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
  73         _reel = _reels.begin ();
  74         _offset = 0;
  75 }
  76
  77 bool
  78 DCPDecoder::pass (PassReason reason, bool)
  79 {
  80         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  81                 return true;
  82         }
  83
  84         double const vfr = _dcp_content->active_video_frame_rate ();
  85
  86         /* Frame within the (played part of the) reel that is coming up next */
  87         int64_t const frame = _next.frames_round (vfr);
  88
  89         if ((*_reel)->main_picture () && reason != PASS_REASON_SUBTITLE) {
  90                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
  91                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
  92                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
  93                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
  94                 if (mono) {
  95                         video->give (shared_ptr<ImageProxy> (new J2KImageProxy (mono->get_frame (entry_point + frame), asset->size())), _offset + frame);
  96                 } else {
  97                         video->give (
  98                                 shared_ptr<ImageProxy> (new J2KImageProxy (stereo->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT)),
  99                                 _offset + frame
 100                                 );
 101
 102                         video->give (
 103                                 shared_ptr<ImageProxy> (new J2KImageProxy (stereo->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT)),
 104                                 _offset + frame
 105                                 );
 106                 }
 107         }
 108
 109         if ((*_reel)->main_sound () && reason != PASS_REASON_SUBTITLE) {
 110                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 111                 shared_ptr<const dcp::SoundFrame> sf = (*_reel)->main_sound()->asset()->get_frame (entry_point + frame);
 112                 uint8_t const * from = sf->data ();
 113
 114                 int const channels = _dcp_content->audio->stream()->channels ();
 115                 int const frames = sf->size() / (3 * channels);
 116                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 117                 for (int i = 0; i < frames; ++i) {
 118                         for (int j = 0; j < channels; ++j) {
 119                                 data->data()[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 120                                 from += 3;
 121                         }
 122                 }
 123
 124                 audio->give (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 125         }
 126
 127         if ((*_reel)->main_subtitle ()) {
 128                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 129                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 130                         dcp::Time (entry_point + frame, vfr, vfr),
 131                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 132                         true
 133                         );
 134
 135                 if (!subs.empty ()) {
 136                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 137                         subtitle->give_text (
 138                                 ContentTimePeriod (
 139                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 140                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 141                                         ),
 142                                 subs
 143                                 );
 144                 }
 145         }
 146
 147         _next += ContentTime::from_frames (1, vfr);
 148
 149         if ((*_reel)->main_picture ()) {
 150                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 151                         next_reel ();
 152                         _next = ContentTime ();
 153                 }
 154         }
 155
 156         return false;
 157 }
 158
 159 void
 160 DCPDecoder::next_reel ()
 161 {
 162         _offset += (*_reel)->main_picture()->duration();
 163         ++_reel;
 164 }
 165
 166 void
 167 DCPDecoder::seek (ContentTime t, bool accurate)
 168 {
 169         video->seek (t, accurate);
 170         audio->seek (t, accurate);
 171         subtitle->seek (t, accurate);
 172
 173         _offset = 0;
 174         _reel = _reels.begin ();
 175         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 176                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 177                 next_reel ();
 178         }
 179
 180         _next = t;
 181 }
 182
 183
 184 list<ContentTimePeriod>
 185 DCPDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 186 {
 187         return list<ContentTimePeriod> ();
 188 }
 189
 190 list<ContentTimePeriod>
 191 DCPDecoder::text_subtitles_during (ContentTimePeriod period, bool starting) const
 192 {
 193         /* XXX: inefficient */
 194
 195         list<ContentTimePeriod> ctp;
 196         double const vfr = _dcp_content->active_video_frame_rate ();
 197
 198         BOOST_FOREACH (shared_ptr<dcp::Reel> r, _reels) {
 199                 if (!r->main_subtitle ()) {
 200                         continue;
 201                 }
 202
 203                 int64_t const entry_point = r->main_subtitle()->entry_point ();
 204
 205                 list<dcp::SubtitleString> subs = r->main_subtitle()->asset()->subtitles_during (
 206                         dcp::Time (period.from.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 207                         dcp::Time (period.to.seconds(), 1000) - dcp::Time (entry_point, vfr, vfr),
 208                         starting
 209                         );
 210
 211                 BOOST_FOREACH (dcp::SubtitleString const & s, subs) {
 212                         ctp.push_back (
 213                                 ContentTimePeriod (
 214                                         ContentTime::from_seconds (s.in().as_seconds ()),
 215                                         ContentTime::from_seconds (s.out().as_seconds ())
 216                                         )
 217                                 );
 218                 }
 219         }
 220
 221         return ctp;
 222 }