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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 Libav.

  7.  *

  8.  * Libav 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.  * Libav 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 Libav; 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/common.h"

  30. #include "libavutil/mem.h"

  31. #include "avcodec.h"

  32. #include "jpeg2000.h"

  33. 

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

  35. 

  36. /* tag tree routines */

  37. 

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

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

  40. {

  41.     uint32_t res = 0;

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

  43.         res += w * h;

  44.         if (res + 1 >= INT32_MAX)

  45.             return -1;

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

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

  48.     }

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

  50. }

  51. 

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

  53. {

  54.     int pw = w, ph = h;

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

  56.     int32_t tt_size;

  57. 

  58.     tt_size = tag_tree_size(w, h);

  59.     if (tt_size == -1)

  60.         return NULL;

  61. 

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

  63.     if (!res)

  64.         return NULL;

  65. 

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

  67.         int i, j;

  68.         pw = w;

  69.         ph = h;

  70. 

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

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

  73.         t2 = t + pw * ph;

  74. 

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

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

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

  78. 

  79.         t = t2;

  80.     }

  81.     t[0].parent = NULL;

  82.     return res;

  83. }

  84. 

  85. uint8_t ff_jpeg2000_sigctxno_lut[256][4];

  86. 

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

  88. {

  89.     int h, v, d;

  90. 

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

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

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

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

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

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

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

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

  99.     if (bandno < 3) {

  100.         if (bandno == 1)

  101.             FFSWAP(int, h, v);

  102.         if (h == 2)

  103.             return 8;

  104.         if (h == 1) {

  105.             if (v >= 1)

  106.                 return 7;

  107.             if (d >= 1)

  108.                 return 6;

  109.             return 5;

  110.         }

  111.         if (v == 2)

  112.             return 4;

  113.         if (v == 1)

  114.             return 3;

  115.         if (d >= 2)

  116.             return 2;

  117.         if (d == 1)

  118.             return 1;

  119.     } else {

  120.         if (d >= 3)

  121.             return 8;

  122.         if (d == 2) {

  123.             if (h + v >= 1)

  124.                 return 7;

  125.             return 6;

  126.         }

  127.         if (d == 1) {

  128.             if (h + v >= 2)

  129.                 return 5;

  130.             if (h + v == 1)

  131.                 return 4;

  132.             return 3;

  133.         }

  134.         if (h + v >= 2)

  135.             return 2;

  136.         if (h + v == 1)

  137.             return 1;

  138.     }

  139.     return 0;

  140. }

  141. 

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

  143. 

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

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

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

  147. 

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

  149. {

  150.     int vcontrib, hcontrib;

  151. 

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

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

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

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

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

  157. 

  158.     return ctxlbltab[hcontrib][vcontrib];

  159. }

  160. 

  161. void av_cold ff_jpeg2000_init_tier1_luts(void)

  162. {

  163.     int i, j;

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

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

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

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

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

  169.             ff_jpeg2000_sgnctxno_lut[i][j] =

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

  171. }

  172. 

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

  174.                                   int negative)

  175. {

  176.     x++;

  177.     y++;

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

  179.     if (negative) {

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

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

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

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

  184.     } else {

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

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

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

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

  189.     }

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

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

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

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

  194. }

  195. 

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

  197. 

  198. static void init_band_stepsize(AVCodecContext *avctx,

  199.                                Jpeg2000Band *band,

  200.                                Jpeg2000CodingStyle *codsty,

  201.                                Jpeg2000QuantStyle *qntsty,

  202.                                int bandno, int gbandno, int reslevelno,

  203.                                int cbps)

  204. {

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

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

  207.     switch (qntsty->quantsty) {

  208.         uint8_t gain;

  209.         int numbps;

  210.     case JPEG2000_QSTY_NONE:

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

  212.         band->f_stepsize = 1;

  213.         break;

  214.     case JPEG2000_QSTY_SI:

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

  216.         numbps = cbps +

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

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

  219.                                2 + numbps - qntsty->expn[gbandno]);

  220.         break;

  221.     case JPEG2000_QSTY_SE:

  222.         /* Exponent quantization step.

  223.          * Formula:

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

  225.          * R_b = R_I + log2 (gain_b )

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

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

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

  229.          * Further investigation needed. */

  230.         gain            = cbps;

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

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

  233.         break;

  234.     default:

  235.         band->f_stepsize = 0;

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

  237.         break;

  238.     }

  239.     /* FIXME: In OpenJPEG code stespize = stepsize * 0.5. Why?

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

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

  242.         band->f_stepsize *= 0.5;

  243. 

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

  245. }

  246. 

  247. static int init_prec(Jpeg2000Band *band,

  248.                      Jpeg2000ResLevel *reslevel,

  249.                      Jpeg2000Component *comp,

  250.                      int precno, int bandno, int reslevelno,

  251.                      int log2_band_prec_width,

  252.                      int log2_band_prec_height)

  253. {

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

  255.     int nb_codeblocks, cblkno;

  256. 

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

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

  259. 

  260.     /* Compute P_x0 */

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

  262.                         (1 << log2_band_prec_width);

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

  264. 

  265.     /* Compute P_y0 */

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

  267.                         (1 << log2_band_prec_height);

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

  269. 

  270.     /* Compute P_x1 */

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

  272.                         (1 << log2_band_prec_width);

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

  274. 

  275.     /* Compute P_y1 */

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

  277.                         (1 << log2_band_prec_height);

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

  279. 

  280.     prec->nb_codeblocks_width =

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

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

  283.                                 band->log2_cblk_width);

  284.     prec->nb_codeblocks_height =

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

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

  287.                                 band->log2_cblk_height);

  288. 

  289.     /* Tag trees initialization */

  290.     prec->cblkincl =

  291.         ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,

  292.                                   prec->nb_codeblocks_height);

  293.     if (!prec->cblkincl)

  294.         return AVERROR(ENOMEM);

  295. 

  296.     prec->zerobits =

  297.         ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,

  298.                                   prec->nb_codeblocks_height);

  299.     if (!prec->zerobits)

  300.         return AVERROR(ENOMEM);

  301. 

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

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

  304.     if (!prec->cblk)

  305.         return AVERROR(ENOMEM);

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

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

  308.         uint16_t Cx0, Cy0;

  309. 

  310.         /* Compute coordinates of codeblocks */

  311.         /* Compute Cx0*/

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

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

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

  315. 

  316.         /* Compute Cy0*/

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

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

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

  320. 

  321.         /* Compute Cx1 */

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

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

  324. 

  325.         /* Compute Cy1 */

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

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

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

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

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

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

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

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

  334.         }

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

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

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

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

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

  340.         }

  341. 

  342.         cblk->zero      = 0;

  343.         cblk->lblock    = 3;

  344.         cblk->length    = 0;

  345.         cblk->lengthinc = 0;

  346.         cblk->npasses   = 0;

  347.     }

  348. 

  349.     return 0;

  350. }

  351. 

  352. static int init_band(AVCodecContext *avctx,

  353.                      Jpeg2000ResLevel *reslevel,

  354.                      Jpeg2000Component *comp,

  355.                      Jpeg2000CodingStyle *codsty,

  356.                      Jpeg2000QuantStyle *qntsty,

  357.                      int bandno, int gbandno, int reslevelno,

  358.                      int cbps, int dx, int dy)

  359. {

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

  361.     uint8_t log2_band_prec_width, log2_band_prec_height;

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

  363.     int precno;

  364.     int nb_precincts;

  365.     int i, j, ret;

  366. 

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

  368. 

  369. 

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

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

  372.      * codeblock width and height is computed for

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

  374.     if (reslevelno == 0) {

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

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

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

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

  379.                     ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] - comp->coord_o[i][0],

  380.                                             declvl - 1);

  381.         log2_band_prec_width  = reslevel->log2_prec_width;

  382.         log2_band_prec_height = reslevel->log2_prec_height;

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

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

  385.                                        reslevel->log2_prec_width);

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

  387.                                        reslevel->log2_prec_height);

  388.     } else {

  389.         /* 3 bands x0_b = 1 y0_b = 0; x0_b = 0 y0_b = 1; x0_b = y0_b = 1 */

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

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

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

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

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

  395.                     ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] - comp->coord_o[i][0] -

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

  397.                                             declvl);

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

  399.          * in coding/decoding function? */

  400. 

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

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

  403.                                        reslevel->log2_prec_width - 1);

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

  405.                                        reslevel->log2_prec_height - 1);

  406. 

  407.         log2_band_prec_width  = reslevel->log2_prec_width  - 1;

  408.         log2_band_prec_height = reslevel->log2_prec_height - 1;

  409.     }

  410. 

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

  412.         band->coord[0][j] = ff_jpeg2000_ceildiv(band->coord[0][j], dx);

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

  414.         band->coord[1][j] = ff_jpeg2000_ceildiv(band->coord[1][j], dy);

  415. 

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

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

  418.     if (!band->prec)

  419.         return AVERROR(ENOMEM);

  420. 

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

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

  423.                         precno, bandno, reslevelno,

  424.                         log2_band_prec_width, log2_band_prec_height);

  425.         if (ret < 0)

  426.             return ret;

  427.     }

  428. 

  429.     return 0;

  430. }

  431. 

  432. int ff_jpeg2000_init_component(Jpeg2000Component *comp,

  433.                                Jpeg2000CodingStyle *codsty,

  434.                                Jpeg2000QuantStyle *qntsty,

  435.                                int cbps, int dx, int dy,

  436.                                AVCodecContext *avctx)

  437. {

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

  439.     uint32_t csize;

  440. 

  441.     if (!codsty->nreslevels2decode) {

  442.         av_log(avctx, AV_LOG_ERROR, "nreslevels2decode uninitialized\n");

  443.         return AVERROR_INVALIDDATA;

  444.     }

  445. 

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

  447.                                    codsty->nreslevels2decode - 1,

  448.                                    codsty->transform))

  449.         return ret;

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

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

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

  453. 

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

  455.         comp->i_data = NULL;

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

  457.         if (!comp->f_data)

  458.             return AVERROR(ENOMEM);

  459.     } else {

  460.         comp->f_data = NULL;

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

  462.         if (!comp->i_data)

  463.             return AVERROR(ENOMEM);

  464.     }

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

  466.     if (!comp->reslevel)

  467.         return AVERROR(ENOMEM);

  468.     /* LOOP on resolution levels */

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

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

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

  472. 

  473.         /* Compute borders for each resolution level.

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

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

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

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

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

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

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

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

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

  483. 

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

  485.         if (reslevelno == 0)

  486.             reslevel->nbands = 1;

  487.         else

  488.             reslevel->nbands = 3;

  489. 

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

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

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

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

  494.          * for Dcinema profiles in JPEG 2000

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

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

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

  498.             reslevel->num_precincts_x = 0;

  499.         else

  500.             reslevel->num_precincts_x =

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

  502.                                         reslevel->log2_prec_width) -

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

  504. 

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

  506.             reslevel->num_precincts_y = 0;

  507.         else

  508.             reslevel->num_precincts_y =

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

  510.                                         reslevel->log2_prec_height) -

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

  512. 

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

  514.         if (!reslevel->band)

  515.             return AVERROR(ENOMEM);

  516. 

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

  518.             ret = init_band(avctx, reslevel,

  519.                             comp, codsty, qntsty,

  520.                             bandno, gbandno, reslevelno,

  521.                             cbps, dx, dy);

  522.             if (ret < 0)

  523.                 return ret;

  524.         }

  525.     }

  526.     return 0;

  527. }

  528. 

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

  530. {

  531.     int reslevelno, bandno, precno;

  532.     for (reslevelno = 0;

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

  534.          reslevelno++) {

  535.         Jpeg2000ResLevel *reslevel;

  536. 

  537.         if (!comp->reslevel)

  538.             continue;

  539. 

  540.         reslevel = comp->reslevel + reslevelno;

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

  542.             Jpeg2000Band *band;

  543. 

  544.             if (!reslevel->band)

  545.                 continue;

  546. 

  547.             band = reslevel->band + bandno;

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

  549.                 Jpeg2000Prec *prec;

  550. 

  551.                 if (!band->prec)

  552.                     continue;

  553. 

  554.                 prec = band->prec + precno;

  555.                 av_freep(&prec->zerobits);

  556.                 av_freep(&prec->cblkincl);

  557.                 av_freep(&prec->cblk);

  558. 

  559.             }

  560. 

  561.             av_freep(&band->prec);

  562.         }

  563.         av_freep(&reslevel->band);

  564.     }

  565. 

  566.     ff_dwt_destroy(&comp->dwt);

  567.     av_freep(&comp->reslevel);

  568.     av_freep(&comp->i_data);

  569.     av_freep(&comp->f_data);

  570. }