src/picture_asset_writer_common.cc

   1 /*
   2     Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of libdcp.
   5
   6     libdcp 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     libdcp 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 libdcp.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 using boost::shared_ptr;
  21
  22 namespace dcp {
  23
  24 struct ASDCPStateBase
  25 {
  26         ASDCPStateBase ()
  27                 : frame_buffer (4 * Kumu::Megabyte)
  28         {}
  29
  30         ASDCP::JP2K::CodestreamParser j2k_parser;
  31         ASDCP::JP2K::FrameBuffer frame_buffer;
  32         ASDCP::WriterInfo writer_info;
  33         ASDCP::JP2K::PictureDescriptor picture_descriptor;
  34 };
  35
  36 }
  37
  38 template <class P, class Q>
  39 void dcp::start (PictureAssetWriter* writer, shared_ptr<P> state, Standard standard, Q* asset, uint8_t* data, int size)
  40 {
  41         asset->set_file (writer->_file);
  42
  43         if (ASDCP_FAILURE (state->j2k_parser.OpenReadFrame (data, size, state->frame_buffer))) {
  44                 boost::throw_exception (MiscError ("could not parse J2K frame"));
  45         }
  46
  47         state->j2k_parser.FillPictureDescriptor (state->picture_descriptor);
  48         state->picture_descriptor.EditRate = ASDCP::Rational (asset->edit_rate().numerator, asset->edit_rate().denominator);
  49
  50         asset->set_size (Size (state->picture_descriptor.StoredWidth, state->picture_descriptor.StoredHeight));
  51         asset->set_screen_aspect_ratio (Fraction (state->picture_descriptor.AspectRatio.Numerator, state->picture_descriptor.AspectRatio.Denominator));
  52
  53         asset->fill_writer_info (&state->writer_info, asset->id(), standard);
  54
  55         Kumu::Result_t r = state->mxf_writer.OpenWrite (
  56                 asset->file().string().c_str(),
  57                 state->writer_info,
  58                 state->picture_descriptor,
  59                 16384,
  60                 writer->_overwrite
  61                 );
  62
  63         if (ASDCP_FAILURE (r)) {
  64                 boost::throw_exception (MXFFileError ("could not open MXF file for writing", asset->file().string(), r));
  65         }
  66
  67         writer->_started = true;
  68 }