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 <boost/make_shared.hpp>
  47 #include <iostream>
  48
  49 using std::list;
  50 using std::cout;
  51 using boost::shared_ptr;
  52 using boost::dynamic_pointer_cast;
  53 using boost::make_shared;
  54
  55 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, shared_ptr<Log> log, bool fast)
  56         : _dcp_content (c)
  57 {
  58         video.reset (new VideoDecoder (this, c, log));
  59         audio.reset (new AudioDecoder (this, c->audio, fast, log));
  60
  61         subtitle.reset (
  62                 new SubtitleDecoder (
  63                         this,
  64                         c->subtitle,
  65                         bind (&DCPDecoder::image_subtitles_during, this, _1, _2),
  66                         bind (&DCPDecoder::text_subtitles_during, this, _1, _2)
  67                         )
  68                 );
  69
  70         dcp::DCP dcp (c->directory ());
  71         dcp.read (false, 0, true);
  72         if (c->kdm ()) {
  73                 dcp.add (dcp::DecryptedKDM (c->kdm().get (), Config::instance()->decryption_chain()->key().get ()));
  74         }
  75         DCPOMATIC_ASSERT (dcp.cpls().size() == 1);
  76         _reels = dcp.cpls().front()->reels ();
  77
  78         _reel = _reels.begin ();
  79         _offset = 0;
  80         get_readers ();
  81 }
  82
  83 bool
  84 DCPDecoder::pass (PassReason reason, bool)
  85 {
  86         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  87                 return true;
  88         }
  89
  90         double const vfr = _dcp_content->active_video_frame_rate ();
  91
  92         /* Frame within the (played part of the) reel that is coming up next */
  93         int64_t const frame = _next.frames_round (vfr);
  94
  95         if ((_mono_reader || _stereo_reader) && reason != PASS_REASON_SUBTITLE) {
  96                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
  97                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
  98                 if (_mono_reader) {
  99                         video->give (make_shared<J2KImageProxy> (_mono_reader->get_frame (entry_point + frame), asset->size()), _offset + frame);
 100                 } else {
 101                         video->give (
 102                                 make_shared<J2KImageProxy> (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT),
 103                                 _offset + frame
 104                                 );
 105
 106                         video->give (
 107                                 make_shared<J2KImageProxy> (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT),
 108                                 _offset + frame
 109                                 );
 110                 }
 111         }
 112
 113         if (_sound_reader && reason != PASS_REASON_SUBTITLE) {
 114                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 115                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 116                 uint8_t const * from = sf->data ();
 117
 118                 int const channels = _dcp_content->audio->stream()->channels ();
 119                 int const frames = sf->size() / (3 * channels);
 120                 shared_ptr<AudioBuffers> data = make_shared<AudioBuffers> (channels, frames);
 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 ()) {
 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 }