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 "caption_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 #include "i18n.h"
  48
  49 using std::list;
  50 using std::cout;
  51 using boost::shared_ptr;
  52 using boost::dynamic_pointer_cast;
  53 using boost::optional;
  54
  55 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, shared_ptr<Log> log, bool fast)
  56         : DCP (c)
  57         , _decode_referenced (false)
  58 {
  59         if (c->video) {
  60                 video.reset (new VideoDecoder (this, c, log));
  61         }
  62         if (c->audio) {
  63                 audio.reset (new AudioDecoder (this, c->audio, log, fast));
  64         }
  65         if (c->caption) {
  66                 /* XXX: this time here should be the time of the first subtitle, not 0 */
  67                 caption.reset (new CaptionDecoder (this, c->caption, log, ContentTime()));
  68         }
  69
  70         list<shared_ptr<dcp::CPL> > cpl_list = cpls ();
  71
  72         if (cpl_list.empty()) {
  73                 throw DCPError (_("No CPLs found in DCP."));
  74         }
  75
  76         shared_ptr<dcp::CPL> cpl;
  77         BOOST_FOREACH (shared_ptr<dcp::CPL> i, cpl_list) {
  78                 if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
  79                         cpl = i;
  80                 }
  81         }
  82
  83         if (!cpl) {
  84                 /* No CPL found; probably an old file that doesn't specify it;
  85                    just use the first one.
  86                 */
  87                 cpl = cpls().front ();
  88         }
  89
  90         set_decode_referenced (false);
  91
  92         _reels = cpl->reels ();
  93
  94         _reel = _reels.begin ();
  95         _offset = 0;
  96         get_readers ();
  97 }
  98
  99
 100 bool
 101 DCPDecoder::pass ()
 102 {
 103         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
 104                 return true;
 105         }
 106
 107         double const vfr = _dcp_content->active_video_frame_rate ();
 108
 109         /* Frame within the (played part of the) reel that is coming up next */
 110         int64_t const frame = _next.frames_round (vfr);
 111
 112         /* We must emit subtitles first as when we emit the video for this frame
 113            it will expect already to have the subs.
 114         */
 115         pass_subtitles (_next);
 116
 117         if ((_mono_reader || _stereo_reader) && (_decode_referenced || !_dcp_content->reference_video())) {
 118                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 119                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
 120                 if (_mono_reader) {
 121                         video->emit (
 122                                 shared_ptr<ImageProxy> (
 123                                         new J2KImageProxy (
 124                                                 _mono_reader->get_frame (entry_point + frame),
 125                                                 asset->size(),
 126                                                 AV_PIX_FMT_XYZ12LE,
 127                                                 _forced_reduction
 128                                                 )
 129                                         ),
 130                                 _offset + frame
 131                                 );
 132                 } else {
 133                         video->emit (
 134                                 shared_ptr<ImageProxy> (
 135                                         new J2KImageProxy (
 136                                                 _stereo_reader->get_frame (entry_point + frame),
 137                                                 asset->size(),
 138                                                 dcp::EYE_LEFT,
 139                                                 AV_PIX_FMT_XYZ12LE,
 140                                                 _forced_reduction
 141                                                 )
 142                                         ),
 143                                 _offset + frame
 144                                 );
 145
 146                         video->emit (
 147                                 shared_ptr<ImageProxy> (
 148                                         new J2KImageProxy (
 149                                                 _stereo_reader->get_frame (entry_point + frame),
 150                                                 asset->size(),
 151                                                 dcp::EYE_RIGHT,
 152                                                 AV_PIX_FMT_XYZ12LE,
 153                                                 _forced_reduction
 154                                                 )
 155                                         ),
 156                                 _offset + frame
 157                                 );
 158                 }
 159         }
 160
 161         if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
 162                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 163                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 164                 uint8_t const * from = sf->data ();
 165
 166                 int const channels = _dcp_content->audio->stream()->channels ();
 167                 int const frames = sf->size() / (3 * channels);
 168                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 169                 float** data_data = data->data();
 170                 for (int i = 0; i < frames; ++i) {
 171                         for (int j = 0; j < channels; ++j) {
 172                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 173                                 from += 3;
 174                         }
 175                 }
 176
 177                 audio->emit (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 178         }
 179
 180         _next += ContentTime::from_frames (1, vfr);
 181
 182         if ((*_reel)->main_picture ()) {
 183                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 184                         next_reel ();
 185                         _next = ContentTime ();
 186                 }
 187         }
 188
 189         return false;
 190 }
 191
 192 void
 193 DCPDecoder::pass_subtitles (ContentTime next)
 194 {
 195         double const vfr = _dcp_content->active_video_frame_rate ();
 196         /* Frame within the (played part of the) reel that is coming up next */
 197         int64_t const frame = next.frames_round (vfr);
 198
 199         if ((*_reel)->main_subtitle() && (_decode_referenced || !_dcp_content->reference_subtitle())) {
 200                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 201                 list<shared_ptr<dcp::Subtitle> > subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 202                         dcp::Time (entry_point + frame, vfr, vfr),
 203                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 204                         true
 205                         );
 206
 207                 BOOST_FOREACH (shared_ptr<dcp::Subtitle> i, subs) {
 208                         shared_ptr<dcp::SubtitleString> is = dynamic_pointer_cast<dcp::SubtitleString> (i);
 209                         if (is) {
 210                                 list<dcp::SubtitleString> s;
 211                                 s.push_back (*is);
 212                                 caption->emit_plain (
 213                                         ContentTimePeriod (
 214                                                 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->in().as_seconds ()),
 215                                                 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->out().as_seconds ())
 216                                                 ),
 217                                         s
 218                                         );
 219                         }
 220
 221                         /* XXX: image subtitles */
 222                 }
 223         }
 224 }
 225
 226 void
 227 DCPDecoder::next_reel ()
 228 {
 229         _offset += (*_reel)->main_picture()->duration();
 230         ++_reel;
 231         get_readers ();
 232 }
 233
 234 void
 235 DCPDecoder::get_readers ()
 236 {
 237         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 238                 _mono_reader.reset ();
 239                 _stereo_reader.reset ();
 240                 _sound_reader.reset ();
 241                 return;
 242         }
 243
 244         if ((*_reel)->main_picture()) {
 245                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 246                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 247                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 248                 DCPOMATIC_ASSERT (mono || stereo);
 249                 if (mono) {
 250                         _mono_reader = mono->start_read ();
 251                         _stereo_reader.reset ();
 252                 } else {
 253                         _stereo_reader = stereo->start_read ();
 254                         _mono_reader.reset ();
 255                 }
 256         } else {
 257                 _mono_reader.reset ();
 258                 _stereo_reader.reset ();
 259         }
 260
 261         if ((*_reel)->main_sound()) {
 262                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 263         } else {
 264                 _sound_reader.reset ();
 265         }
 266 }
 267
 268 void
 269 DCPDecoder::seek (ContentTime t, bool accurate)
 270 {
 271         if (!_dcp_content->can_be_played ()) {
 272                 return;
 273         }
 274
 275         Decoder::seek (t, accurate);
 276
 277         _reel = _reels.begin ();
 278         _offset = 0;
 279         get_readers ();
 280
 281         int const pre_roll_seconds = 2;
 282
 283         /* Pre-roll for subs */
 284
 285         ContentTime pre = t - ContentTime::from_seconds (pre_roll_seconds);
 286         if (pre < ContentTime()) {
 287                 pre = ContentTime ();
 288         }
 289
 290         /* Seek to pre-roll position */
 291
 292         while (_reel != _reels.end() && pre >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 293                 ContentTime rd = ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 294                 pre -= rd;
 295                 t -= rd;
 296                 next_reel ();
 297         }
 298
 299         /* Pass subtitles in the pre-roll */
 300
 301         double const vfr = _dcp_content->active_video_frame_rate ();
 302         for (int i = 0; i < pre_roll_seconds * vfr; ++i) {
 303                 pass_subtitles (pre);
 304                 pre += ContentTime::from_frames (1, vfr);
 305         }
 306
 307         /* Seek to correct position */
 308
 309         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 310                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 311                 next_reel ();
 312         }
 313
 314         _next = t;
 315 }
 316
 317 void
 318 DCPDecoder::set_decode_referenced (bool r)
 319 {
 320         _decode_referenced = r;
 321
 322         if (video) {
 323                 video->set_ignore (_dcp_content->reference_video() && !_decode_referenced);
 324         }
 325         if (audio) {
 326                 audio->set_ignore (_dcp_content->reference_audio() && !_decode_referenced);
 327         }
 328 }
 329
 330 void
 331 DCPDecoder::set_forced_reduction (optional<int> reduction)
 332 {
 333         _forced_reduction = reduction;
 334 }