Add Kamil Nowosads j2k code.

This needs work but it should not rot in soc svn.

1 files changed, 63 insertions, 0 deletions

diff --git a/libavcodec/j2k_dwt.h b/libavcodec/j2k_dwt.h
new file mode 100644
index 0000000000..a2a25a6891
--- /dev/null
+++ b/libavcodec/j2k_dwt.h
@@ -0,0 +1,63 @@
+/*
+ * Discrete wavelet transform
+ * Copyright (c) 2007 Kamil Nowosad
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_DWT_H
+#define AVCODEC_DWT_H
+
+/**
+ * Discrete wavelet transform
+ * @file
+ * @author Kamil Nowosad
+ */
+
+#include "avcodec.h"
+
+#define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels
+
+enum DWTType{
+    FF_DWT97,
+    FF_DWT53
+};
+
+typedef struct {
+    ///line lengths {horizontal, vertical} in consecutive decomposition levels
+    uint16_t linelen[FF_DWT_MAX_DECLVLS][2];
+    uint8_t  mod[FF_DWT_MAX_DECLVLS][2]; ///< coordinates (x0, y0) of decomp. levels mod 2
+    uint8_t  ndeclevels;                 ///< number of decomposition levels
+    uint8_t  type;                       ///< 0 for 9/7; 1 for 5/3
+    void     *linebuf;                   ///< buffer used by transform (int or float)
+} DWTContext;
+
+/**
+ * initialize DWT
+ * @param s DWT context
+ * @param border coordinates of transformed region {{x0, x1}, {y0, y1}}
+ * @param decomp_levels number of decomposition levels
+ * @param type 0 for DWT 9/7; 1 for DWT 5/3
+ */
+int ff_j2k_dwt_init(DWTContext *s, uint16_t border[2][2], int decomp_levels, int type);
+
+int ff_j2k_dwt_encode(DWTContext *s, int *t);
+int ff_j2k_dwt_decode(DWTContext *s, int *t);
+
+void ff_j2k_dwt_destroy(DWTContext *s);
+
+#endif /* AVCODEC_DWT_H */