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FFmpeg/libavcodec/jpeg2000dwt.c
Michael Niedermayer c4604b8792 jpeg2000: Merge rescaling with interleaving in 9/7 IDWT 
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
2013-07-02 20:05:48 +02:00

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/*
* Discrete wavelet transform
* Copyright (c) 2007 Kamil Nowosad
* Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>
*
* 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
*/
/**
* @file
* Discrete wavelet transform
*/
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "jpeg2000dwt.h"
#include "internal.h"
/* Defines for 9/7 DWT lifting parameters.
* Parameters are in float. */
#define F_LFTG_ALPHA 1.586134342059924f
#define F_LFTG_BETA 0.052980118572961f
#define F_LFTG_GAMMA 0.882911075530934f
#define F_LFTG_DELTA 0.443506852043971f
#define F_LFTG_K 1.230174104914001f
#define F_LFTG_X 1.625732422f
/* FIXME: Why use 1.625732422 instead of 1/F_LFTG_K?
* Incorrect value in JPEG2000 norm.
* see (ISO/IEC 15444:1 (version 2002) F.3.8.2 */
/* Lifting parameters in integer format.
* Computed as param = (float param) * (1 << 16) */
#define I_LFTG_ALPHA 103949
#define I_LFTG_BETA 3472
#define I_LFTG_GAMMA 57862
#define I_LFTG_DELTA 29066
#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];
p[i1] = p[i1 - 2];
p[i0 - 2] = p[i0 + 2];
p[i1 + 1] = p[i1 - 3];
}
static inline void extend97_float(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 inline void extend97_int(int32_t *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 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;
int w = s->linelen[s->ndeclevels - 1][0];
int32_t *line = s->i_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(float *p, int i0, int i1)
{
int i;
if (i1 == i0 + 1)
return;
extend97_float(p, i0, i1);
for (i = i0 / 2 - 1; i < i1 / 2 + 2; i++)
p[2 * i] -= F_LFTG_DELTA * (p[2 * i - 1] + p[2 * i + 1]);
/* step 4 */
for (i = i0 / 2 - 1; i < i1 / 2 + 1; i++)
p[2 * i + 1] -= F_LFTG_GAMMA * (p[2 * i] + p[2 * i + 2]);
/*step 5*/
for (i = i0 / 2; i < i1 / 2 + 1; i++)
p[2 * i] += F_LFTG_BETA * (p[2 * i - 1] + p[2 * i + 1]);
/* step 6 */
for (i = i0 / 2; i < i1 / 2; i++)
p[2 * i + 1] += F_LFTG_ALPHA * (p[2 * i] + p[2 * i + 2]);
}
static void dwt_decode97_float(DWTContext *s, float *t)
{
int lev;
int w = s->linelen[s->ndeclevels - 1][0];
float *line = s->f_linebuf;
float *data = t;
/* position at index O of line range [0-5,w+5] cf. extend function */
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] = data[w * lp + j] * F_LFTG_K;
for (i = 1 - mh; i < lh; i += 2, j++)
l[i] = data[w * lp + j] * F_LFTG_X;
sr_1d97_float(line, mh, mh + lh);
for (i = 0; i < lh; i++)
data[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] = data[w * j + lp] * F_LFTG_K;
for (i = 1 - mv; i < lv; i += 2, j++)
l[i] = data[w * j + lp] * F_LFTG_X;
sr_1d97_float(line, mv, mv + lv);
for (i = 0; i < lv; i++)
data[w * i + lp] = l[i];
}
}
}
static void sr_1d97_int(int32_t *p, int i0, int i1)
{
int i;
if (i1 == i0 + 1)
return;
extend97_int(p, i0, i1);
for (i = i0 / 2 - 1; i < i1 / 2 + 2; i++)
p[2 * i] -= (I_LFTG_DELTA * (p[2 * i - 1] + p[2 * i + 1]) + (1 << 15)) >> 16;
/* step 4 */
for (i = i0 / 2 - 1; i < i1 / 2 + 1; i++)
p[2 * i + 1] -= (I_LFTG_GAMMA * (p[2 * i] + p[2 * i + 2]) + (1 << 15)) >> 16;
/*step 5*/
for (i = i0 / 2; i < i1 / 2 + 1; i++)
p[2 * i] += (I_LFTG_BETA * (p[2 * i - 1] + p[2 * i + 1]) + (1 << 15)) >> 16;
/* step 6 */
for (i = i0 / 2; i < i1 / 2; i++)
p[2 * i + 1] += (I_LFTG_ALPHA * (p[2 * i] + p[2 * i + 2]) + (1 << 15)) >> 16;
}
static void dwt_decode97_int(DWTContext *s, int32_t *t)
{
int lev;
int w = s->linelen[s->ndeclevels - 1][0];
int32_t *line = s->i_linebuf;
int32_t *data = t;
/* position at index O of line range [0-5,w+5] cf. extend function */
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;
int32_t *l;
// HOR_SD
l = line + mh;
for (lp = 0; lp < lv; lp++) {
int i, j = 0;
// rescale with interleaving
for (i = mh; i < lh; i += 2, j++)
l[i] = ((data[w * lp + j] * I_LFTG_K) + (1 << 15)) >> 16;
for (i = 1 - mh; i < lh; i += 2, j++)
l[i] = ((data[w * lp + j] * I_LFTG_X) + (1 << 15)) >> 16;
sr_1d97_int(line, mh, mh + lh);
for (i = 0; i < lh; i++)
data[w * lp + i] = l[i];
}
// VER_SD
l = line + mv;
for (lp = 0; lp < lh; lp++) {
int i, j = 0;
// rescale with interleaving
for (i = mv; i < lv; i += 2, j++)
l[i] = ((data[w * j + lp] * I_LFTG_K) + (1 << 15)) >> 16;
for (i = 1 - mv; i < lv; i += 2, j++)
l[i] = ((data[w * j + lp] * I_LFTG_X) + (1 << 15)) >> 16;
sr_1d97_int(line, mv, mv + lv);
for (i = 0; i < lv; i++)
data[w * i + lp] = l[i];
}
}
}
int ff_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2],
int decomp_levels, int type)
{
int i, j, lev = decomp_levels, maxlen,
b[2][2];
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;
}
switch (type) {
case FF_DWT97:
s->f_linebuf = av_malloc((maxlen + 12) * sizeof(*s->f_linebuf));
if (!s->f_linebuf)
return AVERROR(ENOMEM);
break;
case FF_DWT97_INT:
s->i_linebuf = av_malloc((maxlen + 12) * sizeof(*s->i_linebuf));
if (!s->i_linebuf)
return AVERROR(ENOMEM);
break;
case FF_DWT53:
s->i_linebuf = av_malloc((maxlen + 6) * sizeof(*s->i_linebuf));
if (!s->i_linebuf)
return AVERROR(ENOMEM);
break;
default:
return -1;
}
return 0;
}
int ff_dwt_decode(DWTContext *s, void *t)
{
switch (s->type) {
case FF_DWT97:
dwt_decode97_float(s, t);
break;
case FF_DWT97_INT:
dwt_decode97_int(s, t);
break;
case FF_DWT53:
dwt_decode53(s, t);
break;
default:
return -1;
}
return 0;
}
void ff_dwt_destroy(DWTContext *s)
{
av_freep(&s->f_linebuf);
av_freep(&s->i_linebuf);
}
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