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 #include <iostream>
  39
  40 using std::list;
  41 using std::cout;
  42 using boost::shared_ptr;
  43 using boost::dynamic_pointer_cast;
  44
  45 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, shared_ptr<Log> log, bool fast)
  46         : VideoDecoder (c->video, log)
  47         , AudioDecoder (c, fast)
  48         , SubtitleDecoder (c->subtitle)
  49         , _dcp_content (c)
  50 {
  51         dcp::DCP dcp (c->directory ());
  52         dcp.read (false, 0, true);
  53         if (c->kdm ()) {
  54                 dcp.add (dcp::DecryptedKDM (c->kdm().get (), Config::instance()->decryption_chain()->key().get ()));
  55         }
  56         DCPOMATIC_ASSERT (dcp.cpls().size() == 1);
  57         _reels = dcp.cpls().front()->reels ();
  58         _reel = _reels.begin ();
  59 }
  60
  61 bool
  62 DCPDecoder::pass (PassReason reason, bool)
  63 {
  64         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  65                 return true;
  66         }
  67
  68         /* Offset of the start of the current reel from the start of the content in frames */
  69         int offset = 0;
  70         list<shared_ptr<dcp::Reel> >::const_iterator i = _reels.begin();
  71         while (i != _reel) {
  72                 offset += (*i)->main_picture()->duration ();
  73                 ++i;
  74         }
  75
  76         double const vfr = _dcp_content->video->video_frame_rate ();
  77
  78         /* Frame within the (played part of the) reel that is coming up next */
  79         int64_t const frame = _next.frames_round (vfr);
  80
  81         if ((*_reel)->main_picture () && reason != PASS_REASON_SUBTITLE) {
  82                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
  83                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
  84                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
  85                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
  86                 if (mono) {
  87                         video (shared_ptr<ImageProxy> (new J2KImageProxy (mono->get_frame (entry_point + frame), asset->size())), offset + frame);
  88                 } else {
  89                         video (
  90                                 shared_ptr<ImageProxy> (new J2KImageProxy (stereo->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT)),
  91                                 offset + frame
  92                                 );
  93
  94                         video (
  95                                 shared_ptr<ImageProxy> (new J2KImageProxy (stereo->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT)),
  96                                 offset + frame
  97                                 );
  98                 }
  99         }
 100
 101         if ((*_reel)->main_sound () && reason != PASS_REASON_SUBTITLE) {
 102                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 103                 shared_ptr<const dcp::SoundFrame> sf = (*_reel)->main_sound()->asset()->get_frame (entry_point + frame);
 104                 uint8_t const * from = sf->data ();
 105
 106                 int const channels = _dcp_content->audio_stream()->channels ();
 107                 int const frames = sf->size() / (3 * channels);
 108                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 109                 for (int i = 0; i < frames; ++i) {
 110                         for (int j = 0; j < channels; ++j) {
 111                                 data->data()[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 112                                 from += 3;
 113                         }
 114                 }
 115
 116                 audio (_dcp_content->audio_stream(), data, ContentTime::from_frames (offset, vfr) + _next);
 117         }
 118
 119         if ((*_reel)->main_subtitle ()) {
 120                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 121                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 122                         dcp::Time (entry_point + frame, vfr, vfr),
 123                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 124                         true
 125                         );
 126
 127                 if (!subs.empty ()) {
 128                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 129                         text_subtitle (
 130                                 ContentTimePeriod (
 131                                         ContentTime::from_frames (offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 132                                         ContentTime::from_frames (offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 133                                         ),
 134                                 subs
 135                                 );
 136                 }
 137         }
 138
 139         _next += ContentTime::from_frames (1, vfr);
 140
 141         if ((*_reel)->main_picture ()) {
 142                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 143                         ++_reel;
 144                         _next = ContentTime ();
 145                 }
 146         }
 147
 148         return false;
 149 }
 150
 151 void
 152 DCPDecoder::seek (ContentTime t, bool accurate)
 153 {
 154         VideoDecoder::seek (t, accurate);
 155         AudioDecoder::seek (t, accurate);
 156         SubtitleDecoder::seek (t, accurate);
 157
 158         _reel = _reels.begin ();
 159         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->video->video_frame_rate ())) {
 160                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->video->video_frame_rate ());
 161                 ++_reel;
 162         }
 163
 164         _next = t;
 165 }
 166
 167
 168 list<ContentTimePeriod>
 169 DCPDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 170 {
 171         return list<ContentTimePeriod> ();
 172 }
 173
 174 list<ContentTimePeriod>
 175 DCPDecoder::text_subtitles_during (ContentTimePeriod period, bool starting) const
 176 {
 177         /* XXX: inefficient */
 178
 179         list<ContentTimePeriod> ctp;
 180         double const vfr = _dcp_content->video->video_frame_rate ();
 181
 182         BOOST_FOREACH (shared_ptr<dcp::Reel> r, _reels) {
 183                 if (!r->main_subtitle ()) {
 184                         continue;
 185                 }
 186
 187                 int64_t const entry_point = r->main_subtitle()->entry_point ();
 188
 189                 list<dcp::SubtitleString> subs = r->main_subtitle()->asset()->subtitles_during (
 190                         dcp::Time (period.from.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 191                         dcp::Time (period.to.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 192                         starting
 193                         );
 194
 195                 BOOST_FOREACH (dcp::SubtitleString const & s, subs) {
 196                         ctp.push_back (
 197                                 ContentTimePeriod (
 198                                         ContentTime::from_seconds (s.in().as_seconds ()),
 199                                         ContentTime::from_seconds (s.out().as_seconds ())
 200                                         )
 201                                 );
 202                 }
 203         }
 204
 205         return ctp;
 206 }