src/lib/dcp_decoder.cc

   1 /*
   2     Copyright (C) 2014-2016 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 "subtitle_decoder.h"
  28 #include "image.h"
  29 #include "config.h"
  30 #include <dcp/dcp.h>
  31 #include <dcp/decrypted_kdm.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/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 using std::list;
  49 using std::cout;
  50 using boost::shared_ptr;
  51 using boost::dynamic_pointer_cast;
  52
  53 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, shared_ptr<Log> log)
  54         : DCP (c)
  55         , _decode_referenced (false)
  56 {
  57         video.reset (new VideoDecoder (this, c, log));
  58         audio.reset (new AudioDecoder (this, c->audio, log));
  59
  60         subtitle.reset (
  61                 new SubtitleDecoder (
  62                         this,
  63                         c->subtitle,
  64                         log,
  65                         bind (&DCPDecoder::image_subtitles_during, this, _1, _2),
  66                         bind (&DCPDecoder::text_subtitles_during, this, _1, _2)
  67                         )
  68                 );
  69
  70         shared_ptr<dcp::CPL> cpl;
  71         BOOST_FOREACH (shared_ptr<dcp::CPL> i, cpls ()) {
  72                 if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
  73                         cpl = i;
  74                 }
  75         }
  76
  77         if (!cpl) {
  78                 /* No CPL found; probably an old file that doesn't specify it;
  79                    just use the first one.
  80                 */
  81                 cpl = cpls().front ();
  82         }
  83
  84         _reels = cpl->reels ();
  85
  86         _reel = _reels.begin ();
  87         _offset = 0;
  88         get_readers ();
  89 }
  90
  91 bool
  92 DCPDecoder::pass (PassReason reason, bool)
  93 {
  94         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  95                 return true;
  96         }
  97
  98         double const vfr = _dcp_content->active_video_frame_rate ();
  99
 100         /* Frame within the (played part of the) reel that is coming up next */
 101         int64_t const frame = _next.frames_round (vfr);
 102
 103         if ((_mono_reader || _stereo_reader) && reason != PASS_REASON_SUBTITLE && (_decode_referenced || !_dcp_content->reference_video())) {
 104                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 105                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
 106                 if (_mono_reader) {
 107                         video->give (
 108                                 shared_ptr<ImageProxy> (
 109                                         new J2KImageProxy (_mono_reader->get_frame (entry_point + frame), asset->size(), AV_PIX_FMT_XYZ12LE)
 110                                         ),
 111                                 _offset + frame
 112                                 );
 113                 } else {
 114                         video->give (
 115                                 shared_ptr<ImageProxy> (
 116                                         new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT, AV_PIX_FMT_XYZ12LE)),
 117                                 _offset + frame
 118                                 );
 119
 120                         video->give (
 121                                 shared_ptr<ImageProxy> (
 122                                         new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT, AV_PIX_FMT_XYZ12LE)),
 123                                 _offset + frame
 124                                 );
 125                 }
 126         }
 127
 128         if (_sound_reader && reason != PASS_REASON_SUBTITLE && (_decode_referenced || !_dcp_content->reference_audio())) {
 129                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 130                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 131                 uint8_t const * from = sf->data ();
 132
 133                 int const channels = _dcp_content->audio->stream()->channels ();
 134                 int const frames = sf->size() / (3 * channels);
 135                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 136                 float** data_data = data->data();
 137                 for (int i = 0; i < frames; ++i) {
 138                         for (int j = 0; j < channels; ++j) {
 139                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 140                                 from += 3;
 141                         }
 142                 }
 143
 144                 audio->give (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 145         }
 146
 147         if ((*_reel)->main_subtitle() && (_decode_referenced || !_dcp_content->reference_subtitle())) {
 148                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 149                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 150                         dcp::Time (entry_point + frame, vfr, vfr),
 151                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 152                         true
 153                         );
 154
 155                 if (!subs.empty ()) {
 156                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 157                         subtitle->give_text (
 158                                 ContentTimePeriod (
 159                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 160                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 161                                         ),
 162                                 subs
 163                                 );
 164                 }
 165         }
 166
 167         video->set_position (_next);
 168         audio->set_position (_next);
 169         subtitle->set_position (_next);
 170         _next += ContentTime::from_frames (1, vfr);
 171
 172         if ((*_reel)->main_picture ()) {
 173                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 174                         next_reel ();
 175                         _next = ContentTime ();
 176                 }
 177         }
 178
 179         return false;
 180 }
 181
 182 void
 183 DCPDecoder::next_reel ()
 184 {
 185         _offset += (*_reel)->main_picture()->duration();
 186         ++_reel;
 187         get_readers ();
 188 }
 189
 190 void
 191 DCPDecoder::get_readers ()
 192 {
 193         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 194                 _mono_reader.reset ();
 195                 _stereo_reader.reset ();
 196                 _sound_reader.reset ();
 197                 return;
 198         }
 199
 200         if ((*_reel)->main_picture()) {
 201                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 202                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 203                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 204                 DCPOMATIC_ASSERT (mono || stereo);
 205                 if (mono) {
 206                         _mono_reader = mono->start_read ();
 207                         _stereo_reader.reset ();
 208                 } else {
 209                         _stereo_reader = stereo->start_read ();
 210                         _mono_reader.reset ();
 211                 }
 212         } else {
 213                 _mono_reader.reset ();
 214                 _stereo_reader.reset ();
 215         }
 216
 217         if ((*_reel)->main_sound()) {
 218                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 219         } else {
 220                 _sound_reader.reset ();
 221         }
 222 }
 223
 224 void
 225 DCPDecoder::seek (ContentTime t, bool accurate)
 226 {
 227         video->seek (t, accurate);
 228         audio->seek (t, accurate);
 229         subtitle->seek (t, accurate);
 230
 231         _reel = _reels.begin ();
 232         _offset = 0;
 233         get_readers ();
 234
 235         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 236                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 237                 next_reel ();
 238         }
 239
 240         _next = t;
 241 }
 242
 243
 244 list<ContentTimePeriod>
 245 DCPDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 246 {
 247         return list<ContentTimePeriod> ();
 248 }
 249
 250 list<ContentTimePeriod>
 251 DCPDecoder::text_subtitles_during (ContentTimePeriod period, bool starting) const
 252 {
 253         /* XXX: inefficient */
 254
 255         list<ContentTimePeriod> ctp;
 256         double const vfr = _dcp_content->active_video_frame_rate ();
 257
 258         int offset = 0;
 259
 260         BOOST_FOREACH (shared_ptr<dcp::Reel> r, _reels) {
 261                 if (!r->main_subtitle ()) {
 262                         offset += r->main_picture()->duration();
 263                         continue;
 264                 }
 265
 266                 int64_t const entry_point = r->main_subtitle()->entry_point ();
 267
 268                 list<dcp::SubtitleString> subs = r->main_subtitle()->asset()->subtitles_during (
 269                         dcp::Time (period.from.seconds(), 1000) - dcp::Time (offset - entry_point, vfr, vfr),
 270                         dcp::Time (period.to.seconds(), 1000) - dcp::Time (offset - entry_point, vfr, vfr),
 271                         starting
 272                         );
 273
 274                 BOOST_FOREACH (dcp::SubtitleString const & s, subs) {
 275                         ctp.push_back (
 276                                 ContentTimePeriod (
 277                                         ContentTime::from_seconds (s.in().as_seconds ()) + ContentTime::from_frames (offset - entry_point, vfr),
 278                                         ContentTime::from_seconds (s.out().as_seconds ()) + ContentTime::from_frames (offset - entry_point, vfr)
 279                                         )
 280                                 );
 281                 }
 282
 283                 offset += r->main_subtitle()->duration();
 284         }
 285
 286         return ctp;
 287 }
 288
 289 void
 290 DCPDecoder::set_decode_referenced ()
 291 {
 292         _decode_referenced = true;
 293 }