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 using namespace dcpomatic;
  34
  35 VideoMXFDecoder::VideoMXFDecoder (shared_ptr<const Film> film, shared_ptr<const VideoMXFContent> content)
  36         : Decoder (film)
  37         , _content (content)
  38 {
  39         video.reset (new VideoDecoder (this, content));
  40
  41         shared_ptr<dcp::MonoPictureAsset> mono;
  42         try {
  43                 mono.reset (new dcp::MonoPictureAsset (_content->path(0)));
  44         } catch (dcp::MXFFileError& e) {
  45                 /* maybe it's stereo */
  46         } catch (dcp::DCPReadError& e) {
  47                 /* maybe it's stereo */
  48         }
  49
  50         shared_ptr<dcp::StereoPictureAsset> stereo;
  51         try {
  52                 stereo.reset (new dcp::StereoPictureAsset (_content->path(0)));
  53         } catch (dcp::MXFFileError& e) {
  54                 if (!mono) {
  55                         throw;
  56                 }
  57         } catch (dcp::DCPReadError& e) {
  58                 if (!mono) {
  59                         throw;
  60                 }
  61         }
  62
  63         if (mono) {
  64                 _mono_reader = mono->start_read ();
  65                 _size = mono->size ();
  66         } else {
  67                 _stereo_reader = stereo->start_read ();
  68                 _size = stereo->size ();
  69         }
  70 }
  71
  72 bool
  73 VideoMXFDecoder::pass ()
  74 {
  75         double const vfr = _content->active_video_frame_rate (film());
  76         int64_t const frame = _next.frames_round (vfr);
  77
  78
  79         if (frame >= _content->video->length()) {
  80                 return true;
  81         }
  82
  83         if (_mono_reader) {
  84                 video->emit (
  85                         film(),
  86                         shared_ptr<ImageProxy> (
  87                                 new J2KImageProxy (_mono_reader->get_frame(frame), _size, AV_PIX_FMT_XYZ12LE, optional<int>())
  88                                 ),
  89                         frame
  90                         );
  91         } else {
  92                 video->emit (
  93                         film(),
  94                         shared_ptr<ImageProxy> (
  95                                 new J2KImageProxy (_stereo_reader->get_frame(frame), _size, dcp::EYE_LEFT, AV_PIX_FMT_XYZ12LE, optional<int>())
  96                                 ),
  97                         frame
  98                         );
  99                 video->emit (
 100                         film(),
 101                         shared_ptr<ImageProxy> (
 102                                 new J2KImageProxy (_stereo_reader->get_frame(frame), _size, dcp::EYE_RIGHT, AV_PIX_FMT_XYZ12LE, optional<int>())
 103                                 ),
 104                         frame
 105                         );
 106         }
 107
 108         _next += ContentTime::from_frames (1, vfr);
 109         return false;
 110 }
 111
 112 void
 113 VideoMXFDecoder::seek (ContentTime t, bool accurate)
 114 {
 115         Decoder::seek (t, accurate);
 116         _next = t;
 117 }