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