j2k.c 13.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
/*
 * 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];

108
static int getnbctxno(int flag, int bandno, int vert_causal_ctx_csty_symbol)
109 110 111 112 113
{
    int h, v, d;

    h = ((flag & J2K_T1_SIG_E) ? 1:0)+
        ((flag & J2K_T1_SIG_W) ? 1:0);
114 115 116
    v = ((flag & J2K_T1_SIG_N) ? 1:0);
    if (!vert_causal_ctx_csty_symbol)
         v = v + ((flag & J2K_T1_SIG_S) ? 1:0);
117
    d = ((flag & J2K_T1_SIG_NE) ? 1:0)+
118 119 120 121
        ((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);
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170
    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;
    }
    assert(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];
}

171
void ff_j2k_init_tier1_luts(void)
172 173 174 175
{
    int i, j;
    for (i = 0; i < 256; i++)
        for (j = 0; j < 4; j++)
176
            ff_j2k_nbctxno_lut[i][j] = getnbctxno(i, j, 0);
177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392
    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);
}