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libavcodec/j2k.c

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00001 /*
00002  * JPEG2000 encoder and decoder common functions
00003  * Copyright (c) 2007 Kamil Nowosad
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00029 #include "avcodec.h"
00030 #include "j2k.h"
00031 
00032 #define SHL(a, n) ((n)>=0 ? (a) << (n) : (a) >> -(n))
00033 
00034 #if 0
00035 void ff_j2k_printv(int *tab, int l)
00036 {
00037     int i;
00038     for (i = 0; i < l; i++)
00039         printf("%.3d ", tab[i]);
00040     printf("\n");
00041 }
00042 
00043 void ff_j2k_printu(uint8_t *tab, int l)
00044 {
00045     int i;
00046     for (i = 0; i < l; i++)
00047         printf("%.3hd ", tab[i]);
00048     printf("\n");
00049 }
00050 #endif
00051 
00052 /* tag tree routines */
00053 
00056 static int tag_tree_size(int w, int h)
00057 {
00058     int res = 0;
00059     while (w > 1 || h > 1){
00060         res += w * h;
00061         w = (w+1) >> 1;
00062         h = (h+1) >> 1;
00063     }
00064     return res + 1;
00065 }
00066 
00067 J2kTgtNode *ff_j2k_tag_tree_init(int w, int h)
00068 {
00069     int pw = w, ph = h;
00070     J2kTgtNode *res, *t, *t2;
00071 
00072     t = res = av_mallocz(tag_tree_size(w, h)*sizeof(J2kTgtNode));
00073 
00074     if (res == NULL)
00075         return NULL;
00076 
00077     while (w > 1 || h > 1){
00078         int i, j;
00079         pw = w;
00080         ph = h;
00081 
00082         w = (w+1) >> 1;
00083         h = (h+1) >> 1;
00084         t2 = t + pw*ph;
00085 
00086         for (i = 0; i < ph; i++)
00087             for (j = 0; j < pw; j++){
00088                 t[i*pw + j].parent = &t2[(i>>1)*w + (j>>1)];
00089             }
00090         t = t2;
00091     }
00092     t[0].parent = NULL;
00093     return res;
00094 }
00095 
00096 static void tag_tree_zero(J2kTgtNode *t, int w, int h)
00097 {
00098     int i, siz = tag_tree_size(w, h);
00099 
00100     for (i = 0; i < siz; i++){
00101         t[i].val = 0;
00102         t[i].vis = 0;
00103     }
00104 }
00105 
00106 uint8_t ff_j2k_nbctxno_lut[256][4];
00107 
00108 static int getnbctxno(int flag, int bandno, int vert_causal_ctx_csty_symbol)
00109 {
00110     int h, v, d;
00111 
00112     h = ((flag & J2K_T1_SIG_E) ? 1:0)+
00113         ((flag & J2K_T1_SIG_W) ? 1:0);
00114     v = ((flag & J2K_T1_SIG_N) ? 1:0);
00115     if (!vert_causal_ctx_csty_symbol)
00116          v = v + ((flag & J2K_T1_SIG_S) ? 1:0);
00117     d = ((flag & J2K_T1_SIG_NE) ? 1:0)+
00118         ((flag & J2K_T1_SIG_NW) ? 1:0);
00119     if (!vert_causal_ctx_csty_symbol)
00120         d = d + ((flag & J2K_T1_SIG_SE) ? 1:0)+
00121                 ((flag & J2K_T1_SIG_SW) ? 1:0);
00122     if (bandno < 3){
00123             if (bandno == 1)
00124                 FFSWAP(int, h, v);
00125             if (h == 2) return 8;
00126             if (h == 1){
00127                 if (v >= 1) return 7;
00128                 if (d >= 1) return 6;
00129                 return 5;
00130             }
00131             if (v == 2) return 4;
00132             if (v == 1) return 3;
00133             if (d >= 2) return 2;
00134             if (d == 1) return 1;
00135             return 0;
00136     } else{
00137             if (d >= 3) return 8;
00138             if (d == 2){
00139                 if (h+v >= 1) return 7;
00140                 return 6;
00141             }
00142             if (d == 1){
00143                 if (h+v >= 2) return 5;
00144                 if (h+v == 1) return 4;
00145                 return 3;
00146             }
00147             if (h+v >= 2) return 2;
00148             if (h+v == 1) return 1;
00149             return 0;
00150     }
00151     assert(0);
00152 }
00153 
00154 uint8_t ff_j2k_sgnctxno_lut[16][16], ff_j2k_xorbit_lut[16][16];
00155 
00156 static int getsgnctxno(int flag, uint8_t *xorbit)
00157 {
00158     int vcontrib, hcontrib;
00159     static const int contribtab[3][3] = {{0, -1, 1}, {-1, -1, 0}, {1, 0, 1}};
00160     static const int ctxlbltab[3][3] = {{13, 12, 11}, {10, 9, 10}, {11, 12, 13}};
00161     static const int xorbittab[3][3] = {{1, 1, 1,}, {1, 0, 0}, {0, 0, 0}};
00162 
00163     hcontrib = contribtab[flag & J2K_T1_SIG_E ? flag & J2K_T1_SGN_E ? 1:2:0]
00164                          [flag & J2K_T1_SIG_W ? flag & J2K_T1_SGN_W ? 1:2:0]+1;
00165     vcontrib = contribtab[flag & J2K_T1_SIG_S ? flag & J2K_T1_SGN_S ? 1:2:0]
00166                          [flag & J2K_T1_SIG_N ? flag & J2K_T1_SGN_N ? 1:2:0]+1;
00167     *xorbit = xorbittab[hcontrib][vcontrib];
00168     return ctxlbltab[hcontrib][vcontrib];
00169 }
00170 
00171 void ff_j2k_init_tier1_luts(void)
00172 {
00173     int i, j;
00174     for (i = 0; i < 256; i++)
00175         for (j = 0; j < 4; j++)
00176             ff_j2k_nbctxno_lut[i][j] = getnbctxno(i, j, 0);
00177     for (i = 0; i < 16; i++)
00178         for (j = 0; j < 16; j++)
00179             ff_j2k_sgnctxno_lut[i][j] = getsgnctxno(i + (j << 8), &ff_j2k_xorbit_lut[i][j]);
00180 }
00181 
00182 void ff_j2k_set_significant(J2kT1Context *t1, int x, int y, int negative)
00183 {
00184     x++; y++;
00185     t1->flags[y][x] |= J2K_T1_SIG;
00186     if (negative){
00187         t1->flags[y][x+1] |= J2K_T1_SIG_W | J2K_T1_SGN_W;
00188         t1->flags[y][x-1] |= J2K_T1_SIG_E | J2K_T1_SGN_E;
00189         t1->flags[y+1][x] |= J2K_T1_SIG_N | J2K_T1_SGN_N;
00190         t1->flags[y-1][x] |= J2K_T1_SIG_S | J2K_T1_SGN_S;
00191     } else{
00192         t1->flags[y][x+1] |= J2K_T1_SIG_W;
00193         t1->flags[y][x-1] |= J2K_T1_SIG_E;
00194         t1->flags[y+1][x] |= J2K_T1_SIG_N;
00195         t1->flags[y-1][x] |= J2K_T1_SIG_S;
00196     }
00197     t1->flags[y+1][x+1] |= J2K_T1_SIG_NW;
00198     t1->flags[y+1][x-1] |= J2K_T1_SIG_NE;
00199     t1->flags[y-1][x+1] |= J2K_T1_SIG_SW;
00200     t1->flags[y-1][x-1] |= J2K_T1_SIG_SE;
00201 }
00202 
00203 int ff_j2k_init_component(J2kComponent *comp, J2kCodingStyle *codsty, J2kQuantStyle *qntsty, int cbps, int dx, int dy)
00204 {
00205     int reslevelno, bandno, gbandno = 0, ret, i, j, csize = 1;
00206 
00207     if (ret=ff_j2k_dwt_init(&comp->dwt, comp->coord, codsty->nreslevels-1, codsty->transform))
00208         return ret;
00209     for (i = 0; i < 2; i++)
00210         csize *= comp->coord[i][1] - comp->coord[i][0];
00211 
00212     comp->data = av_malloc(csize * sizeof(int));
00213     if (!comp->data)
00214         return AVERROR(ENOMEM);
00215     comp->reslevel = av_malloc(codsty->nreslevels * sizeof(J2kResLevel));
00216 
00217     if (!comp->reslevel)
00218         return AVERROR(ENOMEM);
00219     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
00220         int declvl = codsty->nreslevels - reslevelno;
00221         J2kResLevel *reslevel = comp->reslevel + reslevelno;
00222 
00223         for (i = 0; i < 2; i++)
00224             for (j = 0; j < 2; j++)
00225                 reslevel->coord[i][j] =
00226                     ff_j2k_ceildivpow2(comp->coord[i][j], declvl - 1);
00227 
00228         if (reslevelno == 0)
00229             reslevel->nbands = 1;
00230         else
00231             reslevel->nbands = 3;
00232 
00233         if (reslevel->coord[0][1] == reslevel->coord[0][0])
00234             reslevel->num_precincts_x = 0;
00235         else
00236             reslevel->num_precincts_x = ff_j2k_ceildivpow2(reslevel->coord[0][1], codsty->log2_prec_width)
00237                                         - (reslevel->coord[0][0] >> codsty->log2_prec_width);
00238 
00239         if (reslevel->coord[1][1] == reslevel->coord[1][0])
00240             reslevel->num_precincts_y = 0;
00241         else
00242             reslevel->num_precincts_y = ff_j2k_ceildivpow2(reslevel->coord[1][1], codsty->log2_prec_height)
00243                                         - (reslevel->coord[1][0] >> codsty->log2_prec_height);
00244 
00245         reslevel->band = av_malloc(reslevel->nbands * sizeof(J2kBand));
00246         if (!reslevel->band)
00247             return AVERROR(ENOMEM);
00248         for (bandno = 0; bandno < reslevel->nbands; bandno++, gbandno++){
00249             J2kBand *band = reslevel->band + bandno;
00250             int cblkno, precx, precy, precno;
00251             int x0, y0, x1, y1;
00252             int xi0, yi0, xi1, yi1;
00253             int cblkperprecw, cblkperprech;
00254 
00255             if (qntsty->quantsty != J2K_QSTY_NONE){
00256                 const static uint8_t lut_gain[2][4] = {{0, 0, 0, 0}, {0, 1, 1, 2}};
00257                 int numbps;
00258 
00259                 numbps = cbps + lut_gain[codsty->transform][bandno + reslevelno>0];
00260                 band->stepsize = SHL(2048 + qntsty->mant[gbandno], 2 + numbps - qntsty->expn[gbandno]);
00261             } else
00262                 band->stepsize = 1 << 13;
00263 
00264             if (reslevelno == 0){  // the same everywhere
00265                 band->codeblock_width = 1 << FFMIN(codsty->log2_cblk_width, codsty->log2_prec_width-1);
00266                 band->codeblock_height = 1 << FFMIN(codsty->log2_cblk_height, codsty->log2_prec_height-1);
00267                 for (i = 0; i < 2; i++)
00268                     for (j = 0; j < 2; j++)
00269                         band->coord[i][j] = ff_j2k_ceildivpow2(comp->coord[i][j], declvl-1);
00270             } else{
00271                 band->codeblock_width = 1 << FFMIN(codsty->log2_cblk_width, codsty->log2_prec_width);
00272                 band->codeblock_height = 1 << FFMIN(codsty->log2_cblk_height, codsty->log2_prec_height);
00273 
00274                 for (i = 0; i < 2; i++)
00275                     for (j = 0; j < 2; j++)
00276                         band->coord[i][j] = ff_j2k_ceildivpow2(comp->coord[i][j] - (((bandno+1>>i)&1) << declvl-1), declvl);
00277             }
00278             band->cblknx = ff_j2k_ceildiv(band->coord[0][1], band->codeblock_width)  - band->coord[0][0] / band->codeblock_width;
00279             band->cblkny = ff_j2k_ceildiv(band->coord[1][1], band->codeblock_height) - band->coord[1][0] / band->codeblock_height;
00280 
00281             for (j = 0; j < 2; j++)
00282                 band->coord[0][j] = ff_j2k_ceildiv(band->coord[0][j], dx);
00283             for (j = 0; j < 2; j++)
00284                 band->coord[1][j] = ff_j2k_ceildiv(band->coord[1][j], dy);
00285 
00286             band->cblknx = ff_j2k_ceildiv(band->cblknx, dx);
00287             band->cblkny = ff_j2k_ceildiv(band->cblkny, dy);
00288 
00289             band->cblk = av_malloc(band->cblknx * band->cblkny * sizeof(J2kCblk));
00290             if (!band->cblk)
00291                 return AVERROR(ENOMEM);
00292             band->prec = av_malloc(reslevel->num_precincts_x * reslevel->num_precincts_y * sizeof(J2kPrec));
00293             if (!band->prec)
00294                 return AVERROR(ENOMEM);
00295 
00296             for (cblkno = 0; cblkno < band->cblknx * band->cblkny; cblkno++){
00297                 J2kCblk *cblk = band->cblk + cblkno;
00298                 cblk->zero = 0;
00299                 cblk->lblock = 3;
00300                 cblk->length = 0;
00301                 cblk->lengthinc = 0;
00302                 cblk->npasses = 0;
00303             }
00304 
00305             y0 = band->coord[1][0];
00306             y1 = ((band->coord[1][0] + (1<<codsty->log2_prec_height)) & ~((1<<codsty->log2_prec_height)-1)) - y0;
00307             yi0 = 0;
00308             yi1 = ff_j2k_ceildivpow2(y1 - y0, codsty->log2_cblk_height) << codsty->log2_cblk_height;
00309             yi1 = FFMIN(yi1, band->cblkny);
00310             cblkperprech = 1<<(codsty->log2_prec_height - codsty->log2_cblk_height);
00311             for (precy = 0, precno = 0; precy < reslevel->num_precincts_y; precy++){
00312                 for (precx = 0; precx < reslevel->num_precincts_x; precx++, precno++){
00313                     band->prec[precno].yi0 = yi0;
00314                     band->prec[precno].yi1 = yi1;
00315                 }
00316                 yi1 += cblkperprech;
00317                 yi0 = yi1 - cblkperprech;
00318                 yi1 = FFMIN(yi1, band->cblkny);
00319             }
00320             x0 = band->coord[0][0];
00321             x1 = ((band->coord[0][0] + (1<<codsty->log2_prec_width)) & ~((1<<codsty->log2_prec_width)-1)) - x0;
00322             xi0 = 0;
00323             xi1 = ff_j2k_ceildivpow2(x1 - x0, codsty->log2_cblk_width) << codsty->log2_cblk_width;
00324             xi1 = FFMIN(xi1, band->cblknx);
00325 
00326             cblkperprecw = 1<<(codsty->log2_prec_width - codsty->log2_cblk_width);
00327             for (precx = 0, precno = 0; precx < reslevel->num_precincts_x; precx++){
00328                 for (precy = 0; precy < reslevel->num_precincts_y; precy++, precno = 0){
00329                     J2kPrec *prec = band->prec + precno;
00330                     prec->xi0 = xi0;
00331                     prec->xi1 = xi1;
00332                     prec->cblkincl = ff_j2k_tag_tree_init(prec->xi1 - prec->xi0,
00333                                                           prec->yi1 - prec->yi0);
00334                     prec->zerobits = ff_j2k_tag_tree_init(prec->xi1 - prec->xi0,
00335                                                           prec->yi1 - prec->yi0);
00336                     if (!prec->cblkincl || !prec->zerobits)
00337                         return AVERROR(ENOMEM);
00338 
00339                 }
00340                 xi1 += cblkperprecw;
00341                 xi0 = xi1 - cblkperprecw;
00342                 xi1 = FFMIN(xi1, band->cblknx);
00343             }
00344         }
00345     }
00346     return 0;
00347 }
00348 
00349 void ff_j2k_reinit(J2kComponent *comp, J2kCodingStyle *codsty)
00350 {
00351     int reslevelno, bandno, cblkno, precno;
00352     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
00353         J2kResLevel *rlevel = comp->reslevel + reslevelno;
00354         for (bandno = 0; bandno < rlevel->nbands; bandno++){
00355             J2kBand *band = rlevel->band + bandno;
00356             for(precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++){
00357                 J2kPrec *prec = band->prec + precno;
00358                 tag_tree_zero(prec->zerobits, prec->xi1 - prec->xi0, prec->yi1 - prec->yi0);
00359                 tag_tree_zero(prec->cblkincl, prec->xi1 - prec->xi0, prec->yi1 - prec->yi0);
00360             }
00361             for (cblkno = 0; cblkno < band->cblknx * band->cblkny; cblkno++){
00362                 J2kCblk *cblk = band->cblk + cblkno;
00363                 cblk->length = 0;
00364                 cblk->lblock = 3;
00365             }
00366         }
00367     }
00368 }
00369 
00370 void ff_j2k_cleanup(J2kComponent *comp, J2kCodingStyle *codsty)
00371 {
00372     int reslevelno, bandno, precno;
00373     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
00374         J2kResLevel *reslevel = comp->reslevel + reslevelno;
00375 
00376         for (bandno = 0; bandno < reslevel->nbands ; bandno++){
00377             J2kBand *band = reslevel->band + bandno;
00378                 for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++){
00379                     J2kPrec *prec = band->prec + precno;
00380                     av_freep(&prec->zerobits);
00381                     av_freep(&prec->cblkincl);
00382                 }
00383                 av_freep(&band->cblk);
00384                 av_freep(&band->prec);
00385             }
00386         av_freep(&reslevel->band);
00387     }
00388 
00389     ff_j2k_dwt_destroy(&comp->dwt);
00390     av_freep(&comp->reslevel);
00391     av_freep(&comp->data);
00392 }

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