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 "frame_interval_checker.h"
  26 #include <dcp/mono_picture_asset.h>
  27 #include <dcp/mono_picture_asset_reader.h>
  28 #include <dcp/stereo_picture_asset.h>
  29 #include <dcp/stereo_picture_asset_reader.h>
  30 #include <dcp/exceptions.h>
  31
  32 using boost::shared_ptr;
  33 using boost::optional;
  34 using namespace dcpomatic;
  35
  36 VideoMXFDecoder::VideoMXFDecoder (shared_ptr<const Film> film, shared_ptr<const VideoMXFContent> content)
  37         : Decoder (film)
  38         , _content (content)
  39 {
  40         video.reset (new VideoDecoder (this, content));
  41
  42         shared_ptr<dcp::MonoPictureAsset> mono;
  43         try {
  44                 mono.reset (new dcp::MonoPictureAsset (_content->path(0)));
  45         } catch (dcp::MXFFileError& e) {
  46                 /* maybe it's stereo */
  47         } catch (dcp::DCPReadError& e) {
  48                 /* maybe it's stereo */
  49         }
  50
  51         shared_ptr<dcp::StereoPictureAsset> stereo;
  52         try {
  53                 stereo.reset (new dcp::StereoPictureAsset (_content->path(0)));
  54         } catch (dcp::MXFFileError& e) {
  55                 if (!mono) {
  56                         throw;
  57                 }
  58         } catch (dcp::DCPReadError& e) {
  59                 if (!mono) {
  60                         throw;
  61                 }
  62         }
  63
  64         if (mono) {
  65                 _mono_reader = mono->start_read ();
  66                 _size = mono->size ();
  67         } else {
  68                 _stereo_reader = stereo->start_read ();
  69                 _size = stereo->size ();
  70         }
  71 }
  72
  73 bool
  74 VideoMXFDecoder::pass ()
  75 {
  76         double const vfr = _content->active_video_frame_rate (film());
  77         int64_t const frame = _next.frames_round (vfr);
  78
  79
  80         if (frame >= _content->video->length()) {
  81                 return true;
  82         }
  83
  84         if (_mono_reader) {
  85                 video->emit (
  86                         film(),
  87                         shared_ptr<ImageProxy> (
  88                                 new J2KImageProxy (_mono_reader->get_frame(frame), _size, AV_PIX_FMT_XYZ12LE, optional<int>())
  89                                 ),
  90                         frame
  91                         );
  92         } else {
  93                 video->emit (
  94                         film(),
  95                         shared_ptr<ImageProxy> (
  96                                 new J2KImageProxy (_stereo_reader->get_frame(frame), _size, dcp::EYE_LEFT, AV_PIX_FMT_XYZ12LE, optional<int>())
  97                                 ),
  98                         frame
  99                         );
 100                 video->emit (
 101                         film(),
 102                         shared_ptr<ImageProxy> (
 103                                 new J2KImageProxy (_stereo_reader->get_frame(frame), _size, dcp::EYE_RIGHT, AV_PIX_FMT_XYZ12LE, optional<int>())
 104                                 ),
 105                         frame
 106                         );
 107         }
 108
 109         _next += ContentTime::from_frames (1, vfr);
 110         return false;
 111 }
 112
 113 void
 114 VideoMXFDecoder::seek (ContentTime t, bool accurate)
 115 {
 116         Decoder::seek (t, accurate);
 117         _next = t;
 118 }