src/lib/video_mxf_decoder.cc

   1 /*
   2     Copyright (C) 2016-2017 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 "video_mxf_decoder.h"
  22 #include "video_decoder.h"
  23 #include "video_mxf_content.h"
  24 #include "j2k_image_proxy.h"
  25 #include <dcp/mono_picture_asset.h>
  26 #include <dcp/mono_picture_asset_reader.h>
  27 #include <dcp/stereo_picture_asset.h>
  28 #include <dcp/stereo_picture_asset_reader.h>
  29 #include <dcp/exceptions.h>
  30
  31 using boost::shared_ptr;
  32 using boost::optional;
  33
  34 VideoMXFDecoder::VideoMXFDecoder (shared_ptr<const Film> film, shared_ptr<const VideoMXFContent> content)
  35         : Decoder (film)
  36         , _content (content)
  37 {
  38         video.reset (new VideoDecoder (this, content));
  39
  40         shared_ptr<dcp::MonoPictureAsset> mono;
  41         try {
  42                 mono.reset (new dcp::MonoPictureAsset (_content->path(0)));
  43         } catch (dcp::MXFFileError& e) {
  44                 /* maybe it's stereo */
  45         } catch (dcp::DCPReadError& e) {
  46                 /* maybe it's stereo */
  47         }
  48
  49         shared_ptr<dcp::StereoPictureAsset> stereo;
  50         try {
  51                 stereo.reset (new dcp::StereoPictureAsset (_content->path(0)));
  52         } catch (dcp::MXFFileError& e) {
  53                 if (!mono) {
  54                         throw;
  55                 }
  56         } catch (dcp::DCPReadError& e) {
  57                 if (!mono) {
  58                         throw;
  59                 }
  60         }
  61
  62         if (mono) {
  63                 _mono_reader = mono->start_read ();
  64                 _size = mono->size ();
  65         } else {
  66                 _stereo_reader = stereo->start_read ();
  67                 _size = stereo->size ();
  68         }
  69 }
  70
  71 bool
  72 VideoMXFDecoder::pass ()
  73 {
  74         double const vfr = _content->active_video_frame_rate (film());
  75         int64_t const frame = _next.frames_round (vfr);
  76
  77
  78         if (frame >= _content->video->length()) {
  79                 return true;
  80         }
  81
  82         if (_mono_reader) {
  83                 video->emit (
  84                         film(),
  85                         shared_ptr<ImageProxy> (
  86                                 new J2KImageProxy (_mono_reader->get_frame(frame), _size, AV_PIX_FMT_XYZ12LE, optional<int>())
  87                                 ),
  88                         frame
  89                         );
  90         } else {
  91                 video->emit (
  92                         film(),
  93                         shared_ptr<ImageProxy> (
  94                                 new J2KImageProxy (_stereo_reader->get_frame(frame), _size, dcp::EYE_LEFT, AV_PIX_FMT_XYZ12LE, optional<int>())
  95                                 ),
  96                         frame
  97                         );
  98                 video->emit (
  99                         film(),
 100                         shared_ptr<ImageProxy> (
 101                                 new J2KImageProxy (_stereo_reader->get_frame(frame), _size, dcp::EYE_RIGHT, AV_PIX_FMT_XYZ12LE, optional<int>())
 102                                 ),
 103                         frame
 104                         );
 105         }
 106
 107         _next += ContentTime::from_frames (1, vfr);
 108         return false;
 109 }
 110
 111 void
 112 VideoMXFDecoder::seek (ContentTime t, bool accurate)
 113 {
 114         Decoder::seek (t, accurate);
 115         _next = t;
 116 }