2 Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/mono_picture_frame.cc
21 * @brief MonoPictureFrame class.
24 #include "mono_picture_frame.h"
25 #include "exceptions.h"
26 #include "argb_image.h"
29 #include "colour_conversion.h"
30 #include "KM_fileio.h"
37 using boost::shared_ptr;
38 using boost::optional;
41 /** Make a picture frame from a JPEG2000 file.
42 * @param path Path to JPEG2000 file.
44 MonoPictureFrame::MonoPictureFrame (boost::filesystem::path path)
46 boost::uintmax_t const size = boost::filesystem::file_size (path);
47 _buffer = new ASDCP::JP2K::FrameBuffer (size);
48 FILE* f = fopen_boost (path, "r");
50 boost::throw_exception (FileError ("could not open JPEG2000 file", path, errno));
53 fread (j2k_data(), 1, size, f);
59 /** Make a picture frame from a 2D (monoscopic) asset.
60 * @param mxf_path Path to the asset's MXF file.
61 * @param n Frame within the asset, not taking EntryPoint into account.
62 * @param c Context for decryption, or 0.
64 MonoPictureFrame::MonoPictureFrame (boost::filesystem::path mxf_path, int n, ASDCP::AESDecContext* c)
66 ASDCP::JP2K::MXFReader reader;
67 Kumu::Result_t r = reader.OpenRead (mxf_path.string().c_str());
68 if (ASDCP_FAILURE (r)) {
69 boost::throw_exception (FileError ("could not open MXF file for reading", mxf_path, r));
72 /* XXX: unfortunate guesswork on this buffer size */
73 _buffer = new ASDCP::JP2K::FrameBuffer (4 * Kumu::Megabyte);
75 if (ASDCP_FAILURE (reader.ReadFrame (n, *_buffer, c))) {
76 boost::throw_exception (DCPReadError ("could not read video frame"));
80 MonoPictureFrame::MonoPictureFrame ()
82 _buffer = new ASDCP::JP2K::FrameBuffer (4 * Kumu::Megabyte);
85 /** MonoPictureFrame destructor */
86 MonoPictureFrame::~MonoPictureFrame ()
91 /** @return Pointer to JPEG2000 data */
93 MonoPictureFrame::j2k_data () const
95 return _buffer->RoData ();
98 /** @return Pointer to JPEG2000 data */
100 MonoPictureFrame::j2k_data ()
102 return _buffer->Data ();
105 /** @return Size of JPEG2000 data in bytes */
107 MonoPictureFrame::j2k_size () const
109 return _buffer->Size ();
112 /** @param reduce a factor by which to reduce the resolution
113 * of the image, expressed as a power of two (pass 0 for no
115 * @param srgb_gamma Reciprocal of output gamma to use after
116 * the conversion from XYZ to RGB.
118 * @return An ARGB representation of this frame. This is ARGB in the
119 * Cairo sense, so that each pixel takes up 4 bytes; the first byte
120 * is blue, second green, third red and fourth alpha (always 255).
122 shared_ptr<ARGBImage>
123 MonoPictureFrame::argb_image (int reduce) const
126 decompress_j2k (const_cast<uint8_t*> (_buffer->RoData()), _buffer->Size(), reduce),
127 ColourConversion::xyz_to_srgb ()
132 MonoPictureFrame::rgb_frame (shared_ptr<Image> rgb, optional<NoteHandler> note) const
135 decompress_j2k (const_cast<uint8_t*> (_buffer->RoData()), _buffer->Size(), 0),
136 ColourConversion::xyz_to_srgb (),