j2k/jpeg2000: merge j2k & jpeg2000 dwts, drop j2k dwt

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

9 files changed, 158 insertions, 457 deletions

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index cbcc587d65..ad42d1aebb 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -243,8 +243,8 @@ OBJS-$(CONFIG_INDEO5_DECODER)          += indeo5.o ivi_common.o ivi_dsp.o
 OBJS-$(CONFIG_INTERPLAY_DPCM_DECODER)  += dpcm.o
 OBJS-$(CONFIG_INTERPLAY_VIDEO_DECODER) += interplayvideo.o
 OBJS-$(CONFIG_JACOSUB_DECODER)         += jacosubdec.o ass.o
-OBJS-$(CONFIG_J2K_DECODER)             += j2kdec.o mqcdec.o mqc.o j2k.o j2k_dwt.o
-OBJS-$(CONFIG_J2K_ENCODER)             += j2kenc.o mqcenc.o mqc.o j2k.o j2k_dwt.o
+OBJS-$(CONFIG_J2K_DECODER)             += j2kdec.o mqcdec.o mqc.o j2k.o
+OBJS-$(CONFIG_J2K_ENCODER)             += j2kenc.o mqcenc.o mqc.o j2k.o
 OBJS-$(CONFIG_JPEG2000_DECODER)        += jpeg2000dec.o jpeg2000.o      \
                                           jpeg2000dwt.o mqcdec.o mqc.o
 OBJS-$(CONFIG_JPEGLS_DECODER)          += jpeglsdec.o jpegls.o \
diff --git a/libavcodec/j2k.c b/libavcodec/j2k.c
index 2eca8455d9..e352c4a02e 100644
--- a/libavcodec/j2k.c
+++ b/libavcodec/j2k.c
@@ -184,7 +184,7 @@ int ff_j2k_init_component(Jpeg2000Component *comp,
     uint8_t log2_band_prec_width, log2_band_prec_height;
     int reslevelno, bandno, gbandno = 0, ret, i, j, csize = 1;
 
-    if (ret=ff_j2k_dwt_init(&comp->dwt, comp->coord, codsty->nreslevels-1, codsty->transform))
+    if (ret=ff_jpeg2000_dwt_init(&comp->dwt, comp->coord, codsty->nreslevels-1, codsty->transform == FF_DWT53 ? FF_DWT53 : FF_DWT97_INT))
         return ret;
     for (i = 0; i < 2; i++)
         csize *= comp->coord[i][1] - comp->coord[i][0];
@@ -483,7 +483,7 @@ void ff_j2k_cleanup(Jpeg2000Component *comp, Jpeg2000CodingStyle *codsty)
         av_freep(&reslevel->band);
     }
 
-    ff_j2k_dwt_destroy(&comp->dwt);
+    ff_dwt_destroy(&comp->dwt);
     av_freep(&comp->reslevel);
     av_freep(&comp->data);
 }
diff --git a/libavcodec/j2k.h b/libavcodec/j2k.h
index 788f2fcf34..d5742e19e0 100644
--- a/libavcodec/j2k.h
+++ b/libavcodec/j2k.h
@@ -33,7 +33,7 @@
 
 #include "avcodec.h"
 #include "mqc.h"
-#include "j2k_dwt.h"
+#include "jpeg2000dwt.h"
 
 enum Jpeg2000Markers {
     JPEG2000_SOC = 0xff4f, // start of codestream
diff --git a/libavcodec/j2k_dwt.c b/libavcodec/j2k_dwt.c
deleted file mode 100644
index 8494ecd9fc..0000000000
--- a/libavcodec/j2k_dwt.c
+++ /dev/null
@@ -1,386 +0,0 @@
-/*
- * 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
- */
-
-/**
- * Discrete wavelet transform
- * @file
- * @author Kamil Nowosad
- */
-
-#include "j2k_dwt.h"
-
-static const float scale97[] = {1.625786, 1.230174};
-
-static inline void extend53(int *p, int i0, int i1)
-{
-    p[i0 - 1] = p[i0 + 1];
-    p[i1    ] = p[i1 - 2];
-    p[i0 - 2] = p[i0 + 2];
-    p[i1 + 1] = p[i1 - 3];
-}
-
-static inline void extend97(float *p, int i0, int i1)
-{
-    int i;
-
-    for (i = 1; i <= 4; i++){
-        p[i0 - i] = p[i0 + i];
-        p[i1 + i - 1] = p[i1 - i - 1];
-    }
-}
-
-static void sd_1d53(int *p, int i0, int i1)
-{
-    int i;
-
-    if (i1 == i0 + 1)
-        return;
-
-    extend53(p, i0, i1);
-
-    for (i = (i0+1)/2 - 1; i < (i1+1)/2; i++)
-        p[2*i+1] -= (p[2*i] + p[2*i+2]) >> 1;
-    for (i = (i0+1)/2; i < (i1+1)/2; i++)
-        p[2*i] += (p[2*i-1] + p[2*i+1] + 2) >> 2;
-}
-
-static void dwt_encode53(DWTContext *s, int *t)
-{
-    int lev,
-        w = s->linelen[s->ndeclevels-1][0];
-    int *line = s->linebuf;
-    line += 3;
-
-    for (lev = s->ndeclevels-1; lev >= 0; lev--){
-        int lh = s->linelen[lev][0],
-            lv = s->linelen[lev][1],
-            mh = s->mod[lev][0],
-            mv = s->mod[lev][1],
-            lp;
-        int *l;
-
-        // HOR_SD
-        l = line + mh;
-        for (lp = 0; lp < lv; lp++){
-            int i, j = 0;
-
-            for (i = 0; i < lh; i++)
-                l[i] = t[w*lp + i];
-
-            sd_1d53(line, mh, mh + lh);
-
-            // copy back and deinterleave
-            for (i =   mh; i < lh; i+=2, j++)
-                t[w*lp + j] = l[i];
-            for (i = 1-mh; i < lh; i+=2, j++)
-                t[w*lp + j] = l[i];
-        }
-
-        // VER_SD
-        l = line + mv;
-        for (lp = 0; lp < lh; lp++) {
-            int i, j = 0;
-
-            for (i = 0; i < lv; i++)
-                l[i] = t[w*i + lp];
-
-            sd_1d53(line, mv, mv + lv);
-
-            // copy back and deinterleave
-            for (i =   mv; i < lv; i+=2, j++)
-                t[w*j + lp] = l[i];
-            for (i = 1-mv; i < lv; i+=2, j++)
-                t[w*j + lp] = l[i];
-        }
-    }
-}
-
-static void sd_1d97(float *p, int i0, int i1)
-{
-    int i;
-
-    if (i1 == i0 + 1)
-        return;
-
-    extend97(p, i0, i1);
-    i0++; i1++;
-
-    for (i = i0/2 - 2; i < i1/2 + 1; i++)
-        p[2*i+1] -= 1.586134 * (p[2*i] + p[2*i+2]);
-    for (i = i0/2 - 1; i < i1/2 + 1; i++)
-        p[2*i] -= 0.052980 * (p[2*i-1] + p[2*i+1]);
-    for (i = i0/2 - 1; i < i1/2; i++)
-        p[2*i+1] += 0.882911 * (p[2*i] + p[2*i+2]);
-    for (i = i0/2; i < i1/2; i++)
-        p[2*i] += 0.443506 * (p[2*i-1] + p[2*i+1]);
-}
-
-static void dwt_encode97(DWTContext *s, int *t)
-{
-    int lev,
-        w = s->linelen[s->ndeclevels-1][0];
-    float *line = s->linebuf;
-    line += 5;
-
-    for (lev = s->ndeclevels-1; lev >= 0; lev--){
-        int lh = s->linelen[lev][0],
-            lv = s->linelen[lev][1],
-            mh = s->mod[lev][0],
-            mv = s->mod[lev][1],
-            lp;
-        float *l;
-
-        // HOR_SD
-        l = line + mh;
-        for (lp = 0; lp < lv; lp++){
-            int i, j = 0;
-
-            for (i = 0; i < lh; i++)
-                l[i] = t[w*lp + i];
-
-            sd_1d97(line, mh, mh + lh);
-
-            // copy back and deinterleave
-            for (i =   mh; i < lh; i+=2, j++)
-                t[w*lp + j] = scale97[0] * l[i] / 2;
-            for (i = 1-mh; i < lh; i+=2, j++)
-                t[w*lp + j] = scale97[1] * l[i] / 2;
-        }
-
-        // VER_SD
-        l = line + mv;
-        for (lp = 0; lp < lh; lp++) {
-            int i, j = 0;
-
-            for (i = 0; i < lv; i++)
-                l[i] = t[w*i + lp];
-
-            sd_1d97(line, mv, mv + lv);
-
-            // copy back and deinterleave
-            for (i =   mv; i < lv; i+=2, j++)
-                t[w*j + lp] = scale97[0] * l[i] / 2;
-            for (i = 1-mv; i < lv; i+=2, j++)
-                t[w*j + lp] = scale97[1] * l[i] / 2;
-        }
-    }
-}
-
-static void sr_1d53(int *p, int i0, int i1)
-{
-    int i;
-
-    if (i1 == i0 + 1)
-        return;
-
-    extend53(p, i0, i1);
-
-    for (i = i0/2; i < i1/2 + 1; i++)
-        p[2*i] -= (p[2*i-1] + p[2*i+1] + 2) >> 2;
-    for (i = i0/2; i < i1/2; i++)
-        p[2*i+1] += (p[2*i] + p[2*i+2]) >> 1;
-}
-
-static void dwt_decode53(DWTContext *s, int *t)
-{
-    int lev,
-        w = s->linelen[s->ndeclevels-1][0];
-    int *line = s->linebuf;
-    line += 3;
-
-    for (lev = 0; lev < s->ndeclevels; lev++){
-        int lh = s->linelen[lev][0],
-            lv = s->linelen[lev][1],
-            mh = s->mod[lev][0],
-            mv = s->mod[lev][1],
-            lp;
-        int *l;
-
-        // HOR_SD
-        l = line + mh;
-        for (lp = 0; lp < lv; lp++){
-            int i, j = 0;
-            // copy with interleaving
-            for (i =   mh; i < lh; i+=2, j++)
-                l[i] = t[w*lp + j];
-            for (i = 1-mh; i < lh; i+=2, j++)
-                l[i] = t[w*lp + j];
-
-            sr_1d53(line, mh, mh + lh);
-
-            for (i = 0; i < lh; i++)
-                t[w*lp + i] = l[i];
-        }
-
-        // VER_SD
-        l = line + mv;
-        for (lp = 0; lp < lh; lp++){
-            int i, j = 0;
-            // copy with interleaving
-            for (i =   mv; i < lv; i+=2, j++)
-                l[i] = t[w*j + lp];
-            for (i = 1-mv; i < lv; i+=2, j++)
-                l[i] = t[w*j + lp];
-
-            sr_1d53(line, mv, mv + lv);
-
-            for (i = 0; i < lv; i++)
-                t[w*i + lp] = l[i];
-        }
-    }
-}
-
-static void sr_1d97(float *p, int i0, int i1)
-{
-    int i;
-
-    if (i1 == i0 + 1)
-        return;
-
-    extend97(p, i0, i1);
-
-    for (i = i0/2 - 1; i < i1/2 + 2; i++)
-        p[2*i] -= 0.443506 * (p[2*i-1] + p[2*i+1]);
-    for (i = i0/2 - 1; i < i1/2 + 1; i++)
-        p[2*i+1] -= 0.882911 * (p[2*i] + p[2*i+2]);
-    for (i = i0/2; i < i1/2 + 1; i++)
-        p[2*i] += 0.052980 * (p[2*i-1] + p[2*i+1]);
-    for (i = i0/2; i < i1/2; i++)
-        p[2*i+1] += 1.586134 * (p[2*i] + p[2*i+2]);
-}
-
-static void dwt_decode97(DWTContext *s, int *t)
-{
-    int lev,
-        w = s->linelen[s->ndeclevels-1][0];
-    float *line = s->linebuf;
-    line += 5;
-
-    for (lev = 0; lev < s->ndeclevels; lev++){
-        int lh = s->linelen[lev][0],
-            lv = s->linelen[lev][1],
-            mh = s->mod[lev][0],
-            mv = s->mod[lev][1],
-            lp;
-        float *l;
-
-        // HOR_SD
-        l = line + mh;
-        for (lp = 0; lp < lv; lp++){
-            int i, j = 0;
-            // copy with interleaving
-            for (i =   mh; i < lh; i+=2, j++)
-                l[i] = scale97[1] * t[w*lp + j];
-            for (i = 1-mh; i < lh; i+=2, j++)
-                l[i] = scale97[0] * t[w*lp + j];
-
-            sr_1d97(line, mh, mh + lh);
-
-            for (i = 0; i < lh; i++)
-                t[w*lp + i] = l[i];
-        }
-
-        // VER_SD
-        l = line + mv;
-        for (lp = 0; lp < lh; lp++){
-            int i, j = 0;
-            // copy with interleaving
-            for (i =   mv; i < lv; i+=2, j++)
-                l[i] = scale97[1] * t[w*j + lp];
-            for (i = 1-mv; i < lv; i+=2, j++)
-                l[i] = scale97[0] * t[w*j + lp];
-
-            sr_1d97(line, mv, mv + lv);
-
-            for (i = 0; i < lv; i++)
-                t[w*i + lp] = l[i];
-        }
-    }
-}
-
-int ff_j2k_dwt_init(DWTContext *s, uint16_t border[2][2], int decomp_levels, int type)
-{
-    int i, j, lev = decomp_levels, maxlen,
-        b[2][2];
-
-    if ((unsigned)decomp_levels >= FF_DWT_MAX_DECLVLS)
-        return AVERROR_INVALIDDATA;
-    s->ndeclevels = decomp_levels;
-    s->type = type;
-
-    for (i = 0; i < 2; i++)
-        for(j = 0; j < 2; j++)
-            b[i][j] = border[i][j];
-
-    maxlen = FFMAX(b[0][1] - b[0][0],
-                   b[1][1] - b[1][0]);
-
-    while(--lev >= 0){
-        for (i = 0; i < 2; i++){
-            s->linelen[lev][i] = b[i][1] - b[i][0];
-            s->mod[lev][i] = b[i][0] & 1;
-            for (j = 0; j < 2; j++)
-                b[i][j] = (b[i][j] + 1) >> 1;
-        }
-    }
-    if (type == FF_DWT97)
-        s->linebuf = av_malloc((maxlen + 12) * sizeof(float));
-    else if (type == FF_DWT53)
-        s->linebuf = av_malloc((maxlen + 6) * sizeof(int));
-    else
-        return -1;
-
-    if (!s->linebuf)
-        return AVERROR(ENOMEM);
-
-    return 0;
-}
-
-int ff_j2k_dwt_encode(DWTContext *s, int *t)
-{
-    switch(s->type){
-        case FF_DWT97:
-            dwt_encode97(s, t); break;
-        case FF_DWT53:
-            dwt_encode53(s, t); break;
-        default:
-            return -1;
-    }
-    return 0;
-}
-
-int ff_j2k_dwt_decode(DWTContext *s, int *t)
-{
-    switch(s->type){
-        case FF_DWT97:
-            dwt_decode97(s, t); break;
-        case FF_DWT53:
-            dwt_decode53(s, t); break;
-        default:
-            return -1;
-    }
-    return 0;
-}
-
-void ff_j2k_dwt_destroy(DWTContext *s)
-{
-    av_freep(&s->linebuf);
-}
diff --git a/libavcodec/j2k_dwt.h b/libavcodec/j2k_dwt.h
deleted file mode 100644
index a2a25a6891..0000000000
--- a/libavcodec/j2k_dwt.h
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
- * 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 */
diff --git a/libavcodec/j2kdec.c b/libavcodec/j2kdec.c
index 7bf0e9e6de..28c5f1c6d4 100644
--- a/libavcodec/j2kdec.c
+++ b/libavcodec/j2kdec.c
@@ -841,7 +841,7 @@ static int decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
             } /* end band */
         } /* end reslevel */
 
-        ff_j2k_dwt_decode(&comp->dwt, comp->data);
+        ff_dwt_decode(&comp->dwt, comp->data);
         src[compno] = comp->data;
     } /*end comp */
 
diff --git a/libavcodec/j2kenc.c b/libavcodec/j2kenc.c
index bd90d4e55d..528b9a7f16 100644
--- a/libavcodec/j2kenc.c
+++ b/libavcodec/j2kenc.c
@@ -819,7 +819,7 @@ static int encode_tile(Jpeg2000EncoderContext *s, Jpeg2000Tile *tile, int tileno
         Jpeg2000Component *comp = s->tile[tileno].comp + compno;
 
         av_log(s->avctx, AV_LOG_DEBUG,"dwt\n");
-        if (ret = ff_j2k_dwt_encode(&comp->dwt, comp->data))
+        if (ret = ff_dwt_encode(&comp->dwt, comp->data))
             return ret;
         av_log(s->avctx, AV_LOG_DEBUG,"after dwt -> tier1\n");
 
diff --git a/libavcodec/jpeg2000dwt.c b/libavcodec/jpeg2000dwt.c
index 080b0a045d..905ce1805b 100644
--- a/libavcodec/jpeg2000dwt.c
+++ b/libavcodec/jpeg2000dwt.c
@@ -51,7 +51,6 @@
 #define I_LFTG_K       80621
 #define I_LFTG_X      106544
 
-
 static inline void extend53(int *p, int i0, int i1)
 {
     p[i0 - 1] = p[i0 + 1];
@@ -80,6 +79,143 @@ static inline void extend97_int(int32_t *p, int i0, int i1)
     }
 }
 
+static void sd_1d53(int *p, int i0, int i1)
+{
+    int i;
+
+    if (i1 == i0 + 1)
+        return;
+
+    extend53(p, i0, i1);
+
+    for (i = (i0+1)/2 - 1; i < (i1+1)/2; i++)
+        p[2*i+1] -= (p[2*i] + p[2*i+2]) >> 1;
+    for (i = (i0+1)/2; i < (i1+1)/2; i++)
+        p[2*i] += (p[2*i-1] + p[2*i+1] + 2) >> 2;
+}
+
+static void dwt_encode53(DWTContext *s, int *t)
+{
+    int lev,
+        w = s->linelen[s->ndeclevels-1][0];
+    int *line = s->i_linebuf;
+    line += 3;
+
+    for (lev = s->ndeclevels-1; lev >= 0; lev--){
+        int lh = s->linelen[lev][0],
+            lv = s->linelen[lev][1],
+            mh = s->mod[lev][0],
+            mv = s->mod[lev][1],
+            lp;
+        int *l;
+
+        // HOR_SD
+        l = line + mh;
+        for (lp = 0; lp < lv; lp++){
+            int i, j = 0;
+
+            for (i = 0; i < lh; i++)
+                l[i] = t[w*lp + i];
+
+            sd_1d53(line, mh, mh + lh);
+
+            // copy back and deinterleave
+            for (i =   mh; i < lh; i+=2, j++)
+                t[w*lp + j] = l[i];
+            for (i = 1-mh; i < lh; i+=2, j++)
+                t[w*lp + j] = l[i];
+        }
+
+        // VER_SD
+        l = line + mv;
+        for (lp = 0; lp < lh; lp++) {
+            int i, j = 0;
+
+            for (i = 0; i < lv; i++)
+                l[i] = t[w*i + lp];
+
+            sd_1d53(line, mv, mv + lv);
+
+            // copy back and deinterleave
+            for (i =   mv; i < lv; i+=2, j++)
+                t[w*j + lp] = l[i];
+            for (i = 1-mv; i < lv; i+=2, j++)
+                t[w*j + lp] = l[i];
+        }
+    }
+}
+
+static void sd_1d97(float *p, int i0, int i1)
+{
+    int i;
+
+    if (i1 == i0 + 1)
+        return;
+
+    extend97_float(p, i0, i1);
+    i0++; i1++;
+
+    for (i = i0/2 - 2; i < i1/2 + 1; i++)
+        p[2*i+1] -= 1.586134 * (p[2*i] + p[2*i+2]);
+    for (i = i0/2 - 1; i < i1/2 + 1; i++)
+        p[2*i] -= 0.052980 * (p[2*i-1] + p[2*i+1]);
+    for (i = i0/2 - 1; i < i1/2; i++)
+        p[2*i+1] += 0.882911 * (p[2*i] + p[2*i+2]);
+    for (i = i0/2; i < i1/2; i++)
+        p[2*i] += 0.443506 * (p[2*i-1] + p[2*i+1]);
+}
+
+static void dwt_encode97_int(DWTContext *s, int *t)
+{
+    int lev,
+        w = s->linelen[s->ndeclevels-1][0];
+    float *line = s->i_linebuf;
+    line += 5;
+
+    for (lev = s->ndeclevels-1; lev >= 0; lev--){
+        int lh = s->linelen[lev][0],
+            lv = s->linelen[lev][1],
+            mh = s->mod[lev][0],
+            mv = s->mod[lev][1],
+            lp;
+        float *l;
+
+        // HOR_SD
+        l = line + mh;
+        for (lp = 0; lp < lv; lp++){
+            int i, j = 0;
+
+            for (i = 0; i < lh; i++)
+                l[i] = t[w*lp + i];
+
+            sd_1d97(line, mh, mh + lh);
+
+            // copy back and deinterleave
+            for (i =   mh; i < lh; i+=2, j++)
+                t[w*lp + j] = F_LFTG_X * l[i] / 2;
+            for (i = 1-mh; i < lh; i+=2, j++)
+                t[w*lp + j] = F_LFTG_K * l[i] / 2;
+        }
+
+        // VER_SD
+        l = line + mv;
+        for (lp = 0; lp < lh; lp++) {
+            int i, j = 0;
+
+            for (i = 0; i < lv; i++)
+                l[i] = t[w*i + lp];
+
+            sd_1d97(line, mv, mv + lv);
+
+            // copy back and deinterleave
+            for (i =   mv; i < lv; i+=2, j++)
+                t[w*j + lp] = F_LFTG_X * l[i] / 2;
+            for (i = 1-mv; i < lv; i+=2, j++)
+                t[w*j + lp] = F_LFTG_K * l[i] / 2;
+        }
+    }
+}
+
 static void sr_1d53(int *p, int i0, int i1)
 {
     int i;
@@ -346,6 +482,19 @@ int ff_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2],
     return 0;
 }
 
+int ff_dwt_encode(DWTContext *s, int *t)
+{
+    switch(s->type){
+        case FF_DWT97_INT:
+            dwt_encode97_int(s, t); break;
+        case FF_DWT53:
+            dwt_encode53(s, t); break;
+        default:
+            return -1;
+    }
+    return 0;
+}
+
 int ff_dwt_decode(DWTContext *s, void *t)
 {
     switch (s->type) {
diff --git a/libavcodec/jpeg2000dwt.h b/libavcodec/jpeg2000dwt.h
index 2abfd15d64..acea77a959 100644
--- a/libavcodec/jpeg2000dwt.h
+++ b/libavcodec/jpeg2000dwt.h
@@ -57,6 +57,7 @@ typedef struct DWTContext {
 int ff_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2],
                          int decomp_levels, int type);
 
+int ff_dwt_encode(DWTContext *s, int *t);
 int ff_dwt_decode(DWTContext *s, void *t);
 
 void ff_dwt_destroy(DWTContext *s);