yading@10: /*
yading@10:  * JPEG2000 encoder and decoder common functions
yading@10:  * Copyright (c) 2007 Kamil Nowosad
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * JPEG2000 image encoder and decoder common functions
yading@10:  * @file
yading@10:  * @author Kamil Nowosad
yading@10:  */
yading@10: 
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "j2k.h"
yading@10: 
yading@10: #define SHL(a, n) ((n)>=0 ? (a) << (n) : (a) >> -(n))
yading@10: 
yading@10: #if 0
yading@10: void ff_j2k_printv(int *tab, int l)
yading@10: {
yading@10:     int i;
yading@10:     for (i = 0; i < l; i++)
yading@10:         av_log(NULL, AV_LOG_DEBUG, "%.3d ", tab[i]);
yading@10:     av_log(NULL, AV_LOG_DEBUG, "\n");
yading@10: }
yading@10: 
yading@10: void ff_j2k_printu(uint8_t *tab, int l)
yading@10: {
yading@10:     int i;
yading@10:     for (i = 0; i < l; i++)
yading@10:         av_log(NULL, AV_LOG_DEBUG, "%.3hd ", tab[i]);
yading@10:     av_log(NULL, AV_LOG_DEBUG, "\n");
yading@10: }
yading@10: #endif
yading@10: 
yading@10: /* tag tree routines */
yading@10: 
yading@10: /** allocate the memory for tag tree */
yading@10: 
yading@10: static int tag_tree_size(int w, int h)
yading@10: {
yading@10:     int res = 0;
yading@10:     while (w > 1 || h > 1){
yading@10:         res += w * h;
yading@10:         w = (w+1) >> 1;
yading@10:         h = (h+1) >> 1;
yading@10:     }
yading@10:     return res + 1;
yading@10: }
yading@10: 
yading@10: J2kTgtNode *ff_j2k_tag_tree_init(int w, int h)
yading@10: {
yading@10:     int pw = w, ph = h;
yading@10:     J2kTgtNode *res, *t, *t2;
yading@10: 
yading@10:     t = res = av_mallocz(tag_tree_size(w, h)*sizeof(J2kTgtNode));
yading@10: 
yading@10:     if (res == NULL)
yading@10:         return NULL;
yading@10: 
yading@10:     while (w > 1 || h > 1){
yading@10:         int i, j;
yading@10:         pw = w;
yading@10:         ph = h;
yading@10: 
yading@10:         w = (w+1) >> 1;
yading@10:         h = (h+1) >> 1;
yading@10:         t2 = t + pw*ph;
yading@10: 
yading@10:         for (i = 0; i < ph; i++)
yading@10:             for (j = 0; j < pw; j++){
yading@10:                 t[i*pw + j].parent = &t2[(i>>1)*w + (j>>1)];
yading@10:             }
yading@10:         t = t2;
yading@10:     }
yading@10:     t[0].parent = NULL;
yading@10:     return res;
yading@10: }
yading@10: 
yading@10: static void tag_tree_zero(J2kTgtNode *t, int w, int h)
yading@10: {
yading@10:     int i, siz = tag_tree_size(w, h);
yading@10: 
yading@10:     for (i = 0; i < siz; i++){
yading@10:         t[i].val = 0;
yading@10:         t[i].vis = 0;
yading@10:     }
yading@10: }
yading@10: 
yading@10: uint8_t ff_j2k_nbctxno_lut[256][4];
yading@10: 
yading@10: static int getnbctxno(int flag, int bandno, int vert_causal_ctx_csty_symbol)
yading@10: {
yading@10:     int h, v, d;
yading@10: 
yading@10:     h = ((flag & J2K_T1_SIG_E) ? 1:0)+
yading@10:         ((flag & J2K_T1_SIG_W) ? 1:0);
yading@10:     v = ((flag & J2K_T1_SIG_N) ? 1:0);
yading@10:     if (!vert_causal_ctx_csty_symbol)
yading@10:          v = v + ((flag & J2K_T1_SIG_S) ? 1:0);
yading@10:     d = ((flag & J2K_T1_SIG_NE) ? 1:0)+
yading@10:         ((flag & J2K_T1_SIG_NW) ? 1:0);
yading@10:     if (!vert_causal_ctx_csty_symbol)
yading@10:         d = d + ((flag & J2K_T1_SIG_SE) ? 1:0)+
yading@10:                 ((flag & J2K_T1_SIG_SW) ? 1:0);
yading@10:     if (bandno < 3){
yading@10:             if (bandno == 1)
yading@10:                 FFSWAP(int, h, v);
yading@10:             if (h == 2) return 8;
yading@10:             if (h == 1){
yading@10:                 if (v >= 1) return 7;
yading@10:                 if (d >= 1) return 6;
yading@10:                 return 5;
yading@10:             }
yading@10:             if (v == 2) return 4;
yading@10:             if (v == 1) return 3;
yading@10:             if (d >= 2) return 2;
yading@10:             if (d == 1) return 1;
yading@10:             return 0;
yading@10:     } else{
yading@10:             if (d >= 3) return 8;
yading@10:             if (d == 2){
yading@10:                 if (h+v >= 1) return 7;
yading@10:                 return 6;
yading@10:             }
yading@10:             if (d == 1){
yading@10:                 if (h+v >= 2) return 5;
yading@10:                 if (h+v == 1) return 4;
yading@10:                 return 3;
yading@10:             }
yading@10:             if (h+v >= 2) return 2;
yading@10:             if (h+v == 1) return 1;
yading@10:             return 0;
yading@10:     }
yading@10: }
yading@10: 
yading@10: uint8_t ff_j2k_sgnctxno_lut[16][16], ff_j2k_xorbit_lut[16][16];
yading@10: 
yading@10: static int getsgnctxno(int flag, uint8_t *xorbit)
yading@10: {
yading@10:     int vcontrib, hcontrib;
yading@10:     static const int contribtab[3][3] = {{0, -1, 1}, {-1, -1, 0}, {1, 0, 1}};
yading@10:     static const int ctxlbltab[3][3] = {{13, 12, 11}, {10, 9, 10}, {11, 12, 13}};
yading@10:     static const int xorbittab[3][3] = {{1, 1, 1,}, {1, 0, 0}, {0, 0, 0}};
yading@10: 
yading@10:     hcontrib = contribtab[flag & J2K_T1_SIG_E ? flag & J2K_T1_SGN_E ? 1:2:0]
yading@10:                          [flag & J2K_T1_SIG_W ? flag & J2K_T1_SGN_W ? 1:2:0]+1;
yading@10:     vcontrib = contribtab[flag & J2K_T1_SIG_S ? flag & J2K_T1_SGN_S ? 1:2:0]
yading@10:                          [flag & J2K_T1_SIG_N ? flag & J2K_T1_SGN_N ? 1:2:0]+1;
yading@10:     *xorbit = xorbittab[hcontrib][vcontrib];
yading@10:     return ctxlbltab[hcontrib][vcontrib];
yading@10: }
yading@10: 
yading@10: void ff_j2k_init_tier1_luts(void)
yading@10: {
yading@10:     int i, j;
yading@10:     for (i = 0; i < 256; i++)
yading@10:         for (j = 0; j < 4; j++)
yading@10:             ff_j2k_nbctxno_lut[i][j] = getnbctxno(i, j, 0);
yading@10:     for (i = 0; i < 16; i++)
yading@10:         for (j = 0; j < 16; j++)
yading@10:             ff_j2k_sgnctxno_lut[i][j] = getsgnctxno(i + (j << 8), &ff_j2k_xorbit_lut[i][j]);
yading@10: }
yading@10: 
yading@10: void ff_j2k_set_significant(J2kT1Context *t1, int x, int y, int negative)
yading@10: {
yading@10:     x++; y++;
yading@10:     t1->flags[y][x] |= J2K_T1_SIG;
yading@10:     if (negative){
yading@10:         t1->flags[y][x+1] |= J2K_T1_SIG_W | J2K_T1_SGN_W;
yading@10:         t1->flags[y][x-1] |= J2K_T1_SIG_E | J2K_T1_SGN_E;
yading@10:         t1->flags[y+1][x] |= J2K_T1_SIG_N | J2K_T1_SGN_N;
yading@10:         t1->flags[y-1][x] |= J2K_T1_SIG_S | J2K_T1_SGN_S;
yading@10:     } else{
yading@10:         t1->flags[y][x+1] |= J2K_T1_SIG_W;
yading@10:         t1->flags[y][x-1] |= J2K_T1_SIG_E;
yading@10:         t1->flags[y+1][x] |= J2K_T1_SIG_N;
yading@10:         t1->flags[y-1][x] |= J2K_T1_SIG_S;
yading@10:     }
yading@10:     t1->flags[y+1][x+1] |= J2K_T1_SIG_NW;
yading@10:     t1->flags[y+1][x-1] |= J2K_T1_SIG_NE;
yading@10:     t1->flags[y-1][x+1] |= J2K_T1_SIG_SW;
yading@10:     t1->flags[y-1][x-1] |= J2K_T1_SIG_SE;
yading@10: }
yading@10: 
yading@10: int ff_j2k_init_component(J2kComponent *comp, J2kCodingStyle *codsty, J2kQuantStyle *qntsty, int cbps, int dx, int dy)
yading@10: {
yading@10:     int reslevelno, bandno, gbandno = 0, ret, i, j, csize = 1;
yading@10: 
yading@10:     if (ret=ff_j2k_dwt_init(&comp->dwt, comp->coord, codsty->nreslevels-1, codsty->transform))
yading@10:         return ret;
yading@10:     for (i = 0; i < 2; i++)
yading@10:         csize *= comp->coord[i][1] - comp->coord[i][0];
yading@10: 
yading@10:     comp->data = av_malloc(csize * sizeof(int));
yading@10:     if (!comp->data)
yading@10:         return AVERROR(ENOMEM);
yading@10:     comp->reslevel = av_malloc(codsty->nreslevels * sizeof(J2kResLevel));
yading@10: 
yading@10:     if (!comp->reslevel)
yading@10:         return AVERROR(ENOMEM);
yading@10:     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
yading@10:         int declvl = codsty->nreslevels - reslevelno;
yading@10:         J2kResLevel *reslevel = comp->reslevel + reslevelno;
yading@10: 
yading@10:         for (i = 0; i < 2; i++)
yading@10:             for (j = 0; j < 2; j++)
yading@10:                 reslevel->coord[i][j] =
yading@10:                     ff_j2k_ceildivpow2(comp->coord[i][j], declvl - 1);
yading@10: 
yading@10:         if (reslevelno == 0)
yading@10:             reslevel->nbands = 1;
yading@10:         else
yading@10:             reslevel->nbands = 3;
yading@10: 
yading@10:         if (reslevel->coord[0][1] == reslevel->coord[0][0])
yading@10:             reslevel->num_precincts_x = 0;
yading@10:         else
yading@10:             reslevel->num_precincts_x = ff_j2k_ceildivpow2(reslevel->coord[0][1], codsty->log2_prec_width)
yading@10:                                         - (reslevel->coord[0][0] >> codsty->log2_prec_width);
yading@10: 
yading@10:         if (reslevel->coord[1][1] == reslevel->coord[1][0])
yading@10:             reslevel->num_precincts_y = 0;
yading@10:         else
yading@10:             reslevel->num_precincts_y = ff_j2k_ceildivpow2(reslevel->coord[1][1], codsty->log2_prec_height)
yading@10:                                         - (reslevel->coord[1][0] >> codsty->log2_prec_height);
yading@10: 
yading@10:         reslevel->band = av_malloc(reslevel->nbands * sizeof(J2kBand));
yading@10:         if (!reslevel->band)
yading@10:             return AVERROR(ENOMEM);
yading@10:         for (bandno = 0; bandno < reslevel->nbands; bandno++, gbandno++){
yading@10:             J2kBand *band = reslevel->band + bandno;
yading@10:             int cblkno, precx, precy, precno;
yading@10:             int x0, y0, x1, y1;
yading@10:             int xi0, yi0, xi1, yi1;
yading@10:             int cblkperprecw, cblkperprech;
yading@10: 
yading@10:             if (qntsty->quantsty != J2K_QSTY_NONE){
yading@10:                 static const uint8_t lut_gain[2][4] = {{0, 0, 0, 0}, {0, 1, 1, 2}};
yading@10:                 int numbps;
yading@10: 
yading@10:                 numbps = cbps + lut_gain[codsty->transform][bandno + reslevelno>0];
yading@10:                 band->stepsize = SHL(2048 + qntsty->mant[gbandno], 2 + numbps - qntsty->expn[gbandno]);
yading@10:             } else
yading@10:                 band->stepsize = 1 << 13;
yading@10: 
yading@10:             if (reslevelno == 0){  // the same everywhere
yading@10:                 band->codeblock_width = 1 << FFMIN(codsty->log2_cblk_width, codsty->log2_prec_width-1);
yading@10:                 band->codeblock_height = 1 << FFMIN(codsty->log2_cblk_height, codsty->log2_prec_height-1);
yading@10:                 for (i = 0; i < 2; i++)
yading@10:                     for (j = 0; j < 2; j++)
yading@10:                         band->coord[i][j] = ff_j2k_ceildivpow2(comp->coord[i][j], declvl-1);
yading@10:             } else{
yading@10:                 band->codeblock_width = 1 << FFMIN(codsty->log2_cblk_width, codsty->log2_prec_width);
yading@10:                 band->codeblock_height = 1 << FFMIN(codsty->log2_cblk_height, codsty->log2_prec_height);
yading@10: 
yading@10:                 for (i = 0; i < 2; i++)
yading@10:                     for (j = 0; j < 2; j++)
yading@10:                         band->coord[i][j] = ff_j2k_ceildivpow2(comp->coord[i][j] - (((bandno+1>>i)&1) << declvl-1), declvl);
yading@10:             }
yading@10:             band->cblknx = ff_j2k_ceildiv(band->coord[0][1], band->codeblock_width)  - band->coord[0][0] / band->codeblock_width;
yading@10:             band->cblkny = ff_j2k_ceildiv(band->coord[1][1], band->codeblock_height) - band->coord[1][0] / band->codeblock_height;
yading@10: 
yading@10:             for (j = 0; j < 2; j++)
yading@10:                 band->coord[0][j] = ff_j2k_ceildiv(band->coord[0][j], dx);
yading@10:             for (j = 0; j < 2; j++)
yading@10:                 band->coord[1][j] = ff_j2k_ceildiv(band->coord[1][j], dy);
yading@10: 
yading@10:             band->cblknx = ff_j2k_ceildiv(band->cblknx, dx);
yading@10:             band->cblkny = ff_j2k_ceildiv(band->cblkny, dy);
yading@10: 
yading@10:             band->cblk = av_malloc(sizeof(J2kCblk) * band->cblknx * band->cblkny);
yading@10:             if (!band->cblk)
yading@10:                 return AVERROR(ENOMEM);
yading@10:             band->prec = av_malloc(sizeof(J2kCblk) * reslevel->num_precincts_x * reslevel->num_precincts_y);
yading@10:             if (!band->prec)
yading@10:                 return AVERROR(ENOMEM);
yading@10: 
yading@10:             for (cblkno = 0; cblkno < band->cblknx * band->cblkny; cblkno++){
yading@10:                 J2kCblk *cblk = band->cblk + cblkno;
yading@10:                 cblk->zero = 0;
yading@10:                 cblk->lblock = 3;
yading@10:                 cblk->length = 0;
yading@10:                 cblk->lengthinc = 0;
yading@10:                 cblk->npasses = 0;
yading@10:             }
yading@10: 
yading@10:             y0 = band->coord[1][0];
yading@10:             y1 = ((band->coord[1][0] + (1<<codsty->log2_prec_height)) & ~((1<<codsty->log2_prec_height)-1)) - y0;
yading@10:             yi0 = 0;
yading@10:             yi1 = ff_j2k_ceildivpow2(y1 - y0, codsty->log2_cblk_height) << codsty->log2_cblk_height;
yading@10:             yi1 = FFMIN(yi1, band->cblkny);
yading@10:             cblkperprech = 1<<(codsty->log2_prec_height - codsty->log2_cblk_height);
yading@10:             for (precy = 0, precno = 0; precy < reslevel->num_precincts_y; precy++){
yading@10:                 for (precx = 0; precx < reslevel->num_precincts_x; precx++, precno++){
yading@10:                     band->prec[precno].yi0 = yi0;
yading@10:                     band->prec[precno].yi1 = yi1;
yading@10:                 }
yading@10:                 yi1 += cblkperprech;
yading@10:                 yi0 = yi1 - cblkperprech;
yading@10:                 yi1 = FFMIN(yi1, band->cblkny);
yading@10:             }
yading@10:             x0 = band->coord[0][0];
yading@10:             x1 = ((band->coord[0][0] + (1<<codsty->log2_prec_width)) & ~((1<<codsty->log2_prec_width)-1)) - x0;
yading@10:             xi0 = 0;
yading@10:             xi1 = ff_j2k_ceildivpow2(x1 - x0, codsty->log2_cblk_width) << codsty->log2_cblk_width;
yading@10:             xi1 = FFMIN(xi1, band->cblknx);
yading@10: 
yading@10:             cblkperprecw = 1<<(codsty->log2_prec_width - codsty->log2_cblk_width);
yading@10:             for (precx = 0, precno = 0; precx < reslevel->num_precincts_x; precx++){
yading@10:                 for (precy = 0; precy < reslevel->num_precincts_y; precy++, precno = 0){
yading@10:                     J2kPrec *prec = band->prec + precno;
yading@10:                     prec->xi0 = xi0;
yading@10:                     prec->xi1 = xi1;
yading@10:                     prec->cblkincl = ff_j2k_tag_tree_init(prec->xi1 - prec->xi0,
yading@10:                                                           prec->yi1 - prec->yi0);
yading@10:                     prec->zerobits = ff_j2k_tag_tree_init(prec->xi1 - prec->xi0,
yading@10:                                                           prec->yi1 - prec->yi0);
yading@10:                     if (!prec->cblkincl || !prec->zerobits)
yading@10:                         return AVERROR(ENOMEM);
yading@10: 
yading@10:                 }
yading@10:                 xi1 += cblkperprecw;
yading@10:                 xi0 = xi1 - cblkperprecw;
yading@10:                 xi1 = FFMIN(xi1, band->cblknx);
yading@10:             }
yading@10:         }
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: void ff_j2k_reinit(J2kComponent *comp, J2kCodingStyle *codsty)
yading@10: {
yading@10:     int reslevelno, bandno, cblkno, precno;
yading@10:     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
yading@10:         J2kResLevel *rlevel = comp->reslevel + reslevelno;
yading@10:         for (bandno = 0; bandno < rlevel->nbands; bandno++){
yading@10:             J2kBand *band = rlevel->band + bandno;
yading@10:             for(precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++){
yading@10:                 J2kPrec *prec = band->prec + precno;
yading@10:                 tag_tree_zero(prec->zerobits, prec->xi1 - prec->xi0, prec->yi1 - prec->yi0);
yading@10:                 tag_tree_zero(prec->cblkincl, prec->xi1 - prec->xi0, prec->yi1 - prec->yi0);
yading@10:             }
yading@10:             for (cblkno = 0; cblkno < band->cblknx * band->cblkny; cblkno++){
yading@10:                 J2kCblk *cblk = band->cblk + cblkno;
yading@10:                 cblk->length = 0;
yading@10:                 cblk->lblock = 3;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: void ff_j2k_cleanup(J2kComponent *comp, J2kCodingStyle *codsty)
yading@10: {
yading@10:     int reslevelno, bandno, precno;
yading@10:     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
yading@10:         J2kResLevel *reslevel = comp->reslevel + reslevelno;
yading@10: 
yading@10:         for (bandno = 0; bandno < reslevel->nbands ; bandno++){
yading@10:             J2kBand *band = reslevel->band + bandno;
yading@10:                 for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++){
yading@10:                     J2kPrec *prec = band->prec + precno;
yading@10:                     av_freep(&prec->zerobits);
yading@10:                     av_freep(&prec->cblkincl);
yading@10:                 }
yading@10:                 av_freep(&band->cblk);
yading@10:                 av_freep(&band->prec);
yading@10:             }
yading@10:         av_freep(&reslevel->band);
yading@10:     }
yading@10: 
yading@10:     ff_j2k_dwt_destroy(&comp->dwt);
yading@10:     av_freep(&comp->reslevel);
yading@10:     av_freep(&comp->data);
yading@10: }