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FFmpeg/libavcodec/j2k.c
Michael Niedermayer 4e3a5bc1f6 j2k: remove unreachable assert() 
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-06-10 23:27:17 +02:00

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/*
* JPEG2000 encoder and decoder common functions
* 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
*/
/**
* JPEG2000 image encoder and decoder common functions
* @file
* @author Kamil Nowosad
*/
#include "avcodec.h"
#include "j2k.h"
#define SHL(a, n) ((n)>=0 ? (a) << (n) : (a) >> -(n))
#if 0
void ff_j2k_printv(int *tab, int l)
{
int i;
for (i = 0; i < l; i++)
printf("%.3d ", tab[i]);
printf("\n");
}
void ff_j2k_printu(uint8_t *tab, int l)
{
int i;
for (i = 0; i < l; i++)
printf("%.3hd ", tab[i]);
printf("\n");
}
#endif
/* tag tree routines */
/** allocate the memory for tag tree */
static int tag_tree_size(int w, int h)
{
int res = 0;
while (w > 1 || h > 1){
res += w * h;
w = (w+1) >> 1;
h = (h+1) >> 1;
}
return res + 1;
}
J2kTgtNode *ff_j2k_tag_tree_init(int w, int h)
{
int pw = w, ph = h;
J2kTgtNode *res, *t, *t2;
t = res = av_mallocz(tag_tree_size(w, h)*sizeof(J2kTgtNode));
if (res == NULL)
return NULL;
while (w > 1 || h > 1){
int i, j;
pw = w;
ph = h;
w = (w+1) >> 1;
h = (h+1) >> 1;
t2 = t + pw*ph;
for (i = 0; i < ph; i++)
for (j = 0; j < pw; j++){
t[i*pw + j].parent = &t2[(i>>1)*w + (j>>1)];
}
t = t2;
}
t[0].parent = NULL;
return res;
}
static void tag_tree_zero(J2kTgtNode *t, int w, int h)
{
int i, siz = tag_tree_size(w, h);
for (i = 0; i < siz; i++){
t[i].val = 0;
t[i].vis = 0;
}
}
uint8_t ff_j2k_nbctxno_lut[256][4];
static int getnbctxno(int flag, int bandno, int vert_causal_ctx_csty_symbol)
{
int h, v, d;
h = ((flag & J2K_T1_SIG_E) ? 1:0)+
((flag & J2K_T1_SIG_W) ? 1:0);
v = ((flag & J2K_T1_SIG_N) ? 1:0);
if (!vert_causal_ctx_csty_symbol)
v = v + ((flag & J2K_T1_SIG_S) ? 1:0);
d = ((flag & J2K_T1_SIG_NE) ? 1:0)+
((flag & J2K_T1_SIG_NW) ? 1:0);
if (!vert_causal_ctx_csty_symbol)
d = d + ((flag & J2K_T1_SIG_SE) ? 1:0)+
((flag & J2K_T1_SIG_SW) ? 1:0);
if (bandno < 3){
if (bandno == 1)
FFSWAP(int, h, v);
if (h == 2) return 8;
if (h == 1){
if (v >= 1) return 7;
if (d >= 1) return 6;
return 5;
}
if (v == 2) return 4;
if (v == 1) return 3;
if (d >= 2) return 2;
if (d == 1) return 1;
return 0;
} else{
if (d >= 3) return 8;
if (d == 2){
if (h+v >= 1) return 7;
return 6;
}
if (d == 1){
if (h+v >= 2) return 5;
if (h+v == 1) return 4;
return 3;
}
if (h+v >= 2) return 2;
if (h+v == 1) return 1;
return 0;
}
}
uint8_t ff_j2k_sgnctxno_lut[16][16], ff_j2k_xorbit_lut[16][16];
static int getsgnctxno(int flag, uint8_t *xorbit)
{
int vcontrib, hcontrib;
static const int contribtab[3][3] = {{0, -1, 1}, {-1, -1, 0}, {1, 0, 1}};
static const int ctxlbltab[3][3] = {{13, 12, 11}, {10, 9, 10}, {11, 12, 13}};
static const int xorbittab[3][3] = {{1, 1, 1,}, {1, 0, 0}, {0, 0, 0}};
hcontrib = contribtab[flag & J2K_T1_SIG_E ? flag & J2K_T1_SGN_E ? 1:2:0]
[flag & J2K_T1_SIG_W ? flag & J2K_T1_SGN_W ? 1:2:0]+1;
vcontrib = contribtab[flag & J2K_T1_SIG_S ? flag & J2K_T1_SGN_S ? 1:2:0]
[flag & J2K_T1_SIG_N ? flag & J2K_T1_SGN_N ? 1:2:0]+1;
*xorbit = xorbittab[hcontrib][vcontrib];
return ctxlbltab[hcontrib][vcontrib];
}
void ff_j2k_init_tier1_luts(void)
{
int i, j;
for (i = 0; i < 256; i++)
for (j = 0; j < 4; j++)
ff_j2k_nbctxno_lut[i][j] = getnbctxno(i, j, 0);
for (i = 0; i < 16; i++)
for (j = 0; j < 16; j++)
ff_j2k_sgnctxno_lut[i][j] = getsgnctxno(i + (j << 8), &ff_j2k_xorbit_lut[i][j]);
}
void ff_j2k_set_significant(J2kT1Context *t1, int x, int y, int negative)
{
x++; y++;
t1->flags[y][x] |= J2K_T1_SIG;
if (negative){
t1->flags[y][x+1] |= J2K_T1_SIG_W | J2K_T1_SGN_W;
t1->flags[y][x-1] |= J2K_T1_SIG_E | J2K_T1_SGN_E;
t1->flags[y+1][x] |= J2K_T1_SIG_N | J2K_T1_SGN_N;
t1->flags[y-1][x] |= J2K_T1_SIG_S | J2K_T1_SGN_S;
} else{
t1->flags[y][x+1] |= J2K_T1_SIG_W;
t1->flags[y][x-1] |= J2K_T1_SIG_E;
t1->flags[y+1][x] |= J2K_T1_SIG_N;
t1->flags[y-1][x] |= J2K_T1_SIG_S;
}
t1->flags[y+1][x+1] |= J2K_T1_SIG_NW;
t1->flags[y+1][x-1] |= J2K_T1_SIG_NE;
t1->flags[y-1][x+1] |= J2K_T1_SIG_SW;
t1->flags[y-1][x-1] |= J2K_T1_SIG_SE;
}
int ff_j2k_init_component(J2kComponent *comp, J2kCodingStyle *codsty, J2kQuantStyle *qntsty, int cbps, int dx, int dy)
{
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))
return ret;
for (i = 0; i < 2; i++)
csize *= comp->coord[i][1] - comp->coord[i][0];
comp->data = av_malloc(csize * sizeof(int));
if (!comp->data)
return AVERROR(ENOMEM);
comp->reslevel = av_malloc(codsty->nreslevels * sizeof(J2kResLevel));
if (!comp->reslevel)
return AVERROR(ENOMEM);
for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
int declvl = codsty->nreslevels - reslevelno;
J2kResLevel *reslevel = comp->reslevel + reslevelno;
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
reslevel->coord[i][j] =
ff_j2k_ceildivpow2(comp->coord[i][j], declvl - 1);
if (reslevelno == 0)
reslevel->nbands = 1;
else
reslevel->nbands = 3;
if (reslevel->coord[0][1] == reslevel->coord[0][0])
reslevel->num_precincts_x = 0;
else
reslevel->num_precincts_x = ff_j2k_ceildivpow2(reslevel->coord[0][1], codsty->log2_prec_width)
- (reslevel->coord[0][0] >> codsty->log2_prec_width);
if (reslevel->coord[1][1] == reslevel->coord[1][0])
reslevel->num_precincts_y = 0;
else
reslevel->num_precincts_y = ff_j2k_ceildivpow2(reslevel->coord[1][1], codsty->log2_prec_height)
- (reslevel->coord[1][0] >> codsty->log2_prec_height);
reslevel->band = av_malloc(reslevel->nbands * sizeof(J2kBand));
if (!reslevel->band)
return AVERROR(ENOMEM);
for (bandno = 0; bandno < reslevel->nbands; bandno++, gbandno++){
J2kBand *band = reslevel->band + bandno;
int cblkno, precx, precy, precno;
int x0, y0, x1, y1;
int xi0, yi0, xi1, yi1;
int cblkperprecw, cblkperprech;
if (qntsty->quantsty != J2K_QSTY_NONE){
const static uint8_t lut_gain[2][4] = {{0, 0, 0, 0}, {0, 1, 1, 2}};
int numbps;
numbps = cbps + lut_gain[codsty->transform][bandno + reslevelno>0];
band->stepsize = SHL(2048 + qntsty->mant[gbandno], 2 + numbps - qntsty->expn[gbandno]);
} else
band->stepsize = 1 << 13;
if (reslevelno == 0){ // the same everywhere
band->codeblock_width = 1 << FFMIN(codsty->log2_cblk_width, codsty->log2_prec_width-1);
band->codeblock_height = 1 << FFMIN(codsty->log2_cblk_height, codsty->log2_prec_height-1);
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
band->coord[i][j] = ff_j2k_ceildivpow2(comp->coord[i][j], declvl-1);
} else{
band->codeblock_width = 1 << FFMIN(codsty->log2_cblk_width, codsty->log2_prec_width);
band->codeblock_height = 1 << FFMIN(codsty->log2_cblk_height, codsty->log2_prec_height);
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
band->coord[i][j] = ff_j2k_ceildivpow2(comp->coord[i][j] - (((bandno+1>>i)&1) << declvl-1), declvl);
}
band->cblknx = ff_j2k_ceildiv(band->coord[0][1], band->codeblock_width) - band->coord[0][0] / band->codeblock_width;
band->cblkny = ff_j2k_ceildiv(band->coord[1][1], band->codeblock_height) - band->coord[1][0] / band->codeblock_height;
for (j = 0; j < 2; j++)
band->coord[0][j] = ff_j2k_ceildiv(band->coord[0][j], dx);
for (j = 0; j < 2; j++)
band->coord[1][j] = ff_j2k_ceildiv(band->coord[1][j], dy);
band->cblknx = ff_j2k_ceildiv(band->cblknx, dx);
band->cblkny = ff_j2k_ceildiv(band->cblkny, dy);
band->cblk = av_malloc(band->cblknx * band->cblkny * sizeof(J2kCblk));
if (!band->cblk)
return AVERROR(ENOMEM);
band->prec = av_malloc(reslevel->num_precincts_x * reslevel->num_precincts_y * sizeof(J2kPrec));
if (!band->prec)
return AVERROR(ENOMEM);
for (cblkno = 0; cblkno < band->cblknx * band->cblkny; cblkno++){
J2kCblk *cblk = band->cblk + cblkno;
cblk->zero = 0;
cblk->lblock = 3;
cblk->length = 0;
cblk->lengthinc = 0;
cblk->npasses = 0;
}
y0 = band->coord[1][0];
y1 = ((band->coord[1][0] + (1<<codsty->log2_prec_height)) & ~((1<<codsty->log2_prec_height)-1)) - y0;
yi0 = 0;
yi1 = ff_j2k_ceildivpow2(y1 - y0, codsty->log2_cblk_height) << codsty->log2_cblk_height;
yi1 = FFMIN(yi1, band->cblkny);
cblkperprech = 1<<(codsty->log2_prec_height - codsty->log2_cblk_height);
for (precy = 0, precno = 0; precy < reslevel->num_precincts_y; precy++){
for (precx = 0; precx < reslevel->num_precincts_x; precx++, precno++){
band->prec[precno].yi0 = yi0;
band->prec[precno].yi1 = yi1;
}
yi1 += cblkperprech;
yi0 = yi1 - cblkperprech;
yi1 = FFMIN(yi1, band->cblkny);
}
x0 = band->coord[0][0];
x1 = ((band->coord[0][0] + (1<<codsty->log2_prec_width)) & ~((1<<codsty->log2_prec_width)-1)) - x0;
xi0 = 0;
xi1 = ff_j2k_ceildivpow2(x1 - x0, codsty->log2_cblk_width) << codsty->log2_cblk_width;
xi1 = FFMIN(xi1, band->cblknx);
cblkperprecw = 1<<(codsty->log2_prec_width - codsty->log2_cblk_width);
for (precx = 0, precno = 0; precx < reslevel->num_precincts_x; precx++){
for (precy = 0; precy < reslevel->num_precincts_y; precy++, precno = 0){
J2kPrec *prec = band->prec + precno;
prec->xi0 = xi0;
prec->xi1 = xi1;
prec->cblkincl = ff_j2k_tag_tree_init(prec->xi1 - prec->xi0,
prec->yi1 - prec->yi0);
prec->zerobits = ff_j2k_tag_tree_init(prec->xi1 - prec->xi0,
prec->yi1 - prec->yi0);
if (!prec->cblkincl || !prec->zerobits)
return AVERROR(ENOMEM);
}
xi1 += cblkperprecw;
xi0 = xi1 - cblkperprecw;
xi1 = FFMIN(xi1, band->cblknx);
}
}
}
return 0;
}
void ff_j2k_reinit(J2kComponent *comp, J2kCodingStyle *codsty)
{
int reslevelno, bandno, cblkno, precno;
for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
J2kResLevel *rlevel = comp->reslevel + reslevelno;
for (bandno = 0; bandno < rlevel->nbands; bandno++){
J2kBand *band = rlevel->band + bandno;
for(precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++){
J2kPrec *prec = band->prec + precno;
tag_tree_zero(prec->zerobits, prec->xi1 - prec->xi0, prec->yi1 - prec->yi0);
tag_tree_zero(prec->cblkincl, prec->xi1 - prec->xi0, prec->yi1 - prec->yi0);
}
for (cblkno = 0; cblkno < band->cblknx * band->cblkny; cblkno++){
J2kCblk *cblk = band->cblk + cblkno;
cblk->length = 0;
cblk->lblock = 3;
}
}
}
}
void ff_j2k_cleanup(J2kComponent *comp, J2kCodingStyle *codsty)
{
int reslevelno, bandno, precno;
for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
J2kResLevel *reslevel = comp->reslevel + reslevelno;
for (bandno = 0; bandno < reslevel->nbands ; bandno++){
J2kBand *band = reslevel->band + bandno;
for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++){
J2kPrec *prec = band->prec + precno;
av_freep(&prec->zerobits);
av_freep(&prec->cblkincl);
}
av_freep(&band->cblk);
av_freep(&band->prec);
}
av_freep(&reslevel->band);
}
ff_j2k_dwt_destroy(&comp->dwt);
av_freep(&comp->reslevel);
av_freep(&comp->data);
}
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