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-rw-r--r--libavcodec/j2k_dwt.c386
1 files changed, 386 insertions, 0 deletions
diff --git a/libavcodec/j2k_dwt.c b/libavcodec/j2k_dwt.c
new file mode 100644
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+++ b/libavcodec/j2k_dwt.c
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+/*
+ * 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[mh] * l[i] / 2;
+ for (i = 1-mh; i < lh; i+=2, j++)
+ t[w*lp + j] = scale97[mh] * 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[mv] * l[i] / 2;
+ for (i = 1-mv; i < lv; i+=2, j++)
+ t[w*j + lp] = scale97[mv] * 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-mh] * t[w*lp + j];
+ for (i = 1-mh; i < lh; i+=2, j++)
+ l[i] = scale97[1-mh] * 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-mv] * t[w*j + lp];
+ for (i = 1-mv; i < lv; i+=2, j++)
+ l[i] = scale97[1-mv] * 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);
+}
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