392 lines
14 KiB
C
392 lines
14 KiB
C
/*
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* JPEG2000 encoder and decoder common functions
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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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* JPEG2000 image encoder and decoder common functions
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* @file
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* @author Kamil Nowosad
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*/
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#include "avcodec.h"
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#include "j2k.h"
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#define SHL(a, n) ((n)>=0 ? (a) << (n) : (a) >> -(n))
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#if 0
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void ff_j2k_printv(int *tab, int l)
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{
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int i;
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for (i = 0; i < l; i++)
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printf("%.3d ", tab[i]);
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printf("\n");
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}
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void ff_j2k_printu(uint8_t *tab, int l)
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{
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int i;
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for (i = 0; i < l; i++)
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printf("%.3hd ", tab[i]);
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printf("\n");
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}
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#endif
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/* tag tree routines */
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/** allocate the memory for tag tree */
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static int tag_tree_size(int w, int h)
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{
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int res = 0;
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while (w > 1 || h > 1){
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res += w * h;
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w = (w+1) >> 1;
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h = (h+1) >> 1;
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}
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return res + 1;
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}
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J2kTgtNode *ff_j2k_tag_tree_init(int w, int h)
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{
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int pw = w, ph = h;
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J2kTgtNode *res, *t, *t2;
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t = res = av_mallocz(tag_tree_size(w, h)*sizeof(J2kTgtNode));
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if (res == NULL)
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return NULL;
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while (w > 1 || h > 1){
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int i, j;
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pw = w;
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ph = h;
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w = (w+1) >> 1;
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h = (h+1) >> 1;
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t2 = t + pw*ph;
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for (i = 0; i < ph; i++)
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for (j = 0; j < pw; j++){
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t[i*pw + j].parent = &t2[(i>>1)*w + (j>>1)];
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}
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t = t2;
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}
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t[0].parent = NULL;
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return res;
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}
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static void tag_tree_zero(J2kTgtNode *t, int w, int h)
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{
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int i, siz = tag_tree_size(w, h);
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for (i = 0; i < siz; i++){
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t[i].val = 0;
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t[i].vis = 0;
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}
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}
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uint8_t ff_j2k_nbctxno_lut[256][4];
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static int getnbctxno(int flag, int bandno, int vert_causal_ctx_csty_symbol)
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{
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int h, v, d;
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h = ((flag & J2K_T1_SIG_E) ? 1:0)+
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((flag & J2K_T1_SIG_W) ? 1:0);
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v = ((flag & J2K_T1_SIG_N) ? 1:0);
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if (!vert_causal_ctx_csty_symbol)
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v = v + ((flag & J2K_T1_SIG_S) ? 1:0);
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d = ((flag & J2K_T1_SIG_NE) ? 1:0)+
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((flag & J2K_T1_SIG_NW) ? 1:0);
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if (!vert_causal_ctx_csty_symbol)
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d = d + ((flag & J2K_T1_SIG_SE) ? 1:0)+
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((flag & J2K_T1_SIG_SW) ? 1:0);
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if (bandno < 3){
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if (bandno == 1)
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FFSWAP(int, h, v);
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if (h == 2) return 8;
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if (h == 1){
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if (v >= 1) return 7;
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if (d >= 1) return 6;
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return 5;
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}
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if (v == 2) return 4;
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if (v == 1) return 3;
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if (d >= 2) return 2;
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if (d == 1) return 1;
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return 0;
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} else{
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if (d >= 3) return 8;
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if (d == 2){
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if (h+v >= 1) return 7;
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return 6;
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}
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if (d == 1){
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if (h+v >= 2) return 5;
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if (h+v == 1) return 4;
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return 3;
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}
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if (h+v >= 2) return 2;
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if (h+v == 1) return 1;
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return 0;
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}
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}
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uint8_t ff_j2k_sgnctxno_lut[16][16], ff_j2k_xorbit_lut[16][16];
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static int getsgnctxno(int flag, uint8_t *xorbit)
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{
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int vcontrib, hcontrib;
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static const int contribtab[3][3] = {{0, -1, 1}, {-1, -1, 0}, {1, 0, 1}};
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static const int ctxlbltab[3][3] = {{13, 12, 11}, {10, 9, 10}, {11, 12, 13}};
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static const int xorbittab[3][3] = {{1, 1, 1,}, {1, 0, 0}, {0, 0, 0}};
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hcontrib = contribtab[flag & J2K_T1_SIG_E ? flag & J2K_T1_SGN_E ? 1:2:0]
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[flag & J2K_T1_SIG_W ? flag & J2K_T1_SGN_W ? 1:2:0]+1;
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vcontrib = contribtab[flag & J2K_T1_SIG_S ? flag & J2K_T1_SGN_S ? 1:2:0]
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[flag & J2K_T1_SIG_N ? flag & J2K_T1_SGN_N ? 1:2:0]+1;
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*xorbit = xorbittab[hcontrib][vcontrib];
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return ctxlbltab[hcontrib][vcontrib];
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}
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void ff_j2k_init_tier1_luts(void)
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{
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int i, j;
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for (i = 0; i < 256; i++)
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for (j = 0; j < 4; j++)
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ff_j2k_nbctxno_lut[i][j] = getnbctxno(i, j, 0);
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for (i = 0; i < 16; i++)
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for (j = 0; j < 16; j++)
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ff_j2k_sgnctxno_lut[i][j] = getsgnctxno(i + (j << 8), &ff_j2k_xorbit_lut[i][j]);
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}
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void ff_j2k_set_significant(J2kT1Context *t1, int x, int y, int negative)
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{
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x++; y++;
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t1->flags[y][x] |= J2K_T1_SIG;
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if (negative){
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t1->flags[y][x+1] |= J2K_T1_SIG_W | J2K_T1_SGN_W;
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t1->flags[y][x-1] |= J2K_T1_SIG_E | J2K_T1_SGN_E;
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t1->flags[y+1][x] |= J2K_T1_SIG_N | J2K_T1_SGN_N;
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t1->flags[y-1][x] |= J2K_T1_SIG_S | J2K_T1_SGN_S;
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} else{
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t1->flags[y][x+1] |= J2K_T1_SIG_W;
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t1->flags[y][x-1] |= J2K_T1_SIG_E;
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t1->flags[y+1][x] |= J2K_T1_SIG_N;
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t1->flags[y-1][x] |= J2K_T1_SIG_S;
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}
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t1->flags[y+1][x+1] |= J2K_T1_SIG_NW;
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t1->flags[y+1][x-1] |= J2K_T1_SIG_NE;
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t1->flags[y-1][x+1] |= J2K_T1_SIG_SW;
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t1->flags[y-1][x-1] |= J2K_T1_SIG_SE;
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}
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int ff_j2k_init_component(J2kComponent *comp, J2kCodingStyle *codsty, J2kQuantStyle *qntsty, int cbps, int dx, int dy)
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{
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int reslevelno, bandno, gbandno = 0, ret, i, j, csize = 1;
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if (ret=ff_j2k_dwt_init(&comp->dwt, comp->coord, codsty->nreslevels-1, codsty->transform))
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return ret;
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for (i = 0; i < 2; i++)
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csize *= comp->coord[i][1] - comp->coord[i][0];
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comp->data = av_malloc(csize * sizeof(int));
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if (!comp->data)
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return AVERROR(ENOMEM);
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comp->reslevel = av_malloc(codsty->nreslevels * sizeof(J2kResLevel));
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if (!comp->reslevel)
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return AVERROR(ENOMEM);
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for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
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int declvl = codsty->nreslevels - reslevelno;
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J2kResLevel *reslevel = comp->reslevel + reslevelno;
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for (i = 0; i < 2; i++)
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for (j = 0; j < 2; j++)
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reslevel->coord[i][j] =
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ff_j2k_ceildivpow2(comp->coord[i][j], declvl - 1);
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if (reslevelno == 0)
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reslevel->nbands = 1;
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else
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reslevel->nbands = 3;
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if (reslevel->coord[0][1] == reslevel->coord[0][0])
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reslevel->num_precincts_x = 0;
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else
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reslevel->num_precincts_x = ff_j2k_ceildivpow2(reslevel->coord[0][1], codsty->log2_prec_width)
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- (reslevel->coord[0][0] >> codsty->log2_prec_width);
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if (reslevel->coord[1][1] == reslevel->coord[1][0])
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reslevel->num_precincts_y = 0;
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else
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reslevel->num_precincts_y = ff_j2k_ceildivpow2(reslevel->coord[1][1], codsty->log2_prec_height)
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- (reslevel->coord[1][0] >> codsty->log2_prec_height);
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reslevel->band = av_malloc(reslevel->nbands * sizeof(J2kBand));
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if (!reslevel->band)
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return AVERROR(ENOMEM);
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for (bandno = 0; bandno < reslevel->nbands; bandno++, gbandno++){
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J2kBand *band = reslevel->band + bandno;
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int cblkno, precx, precy, precno;
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int x0, y0, x1, y1;
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int xi0, yi0, xi1, yi1;
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int cblkperprecw, cblkperprech;
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if (qntsty->quantsty != J2K_QSTY_NONE){
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static const uint8_t lut_gain[2][4] = {{0, 0, 0, 0}, {0, 1, 1, 2}};
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int numbps;
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numbps = cbps + lut_gain[codsty->transform][bandno + reslevelno>0];
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band->stepsize = SHL(2048 + qntsty->mant[gbandno], 2 + numbps - qntsty->expn[gbandno]);
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} else
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band->stepsize = 1 << 13;
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if (reslevelno == 0){ // the same everywhere
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band->codeblock_width = 1 << FFMIN(codsty->log2_cblk_width, codsty->log2_prec_width-1);
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band->codeblock_height = 1 << FFMIN(codsty->log2_cblk_height, codsty->log2_prec_height-1);
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for (i = 0; i < 2; i++)
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for (j = 0; j < 2; j++)
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band->coord[i][j] = ff_j2k_ceildivpow2(comp->coord[i][j], declvl-1);
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} else{
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band->codeblock_width = 1 << FFMIN(codsty->log2_cblk_width, codsty->log2_prec_width);
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band->codeblock_height = 1 << FFMIN(codsty->log2_cblk_height, codsty->log2_prec_height);
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for (i = 0; i < 2; i++)
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for (j = 0; j < 2; j++)
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band->coord[i][j] = ff_j2k_ceildivpow2(comp->coord[i][j] - (((bandno+1>>i)&1) << declvl-1), declvl);
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}
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band->cblknx = ff_j2k_ceildiv(band->coord[0][1], band->codeblock_width) - band->coord[0][0] / band->codeblock_width;
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band->cblkny = ff_j2k_ceildiv(band->coord[1][1], band->codeblock_height) - band->coord[1][0] / band->codeblock_height;
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for (j = 0; j < 2; j++)
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band->coord[0][j] = ff_j2k_ceildiv(band->coord[0][j], dx);
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for (j = 0; j < 2; j++)
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band->coord[1][j] = ff_j2k_ceildiv(band->coord[1][j], dy);
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band->cblknx = ff_j2k_ceildiv(band->cblknx, dx);
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band->cblkny = ff_j2k_ceildiv(band->cblkny, dy);
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band->cblk = av_malloc(band->cblknx * band->cblkny * sizeof(J2kCblk));
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if (!band->cblk)
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return AVERROR(ENOMEM);
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band->prec = av_malloc(reslevel->num_precincts_x * reslevel->num_precincts_y * sizeof(J2kPrec));
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if (!band->prec)
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return AVERROR(ENOMEM);
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for (cblkno = 0; cblkno < band->cblknx * band->cblkny; cblkno++){
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J2kCblk *cblk = band->cblk + cblkno;
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cblk->zero = 0;
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cblk->lblock = 3;
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cblk->length = 0;
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cblk->lengthinc = 0;
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cblk->npasses = 0;
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}
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y0 = band->coord[1][0];
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y1 = ((band->coord[1][0] + (1<<codsty->log2_prec_height)) & ~((1<<codsty->log2_prec_height)-1)) - y0;
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yi0 = 0;
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yi1 = ff_j2k_ceildivpow2(y1 - y0, codsty->log2_cblk_height) << codsty->log2_cblk_height;
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yi1 = FFMIN(yi1, band->cblkny);
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cblkperprech = 1<<(codsty->log2_prec_height - codsty->log2_cblk_height);
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for (precy = 0, precno = 0; precy < reslevel->num_precincts_y; precy++){
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for (precx = 0; precx < reslevel->num_precincts_x; precx++, precno++){
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band->prec[precno].yi0 = yi0;
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band->prec[precno].yi1 = yi1;
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}
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yi1 += cblkperprech;
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yi0 = yi1 - cblkperprech;
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yi1 = FFMIN(yi1, band->cblkny);
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}
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x0 = band->coord[0][0];
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x1 = ((band->coord[0][0] + (1<<codsty->log2_prec_width)) & ~((1<<codsty->log2_prec_width)-1)) - x0;
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xi0 = 0;
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xi1 = ff_j2k_ceildivpow2(x1 - x0, codsty->log2_cblk_width) << codsty->log2_cblk_width;
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xi1 = FFMIN(xi1, band->cblknx);
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cblkperprecw = 1<<(codsty->log2_prec_width - codsty->log2_cblk_width);
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for (precx = 0, precno = 0; precx < reslevel->num_precincts_x; precx++){
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for (precy = 0; precy < reslevel->num_precincts_y; precy++, precno = 0){
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J2kPrec *prec = band->prec + precno;
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prec->xi0 = xi0;
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prec->xi1 = xi1;
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prec->cblkincl = ff_j2k_tag_tree_init(prec->xi1 - prec->xi0,
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prec->yi1 - prec->yi0);
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prec->zerobits = ff_j2k_tag_tree_init(prec->xi1 - prec->xi0,
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prec->yi1 - prec->yi0);
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if (!prec->cblkincl || !prec->zerobits)
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return AVERROR(ENOMEM);
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}
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xi1 += cblkperprecw;
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xi0 = xi1 - cblkperprecw;
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xi1 = FFMIN(xi1, band->cblknx);
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}
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}
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}
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return 0;
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}
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void ff_j2k_reinit(J2kComponent *comp, J2kCodingStyle *codsty)
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{
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int reslevelno, bandno, cblkno, precno;
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for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
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J2kResLevel *rlevel = comp->reslevel + reslevelno;
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for (bandno = 0; bandno < rlevel->nbands; bandno++){
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J2kBand *band = rlevel->band + bandno;
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for(precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++){
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J2kPrec *prec = band->prec + precno;
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tag_tree_zero(prec->zerobits, prec->xi1 - prec->xi0, prec->yi1 - prec->yi0);
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tag_tree_zero(prec->cblkincl, prec->xi1 - prec->xi0, prec->yi1 - prec->yi0);
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}
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for (cblkno = 0; cblkno < band->cblknx * band->cblkny; cblkno++){
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J2kCblk *cblk = band->cblk + cblkno;
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cblk->length = 0;
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cblk->lblock = 3;
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}
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}
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}
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}
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void ff_j2k_cleanup(J2kComponent *comp, J2kCodingStyle *codsty)
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{
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int reslevelno, bandno, precno;
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for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
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J2kResLevel *reslevel = comp->reslevel + reslevelno;
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for (bandno = 0; bandno < reslevel->nbands ; bandno++){
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J2kBand *band = reslevel->band + bandno;
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for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++){
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J2kPrec *prec = band->prec + precno;
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av_freep(&prec->zerobits);
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av_freep(&prec->cblkincl);
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}
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av_freep(&band->cblk);
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av_freep(&band->prec);
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}
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av_freep(&reslevel->band);
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}
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ff_j2k_dwt_destroy(&comp->dwt);
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av_freep(&comp->reslevel);
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av_freep(&comp->data);
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}
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