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FFmpeg/libavcodec/jpeg2000.c

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  1. /*

  2.  * JPEG 2000 encoder and decoder common functions

  3.  * Copyright (c) 2007 Kamil Nowosad

  4.  * Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * JPEG 2000 image encoder and decoder common functions

  26.  */

  27. 

  28. #include "libavutil/common.h"

  29. #include "libavutil/mem.h"

  30. #include "avcodec.h"

  31. #include "jpeg2000.h"

  32. 

  33. #define SHL(a, n) ((n) >= 0 ? (a) << (n) : (a) >> -(n))

  34. 

  35. /* tag tree routines */

  36. 

  37. /* allocate the memory for tag tree */

  38. static int32_t tag_tree_size(uint16_t w, uint16_t h)

  39. {

  40.     uint32_t res = 0;

  41.     while (w > 1 || h > 1) {

  42.         res += w * h;

  43.         if (res + 1 >= INT32_MAX)

  44.             return -1;

  45.         w = (w + 1) >> 1;

  46.         h = (h + 1) >> 1;

  47.     }

  48.     return (int32_t)(res + 1);

  49. }

  50. 

  51. static Jpeg2000TgtNode *ff_jpeg2000_tag_tree_init(int w, int h)

  52. {

  53.     int pw = w, ph = h;

  54.     Jpeg2000TgtNode *res, *t, *t2;

  55.     int32_t tt_size;

  56. 

  57.     tt_size = tag_tree_size(w, h);

  58.     if (tt_size == -1)

  59.         return NULL;

  60. 

  61.     t = res = av_mallocz_array(tt_size, sizeof(*t));

  62.     if (!res)

  63.         return NULL;

  64. 

  65.     while (w > 1 || h > 1) {

  66.         int i, j;

  67.         pw = w;

  68.         ph = h;

  69. 

  70.         w  = (w + 1) >> 1;

  71.         h  = (h + 1) >> 1;

  72.         t2 = t + pw * ph;

  73. 

  74.         for (i = 0; i < ph; i++)

  75.             for (j = 0; j < pw; j++)

  76.                 t[i * pw + j].parent = &t2[(i >> 1) * w + (j >> 1)];

  77. 

  78.         t = t2;

  79.     }

  80.     t[0].parent = NULL;

  81.     return res;

  82. }

  83. 

  84. uint8_t ff_jpeg2000_sigctxno_lut[256][4];

  85. 

  86. static int getsigctxno(int flag, int bandno)

  87. {

  88.     int h, v, d;

  89. 

  90.     h = ((flag & JPEG2000_T1_SIG_E)  ? 1 : 0) +

  91.         ((flag & JPEG2000_T1_SIG_W)  ? 1 : 0);

  92.     v = ((flag & JPEG2000_T1_SIG_N)  ? 1 : 0) +

  93.         ((flag & JPEG2000_T1_SIG_S)  ? 1 : 0);

  94.     d = ((flag & JPEG2000_T1_SIG_NE) ? 1 : 0) +

  95.         ((flag & JPEG2000_T1_SIG_NW) ? 1 : 0) +

  96.         ((flag & JPEG2000_T1_SIG_SE) ? 1 : 0) +

  97.         ((flag & JPEG2000_T1_SIG_SW) ? 1 : 0);

  98. 

  99.     if (bandno < 3) {

  100.         if (bandno == 1)

  101.             FFSWAP(int, h, v);

  102.         if (h == 2) return 8;

  103.         if (h == 1) {

  104.             if (v >= 1) return 7;

  105.             if (d >= 1) return 6;

  106.             return 5;

  107.         }

  108.         if (v == 2) return 4;

  109.         if (v == 1) return 3;

  110.         if (d >= 2) return 2;

  111.         if (d == 1) return 1;

  112.     } else {

  113.         if (d >= 3) return 8;

  114.         if (d == 2) {

  115.             if (h+v >= 1) return 7;

  116.             return 6;

  117.         }

  118.         if (d == 1) {

  119.             if (h+v >= 2) return 5;

  120.             if (h+v == 1) return 4;

  121.             return 3;

  122.         }

  123.         if (h+v >= 2) return 2;

  124.         if (h+v == 1) return 1;

  125.     }

  126.     return 0;

  127. }

  128. 

  129. uint8_t ff_jpeg2000_sgnctxno_lut[16][16], ff_jpeg2000_xorbit_lut[16][16];

  130. 

  131. static const int contribtab[3][3] = { {  0, -1,  1 }, { -1, -1,  0 }, {  1,  0,  1 } };

  132. static const int  ctxlbltab[3][3] = { { 13, 12, 11 }, { 10,  9, 10 }, { 11, 12, 13 } };

  133. static const int  xorbittab[3][3] = { {  1,  1,  1 }, {  1,  0,  0 }, {  0,  0,  0 } };

  134. 

  135. static int getsgnctxno(int flag, uint8_t *xorbit)

  136. {

  137.     int vcontrib, hcontrib;

  138. 

  139.     hcontrib = contribtab[flag & JPEG2000_T1_SIG_E ? flag & JPEG2000_T1_SGN_E ? 1 : 2 : 0]

  140.                          [flag & JPEG2000_T1_SIG_W ? flag & JPEG2000_T1_SGN_W ? 1 : 2 : 0] + 1;

  141.     vcontrib = contribtab[flag & JPEG2000_T1_SIG_S ? flag & JPEG2000_T1_SGN_S ? 1 : 2 : 0]

  142.                          [flag & JPEG2000_T1_SIG_N ? flag & JPEG2000_T1_SGN_N ? 1 : 2 : 0] + 1;

  143.     *xorbit = xorbittab[hcontrib][vcontrib];

  144. 

  145.     return ctxlbltab[hcontrib][vcontrib];

  146. }

  147. 

  148. void ff_jpeg2000_init_tier1_luts(void)

  149. {

  150.     int i, j;

  151.     for (i = 0; i < 256; i++)

  152.         for (j = 0; j < 4; j++)

  153.             ff_jpeg2000_sigctxno_lut[i][j] = getsigctxno(i, j);

  154.     for (i = 0; i < 16; i++)

  155.         for (j = 0; j < 16; j++)

  156.             ff_jpeg2000_sgnctxno_lut[i][j] =

  157.                 getsgnctxno(i + (j << 8), &ff_jpeg2000_xorbit_lut[i][j]);

  158. }

  159. 

  160. void ff_jpeg2000_set_significance(Jpeg2000T1Context *t1, int x, int y,

  161.                                   int negative)

  162. {

  163.     x++;

  164.     y++;

  165.     t1->flags[y][x] |= JPEG2000_T1_SIG;

  166.     if (negative) {

  167.         t1->flags[y][x + 1] |= JPEG2000_T1_SIG_W | JPEG2000_T1_SGN_W;

  168.         t1->flags[y][x - 1] |= JPEG2000_T1_SIG_E | JPEG2000_T1_SGN_E;

  169.         t1->flags[y + 1][x] |= JPEG2000_T1_SIG_N | JPEG2000_T1_SGN_N;

  170.         t1->flags[y - 1][x] |= JPEG2000_T1_SIG_S | JPEG2000_T1_SGN_S;

  171.     } else {

  172.         t1->flags[y][x + 1] |= JPEG2000_T1_SIG_W;

  173.         t1->flags[y][x - 1] |= JPEG2000_T1_SIG_E;

  174.         t1->flags[y + 1][x] |= JPEG2000_T1_SIG_N;

  175.         t1->flags[y - 1][x] |= JPEG2000_T1_SIG_S;

  176.     }

  177.     t1->flags[y + 1][x + 1] |= JPEG2000_T1_SIG_NW;

  178.     t1->flags[y + 1][x - 1] |= JPEG2000_T1_SIG_NE;

  179.     t1->flags[y - 1][x + 1] |= JPEG2000_T1_SIG_SW;

  180.     t1->flags[y - 1][x - 1] |= JPEG2000_T1_SIG_SE;

  181. }

  182. 

  183. static const uint8_t lut_gain[2][4] = { { 0, 0, 0, 0 }, { 0, 1, 1, 2 } };

  184. 

  185. int ff_jpeg2000_init_component(Jpeg2000Component *comp,

  186.                                Jpeg2000CodingStyle *codsty,

  187.                                Jpeg2000QuantStyle *qntsty,

  188.                                int cbps, int dx, int dy,

  189.                                AVCodecContext *avctx)

  190. {

  191.     uint8_t log2_band_prec_width, log2_band_prec_height;

  192.     int reslevelno, bandno, gbandno = 0, ret, i, j;

  193.     uint32_t csize = 1;

  194. 

  195.     if (ret = ff_jpeg2000_dwt_init(&comp->dwt, comp->coord,

  196.                                    codsty->nreslevels2decode - 1,

  197.                                    codsty->transform))

  198.         return ret;

  199.     // component size comp->coord is uint16_t so ir cannot overflow

  200.     csize = (comp->coord[0][1] - comp->coord[0][0]) *

  201.             (comp->coord[1][1] - comp->coord[1][0]);

  202. 

  203.     if (codsty->transform == FF_DWT97) {

  204.         comp->i_data = NULL;

  205.         comp->f_data = av_malloc_array(csize, sizeof(*comp->f_data));

  206.         if (!comp->f_data)

  207.             return AVERROR(ENOMEM);

  208.     } else {

  209.         comp->f_data = NULL;

  210.         comp->i_data = av_malloc_array(csize, sizeof(*comp->i_data));

  211.         if (!comp->i_data)

  212.             return AVERROR(ENOMEM);

  213.     }

  214.     comp->reslevel = av_malloc_array(codsty->nreslevels, sizeof(*comp->reslevel));

  215.     if (!comp->reslevel)

  216.         return AVERROR(ENOMEM);

  217.     /* LOOP on resolution levels */

  218.     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {

  219.         int declvl = codsty->nreslevels - reslevelno;    // N_L -r see  ISO/IEC 15444-1:2002 B.5

  220.         Jpeg2000ResLevel *reslevel = comp->reslevel + reslevelno;

  221. 

  222.         /* Compute borders for each resolution level.

  223.          * Computation of trx_0, trx_1, try_0 and try_1.

  224.          * see ISO/IEC 15444-1:2002 eq. B.5 and B-14 */

  225.         for (i = 0; i < 2; i++)

  226.             for (j = 0; j < 2; j++)

  227.                 reslevel->coord[i][j] =

  228.                     ff_jpeg2000_ceildivpow2(comp->coord_o[i][j], declvl - 1);

  229.         // update precincts size: 2^n value

  230.         reslevel->log2_prec_width  = codsty->log2_prec_widths[reslevelno];

  231.         reslevel->log2_prec_height = codsty->log2_prec_heights[reslevelno];

  232. 

  233.         /* Number of bands for each resolution level */

  234.         if (reslevelno == 0)

  235.             reslevel->nbands = 1;

  236.         else

  237.             reslevel->nbands = 3;

  238. 

  239.         /* Number of precincts wich span the tile for resolution level reslevelno

  240.          * see B.6 in ISO/IEC 15444-1:2002 eq. B-16

  241.          * num_precincts_x = |- trx_1 / 2 ^ log2_prec_width) -| - (trx_0 / 2 ^ log2_prec_width)

  242.          * num_precincts_y = |- try_1 / 2 ^ log2_prec_width) -| - (try_0 / 2 ^ log2_prec_width)

  243.          * for Dcinema profiles in JPEG 2000

  244.          * num_precincts_x = |- trx_1 / 2 ^ log2_prec_width) -|

  245.          * num_precincts_y = |- try_1 / 2 ^ log2_prec_width) -| */

  246.         if (reslevel->coord[0][1] == reslevel->coord[0][0])

  247.             reslevel->num_precincts_x = 0;

  248.         else

  249.             reslevel->num_precincts_x =

  250.                 ff_jpeg2000_ceildivpow2(reslevel->coord[0][1],

  251.                                         reslevel->log2_prec_width) -

  252.                 (reslevel->coord[0][0] >> reslevel->log2_prec_width);

  253. 

  254.         if (reslevel->coord[1][1] == reslevel->coord[1][0])

  255.             reslevel->num_precincts_y = 0;

  256.         else

  257.             reslevel->num_precincts_y =

  258.                 ff_jpeg2000_ceildivpow2(reslevel->coord[1][1],

  259.                                         reslevel->log2_prec_height) -

  260.                 (reslevel->coord[1][0] >> reslevel->log2_prec_height);

  261. 

  262.         reslevel->band = av_malloc_array(reslevel->nbands, sizeof(*reslevel->band));

  263.         if (!reslevel->band)

  264.             return AVERROR(ENOMEM);

  265. 

  266.         for (bandno = 0; bandno < reslevel->nbands; bandno++, gbandno++) {

  267.             Jpeg2000Band *band = reslevel->band + bandno;

  268.             int cblkno, precno;

  269.             int nb_precincts;

  270. 

  271.             /* TODO: Implementation of quantization step not finished,

  272.              * see ISO/IEC 15444-1:2002 E.1 and A.6.4. */

  273.             switch (qntsty->quantsty) {

  274.                 uint8_t gain;

  275.                 int numbps;

  276.             case JPEG2000_QSTY_NONE:

  277.                 /* TODO: to verify. No quantization in this case */

  278.                 band->f_stepsize = (float) (1 << 13);

  279.                 break;

  280.             case JPEG2000_QSTY_SI:

  281.                 /*TODO: Compute formula to implement. */

  282.                 numbps = cbps +

  283.                          lut_gain[codsty->transform][bandno + (reslevelno > 0)];

  284.                 band->f_stepsize = (float)SHL(2048 + qntsty->mant[gbandno],

  285.                                             2 + numbps - qntsty->expn[gbandno]);

  286.                 break;

  287.             case JPEG2000_QSTY_SE:

  288.                 /* Exponent quantization step.

  289.                  * Formula:

  290.                  * delta_b = 2 ^ (R_b - expn_b) * (1 + (mant_b / 2 ^ 11))

  291.                  * R_b = R_I + log2 (gain_b )

  292.                  * see ISO/IEC 15444-1:2002 E.1.1 eqn. E-3 and E-4 */

  293.                 /* TODO/WARN: value of log2 (gain_b ) not taken into account

  294.                  * but it works (compared to OpenJPEG). Why?

  295.                  * Further investigation needed. */

  296.                 gain            = cbps;

  297.                 band->f_stepsize  = pow(2.0, gain - qntsty->expn[gbandno]);

  298.                 band->f_stepsize *= (float)qntsty->mant[gbandno] / 2048.0 + 1.0;

  299.                 break;

  300.             default:

  301.                 band->f_stepsize = 0;

  302.                 av_log(avctx, AV_LOG_ERROR, "Unknown quantization format\n");

  303.                 break;

  304.             }

  305.             /* FIXME: In openjepg code stespize = stepsize * 0.5. Why?

  306.                 * If not set output of entropic decoder is not correct. */

  307.             if (!av_codec_is_encoder(avctx->codec))

  308.                 band->f_stepsize *= 0.5;

  309. 

  310.             band->i_stepsize = (int32_t)(band->f_stepsize * (1 << 16));

  311. 

  312.             /* computation of tbx_0, tbx_1, tby_0, tby_1

  313.              * see ISO/IEC 15444-1:2002 B.5 eq. B-15 and tbl B.1

  314.              * codeblock width and height is computed for

  315.              * DCI JPEG 2000 codeblock_width = codeblock_width = 32 = 2 ^ 5 */

  316.             if (reslevelno == 0) {

  317.                 /* for reslevelno = 0, only one band, x0_b = y0_b = 0 */

  318.                 for (i = 0; i < 2; i++)

  319.                     for (j = 0; j < 2; j++)

  320.                         band->coord[i][j] =

  321.                             ff_jpeg2000_ceildivpow2(comp->coord_o[i][j],

  322.                                                     declvl - 1);

  323. 

  324.                 log2_band_prec_width  = reslevel->log2_prec_width;

  325.                 log2_band_prec_height = reslevel->log2_prec_height;

  326.                 /* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */

  327.                 band->log2_cblk_width  = FFMIN(codsty->log2_cblk_width,

  328.                                                reslevel->log2_prec_width);

  329.                 band->log2_cblk_height = FFMIN(codsty->log2_cblk_height,

  330.                                                reslevel->log2_prec_height);

  331.             } else {

  332.                 /* 3 bands x0_b = 1 y0_b = 0; x0_b = 0 y0_b = 1; x0_b = y0_b = 1 */

  333.                 /* x0_b and y0_b are computed with ((bandno + 1 >> i) & 1) */

  334.                 for (i = 0; i < 2; i++)

  335.                     for (j = 0; j < 2; j++)

  336.                         /* Formula example for tbx_0 = ceildiv((tcx_0 - 2 ^ (declvl - 1) * x0_b) / declvl) */

  337.                         band->coord[i][j] =

  338.                             ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] -

  339.                                                     (((bandno + 1 >> i) & 1) << declvl - 1),

  340.                                                     declvl);

  341.                 /* TODO: Manage case of 3 band offsets here or

  342.                  * in coding/decoding function? */

  343. 

  344.                 /* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */

  345.                 band->log2_cblk_width  = FFMIN(codsty->log2_cblk_width,

  346.                                                reslevel->log2_prec_width - 1);

  347.                 band->log2_cblk_height = FFMIN(codsty->log2_cblk_height,

  348.                                                reslevel->log2_prec_height - 1);

  349. 

  350.                 log2_band_prec_width  = reslevel->log2_prec_width  - 1;

  351.                 log2_band_prec_height = reslevel->log2_prec_height - 1;

  352.             }

  353. 

  354.             band->prec = av_malloc_array(reslevel->num_precincts_x *

  355.                                          reslevel->num_precincts_y,

  356.                                          sizeof(*band->prec));

  357.             if (!band->prec)

  358.                 return AVERROR(ENOMEM);

  359. 

  360.             nb_precincts = reslevel->num_precincts_x * reslevel->num_precincts_y;

  361. 

  362.             for (precno = 0; precno < nb_precincts; precno++) {

  363.                 Jpeg2000Prec *prec = band->prec + precno;

  364. 

  365.                 /* TODO: Explain formula for JPEG200 DCINEMA. */

  366.                 /* TODO: Verify with previous count of codeblocks per band */

  367. 

  368.                 /* Compute P_x0 */

  369.                 prec->coord[0][0] = (precno % reslevel->num_precincts_x) *

  370.                                     (1 << log2_band_prec_width);

  371.                 prec->coord[0][0] = FFMAX(prec->coord[0][0], band->coord[0][0]);

  372. 

  373.                 /* Compute P_y0 */

  374.                 prec->coord[1][0] = (precno / reslevel->num_precincts_x) *

  375.                                     (1 << log2_band_prec_height);

  376.                 prec->coord[1][0] = FFMAX(prec->coord[1][0], band->coord[1][0]);

  377. 

  378.                 /* Compute P_x1 */

  379.                 prec->coord[0][1] = prec->coord[0][0] +

  380.                                     (1 << log2_band_prec_width);

  381.                 prec->coord[0][1] = FFMIN(prec->coord[0][1], band->coord[0][1]);

  382. 

  383.                 /* Compute P_y1 */

  384.                 prec->coord[1][1] = prec->coord[1][0] +

  385.                                     (1 << log2_band_prec_height);

  386.                 prec->coord[1][1] = FFMIN(prec->coord[1][1], band->coord[1][1]);

  387. 

  388.                 prec->nb_codeblocks_width =

  389.                     ff_jpeg2000_ceildivpow2(prec->coord[0][1] -

  390.                                             prec->coord[0][0],

  391.                                             band->log2_cblk_width);

  392.                 prec->nb_codeblocks_height =

  393.                     ff_jpeg2000_ceildivpow2(prec->coord[1][1] -

  394.                                             prec->coord[1][0],

  395.                                             band->log2_cblk_height);

  396. 

  397.                 /* Tag trees initialization */

  398.                 prec->cblkincl =

  399.                     ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,

  400.                                               prec->nb_codeblocks_height);

  401.                 if (!prec->cblkincl)

  402.                     return AVERROR(ENOMEM);

  403. 

  404.                 prec->zerobits =

  405.                     ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,

  406.                                               prec->nb_codeblocks_height);

  407.                 if (!prec->zerobits)

  408.                     return AVERROR(ENOMEM);

  409. 

  410.                 prec->cblk = av_malloc_array(prec->nb_codeblocks_width *

  411.                                              prec->nb_codeblocks_height,

  412.                                              sizeof(*prec->cblk));

  413.                 if (!prec->cblk)

  414.                     return AVERROR(ENOMEM);

  415.                 for (cblkno = 0; cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height; cblkno++) {

  416.                     Jpeg2000Cblk *cblk = prec->cblk + cblkno;

  417.                     uint16_t Cx0, Cy0;

  418. 

  419.                     /* Compute coordinates of codeblocks */

  420.                     /* Compute Cx0*/

  421.                     Cx0 = (prec->coord[0][0] >> band->log2_cblk_width) << band->log2_cblk_width;

  422.                     Cx0 = Cx0 + ((cblkno % prec->nb_codeblocks_width)  << band->log2_cblk_width);

  423.                     cblk->coord[0][0] = FFMAX(Cx0, prec->coord[0][0]);

  424. 

  425.                     /* Compute Cy0*/

  426.                     Cy0 = (prec->coord[1][0] >> band->log2_cblk_height) << band->log2_cblk_height;

  427.                     Cy0 = Cy0 + ((cblkno / prec->nb_codeblocks_width)   << band->log2_cblk_height);

  428.                     cblk->coord[1][0] = FFMAX(Cy0, prec->coord[1][0]);

  429. 

  430.                     /* Compute Cx1 */

  431.                     cblk->coord[0][1] = FFMIN(Cx0 + (1 << band->log2_cblk_width),

  432.                                               prec->coord[0][1]);

  433. 

  434.                     /* Compute Cy1 */

  435.                     cblk->coord[1][1] = FFMIN(Cy0 + (1 << band->log2_cblk_height),

  436.                                               prec->coord[1][1]);

  437. 

  438.                     if((bandno + !!reslevelno) & 1) {

  439.                         cblk->coord[0][0] += comp->reslevel[reslevelno-1].coord[0][1] - comp->reslevel[reslevelno-1].coord[0][0];

  440.                         cblk->coord[0][1] += comp->reslevel[reslevelno-1].coord[0][1] - comp->reslevel[reslevelno-1].coord[0][0];

  441.                     }

  442.                     if((bandno + !!reslevelno) & 2) {

  443.                         cblk->coord[1][0] += comp->reslevel[reslevelno-1].coord[1][1] - comp->reslevel[reslevelno-1].coord[1][0];

  444.                         cblk->coord[1][1] += comp->reslevel[reslevelno-1].coord[1][1] - comp->reslevel[reslevelno-1].coord[1][0];

  445.                     }

  446. 

  447.                     cblk->zero      = 0;

  448.                     cblk->lblock    = 3;

  449.                     cblk->length    = 0;

  450.                     cblk->lengthinc = 0;

  451.                     cblk->npasses   = 0;

  452.                 }

  453.             }

  454.         }

  455.     }

  456.     return 0;

  457. }

  458. 

  459. void ff_jpeg2000_cleanup(Jpeg2000Component *comp, Jpeg2000CodingStyle *codsty)

  460. {

  461.     int reslevelno, bandno, precno;

  462.     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {

  463.         Jpeg2000ResLevel *reslevel = comp->reslevel + reslevelno;

  464. 

  465.         for (bandno = 0; bandno < reslevel->nbands; bandno++) {

  466.             Jpeg2000Band *band = reslevel->band + bandno;

  467.             for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++) {

  468.                 Jpeg2000Prec *prec = band->prec + precno;

  469.                 av_freep(&prec->zerobits);

  470.                 av_freep(&prec->cblkincl);

  471.                 av_freep(&prec->cblk);

  472.             }

  473. 

  474.             av_freep(&band->prec);

  475.         }

  476.         av_freep(&reslevel->band);

  477.     }

  478. 

  479.     ff_dwt_destroy(&comp->dwt);

  480.     av_freep(&comp->reslevel);

  481.     av_freep(&comp->i_data);

  482.     av_freep(&comp->f_data);

  483. }