src/lib/dcp_decoder.cc

   1 /*
   2     Copyright (C) 2014-2015 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 "j2k_image_proxy.h"
  23 #include "image.h"
  24 #include "config.h"
  25 #include <dcp/dcp.h>
  26 #include <dcp/decrypted_kdm.h>
  27 #include <dcp/cpl.h>
  28 #include <dcp/reel.h>
  29 #include <dcp/mono_picture_asset.h>
  30 #include <dcp/stereo_picture_asset.h>
  31 #include <dcp/reel_picture_asset.h>
  32 #include <dcp/reel_sound_asset.h>
  33 #include <dcp/reel_subtitle_asset.h>
  34 #include <dcp/mono_picture_frame.h>
  35 #include <dcp/stereo_picture_frame.h>
  36 #include <dcp/sound_frame.h>
  37 #include <boost/foreach.hpp>
  38
  39 using std::list;
  40 using std::cout;
  41 using boost::shared_ptr;
  42 using boost::dynamic_pointer_cast;
  43
  44 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, bool fast)
  45         : VideoDecoder (c)
  46         , AudioDecoder (c, fast)
  47         , SubtitleDecoder (c)
  48         , _dcp_content (c)
  49 {
  50         dcp::DCP dcp (c->directory ());
  51         dcp.read ();
  52         if (c->kdm ()) {
  53                 dcp.add (dcp::DecryptedKDM (c->kdm().get (), Config::instance()->decryption_chain()->key().get ()));
  54         }
  55         DCPOMATIC_ASSERT (dcp.cpls().size() == 1);
  56         _reels = dcp.cpls().front()->reels ();
  57         _reel = _reels.begin ();
  58 }
  59
  60 bool
  61 DCPDecoder::pass ()
  62 {
  63         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  64                 return true;
  65         }
  66
  67         double const vfr = _dcp_content->video_frame_rate ();
  68         int64_t const frame = _next.frames_round (vfr);
  69
  70         if ((*_reel)->main_picture ()) {
  71                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
  72                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
  73                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
  74                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
  75                 if (mono) {
  76                         video (shared_ptr<ImageProxy> (new J2KImageProxy (mono->get_frame (entry_point + frame), asset->size())), frame);
  77                 } else {
  78                         video (
  79                                 shared_ptr<ImageProxy> (new J2KImageProxy (stereo->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT)),
  80                                 frame
  81                                 );
  82
  83                         video (
  84                                 shared_ptr<ImageProxy> (new J2KImageProxy (stereo->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT)),
  85                                 frame
  86                                 );
  87                 }
  88         }
  89
  90         if ((*_reel)->main_sound ()) {
  91                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
  92                 shared_ptr<const dcp::SoundFrame> sf = (*_reel)->main_sound()->asset()->get_frame (entry_point + frame);
  93                 uint8_t const * from = sf->data ();
  94
  95                 int const channels = _dcp_content->audio_stream()->channels ();
  96                 int const frames = sf->size() / (3 * channels);
  97                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
  98                 for (int i = 0; i < frames; ++i) {
  99                         for (int j = 0; j < channels; ++j) {
 100                                 data->data()[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 101                                 from += 3;
 102                         }
 103                 }
 104
 105                 audio (_dcp_content->audio_stream(), data, _next);
 106         }
 107
 108         if ((*_reel)->main_subtitle ()) {
 109                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 110                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->subtitle_asset()->subtitles_during (
 111                         dcp::Time (entry_point + frame, vfr, vfr),
 112                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 113                         true
 114                         );
 115
 116                 if (!subs.empty ()) {
 117                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 118                         text_subtitle (
 119                                 ContentTimePeriod (
 120                                         ContentTime::from_seconds (subs.front().in().as_seconds ()),
 121                                         ContentTime::from_seconds (subs.front().out().as_seconds ())
 122                                         ),
 123                                 subs
 124                                 );
 125                 }
 126         }
 127
 128         _next += ContentTime::from_frames (1, vfr);
 129
 130         if ((*_reel)->main_picture ()) {
 131                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 132                         ++_reel;
 133                 }
 134         }
 135
 136         return false;
 137 }
 138
 139 void
 140 DCPDecoder::seek (ContentTime t, bool accurate)
 141 {
 142         VideoDecoder::seek (t, accurate);
 143         AudioDecoder::seek (t, accurate);
 144         SubtitleDecoder::seek (t, accurate);
 145
 146         _reel = _reels.begin ();
 147         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->video_frame_rate ())) {
 148                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->video_frame_rate ());
 149                 ++_reel;
 150         }
 151
 152         _next = t;
 153 }
 154
 155
 156 list<ContentTimePeriod>
 157 DCPDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 158 {
 159         return list<ContentTimePeriod> ();
 160 }
 161
 162 list<ContentTimePeriod>
 163 DCPDecoder::text_subtitles_during (ContentTimePeriod period, bool starting) const
 164 {
 165         /* XXX: inefficient */
 166
 167         list<ContentTimePeriod> ctp;
 168         double const vfr = _dcp_content->video_frame_rate ();
 169
 170         BOOST_FOREACH (shared_ptr<dcp::Reel> r, _reels) {
 171                 if (!r->main_subtitle ()) {
 172                         continue;
 173                 }
 174
 175                 int64_t const entry_point = r->main_subtitle()->entry_point ();
 176
 177                 list<dcp::SubtitleString> subs = r->main_subtitle()->subtitle_asset()->subtitles_during (
 178                         dcp::Time (period.from.seconds ()) - dcp::Time (entry_point, vfr, vfr),
 179                         dcp::Time (period.to.seconds ()) - dcp::Time (entry_point, vfr, vfr),
 180                         starting
 181                         );
 182
 183                 BOOST_FOREACH (dcp::SubtitleString const & s, subs) {
 184                         ctp.push_back (
 185                                 ContentTimePeriod (
 186                                         ContentTime::from_seconds (s.in().as_seconds ()),
 187                                         ContentTime::from_seconds (s.out().as_seconds ())
 188                                         )
 189                                 );
 190                 }
 191         }
 192
 193         return ctp;
 194 }