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 (
  99                                 shared_ptr<ImageProxy> (
 100                                         new J2KImageProxy (_mono_reader->get_frame (entry_point + frame), asset->size(), AV_PIX_FMT_XYZ12LE)
 101                                         ),
 102                                 _offset + frame
 103                                 );
 104                 } else {
 105                         video->give (
 106                                 shared_ptr<ImageProxy> (
 107                                         new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT, AV_PIX_FMT_XYZ12LE)),
 108                                 _offset + frame
 109                                 );
 110
 111                         video->give (
 112                                 shared_ptr<ImageProxy> (
 113                                         new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT, AV_PIX_FMT_XYZ12LE)),
 114                                 _offset + frame
 115                                 );
 116                 }
 117         }
 118
 119         if (_sound_reader && reason != PASS_REASON_SUBTITLE && (_decode_referenced || !_dcp_content->reference_audio())) {
 120                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 121                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 122                 uint8_t const * from = sf->data ();
 123
 124                 int const channels = _dcp_content->audio->stream()->channels ();
 125                 int const frames = sf->size() / (3 * channels);
 126                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 127                 float** data_data = data->data();
 128                 for (int i = 0; i < frames; ++i) {
 129                         for (int j = 0; j < channels; ++j) {
 130                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 131                                 from += 3;
 132                         }
 133                 }
 134
 135                 audio->give (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 136         }
 137
 138         if ((*_reel)->main_subtitle() && (_decode_referenced || !_dcp_content->reference_subtitle())) {
 139                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 140                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 141                         dcp::Time (entry_point + frame, vfr, vfr),
 142                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 143                         true
 144                         );
 145
 146                 if (!subs.empty ()) {
 147                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 148                         subtitle->give_text (
 149                                 ContentTimePeriod (
 150                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 151                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 152                                         ),
 153                                 subs
 154                                 );
 155                 }
 156         }
 157
 158         _next += ContentTime::from_frames (1, vfr);
 159
 160         if ((*_reel)->main_picture ()) {
 161                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 162                         next_reel ();
 163                         _next = ContentTime ();
 164                 }
 165         }
 166
 167         return false;
 168 }
 169
 170 void
 171 DCPDecoder::next_reel ()
 172 {
 173         _offset += (*_reel)->main_picture()->duration();
 174         ++_reel;
 175         get_readers ();
 176 }
 177
 178 void
 179 DCPDecoder::get_readers ()
 180 {
 181         if (_reel == _reels.end()) {
 182                 _mono_reader.reset ();
 183                 _stereo_reader.reset ();
 184                 _sound_reader.reset ();
 185                 return;
 186         }
 187
 188         if ((*_reel)->main_picture()) {
 189                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 190                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 191                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 192                 DCPOMATIC_ASSERT (mono || stereo);
 193                 if (mono) {
 194                         _mono_reader = mono->start_read ();
 195                         _stereo_reader.reset ();
 196                 } else {
 197                         _stereo_reader = stereo->start_read ();
 198                         _mono_reader.reset ();
 199                 }
 200         } else {
 201                 _mono_reader.reset ();
 202                 _stereo_reader.reset ();
 203         }
 204
 205         if ((*_reel)->main_sound()) {
 206                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 207         } else {
 208                 _sound_reader.reset ();
 209         }
 210 }
 211
 212 void
 213 DCPDecoder::seek (ContentTime t, bool accurate)
 214 {
 215         video->seek (t, accurate);
 216         audio->seek (t, accurate);
 217         subtitle->seek (t, accurate);
 218
 219         _offset = 0;
 220         _reel = _reels.begin ();
 221         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 222                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 223                 next_reel ();
 224         }
 225
 226         _next = t;
 227 }
 228
 229
 230 list<ContentTimePeriod>
 231 DCPDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 232 {
 233         return list<ContentTimePeriod> ();
 234 }
 235
 236 list<ContentTimePeriod>
 237 DCPDecoder::text_subtitles_during (ContentTimePeriod period, bool starting) const
 238 {
 239         /* XXX: inefficient */
 240
 241         list<ContentTimePeriod> ctp;
 242         double const vfr = _dcp_content->active_video_frame_rate ();
 243
 244         BOOST_FOREACH (shared_ptr<dcp::Reel> r, _reels) {
 245                 if (!r->main_subtitle ()) {
 246                         continue;
 247                 }
 248
 249                 int64_t const entry_point = r->main_subtitle()->entry_point ();
 250
 251                 list<dcp::SubtitleString> subs = r->main_subtitle()->asset()->subtitles_during (
 252                         dcp::Time (period.from.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 253                         dcp::Time (period.to.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 254                         starting
 255                         );
 256
 257                 BOOST_FOREACH (dcp::SubtitleString const & s, subs) {
 258                         ctp.push_back (
 259                                 ContentTimePeriod (
 260                                         ContentTime::from_seconds (s.in().as_seconds ()),
 261                                         ContentTime::from_seconds (s.out().as_seconds ())
 262                                         )
 263                                 );
 264                 }
 265         }
 266
 267         return ctp;
 268 }
 269
 270 void
 271 DCPDecoder::set_decode_referenced ()
 272 {
 273         _decode_referenced = true;
 274 }