPDecoder::position () const
 517 {
 518         return ContentTime::from_frames(_offset, _dcp_content->active_video_frame_rate(film())) + _next;
 519 }
 520