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, shared_ptr<Log> log, bool fast)
  59         : DCP (c)
  60         , _decode_referenced (false)
  61 {
  62         if (c->video) {
  63                 video.reset (new VideoDecoder (this, c, log));
  64         }
  65         if (c->audio) {
  66                 audio.reset (new AudioDecoder (this, c->audio, log, 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, log, 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 ()
 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 ();
 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 (_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                                 shared_ptr<ImageProxy> (
 128                                         new J2KImageProxy (
 129                                                 _mono_reader->get_frame (entry_point + frame),
 130                                                 picture_asset->size(),
 131                                                 AV_PIX_FMT_XYZ12LE,
 132                                                 _forced_reduction
 133                                                 )
 134                                         ),
 135                                 _offset + frame
 136                                 );
 137                 } else {
 138                         video->emit (
 139                                 shared_ptr<ImageProxy> (
 140                                         new J2KImageProxy (
 141                                                 _stereo_reader->get_frame (entry_point + frame),
 142                                                 picture_asset->size(),
 143                                                 dcp::EYE_LEFT,
 144                                                 AV_PIX_FMT_XYZ12LE,
 145                                                 _forced_reduction
 146                                                 )
 147                                         ),
 148                                 _offset + frame
 149                                 );
 150
 151                         video->emit (
 152                                 shared_ptr<ImageProxy> (
 153                                         new J2KImageProxy (
 154                                                 _stereo_reader->get_frame (entry_point + frame),
 155                                                 picture_asset->size(),
 156                                                 dcp::EYE_RIGHT,
 157                                                 AV_PIX_FMT_XYZ12LE,
 158                                                 _forced_reduction
 159                                                 )
 160                                         ),
 161                                 _offset + frame
 162                                 );
 163                 }
 164         }
 165
 166         if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
 167                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 168                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 169                 uint8_t const * from = sf->data ();
 170
 171                 int const channels = _dcp_content->audio->stream()->channels ();
 172                 int const frames = sf->size() / (3 * channels);
 173                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 174                 float** data_data = data->data();
 175                 for (int i = 0; i < frames; ++i) {
 176                         for (int j = 0; j < channels; ++j) {
 177                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 178                                 from += 3;
 179                         }
 180                 }
 181
 182                 audio->emit (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 183         }
 184
 185         _next += ContentTime::from_frames (1, vfr);
 186
 187         if ((*_reel)->main_picture ()) {
 188                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 189                         next_reel ();
 190                         _next = ContentTime ();
 191                 }
 192         }
 193
 194         return false;
 195 }
 196
 197 void
 198 DCPDecoder::pass_texts (ContentTime next, dcp::Size size)
 199 {
 200         list<shared_ptr<TextDecoder> >::const_iterator decoder = text.begin ();
 201         if ((*_reel)->main_subtitle()) {
 202                 DCPOMATIC_ASSERT (decoder != text.end ());
 203                 pass_texts (
 204                         next, (*_reel)->main_subtitle()->asset(), _dcp_content->reference_text(TEXT_OPEN_SUBTITLE), (*_reel)->main_subtitle()->entry_point(), *decoder, size
 205                         );
 206                 ++decoder;
 207         }
 208         BOOST_FOREACH (shared_ptr<dcp::ReelClosedCaptionAsset> i, (*_reel)->closed_captions()) {
 209                 DCPOMATIC_ASSERT (decoder != text.end ());
 210                 pass_texts (
 211                         next, i->asset(), _dcp_content->reference_text(TEXT_CLOSED_CAPTION), i->entry_point(), *decoder, size
 212                         );
 213                 ++decoder;
 214         }
 215 }
 216
 217 void
 218 DCPDecoder::pass_texts (ContentTime next, shared_ptr<dcp::SubtitleAsset> asset, bool reference, int64_t entry_point, shared_ptr<TextDecoder> decoder, dcp::Size size)
 219 {
 220         double const vfr = _dcp_content->active_video_frame_rate ();
 221         /* Frame within the (played part of the) reel that is coming up next */
 222         int64_t const frame = next.frames_round (vfr);
 223
 224         if (_decode_referenced || !reference) {
 225                 list<shared_ptr<dcp::Subtitle> > subs = asset->subtitles_during (
 226                         dcp::Time (entry_point + frame, vfr, vfr),
 227                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 228                         true
 229                         );
 230
 231                 list<dcp::SubtitleString> strings;
 232
 233                 BOOST_FOREACH (shared_ptr<dcp::Subtitle> i, subs) {
 234                         shared_ptr<dcp::SubtitleString> is = dynamic_pointer_cast<dcp::SubtitleString> (i);
 235                         if (is) {
 236                                 if (!strings.empty() && (strings.back().in() != is->in() || strings.back().out() != is->out())) {
 237                                         dcp::SubtitleString b = strings.back();
 238                                         decoder->emit_plain (
 239                                                 ContentTimePeriod (
 240                                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
 241                                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
 242                                                         ),
 243                                                 strings
 244                                                 );
 245                                         strings.clear ();
 246                                 }
 247
 248                                 strings.push_back (*is);
 249                         }
 250
 251                         shared_ptr<dcp::SubtitleImage> ii = dynamic_pointer_cast<dcp::SubtitleImage> (i);
 252                         if (ii) {
 253                                 FFmpegImageProxy proxy (ii->png_image());
 254                                 shared_ptr<Image> image = proxy.image().first;
 255                                 /* set up rect with height and width */
 256                                 dcpomatic::Rect<double> rect(0, 0, image->size().width / double(size.width), image->size().height / double(size.height));
 257
 258                                 /* add in position */
 259
 260                                 switch (ii->h_align()) {
 261                                 case dcp::HALIGN_LEFT:
 262                                         rect.x += ii->h_position();
 263                                         break;
 264                                 case dcp::HALIGN_CENTER:
 265                                         rect.x += 0.5 + ii->h_position() - rect.width / 2;
 266                                         break;
 267                                 case dcp::HALIGN_RIGHT:
 268                                         rect.x += 1 - ii->h_position() - rect.width;
 269                                         break;
 270                                 }
 271
 272                                 switch (ii->v_align()) {
 273                                 case dcp::VALIGN_TOP:
 274                                         rect.y += ii->v_position();
 275                                         break;
 276                                 case dcp::VALIGN_CENTER:
 277                                         rect.y += 0.5 + ii->v_position() - rect.height / 2;
 278                                         break;
 279                                 case dcp::VALIGN_BOTTOM:
 280                                         rect.y += 1 - ii->v_position() - rect.height;
 281                                         break;
 282                                 }
 283
 284                                 decoder->emit_bitmap (
 285                                         ContentTimePeriod (
 286                                                 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->in().as_seconds ()),
 287                                                 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->out().as_seconds ())
 288                                                 ),
 289                                         image, rect
 290                                         );
 291                         }
 292                 }
 293
 294                 if (!strings.empty()) {
 295                         dcp::SubtitleString b = strings.back();
 296                         decoder->emit_plain (
 297                                 ContentTimePeriod (
 298                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
 299                                         ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
 300                                         ),
 301                                 strings
 302                                 );
 303                         strings.clear ();
 304                 }
 305         }
 306 }
 307
 308 void
 309 DCPDecoder::next_reel ()
 310 {
 311         _offset += (*_reel)->main_picture()->duration();
 312         ++_reel;
 313         get_readers ();
 314 }
 315
 316 void
 317 DCPDecoder::get_readers ()
 318 {
 319         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 320                 _mono_reader.reset ();
 321                 _stereo_reader.reset ();
 322                 _sound_reader.reset ();
 323                 return;
 324         }
 325
 326         if ((*_reel)->main_picture()) {
 327                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 328                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 329                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 330                 DCPOMATIC_ASSERT (mono || stereo);
 331                 if (mono) {
 332                         _mono_reader = mono->start_read ();
 333                         _stereo_reader.reset ();
 334                 } else {
 335                         _stereo_reader = stereo->start_read ();
 336                         _mono_reader.reset ();
 337                 }
 338         } else {
 339                 _mono_reader.reset ();
 340                 _stereo_reader.reset ();
 341         }
 342
 343         if ((*_reel)->main_sound()) {
 344                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 345         } else {
 346                 _sound_reader.reset ();
 347         }
 348 }
 349
 350 void
 351 DCPDecoder::seek (ContentTime t, bool accurate)
 352 {
 353         if (!_dcp_content->can_be_played ()) {
 354                 return;
 355         }
 356
 357         Decoder::seek (t, accurate);
 358
 359         _reel = _reels.begin ();
 360         _offset = 0;
 361         get_readers ();
 362
 363         int const pre_roll_seconds = 2;
 364
 365         /* Pre-roll for subs */
 366
 367         ContentTime pre = t - ContentTime::from_seconds (pre_roll_seconds);
 368         if (pre < ContentTime()) {
 369                 pre = ContentTime ();
 370         }
 371
 372         /* Seek to pre-roll position */
 373
 374         while (_reel != _reels.end() && pre >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 375                 ContentTime rd = ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 376                 pre -= rd;
 377                 t -= rd;
 378                 next_reel ();
 379         }
 380
 381         /* Pass texts in the pre-roll */
 382
 383         double const vfr = _dcp_content->active_video_frame_rate ();
 384         for (int i = 0; i < pre_roll_seconds * vfr; ++i) {
 385                 pass_texts (pre, (*_reel)->main_picture()->asset()->size());
 386                 pre += ContentTime::from_frames (1, vfr);
 387         }
 388
 389         /* Seek to correct position */
 390
 391         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 392                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 393                 next_reel ();
 394         }
 395
 396         _next = t;
 397 }
 398
 399 void
 400 DCPDecoder::set_decode_referenced (bool r)
 401 {
 402         _decode_referenced = r;
 403
 404         if (video) {
 405                 video->set_ignore (_dcp_content->reference_video() && !_decode_referenced);
 406         }
 407         if (audio) {
 408                 audio->set_ignore (_dcp_content->reference_audio() && !_decode_referenced);
 409         }
 410 }
 411
 412 void
 413 DCPDecoder::set_forced_reduction (optional<int> reduction)
 414 {
 415         _forced_reduction = reduction;
 416 }