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FFmpeg/libavcodec/j2k_dwt.c
Michael Niedermayer 1f99939a63 j2kdec: Fix integer overflow leading to a segfault 
Fixes Ticket776
Bug found by: Diana Elena Muscalu

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2011-12-16 04:16:01 +01:00

387 lines
9.4 KiB
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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"
const static 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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