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