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diff --git a/libavcodec/jpeg2000dwt.h b/libavcodec/jpeg2000dwt.h
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+/*
+ * Discrete wavelet transform
+ * Copyright (c) 2007 Kamil Nowosad
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_JPEG2000DWT_H
+#define AVCODEC_JPEG2000DWT_H
+
+/**
+ * @file
+ * Discrete wavelet transform
+ */
+
+#include <stdint.h>
+
+#define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels
+
+enum DWTType {
+    FF_DWT97,
+    FF_DWT53,
+    FF_DWT97_INT
+};
+
+typedef struct DWTContext {
+    /// 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
+    int32_t *i_linebuf;                  ///< int buffer used by transform
+    float   *f_linebuf;                  ///< float buffer used by transform
+} 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_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2],
+                         int decomp_levels, int type);
+
+int ff_dwt_decode(DWTContext *s, void *t);
+
+void ff_dwt_destroy(DWTContext *s);
+
+#endif /* AVCODEC_JPEG2000DWT_H */