src/lib/dcp_decoder.cc

   1 /*
   2     Copyright (C) 2014-2016 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include "dcp_decoder.h"
  21 #include "dcp_content.h"
  22 #include "audio_content.h"
  23 #include "j2k_image_proxy.h"
  24 #include "image.h"
  25 #include "config.h"
  26 #include <dcp/dcp.h>
  27 #include <dcp/decrypted_kdm.h>
  28 #include <dcp/cpl.h>
  29 #include <dcp/reel.h>
  30 #include <dcp/mono_picture_asset.h>
  31 #include <dcp/stereo_picture_asset.h>
  32 #include <dcp/reel_picture_asset.h>
  33 #include <dcp/reel_sound_asset.h>
  34 #include <dcp/reel_subtitle_asset.h>
  35 #include <dcp/mono_picture_frame.h>
  36 #include <dcp/stereo_picture_frame.h>
  37 #include <dcp/sound_frame.h>
  38 #include <boost/foreach.hpp>
  39 #include <iostream>
  40
  41 using std::list;
  42 using std::cout;
  43 using boost::shared_ptr;
  44 using boost::dynamic_pointer_cast;
  45
  46 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, shared_ptr<Log> log, bool fast)
  47         : VideoDecoder (c->video, log)
  48         , AudioDecoder (c->audio, fast, log)
  49         , SubtitleDecoder (c->subtitle)
  50         , _dcp_content (c)
  51 {
  52         dcp::DCP dcp (c->directory ());
  53         dcp.read (false, 0, true);
  54         if (c->kdm ()) {
  55                 dcp.add (dcp::DecryptedKDM (c->kdm().get (), Config::instance()->decryption_chain()->key().get ()));
  56         }
  57         DCPOMATIC_ASSERT (dcp.cpls().size() == 1);
  58         _reels = dcp.cpls().front()->reels ();
  59         _reel = _reels.begin ();
  60 }
  61
  62 bool
  63 DCPDecoder::pass (PassReason reason, bool)
  64 {
  65         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  66                 return true;
  67         }
  68
  69         /* Offset of the start of the current reel from the start of the content in frames */
  70         int offset = 0;
  71         list<shared_ptr<dcp::Reel> >::const_iterator i = _reels.begin();
  72         while (i != _reel) {
  73                 offset += (*i)->main_picture()->duration ();
  74                 ++i;
  75         }
  76
  77         double const vfr = _dcp_content->video->frame_rate ();
  78
  79         /* Frame within the (played part of the) reel that is coming up next */
  80         int64_t const frame = _next.frames_round (vfr);
  81
  82         if ((*_reel)->main_picture () && reason != PASS_REASON_SUBTITLE) {
  83                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
  84                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
  85                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
  86                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
  87                 if (mono) {
  88                         video (shared_ptr<ImageProxy> (new J2KImageProxy (mono->get_frame (entry_point + frame), asset->size())), offset + frame);
  89                 } else {
  90                         video (
  91                                 shared_ptr<ImageProxy> (new J2KImageProxy (stereo->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT)),
  92                                 offset + frame
  93                                 );
  94
  95                         video (
  96                                 shared_ptr<ImageProxy> (new J2KImageProxy (stereo->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT)),
  97                                 offset + frame
  98                                 );
  99                 }
 100         }
 101
 102         if ((*_reel)->main_sound () && reason != PASS_REASON_SUBTITLE) {
 103                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 104                 shared_ptr<const dcp::SoundFrame> sf = (*_reel)->main_sound()->asset()->get_frame (entry_point + frame);
 105                 uint8_t const * from = sf->data ();
 106
 107                 int const channels = _dcp_content->audio->stream()->channels ();
 108                 int const frames = sf->size() / (3 * channels);
 109                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 110                 for (int i = 0; i < frames; ++i) {
 111                         for (int j = 0; j < channels; ++j) {
 112                                 data->data()[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 113                                 from += 3;
 114                         }
 115                 }
 116
 117                 audio (_dcp_content->audio->stream(), data, ContentTime::from_frames (offset, vfr) + _next);
 118         }
 119
 120         if ((*_reel)->main_subtitle ()) {
 121                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 122                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 123                         dcp::Time (entry_point + frame, vfr, vfr),
 124                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 125                         true
 126                         );
 127
 128                 if (!subs.empty ()) {
 129                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 130                         text_subtitle (
 131                                 ContentTimePeriod (
 132                                         ContentTime::from_frames (offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 133                                         ContentTime::from_frames (offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 134                                         ),
 135                                 subs
 136                                 );
 137                 }
 138         }
 139
 140         _next += ContentTime::from_frames (1, vfr);
 141
 142         if ((*_reel)->main_picture ()) {
 143                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 144                         ++_reel;
 145                         _next = ContentTime ();
 146                 }
 147         }
 148
 149         return false;
 150 }
 151
 152 void
 153 DCPDecoder::seek (ContentTime t, bool accurate)
 154 {
 155         VideoDecoder::seek (t, accurate);
 156         AudioDecoder::seek (t, accurate);
 157         SubtitleDecoder::seek (t, accurate);
 158
 159         _reel = _reels.begin ();
 160         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->video->frame_rate ())) {
 161                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->video->frame_rate ());
 162                 ++_reel;
 163         }
 164
 165         _next = t;
 166 }
 167
 168
 169 list<ContentTimePeriod>
 170 DCPDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 171 {
 172         return list<ContentTimePeriod> ();
 173 }
 174
 175 list<ContentTimePeriod>
 176 DCPDecoder::text_subtitles_during (ContentTimePeriod period, bool starting) const
 177 {
 178         /* XXX: inefficient */
 179
 180         list<ContentTimePeriod> ctp;
 181         double const vfr = _dcp_content->video->frame_rate ();
 182
 183         BOOST_FOREACH (shared_ptr<dcp::Reel> r, _reels) {
 184                 if (!r->main_subtitle ()) {
 185                         continue;
 186                 }
 187
 188                 int64_t const entry_point = r->main_subtitle()->entry_point ();
 189
 190                 list<dcp::SubtitleString> subs = r->main_subtitle()->asset()->subtitles_during (
 191                         dcp::Time (period.from.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 192                         dcp::Time (period.to.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 193                         starting
 194                         );
 195
 196                 BOOST_FOREACH (dcp::SubtitleString const & s, subs) {
 197                         ctp.push_back (
 198                                 ContentTimePeriod (
 199                                         ContentTime::from_seconds (s.in().as_seconds ()),
 200                                         ContentTime::from_seconds (s.out().as_seconds ())
 201                                         )
 202                                 );
 203                 }
 204         }
 205
 206         return ctp;
 207 }