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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 "internal.h"
35 #include "jpeg2000.h"
36 
37 #define SHL(a, n) ((n) >= 0 ? (a) << (n) : (a) >> -(n))
38 
39 /* tag tree routines */
40 
41 /* allocate the memory for tag tree */
ff_tag_tree_size(int w,int h)42 int32_t ff_tag_tree_size(int w, int h)
43 {
44     int64_t res = 0;
45     while (w > 1 || h > 1) {
46         res += w * (int64_t)h;
47         av_assert0(res + 1 < INT32_MAX);
48         w = (w + 1) >> 1;
49         h = (h + 1) >> 1;
50     }
51     return (int32_t)(res + 1);
52 }
53 
ff_jpeg2000_tag_tree_init(int w,int h)54 static Jpeg2000TgtNode *ff_jpeg2000_tag_tree_init(int w, int h)
55 {
56     int pw = w, ph = h;
57     Jpeg2000TgtNode *res, *t, *t2;
58     int32_t tt_size;
59 
60     tt_size = ff_tag_tree_size(w, h);
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 
ff_tag_tree_zero(Jpeg2000TgtNode * t,int w,int h,int val)85 void ff_tag_tree_zero(Jpeg2000TgtNode *t, int w, int h, int val)
86 {
87     int i, siz = ff_tag_tree_size(w, h);
88 
89     for (i = 0; i < siz; i++) {
90         t[i].val = val;
91         t[i].temp_val = 0;
92         t[i].vis = 0;
93     }
94 }
95 
96 uint8_t ff_jpeg2000_sigctxno_lut[256][4];
97 
getsigctxno(int flag,int bandno)98 static int getsigctxno(int flag, int bandno)
99 {
100     int h, v, d;
101 
102     h = ((flag & JPEG2000_T1_SIG_E)  ? 1 : 0) +
103         ((flag & JPEG2000_T1_SIG_W)  ? 1 : 0);
104     v = ((flag & JPEG2000_T1_SIG_N)  ? 1 : 0) +
105         ((flag & JPEG2000_T1_SIG_S)  ? 1 : 0);
106     d = ((flag & JPEG2000_T1_SIG_NE) ? 1 : 0) +
107         ((flag & JPEG2000_T1_SIG_NW) ? 1 : 0) +
108         ((flag & JPEG2000_T1_SIG_SE) ? 1 : 0) +
109         ((flag & JPEG2000_T1_SIG_SW) ? 1 : 0);
110 
111     if (bandno < 3) {
112         if (bandno == 1)
113             FFSWAP(int, h, v);
114         if (h == 2) return 8;
115         if (h == 1) {
116             if (v >= 1) return 7;
117             if (d >= 1) return 6;
118             return 5;
119         }
120         if (v == 2) return 4;
121         if (v == 1) return 3;
122         if (d >= 2) return 2;
123         if (d == 1) return 1;
124     } else {
125         if (d >= 3) return 8;
126         if (d == 2) {
127             if (h+v >= 1) return 7;
128             return 6;
129         }
130         if (d == 1) {
131             if (h+v >= 2) return 5;
132             if (h+v == 1) return 4;
133             return 3;
134         }
135         if (h+v >= 2) return 2;
136         if (h+v == 1) return 1;
137     }
138     return 0;
139 }
140 
141 uint8_t ff_jpeg2000_sgnctxno_lut[16][16], ff_jpeg2000_xorbit_lut[16][16];
142 
143 static const int contribtab[3][3] = { {  0, -1,  1 }, { -1, -1,  0 }, {  1,  0,  1 } };
144 static const int  ctxlbltab[3][3] = { { 13, 12, 11 }, { 10,  9, 10 }, { 11, 12, 13 } };
145 static const int  xorbittab[3][3] = { {  1,  1,  1 }, {  1,  0,  0 }, {  0,  0,  0 } };
146 
getsgnctxno(int flag,uint8_t * xorbit)147 static int getsgnctxno(int flag, uint8_t *xorbit)
148 {
149     int vcontrib, hcontrib;
150 
151     hcontrib = contribtab[flag & JPEG2000_T1_SIG_E ? flag & JPEG2000_T1_SGN_E ? 1 : 2 : 0]
152                          [flag & JPEG2000_T1_SIG_W ? flag & JPEG2000_T1_SGN_W ? 1 : 2 : 0] + 1;
153     vcontrib = contribtab[flag & JPEG2000_T1_SIG_S ? flag & JPEG2000_T1_SGN_S ? 1 : 2 : 0]
154                          [flag & JPEG2000_T1_SIG_N ? flag & JPEG2000_T1_SGN_N ? 1 : 2 : 0] + 1;
155     *xorbit = xorbittab[hcontrib][vcontrib];
156 
157     return ctxlbltab[hcontrib][vcontrib];
158 }
159 
ff_jpeg2000_init_tier1_luts(void)160 void av_cold ff_jpeg2000_init_tier1_luts(void)
161 {
162     int i, j;
163     for (i = 0; i < 256; i++)
164         for (j = 0; j < 4; j++)
165             ff_jpeg2000_sigctxno_lut[i][j] = getsigctxno(i, j);
166     for (i = 0; i < 16; i++)
167         for (j = 0; j < 16; j++)
168             ff_jpeg2000_sgnctxno_lut[i][j] =
169                 getsgnctxno(i + (j << 8), &ff_jpeg2000_xorbit_lut[i][j]);
170 }
171 
ff_jpeg2000_set_significance(Jpeg2000T1Context * t1,int x,int y,int negative)172 void ff_jpeg2000_set_significance(Jpeg2000T1Context *t1, int x, int y,
173                                   int negative)
174 {
175     x++;
176     y++;
177     t1->flags[(y) * t1->stride + x] |= JPEG2000_T1_SIG;
178     if (negative) {
179         t1->flags[(y) * t1->stride + x + 1] |= JPEG2000_T1_SIG_W | JPEG2000_T1_SGN_W;
180         t1->flags[(y) * t1->stride + x - 1] |= JPEG2000_T1_SIG_E | JPEG2000_T1_SGN_E;
181         t1->flags[(y + 1) * t1->stride + x] |= JPEG2000_T1_SIG_N | JPEG2000_T1_SGN_N;
182         t1->flags[(y - 1) * t1->stride + x] |= JPEG2000_T1_SIG_S | JPEG2000_T1_SGN_S;
183     } else {
184         t1->flags[(y) * t1->stride + x + 1] |= JPEG2000_T1_SIG_W;
185         t1->flags[(y) * t1->stride + x - 1] |= JPEG2000_T1_SIG_E;
186         t1->flags[(y + 1) * t1->stride + x] |= JPEG2000_T1_SIG_N;
187         t1->flags[(y - 1) * t1->stride + x] |= JPEG2000_T1_SIG_S;
188     }
189     t1->flags[(y + 1) * t1->stride + x + 1] |= JPEG2000_T1_SIG_NW;
190     t1->flags[(y + 1) * t1->stride + x - 1] |= JPEG2000_T1_SIG_NE;
191     t1->flags[(y - 1) * t1->stride + x + 1] |= JPEG2000_T1_SIG_SW;
192     t1->flags[(y - 1) * t1->stride + x - 1] |= JPEG2000_T1_SIG_SE;
193 }
194 
195 // static const uint8_t lut_gain[2][4] = { { 0, 0, 0, 0 }, { 0, 1, 1, 2 } }; (unused)
196 
init_band_stepsize(AVCodecContext * avctx,Jpeg2000Band * band,Jpeg2000CodingStyle * codsty,Jpeg2000QuantStyle * qntsty,int bandno,int gbandno,int reslevelno,int cbps)197 static void init_band_stepsize(AVCodecContext *avctx,
198                                Jpeg2000Band *band,
199                                Jpeg2000CodingStyle *codsty,
200                                Jpeg2000QuantStyle *qntsty,
201                                int bandno, int gbandno, int reslevelno,
202                                int cbps)
203 {
204     /* TODO: Implementation of quantization step not finished,
205      * see ISO/IEC 15444-1:2002 E.1 and A.6.4. */
206     switch (qntsty->quantsty) {
207         uint8_t gain;
208     case JPEG2000_QSTY_NONE:
209         /* TODO: to verify. No quantization in this case */
210         band->f_stepsize = 1;
211         break;
212     case JPEG2000_QSTY_SI:
213         /*TODO: Compute formula to implement. */
214 //         numbps = cbps +
215 //                  lut_gain[codsty->transform == FF_DWT53][bandno + (reslevelno > 0)];
216 //         band->f_stepsize = SHL(2048 + qntsty->mant[gbandno],
217 //                                2 + numbps - qntsty->expn[gbandno]);
218 //         break;
219     case JPEG2000_QSTY_SE:
220         /* Exponent quantization step.
221          * Formula:
222          * delta_b = 2 ^ (R_b - expn_b) * (1 + (mant_b / 2 ^ 11))
223          * R_b = R_I + log2 (gain_b )
224          * see ISO/IEC 15444-1:2002 E.1.1 eqn. E-3 and E-4 */
225         gain            = cbps;
226         band->f_stepsize  = ff_exp2fi(gain - qntsty->expn[gbandno]);
227         band->f_stepsize *= qntsty->mant[gbandno] / 2048.0 + 1.0;
228         break;
229     default:
230         band->f_stepsize = 0;
231         av_log(avctx, AV_LOG_ERROR, "Unknown quantization format\n");
232         break;
233     }
234     if (codsty->transform != FF_DWT53) {
235         int lband = 0;
236         switch (bandno + (reslevelno > 0)) {
237             case 1:
238             case 2:
239                 band->f_stepsize *= F_LFTG_X * 2;
240                 lband = 1;
241                 break;
242             case 3:
243                 band->f_stepsize *= F_LFTG_X * F_LFTG_X * 4;
244                 break;
245         }
246         if (codsty->transform == FF_DWT97) {
247             band->f_stepsize *= pow(F_LFTG_K, 2*(codsty->nreslevels2decode - reslevelno) + lband - 2);
248         }
249     }
250 
251     if (band->f_stepsize > (INT_MAX >> 15)) {
252         band->f_stepsize = 0;
253         av_log(avctx, AV_LOG_ERROR, "stepsize out of range\n");
254     }
255 
256     band->i_stepsize = band->f_stepsize * (1 << 15);
257 
258     /* FIXME: In OpenJPEG code stepsize = stepsize * 0.5. Why?
259      * If not set output of entropic decoder is not correct. */
260     if (!av_codec_is_encoder(avctx->codec))
261         band->f_stepsize *= 0.5;
262 }
263 
init_prec(AVCodecContext * avctx,Jpeg2000Band * band,Jpeg2000ResLevel * reslevel,Jpeg2000Component * comp,Jpeg2000CodingStyle * codsty,int precno,int bandno,int reslevelno,int log2_band_prec_width,int log2_band_prec_height)264 static int init_prec(AVCodecContext *avctx,
265                      Jpeg2000Band *band,
266                      Jpeg2000ResLevel *reslevel,
267                      Jpeg2000Component *comp,
268                      Jpeg2000CodingStyle *codsty,
269                      int precno, int bandno, int reslevelno,
270                      int log2_band_prec_width,
271                      int log2_band_prec_height)
272 {
273     Jpeg2000Prec *prec = band->prec + precno;
274     int nb_codeblocks, cblkno;
275 
276     prec->decoded_layers = 0;
277 
278     /* TODO: Explain formula for JPEG200 DCINEMA. */
279     /* TODO: Verify with previous count of codeblocks per band */
280 
281     /* Compute P_x0 */
282     prec->coord[0][0] = ((reslevel->coord[0][0] >> reslevel->log2_prec_width) + precno % reslevel->num_precincts_x) *
283                         (1 << log2_band_prec_width);
284 
285     /* Compute P_y0 */
286     prec->coord[1][0] = ((reslevel->coord[1][0] >> reslevel->log2_prec_height) + precno / reslevel->num_precincts_x) *
287                         (1 << log2_band_prec_height);
288 
289     /* Compute P_x1 */
290     prec->coord[0][1] = prec->coord[0][0] +
291                         (1 << log2_band_prec_width);
292     prec->coord[0][0] = FFMAX(prec->coord[0][0], band->coord[0][0]);
293     prec->coord[0][1] = FFMIN(prec->coord[0][1], band->coord[0][1]);
294 
295     /* Compute P_y1 */
296     prec->coord[1][1] = prec->coord[1][0] +
297                         (1 << log2_band_prec_height);
298     prec->coord[1][0] = FFMAX(prec->coord[1][0], band->coord[1][0]);
299     prec->coord[1][1] = FFMIN(prec->coord[1][1], band->coord[1][1]);
300 
301     prec->nb_codeblocks_width =
302         ff_jpeg2000_ceildivpow2(prec->coord[0][1],
303                                 band->log2_cblk_width)
304         - (prec->coord[0][0] >> band->log2_cblk_width);
305     prec->nb_codeblocks_height =
306         ff_jpeg2000_ceildivpow2(prec->coord[1][1],
307                                 band->log2_cblk_height)
308         - (prec->coord[1][0] >> band->log2_cblk_height);
309 
310 
311     /* Tag trees initialization */
312     prec->cblkincl =
313         ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,
314                                   prec->nb_codeblocks_height);
315     if (!prec->cblkincl)
316         return AVERROR(ENOMEM);
317 
318     prec->zerobits =
319         ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,
320                                   prec->nb_codeblocks_height);
321     if (!prec->zerobits)
322         return AVERROR(ENOMEM);
323 
324     if (prec->nb_codeblocks_width * (uint64_t)prec->nb_codeblocks_height > INT_MAX) {
325         prec->cblk = NULL;
326         return AVERROR(ENOMEM);
327     }
328     nb_codeblocks = prec->nb_codeblocks_width * prec->nb_codeblocks_height;
329     prec->cblk = av_mallocz_array(nb_codeblocks, sizeof(*prec->cblk));
330     if (!prec->cblk)
331         return AVERROR(ENOMEM);
332     for (cblkno = 0; cblkno < nb_codeblocks; cblkno++) {
333         Jpeg2000Cblk *cblk = prec->cblk + cblkno;
334         int Cx0, Cy0;
335 
336         /* Compute coordinates of codeblocks */
337         /* Compute Cx0*/
338         Cx0 = ((prec->coord[0][0]) >> band->log2_cblk_width) << band->log2_cblk_width;
339         Cx0 = Cx0 + ((cblkno % prec->nb_codeblocks_width)  << band->log2_cblk_width);
340         cblk->coord[0][0] = FFMAX(Cx0, prec->coord[0][0]);
341 
342         /* Compute Cy0*/
343         Cy0 = ((prec->coord[1][0]) >> band->log2_cblk_height) << band->log2_cblk_height;
344         Cy0 = Cy0 + ((cblkno / prec->nb_codeblocks_width)   << band->log2_cblk_height);
345         cblk->coord[1][0] = FFMAX(Cy0, prec->coord[1][0]);
346 
347         /* Compute Cx1 */
348         cblk->coord[0][1] = FFMIN(Cx0 + (1 << band->log2_cblk_width),
349                                   prec->coord[0][1]);
350 
351         /* Compute Cy1 */
352         cblk->coord[1][1] = FFMIN(Cy0 + (1 << band->log2_cblk_height),
353                                   prec->coord[1][1]);
354         /* Update code-blocks coordinates according sub-band position */
355         if ((bandno + !!reslevelno) & 1) {
356             cblk->coord[0][0] += comp->reslevel[reslevelno-1].coord[0][1] -
357                                  comp->reslevel[reslevelno-1].coord[0][0];
358             cblk->coord[0][1] += comp->reslevel[reslevelno-1].coord[0][1] -
359                                  comp->reslevel[reslevelno-1].coord[0][0];
360         }
361         if ((bandno + !!reslevelno) & 2) {
362             cblk->coord[1][0] += comp->reslevel[reslevelno-1].coord[1][1] -
363                                  comp->reslevel[reslevelno-1].coord[1][0];
364             cblk->coord[1][1] += comp->reslevel[reslevelno-1].coord[1][1] -
365                                  comp->reslevel[reslevelno-1].coord[1][0];
366         }
367 
368         cblk->lblock    = 3;
369         cblk->length    = 0;
370         cblk->npasses   = 0;
371         if (av_codec_is_encoder(avctx->codec)) {
372             cblk->layers = av_mallocz_array(codsty->nlayers, sizeof(*cblk->layers));
373             if (!cblk->layers)
374                 return AVERROR(ENOMEM);
375         }
376     }
377 
378     return 0;
379 }
380 
init_band(AVCodecContext * avctx,Jpeg2000ResLevel * reslevel,Jpeg2000Component * comp,Jpeg2000CodingStyle * codsty,Jpeg2000QuantStyle * qntsty,int bandno,int gbandno,int reslevelno,int cbps,int dx,int dy)381 static int init_band(AVCodecContext *avctx,
382                      Jpeg2000ResLevel *reslevel,
383                      Jpeg2000Component *comp,
384                      Jpeg2000CodingStyle *codsty,
385                      Jpeg2000QuantStyle *qntsty,
386                      int bandno, int gbandno, int reslevelno,
387                      int cbps, int dx, int dy)
388 {
389     Jpeg2000Band *band = reslevel->band + bandno;
390     uint8_t log2_band_prec_width, log2_band_prec_height;
391     int declvl = codsty->nreslevels - reslevelno;    // N_L -r see  ISO/IEC 15444-1:2002 B.5
392     int precno;
393     int nb_precincts;
394     int i, j, ret;
395 
396     init_band_stepsize(avctx, band, codsty, qntsty, bandno, gbandno, reslevelno, cbps);
397 
398     /* computation of tbx_0, tbx_1, tby_0, tby_1
399      * see ISO/IEC 15444-1:2002 B.5 eq. B-15 and tbl B.1
400      * codeblock width and height is computed for
401      * DCI JPEG 2000 codeblock_width = codeblock_width = 32 = 2 ^ 5 */
402     if (reslevelno == 0) {
403         /* for reslevelno = 0, only one band, x0_b = y0_b = 0 */
404         for (i = 0; i < 2; i++)
405             for (j = 0; j < 2; j++)
406                 band->coord[i][j] =
407                     ff_jpeg2000_ceildivpow2(comp->coord_o[i][j],
408                                             declvl - 1);
409         log2_band_prec_width  = reslevel->log2_prec_width;
410         log2_band_prec_height = reslevel->log2_prec_height;
411         /* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */
412         band->log2_cblk_width  = FFMIN(codsty->log2_cblk_width,
413                                        reslevel->log2_prec_width);
414         band->log2_cblk_height = FFMIN(codsty->log2_cblk_height,
415                                        reslevel->log2_prec_height);
416     } else {
417         /* 3 bands x0_b = 1 y0_b = 0; x0_b = 0 y0_b = 1; x0_b = y0_b = 1 */
418         /* x0_b and y0_b are computed with ((bandno + 1 >> i) & 1) */
419         for (i = 0; i < 2; i++)
420             for (j = 0; j < 2; j++)
421                 /* Formula example for tbx_0 = ceildiv((tcx_0 - 2 ^ (declvl - 1) * x0_b) / declvl) */
422                 band->coord[i][j] =
423                     ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] -
424                                             (((bandno + 1 >> i) & 1LL) << declvl - 1),
425                                             declvl);
426         /* TODO: Manage case of 3 band offsets here or
427          * in coding/decoding function? */
428 
429         /* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */
430         band->log2_cblk_width  = FFMIN(codsty->log2_cblk_width,
431                                        reslevel->log2_prec_width - 1);
432         band->log2_cblk_height = FFMIN(codsty->log2_cblk_height,
433                                        reslevel->log2_prec_height - 1);
434 
435         log2_band_prec_width  = reslevel->log2_prec_width  - 1;
436         log2_band_prec_height = reslevel->log2_prec_height - 1;
437     }
438 
439     if (reslevel->num_precincts_x * (uint64_t)reslevel->num_precincts_y > INT_MAX) {
440         band->prec = NULL;
441         return AVERROR(ENOMEM);
442     }
443     nb_precincts = reslevel->num_precincts_x * reslevel->num_precincts_y;
444     band->prec = av_mallocz_array(nb_precincts, sizeof(*band->prec));
445     if (!band->prec)
446         return AVERROR(ENOMEM);
447 
448     for (precno = 0; precno < nb_precincts; precno++) {
449         ret = init_prec(avctx, band, reslevel, comp, codsty,
450                         precno, bandno, reslevelno,
451                         log2_band_prec_width, log2_band_prec_height);
452         if (ret < 0)
453             return ret;
454     }
455 
456     return 0;
457 }
458 
ff_jpeg2000_init_component(Jpeg2000Component * comp,Jpeg2000CodingStyle * codsty,Jpeg2000QuantStyle * qntsty,int cbps,int dx,int dy,AVCodecContext * avctx)459 int ff_jpeg2000_init_component(Jpeg2000Component *comp,
460                                Jpeg2000CodingStyle *codsty,
461                                Jpeg2000QuantStyle *qntsty,
462                                int cbps, int dx, int dy,
463                                AVCodecContext *avctx)
464 {
465     int reslevelno, bandno, gbandno = 0, ret, i, j;
466     uint32_t csize;
467 
468     if (codsty->nreslevels2decode <= 0) {
469         av_log(avctx, AV_LOG_ERROR, "nreslevels2decode %d invalid or uninitialized\n", codsty->nreslevels2decode);
470         return AVERROR_INVALIDDATA;
471     }
472 
473     if (ret = ff_jpeg2000_dwt_init(&comp->dwt, comp->coord,
474                                    codsty->nreslevels2decode - 1,
475                                    codsty->transform))
476         return ret;
477 
478     if (av_image_check_size(comp->coord[0][1] - comp->coord[0][0],
479                             comp->coord[1][1] - comp->coord[1][0], 0, avctx))
480         return AVERROR_INVALIDDATA;
481     csize = (comp->coord[0][1] - comp->coord[0][0]) *
482             (comp->coord[1][1] - comp->coord[1][0]);
483     if (comp->coord[0][1] - comp->coord[0][0] > 32768 ||
484         comp->coord[1][1] - comp->coord[1][0] > 32768) {
485         av_log(avctx, AV_LOG_ERROR, "component size too large\n");
486         return AVERROR_PATCHWELCOME;
487     }
488 
489     if (codsty->transform == FF_DWT97) {
490         csize += AV_INPUT_BUFFER_PADDING_SIZE / sizeof(*comp->f_data);
491         comp->i_data = NULL;
492         comp->f_data = av_mallocz_array(csize, sizeof(*comp->f_data));
493         if (!comp->f_data)
494             return AVERROR(ENOMEM);
495     } else {
496         csize += AV_INPUT_BUFFER_PADDING_SIZE / sizeof(*comp->i_data);
497         comp->f_data = NULL;
498         comp->i_data = av_mallocz_array(csize, sizeof(*comp->i_data));
499         if (!comp->i_data)
500             return AVERROR(ENOMEM);
501     }
502     comp->reslevel = av_mallocz_array(codsty->nreslevels, sizeof(*comp->reslevel));
503     if (!comp->reslevel)
504         return AVERROR(ENOMEM);
505     /* LOOP on resolution levels */
506     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
507         int declvl = codsty->nreslevels - reslevelno;    // N_L -r see  ISO/IEC 15444-1:2002 B.5
508         Jpeg2000ResLevel *reslevel = comp->reslevel + reslevelno;
509 
510         /* Compute borders for each resolution level.
511          * Computation of trx_0, trx_1, try_0 and try_1.
512          * see ISO/IEC 15444-1:2002 eq. B.5 and B-14 */
513         for (i = 0; i < 2; i++)
514             for (j = 0; j < 2; j++)
515                 reslevel->coord[i][j] =
516                     ff_jpeg2000_ceildivpow2(comp->coord_o[i][j], declvl - 1);
517         // update precincts size: 2^n value
518         reslevel->log2_prec_width  = codsty->log2_prec_widths[reslevelno];
519         reslevel->log2_prec_height = codsty->log2_prec_heights[reslevelno];
520 
521         /* Number of bands for each resolution level */
522         if (reslevelno == 0)
523             reslevel->nbands = 1;
524         else
525             reslevel->nbands = 3;
526 
527         /* Number of precincts which span the tile for resolution level reslevelno
528          * see B.6 in ISO/IEC 15444-1:2002 eq. B-16
529          * num_precincts_x = |- trx_1 / 2 ^ log2_prec_width) -| - (trx_0 / 2 ^ log2_prec_width)
530          * num_precincts_y = |- try_1 / 2 ^ log2_prec_width) -| - (try_0 / 2 ^ log2_prec_width)
531          * for Dcinema profiles in JPEG 2000
532          * num_precincts_x = |- trx_1 / 2 ^ log2_prec_width) -|
533          * num_precincts_y = |- try_1 / 2 ^ log2_prec_width) -| */
534         if (reslevel->coord[0][1] == reslevel->coord[0][0])
535             reslevel->num_precincts_x = 0;
536         else
537             reslevel->num_precincts_x =
538                 ff_jpeg2000_ceildivpow2(reslevel->coord[0][1],
539                                         reslevel->log2_prec_width) -
540                 (reslevel->coord[0][0] >> reslevel->log2_prec_width);
541 
542         if (reslevel->coord[1][1] == reslevel->coord[1][0])
543             reslevel->num_precincts_y = 0;
544         else
545             reslevel->num_precincts_y =
546                 ff_jpeg2000_ceildivpow2(reslevel->coord[1][1],
547                                         reslevel->log2_prec_height) -
548                 (reslevel->coord[1][0] >> reslevel->log2_prec_height);
549 
550         reslevel->band = av_mallocz_array(reslevel->nbands, sizeof(*reslevel->band));
551         if (!reslevel->band)
552             return AVERROR(ENOMEM);
553 
554         if (reslevel->num_precincts_x * (uint64_t)reslevel->num_precincts_y * reslevel->nbands > avctx->max_pixels / sizeof(*reslevel->band->prec))
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 
ff_jpeg2000_reinit(Jpeg2000Component * comp,Jpeg2000CodingStyle * codsty)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                 ff_tag_tree_zero(prec->zerobits, prec->nb_codeblocks_width, prec->nb_codeblocks_height, 0);
579                 ff_tag_tree_zero(prec->cblkincl, prec->nb_codeblocks_width, prec->nb_codeblocks_height, 0);
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 
ff_jpeg2000_cleanup(Jpeg2000Component * comp,Jpeg2000CodingStyle * codsty)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                     int nb_code_blocks = prec->nb_codeblocks_height * prec->nb_codeblocks_width;
613 
614                     av_freep(&prec->zerobits);
615                     av_freep(&prec->cblkincl);
616                     if (prec->cblk) {
617                         int cblkno;
618                         for (cblkno = 0; cblkno < nb_code_blocks; cblkno ++) {
619                             Jpeg2000Cblk *cblk = &prec->cblk[cblkno];
620                             av_freep(&cblk->data);
621                             av_freep(&cblk->passes);
622                             av_freep(&cblk->lengthinc);
623                             av_freep(&cblk->data_start);
624                             av_freep(&cblk->layers);
625                         }
626                         av_freep(&prec->cblk);
627                     }
628                 }
629             }
630 
631             av_freep(&band->prec);
632         }
633         av_freep(&reslevel->band);
634     }
635 
636     ff_dwt_destroy(&comp->dwt);
637     av_freep(&comp->reslevel);
638     av_freep(&comp->i_data);
639     av_freep(&comp->f_data);
640 }
641