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