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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/attributes.h"

  29. #include "libavutil/avassert.h"

  30. #include "libavutil/common.h"

  31. #include "libavutil/imgutils.h"

  32. #include "libavutil/mem.h"

  33. #include "avcodec.h"

  34. #include "jpeg2000.h"

  35. 

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

  37. 

  38. /* tag tree routines */

  39. 

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

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

  42. {

  43.     uint32_t res = 0;

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

  45.         res += w * h;

  46.         av_assert0(res + 1 < INT32_MAX);

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

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

  49.     }

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

  51. }

  52. 

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

  54. {

  55.     int pw = w, ph = h;

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

  57.     int32_t tt_size;

  58. 

  59.     tt_size = tag_tree_size(w, h);

  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. static void tag_tree_zero(Jpeg2000TgtNode *t, int w, int h)

  85. {

  86.     int i, siz = tag_tree_size(w, h);

  87. 

  88.     for (i = 0; i < siz; i++) {

  89.         t[i].val = 0;

  90.         t[i].vis = 0;

  91.     }

  92. }

  93. 

  94. uint8_t ff_jpeg2000_sigctxno_lut[256][4];

  95. 

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

  97. {

  98.     int h, v, d;

  99. 

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

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

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

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

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

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

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

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

  108. 

  109.     if (bandno < 3) {

  110.         if (bandno == 1)

  111.             FFSWAP(int, h, v);

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

  113.         if (h == 1) {

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

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

  116.             return 5;

  117.         }

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

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

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

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

  122.     } else {

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

  124.         if (d == 2) {

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

  126.             return 6;

  127.         }

  128.         if (d == 1) {

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

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

  131.             return 3;

  132.         }

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

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

  135.     }

  136.     return 0;

  137. }

  138. 

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

  140. 

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

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

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

  144. 

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

  146. {

  147.     int vcontrib, hcontrib;

  148. 

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

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

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

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

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

  154. 

  155.     return ctxlbltab[hcontrib][vcontrib];

  156. }

  157. 

  158. void av_cold ff_jpeg2000_init_tier1_luts(void)

  159. {

  160.     int i, j;

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

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

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

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

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

  166.             ff_jpeg2000_sgnctxno_lut[i][j] =

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

  168. }

  169. 

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

  171.                                   int negative)

  172. {

  173.     x++;

  174.     y++;

  175.     t1->flags[(y) * t1->stride + x] |= JPEG2000_T1_SIG;

  176.     if (negative) {

  177.         t1->flags[(y) * t1->stride + x + 1] |= JPEG2000_T1_SIG_W | JPEG2000_T1_SGN_W;

  178.         t1->flags[(y) * t1->stride + x - 1] |= JPEG2000_T1_SIG_E | JPEG2000_T1_SGN_E;

  179.         t1->flags[(y + 1) * t1->stride + x] |= JPEG2000_T1_SIG_N | JPEG2000_T1_SGN_N;

  180.         t1->flags[(y - 1) * t1->stride + x] |= JPEG2000_T1_SIG_S | JPEG2000_T1_SGN_S;

  181.     } else {

  182.         t1->flags[(y) * t1->stride + x + 1] |= JPEG2000_T1_SIG_W;

  183.         t1->flags[(y) * t1->stride + x - 1] |= JPEG2000_T1_SIG_E;

  184.         t1->flags[(y + 1) * t1->stride + x] |= JPEG2000_T1_SIG_N;

  185.         t1->flags[(y - 1) * t1->stride + x] |= JPEG2000_T1_SIG_S;

  186.     }

  187.     t1->flags[(y + 1) * t1->stride + x + 1] |= JPEG2000_T1_SIG_NW;

  188.     t1->flags[(y + 1) * t1->stride + x - 1] |= JPEG2000_T1_SIG_NE;

  189.     t1->flags[(y - 1) * t1->stride + x + 1] |= JPEG2000_T1_SIG_SW;

  190.     t1->flags[(y - 1) * t1->stride + x - 1] |= JPEG2000_T1_SIG_SE;

  191. }

  192. 

  193. // static const uint8_t lut_gain[2][4] = { { 0, 0, 0, 0 }, { 0, 1, 1, 2 } }; (unused)

  194. 

  195. int ff_jpeg2000_init_component(Jpeg2000Component *comp,

  196.                                Jpeg2000CodingStyle *codsty,

  197.                                Jpeg2000QuantStyle *qntsty,

  198.                                int cbps, int dx, int dy,

  199.                                AVCodecContext *avctx)

  200. {

  201.     uint8_t log2_band_prec_width, log2_band_prec_height;

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

  203.     uint32_t csize;

  204. 

  205.     if (codsty->nreslevels2decode <= 0) {

  206.         av_log(avctx, AV_LOG_ERROR, "nreslevels2decode %d invalid or uninitialized\n", codsty->nreslevels2decode);

  207.         return AVERROR_INVALIDDATA;

  208.     }

  209. 

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

  211.                                    codsty->nreslevels2decode - 1,

  212.                                    codsty->transform))

  213.         return ret;

  214. 

  215.     if (av_image_check_size(comp->coord[0][1] - comp->coord[0][0],

  216.                             comp->coord[1][1] - comp->coord[1][0], 0, avctx))

  217.         return AVERROR_INVALIDDATA;

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

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

  220.     if (comp->coord[0][1] - comp->coord[0][0] > 32768 ||

  221.         comp->coord[1][1] - comp->coord[1][0] > 32768) {

  222.         av_log(avctx, AV_LOG_ERROR, "component size too large\n");

  223.         return AVERROR_PATCHWELCOME;

  224.     }

  225. 

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

  227.         csize += AV_INPUT_BUFFER_PADDING_SIZE / sizeof(*comp->f_data);

  228.         comp->i_data = NULL;

  229.         comp->f_data = av_mallocz_array(csize, sizeof(*comp->f_data));

  230.         if (!comp->f_data)

  231.             return AVERROR(ENOMEM);

  232.     } else {

  233.         csize += AV_INPUT_BUFFER_PADDING_SIZE / sizeof(*comp->i_data);

  234.         comp->f_data = NULL;

  235.         comp->i_data = av_mallocz_array(csize, sizeof(*comp->i_data));

  236.         if (!comp->i_data)

  237.             return AVERROR(ENOMEM);

  238.     }

  239.     comp->reslevel = av_mallocz_array(codsty->nreslevels, sizeof(*comp->reslevel));

  240.     if (!comp->reslevel)

  241.         return AVERROR(ENOMEM);

  242.     /* LOOP on resolution levels */

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

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

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

  246. 

  247.         /* Compute borders for each resolution level.

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

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

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

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

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

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

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

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

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

  257.         if (!reslevel->log2_prec_width || !reslevel->log2_prec_height) {

  258.             return AVERROR_INVALIDDATA;

  259.         }

  260. 

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

  262.         if (reslevelno == 0)

  263.             reslevel->nbands = 1;

  264.         else

  265.             reslevel->nbands = 3;

  266. 

  267.         /* Number of precincts which span the tile for resolution level reslevelno

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

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

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

  271.          * for Dcinema profiles in JPEG 2000

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

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

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

  275.             reslevel->num_precincts_x = 0;

  276.         else

  277.             reslevel->num_precincts_x =

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

  279.                                         reslevel->log2_prec_width) -

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

  281. 

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

  283.             reslevel->num_precincts_y = 0;

  284.         else

  285.             reslevel->num_precincts_y =

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

  287.                                         reslevel->log2_prec_height) -

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

  289. 

  290.         reslevel->band = av_mallocz_array(reslevel->nbands, sizeof(*reslevel->band));

  291.         if (!reslevel->band)

  292.             return AVERROR(ENOMEM);

  293. 

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

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

  296.             int cblkno, precno;

  297.             int nb_precincts;

  298. 

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

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

  301.             switch (qntsty->quantsty) {

  302.                 uint8_t gain;

  303.             case JPEG2000_QSTY_NONE:

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

  305.                 band->f_stepsize = 1;

  306.                 break;

  307.             case JPEG2000_QSTY_SI:

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

  309. //                 numbps = cbps +

  310. //                          lut_gain[codsty->transform == FF_DWT53][bandno + (reslevelno > 0)];

  311. //                 band->f_stepsize = SHL(2048 + qntsty->mant[gbandno],

  312. //                                        2 + numbps - qntsty->expn[gbandno]);

  313. //                 break;

  314.             case JPEG2000_QSTY_SE:

  315.                 /* Exponent quantization step.

  316.                  * Formula:

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

  318.                  * R_b = R_I + log2 (gain_b )

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

  320.                 gain            = cbps;

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

  322.                 band->f_stepsize *= qntsty->mant[gbandno] / 2048.0 + 1.0;

  323.                 break;

  324.             default:

  325.                 band->f_stepsize = 0;

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

  327.                 break;

  328.             }

  329.             if (codsty->transform != FF_DWT53) {

  330.                 int lband = 0;

  331.                 switch (bandno + (reslevelno > 0)) {

  332.                     case 1:

  333.                     case 2:

  334.                         band->f_stepsize *= F_LFTG_X * 2;

  335.                         lband = 1;

  336.                         break;

  337.                     case 3:

  338.                         band->f_stepsize *= F_LFTG_X * F_LFTG_X * 4;

  339.                         break;

  340.                 }

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

  342.                     band->f_stepsize *= pow(F_LFTG_K, 2*(codsty->nreslevels2decode - reslevelno) + lband - 2);

  343.                 }

  344.             }

  345. 

  346.             band->i_stepsize = band->f_stepsize * (1 << 15);

  347. 

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

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

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

  351.                 band->f_stepsize *= 0.5;

  352. 

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

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

  355.              * codeblock width and height is computed for

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

  357.             if (reslevelno == 0) {

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

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

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

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

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

  363.                                                     declvl - 1);

  364.                 log2_band_prec_width  = reslevel->log2_prec_width;

  365.                 log2_band_prec_height = reslevel->log2_prec_height;

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

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

  368.                                                reslevel->log2_prec_width);

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

  370.                                                reslevel->log2_prec_height);

  371.             } else {

  372.                 /* 3 bands x0_b = 1 y0_b = 0; x0_b = 0 y0_b = 1; x0_b = y0_b = 1 */

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

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

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

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

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

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

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

  380.                                                     declvl);

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

  382.                  * in coding/decoding function? */

  383. 

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

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

  386.                                                reslevel->log2_prec_width - 1);

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

  388.                                                reslevel->log2_prec_height - 1);

  389. 

  390.                 log2_band_prec_width  = reslevel->log2_prec_width  - 1;

  391.                 log2_band_prec_height = reslevel->log2_prec_height - 1;

  392.             }

  393. 

  394.             if (reslevel->num_precincts_x * (uint64_t)reslevel->num_precincts_y > INT_MAX) {

  395.                 band->prec = NULL;

  396.                 return AVERROR(ENOMEM);

  397.             }

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

  399.             band->prec = av_mallocz_array(nb_precincts, sizeof(*band->prec));

  400.             if (!band->prec)

  401.                 return AVERROR(ENOMEM);

  402. 

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

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

  405.                 int nb_codeblocks;

  406. 

  407.                 prec->decoded_layers = 0;

  408. 

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

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

  411. 

  412.                 /* Compute P_x0 */

  413.                 prec->coord[0][0] = ((band->coord[0][0] >> log2_band_prec_width) + precno % reslevel->num_precincts_x) *

  414.                                     (1 << log2_band_prec_width);

  415. 

  416.                 /* Compute P_y0 */

  417.                 prec->coord[1][0] = ((band->coord[1][0] >> log2_band_prec_height) + precno / reslevel->num_precincts_x) *

  418.                                     (1 << log2_band_prec_height);

  419. 

  420.                 /* Compute P_x1 */

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

  422.                                     (1 << log2_band_prec_width);

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

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

  425. 

  426.                 /* Compute P_y1 */

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

  428.                                     (1 << log2_band_prec_height);

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

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

  431. 

  432.                 prec->nb_codeblocks_width =

  433.                     ff_jpeg2000_ceildivpow2(prec->coord[0][1],

  434.                                             band->log2_cblk_width)

  435.                     - (prec->coord[0][0] >> band->log2_cblk_width);

  436.                 prec->nb_codeblocks_height =

  437.                     ff_jpeg2000_ceildivpow2(prec->coord[1][1],

  438.                                             band->log2_cblk_height)

  439.                     - (prec->coord[1][0] >> band->log2_cblk_height);

  440. 

  441. 

  442.                 /* Tag trees initialization */

  443.                 prec->cblkincl =

  444.                     ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,

  445.                                               prec->nb_codeblocks_height);

  446.                 if (!prec->cblkincl)

  447.                     return AVERROR(ENOMEM);

  448. 

  449.                 prec->zerobits =

  450.                     ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,

  451.                                               prec->nb_codeblocks_height);

  452.                 if (!prec->zerobits)

  453.                     return AVERROR(ENOMEM);

  454. 

  455.                 if (prec->nb_codeblocks_width * (uint64_t)prec->nb_codeblocks_height > INT_MAX) {

  456.                     prec->cblk = NULL;

  457.                     return AVERROR(ENOMEM);

  458.                 }

  459.                 nb_codeblocks = prec->nb_codeblocks_width * prec->nb_codeblocks_height;

  460.                 prec->cblk = av_mallocz_array(nb_codeblocks, sizeof(*prec->cblk));

  461.                 if (!prec->cblk)

  462.                     return AVERROR(ENOMEM);

  463.                 for (cblkno = 0; cblkno < nb_codeblocks; cblkno++) {

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

  465.                     int Cx0, Cy0;

  466. 

  467.                     /* Compute coordinates of codeblocks */

  468.                     /* Compute Cx0*/

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

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

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

  472. 

  473.                     /* Compute Cy0*/

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

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

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

  477. 

  478.                     /* Compute Cx1 */

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

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

  481. 

  482.                     /* Compute Cy1 */

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

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

  485.                     /* Update code-blocks coordinates according sub-band position */

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

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

  488.                                              comp->reslevel[reslevelno-1].coord[0][0];

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

  490.                                              comp->reslevel[reslevelno-1].coord[0][0];

  491.                     }

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

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

  494.                                              comp->reslevel[reslevelno-1].coord[1][0];

  495.                         cblk->coord[1][1] += comp->reslevel[reslevelno-1].coord[1][1] -

  496.                                              comp->reslevel[reslevelno-1].coord[1][0];

  497.                     }

  498. 

  499.                     cblk->zero      = 0;

  500.                     cblk->lblock    = 3;

  501.                     cblk->length    = 0;

  502.                     memset(cblk->lengthinc, 0, sizeof(cblk->lengthinc));

  503.                     cblk->npasses   = 0;

  504.                 }

  505.             }

  506.         }

  507.     }

  508.     return 0;

  509. }

  510. 

  511. void ff_jpeg2000_reinit(Jpeg2000Component *comp, Jpeg2000CodingStyle *codsty)

  512. {

  513.     int reslevelno, bandno, cblkno, precno;

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

  515.         Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;

  516.         for (bandno = 0; bandno < rlevel->nbands; bandno++) {

  517.             Jpeg2000Band *band = rlevel->band + bandno;

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

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

  520.                 tag_tree_zero(prec->zerobits, prec->nb_codeblocks_width, prec->nb_codeblocks_height);

  521.                 tag_tree_zero(prec->cblkincl, prec->nb_codeblocks_width, prec->nb_codeblocks_height);

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

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

  524.                     cblk->length = 0;

  525.                     cblk->lblock = 3;

  526.                 }

  527.             }

  528.         }

  529.     }

  530. }

  531. 

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

  533. {

  534.     int reslevelno, bandno, precno;

  535.     for (reslevelno = 0;

  536.          comp->reslevel && reslevelno < codsty->nreslevels;

  537.          reslevelno++) {

  538.         Jpeg2000ResLevel *reslevel;

  539. 

  540.         if (!comp->reslevel)

  541.             continue;

  542. 

  543.         reslevel = comp->reslevel + reslevelno;

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

  545.             Jpeg2000Band *band;

  546. 

  547.             if (!reslevel->band)

  548.                 continue;

  549. 

  550.             band = reslevel->band + bandno;

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

  552.                 if (band->prec) {

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

  554.                     av_freep(&prec->zerobits);

  555.                     av_freep(&prec->cblkincl);

  556.                     av_freep(&prec->cblk);

  557.                 }

  558.             }

  559. 

  560.             av_freep(&band->prec);

  561.         }

  562.         av_freep(&reslevel->band);

  563.     }

  564. 

  565.     ff_dwt_destroy(&comp->dwt);

  566.     av_freep(&comp->reslevel);

  567.     av_freep(&comp->i_data);

  568.     av_freep(&comp->f_data);

  569. }