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_content (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                         bind (&DCPDecoder::image_subtitles_during, this, _1, _2),
  65                         bind (&DCPDecoder::text_subtitles_during, this, _1, _2)
  66                         )
  67                 );
  68
  69         dcp::DCP dcp (c->directory ());
  70         dcp.read (false, 0, true);
  71         if (c->kdm ()) {
  72                 dcp.add (dcp::DecryptedKDM (c->kdm().get (), Config::instance()->decryption_chain()->key().get ()));
  73         }
  74         DCPOMATIC_ASSERT (dcp.cpls().size() == 1);
  75         _reels = dcp.cpls().front()->reels ();
  76
  77         _reel = _reels.begin ();
  78         _offset = 0;
  79         get_readers ();
  80 }
  81
  82 bool
  83 DCPDecoder::pass (PassReason reason, bool)
  84 {
  85         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  86                 return true;
  87         }
  88
  89         double const vfr = _dcp_content->active_video_frame_rate ();
  90
  91         /* Frame within the (played part of the) reel that is coming up next */
  92         int64_t const frame = _next.frames_round (vfr);
  93
  94         if ((_mono_reader || _stereo_reader) && reason != PASS_REASON_SUBTITLE && (_decode_referenced || !_dcp_content->reference_video())) {
  95                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
  96                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
  97                 if (_mono_reader) {
  98                         video->give (shared_ptr<ImageProxy> (new J2KImageProxy (_mono_reader->get_frame (entry_point + frame), asset->size())), _offset + frame);
  99                 } else {
 100                         video->give (
 101                                 shared_ptr<ImageProxy> (new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT)),
 102                                 _offset + frame
 103                                 );
 104
 105                         video->give (
 106                                 shared_ptr<ImageProxy> (new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT)),
 107                                 _offset + frame
 108                                 );
 109                 }
 110         }
 111
 112         if (_sound_reader && reason != PASS_REASON_SUBTITLE && (_decode_referenced || !_dcp_content->reference_audio())) {
 113                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 114                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 115                 uint8_t const * from = sf->data ();
 116
 117                 int const channels = _dcp_content->audio->stream()->channels ();
 118                 int const frames = sf->size() / (3 * channels);
 119                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 120                 float** data_data = data->data();
 121                 for (int i = 0; i < frames; ++i) {
 122                         for (int j = 0; j < channels; ++j) {
 123                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 124                                 from += 3;
 125                         }
 126                 }
 127
 128                 audio->give (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 129         }
 130
 131         if ((*_reel)->main_subtitle() && (_decode_referenced || !_dcp_content->reference_subtitle())) {
 132                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 133                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 134                         dcp::Time (entry_point + frame, vfr, vfr),
 135                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 136                         true
 137                         );
 138
 139                 if (!subs.empty ()) {
 140                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 141                         subtitle->give_text (
 142                                 ContentTimePeriod (
 143                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 144                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 145                                         ),
 146                                 subs
 147                                 );
 148                 }
 149         }
 150
 151         _next += ContentTime::from_frames (1, vfr);
 152
 153         if ((*_reel)->main_picture ()) {
 154                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 155                         next_reel ();
 156                         _next = ContentTime ();
 157                 }
 158         }
 159
 160         return false;
 161 }
 162
 163 void
 164 DCPDecoder::next_reel ()
 165 {
 166         _offset += (*_reel)->main_picture()->duration();
 167         ++_reel;
 168         get_readers ();
 169 }
 170
 171 void
 172 DCPDecoder::get_readers ()
 173 {
 174         if (_reel == _reels.end()) {
 175                 _mono_reader.reset ();
 176                 _stereo_reader.reset ();
 177                 _sound_reader.reset ();
 178                 return;
 179         }
 180
 181         if ((*_reel)->main_picture()) {
 182                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 183                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 184                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 185                 DCPOMATIC_ASSERT (mono || stereo);
 186                 if (mono) {
 187                         _mono_reader = mono->start_read ();
 188                         _stereo_reader.reset ();
 189                 } else {
 190                         _stereo_reader = stereo->start_read ();
 191                         _mono_reader.reset ();
 192                 }
 193         } else {
 194                 _mono_reader.reset ();
 195                 _stereo_reader.reset ();
 196         }
 197
 198         if ((*_reel)->main_sound()) {
 199                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 200         } else {
 201                 _sound_reader.reset ();
 202         }
 203 }
 204
 205 void
 206 DCPDecoder::seek (ContentTime t, bool accurate)
 207 {
 208         video->seek (t, accurate);
 209         audio->seek (t, accurate);
 210         subtitle->seek (t, accurate);
 211
 212         _offset = 0;
 213         _reel = _reels.begin ();
 214         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 215                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 216                 next_reel ();
 217         }
 218
 219         _next = t;
 220 }
 221
 222
 223 list<ContentTimePeriod>
 224 DCPDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 225 {
 226         return list<ContentTimePeriod> ();
 227 }
 228
 229 list<ContentTimePeriod>
 230 DCPDecoder::text_subtitles_during (ContentTimePeriod period, bool starting) const
 231 {
 232         /* XXX: inefficient */
 233
 234         list<ContentTimePeriod> ctp;
 235         double const vfr = _dcp_content->active_video_frame_rate ();
 236
 237         BOOST_FOREACH (shared_ptr<dcp::Reel> r, _reels) {
 238                 if (!r->main_subtitle ()) {
 239                         continue;
 240                 }
 241
 242                 int64_t const entry_point = r->main_subtitle()->entry_point ();
 243
 244                 list<dcp::SubtitleString> subs = r->main_subtitle()->asset()->subtitles_during (
 245                         dcp::Time (period.from.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 246                         dcp::Time (period.to.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 247                         starting
 248                         );
 249
 250                 BOOST_FOREACH (dcp::SubtitleString const & s, subs) {
 251                         ctp.push_back (
 252                                 ContentTimePeriod (
 253                                         ContentTime::from_seconds (s.in().as_seconds ()),
 254                                         ContentTime::from_seconds (s.out().as_seconds ())
 255                                         )
 256                                 );
 257                 }
 258         }
 259
 260         return ctp;
 261 }
 262
 263 void
 264 DCPDecoder::set_decode_referenced ()
 265 {
 266         _decode_referenced = true;
 267 }