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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(int w, int h)

  42. {

  43.     int64_t res = 0;

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

  45.         res += w * (int64_t)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. static inline float exp2fi(int x) {

  196.     /* Normal range */

  197.     if (-126 <= x && x <= 128)

  198.         return av_int2float(x+127 << 23);

  199.     /* Too large */

  200.     else if (x > 128)

  201.         return INFINITY;

  202.     /* Subnormal numbers */

  203.     else if (x > -150)

  204.         return av_int2float(1 << (x+149));

  205.     /* Negligibly small */

  206.     else

  207.         return 0;

  208. }

  209. 

  210. static void init_band_stepsize(AVCodecContext *avctx,

  211.                                Jpeg2000Band *band,

  212.                                Jpeg2000CodingStyle *codsty,

  213.                                Jpeg2000QuantStyle *qntsty,

  214.                                int bandno, int gbandno, int reslevelno,

  215.                                int cbps)

  216. {

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

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

  219.     switch (qntsty->quantsty) {

  220.         uint8_t gain;

  221.     case JPEG2000_QSTY_NONE:

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

  223.         band->f_stepsize = 1;

  224.         break;

  225.     case JPEG2000_QSTY_SI:

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

  227. //         numbps = cbps +

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

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

  230. //                                2 + numbps - qntsty->expn[gbandno]);

  231. //         break;

  232.     case JPEG2000_QSTY_SE:

  233.         /* Exponent quantization step.

  234.          * Formula:

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

  236.          * R_b = R_I + log2 (gain_b )

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

  238.         gain            = cbps;

  239.         band->f_stepsize  = exp2fi(gain - qntsty->expn[gbandno]);

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

  241.         break;

  242.     default:

  243.         band->f_stepsize = 0;

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

  245.         break;

  246.     }

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

  248.         int lband = 0;

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

  250.             case 1:

  251.             case 2:

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

  253.                 lband = 1;

  254.                 break;

  255.             case 3:

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

  257.                 break;

  258.         }

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

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

  261.         }

  262.     }

  263. 

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

  265. 

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

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

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

  269.         band->f_stepsize *= 0.5;

  270. }

  271. 

  272. static int init_prec(Jpeg2000Band *band,

  273.                      Jpeg2000ResLevel *reslevel,

  274.                      Jpeg2000Component *comp,

  275.                      int precno, int bandno, int reslevelno,

  276.                      int log2_band_prec_width,

  277.                      int log2_band_prec_height)

  278. {

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

  280.     int nb_codeblocks, cblkno;

  281. 

  282.     prec->decoded_layers = 0;

  283. 

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

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

  286. 

  287.     /* Compute P_x0 */

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

  289.                         (1 << log2_band_prec_width);

  290. 

  291.     /* Compute P_y0 */

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

  293.                         (1 << log2_band_prec_height);

  294. 

  295.     /* Compute P_x1 */

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

  297.                         (1 << log2_band_prec_width);

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

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

  300. 

  301.     /* Compute P_y1 */

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

  303.                         (1 << log2_band_prec_height);

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

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

  306. 

  307.     prec->nb_codeblocks_width =

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

  309.                                 band->log2_cblk_width)

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

  311.     prec->nb_codeblocks_height =

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

  313.                                 band->log2_cblk_height)

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

  315. 

  316. 

  317.     /* Tag trees initialization */

  318.     prec->cblkincl =

  319.         ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,

  320.                                   prec->nb_codeblocks_height);

  321.     if (!prec->cblkincl)

  322.         return AVERROR(ENOMEM);

  323. 

  324.     prec->zerobits =

  325.         ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,

  326.                                   prec->nb_codeblocks_height);

  327.     if (!prec->zerobits)

  328.         return AVERROR(ENOMEM);

  329. 

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

  331.         prec->cblk = NULL;

  332.         return AVERROR(ENOMEM);

  333.     }

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

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

  336.     if (!prec->cblk)

  337.         return AVERROR(ENOMEM);

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

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

  340.         int Cx0, Cy0;

  341. 

  342.         /* Compute coordinates of codeblocks */

  343.         /* Compute Cx0*/

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

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

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

  347. 

  348.         /* Compute Cy0*/

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

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

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

  352. 

  353.         /* Compute Cx1 */

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

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

  356. 

  357.         /* Compute Cy1 */

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

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

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

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

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

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

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

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

  366.         }

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

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

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

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

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

  372.         }

  373. 

  374.         cblk->zero      = 0;

  375.         cblk->lblock    = 3;

  376.         cblk->length    = 0;

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

  378.         cblk->npasses   = 0;

  379.     }

  380. 

  381.     return 0;

  382. }

  383. 

  384. static int init_band(AVCodecContext *avctx,

  385.                      Jpeg2000ResLevel *reslevel,

  386.                      Jpeg2000Component *comp,

  387.                      Jpeg2000CodingStyle *codsty,

  388.                      Jpeg2000QuantStyle *qntsty,

  389.                      int bandno, int gbandno, int reslevelno,

  390.                      int cbps, int dx, int dy)

  391. {

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

  393.     uint8_t log2_band_prec_width, log2_band_prec_height;

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

  395.     int precno;

  396.     int nb_precincts;

  397.     int i, j, ret;

  398. 

  399.     init_band_stepsize(avctx, band, codsty, qntsty, bandno, gbandno, reslevelno, cbps);

  400. 

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

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

  403.      * codeblock width and height is computed for

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

  405.     if (reslevelno == 0) {

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

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

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

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

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

  411.                                             declvl - 1);

  412.         log2_band_prec_width  = reslevel->log2_prec_width;

  413.         log2_band_prec_height = reslevel->log2_prec_height;

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

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

  416.                                        reslevel->log2_prec_width);

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

  418.                                        reslevel->log2_prec_height);

  419.     } else {

  420.         /* 3 bands x0_b = 1 y0_b = 0; x0_b = 0 y0_b = 1; x0_b = y0_b = 1 */

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

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

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

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

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

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

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

  428.                                             declvl);

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

  430.          * in coding/decoding function? */

  431. 

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

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

  434.                                        reslevel->log2_prec_width - 1);

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

  436.                                        reslevel->log2_prec_height - 1);

  437. 

  438.         log2_band_prec_width  = reslevel->log2_prec_width  - 1;

  439.         log2_band_prec_height = reslevel->log2_prec_height - 1;

  440.     }

  441. 

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

  443.         band->prec = NULL;

  444.         return AVERROR(ENOMEM);

  445.     }

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

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

  448.     if (!band->prec)

  449.         return AVERROR(ENOMEM);

  450. 

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

  452.         ret = init_prec(band, reslevel, comp,

  453.                         precno, bandno, reslevelno,

  454.                         log2_band_prec_width, log2_band_prec_height);

  455.         if (ret < 0)

  456.             return ret;

  457.     }

  458. 

  459.     return 0;

  460. }

  461. 

  462. int ff_jpeg2000_init_component(Jpeg2000Component *comp,

  463.                                Jpeg2000CodingStyle *codsty,

  464.                                Jpeg2000QuantStyle *qntsty,

  465.                                int cbps, int dx, int dy,

  466.                                AVCodecContext *avctx)

  467. {

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

  469.     uint32_t csize;

  470. 

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

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

  473.         return AVERROR_INVALIDDATA;

  474.     }

  475. 

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

  477.                                    codsty->nreslevels2decode - 1,

  478.                                    codsty->transform))

  479.         return ret;

  480. 

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

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

  483.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  489.         return AVERROR_PATCHWELCOME;

  490.     }

  491. 

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

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

  494.         comp->i_data = NULL;

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

  496.         if (!comp->f_data)

  497.             return AVERROR(ENOMEM);

  498.     } else {

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

  500.         comp->f_data = NULL;

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

  502.         if (!comp->i_data)

  503.             return AVERROR(ENOMEM);

  504.     }

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

  506.     if (!comp->reslevel)

  507.         return AVERROR(ENOMEM);

  508.     /* LOOP on resolution levels */

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

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

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

  512. 

  513.         /* Compute borders for each resolution level.

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

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

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

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

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

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

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

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

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

  523. 

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

  525.         if (reslevelno == 0)

  526.             reslevel->nbands = 1;

  527.         else

  528.             reslevel->nbands = 3;

  529. 

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

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

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

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

  534.          * for Dcinema profiles in JPEG 2000

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

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

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

  538.             reslevel->num_precincts_x = 0;

  539.         else

  540.             reslevel->num_precincts_x =

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

  542.                                         reslevel->log2_prec_width) -

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

  544. 

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

  546.             reslevel->num_precincts_y = 0;

  547.         else

  548.             reslevel->num_precincts_y =

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

  550.                                         reslevel->log2_prec_height) -

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

  552. 

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

  554.         if (!reslevel->band)

  555.             return AVERROR(ENOMEM);

  556. 

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

  558.             ret = init_band(avctx, reslevel,

  559.                             comp, codsty, qntsty,

  560.                             bandno, gbandno, reslevelno,

  561.                             cbps, dx, dy);

  562.             if (ret < 0)

  563.                 return ret;

  564.         }

  565.     }

  566.     return 0;

  567. }

  568. 

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

  570. {

  571.     int reslevelno, bandno, cblkno, precno;

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

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

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

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

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

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

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

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

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

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

  582.                     cblk->length = 0;

  583.                     cblk->lblock = 3;

  584.                 }

  585.             }

  586.         }

  587.     }

  588. }

  589. 

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

  591. {

  592.     int reslevelno, bandno, precno;

  593.     for (reslevelno = 0;

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

  595.          reslevelno++) {

  596.         Jpeg2000ResLevel *reslevel;

  597. 

  598.         if (!comp->reslevel)

  599.             continue;

  600. 

  601.         reslevel = comp->reslevel + reslevelno;

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

  603.             Jpeg2000Band *band;

  604. 

  605.             if (!reslevel->band)

  606.                 continue;

  607. 

  608.             band = reslevel->band + bandno;

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

  610.                 if (band->prec) {

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

  612.                     av_freep(&prec->zerobits);

  613.                     av_freep(&prec->cblkincl);

  614.                     av_freep(&prec->cblk);

  615.                 }

  616.             }

  617. 

  618.             av_freep(&band->prec);

  619.         }

  620.         av_freep(&reslevel->band);

  621.     }

  622. 

  623.     ff_dwt_destroy(&comp->dwt);

  624.     av_freep(&comp->reslevel);

  625.     av_freep(&comp->i_data);

  626.     av_freep(&comp->f_data);

  627. }