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