src/lib/video_mxf_decoder.cc

   1 /*
   2     Copyright (C) 2016-2021 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 "video_mxf_decoder.h"
  23 #include "video_decoder.h"
  24 #include "video_mxf_content.h"
  25 #include "j2k_image_proxy.h"
  26 #include "frame_interval_checker.h"
  27 #include <dcp/mono_picture_asset.h>
  28 #include <dcp/mono_picture_asset_reader.h>
  29 #include <dcp/stereo_picture_asset.h>
  30 #include <dcp/stereo_picture_asset_reader.h>
  31 #include <dcp/exceptions.h>
  32
  33
  34 using std::make_shared;
  35 using std::shared_ptr;
  36 using boost::optional;
  37 using namespace dcpomatic;
  38
  39
  40 VideoMXFDecoder::VideoMXFDecoder (shared_ptr<const Film> film, shared_ptr<const VideoMXFContent> content)
  41         : Decoder (film)
  42         , _content (content)
  43 {
  44         video = make_shared<VideoDecoder>(this, content);
  45
  46         shared_ptr<dcp::MonoPictureAsset> mono;
  47         try {
  48                 mono = make_shared<dcp::MonoPictureAsset>(_content->path(0));
  49         } catch (dcp::MXFFileError& e) {
  50                 /* maybe it's stereo */
  51         } catch (dcp::ReadError& e) {
  52                 /* maybe it's stereo */
  53         }
  54
  55         shared_ptr<dcp::StereoPictureAsset> stereo;
  56         try {
  57                 stereo = make_shared<dcp::StereoPictureAsset>(_content->path(0));
  58         } catch (dcp::MXFFileError& e) {
  59                 if (!mono) {
  60                         throw;
  61                 }
  62         } catch (dcp::ReadError& e) {
  63                 if (!mono) {
  64                         throw;
  65                 }
  66         }
  67
  68         if (mono) {
  69                 _mono_reader = mono->start_read ();
  70                 _size = mono->size ();
  71         } else {
  72                 _stereo_reader = stereo->start_read ();
  73                 _size = stereo->size ();
  74         }
  75 }
  76
  77
  78 bool
  79 VideoMXFDecoder::pass ()
  80 {
  81         auto const vfr = _content->active_video_frame_rate (film());
  82         auto const frame = _next.frames_round (vfr);
  83
  84         if (frame >= _content->video->length()) {
  85                 return true;
  86         }
  87
  88         if (_mono_reader) {
  89                 video->emit (
  90                         film(),
  91                         std::make_shared<J2KImageProxy>(_mono_reader->get_frame(frame), _size, AV_PIX_FMT_XYZ12LE, optional<int>()),
  92                         frame
  93                         );
  94         } else {
  95                 video->emit (
  96                         film(),
  97                         std::make_shared<J2KImageProxy>(_stereo_reader->get_frame(frame), _size, dcp::Eye::LEFT, AV_PIX_FMT_XYZ12LE, optional<int>()),
  98                         frame
  99                         );
 100                 video->emit (
 101                         film(),
 102                         std::make_shared<J2KImageProxy>(_stereo_reader->get_frame(frame), _size, dcp::Eye::RIGHT, AV_PIX_FMT_XYZ12LE, optional<int>()),
 103                         frame
 104                         );
 105         }
 106
 107         _next += ContentTime::from_frames (1, vfr);
 108         return false;
 109 }
 110
 111
 112 void
 113 VideoMXFDecoder::seek (ContentTime t, bool accurate)
 114 {
 115         Decoder::seek (t, accurate);
 116         _next = t;
 117 }