src/lib/dcp_examiner.cc

   1 /*
   2     Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include "dcp_examiner.h"
  21 #include "dcp_content.h"
  22 #include "exceptions.h"
  23 #include "image.h"
  24 #include "config.h"
  25 #include <dcp/dcp.h>
  26 #include <dcp/cpl.h>
  27 #include <dcp/reel.h>
  28 #include <dcp/reel_picture_asset.h>
  29 #include <dcp/reel_sound_asset.h>
  30 #include <dcp/mono_picture_asset.h>
  31 #include <dcp/mono_picture_frame.h>
  32 #include <dcp/stereo_picture_asset.h>
  33 #include <dcp/stereo_picture_frame.h>
  34 #include <dcp/sound_asset.h>
  35
  36 #include "i18n.h"
  37
  38 using std::list;
  39 using std::cout;
  40 using boost::shared_ptr;
  41 using boost::dynamic_pointer_cast;
  42
  43 DCPExaminer::DCPExaminer (shared_ptr<const DCPContent> content)
  44         : _video_length (0)
  45         , _audio_length (0)
  46         , _has_subtitles (false)
  47         , _encrypted (false)
  48         , _kdm_valid (false)
  49 {
  50         dcp::DCP dcp (content->directory ());
  51         dcp.read ();
  52
  53         if (content->kdm ()) {
  54                 dcp.add (dcp::DecryptedKDM (content->kdm().get(), Config::instance()->decryption_chain()->key().get ()));
  55         }
  56
  57         if (dcp.cpls().size() == 0) {
  58                 throw DCPError ("No CPLs found in DCP");
  59         } else if (dcp.cpls().size() > 1) {
  60                 throw DCPError ("Multiple CPLs found in DCP");
  61         }
  62
  63         _name = dcp.cpls().front()->content_title_text ();
  64
  65         list<shared_ptr<dcp::Reel> > reels = dcp.cpls().front()->reels ();
  66         for (list<shared_ptr<dcp::Reel> >::const_iterator i = reels.begin(); i != reels.end(); ++i) {
  67
  68                 if ((*i)->main_picture ()) {
  69                         dcp::Fraction const frac = (*i)->main_picture()->frame_rate ();
  70                         float const fr = float(frac.numerator) / frac.denominator;
  71                         if (!_video_frame_rate) {
  72                                 _video_frame_rate = fr;
  73                         } else if (_video_frame_rate.get() != fr) {
  74                                 throw DCPError (_("Mismatched frame rates in DCP"));
  75                         }
  76
  77                         shared_ptr<dcp::PictureAsset> asset = (*i)->main_picture()->asset ();
  78                         if (!_video_size) {
  79                                 _video_size = asset->size ();
  80                         } else if (_video_size.get() != asset->size ()) {
  81                                 throw DCPError (_("Mismatched video sizes in DCP"));
  82                         }
  83
  84                         _video_length += (*i)->main_picture()->duration();
  85                 }
  86
  87                 if ((*i)->main_sound ()) {
  88                         shared_ptr<dcp::SoundAsset> asset = (*i)->main_sound()->asset ();
  89
  90                         if (!_audio_channels) {
  91                                 _audio_channels = asset->channels ();
  92                         } else if (_audio_channels.get() != asset->channels ()) {
  93                                 throw DCPError (_("Mismatched audio channel counts in DCP"));
  94                         }
  95
  96                         if (!_audio_frame_rate) {
  97                                 _audio_frame_rate = asset->sampling_rate ();
  98                         } else if (_audio_frame_rate.get() != asset->sampling_rate ()) {
  99                                 throw DCPError (_("Mismatched audio frame rates in DCP"));
 100                         }
 101
 102                         _audio_length += (*i)->main_sound()->duration();
 103                 }
 104
 105                 if ((*i)->main_subtitle ()) {
 106                         _has_subtitles = true;
 107                 }
 108         }
 109
 110         _encrypted = dcp.encrypted ();
 111         _kdm_valid = true;
 112
 113         /* Check that we can read the first picture frame */
 114         try {
 115                 if (!dcp.cpls().empty () && !dcp.cpls().front()->reels().empty ()) {
 116                         shared_ptr<dcp::PictureAsset> asset = dcp.cpls().front()->reels().front()->main_picture()->asset ();
 117                         shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 118                         shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 119
 120                         if (mono) {
 121                                 mono->get_frame(0)->xyz_image ();
 122                         } else {
 123                                 stereo->get_frame(0)->xyz_image (dcp::EYE_LEFT);
 124                         }
 125
 126                 }
 127         } catch (dcp::DCPReadError& e) {
 128                 _kdm_valid = false;
 129                 if (_encrypted && content->kdm ()) {
 130                         /* XXX: maybe don't use an exception for this */
 131                         throw StringError (_("The KDM does not decrypt the DCP.  Perhaps it is targeted at the wrong CPL."));
 132                 }
 133         }
 134 }