387 lines
9.4 KiB
C
387 lines
9.4 KiB
C
/*
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* Discrete wavelet transform
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* Copyright (c) 2007 Kamil Nowosad
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* Discrete wavelet transform
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* @file
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* @author Kamil Nowosad
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*/
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#include "j2k_dwt.h"
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const static float scale97[] = {1.625786, 1.230174};
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static inline void extend53(int *p, int i0, int i1)
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{
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p[i0 - 1] = p[i0 + 1];
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p[i1 ] = p[i1 - 2];
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p[i0 - 2] = p[i0 + 2];
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p[i1 + 1] = p[i1 - 3];
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}
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static inline void extend97(float *p, int i0, int i1)
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{
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int i;
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for (i = 1; i <= 4; i++){
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p[i0 - i] = p[i0 + i];
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p[i1 + i - 1] = p[i1 - i - 1];
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}
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}
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static void sd_1d53(int *p, int i0, int i1)
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{
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int i;
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if (i1 == i0 + 1)
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return;
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extend53(p, i0, i1);
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for (i = (i0+1)/2 - 1; i < (i1+1)/2; i++)
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p[2*i+1] -= (p[2*i] + p[2*i+2]) >> 1;
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for (i = (i0+1)/2; i < (i1+1)/2; i++)
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p[2*i] += (p[2*i-1] + p[2*i+1] + 2) >> 2;
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}
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static void dwt_encode53(DWTContext *s, int *t)
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{
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int lev,
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w = s->linelen[s->ndeclevels-1][0];
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int *line = s->linebuf;
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line += 3;
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for (lev = s->ndeclevels-1; lev >= 0; lev--){
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int lh = s->linelen[lev][0],
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lv = s->linelen[lev][1],
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mh = s->mod[lev][0],
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mv = s->mod[lev][1],
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lp;
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int *l;
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// HOR_SD
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l = line + mh;
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for (lp = 0; lp < lv; lp++){
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int i, j = 0;
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for (i = 0; i < lh; i++)
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l[i] = t[w*lp + i];
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sd_1d53(line, mh, mh + lh);
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// copy back and deinterleave
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for (i = mh; i < lh; i+=2, j++)
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t[w*lp + j] = l[i];
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for (i = 1-mh; i < lh; i+=2, j++)
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t[w*lp + j] = l[i];
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}
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// VER_SD
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l = line + mv;
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for (lp = 0; lp < lh; lp++) {
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int i, j = 0;
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for (i = 0; i < lv; i++)
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l[i] = t[w*i + lp];
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sd_1d53(line, mv, mv + lv);
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// copy back and deinterleave
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for (i = mv; i < lv; i+=2, j++)
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t[w*j + lp] = l[i];
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for (i = 1-mv; i < lv; i+=2, j++)
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t[w*j + lp] = l[i];
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}
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}
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}
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static void sd_1d97(float *p, int i0, int i1)
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{
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int i;
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if (i1 == i0 + 1)
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return;
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extend97(p, i0, i1);
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i0++; i1++;
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for (i = i0/2 - 2; i < i1/2 + 1; i++)
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p[2*i+1] -= 1.586134 * (p[2*i] + p[2*i+2]);
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for (i = i0/2 - 1; i < i1/2 + 1; i++)
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p[2*i] -= 0.052980 * (p[2*i-1] + p[2*i+1]);
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for (i = i0/2 - 1; i < i1/2; i++)
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p[2*i+1] += 0.882911 * (p[2*i] + p[2*i+2]);
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for (i = i0/2; i < i1/2; i++)
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p[2*i] += 0.443506 * (p[2*i-1] + p[2*i+1]);
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}
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static void dwt_encode97(DWTContext *s, int *t)
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{
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int lev,
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w = s->linelen[s->ndeclevels-1][0];
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float *line = s->linebuf;
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line += 5;
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for (lev = s->ndeclevels-1; lev >= 0; lev--){
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int lh = s->linelen[lev][0],
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lv = s->linelen[lev][1],
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mh = s->mod[lev][0],
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mv = s->mod[lev][1],
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lp;
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float *l;
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// HOR_SD
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l = line + mh;
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for (lp = 0; lp < lv; lp++){
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int i, j = 0;
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for (i = 0; i < lh; i++)
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l[i] = t[w*lp + i];
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sd_1d97(line, mh, mh + lh);
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// copy back and deinterleave
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for (i = mh; i < lh; i+=2, j++)
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t[w*lp + j] = scale97[mh] * l[i] / 2;
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for (i = 1-mh; i < lh; i+=2, j++)
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t[w*lp + j] = scale97[mh] * l[i] / 2;
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}
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// VER_SD
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l = line + mv;
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for (lp = 0; lp < lh; lp++) {
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int i, j = 0;
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for (i = 0; i < lv; i++)
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l[i] = t[w*i + lp];
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sd_1d97(line, mv, mv + lv);
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// copy back and deinterleave
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for (i = mv; i < lv; i+=2, j++)
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t[w*j + lp] = scale97[mv] * l[i] / 2;
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for (i = 1-mv; i < lv; i+=2, j++)
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t[w*j + lp] = scale97[mv] * l[i] / 2;
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}
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}
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}
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static void sr_1d53(int *p, int i0, int i1)
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{
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int i;
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if (i1 == i0 + 1)
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return;
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extend53(p, i0, i1);
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for (i = i0/2; i < i1/2 + 1; i++)
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p[2*i] -= (p[2*i-1] + p[2*i+1] + 2) >> 2;
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for (i = i0/2; i < i1/2; i++)
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p[2*i+1] += (p[2*i] + p[2*i+2]) >> 1;
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}
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static void dwt_decode53(DWTContext *s, int *t)
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{
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int lev,
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w = s->linelen[s->ndeclevels-1][0];
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int *line = s->linebuf;
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line += 3;
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for (lev = 0; lev < s->ndeclevels; lev++){
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int lh = s->linelen[lev][0],
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lv = s->linelen[lev][1],
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mh = s->mod[lev][0],
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mv = s->mod[lev][1],
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lp;
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int *l;
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// HOR_SD
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l = line + mh;
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for (lp = 0; lp < lv; lp++){
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int i, j = 0;
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// copy with interleaving
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for (i = mh; i < lh; i+=2, j++)
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l[i] = t[w*lp + j];
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for (i = 1-mh; i < lh; i+=2, j++)
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l[i] = t[w*lp + j];
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sr_1d53(line, mh, mh + lh);
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for (i = 0; i < lh; i++)
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t[w*lp + i] = l[i];
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}
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// VER_SD
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l = line + mv;
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for (lp = 0; lp < lh; lp++){
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int i, j = 0;
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// copy with interleaving
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for (i = mv; i < lv; i+=2, j++)
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l[i] = t[w*j + lp];
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for (i = 1-mv; i < lv; i+=2, j++)
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l[i] = t[w*j + lp];
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sr_1d53(line, mv, mv + lv);
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for (i = 0; i < lv; i++)
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t[w*i + lp] = l[i];
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}
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}
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}
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static void sr_1d97(float *p, int i0, int i1)
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{
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int i;
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if (i1 == i0 + 1)
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return;
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extend97(p, i0, i1);
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for (i = i0/2 - 1; i < i1/2 + 2; i++)
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p[2*i] -= 0.443506 * (p[2*i-1] + p[2*i+1]);
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for (i = i0/2 - 1; i < i1/2 + 1; i++)
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p[2*i+1] -= 0.882911 * (p[2*i] + p[2*i+2]);
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for (i = i0/2; i < i1/2 + 1; i++)
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p[2*i] += 0.052980 * (p[2*i-1] + p[2*i+1]);
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for (i = i0/2; i < i1/2; i++)
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p[2*i+1] += 1.586134 * (p[2*i] + p[2*i+2]);
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}
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static void dwt_decode97(DWTContext *s, int *t)
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{
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int lev,
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w = s->linelen[s->ndeclevels-1][0];
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float *line = s->linebuf;
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line += 5;
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for (lev = 0; lev < s->ndeclevels; lev++){
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int lh = s->linelen[lev][0],
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lv = s->linelen[lev][1],
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mh = s->mod[lev][0],
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mv = s->mod[lev][1],
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lp;
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float *l;
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// HOR_SD
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l = line + mh;
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for (lp = 0; lp < lv; lp++){
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int i, j = 0;
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// copy with interleaving
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for (i = mh; i < lh; i+=2, j++)
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l[i] = scale97[1-mh] * t[w*lp + j];
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for (i = 1-mh; i < lh; i+=2, j++)
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l[i] = scale97[1-mh] * t[w*lp + j];
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sr_1d97(line, mh, mh + lh);
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for (i = 0; i < lh; i++)
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t[w*lp + i] = l[i];
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}
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// VER_SD
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l = line + mv;
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for (lp = 0; lp < lh; lp++){
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int i, j = 0;
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// copy with interleaving
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for (i = mv; i < lv; i+=2, j++)
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l[i] = scale97[1-mv] * t[w*j + lp];
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for (i = 1-mv; i < lv; i+=2, j++)
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l[i] = scale97[1-mv] * t[w*j + lp];
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sr_1d97(line, mv, mv + lv);
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for (i = 0; i < lv; i++)
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t[w*i + lp] = l[i];
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}
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}
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}
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int ff_j2k_dwt_init(DWTContext *s, uint16_t border[2][2], int decomp_levels, int type)
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{
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int i, j, lev = decomp_levels, maxlen,
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b[2][2];
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if (decomp_levels >= FF_DWT_MAX_DECLVLS)
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return AVERROR_INVALIDDATA;
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s->ndeclevels = decomp_levels;
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s->type = type;
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for (i = 0; i < 2; i++)
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for(j = 0; j < 2; j++)
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b[i][j] = border[i][j];
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maxlen = FFMAX(b[0][1] - b[0][0],
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b[1][1] - b[1][0]);
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while(--lev >= 0){
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for (i = 0; i < 2; i++){
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s->linelen[lev][i] = b[i][1] - b[i][0];
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s->mod[lev][i] = b[i][0] & 1;
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for (j = 0; j < 2; j++)
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b[i][j] = (b[i][j] + 1) >> 1;
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}
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}
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if (type == FF_DWT97)
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s->linebuf = av_malloc((maxlen + 12) * sizeof(float));
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else if (type == FF_DWT53)
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s->linebuf = av_malloc((maxlen + 6) * sizeof(int));
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else
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return -1;
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if (!s->linebuf)
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return AVERROR(ENOMEM);
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return 0;
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}
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int ff_j2k_dwt_encode(DWTContext *s, int *t)
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{
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switch(s->type){
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case FF_DWT97:
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dwt_encode97(s, t); break;
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case FF_DWT53:
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dwt_encode53(s, t); break;
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default:
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return -1;
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}
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return 0;
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}
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int ff_j2k_dwt_decode(DWTContext *s, int *t)
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{
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switch(s->type){
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case FF_DWT97:
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dwt_decode97(s, t); break;
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case FF_DWT53:
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dwt_decode53(s, t); break;
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default:
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return -1;
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}
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return 0;
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}
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void ff_j2k_dwt_destroy(DWTContext *s)
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{
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av_freep(&s->linebuf);
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}
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