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, bool fast)
  54         : _dcp_content (c)
  55 {
  56         video.reset (new VideoDecoder (this, c, log));
  57         audio.reset (new AudioDecoder (this, c->audio, fast, log));
  58
  59         subtitle.reset (
  60                 new SubtitleDecoder (
  61                         this,
  62                         c->subtitle,
  63                         bind (&DCPDecoder::image_subtitles_during, this, _1, _2),
  64                         bind (&DCPDecoder::text_subtitles_during, this, _1, _2)
  65                         )
  66                 );
  67
  68         dcp::DCP dcp (c->directory ());
  69         dcp.read (false, 0, true);
  70         if (c->kdm ()) {
  71                 dcp.add (dcp::DecryptedKDM (c->kdm().get (), Config::instance()->decryption_chain()->key().get ()));
  72         }
  73         DCPOMATIC_ASSERT (dcp.cpls().size() == 1);
  74         _reels = dcp.cpls().front()->reels ();
  75
  76         _reel = _reels.begin ();
  77         _offset = 0;
  78         get_readers ();
  79 }
  80
  81 bool
  82 DCPDecoder::pass (PassReason reason, bool)
  83 {
  84         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  85                 return true;
  86         }
  87
  88         double const vfr = _dcp_content->active_video_frame_rate ();
  89
  90         /* Frame within the (played part of the) reel that is coming up next */
  91         int64_t const frame = _next.frames_round (vfr);
  92
  93         if ((_mono_reader || _stereo_reader) && reason != PASS_REASON_SUBTITLE) {
  94                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
  95                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
  96                 if (_mono_reader) {
  97                         video->give (shared_ptr<ImageProxy> (new J2KImageProxy (_mono_reader->get_frame (entry_point + frame), asset->size())), _offset + frame);
  98                 } else {
  99                         video->give (
 100                                 shared_ptr<ImageProxy> (new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT)),
 101                                 _offset + frame
 102                                 );
 103
 104                         video->give (
 105                                 shared_ptr<ImageProxy> (new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT)),
 106                                 _offset + frame
 107                                 );
 108                 }
 109         }
 110
 111         if (_sound_reader && reason != PASS_REASON_SUBTITLE) {
 112                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 113                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 114                 uint8_t const * from = sf->data ();
 115
 116                 int const channels = _dcp_content->audio->stream()->channels ();
 117                 int const frames = sf->size() / (3 * channels);
 118                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 119                 for (int i = 0; i < frames; ++i) {
 120                         for (int j = 0; j < channels; ++j) {
 121                                 data->data()[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 122                                 from += 3;
 123                         }
 124                 }
 125
 126                 audio->give (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 127         }
 128
 129         if ((*_reel)->main_subtitle ()) {
 130                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 131                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 132                         dcp::Time (entry_point + frame, vfr, vfr),
 133                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 134                         true
 135                         );
 136
 137                 if (!subs.empty ()) {
 138                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 139                         subtitle->give_text (
 140                                 ContentTimePeriod (
 141                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 142                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 143                                         ),
 144                                 subs
 145                                 );
 146                 }
 147         }
 148
 149         _next += ContentTime::from_frames (1, vfr);
 150
 151         if ((*_reel)->main_picture ()) {
 152                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 153                         next_reel ();
 154                         _next = ContentTime ();
 155                 }
 156         }
 157
 158         return false;
 159 }
 160
 161 void
 162 DCPDecoder::next_reel ()
 163 {
 164         _offset += (*_reel)->main_picture()->duration();
 165         ++_reel;
 166         get_readers ();
 167 }
 168
 169 void
 170 DCPDecoder::get_readers ()
 171 {
 172         if (_reel == _reels.end()) {
 173                 _mono_reader.reset ();
 174                 _stereo_reader.reset ();
 175                 _sound_reader.reset ();
 176                 return;
 177         }
 178
 179         if ((*_reel)->main_picture()) {
 180                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 181                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 182                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 183                 DCPOMATIC_ASSERT (mono || stereo);
 184                 if (mono) {
 185                         _mono_reader = mono->start_read ();
 186                         _stereo_reader.reset ();
 187                 } else {
 188                         _stereo_reader = stereo->start_read ();
 189                         _mono_reader.reset ();
 190                 }
 191         } else {
 192                 _mono_reader.reset ();
 193                 _stereo_reader.reset ();
 194         }
 195
 196         if ((*_reel)->main_sound()) {
 197                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 198         } else {
 199                 _sound_reader.reset ();
 200         }
 201 }
 202
 203 void
 204 DCPDecoder::seek (ContentTime t, bool accurate)
 205 {
 206         video->seek (t, accurate);
 207         audio->seek (t, accurate);
 208         subtitle->seek (t, accurate);
 209
 210         _offset = 0;
 211         _reel = _reels.begin ();
 212         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 213                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 214                 next_reel ();
 215         }
 216
 217         _next = t;
 218 }
 219
 220
 221 list<ContentTimePeriod>
 222 DCPDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 223 {
 224         return list<ContentTimePeriod> ();
 225 }
 226
 227 list<ContentTimePeriod>
 228 DCPDecoder::text_subtitles_during (ContentTimePeriod period, bool starting) const
 229 {
 230         /* XXX: inefficient */
 231
 232         list<ContentTimePeriod> ctp;
 233         double const vfr = _dcp_content->active_video_frame_rate ();
 234
 235         BOOST_FOREACH (shared_ptr<dcp::Reel> r, _reels) {
 236                 if (!r->main_subtitle ()) {
 237                         continue;
 238                 }
 239
 240                 int64_t const entry_point = r->main_subtitle()->entry_point ();
 241
 242                 list<dcp::SubtitleString> subs = r->main_subtitle()->asset()->subtitles_during (
 243                         dcp::Time (period.from.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 244                         dcp::Time (period.to.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 245                         starting
 246                         );
 247
 248                 BOOST_FOREACH (dcp::SubtitleString const & s, subs) {
 249                         ctp.push_back (
 250                                 ContentTimePeriod (
 251                                         ContentTime::from_seconds (s.in().as_seconds ()),
 252                                         ContentTime::from_seconds (s.out().as_seconds ())
 253                                         )
 254                                 );
 255                 }
 256         }
 257
 258         return ctp;
 259 }