2 Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of libdcp.
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.
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.
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/>.
19 In addition, as a special exception, the copyright holders give
20 permission to link the code of portions of this program with the
21 OpenSSL library under certain conditions as described in each
22 individual source file, and distribute linked combinations
25 You must obey the GNU General Public License in all respects
26 for all of the code used other than OpenSSL. If you modify
27 file(s) with this exception, you may extend this exception to your
28 version of the file(s), but you are not obligated to do so. If you
29 do not wish to do so, delete this exception statement from your
30 version. If you delete this exception statement from all source
31 files in the program, then also delete it here.
35 /** @file src/j2k_transcode.h
36 * @brief Methods to encode and decode JPEG2000
40 #include "array_data.h"
51 /** Decompress a JPEG2000 image to a bitmap
52 * @param data JPEG2000 data
53 * @param size Size of data in bytes
54 * @param reduce A power of 2 by which to reduce the size of the decoded image;
55 * e.g. 0 reduces by (2^0 == 1), ie keeping the same size.
56 * 1 reduces by (2^1 == 2), ie halving the size of the image.
57 * This is useful for scaling 4K DCP images down to 2K.
58 * @return OpenJPEGImage
60 extern std::shared_ptr<OpenJPEGImage> decompress_j2k (uint8_t const * data, int64_t size, int reduce);
62 extern std::shared_ptr<OpenJPEGImage> decompress_j2k (Data const& data, int reduce);
63 extern std::shared_ptr<OpenJPEGImage> decompress_j2k (std::shared_ptr<const Data> data, int reduce);
65 /** @xyz Picture to compress. Parts of xyz's data WILL BE OVERWRITTEN by libopenjpeg so xyz cannot be re-used
66 * after this call; see opj_j2k_encode where if l_reuse_data is false it will set l_tilec->data = l_img_comp->data.
68 extern ArrayData compress_j2k (std::shared_ptr<const OpenJPEGImage>, int bandwidth, int frames_per_second, bool threed, bool fourk, std::string comment = "libdcp");