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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/mem.h"
32 #include "avcodec.h"
33 #include "jpeg2000.h"
34 
35 #define SHL(a, n) ((n) >= 0 ? (a) << (n) : (a) >> -(n))
36 
37 /* tag tree routines */
38 
39 /* allocate the memory for tag tree */
40 static int32_t tag_tree_size(uint16_t w, uint16_t h)
41 {
42  uint32_t res = 0;
43  while (w > 1 || h > 1) {
44  res += w * h;
45  av_assert0(res + 1 < INT32_MAX);
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 
60  t = res = av_mallocz_array(tt_size, sizeof(*t));
61  if (!res)
62  return NULL;
63 
64  while (w > 1 || h > 1) {
65  int i, j;
66  pw = w;
67  ph = h;
68 
69  w = (w + 1) >> 1;
70  h = (h + 1) >> 1;
71  t2 = t + pw * ph;
72 
73  for (i = 0; i < ph; i++)
74  for (j = 0; j < pw; j++)
75  t[i * pw + j].parent = &t2[(i >> 1) * w + (j >> 1)];
76 
77  t = t2;
78  }
79  t[0].parent = NULL;
80  return res;
81 }
82 
83 static void tag_tree_zero(Jpeg2000TgtNode *t, int w, int h)
84 {
85  int i, siz = tag_tree_size(w, h);
86 
87  for (i = 0; i < siz; i++) {
88  t[i].val = 0;
89  t[i].vis = 0;
90  }
91 }
92 
93 uint8_t ff_jpeg2000_sigctxno_lut[256][4];
94 
95 static int getsigctxno(int flag, int bandno)
96 {
97  int h, v, d;
98 
99  h = ((flag & JPEG2000_T1_SIG_E) ? 1 : 0) +
100  ((flag & JPEG2000_T1_SIG_W) ? 1 : 0);
101  v = ((flag & JPEG2000_T1_SIG_N) ? 1 : 0) +
102  ((flag & JPEG2000_T1_SIG_S) ? 1 : 0);
103  d = ((flag & JPEG2000_T1_SIG_NE) ? 1 : 0) +
104  ((flag & JPEG2000_T1_SIG_NW) ? 1 : 0) +
105  ((flag & JPEG2000_T1_SIG_SE) ? 1 : 0) +
106  ((flag & JPEG2000_T1_SIG_SW) ? 1 : 0);
107 
108  if (bandno < 3) {
109  if (bandno == 1)
110  FFSWAP(int, h, v);
111  if (h == 2) return 8;
112  if (h == 1) {
113  if (v >= 1) return 7;
114  if (d >= 1) return 6;
115  return 5;
116  }
117  if (v == 2) return 4;
118  if (v == 1) return 3;
119  if (d >= 2) return 2;
120  if (d == 1) return 1;
121  } else {
122  if (d >= 3) return 8;
123  if (d == 2) {
124  if (h+v >= 1) return 7;
125  return 6;
126  }
127  if (d == 1) {
128  if (h+v >= 2) return 5;
129  if (h+v == 1) return 4;
130  return 3;
131  }
132  if (h+v >= 2) return 2;
133  if (h+v == 1) return 1;
134  }
135  return 0;
136 }
137 
138 uint8_t ff_jpeg2000_sgnctxno_lut[16][16], ff_jpeg2000_xorbit_lut[16][16];
139 
140 static const int contribtab[3][3] = { { 0, -1, 1 }, { -1, -1, 0 }, { 1, 0, 1 } };
141 static const int ctxlbltab[3][3] = { { 13, 12, 11 }, { 10, 9, 10 }, { 11, 12, 13 } };
142 static const int xorbittab[3][3] = { { 1, 1, 1 }, { 1, 0, 0 }, { 0, 0, 0 } };
143 
144 static int getsgnctxno(int flag, uint8_t *xorbit)
145 {
146  int vcontrib, hcontrib;
147 
148  hcontrib = contribtab[flag & JPEG2000_T1_SIG_E ? flag & JPEG2000_T1_SGN_E ? 1 : 2 : 0]
149  [flag & JPEG2000_T1_SIG_W ? flag & JPEG2000_T1_SGN_W ? 1 : 2 : 0] + 1;
150  vcontrib = contribtab[flag & JPEG2000_T1_SIG_S ? flag & JPEG2000_T1_SGN_S ? 1 : 2 : 0]
151  [flag & JPEG2000_T1_SIG_N ? flag & JPEG2000_T1_SGN_N ? 1 : 2 : 0] + 1;
152  *xorbit = xorbittab[hcontrib][vcontrib];
153 
154  return ctxlbltab[hcontrib][vcontrib];
155 }
156 
157 void av_cold ff_jpeg2000_init_tier1_luts(void)
158 {
159  int i, j;
160  for (i = 0; i < 256; i++)
161  for (j = 0; j < 4; j++)
162  ff_jpeg2000_sigctxno_lut[i][j] = getsigctxno(i, j);
163  for (i = 0; i < 16; i++)
164  for (j = 0; j < 16; j++)
165  ff_jpeg2000_sgnctxno_lut[i][j] =
166  getsgnctxno(i + (j << 8), &ff_jpeg2000_xorbit_lut[i][j]);
167 }
168 
169 void ff_jpeg2000_set_significance(Jpeg2000T1Context *t1, int x, int y,
170  int negative)
171 {
172  x++;
173  y++;
174  t1->flags[y][x] |= JPEG2000_T1_SIG;
175  if (negative) {
176  t1->flags[y][x + 1] |= JPEG2000_T1_SIG_W | JPEG2000_T1_SGN_W;
177  t1->flags[y][x - 1] |= JPEG2000_T1_SIG_E | JPEG2000_T1_SGN_E;
178  t1->flags[y + 1][x] |= JPEG2000_T1_SIG_N | JPEG2000_T1_SGN_N;
179  t1->flags[y - 1][x] |= JPEG2000_T1_SIG_S | JPEG2000_T1_SGN_S;
180  } else {
181  t1->flags[y][x + 1] |= JPEG2000_T1_SIG_W;
182  t1->flags[y][x - 1] |= JPEG2000_T1_SIG_E;
183  t1->flags[y + 1][x] |= JPEG2000_T1_SIG_N;
184  t1->flags[y - 1][x] |= JPEG2000_T1_SIG_S;
185  }
186  t1->flags[y + 1][x + 1] |= JPEG2000_T1_SIG_NW;
187  t1->flags[y + 1][x - 1] |= JPEG2000_T1_SIG_NE;
188  t1->flags[y - 1][x + 1] |= JPEG2000_T1_SIG_SW;
189  t1->flags[y - 1][x - 1] |= JPEG2000_T1_SIG_SE;
190 }
191 
192 static const uint8_t lut_gain[2][4] = { { 0, 0, 0, 0 }, { 0, 1, 1, 2 } };
193 
194 int ff_jpeg2000_init_component(Jpeg2000Component *comp,
195  Jpeg2000CodingStyle *codsty,
196  Jpeg2000QuantStyle *qntsty,
197  int cbps, int dx, int dy,
198  AVCodecContext *avctx)
199 {
200  uint8_t log2_band_prec_width, log2_band_prec_height;
201  int reslevelno, bandno, gbandno = 0, ret, i, j;
202  uint32_t csize;
203 
204  if (codsty->nreslevels2decode <= 0) {
205  av_log(avctx, AV_LOG_ERROR, "nreslevels2decode %d invalid or uninitialized\n", codsty->nreslevels2decode);
206  return AVERROR_INVALIDDATA;
207  }
208 
209  if (ret = ff_jpeg2000_dwt_init(&comp->dwt, comp->coord,
210  codsty->nreslevels2decode - 1,
211  codsty->transform))
212  return ret;
213  // component size comp->coord is uint16_t so ir cannot overflow
214  csize = (comp->coord[0][1] - comp->coord[0][0]) *
215  (comp->coord[1][1] - comp->coord[1][0]);
216 
217  if (codsty->transform == FF_DWT97) {
218  comp->i_data = NULL;
219  comp->f_data = av_mallocz_array(csize, sizeof(*comp->f_data));
220  if (!comp->f_data)
221  return AVERROR(ENOMEM);
222  } else {
223  comp->f_data = NULL;
224  comp->i_data = av_mallocz_array(csize, sizeof(*comp->i_data));
225  if (!comp->i_data)
226  return AVERROR(ENOMEM);
227  }
228  comp->reslevel = av_mallocz_array(codsty->nreslevels, sizeof(*comp->reslevel));
229  if (!comp->reslevel)
230  return AVERROR(ENOMEM);
231  /* LOOP on resolution levels */
232  for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
233  int declvl = codsty->nreslevels - reslevelno; // N_L -r see ISO/IEC 15444-1:2002 B.5
234  Jpeg2000ResLevel *reslevel = comp->reslevel + reslevelno;
235 
236  /* Compute borders for each resolution level.
237  * Computation of trx_0, trx_1, try_0 and try_1.
238  * see ISO/IEC 15444-1:2002 eq. B.5 and B-14 */
239  for (i = 0; i < 2; i++)
240  for (j = 0; j < 2; j++)
241  reslevel->coord[i][j] =
242  ff_jpeg2000_ceildivpow2(comp->coord_o[i][j], declvl - 1);
243  // update precincts size: 2^n value
244  reslevel->log2_prec_width = codsty->log2_prec_widths[reslevelno];
245  reslevel->log2_prec_height = codsty->log2_prec_heights[reslevelno];
246 
247  /* Number of bands for each resolution level */
248  if (reslevelno == 0)
249  reslevel->nbands = 1;
250  else
251  reslevel->nbands = 3;
252 
253  /* Number of precincts which span the tile for resolution level reslevelno
254  * see B.6 in ISO/IEC 15444-1:2002 eq. B-16
255  * num_precincts_x = |- trx_1 / 2 ^ log2_prec_width) -| - (trx_0 / 2 ^ log2_prec_width)
256  * num_precincts_y = |- try_1 / 2 ^ log2_prec_width) -| - (try_0 / 2 ^ log2_prec_width)
257  * for Dcinema profiles in JPEG 2000
258  * num_precincts_x = |- trx_1 / 2 ^ log2_prec_width) -|
259  * num_precincts_y = |- try_1 / 2 ^ log2_prec_width) -| */
260  if (reslevel->coord[0][1] == reslevel->coord[0][0])
261  reslevel->num_precincts_x = 0;
262  else
263  reslevel->num_precincts_x =
264  ff_jpeg2000_ceildivpow2(reslevel->coord[0][1],
265  reslevel->log2_prec_width) -
266  (reslevel->coord[0][0] >> reslevel->log2_prec_width);
267 
268  if (reslevel->coord[1][1] == reslevel->coord[1][0])
269  reslevel->num_precincts_y = 0;
270  else
271  reslevel->num_precincts_y =
272  ff_jpeg2000_ceildivpow2(reslevel->coord[1][1],
273  reslevel->log2_prec_height) -
274  (reslevel->coord[1][0] >> reslevel->log2_prec_height);
275 
276  reslevel->band = av_mallocz_array(reslevel->nbands, sizeof(*reslevel->band));
277  if (!reslevel->band)
278  return AVERROR(ENOMEM);
279 
280  for (bandno = 0; bandno < reslevel->nbands; bandno++, gbandno++) {
281  Jpeg2000Band *band = reslevel->band + bandno;
282  int cblkno, precno;
283  int nb_precincts;
284 
285  /* TODO: Implementation of quantization step not finished,
286  * see ISO/IEC 15444-1:2002 E.1 and A.6.4. */
287  switch (qntsty->quantsty) {
288  uint8_t gain;
289  int numbps;
290  case JPEG2000_QSTY_NONE:
291  /* TODO: to verify. No quantization in this case */
292  band->f_stepsize = 1;
293  break;
294  case JPEG2000_QSTY_SI:
295  /*TODO: Compute formula to implement. */
296  numbps = cbps +
297  lut_gain[codsty->transform == FF_DWT53][bandno + (reslevelno > 0)];
298  band->f_stepsize = SHL(2048 + qntsty->mant[gbandno],
299  2 + numbps - qntsty->expn[gbandno]);
300  break;
301  case JPEG2000_QSTY_SE:
302  /* Exponent quantization step.
303  * Formula:
304  * delta_b = 2 ^ (R_b - expn_b) * (1 + (mant_b / 2 ^ 11))
305  * R_b = R_I + log2 (gain_b )
306  * see ISO/IEC 15444-1:2002 E.1.1 eqn. E-3 and E-4 */
307  /* TODO/WARN: value of log2 (gain_b ) not taken into account
308  * but it works (compared to OpenJPEG). Why?
309  * Further investigation needed. */
310  gain = cbps;
311  band->f_stepsize = pow(2.0, gain - qntsty->expn[gbandno]);
312  band->f_stepsize *= qntsty->mant[gbandno] / 2048.0 + 1.0;
313  break;
314  default:
315  band->f_stepsize = 0;
316  av_log(avctx, AV_LOG_ERROR, "Unknown quantization format\n");
317  break;
318  }
319  /* FIXME: In openjepg code stespize = stepsize * 0.5. Why?
320  * If not set output of entropic decoder is not correct. */
321  if (!av_codec_is_encoder(avctx->codec))
322  band->f_stepsize *= 0.5;
323 
324  band->i_stepsize = band->f_stepsize * (1 << 15);
325 
326  /* computation of tbx_0, tbx_1, tby_0, tby_1
327  * see ISO/IEC 15444-1:2002 B.5 eq. B-15 and tbl B.1
328  * codeblock width and height is computed for
329  * DCI JPEG 2000 codeblock_width = codeblock_width = 32 = 2 ^ 5 */
330  if (reslevelno == 0) {
331  /* for reslevelno = 0, only one band, x0_b = y0_b = 0 */
332  for (i = 0; i < 2; i++)
333  for (j = 0; j < 2; j++)
334  band->coord[i][j] =
335  ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] - comp->coord_o[i][0],
336  declvl - 1);
337  log2_band_prec_width = reslevel->log2_prec_width;
338  log2_band_prec_height = reslevel->log2_prec_height;
339  /* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */
340  band->log2_cblk_width = FFMIN(codsty->log2_cblk_width,
341  reslevel->log2_prec_width);
342  band->log2_cblk_height = FFMIN(codsty->log2_cblk_height,
343  reslevel->log2_prec_height);
344  } else {
345  /* 3 bands x0_b = 1 y0_b = 0; x0_b = 0 y0_b = 1; x0_b = y0_b = 1 */
346  /* x0_b and y0_b are computed with ((bandno + 1 >> i) & 1) */
347  for (i = 0; i < 2; i++)
348  for (j = 0; j < 2; j++)
349  /* Formula example for tbx_0 = ceildiv((tcx_0 - 2 ^ (declvl - 1) * x0_b) / declvl) */
350  band->coord[i][j] =
351  ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] - comp->coord_o[i][0] -
352  (((bandno + 1 >> i) & 1) << declvl - 1),
353  declvl);
354  /* TODO: Manage case of 3 band offsets here or
355  * in coding/decoding function? */
356 
357  /* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */
358  band->log2_cblk_width = FFMIN(codsty->log2_cblk_width,
359  reslevel->log2_prec_width - 1);
360  band->log2_cblk_height = FFMIN(codsty->log2_cblk_height,
361  reslevel->log2_prec_height - 1);
362 
363  log2_band_prec_width = reslevel->log2_prec_width - 1;
364  log2_band_prec_height = reslevel->log2_prec_height - 1;
365  }
366 
367  for (j = 0; j < 2; j++)
368  band->coord[0][j] = ff_jpeg2000_ceildiv(band->coord[0][j], dx);
369  for (j = 0; j < 2; j++)
370  band->coord[1][j] = ff_jpeg2000_ceildiv(band->coord[1][j], dy);
371 
372  if (reslevel->num_precincts_x * (uint64_t)reslevel->num_precincts_y > INT_MAX) {
373  band->prec = NULL;
374  return AVERROR(ENOMEM);
375  }
376  nb_precincts = reslevel->num_precincts_x * reslevel->num_precincts_y;
377  band->prec = av_mallocz_array(nb_precincts, sizeof(*band->prec));
378  if (!band->prec)
379  return AVERROR(ENOMEM);
380 
381  for (precno = 0; precno < nb_precincts; precno++) {
382  Jpeg2000Prec *prec = band->prec + precno;
383  int nb_codeblocks;
384 
385  /* TODO: Explain formula for JPEG200 DCINEMA. */
386  /* TODO: Verify with previous count of codeblocks per band */
387 
388  /* Compute P_x0 */
389  prec->coord[0][0] = (precno % reslevel->num_precincts_x) *
390  (1 << log2_band_prec_width);
391  prec->coord[0][0] = FFMAX(prec->coord[0][0], band->coord[0][0]);
392 
393  /* Compute P_y0 */
394  prec->coord[1][0] = (precno / reslevel->num_precincts_x) *
395  (1 << log2_band_prec_height);
396  prec->coord[1][0] = FFMAX(prec->coord[1][0], band->coord[1][0]);
397 
398  /* Compute P_x1 */
399  prec->coord[0][1] = prec->coord[0][0] +
400  (1 << log2_band_prec_width);
401  prec->coord[0][1] = FFMIN(prec->coord[0][1], band->coord[0][1]);
402 
403  /* Compute P_y1 */
404  prec->coord[1][1] = prec->coord[1][0] +
405  (1 << log2_band_prec_height);
406  prec->coord[1][1] = FFMIN(prec->coord[1][1], band->coord[1][1]);
407 
408  prec->nb_codeblocks_width =
409  ff_jpeg2000_ceildivpow2(prec->coord[0][1] -
410  prec->coord[0][0],
411  band->log2_cblk_width);
412  prec->nb_codeblocks_height =
413  ff_jpeg2000_ceildivpow2(prec->coord[1][1] -
414  prec->coord[1][0],
415  band->log2_cblk_height);
416 
417  /* Tag trees initialization */
418  prec->cblkincl =
419  ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,
420  prec->nb_codeblocks_height);
421  if (!prec->cblkincl)
422  return AVERROR(ENOMEM);
423 
424  prec->zerobits =
425  ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,
426  prec->nb_codeblocks_height);
427  if (!prec->zerobits)
428  return AVERROR(ENOMEM);
429 
430  if (prec->nb_codeblocks_width * (uint64_t)prec->nb_codeblocks_height > INT_MAX) {
431  prec->cblk = NULL;
432  return AVERROR(ENOMEM);
433  }
434  nb_codeblocks = prec->nb_codeblocks_width * prec->nb_codeblocks_height;
435  prec->cblk = av_mallocz_array(nb_codeblocks, sizeof(*prec->cblk));
436  if (!prec->cblk)
437  return AVERROR(ENOMEM);
438  for (cblkno = 0; cblkno < nb_codeblocks; cblkno++) {
439  Jpeg2000Cblk *cblk = prec->cblk + cblkno;
440  uint16_t Cx0, Cy0;
441 
442  /* Compute coordinates of codeblocks */
443  /* Compute Cx0*/
444  Cx0 = (prec->coord[0][0] >> band->log2_cblk_width) << band->log2_cblk_width;
445  Cx0 = Cx0 + ((cblkno % prec->nb_codeblocks_width) << band->log2_cblk_width);
446  cblk->coord[0][0] = FFMAX(Cx0, prec->coord[0][0]);
447 
448  /* Compute Cy0*/
449  Cy0 = (prec->coord[1][0] >> band->log2_cblk_height) << band->log2_cblk_height;
450  Cy0 = Cy0 + ((cblkno / prec->nb_codeblocks_width) << band->log2_cblk_height);
451  cblk->coord[1][0] = FFMAX(Cy0, prec->coord[1][0]);
452 
453  /* Compute Cx1 */
454  cblk->coord[0][1] = FFMIN(Cx0 + (1 << band->log2_cblk_width),
455  prec->coord[0][1]);
456 
457  /* Compute Cy1 */
458  cblk->coord[1][1] = FFMIN(Cy0 + (1 << band->log2_cblk_height),
459  prec->coord[1][1]);
460  /* Update code-blocks coordinates according sub-band position */
461  if ((bandno + !!reslevelno) & 1) {
462  cblk->coord[0][0] += comp->reslevel[reslevelno-1].coord[0][1] -
463  comp->reslevel[reslevelno-1].coord[0][0];
464  cblk->coord[0][1] += comp->reslevel[reslevelno-1].coord[0][1] -
465  comp->reslevel[reslevelno-1].coord[0][0];
466  }
467  if ((bandno + !!reslevelno) & 2) {
468  cblk->coord[1][0] += comp->reslevel[reslevelno-1].coord[1][1] -
469  comp->reslevel[reslevelno-1].coord[1][0];
470  cblk->coord[1][1] += comp->reslevel[reslevelno-1].coord[1][1] -
471  comp->reslevel[reslevelno-1].coord[1][0];
472  }
473 
474  cblk->zero = 0;
475  cblk->lblock = 3;
476  cblk->length = 0;
477  cblk->lengthinc = 0;
478  cblk->npasses = 0;
479  }
480  }
481  }
482  }
483  return 0;
484 }
485 
486 void ff_jpeg2000_reinit(Jpeg2000Component *comp, Jpeg2000CodingStyle *codsty)
487 {
488  int reslevelno, bandno, cblkno, precno;
489  for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
490  Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
491  for (bandno = 0; bandno < rlevel->nbands; bandno++) {
492  Jpeg2000Band *band = rlevel->band + bandno;
493  for(precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++) {
494  Jpeg2000Prec *prec = band->prec + precno;
495  tag_tree_zero(prec->zerobits, prec->nb_codeblocks_width, prec->nb_codeblocks_height);
496  tag_tree_zero(prec->cblkincl, prec->nb_codeblocks_width, prec->nb_codeblocks_height);
497  for (cblkno = 0; cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height; cblkno++) {
498  Jpeg2000Cblk *cblk = prec->cblk + cblkno;
499  cblk->length = 0;
500  cblk->lblock = 3;
501  }
502  }
503  }
504  }
505 }
506 
507 void ff_jpeg2000_cleanup(Jpeg2000Component *comp, Jpeg2000CodingStyle *codsty)
508 {
509  int reslevelno, bandno, precno;
510  for (reslevelno = 0;
511  comp->reslevel && reslevelno < codsty->nreslevels;
512  reslevelno++) {
513  Jpeg2000ResLevel *reslevel;
514 
515  if (!comp->reslevel)
516  continue;
517 
518  reslevel = comp->reslevel + reslevelno;
519  for (bandno = 0; bandno < reslevel->nbands; bandno++) {
520  Jpeg2000Band *band;
521 
522  if (!reslevel->band)
523  continue;
524 
525  band = reslevel->band + bandno;
526  for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++) {
527  if (band->prec) {
528  Jpeg2000Prec *prec = band->prec + precno;
529  av_freep(&prec->zerobits);
530  av_freep(&prec->cblkincl);
531  av_freep(&prec->cblk);
532  }
533  }
534 
535  av_freep(&band->prec);
536  }
537  av_freep(&reslevel->band);
538  }
539 
540  ff_dwt_destroy(&comp->dwt);
541  av_freep(&comp->reslevel);
542  av_freep(&comp->i_data);
543  av_freep(&comp->f_data);
544 }
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