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/stereo_picture_asset.h>
  36 #include <dcp/reel_picture_asset.h>
  37 #include <dcp/reel_sound_asset.h>
  38 #include <dcp/reel_subtitle_asset.h>
  39 #include <dcp/mono_picture_frame.h>
  40 #include <dcp/stereo_picture_frame.h>
  41 #include <dcp/sound_frame.h>
  42 #include <boost/foreach.hpp>
  43 #include <iostream>
  44
  45 using std::list;
  46 using std::cout;
  47 using boost::shared_ptr;
  48 using boost::dynamic_pointer_cast;
  49
  50 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, shared_ptr<Log> log, bool fast)
  51         : _dcp_content (c)
  52 {
  53         video.reset (new VideoDecoder (this, c, log));
  54         audio.reset (new AudioDecoder (this, c->audio, fast, log));
  55
  56         subtitle.reset (
  57                 new SubtitleDecoder (
  58                         this,
  59                         c->subtitle,
  60                         bind (&DCPDecoder::image_subtitles_during, this, _1, _2),
  61                         bind (&DCPDecoder::text_subtitles_during, this, _1, _2)
  62                         )
  63                 );
  64
  65         dcp::DCP dcp (c->directory ());
  66         dcp.read (false, 0, true);
  67         if (c->kdm ()) {
  68                 dcp.add (dcp::DecryptedKDM (c->kdm().get (), Config::instance()->decryption_chain()->key().get ()));
  69         }
  70         DCPOMATIC_ASSERT (dcp.cpls().size() == 1);
  71         _reels = dcp.cpls().front()->reels ();
  72         _reel = _reels.begin ();
  73 }
  74
  75 bool
  76 DCPDecoder::pass (PassReason reason, bool)
  77 {
  78         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  79                 return true;
  80         }
  81
  82         /* Offset of the start of the current reel from the start of the content in frames */
  83         int offset = 0;
  84         list<shared_ptr<dcp::Reel> >::const_iterator i = _reels.begin();
  85         while (i != _reel) {
  86                 offset += (*i)->main_picture()->duration ();
  87                 ++i;
  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 ((*_reel)->main_picture () && reason != PASS_REASON_SUBTITLE) {
  96                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
  97                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
  98                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
  99                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
 100                 if (mono) {
 101                         video->give (shared_ptr<ImageProxy> (new J2KImageProxy (mono->get_frame (entry_point + frame), asset->size())), offset + frame);
 102                 } else {
 103                         video->give (
 104                                 shared_ptr<ImageProxy> (new J2KImageProxy (stereo->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT)),
 105                                 offset + frame
 106                                 );
 107
 108                         video->give (
 109                                 shared_ptr<ImageProxy> (new J2KImageProxy (stereo->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT)),
 110                                 offset + frame
 111                                 );
 112                 }
 113         }
 114
 115         if ((*_reel)->main_sound () && reason != PASS_REASON_SUBTITLE) {
 116                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 117                 shared_ptr<const dcp::SoundFrame> sf = (*_reel)->main_sound()->asset()->get_frame (entry_point + frame);
 118                 uint8_t const * from = sf->data ();
 119
 120                 int const channels = _dcp_content->audio->stream()->channels ();
 121                 int const frames = sf->size() / (3 * channels);
 122                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 123                 for (int i = 0; i < frames; ++i) {
 124                         for (int j = 0; j < channels; ++j) {
 125                                 data->data()[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 126                                 from += 3;
 127                         }
 128                 }
 129
 130                 audio->give (_dcp_content->audio->stream(), data, ContentTime::from_frames (offset, vfr) + _next);
 131         }
 132
 133         if ((*_reel)->main_subtitle ()) {
 134                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 135                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 136                         dcp::Time (entry_point + frame, vfr, vfr),
 137                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 138                         true
 139                         );
 140
 141                 if (!subs.empty ()) {
 142                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 143                         subtitle->give_text (
 144                                 ContentTimePeriod (
 145                                         ContentTime::from_frames (offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 146                                         ContentTime::from_frames (offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 147                                         ),
 148                                 subs
 149                                 );
 150                 }
 151         }
 152
 153         _next += ContentTime::from_frames (1, vfr);
 154
 155         if ((*_reel)->main_picture ()) {
 156                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 157                         ++_reel;
 158                         _next = ContentTime ();
 159                 }
 160         }
 161
 162         return false;
 163 }
 164
 165 void
 166 DCPDecoder::seek (ContentTime t, bool accurate)
 167 {
 168         video->seek (t, accurate);
 169         audio->seek (t, accurate);
 170         subtitle->seek (t, accurate);
 171
 172         _reel = _reels.begin ();
 173         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 174                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 175                 ++_reel;
 176         }
 177
 178         _next = t;
 179 }
 180
 181
 182 list<ContentTimePeriod>
 183 DCPDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 184 {
 185         return list<ContentTimePeriod> ();
 186 }
 187
 188 list<ContentTimePeriod>
 189 DCPDecoder::text_subtitles_during (ContentTimePeriod period, bool starting) const
 190 {
 191         /* XXX: inefficient */
 192
 193         list<ContentTimePeriod> ctp;
 194         double const vfr = _dcp_content->active_video_frame_rate ();
 195
 196         BOOST_FOREACH (shared_ptr<dcp::Reel> r, _reels) {
 197                 if (!r->main_subtitle ()) {
 198                         continue;
 199                 }
 200
 201                 int64_t const entry_point = r->main_subtitle()->entry_point ();
 202
 203                 list<dcp::SubtitleString> subs = r->main_subtitle()->asset()->subtitles_during (
 204                         dcp::Time (period.from.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 205                         dcp::Time (period.to.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 206                         starting
 207                         );
 208
 209                 BOOST_FOREACH (dcp::SubtitleString const & s, subs) {
 210                         ctp.push_back (
 211                                 ContentTimePeriod (
 212                                         ContentTime::from_seconds (s.in().as_seconds ()),
 213                                         ContentTime::from_seconds (s.out().as_seconds ())
 214                                         )
 215                                 );
 216                 }
 217         }
 218
 219         return ctp;
 220 }