src/lib/frame_info.cc

   1 /*
   2     Copyright (C) 2024 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
  22 #include "frame_info.h"
  23 #include <string>
  24
  25
  26 using std::shared_ptr;
  27 using std::string;
  28
  29
  30 J2KFrameInfo::J2KFrameInfo(uint64_t offset_, uint64_t size_, string hash_)
  31         : dcp::J2KFrameInfo(offset_, size_, hash_)
  32 {
  33
  34 }
  35
  36
  37 J2KFrameInfo::J2KFrameInfo(dcp::J2KFrameInfo const& info)
  38         : dcp::J2KFrameInfo(info)
  39 {
  40
  41 }
  42
  43
  44 J2KFrameInfo::J2KFrameInfo(shared_ptr<InfoFileHandle> info_file, Frame frame, Eyes eyes)
  45 {
  46         info_file->get().seek(position(frame, eyes), SEEK_SET);
  47         info_file->get().checked_read(&offset, sizeof(offset));
  48         info_file->get().checked_read(&size, sizeof(size));
  49
  50         char hash_buffer[33];
  51         info_file->get().checked_read(hash_buffer, 32);
  52         hash_buffer[32] = '\0';
  53         hash = hash_buffer;
  54 }
  55
  56
  57 long
  58 J2KFrameInfo::position(Frame frame, Eyes eyes) const
  59 {
  60         switch (eyes) {
  61         case Eyes::BOTH:
  62                 return frame * _size_on_disk;
  63         case Eyes::LEFT:
  64                 return frame * _size_on_disk * 2;
  65         case Eyes::RIGHT:
  66                 return frame * _size_on_disk * 2 + _size_on_disk;
  67         default:
  68                 DCPOMATIC_ASSERT(false);
  69         }
  70
  71         DCPOMATIC_ASSERT(false);
  72 }
  73
  74
  75 /** @param frame reel-relative frame */
  76 void
  77 J2KFrameInfo::write(shared_ptr<InfoFileHandle> info_file, Frame frame, Eyes eyes) const
  78 {
  79         info_file->get().seek(position(frame, eyes), SEEK_SET);
  80         info_file->get().checked_write(&offset, sizeof(offset));
  81         info_file->get().checked_write(&size, sizeof(size));
  82         info_file->get().checked_write(hash.c_str(), hash.size());
  83 }
  84