src/lib/dcp_decoder.cc

   1 /*
   2     Copyright (C) 2014-2020 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 "atmos_decoder.h"
  22 #include "dcp_decoder.h"
  23 #include "dcp_content.h"
  24 #include "audio_content.h"
  25 #include "video_decoder.h"
  26 #include "audio_decoder.h"
  27 #include "j2k_image_proxy.h"
  28 #include "text_decoder.h"
  29 #include "ffmpeg_image_proxy.h"
  30 #include "image.h"
  31 #include "config.h"
  32 #include "digester.h"
  33 #include "frame_interval_checker.h"
  34 #include <dcp/dcp.h>
  35 #include <dcp/cpl.h>
  36 #include <dcp/reel.h>
  37 #include <dcp/mono_picture_asset.h>
  38 #include <dcp/mono_picture_asset_reader.h>
  39 #include <dcp/stereo_picture_asset.h>
  40 #include <dcp/stereo_picture_asset_reader.h>
  41 #include <dcp/reel_picture_asset.h>
  42 #include <dcp/reel_sound_asset.h>
  43 #include <dcp/reel_subtitle_asset.h>
  44 #include <dcp/reel_closed_caption_asset.h>
  45 #include <dcp/mono_picture_frame.h>
  46 #include <dcp/stereo_picture_frame.h>
  47 #include <dcp/sound_frame.h>
  48 #include <dcp/sound_asset_reader.h>
  49 #include <dcp/subtitle_image.h>
  50 #include <dcp/decrypted_kdm.h>
  51 #include <dcp/reel_atmos_asset.h>
  52 #include <boost/foreach.hpp>
  53 #include <iostream>
  54
  55 #include "i18n.h"
  56
  57 using std::list;
  58 using std::cout;
  59 using std::string;
  60 using boost::shared_ptr;
  61 using boost::dynamic_pointer_cast;
  62 using boost::optional;
  63 using namespace dcpomatic;
  64
  65 DCPDecoder::DCPDecoder (shared_ptr<const Film> film, shared_ptr<const DCPContent> c, bool fast, bool tolerant, shared_ptr<DCPDecoder> old)
  66         : DCP (c, tolerant)
  67         , Decoder (film)
  68         , _decode_referenced (false)
  69 {
  70         if (c->can_be_played()) {
  71                 if (c->video) {
  72                         video.reset (new VideoDecoder (this, c));
  73                 }
  74                 if (c->audio) {
  75                         audio.reset (new AudioDecoder (this, c->audio, fast));
  76                 }
  77                 BOOST_FOREACH (shared_ptr<TextContent> i, c->text) {
  78                         /* XXX: this time here should be the time of the first subtitle, not 0 */
  79                         text.push_back (shared_ptr<TextDecoder> (new TextDecoder (this, i, ContentTime())));
  80                 }
  81                 if (c->atmos) {
  82                         atmos.reset (new AtmosDecoder (this, c));
  83                 }
  84         }
  85
  86         /* We try to avoid re-scanning the DCP's files every time we make a new DCPDecoder; we do this
  87            by re-using the _reels list.  Before we do this we need to check that nothing too serious
  88            has changed in the DCPContent.
  89
  90            We do this by storing a digest of the important bits of the DCPContent and then checking that's
  91            the same before we re-use _reels.
  92         */
  93
  94         _lazy_digest = calculate_lazy_digest (c);
  95
  96         if (old && old->lazy_digest() == _lazy_digest) {
  97                 _reels = old->_reels;
  98         } else {
  99
 100                 list<shared_ptr<dcp::CPL> > cpl_list = cpls ();
 101
 102                 if (cpl_list.empty()) {
 103                         throw DCPError (_("No CPLs found in DCP."));
 104                 }
 105
 106                 shared_ptr<dcp::CPL> cpl;
 107                 BOOST_FOREACH (shared_ptr<dcp::CPL> i, cpl_list) {
 108                         if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
 109                                 cpl = i;
 110                         }
 111                 }
 112
 113                 if (!cpl) {
 114                         /* No CPL found; probably an old file that doesn't specify it;
 115                            just use the first one.
 116                         */
 117                         cpl = cpls().front ();
 118                 }
 119
 120                 _reels = cpl->reels ();
 121         }
 122
 123         set_decode_referenced (false);
 124
 125         _reel = _reels.begin ();
 126         _offset = 0;
 127         get_readers ();
 128 }
 129
 130
 131 bool
 132 DCPDecoder::pass ()
 133 {
 134         if (!_dcp_content->can_be_played()) {
 135                 return true;
 136         }
 137
 138         if (_reel == _reels.end()) {
 139                 if (audio) {
 140                         audio->flush ();
 141                 }
 142                 return true;
 143         }
 144
 145         double const vfr = _dcp_content->active_video_frame_rate (film());
 146
 147         /* Frame within the (played part of the) reel that is coming up next */
 148         int64_t const frame = _next.frames_round (vfr);
 149
 150         shared_ptr<dcp::PictureAsset> picture_asset = (*_reel)->main_picture()->asset();
 151         DCPOMATIC_ASSERT (picture_asset);
 152
 153         /* We must emit texts first as when we emit the video for this frame
 154            it will expect already to have the texts.
 155         */
 156         pass_texts (_next, picture_asset->size());
 157
 158         if ((_mono_reader || _stereo_reader) && (_decode_referenced || !_dcp_content->reference_video())) {
 159                 int64_t const entry_point = (*_reel)->main_picture()->entry_point().get_value_or(0);
 160                 if (_mono_reader) {
 161                         video->emit (
 162                                 film(),
 163                                 shared_ptr<ImageProxy> (
 164                                         new J2KImageProxy (
 165                                                 _mono_reader->get_frame (entry_point + frame),
 166                                                 picture_asset->size(),
 167                                                 AV_PIX_FMT_XYZ12LE,
 168                                                 _forced_reduction
 169                                                 )
 170                                         ),
 171                                 _offset + frame
 172                                 );
 173                 } else {
 174                         video->emit (
 175                                 film(),
 176                                 shared_ptr<ImageProxy> (
 177                                         new 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                                         ),
 185                                 _offset + frame
 186                                 );
 187
 188                         video->emit (
 189                                 film(),
 190                                 shared_ptr<ImageProxy> (
 191                                         new J2KImageProxy (
 192                                                 _stereo_reader->get_frame (entry_point + frame),
 193                                                 picture_asset->size(),
 194                                                 dcp::EYE_RIGHT,
 195                                                 AV_PIX_FMT_XYZ12LE,
 196                                                 _forced_reduction
 197                                                 )
 198                                         ),
 199                                 _offset + frame
 200                                 );
 201                 }
 202         }
 203
 204         if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
 205                 int64_t const entry_point = (*_reel)->main_sound()->entry_point().get_value_or(0);
 206                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 207                 uint8_t const * from = sf->data ();
 208
 209                 int const channels = _dcp_content->audio->stream()->channels ();
 210                 int const frames = sf->size() / (3 * channels);
 211                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 212                 float** data_data = data->data();
 213                 for (int i = 0; i < frames; ++i) {
 214                         for (int j = 0; j < channels; ++j) {
 215                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 216                                 from += 3;
 217                         }
 218                 }
 219
 220                 audio->emit (film(), _dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 221         }
 222
 223         if (_atmos_reader) {
 224                 DCPOMATIC_ASSERT (_atmos_metadata);
 225                 atmos->emit (film(), _atmos_reader->get_frame(frame), frame, *_atmos_metadata);
 226         }
 227
 228         _next += ContentTime::from_frames (1, vfr);
 229
 230         if ((*_reel)->main_picture ()) {
 231                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 232                         next_reel ();
 233                         _next = ContentTime ();
 234                 }
 235         }
 236
 237         return false;
 238 }
 239
 240 void
 241 DCPDecoder::pass_texts (ContentTime next, dcp::Size size)
 242 {
 243         list<shared_ptr<TextDecoder> >::const_iterator decoder = text.begin ();
 244         if (decoder == text.end()) {
 245                 /* It's possible that there is now a main subtitle but no TextDecoders, for example if
 246                    the CPL has just changed but the TextContent's texts have not been recreated yet.
 247                 */
 248                 return;
 249         }
 250
 251         if ((*_reel)->main_subtitle()) {
 252                 pass_texts (
 253                         next,
 254                         (*_reel)->main_subtitle()->asset(),
 255                         _dcp_content->reference_text(TEXT_OPEN_SUBTITLE),
 256                         (*_reel)->main_subtitle()->entry_point().get_value_or(0),
 257                         *decoder,
 258                         size
 259                         );
 260                 ++decoder;
 261         }
 262
 263         BOOST_FOREACH (shared_ptr<dcp::ReelClosedCaptionAsset> i, (*_reel)->closed_captions()) {
 264                 pass_texts (
 265                         next, i->asset(), _dcp_content->reference_text(TEXT_CLOSED_CAPTION), i->entry_point().get_value_or(0), *decoder, size
 266                         );
 267                 ++decoder;
 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         double const vfr = _dcp_content->active_video_frame_rate (film());
 277         /* Frame within the (played part of the) reel that is coming up next */
 278         int64_t const frame = next.frames_round (vfr);
 279
 280         if (_decode_referenced || !reference) {
 281                 list<shared_ptr<dcp::Subtitle> > 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                 BOOST_FOREACH (shared_ptr<dcp::Subtitle> i, subs) {
 290                         shared_ptr<dcp::SubtitleString> is = dynamic_pointer_cast<dcp::SubtitleString> (i);
 291                         if (is) {
 292                                 if (!strings.empty() && (strings.back().in() != is->in() || strings.back().out() != is->out())) {
 293                                         dcp::SubtitleString 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                         shared_ptr<dcp::SubtitleImage> ii = dynamic_pointer_cast<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                         dcp::SubtitleString 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 void
 340 DCPDecoder::next_reel ()
 341 {
 342         _offset += (*_reel)->main_picture()->actual_duration();
 343         ++_reel;
 344         get_readers ();
 345 }
 346
 347 void
 348 DCPDecoder::get_readers ()
 349 {
 350         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 351                 _mono_reader.reset ();
 352                 _stereo_reader.reset ();
 353                 _sound_reader.reset ();
 354                 _atmos_reader.reset ();
 355                 return;
 356         }
 357
 358         if ((*_reel)->main_picture()) {
 359                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 360                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 361                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 362                 DCPOMATIC_ASSERT (mono || stereo);
 363                 if (mono) {
 364                         _mono_reader = mono->start_read ();
 365                         _stereo_reader.reset ();
 366                 } else {
 367                         _stereo_reader = stereo->start_read ();
 368                         _mono_reader.reset ();
 369                 }
 370         } else {
 371                 _mono_reader.reset ();
 372                 _stereo_reader.reset ();
 373         }
 374
 375         if ((*_reel)->main_sound()) {
 376                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 377         } else {
 378                 _sound_reader.reset ();
 379         }
 380
 381         if ((*_reel)->atmos()) {
 382                 shared_ptr<dcp::AtmosAsset> asset = (*_reel)->atmos()->asset();
 383                 _atmos_reader = asset->start_read();
 384                 _atmos_metadata = AtmosMetadata (asset);
 385         } else {
 386                 _atmos_reader.reset ();
 387                 _atmos_metadata = boost::none;
 388         }
 389 }
 390
 391 void
 392 DCPDecoder::seek (ContentTime t, bool accurate)
 393 {
 394         if (!_dcp_content->can_be_played ()) {
 395                 return;
 396         }
 397
 398         Decoder::seek (t, accurate);
 399
 400         _reel = _reels.begin ();
 401         _offset = 0;
 402         get_readers ();
 403
 404         int const pre_roll_seconds = 2;
 405
 406         /* Pre-roll for subs */
 407
 408         ContentTime pre = t - ContentTime::from_seconds (pre_roll_seconds);
 409         if (pre < ContentTime()) {
 410                 pre = ContentTime ();
 411         }
 412
 413         /* Seek to pre-roll position */
 414
 415         while (
 416                 _reel != _reels.end() &&
 417                 pre >= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()))
 418                 ) {
 419
 420                 ContentTime rd = ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()));
 421                 pre -= rd;
 422                 t -= rd;
 423                 next_reel ();
 424         }
 425
 426         /* Pass texts in the pre-roll */
 427
 428         double const vfr = _dcp_content->active_video_frame_rate (film());
 429         for (int i = 0; i < pre_roll_seconds * vfr; ++i) {
 430                 pass_texts (pre, (*_reel)->main_picture()->asset()->size());
 431                 pre += ContentTime::from_frames (1, vfr);
 432         }
 433
 434         /* Seek to correct position */
 435
 436         while (
 437                 _reel != _reels.end() &&
 438                 t >= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()))
 439                 ) {
 440
 441                 t -= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()));
 442                 next_reel ();
 443         }
 444
 445         _next = t;
 446 }
 447
 448 void
 449 DCPDecoder::set_decode_referenced (bool r)
 450 {
 451         _decode_referenced = r;
 452
 453         if (video) {
 454                 video->set_ignore (_dcp_content->reference_video() && !_decode_referenced);
 455         }
 456         if (audio) {
 457                 audio->set_ignore (_dcp_content->reference_audio() && !_decode_referenced);
 458         }
 459 }
 460
 461 void
 462 DCPDecoder::set_forced_reduction (optional<int> reduction)
 463 {
 464         _forced_reduction = reduction;
 465 }
 466
 467 string
 468 DCPDecoder::calculate_lazy_digest (shared_ptr<const DCPContent> c) const
 469 {
 470         Digester d;
 471         BOOST_FOREACH (boost::filesystem::path i, c->paths()) {
 472                 d.add (i.string());
 473         }
 474         if (_dcp_content->kdm()) {
 475                 d.add(_dcp_content->kdm()->id());
 476         }
 477         d.add (static_cast<bool>(c->cpl()));
 478         if (c->cpl()) {
 479                 d.add (c->cpl().get());
 480         }
 481         return d.get ();
 482 }
 483
 484 ContentTime
 485 DCPDecoder::position () const
 486 {
 487         return ContentTime::from_frames(_offset, _dcp_content->active_video_frame_rate(film())) + _next;
 488 }