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/cpl.h>
  32 #include <dcp/reel.h>
  33 #include <dcp/mono_picture_asset.h>
  34 #include <dcp/mono_picture_asset_reader.h>
  35 #include <dcp/stereo_picture_asset.h>
  36 #include <dcp/stereo_picture_asset_reader.h>
  37 #include <dcp/reel_picture_asset.h>
  38 #include <dcp/reel_sound_asset.h>
  39 #include <dcp/reel_subtitle_asset.h>
  40 #include <dcp/mono_picture_frame.h>
  41 #include <dcp/stereo_picture_frame.h>
  42 #include <dcp/sound_frame.h>
  43 #include <dcp/sound_asset_reader.h>
  44 #include <boost/foreach.hpp>
  45 #include <iostream>
  46
  47 using std::list;
  48 using std::cout;
  49 using boost::shared_ptr;
  50 using boost::dynamic_pointer_cast;
  51 using boost::optional;
  52
  53 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, shared_ptr<Log> log, bool fast)
  54         : DCP (c)
  55         , _decode_referenced (false)
  56 {
  57         if (c->video) {
  58                 video.reset (new VideoDecoder (this, c, log));
  59         }
  60         if (c->audio) {
  61                 audio.reset (new AudioDecoder (this, c->audio, log, fast));
  62         }
  63         if (c->subtitle) {
  64                 /* XXX: this time here should be the time of the first subtitle, not 0 */
  65                 subtitle.reset (new SubtitleDecoder (this, c->subtitle, log, ContentTime()));
  66         }
  67
  68         shared_ptr<dcp::CPL> cpl;
  69         BOOST_FOREACH (shared_ptr<dcp::CPL> i, cpls ()) {
  70                 if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
  71                         cpl = i;
  72                 }
  73         }
  74
  75         if (!cpl) {
  76                 /* No CPL found; probably an old file that doesn't specify it;
  77                    just use the first one.
  78                 */
  79                 cpl = cpls().front ();
  80         }
  81
  82         set_decode_referenced (false);
  83
  84         _reels = cpl->reels ();
  85
  86         _reel = _reels.begin ();
  87         _offset = 0;
  88         get_readers ();
  89 }
  90
  91
  92 bool
  93 DCPDecoder::pass ()
  94 {
  95         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  96                 return true;
  97         }
  98
  99         double const vfr = _dcp_content->active_video_frame_rate ();
 100
 101         /* Frame within the (played part of the) reel that is coming up next */
 102         int64_t const frame = _next.frames_round (vfr);
 103
 104         /* We must emit subtitles first as when we emit the video for this frame
 105            it will expect already to have the subs.
 106         */
 107         pass_subtitles (_next);
 108
 109         if ((_mono_reader || _stereo_reader) && (_decode_referenced || !_dcp_content->reference_video())) {
 110                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 111                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
 112                 if (_mono_reader) {
 113                         video->emit (
 114                                 shared_ptr<ImageProxy> (
 115                                         new J2KImageProxy (
 116                                                 _mono_reader->get_frame (entry_point + frame),
 117                                                 asset->size(),
 118                                                 AV_PIX_FMT_XYZ12LE,
 119                                                 _forced_reduction
 120                                                 )
 121                                         ),
 122                                 _offset + frame
 123                                 );
 124                 } else {
 125                         video->emit (
 126                                 shared_ptr<ImageProxy> (
 127                                         new J2KImageProxy (
 128                                                 _stereo_reader->get_frame (entry_point + frame),
 129                                                 asset->size(),
 130                                                 dcp::EYE_LEFT,
 131                                                 AV_PIX_FMT_XYZ12LE,
 132                                                 _forced_reduction
 133                                                 )
 134                                         ),
 135                                 _offset + frame
 136                                 );
 137
 138                         video->emit (
 139                                 shared_ptr<ImageProxy> (
 140                                         new J2KImageProxy (
 141                                                 _stereo_reader->get_frame (entry_point + frame),
 142                                                 asset->size(),
 143                                                 dcp::EYE_RIGHT,
 144                                                 AV_PIX_FMT_XYZ12LE,
 145                                                 _forced_reduction
 146                                                 )
 147                                         ),
 148                                 _offset + frame
 149                                 );
 150                 }
 151         }
 152
 153         if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
 154                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 155                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 156                 uint8_t const * from = sf->data ();
 157
 158                 int const channels = _dcp_content->audio->stream()->channels ();
 159                 int const frames = sf->size() / (3 * channels);
 160                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 161                 float** data_data = data->data();
 162                 for (int i = 0; i < frames; ++i) {
 163                         for (int j = 0; j < channels; ++j) {
 164                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 165                                 from += 3;
 166                         }
 167                 }
 168
 169                 audio->emit (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 170         }
 171
 172         _next += ContentTime::from_frames (1, vfr);
 173
 174         if ((*_reel)->main_picture ()) {
 175                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 176                         next_reel ();
 177                         _next = ContentTime ();
 178                 }
 179         }
 180
 181         return false;
 182 }
 183
 184 void
 185 DCPDecoder::pass_subtitles (ContentTime next)
 186 {
 187         double const vfr = _dcp_content->active_video_frame_rate ();
 188         /* Frame within the (played part of the) reel that is coming up next */
 189         int64_t const frame = next.frames_round (vfr);
 190
 191         if ((*_reel)->main_subtitle() && (_decode_referenced || !_dcp_content->reference_subtitle())) {
 192                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 193                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 194                         dcp::Time (entry_point + frame, vfr, vfr),
 195                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 196                         true
 197                         );
 198
 199                 BOOST_FOREACH (dcp::SubtitleString i, subs) {
 200                         list<dcp::SubtitleString> s;
 201                         s.push_back (i);
 202                         subtitle->emit_text (
 203                                 ContentTimePeriod (
 204                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i.in().as_seconds ()),
 205                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i.out().as_seconds ())
 206                                         ),
 207                                 s
 208                                 );
 209                 }
 210         }
 211 }
 212
 213 void
 214 DCPDecoder::next_reel ()
 215 {
 216         _offset += (*_reel)->main_picture()->duration();
 217         ++_reel;
 218         get_readers ();
 219 }
 220
 221 void
 222 DCPDecoder::get_readers ()
 223 {
 224         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 225                 _mono_reader.reset ();
 226                 _stereo_reader.reset ();
 227                 _sound_reader.reset ();
 228                 return;
 229         }
 230
 231         if ((*_reel)->main_picture()) {
 232                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 233                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 234                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 235                 DCPOMATIC_ASSERT (mono || stereo);
 236                 if (mono) {
 237                         _mono_reader = mono->start_read ();
 238                         _stereo_reader.reset ();
 239                 } else {
 240                         _stereo_reader = stereo->start_read ();
 241                         _mono_reader.reset ();
 242                 }
 243         } else {
 244                 _mono_reader.reset ();
 245                 _stereo_reader.reset ();
 246         }
 247
 248         if ((*_reel)->main_sound()) {
 249                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 250         } else {
 251                 _sound_reader.reset ();
 252         }
 253 }
 254
 255 void
 256 DCPDecoder::seek (ContentTime t, bool accurate)
 257 {
 258         if (!_dcp_content->can_be_played ()) {
 259                 return;
 260         }
 261
 262         Decoder::seek (t, accurate);
 263
 264         _reel = _reels.begin ();
 265         _offset = 0;
 266         get_readers ();
 267
 268         int const pre_roll_seconds = 2;
 269
 270         /* Pre-roll for subs */
 271
 272         ContentTime pre = t - ContentTime::from_seconds (pre_roll_seconds);
 273         if (pre < ContentTime()) {
 274                 pre = ContentTime ();
 275         }
 276
 277         /* Seek to pre-roll position */
 278
 279         while (_reel != _reels.end() && pre >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 280                 ContentTime rd = ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 281                 pre -= rd;
 282                 t -= rd;
 283                 next_reel ();
 284         }
 285
 286         /* Pass subtitles in the pre-roll */
 287
 288         double const vfr = _dcp_content->active_video_frame_rate ();
 289         for (int i = 0; i < pre_roll_seconds * vfr; ++i) {
 290                 pass_subtitles (pre);
 291                 pre += ContentTime::from_frames (1, vfr);
 292         }
 293
 294         /* Seek to correct position */
 295
 296         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 297                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 298                 next_reel ();
 299         }
 300
 301         _next = t;
 302 }
 303
 304 void
 305 DCPDecoder::set_decode_referenced (bool r)
 306 {
 307         _decode_referenced = r;
 308
 309         if (video) {
 310                 video->set_ignore (_dcp_content->reference_video() && !_decode_referenced);
 311         }
 312         if (audio) {
 313                 audio->set_ignore (_dcp_content->reference_audio() && !_decode_referenced);
 314         }
 315 }
 316
 317 void
 318 DCPDecoder::set_forced_reduction (optional<int> reduction)
 319 {
 320         _forced_reduction = reduction;
 321 }