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
  52 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, shared_ptr<Log> log)
  53         : DCP (c)
  54         , _decode_referenced (false)
  55 {
  56         video.reset (new VideoDecoder (this, c, log));
  57         if (c->audio) {
  58                 audio.reset (new AudioDecoder (this, c->audio, log));
  59         }
  60         if (c->subtitle) {
  61                 subtitle.reset (new SubtitleDecoder (this, c->subtitle, log));
  62         }
  63
  64         shared_ptr<dcp::CPL> cpl;
  65         BOOST_FOREACH (shared_ptr<dcp::CPL> i, cpls ()) {
  66                 if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
  67                         cpl = i;
  68                 }
  69         }
  70
  71         if (!cpl) {
  72                 /* No CPL found; probably an old file that doesn't specify it;
  73                    just use the first one.
  74                 */
  75                 cpl = cpls().front ();
  76         }
  77
  78         _reels = cpl->reels ();
  79
  80         _reel = _reels.begin ();
  81         _offset = 0;
  82         get_readers ();
  83 }
  84
  85 bool
  86 DCPDecoder::pass ()
  87 {
  88         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  89                 return true;
  90         }
  91
  92         double const vfr = _dcp_content->active_video_frame_rate ();
  93
  94         /* Frame within the (played part of the) reel that is coming up next */
  95         int64_t const frame = _next.frames_round (vfr);
  96
  97         if ((_mono_reader || _stereo_reader) && (_decode_referenced || !_dcp_content->reference_video())) {
  98                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
  99                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
 100                 if (_mono_reader) {
 101                         video->emit (
 102                                 shared_ptr<ImageProxy> (
 103                                         new J2KImageProxy (_mono_reader->get_frame (entry_point + frame), asset->size(), AV_PIX_FMT_XYZ12LE)
 104                                         ),
 105                                 _offset + frame
 106                                 );
 107                 } else {
 108                         video->emit (
 109                                 shared_ptr<ImageProxy> (
 110                                         new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT, AV_PIX_FMT_XYZ12LE)),
 111                                 _offset + frame
 112                                 );
 113
 114                         video->emit (
 115                                 shared_ptr<ImageProxy> (
 116                                         new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT, AV_PIX_FMT_XYZ12LE)),
 117                                 _offset + frame
 118                                 );
 119                 }
 120         }
 121
 122         if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
 123                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 124                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 125                 uint8_t const * from = sf->data ();
 126
 127                 int const channels = _dcp_content->audio->stream()->channels ();
 128                 int const frames = sf->size() / (3 * channels);
 129                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 130                 float** data_data = data->data();
 131                 for (int i = 0; i < frames; ++i) {
 132                         for (int j = 0; j < channels; ++j) {
 133                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 134                                 from += 3;
 135                         }
 136                 }
 137
 138                 audio->emit (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 139         }
 140
 141         if ((*_reel)->main_subtitle() && (_decode_referenced || !_dcp_content->reference_subtitle())) {
 142                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 143                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 144                         dcp::Time (entry_point + frame, vfr, vfr),
 145                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 146                         true
 147                         );
 148
 149                 if (!subs.empty ()) {
 150                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 151                         subtitle->emit_text (
 152                                 ContentTimePeriod (
 153                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 154                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 155                                         ),
 156                                 subs
 157                                 );
 158                 }
 159         }
 160
 161         _next += ContentTime::from_frames (1, vfr);
 162
 163         if ((*_reel)->main_picture ()) {
 164                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 165                         next_reel ();
 166                         _next = ContentTime ();
 167                 }
 168         }
 169
 170         return false;
 171 }
 172
 173 void
 174 DCPDecoder::next_reel ()
 175 {
 176         _offset += (*_reel)->main_picture()->duration();
 177         ++_reel;
 178         get_readers ();
 179 }
 180
 181 void
 182 DCPDecoder::get_readers ()
 183 {
 184         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 185                 _mono_reader.reset ();
 186                 _stereo_reader.reset ();
 187                 _sound_reader.reset ();
 188                 return;
 189         }
 190
 191         if ((*_reel)->main_picture()) {
 192                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 193                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 194                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 195                 DCPOMATIC_ASSERT (mono || stereo);
 196                 if (mono) {
 197                         _mono_reader = mono->start_read ();
 198                         _stereo_reader.reset ();
 199                 } else {
 200                         _stereo_reader = stereo->start_read ();
 201                         _mono_reader.reset ();
 202                 }
 203         } else {
 204                 _mono_reader.reset ();
 205                 _stereo_reader.reset ();
 206         }
 207
 208         if ((*_reel)->main_sound()) {
 209                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 210         } else {
 211                 _sound_reader.reset ();
 212         }
 213 }
 214
 215 void
 216 DCPDecoder::seek (ContentTime t, bool accurate)
 217 {
 218         Decoder::seek (t, accurate);
 219
 220         _reel = _reels.begin ();
 221         _offset = 0;
 222         get_readers ();
 223
 224         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 225                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 226                 next_reel ();
 227         }
 228
 229         _next = t;
 230 }
 231
 232 void
 233 DCPDecoder::set_decode_referenced ()
 234 {
 235         _decode_referenced = true;
 236 }