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