src/lib/dcp_examiner.cc

   1 /*
   2     Copyright (C) 2014 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_examiner.h"
  22 #include "dcp_content.h"
  23 #include "exceptions.h"
  24 #include "image.h"
  25 #include "config.h"
  26 #include <dcp/dcp.h>
  27 #include <dcp/decrypted_kdm.h>
  28 #include <dcp/cpl.h>
  29 #include <dcp/reel.h>
  30 #include <dcp/reel_picture_asset.h>
  31 #include <dcp/reel_sound_asset.h>
  32 #include <dcp/mono_picture_asset.h>
  33 #include <dcp/mono_picture_asset_reader.h>
  34 #include <dcp/mono_picture_frame.h>
  35 #include <dcp/stereo_picture_asset.h>
  36 #include <dcp/stereo_picture_asset_reader.h>
  37 #include <dcp/stereo_picture_frame.h>
  38 #include <dcp/sound_asset.h>
  39 #include <iostream>
  40
  41 #include "i18n.h"
  42
  43 using std::list;
  44 using std::cout;
  45 using std::runtime_error;
  46 using boost::shared_ptr;
  47 using boost::dynamic_pointer_cast;
  48
  49 DCPExaminer::DCPExaminer (shared_ptr<const DCPContent> content)
  50         : _video_length (0)
  51         , _audio_length (0)
  52         , _has_subtitles (false)
  53         , _encrypted (false)
  54         , _kdm_valid (false)
  55 {
  56         dcp::DCP dcp (content->directory ());
  57         dcp.read (false, 0, true);
  58
  59         if (content->kdm ()) {
  60                 dcp.add (dcp::DecryptedKDM (content->kdm().get(), Config::instance()->decryption_chain()->key().get ()));
  61         }
  62
  63         if (dcp.cpls().size() == 0) {
  64                 throw DCPError ("No CPLs found in DCP");
  65         } else if (dcp.cpls().size() > 1) {
  66                 throw DCPError ("Multiple CPLs found in DCP");
  67         }
  68
  69         _name = dcp.cpls().front()->content_title_text ();
  70
  71         list<shared_ptr<dcp::Reel> > reels = dcp.cpls().front()->reels ();
  72         for (list<shared_ptr<dcp::Reel> >::const_iterator i = reels.begin(); i != reels.end(); ++i) {
  73
  74                 if ((*i)->main_picture ()) {
  75                         dcp::Fraction const frac = (*i)->main_picture()->frame_rate ();
  76                         float const fr = float(frac.numerator) / frac.denominator;
  77                         if (!_video_frame_rate) {
  78                                 _video_frame_rate = fr;
  79                         } else if (_video_frame_rate.get() != fr) {
  80                                 throw DCPError (_("Mismatched frame rates in DCP"));
  81                         }
  82
  83                         shared_ptr<dcp::PictureAsset> asset = (*i)->main_picture()->asset ();
  84                         if (!_video_size) {
  85                                 _video_size = asset->size ();
  86                         } else if (_video_size.get() != asset->size ()) {
  87                                 throw DCPError (_("Mismatched video sizes in DCP"));
  88                         }
  89
  90                         _video_length += (*i)->main_picture()->duration();
  91                 }
  92
  93                 if ((*i)->main_sound ()) {
  94                         shared_ptr<dcp::SoundAsset> asset = (*i)->main_sound()->asset ();
  95
  96                         if (!_audio_channels) {
  97                                 _audio_channels = asset->channels ();
  98                         } else if (_audio_channels.get() != asset->channels ()) {
  99                                 throw DCPError (_("Mismatched audio channel counts in DCP"));
 100                         }
 101
 102                         if (!_audio_frame_rate) {
 103                                 _audio_frame_rate = asset->sampling_rate ();
 104                         } else if (_audio_frame_rate.get() != asset->sampling_rate ()) {
 105                                 throw DCPError (_("Mismatched audio sample rates in DCP"));
 106                         }
 107
 108                         _audio_length += (*i)->main_sound()->duration();
 109                 }
 110
 111                 if ((*i)->main_subtitle ()) {
 112                         _has_subtitles = true;
 113                 }
 114         }
 115
 116         _encrypted = dcp.encrypted ();
 117         _kdm_valid = true;
 118
 119         /* Check that we can read the first picture frame */
 120         try {
 121                 if (!dcp.cpls().empty () && !dcp.cpls().front()->reels().empty ()) {
 122                         shared_ptr<dcp::PictureAsset> asset = dcp.cpls().front()->reels().front()->main_picture()->asset ();
 123                         shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 124                         shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 125
 126                         if (mono) {
 127                                 mono->start_read()->get_frame(0)->xyz_image ();
 128                         } else {
 129                                 stereo->start_read()->get_frame(0)->xyz_image (dcp::EYE_LEFT);
 130                         }
 131
 132                 }
 133         } catch (dcp::DCPReadError& e) {
 134                 _kdm_valid = false;
 135                 if (_encrypted && content->kdm ()) {
 136                         /* XXX: maybe don't use an exception for this */
 137                         throw runtime_error (_("The KDM does not decrypt the DCP.  Perhaps it is targeted at the wrong CPL."));
 138                 }
 139         }
 140
 141         _standard = dcp.standard ();
 142 }