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