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