src/lib/image_decoder.cc

   1 /*
   2     Copyright (C) 2012-2021 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 "exceptions.h"
  23 #include "ffmpeg_image_proxy.h"
  24 #include "film.h"
  25 #include "frame_interval_checker.h"
  26 #include "image.h"
  27 #include "image_content.h"
  28 #include "image_decoder.h"
  29 #include "j2k_image_proxy.h"
  30 #include "util.h"
  31 #include "video_content.h"
  32 #include "video_decoder.h"
  33 #include <boost/filesystem.hpp>
  34 #include <iostream>
  35
  36 #include "i18n.h"
  37
  38
  39 using std::cout;
  40 using std::make_shared;
  41 using std::shared_ptr;
  42 using dcp::Size;
  43 using namespace dcpomatic;
  44
  45
  46 ImageDecoder::ImageDecoder (shared_ptr<const Film> film, shared_ptr<const ImageContent> c)
  47         : Decoder (film)
  48         , _image_content (c)
  49 {
  50         video = make_shared<VideoDecoder>(this, c);
  51 }
  52
  53
  54 bool
  55 ImageDecoder::pass ()
  56 {
  57         if (_frame_video_position >= _image_content->video->length()) {
  58                 return true;
  59         }
  60
  61         if (!_image_content->still() || !_image) {
  62                 /* Either we need an image or we are using moving images, so load one */
  63                 auto path = _image_content->path (_image_content->still() ? 0 : _frame_video_position);
  64                 if (valid_j2k_file (path)) {
  65                         AVPixelFormat pf;
  66                         if (_image_content->video->colour_conversion()) {
  67                                 /* We have a specified colour conversion: assume the image is RGB */
  68                                 pf = AV_PIX_FMT_RGB48LE;
  69                         } else {
  70                                 /* No specified colour conversion: assume the image is XYZ */
  71                                 pf = AV_PIX_FMT_XYZ12LE;
  72                         }
  73                         /* We can't extract image size from a JPEG2000 codestream without decoding it,
  74                            so pass in the image content's size here.
  75                         */
  76                         auto size = _image_content->video->size();
  77                         DCPOMATIC_ASSERT(size);
  78                         _image = make_shared<J2KImageProxy>(path, *size, pf);
  79                 } else {
  80                         _image = make_shared<FFmpegImageProxy>(path);
  81                 }
  82         }
  83
  84         video->emit (film(), _image, _frame_video_position);
  85         ++_frame_video_position;
  86         return false;
  87 }
  88
  89
  90 void
  91 ImageDecoder::seek (ContentTime time, bool accurate)
  92 {
  93         Decoder::seek (time, accurate);
  94         _frame_video_position = time.frames_round (_image_content->active_video_frame_rate(film()));
  95 }