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