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