Rename j2k.{cc,h} => j2k_transcode.{cc,h}

1 files changed, 70 insertions, 0 deletions

diff --git a/src/j2k_transcode.h b/src/j2k_transcode.h
new file mode 100644
index 00000000..0687706d
--- /dev/null
+++ b/src/j2k_transcode.h
@@ -0,0 +1,70 @@
+/*
+    Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
+
+    This file is part of libdcp.
+
+    libdcp is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    libdcp is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with libdcp.  If not, see <http://www.gnu.org/licenses/>.
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of portions of this program with the
+    OpenSSL library under certain conditions as described in each
+    individual source file, and distribute linked combinations
+    including the two.
+
+    You must obey the GNU General Public License in all respects
+    for all of the code used other than OpenSSL.  If you modify
+    file(s) with this exception, you may extend this exception to your
+    version of the file(s), but you are not obligated to do so.  If you
+    do not wish to do so, delete this exception statement from your
+    version.  If you delete this exception statement from all source
+    files in the program, then also delete it here.
+*/
+
+
+/** @file  src/j2k_transcode.h
+ *  @brief Methods to encode and decode JPEG2000
+ */
+
+
+#include "array_data.h"
+#include <memory>
+#include <stdint.h>
+
+
+namespace dcp {
+
+
+class OpenJPEGImage;
+
+
+extern std::shared_ptr<OpenJPEGImage> decompress_j2k (uint8_t* data, int64_t size, int reduce);
+
+/** Decompress a JPEG2000 image to a bitmap
+ *  @param data JPEG2000 data
+ *  @param size Size of data in bytes
+ *  @param reduce A power of 2 by which to reduce the size of the decoded image;
+ *  e.g. 0 reduces by (2^0 == 1), ie keeping the same size.
+ *       1 reduces by (2^1 == 2), ie halving the size of the image.
+ *  This is useful for scaling 4K DCP images down to 2K.
+ *  @return OpenJPEGImage
+ */
+extern std::shared_ptr<OpenJPEGImage> decompress_j2k (ArrayData data, int reduce);
+
+/** @xyz Picture to compress.  Parts of xyz's data WILL BE OVERWRITTEN by libopenjpeg so xyz cannot be re-used
+ *  after this call; see opj_j2k_encode where if l_reuse_data is false it will set l_tilec->data = l_img_comp->data.
+ */
+extern ArrayData compress_j2k (std::shared_ptr<const OpenJPEGImage>, int bandwith, int frames_per_second, bool threed, bool fourk, std::string comment = "libdcp");
+
+
+}