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
  21 using boost::shared_ptr;
  22
  23 namespace dcp {
  24
  25 struct ASDCPStateBase
  26 {
  27         ASDCPStateBase ()
  28                 : frame_buffer (4 * Kumu::Megabyte)
  29         {}
  30
  31         ASDCP::JP2K::CodestreamParser j2k_parser;
  32         ASDCP::JP2K::FrameBuffer frame_buffer;
  33         ASDCP::WriterInfo writer_info;
  34         ASDCP::JP2K::PictureDescriptor picture_descriptor;
  35 };
  36
  37 }
  38
  39 template <class P, class Q>
  40 void dcp::start (PictureAssetWriter* writer, shared_ptr<P> state, Standard standard, Q* asset, uint8_t* data, int size)
  41 {
  42         asset->set_file (writer->_file);
  43
  44         if (ASDCP_FAILURE (state->j2k_parser.OpenReadFrame (data, size, state->frame_buffer))) {
  45                 boost::throw_exception (MiscError ("could not parse J2K frame"));
  46         }
  47
  48         state->j2k_parser.FillPictureDescriptor (state->picture_descriptor);
  49         state->picture_descriptor.EditRate = ASDCP::Rational (asset->edit_rate().numerator, asset->edit_rate().denominator);
  50
  51         asset->set_size (Size (state->picture_descriptor.StoredWidth, state->picture_descriptor.StoredHeight));
  52         asset->set_screen_aspect_ratio (Fraction (state->picture_descriptor.AspectRatio.Numerator, state->picture_descriptor.AspectRatio.Denominator));
  53
  54         asset->fill_writer_info (&state->writer_info, asset->id(), standard);
  55
  56         Kumu::Result_t r = state->mxf_writer.OpenWrite (
  57                 asset->file().string().c_str(),
  58                 state->writer_info,
  59                 state->picture_descriptor,
  60                 16384,
  61                 writer->_overwrite
  62                 );
  63
  64         if (ASDCP_FAILURE (r)) {
  65                 boost::throw_exception (MXFFileError ("could not open MXF file for writing", asset->file().string(), r));
  66         }
  67
  68         writer->_started = true;
  69 }