src/lib/dcp_decoder.cc

   1 /*
   2     Copyright (C) 2014-2018 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 "dcp_decoder.h"
  22 #include "dcp_content.h"
  23 #include "audio_content.h"
  24 #include "video_decoder.h"
  25 #include "audio_decoder.h"
  26 #include "j2k_image_proxy.h"
  27 #include "text_decoder.h"
  28 #include "ffmpeg_image_proxy.h"
  29 #include "image.h"
  30 #include "config.h"
  31 #include <dcp/dcp.h>
  32 #include <dcp/cpl.h>
  33 #include <dcp/reel.h>
  34 #include <dcp/mono_picture_asset.h>
  35 #include <dcp/mono_picture_asset_reader.h>
  36 #include <dcp/stereo_picture_asset.h>
  37 #include <dcp/stereo_picture_asset_reader.h>
  38 #include <dcp/reel_picture_asset.h>
  39 #include <dcp/reel_sound_asset.h>
  40 #include <dcp/reel_subtitle_asset.h>
  41 #include <dcp/reel_closed_caption_asset.h>
  42 #include <dcp/mono_picture_frame.h>
  43 #include <dcp/stereo_picture_frame.h>
  44 #include <dcp/sound_frame.h>
  45 #include <dcp/sound_asset_reader.h>
  46 #include <dcp/subtitle_image.h>
  47 #include <boost/foreach.hpp>
  48 #include <iostream>
  49
  50 #include "i18n.h"
  51
  52 using std::list;
  53 using std::cout;
  54 using boost::shared_ptr;
  55 using boost::dynamic_pointer_cast;
  56 using boost::optional;
  57
  58 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, bool fast)
  59         : DCP (c)
  60         , _decode_referenced (false)
  61 {
  62         if (c->video) {
  63                 video.reset (new VideoDecoder (this, c));
  64         }
  65         if (c->audio) {
  66                 audio.reset (new AudioDecoder (this, c->audio, fast));
  67         }
  68         BOOST_FOREACH (shared_ptr<TextContent> i, c->text) {
  69                 /* XXX: this time here should be the time of the first subtitle, not 0 */
  70                 text.push_back (shared_ptr<TextDecoder> (new TextDecoder (this, i, ContentTime())));
  71         }
  72
  73         list<shared_ptr<dcp::CPL> > cpl_list = cpls ();
  74
  75         if (cpl_list.empty()) {
  76                 throw DCPError (_("No CPLs found in DCP."));
  77         }
  78
  79         shared_ptr<dcp::CPL> cpl;
  80         BOOST_FOREACH (shared_ptr<dcp::CPL> i, cpl_list) {
  81                 if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
  82                         cpl = i;
  83                 }
  84         }
  85
  86         if (!cpl) {
  87                 /* No CPL found; probably an old file that doesn't specify it;
  88                    just use the first one.
  89                 */
  90                 cpl = cpls().front ();
  91         }
  92
  93         set_decode_referenced (false);
  94
  95         _reels = cpl->reels ();
  96
  97         _reel = _reels.begin ();
  98         _offset = 0;
  99         get_readers ();
 100 }
 101
 102
 103 bool
 104 DCPDecoder::pass (shared_ptr<const Film> film)
 105 {
 106         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
 107                 return true;
 108         }
 109
 110         double const vfr = _dcp_content->active_video_frame_rate (film);
 111
 112         /* Frame within the (played part of the) reel that is coming up next */
 113         int64_t const frame = _next.frames_round (vfr);
 114
 115         shared_ptr<dcp::PictureAsset> picture_asset = (*_reel)->main_picture()->asset();
 116         DCPOMATIC_ASSERT (picture_asset);
 117
 118         /* We must emit texts first as when we emit the video for this frame
 119            it will expect already to have the texts.
 120         */
 121         pass_texts (film, _next, picture_asset->size());
 122
 123         if ((_mono_reader || _stereo_reader) && (_decode_referenced || !_dcp_content->reference_video())) {
 124                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
 125                 if (_mono_reader) {
 126                         video->emit (
 127                                 film,
 128                                 shared_ptr<ImageProxy> (
 129                                         new J2KImageProxy (
 130                                                 _mono_reader->get_frame (entry_point + frame),
 131                                                 picture_asset->size(),
 132                                                 AV_PIX_FMT_XYZ12LE,
 133                                                 _forced_reduction
 134                                                 )
 135                                         ),
 136                                 _offset + frame
 137                                 );
 138                 } else {
 139                         video->emit (
 140                                 film,
 141                                 shared_ptr<ImageProxy> (
 142                                         new J2KImageProxy (
 143                                                 _stereo_reader->get_frame (entry_point + frame),
 144                                                 picture_asset->size(),
 145                                                 dcp::EYE_LEFT,
 146                                                 AV_PIX_FMT_XYZ12LE,
 147                                                 _forced_reduction
 148                                                 )
 149                                         ),
 150                                 _offset + frame
 151                                 );
 152
 153                         video->emit (
 154                                 film,
 155                                 shared_ptr<ImageProxy> (
 156                                         new J2KImageProxy (
 157                                                 _stereo_reader->get_frame (entry_point + frame),
 158                                                 picture_asset->size(),
 159                                                 dcp::EYE_RIGHT,
 160                                                 AV_PIX_FMT_XYZ12LE,
 161                                                 _forced_reduction
 162                                                 )
 163                                         ),
 164                                 _offset + frame
 165                                 );
 166                 }
 167         }
 168
 169         if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
 170                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 171                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 172                 uint8_t const * from = sf->data ();
 173
 174                 int const channels = _dcp_content->audio->stream()->channels ();
 175                 int const frames = sf->size() / (3 * channels);
 176                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 177                 float** data_data = data->data();
 178                 for (int i = 0; i < frames; ++i) {
 179                         for (int j = 0; j < channels; ++j) {
 180                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 181                                 from += 3;
 182                         }
 183                 }
 184
 185                 audio->emit (film, _dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 186         }
 187
 188         _next += ContentTime::from_frames (1, vfr);
 189
 190         if ((*_reel)->main_picture ()) {
 191                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 192                         next_reel ();
 193                         _next = ContentTime ();
 194                 }
 195         }
 196
 197         return false;
 198 }
 199
 200 void
 201 DCPDecoder::pass_texts (shared_ptr<const Film> film, ContentTime next, dcp::Size size)
 202 {
 203         list<shared_ptr<TextDecoder> >::const_iterator decoder = text.begin ();
 204         if ((*_reel)->main_subtitle()) {
 205                 DCPOMATIC_ASSERT (decoder != text.end ());
 206                 pass_texts (
 207                         film,
 208                         next,
 209                         (*_reel)->main_subtitle()->asset(),
 210                         _dcp_content->reference_text(TEXT_OPEN_SUBTITLE),
 211                         (*_reel)->main_subtitle()->entry_point(),
 212                         *decoder,
 213                         size
 214                         );
 215                 ++decoder;
 216         }
 217         BOOST_FOREACH (shared_ptr<dcp::ReelClosedCaptionAsset> i, (*_reel)->closed_captions()) {
 218                 DCPOMATIC_ASSERT (decoder != text.end ());
 219                 pass_texts (
 220                         film, next, i->asset(), _dcp_content->reference_text(TEXT_CLOSED_CAPTION), i->entry_point(), *decoder, size
 221                         );
 222                 ++decoder;
 223         }
 224 }
 225
 226 void
 227 DCPDecoder::pass_texts (
 228         shared_ptr<const Film> film, ContentTime next, shared_ptr<dcp::SubtitleAsset> asset, bool reference, int64_t entry_point, shared_ptr<TextDecoder> decoder, dcp::Size size
 229         )
 230 {
 231         double const vfr = _dcp_content->active_video_frame_rate (film);
 232         /* Frame within the (played part of the) reel that is coming up next */
 233         int64_t const frame = next.frames_round (vfr);
 234
 235         if (_decode_referenced || !reference) {
 236                 list<shared_ptr<dcp::Subtitle> > subs = asset->subtitles_during (
 237                         dcp::Time (entry_point + frame, vfr, vfr),
 238                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 239                         true
 240                         );
 241
 242                 list<dcp::SubtitleString> strings;
 243
 244                 BOOST_FOREACH (shared_ptr<dcp::Subtitle> i, subs) {
 245                         shared_ptr<dcp::SubtitleString> is = dynamic_pointer_cast<dcp::SubtitleString> (i);
 246                         if (is) {
 247                                 if (!strings.empty() && (strings.back().in() != is->in() || strings.back().out() != is->out())) {
 248                                         dcp::SubtitleString b = strings.back();
 249                                         decoder->emit_plain (
 250                                                 ContentTimePeriod (
 251                                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
 252                                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
 253                                                         ),
 254                                                 strings
 255                                                 );
 256                                         strings.clear ();
 257                                 }
 258
 259                                 strings.push_back (*is);
 260                         }
 261
 262                         shared_ptr<dcp::SubtitleImage> ii = dynamic_pointer_cast<dcp::SubtitleImage> (i);
 263                         if (ii) {
 264                                 FFmpegImageProxy proxy (ii->png_image());
 265                                 shared_ptr<Image> image = proxy.image().first;
 266                                 /* set up rect with height and width */
 267                                 dcpomatic::Rect<double> rect(0, 0, image->size().width / double(size.width), image->size().height / double(size.height));
 268
 269                                 /* add in position */
 270
 271                                 switch (ii->h_align()) {
 272                                 case dcp::HALIGN_LEFT:
 273                                         rect.x += ii->h_position();
 274                                         break;
 275                                 case dcp::HALIGN_CENTER:
 276                                         rect.x += 0.5 + ii->h_position() - rect.width / 2;
 277                                         break;
 278                                 case dcp::HALIGN_RIGHT:
 279                                         rect.x += 1 - ii->h_position() - rect.width;
 280                                         break;
 281                                 }
 282
 283                                 switch (ii->v_align()) {
 284                                 case dcp::VALIGN_TOP:
 285                                         rect.y += ii->v_position();
 286                                         break;
 287                                 case dcp::VALIGN_CENTER:
 288                                         rect.y += 0.5 + ii->v_position() - rect.height / 2;
 289                                         break;
 290                                 case dcp::VALIGN_BOTTOM:
 291                                         rect.y += 1 - ii->v_position() - rect.height;
 292                                         break;
 293                                 }
 294
 295                                 decoder->emit_bitmap (
 296                                         ContentTimePeriod (
 297                                                 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->in().as_seconds ()),
 298                                                 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->out().as_seconds ())
 299                                                 ),
 300                                         image, rect
 301                                         );
 302                         }
 303                 }
 304
 305                 if (!strings.empty()) {
 306                         dcp::SubtitleString b = strings.back();
 307                         decoder->emit_plain (
 308                                 ContentTimePeriod (
 309                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
 310                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
 311                                         ),
 312                                 strings
 313                                 );
 314                         strings.clear ();
 315                 }
 316         }
 317 }
 318
 319 void
 320 DCPDecoder::next_reel ()
 321 {
 322         _offset += (*_reel)->main_picture()->duration();
 323         ++_reel;
 324         get_readers ();
 325 }
 326
 327 void
 328 DCPDecoder::get_readers ()
 329 {
 330         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 331                 _mono_reader.reset ();
 332                 _stereo_reader.reset ();
 333                 _sound_reader.reset ();
 334                 return;
 335         }
 336
 337         if ((*_reel)->main_picture()) {
 338                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 339                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 340                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 341                 DCPOMATIC_ASSERT (mono || stereo);
 342                 if (mono) {
 343                         _mono_reader = mono->start_read ();
 344                         _stereo_reader.reset ();
 345                 } else {
 346                         _stereo_reader = stereo->start_read ();
 347                         _mono_reader.reset ();
 348                 }
 349         } else {
 350                 _mono_reader.reset ();
 351                 _stereo_reader.reset ();
 352         }
 353
 354         if ((*_reel)->main_sound()) {
 355                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 356         } else {
 357                 _sound_reader.reset ();
 358         }
 359 }
 360
 361 void
 362 DCPDecoder::seek (shared_ptr<const Film> film, ContentTime t, bool accurate)
 363 {
 364         if (!_dcp_content->can_be_played ()) {
 365                 return;
 366         }
 367
 368         Decoder::seek (film, t, accurate);
 369
 370         _reel = _reels.begin ();
 371         _offset = 0;
 372         get_readers ();
 373
 374         int const pre_roll_seconds = 2;
 375
 376         /* Pre-roll for subs */
 377
 378         ContentTime pre = t - ContentTime::from_seconds (pre_roll_seconds);
 379         if (pre < ContentTime()) {
 380                 pre = ContentTime ();
 381         }
 382
 383         /* Seek to pre-roll position */
 384
 385         while (_reel != _reels.end() && pre >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate(film))) {
 386                 ContentTime rd = ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate(film));
 387                 pre -= rd;
 388                 t -= rd;
 389                 next_reel ();
 390         }
 391
 392         /* Pass texts in the pre-roll */
 393
 394         double const vfr = _dcp_content->active_video_frame_rate (film);
 395         for (int i = 0; i < pre_roll_seconds * vfr; ++i) {
 396                 pass_texts (film, pre, (*_reel)->main_picture()->asset()->size());
 397                 pre += ContentTime::from_frames (1, vfr);
 398         }
 399
 400         /* Seek to correct position */
 401
 402         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate(film))) {
 403                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate(film));
 404                 next_reel ();
 405         }
 406
 407         _next = t;
 408 }
 409
 410 void
 411 DCPDecoder::set_decode_referenced (bool r)
 412 {
 413         _decode_referenced = r;
 414
 415         if (video) {
 416                 video->set_ignore (_dcp_content->reference_video() && !_decode_referenced);
 417         }
 418         if (audio) {
 419                 audio->set_ignore (_dcp_content->reference_audio() && !_decode_referenced);
 420         }
 421 }
 422
 423 void
 424 DCPDecoder::set_forced_reduction (optional<int> reduction)
 425 {
 426         _forced_reduction = reduction;
 427 }