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/mono_picture_asset_reader.h>
  36 #include <dcp/stereo_picture_asset.h>
  37 #include <dcp/stereo_picture_asset_reader.h>
  38 #include <dcp/reel_picture_asset.h>
  39 #include <dcp/reel_sound_asset.h>
  40 #include <dcp/reel_subtitle_asset.h>
  41 #include <dcp/mono_picture_frame.h>
  42 #include <dcp/stereo_picture_frame.h>
  43 #include <dcp/sound_frame.h>
  44 #include <dcp/sound_asset_reader.h>
  45 #include <boost/foreach.hpp>
  46 #include <iostream>
  47
  48 using std::list;
  49 using std::cout;
  50 using boost::shared_ptr;
  51 using boost::dynamic_pointer_cast;
  52
  53 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, shared_ptr<Log> log)
  54         : DCP (c)
  55         , _decode_referenced (false)
  56 {
  57         video.reset (new VideoDecoder (this, c, log));
  58         audio.reset (new AudioDecoder (this, c->audio, log));
  59
  60         subtitle.reset (
  61                 new SubtitleDecoder (
  62                         this,
  63                         c->subtitle,
  64                         bind (&DCPDecoder::image_subtitles_during, this, _1, _2),
  65                         bind (&DCPDecoder::text_subtitles_during, this, _1, _2)
  66                         )
  67                 );
  68
  69         shared_ptr<dcp::CPL> cpl;
  70         BOOST_FOREACH (shared_ptr<dcp::CPL> i, cpls ()) {
  71                 if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
  72                         cpl = i;
  73                 }
  74         }
  75
  76         if (!cpl) {
  77                 /* No CPL found; probably an old file that doesn't specify it;
  78                    just use the first one.
  79                 */
  80                 cpl = cpls().front ();
  81         }
  82
  83         _reels = cpl->reels ();
  84
  85         _reel = _reels.begin ();
  86         _offset = 0;
  87         get_readers ();
  88 }
  89
  90 bool
  91 DCPDecoder::pass (PassReason reason, bool)
  92 {
  93         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  94                 return true;
  95         }
  96
  97         double const vfr = _dcp_content->active_video_frame_rate ();
  98
  99         /* Frame within the (played part of the) reel that is coming up next */
 100         int64_t const frame = _next.frames_round (vfr);
 101
 102         if ((_mono_reader || _stereo_reader) && reason != PASS_REASON_SUBTITLE && (_decode_referenced || !_dcp_content->reference_video())) {
 103                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 104                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
 105                 if (_mono_reader) {
 106                         video->give (
 107                                 shared_ptr<ImageProxy> (
 108                                         new J2KImageProxy (_mono_reader->get_frame (entry_point + frame), asset->size(), AV_PIX_FMT_XYZ12LE)
 109                                         ),
 110                                 _offset + frame
 111                                 );
 112                 } else {
 113                         video->give (
 114                                 shared_ptr<ImageProxy> (
 115                                         new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT, AV_PIX_FMT_XYZ12LE)),
 116                                 _offset + frame
 117                                 );
 118
 119                         video->give (
 120                                 shared_ptr<ImageProxy> (
 121                                         new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT, AV_PIX_FMT_XYZ12LE)),
 122                                 _offset + frame
 123                                 );
 124                 }
 125         }
 126
 127         if (_sound_reader && reason != PASS_REASON_SUBTITLE && (_decode_referenced || !_dcp_content->reference_audio())) {
 128                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 129                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 130                 uint8_t const * from = sf->data ();
 131
 132                 int const channels = _dcp_content->audio->stream()->channels ();
 133                 int const frames = sf->size() / (3 * channels);
 134                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 135                 float** data_data = data->data();
 136                 for (int i = 0; i < frames; ++i) {
 137                         for (int j = 0; j < channels; ++j) {
 138                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 139                                 from += 3;
 140                         }
 141                 }
 142
 143                 audio->give (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 144         }
 145
 146         if ((*_reel)->main_subtitle() && (_decode_referenced || !_dcp_content->reference_subtitle())) {
 147                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 148                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 149                         dcp::Time (entry_point + frame, vfr, vfr),
 150                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 151                         true
 152                         );
 153
 154                 if (!subs.empty ()) {
 155                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 156                         subtitle->give_text (
 157                                 ContentTimePeriod (
 158                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 159                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 160                                         ),
 161                                 subs
 162                                 );
 163                 }
 164         }
 165
 166         video->set_position (_next);
 167         audio->set_position (_next);
 168         subtitle->set_position (_next);
 169         _next += ContentTime::from_frames (1, vfr);
 170
 171         if ((*_reel)->main_picture ()) {
 172                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 173                         next_reel ();
 174                         _next = ContentTime ();
 175                 }
 176         }
 177
 178         return false;
 179 }
 180
 181 void
 182 DCPDecoder::next_reel ()
 183 {
 184         _offset += (*_reel)->main_picture()->duration();
 185         ++_reel;
 186         get_readers ();
 187 }
 188
 189 void
 190 DCPDecoder::get_readers ()
 191 {
 192         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 193                 _mono_reader.reset ();
 194                 _stereo_reader.reset ();
 195                 _sound_reader.reset ();
 196                 return;
 197         }
 198
 199         if ((*_reel)->main_picture()) {
 200                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 201                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 202                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 203                 DCPOMATIC_ASSERT (mono || stereo);
 204                 if (mono) {
 205                         _mono_reader = mono->start_read ();
 206                         _stereo_reader.reset ();
 207                 } else {
 208                         _stereo_reader = stereo->start_read ();
 209                         _mono_reader.reset ();
 210                 }
 211         } else {
 212                 _mono_reader.reset ();
 213                 _stereo_reader.reset ();
 214         }
 215
 216         if ((*_reel)->main_sound()) {
 217                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 218         } else {
 219                 _sound_reader.reset ();
 220         }
 221 }
 222
 223 void
 224 DCPDecoder::seek (ContentTime t, bool accurate)
 225 {
 226         video->seek (t, accurate);
 227         audio->seek (t, accurate);
 228         subtitle->seek (t, accurate);
 229
 230         _reel = _reels.begin ();
 231         _offset = 0;
 232         get_readers ();
 233
 234         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 235                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 236                 next_reel ();
 237         }
 238
 239         _next = t;
 240 }
 241
 242
 243 list<ContentTimePeriod>
 244 DCPDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 245 {
 246         return list<ContentTimePeriod> ();
 247 }
 248
 249 list<ContentTimePeriod>
 250 DCPDecoder::text_subtitles_during (ContentTimePeriod period, bool starting) const
 251 {
 252         /* XXX: inefficient */
 253
 254         list<ContentTimePeriod> ctp;
 255         double const vfr = _dcp_content->active_video_frame_rate ();
 256
 257         int offset = 0;
 258
 259         BOOST_FOREACH (shared_ptr<dcp::Reel> r, _reels) {
 260                 if (!r->main_subtitle ()) {
 261                         offset += r->main_picture()->duration();
 262                         continue;
 263                 }
 264
 265                 int64_t const entry_point = r->main_subtitle()->entry_point ();
 266
 267                 list<dcp::SubtitleString> subs = r->main_subtitle()->asset()->subtitles_during (
 268                         dcp::Time (period.from.seconds(), 1000) - dcp::Time (offset - entry_point, vfr, vfr),
 269                         dcp::Time (period.to.seconds(), 1000) - dcp::Time (offset - entry_point, vfr, vfr),
 270                         starting
 271                         );
 272
 273                 BOOST_FOREACH (dcp::SubtitleString const & s, subs) {
 274                         ctp.push_back (
 275                                 ContentTimePeriod (
 276                                         ContentTime::from_seconds (s.in().as_seconds ()) + ContentTime::from_frames (offset - entry_point, vfr),
 277                                         ContentTime::from_seconds (s.out().as_seconds ()) + ContentTime::from_frames (offset - entry_point, vfr)
 278                                         )
 279                                 );
 280                 }
 281
 282                 offset += r->main_subtitle()->duration();
 283         }
 284
 285         return ctp;
 286 }
 287
 288 void
 289 DCPDecoder::set_decode_referenced ()
 290 {
 291         _decode_referenced = true;
 292 }