1b409121526fca7f9f1a9bc59c10a409fea29282
[libav.git] / libavcodec / jpeg2000dec.c
1 /*
2 * JPEG 2000 image decoder
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 decoder
26 */
27
28 #include "libavutil/common.h"
29 #include "libavutil/opt.h"
30 #include "avcodec.h"
31 #include "bytestream.h"
32 #include "internal.h"
33 #include "thread.h"
34 #include "jpeg2000.h"
35
36 #define JP2_SIG_TYPE 0x6A502020
37 #define JP2_SIG_VALUE 0x0D0A870A
38 #define JP2_CODESTREAM 0x6A703263
39
40 #define HAD_COC 0x01
41 #define HAD_QCC 0x02
42
43 typedef struct Jpeg2000TilePart {
44 uint16_t tp_idx; // Tile-part index
45 uint8_t tile_index; // Tile index who refers the tile-part
46 uint32_t tp_len; // Length of tile-part
47 GetByteContext tpg; // bit stream in tile-part
48 } Jpeg2000TilePart;
49
50 /* RMK: For JPEG2000 DCINEMA 3 tile-parts in a tile
51 * one per component, so tile_part elements have a size of 3 */
52 typedef struct Jpeg2000Tile {
53 Jpeg2000Component *comp;
54 uint8_t properties[4];
55 Jpeg2000CodingStyle codsty[4];
56 Jpeg2000QuantStyle qntsty[4];
57 Jpeg2000TilePart tile_part[3];
58 } Jpeg2000Tile;
59
60 typedef struct Jpeg2000DecoderContext {
61 AVClass *class;
62 AVCodecContext *avctx;
63 GetByteContext g;
64
65 int width, height;
66 int image_offset_x, image_offset_y;
67 int tile_offset_x, tile_offset_y;
68 uint8_t cbps[4]; // bits per sample in particular components
69 uint8_t sgnd[4]; // if a component is signed
70 uint8_t properties[4];
71 int cdx[4], cdy[4];
72 int precision;
73 int ncomponents;
74 int tile_width, tile_height;
75 unsigned numXtiles, numYtiles;
76 int maxtilelen;
77
78 Jpeg2000CodingStyle codsty[4];
79 Jpeg2000QuantStyle qntsty[4];
80
81 int bit_index;
82
83 int16_t curtileno;
84 Jpeg2000Tile *tile;
85
86 /*options parameters*/
87 int16_t lowres;
88 int16_t reduction_factor;
89 } Jpeg2000DecoderContext;
90
91 /* get_bits functions for JPEG2000 packet bitstream
92 * It is a get_bit function with a bit-stuffing routine. If the value of the
93 * byte is 0xFF, the next byte includes an extra zero bit stuffed into the MSB.
94 * cf. ISO-15444-1:2002 / B.10.1 Bit-stuffing routine */
95 static int get_bits(Jpeg2000DecoderContext *s, int n)
96 {
97 int res = 0;
98 while (--n >= 0) {
99 res <<= 1;
100 if (s->bit_index == 0) {
101 s->bit_index = 7 + (bytestream2_get_byte(&s->g) != 0xFFu);
102 }
103 s->bit_index--;
104 res |= (bytestream2_peek_byte(&s->g) >> s->bit_index) & 1;
105 }
106 return res;
107 }
108
109 static void jpeg2000_flush(Jpeg2000DecoderContext *s)
110 {
111 if (bytestream2_get_byte(&s->g) == 0xff)
112 bytestream2_skip(&s->g, 1);
113 s->bit_index = 8;
114 }
115
116 /* decode the value stored in node */
117 static int tag_tree_decode(Jpeg2000DecoderContext *s, Jpeg2000TgtNode *node,
118 int threshold)
119 {
120 Jpeg2000TgtNode *stack[30];
121 int sp = -1, curval = 0;
122
123 while (node && !node->vis) {
124 stack[++sp] = node;
125 node = node->parent;
126 }
127
128 if (node)
129 curval = node->val;
130 else
131 curval = stack[sp]->val;
132
133 while (curval < threshold && sp >= 0) {
134 if (curval < stack[sp]->val)
135 curval = stack[sp]->val;
136 while (curval < threshold) {
137 int ret;
138 if ((ret = get_bits(s, 1)) > 0) {
139 stack[sp]->vis++;
140 break;
141 } else if (!ret)
142 curval++;
143 else
144 return ret;
145 }
146 stack[sp]->val = curval;
147 sp--;
148 }
149 return curval;
150 }
151
152 /* marker segments */
153 /* get sizes and offsets of image, tiles; number of components */
154 static int get_siz(Jpeg2000DecoderContext *s)
155 {
156 int i;
157 int ncomponents;
158
159 if (bytestream2_get_bytes_left(&s->g) < 36)
160 return AVERROR_INVALIDDATA;
161
162 s->avctx->profile = bytestream2_get_be16u(&s->g); // Rsiz
163 s->width = bytestream2_get_be32u(&s->g); // Width
164 s->height = bytestream2_get_be32u(&s->g); // Height
165 s->image_offset_x = bytestream2_get_be32u(&s->g); // X0Siz
166 s->image_offset_y = bytestream2_get_be32u(&s->g); // Y0Siz
167 s->tile_width = bytestream2_get_be32u(&s->g); // XTSiz
168 s->tile_height = bytestream2_get_be32u(&s->g); // YTSiz
169 s->tile_offset_x = bytestream2_get_be32u(&s->g); // XT0Siz
170 s->tile_offset_y = bytestream2_get_be32u(&s->g); // YT0Siz
171 ncomponents = bytestream2_get_be16u(&s->g); // CSiz
172
173 if (ncomponents <= 0) {
174 av_log(s->avctx, AV_LOG_ERROR, "Invalid number of components: %d\n",
175 s->ncomponents);
176 return AVERROR_INVALIDDATA;
177 }
178
179 if (ncomponents > 3) {
180 avpriv_request_sample(s->avctx, "Support for %d components",
181 s->ncomponents);
182 return AVERROR_PATCHWELCOME;
183 }
184
185 s->ncomponents = ncomponents;
186
187 if (s->tile_width <= 0 || s->tile_height <= 0 ||
188 s->tile_width > s->width || s->tile_height > s->height) {
189 av_log(s->avctx, AV_LOG_ERROR, "Invalid tile dimension %dx%d.\n",
190 s->tile_width, s->tile_height);
191 return AVERROR_INVALIDDATA;
192 }
193
194 if (bytestream2_get_bytes_left(&s->g) < 3 * s->ncomponents)
195 return AVERROR_INVALIDDATA;
196
197 for (i = 0; i < s->ncomponents; i++) { // Ssiz_i XRsiz_i, YRsiz_i
198 uint8_t x = bytestream2_get_byteu(&s->g);
199 s->cbps[i] = (x & 0x7f) + 1;
200 s->precision = FFMAX(s->cbps[i], s->precision);
201 s->sgnd[i] = !!(x & 0x80);
202 s->cdx[i] = bytestream2_get_byteu(&s->g);
203 s->cdy[i] = bytestream2_get_byteu(&s->g);
204
205 if (s->cdx[i] != 1 || s->cdy[i] != 1) {
206 avpriv_request_sample(s->avctx,
207 "CDxy values %d %d for component %d",
208 s->cdx[i], s->cdy[i], i);
209 if (!s->cdx[i] || !s->cdy[i])
210 return AVERROR_INVALIDDATA;
211 else
212 return AVERROR_PATCHWELCOME;
213 }
214 }
215
216 s->numXtiles = ff_jpeg2000_ceildiv(s->width - s->tile_offset_x, s->tile_width);
217 s->numYtiles = ff_jpeg2000_ceildiv(s->height - s->tile_offset_y, s->tile_height);
218
219 s->tile = av_mallocz_array(s->numXtiles * s->numYtiles, sizeof(*s->tile));
220 if (!s->tile) {
221 s->numXtiles = s->numYtiles = 0;
222 return AVERROR(ENOMEM);
223 }
224
225 for (i = 0; i < s->numXtiles * s->numYtiles; i++) {
226 Jpeg2000Tile *tile = s->tile + i;
227
228 tile->comp = av_mallocz(s->ncomponents * sizeof(*tile->comp));
229 if (!tile->comp)
230 return AVERROR(ENOMEM);
231 }
232
233 /* compute image size with reduction factor */
234 s->avctx->width = ff_jpeg2000_ceildivpow2(s->width - s->image_offset_x,
235 s->reduction_factor);
236 s->avctx->height = ff_jpeg2000_ceildivpow2(s->height - s->image_offset_y,
237 s->reduction_factor);
238
239 switch (s->avctx->profile) {
240 case FF_PROFILE_JPEG2000_DCINEMA_2K:
241 case FF_PROFILE_JPEG2000_DCINEMA_4K:
242 /* XYZ color-space for digital cinema profiles */
243 s->avctx->pix_fmt = AV_PIX_FMT_XYZ12;
244 break;
245 default:
246 /* For other profiles selects color-space according number of
247 * components and bit depth precision. */
248 switch (s->ncomponents) {
249 case 1:
250 if (s->precision > 8)
251 s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
252 else
253 s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
254 break;
255 case 3:
256 if (s->precision > 8)
257 s->avctx->pix_fmt = AV_PIX_FMT_RGB48;
258 else
259 s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
260 break;
261 case 4:
262 s->avctx->pix_fmt = AV_PIX_FMT_BGRA;
263 break;
264 default:
265 /* pixel format can not be identified */
266 s->avctx->pix_fmt = AV_PIX_FMT_NONE;
267 break;
268 }
269 break;
270 }
271 return 0;
272 }
273
274 /* get common part for COD and COC segments */
275 static int get_cox(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c)
276 {
277 uint8_t byte;
278
279 if (bytestream2_get_bytes_left(&s->g) < 5)
280 return AVERROR_INVALIDDATA;
281
282 /* nreslevels = number of resolution levels
283 = number of decomposition level +1 */
284 c->nreslevels = bytestream2_get_byteu(&s->g) + 1;
285
286 if (c->nreslevels > JPEG2000_MAX_RESLEVELS)
287 return AVERROR_INVALIDDATA;
288
289 /* compute number of resolution levels to decode */
290 if (c->nreslevels < s->reduction_factor)
291 c->nreslevels2decode = 1;
292 else
293 c->nreslevels2decode = c->nreslevels - s->reduction_factor;
294
295 c->log2_cblk_width = bytestream2_get_byteu(&s->g) + 2; // cblk width
296 c->log2_cblk_height = bytestream2_get_byteu(&s->g) + 2; // cblk height
297
298 if (c->log2_cblk_width > 10 || c->log2_cblk_height > 10 ||
299 c->log2_cblk_width + c->log2_cblk_height > 12) {
300 av_log(s->avctx, AV_LOG_ERROR, "cblk size invalid\n");
301 return AVERROR_INVALIDDATA;
302 }
303
304 c->cblk_style = bytestream2_get_byteu(&s->g);
305 if (c->cblk_style != 0) { // cblk style
306 avpriv_request_sample(s->avctx, "Support for extra cblk styles");
307 return AVERROR_PATCHWELCOME;
308 }
309 c->transform = bytestream2_get_byteu(&s->g); // DWT transformation type
310 /* set integer 9/7 DWT in case of BITEXACT flag */
311 if ((s->avctx->flags & CODEC_FLAG_BITEXACT) && (c->transform == FF_DWT97))
312 c->transform = FF_DWT97_INT;
313
314 if (c->csty & JPEG2000_CSTY_PREC) {
315 int i;
316 for (i = 0; i < c->nreslevels; i++) {
317 byte = bytestream2_get_byte(&s->g);
318 c->log2_prec_widths[i] = byte & 0x0F; // precinct PPx
319 c->log2_prec_heights[i] = (byte >> 4) & 0x0F; // precinct PPy
320 }
321 } else {
322 memset(c->log2_prec_widths , 15, sizeof(c->log2_prec_widths ));
323 memset(c->log2_prec_heights, 15, sizeof(c->log2_prec_heights));
324 }
325 return 0;
326 }
327
328 /* get coding parameters for a particular tile or whole image*/
329 static int get_cod(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
330 uint8_t *properties)
331 {
332 Jpeg2000CodingStyle tmp;
333 int compno, ret;
334
335 if (bytestream2_get_bytes_left(&s->g) < 5)
336 return AVERROR_INVALIDDATA;
337
338 tmp.csty = bytestream2_get_byteu(&s->g);
339
340 // get progression order
341 tmp.prog_order = bytestream2_get_byteu(&s->g);
342
343 tmp.nlayers = bytestream2_get_be16u(&s->g);
344 tmp.mct = bytestream2_get_byteu(&s->g); // multiple component transformation
345
346 if ((ret = get_cox(s, &tmp)) < 0)
347 return ret;
348
349 for (compno = 0; compno < s->ncomponents; compno++)
350 if (!(properties[compno] & HAD_COC))
351 memcpy(c + compno, &tmp, sizeof(tmp));
352 return 0;
353 }
354
355 /* Get coding parameters for a component in the whole image or a
356 * particular tile. */
357 static int get_coc(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
358 uint8_t *properties)
359 {
360 int compno, ret;
361
362 if (bytestream2_get_bytes_left(&s->g) < 2)
363 return AVERROR_INVALIDDATA;
364
365 compno = bytestream2_get_byteu(&s->g);
366
367 if (compno >= s->ncomponents) {
368 av_log(s->avctx, AV_LOG_ERROR,
369 "Invalid compno %d. There are %d components in the image.\n",
370 compno, s->ncomponents);
371 return AVERROR_INVALIDDATA;
372 }
373
374 c += compno;
375 c->csty = bytestream2_get_byteu(&s->g);
376
377 if ((ret = get_cox(s, c)) < 0)
378 return ret;
379
380 properties[compno] |= HAD_COC;
381 return 0;
382 }
383
384 /* Get common part for QCD and QCC segments. */
385 static int get_qcx(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q)
386 {
387 int i, x;
388
389 if (bytestream2_get_bytes_left(&s->g) < 1)
390 return AVERROR_INVALIDDATA;
391
392 x = bytestream2_get_byteu(&s->g); // Sqcd
393
394 q->nguardbits = x >> 5;
395 q->quantsty = x & 0x1f;
396
397 if (q->quantsty == JPEG2000_QSTY_NONE) {
398 n -= 3;
399 if (bytestream2_get_bytes_left(&s->g) < n ||
400 n > JPEG2000_MAX_DECLEVELS)
401 return AVERROR_INVALIDDATA;
402 for (i = 0; i < n; i++)
403 q->expn[i] = bytestream2_get_byteu(&s->g) >> 3;
404 } else if (q->quantsty == JPEG2000_QSTY_SI) {
405 if (bytestream2_get_bytes_left(&s->g) < 2)
406 return AVERROR_INVALIDDATA;
407 x = bytestream2_get_be16u(&s->g);
408 q->expn[0] = x >> 11;
409 q->mant[0] = x & 0x7ff;
410 for (i = 1; i < JPEG2000_MAX_DECLEVELS * 3; i++) {
411 int curexpn = FFMAX(0, q->expn[0] - (i - 1) / 3);
412 q->expn[i] = curexpn;
413 q->mant[i] = q->mant[0];
414 }
415 } else {
416 n = (n - 3) >> 1;
417 if (bytestream2_get_bytes_left(&s->g) < 2 * n ||
418 n > JPEG2000_MAX_DECLEVELS)
419 return AVERROR_INVALIDDATA;
420 for (i = 0; i < n; i++) {
421 x = bytestream2_get_be16u(&s->g);
422 q->expn[i] = x >> 11;
423 q->mant[i] = x & 0x7ff;
424 }
425 }
426 return 0;
427 }
428
429 /* Get quantization parameters for a particular tile or a whole image. */
430 static int get_qcd(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
431 uint8_t *properties)
432 {
433 Jpeg2000QuantStyle tmp;
434 int compno, ret;
435
436 if ((ret = get_qcx(s, n, &tmp)) < 0)
437 return ret;
438 for (compno = 0; compno < s->ncomponents; compno++)
439 if (!(properties[compno] & HAD_QCC))
440 memcpy(q + compno, &tmp, sizeof(tmp));
441 return 0;
442 }
443
444 /* Get quantization parameters for a component in the whole image
445 * on in a particular tile. */
446 static int get_qcc(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
447 uint8_t *properties)
448 {
449 int compno;
450
451 if (bytestream2_get_bytes_left(&s->g) < 1)
452 return AVERROR_INVALIDDATA;
453
454 compno = bytestream2_get_byteu(&s->g);
455
456 if (compno >= s->ncomponents) {
457 av_log(s->avctx, AV_LOG_ERROR,
458 "Invalid compno %d. There are %d components in the image.\n",
459 compno, s->ncomponents);
460 return AVERROR_INVALIDDATA;
461 }
462
463 properties[compno] |= HAD_QCC;
464 return get_qcx(s, n - 1, q + compno);
465 }
466
467 /* Get start of tile segment. */
468 static int get_sot(Jpeg2000DecoderContext *s, int n)
469 {
470 Jpeg2000TilePart *tp;
471 uint16_t Isot;
472 uint32_t Psot;
473 uint8_t TPsot;
474
475 if (bytestream2_get_bytes_left(&s->g) < 8)
476 return AVERROR_INVALIDDATA;
477
478 Isot = bytestream2_get_be16u(&s->g); // Isot
479 if (Isot >= s->numXtiles * s->numYtiles)
480 return AVERROR_INVALIDDATA;
481
482 if (Isot) {
483 avpriv_request_sample(s->avctx, "Support for more than one tile");
484 return AVERROR_PATCHWELCOME;
485 }
486 Psot = bytestream2_get_be32u(&s->g); // Psot
487 TPsot = bytestream2_get_byteu(&s->g); // TPsot
488
489 /* Read TNSot but not used */
490 bytestream2_get_byteu(&s->g); // TNsot
491
492 if (Psot > bytestream2_get_bytes_left(&s->g) + n + 2) {
493 av_log(s->avctx, AV_LOG_ERROR, "Psot %d too big\n", Psot);
494 return AVERROR_INVALIDDATA;
495 }
496
497 if (TPsot >= FF_ARRAY_ELEMS(s->tile[Isot].tile_part)) {
498 avpriv_request_sample(s->avctx, "Support for %d components", TPsot);
499 return AVERROR_PATCHWELCOME;
500 }
501
502 tp = s->tile[s->curtileno].tile_part + TPsot;
503 tp->tile_index = Isot;
504 tp->tp_len = Psot;
505 tp->tp_idx = TPsot;
506
507 /* Start of bit stream. Pointer to SOD marker
508 * Check SOD marker is present. */
509 if (JPEG2000_SOD == bytestream2_get_be16(&s->g)) {
510 bytestream2_init(&tp->tpg, s->g.buffer, tp->tp_len - n - 4);
511 bytestream2_skip(&s->g, tp->tp_len - n - 4);
512 } else {
513 av_log(s->avctx, AV_LOG_ERROR, "SOD marker not found \n");
514 return AVERROR_INVALIDDATA;
515 }
516
517 /* End address of bit stream =
518 * start address + (Psot - size of SOT HEADER(n)
519 * - size of SOT MARKER(2) - size of SOD marker(2) */
520
521 return 0;
522 }
523
524 /* Tile-part lengths: see ISO 15444-1:2002, section A.7.1
525 * Used to know the number of tile parts and lengths.
526 * There may be multiple TLMs in the header.
527 * TODO: The function is not used for tile-parts management, nor anywhere else.
528 * It can be useful to allocate memory for tile parts, before managing the SOT
529 * markers. Parsing the TLM header is needed to increment the input header
530 * buffer.
531 * This marker is mandatory for DCI. */
532 static uint8_t get_tlm(Jpeg2000DecoderContext *s, int n)
533 {
534 uint8_t Stlm, ST, SP, tile_tlm, i;
535 bytestream2_get_byte(&s->g); /* Ztlm: skipped */
536 Stlm = bytestream2_get_byte(&s->g);
537
538 // too complex ? ST = ((Stlm >> 4) & 0x01) + ((Stlm >> 4) & 0x02);
539 ST = (Stlm >> 4) & 0x03;
540 // TODO: Manage case of ST = 0b11 --> raise error
541 SP = (Stlm >> 6) & 0x01;
542 tile_tlm = (n - 4) / ((SP + 1) * 2 + ST);
543 for (i = 0; i < tile_tlm; i++) {
544 switch (ST) {
545 case 0:
546 break;
547 case 1:
548 bytestream2_get_byte(&s->g);
549 break;
550 case 2:
551 bytestream2_get_be16(&s->g);
552 break;
553 case 3:
554 bytestream2_get_be32(&s->g);
555 break;
556 }
557 if (SP == 0) {
558 bytestream2_get_be16(&s->g);
559 } else {
560 bytestream2_get_be32(&s->g);
561 }
562 }
563 return 0;
564 }
565
566 static int init_tile(Jpeg2000DecoderContext *s, int tileno)
567 {
568 int compno;
569 int tilex = tileno % s->numXtiles;
570 int tiley = tileno / s->numXtiles;
571 Jpeg2000Tile *tile = s->tile + tileno;
572 Jpeg2000CodingStyle *codsty;
573 Jpeg2000QuantStyle *qntsty;
574
575 if (!tile->comp)
576 return AVERROR(ENOMEM);
577
578 /* copy codsty, qnsty to tile. TODO: Is it the best way?
579 * codsty, qnsty is an array of 4 structs Jpeg2000CodingStyle
580 * and Jpeg2000QuantStyle */
581 memcpy(tile->codsty, s->codsty, s->ncomponents * sizeof(*codsty));
582 memcpy(tile->qntsty, s->qntsty, s->ncomponents * sizeof(*qntsty));
583
584 for (compno = 0; compno < s->ncomponents; compno++) {
585 Jpeg2000Component *comp = tile->comp + compno;
586 int ret; // global bandno
587 codsty = tile->codsty + compno;
588 qntsty = tile->qntsty + compno;
589
590 comp->coord_o[0][0] = FFMAX(tilex * s->tile_width + s->tile_offset_x, s->image_offset_x);
591 comp->coord_o[0][1] = FFMIN((tilex + 1) * s->tile_width + s->tile_offset_x, s->width);
592 comp->coord_o[1][0] = FFMAX(tiley * s->tile_height + s->tile_offset_y, s->image_offset_y);
593 comp->coord_o[1][1] = FFMIN((tiley + 1) * s->tile_height + s->tile_offset_y, s->height);
594
595 // FIXME: add a dcinema profile check ?
596 // value is guaranteed by profile (orig=0, 1 tile)
597 comp->coord[0][0] = 0;
598 comp->coord[0][1] = s->avctx->width;
599 comp->coord[1][0] = 0;
600 comp->coord[1][1] = s->avctx->height;
601
602 if (ret = ff_jpeg2000_init_component(comp, codsty, qntsty,
603 s->cbps[compno], s->cdx[compno],
604 s->cdy[compno], s->avctx))
605 return ret;
606 }
607 return 0;
608 }
609
610 /* Read the number of coding passes. */
611 static int getnpasses(Jpeg2000DecoderContext *s)
612 {
613 int num;
614 if (!get_bits(s, 1))
615 return 1;
616 if (!get_bits(s, 1))
617 return 2;
618 if ((num = get_bits(s, 2)) != 3)
619 return num < 0 ? num : 3 + num;
620 if ((num = get_bits(s, 5)) != 31)
621 return num < 0 ? num : 6 + num;
622 num = get_bits(s, 7);
623 return num < 0 ? num : 37 + num;
624 }
625
626 static int getlblockinc(Jpeg2000DecoderContext *s)
627 {
628 int res = 0, ret;
629 while (ret = get_bits(s, 1)) {
630 if (ret < 0)
631 return ret;
632 res++;
633 }
634 return res;
635 }
636
637 static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s,
638 Jpeg2000CodingStyle *codsty,
639 Jpeg2000ResLevel *rlevel, int precno,
640 int layno, uint8_t *expn, int numgbits)
641 {
642 int bandno, cblkno, ret, nb_code_blocks;
643
644 if (!(ret = get_bits(s, 1))) {
645 jpeg2000_flush(s);
646 return 0;
647 } else if (ret < 0)
648 return ret;
649
650 for (bandno = 0; bandno < rlevel->nbands; bandno++) {
651 Jpeg2000Band *band = rlevel->band + bandno;
652 Jpeg2000Prec *prec = band->prec + precno;
653
654 if (band->coord[0][0] == band->coord[0][1] ||
655 band->coord[1][0] == band->coord[1][1])
656 continue;
657 nb_code_blocks = prec->nb_codeblocks_height *
658 prec->nb_codeblocks_width;
659 for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
660 Jpeg2000Cblk *cblk = prec->cblk + cblkno;
661 int incl, newpasses, llen;
662
663 if (cblk->npasses)
664 incl = get_bits(s, 1);
665 else
666 incl = tag_tree_decode(s, prec->cblkincl + cblkno, layno + 1) == layno;
667 if (!incl)
668 continue;
669 else if (incl < 0)
670 return incl;
671
672 if (!cblk->npasses) {
673 int v = expn[bandno] + numgbits - 1 -
674 tag_tree_decode(s, prec->zerobits + cblkno, 100);
675 if (v < 0) {
676 av_log(s->avctx, AV_LOG_ERROR,
677 "nonzerobits %d invalid\n", v);
678 return AVERROR_INVALIDDATA;
679 }
680 cblk->nonzerobits = v;
681 }
682 if ((newpasses = getnpasses(s)) < 0)
683 return newpasses;
684 if ((llen = getlblockinc(s)) < 0)
685 return llen;
686 cblk->lblock += llen;
687 if ((ret = get_bits(s, av_log2(newpasses) + cblk->lblock)) < 0)
688 return ret;
689 if (ret > sizeof(cblk->data)) {
690 avpriv_request_sample(s->avctx,
691 "Block with lengthinc greater than %zu",
692 sizeof(cblk->data));
693 return AVERROR_PATCHWELCOME;
694 }
695 cblk->lengthinc = ret;
696 cblk->npasses += newpasses;
697 }
698 }
699 jpeg2000_flush(s);
700
701 if (codsty->csty & JPEG2000_CSTY_EPH) {
702 if (bytestream2_peek_be16(&s->g) == JPEG2000_EPH)
703 bytestream2_skip(&s->g, 2);
704 else
705 av_log(s->avctx, AV_LOG_ERROR, "EPH marker not found.\n");
706 }
707
708 for (bandno = 0; bandno < rlevel->nbands; bandno++) {
709 Jpeg2000Band *band = rlevel->band + bandno;
710 Jpeg2000Prec *prec = band->prec + precno;
711
712 nb_code_blocks = prec->nb_codeblocks_height * prec->nb_codeblocks_width;
713 for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
714 Jpeg2000Cblk *cblk = prec->cblk + cblkno;
715 if (bytestream2_get_bytes_left(&s->g) < cblk->lengthinc)
716 return AVERROR_INVALIDDATA;
717 /* Code-block data can be empty. In that case initialize data
718 * with 0xFFFF. */
719 if (cblk->lengthinc > 0) {
720 bytestream2_get_bufferu(&s->g, cblk->data, cblk->lengthinc);
721 } else {
722 cblk->data[0] = 0xFF;
723 cblk->data[1] = 0xFF;
724 }
725 cblk->length += cblk->lengthinc;
726 cblk->lengthinc = 0;
727 }
728 }
729 return 0;
730 }
731
732 static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
733 {
734 int layno, reslevelno, compno, precno, ok_reslevel, ret;
735 uint8_t prog_order = tile->codsty[0].prog_order;
736 uint16_t x;
737 uint16_t y;
738
739 s->bit_index = 8;
740 switch (prog_order) {
741 case JPEG2000_PGOD_LRCP:
742 for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
743 ok_reslevel = 1;
744 for (reslevelno = 0; ok_reslevel; reslevelno++) {
745 ok_reslevel = 0;
746 for (compno = 0; compno < s->ncomponents; compno++) {
747 Jpeg2000CodingStyle *codsty = tile->codsty + compno;
748 Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
749 if (reslevelno < codsty->nreslevels) {
750 Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel +
751 reslevelno;
752 ok_reslevel = 1;
753 for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++)
754 if ((ret = jpeg2000_decode_packet(s,
755 codsty, rlevel,
756 precno, layno,
757 qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
758 qntsty->nguardbits)) < 0)
759 return ret;
760 }
761 }
762 }
763 }
764 break;
765
766 case JPEG2000_PGOD_CPRL:
767 for (compno = 0; compno < s->ncomponents; compno++) {
768 Jpeg2000CodingStyle *codsty = tile->codsty + compno;
769 Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
770
771 /* Set bit stream buffer address according to tile-part.
772 * For DCinema one tile-part per component, so can be
773 * indexed by component. */
774 s->g = tile->tile_part[compno].tpg;
775
776 /* Position loop (y axis)
777 * TODO: Automate computing of step 256.
778 * Fixed here, but to be computed before entering here. */
779 for (y = 0; y < s->height; y += 256) {
780 /* Position loop (y axis)
781 * TODO: automate computing of step 256.
782 * Fixed here, but to be computed before entering here. */
783 for (x = 0; x < s->width; x += 256) {
784 for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
785 uint16_t prcx, prcy;
786 uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; // ==> N_L - r
787 Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel + reslevelno;
788
789 if (!((y % (1 << (rlevel->log2_prec_height + reducedresno)) == 0) ||
790 (y == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
791 continue;
792
793 if (!((x % (1 << (rlevel->log2_prec_width + reducedresno)) == 0) ||
794 (x == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
795 continue;
796
797 // check if a precinct exists
798 prcx = ff_jpeg2000_ceildivpow2(x, reducedresno) >> rlevel->log2_prec_width;
799 prcy = ff_jpeg2000_ceildivpow2(y, reducedresno) >> rlevel->log2_prec_height;
800 precno = prcx + rlevel->num_precincts_x * prcy;
801 for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
802 if ((ret = jpeg2000_decode_packet(s, codsty, rlevel,
803 precno, layno,
804 qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
805 qntsty->nguardbits)) < 0)
806 return ret;
807 }
808 }
809 }
810 }
811 }
812 break;
813
814 default:
815 break;
816 }
817
818 /* EOC marker reached */
819 bytestream2_skip(&s->g, 2);
820
821 return 0;
822 }
823
824 /* TIER-1 routines */
825 static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height,
826 int bpno, int bandno)
827 {
828 int mask = 3 << (bpno - 1), y0, x, y;
829
830 for (y0 = 0; y0 < height; y0 += 4)
831 for (x = 0; x < width; x++)
832 for (y = y0; y < height && y < y0 + 4; y++)
833 if ((t1->flags[y + 1][x + 1] & JPEG2000_T1_SIG_NB)
834 && !(t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {
835 if (ff_mqc_decode(&t1->mqc,
836 t1->mqc.cx_states +
837 ff_jpeg2000_getsigctxno(t1->flags[y + 1][x + 1],
838 bandno))) {
839 int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1],
840 &xorbit);
841
842 t1->data[y][x] =
843 (ff_mqc_decode(&t1->mqc,
844 t1->mqc.cx_states + ctxno) ^ xorbit)
845 ? -mask : mask;
846
847 ff_jpeg2000_set_significance(t1, x, y,
848 t1->data[y][x] < 0);
849 }
850 t1->flags[y + 1][x + 1] |= JPEG2000_T1_VIS;
851 }
852 }
853
854 static void decode_refpass(Jpeg2000T1Context *t1, int width, int height,
855 int bpno)
856 {
857 int phalf, nhalf;
858 int y0, x, y;
859
860 phalf = 1 << (bpno - 1);
861 nhalf = -phalf;
862
863 for (y0 = 0; y0 < height; y0 += 4)
864 for (x = 0; x < width; x++)
865 for (y = y0; y < height && y < y0 + 4; y++)
866 if ((t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)) == JPEG2000_T1_SIG) {
867 int ctxno = ff_jpeg2000_getrefctxno(t1->flags[y + 1][x + 1]);
868 int r = ff_mqc_decode(&t1->mqc,
869 t1->mqc.cx_states + ctxno)
870 ? phalf : nhalf;
871 t1->data[y][x] += t1->data[y][x] < 0 ? -r : r;
872 t1->flags[y + 1][x + 1] |= JPEG2000_T1_REF;
873 }
874 }
875
876 static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1,
877 int width, int height, int bpno, int bandno,
878 int seg_symbols)
879 {
880 int mask = 3 << (bpno - 1), y0, x, y, runlen, dec;
881
882 for (y0 = 0; y0 < height; y0 += 4)
883 for (x = 0; x < width; x++) {
884 if (y0 + 3 < height &&
885 !((t1->flags[y0 + 1][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
886 (t1->flags[y0 + 2][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
887 (t1->flags[y0 + 3][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
888 (t1->flags[y0 + 4][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)))) {
889 if (!ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_RL))
890 continue;
891 runlen = ff_mqc_decode(&t1->mqc,
892 t1->mqc.cx_states + MQC_CX_UNI);
893 runlen = (runlen << 1) | ff_mqc_decode(&t1->mqc,
894 t1->mqc.cx_states +
895 MQC_CX_UNI);
896 dec = 1;
897 } else {
898 runlen = 0;
899 dec = 0;
900 }
901
902 for (y = y0 + runlen; y < y0 + 4 && y < height; y++) {
903 if (!dec) {
904 if (!(t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)))
905 dec = ff_mqc_decode(&t1->mqc,
906 t1->mqc.cx_states +
907 ff_jpeg2000_getsigctxno(t1->flags[y + 1][x + 1],
908 bandno));
909 }
910 if (dec) {
911 int xorbit;
912 int ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1],
913 &xorbit);
914 t1->data[y][x] = (ff_mqc_decode(&t1->mqc,
915 t1->mqc.cx_states + ctxno) ^
916 xorbit)
917 ? -mask : mask;
918 ff_jpeg2000_set_significance(t1, x, y, t1->data[y][x] < 0);
919 }
920 dec = 0;
921 t1->flags[y + 1][x + 1] &= ~JPEG2000_T1_VIS;
922 }
923 }
924 if (seg_symbols) {
925 int val;
926 val = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
927 val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
928 val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
929 val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
930 if (val != 0xa)
931 av_log(s->avctx, AV_LOG_ERROR,
932 "Segmentation symbol value incorrect\n");
933 }
934 }
935
936 static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
937 Jpeg2000T1Context *t1, Jpeg2000Cblk *cblk,
938 int width, int height, int bandpos)
939 {
940 int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y;
941
942 for (y = 0; y < height; y++)
943 memset(t1->data[y], 0, width * sizeof(width));
944 /* If code-block contains no compressed data: nothing to do. */
945 if (!cblk->length)
946 return 0;
947 for (y = 0; y < height + 2; y++)
948 memset(t1->flags[y], 0, (width + 2) * sizeof(width));
949
950 ff_mqc_initdec(&t1->mqc, cblk->data);
951 cblk->data[cblk->length] = 0xff;
952 cblk->data[cblk->length + 1] = 0xff;
953
954 while (passno--) {
955 switch (pass_t) {
956 case 0:
957 decode_sigpass(t1, width, height, bpno + 1, bandpos);
958 break;
959 case 1:
960 decode_refpass(t1, width, height, bpno + 1);
961 break;
962 case 2:
963 decode_clnpass(s, t1, width, height, bpno + 1, bandpos,
964 codsty->cblk_style & JPEG2000_CBLK_SEGSYM);
965 break;
966 }
967
968 pass_t++;
969 if (pass_t == 3) {
970 bpno--;
971 pass_t = 0;
972 }
973 }
974 return 0;
975 }
976
977 /* TODO: Verify dequantization for lossless case
978 * comp->data can be float or int
979 * band->stepsize can be float or int
980 * depending on the type of DWT transformation.
981 * see ISO/IEC 15444-1:2002 A.6.1 */
982
983 /* Float dequantization of a codeblock.*/
984 static void dequantization_float(int x, int y, Jpeg2000Cblk *cblk,
985 Jpeg2000Component *comp,
986 Jpeg2000T1Context *t1, Jpeg2000Band *band)
987 {
988 int i, j, idx;
989 float *datap = &comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x];
990 for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
991 for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
992 idx = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
993 datap[idx] = (float)(t1->data[j][i]) * ((float)band->stepsize);
994 }
995 }
996
997 /* Integer dequantization of a codeblock.*/
998 static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk,
999 Jpeg2000Component *comp,
1000 Jpeg2000T1Context *t1, Jpeg2000Band *band)
1001 {
1002 int i, j, idx;
1003 int32_t *datap =
1004 (int32_t *) &comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x];
1005 for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
1006 for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
1007 idx = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
1008 datap[idx] =
1009 ((int32_t)(t1->data[j][i]) * ((int32_t)band->stepsize) + (1 << 15)) >> 16;
1010 }
1011 }
1012
1013 /* Inverse ICT parameters in float and integer.
1014 * int value = (float value) * (1<<16) */
1015 static const float f_ict_params[4] = {
1016 1.402f,
1017 0.34413f,
1018 0.71414f,
1019 1.772f
1020 };
1021 static const int i_ict_params[4] = {
1022 91881,
1023 22553,
1024 46802,
1025 116130
1026 };
1027
1028 static void mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
1029 {
1030 int i, csize = 1;
1031 int32_t *src[3], i0, i1, i2;
1032 float *srcf[3], i0f, i1f, i2f;
1033
1034 for (i = 0; i < 3; i++)
1035 if (tile->codsty[0].transform == FF_DWT97)
1036 srcf[i] = tile->comp[i].data;
1037 else
1038 src[i] = (int32_t *)tile->comp[i].data;
1039
1040 for (i = 0; i < 2; i++)
1041 csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0];
1042 switch (tile->codsty[0].transform) {
1043 case FF_DWT97:
1044 for (i = 0; i < csize; i++) {
1045 i0f = *srcf[0] + (f_ict_params[0] * *srcf[2]);
1046 i1f = *srcf[0] - (f_ict_params[1] * *srcf[1])
1047 - (f_ict_params[2] * *srcf[2]);
1048 i2f = *srcf[0] + (f_ict_params[3] * *srcf[1]);
1049 *srcf[0]++ = i0f;
1050 *srcf[1]++ = i1f;
1051 *srcf[2]++ = i2f;
1052 }
1053 break;
1054 case FF_DWT97_INT:
1055 for (i = 0; i < csize; i++) {
1056 i0 = *src[0] + (((i_ict_params[0] * *src[2]) + (1 << 15)) >> 16);
1057 i1 = *src[0] - (((i_ict_params[1] * *src[1]) + (1 << 15)) >> 16)
1058 - (((i_ict_params[2] * *src[2]) + (1 << 15)) >> 16);
1059 i2 = *src[0] + (((i_ict_params[3] * *src[1]) + (1 << 15)) >> 16);
1060 *src[0]++ = i0;
1061 *src[1]++ = i1;
1062 *src[2]++ = i2;
1063 }
1064 break;
1065 case FF_DWT53:
1066 for (i = 0; i < csize; i++) {
1067 i1 = *src[0] - (*src[2] + *src[1] >> 2);
1068 i0 = i1 + *src[2];
1069 i2 = i1 + *src[1];
1070 *src[0]++ = i0;
1071 *src[1]++ = i1;
1072 *src[2]++ = i2;
1073 }
1074 break;
1075 }
1076 }
1077
1078 static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
1079 AVFrame *picture)
1080 {
1081 int compno, reslevelno, bandno;
1082 int x, y;
1083
1084 uint8_t *line;
1085 Jpeg2000T1Context t1;
1086 /* Loop on tile components */
1087
1088 for (compno = 0; compno < s->ncomponents; compno++) {
1089 Jpeg2000Component *comp = tile->comp + compno;
1090 Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1091 /* Loop on resolution levels */
1092 for (reslevelno = 0; reslevelno < codsty->nreslevels2decode; reslevelno++) {
1093 Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1094 /* Loop on bands */
1095 for (bandno = 0; bandno < rlevel->nbands; bandno++) {
1096 uint16_t nb_precincts, precno;
1097 Jpeg2000Band *band = rlevel->band + bandno;
1098 int cblkno = 0, bandpos;
1099 bandpos = bandno + (reslevelno > 0);
1100
1101 nb_precincts = rlevel->num_precincts_x * rlevel->num_precincts_y;
1102 /* Loop on precincts */
1103 for (precno = 0; precno < nb_precincts; precno++) {
1104 Jpeg2000Prec *prec = band->prec + precno;
1105
1106 /* Loop on codeblocks */
1107 for (cblkno = 0; cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height; cblkno++) {
1108 int x, y;
1109 Jpeg2000Cblk *cblk = prec->cblk + cblkno;
1110 decode_cblk(s, codsty, &t1, cblk,
1111 cblk->coord[0][1] - cblk->coord[0][0],
1112 cblk->coord[1][1] - cblk->coord[1][0],
1113 bandpos);
1114
1115 /* Manage band offsets */
1116 x = cblk->coord[0][0];
1117 y = cblk->coord[1][0];
1118 if ((reslevelno > 0) && ((bandno + 1) & 1)) {
1119 Jpeg2000ResLevel *pres = comp->reslevel + (reslevelno - 1);
1120 x += pres->coord[0][1] - pres->coord[0][0];
1121 }
1122 if ((reslevelno > 0) && ((bandno + 1) & 2)) {
1123 Jpeg2000ResLevel *pres = comp->reslevel + (reslevelno - 1);
1124 y += pres->coord[1][1] - pres->coord[1][0];
1125 }
1126
1127 if (s->avctx->flags & CODEC_FLAG_BITEXACT)
1128 dequantization_int(x, y, cblk, comp, &t1, band);
1129 else
1130 dequantization_float(x, y, cblk, comp, &t1, band);
1131 } /* end cblk */
1132 } /*end prec */
1133 } /* end band */
1134 } /* end reslevel */
1135
1136 /* inverse DWT */
1137 ff_dwt_decode(&comp->dwt, comp->data);
1138 } /*end comp */
1139
1140 /* inverse MCT transformation */
1141 if (tile->codsty[0].mct)
1142 mct_decode(s, tile);
1143
1144 if (s->avctx->pix_fmt == AV_PIX_FMT_BGRA) // RGBA -> BGRA
1145 FFSWAP(float *, tile->comp[0].data, tile->comp[2].data);
1146
1147 if (s->precision <= 8) {
1148 for (compno = 0; compno < s->ncomponents; compno++) {
1149 Jpeg2000Component *comp = tile->comp + compno;
1150 int32_t *datap = (int32_t *)comp->data;
1151 y = tile->comp[compno].coord[1][0] - s->image_offset_y;
1152 line = picture->data[0] + y * picture->linesize[0];
1153 for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
1154 uint8_t *dst;
1155
1156 x = tile->comp[compno].coord[0][0] - s->image_offset_x;
1157 dst = line + x * s->ncomponents + compno;
1158
1159 for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s->cdx[compno]) {
1160 *datap += 1 << (s->cbps[compno] - 1);
1161 if (*datap < 0)
1162 *datap = 0;
1163 else if (*datap >= (1 << s->cbps[compno]))
1164 *datap = (1 << s->cbps[compno]) - 1;
1165 *dst = *datap++;
1166 dst += s->ncomponents;
1167 }
1168 line += picture->linesize[0];
1169 }
1170 }
1171 } else {
1172 for (compno = 0; compno < s->ncomponents; compno++) {
1173 Jpeg2000Component *comp = tile->comp + compno;
1174 float *datap = comp->data;
1175 int32_t *i_datap = (int32_t *) comp->data;
1176 uint16_t *linel;
1177
1178 y = tile->comp[compno].coord[1][0] - s->image_offset_y;
1179 linel = (uint16_t *)picture->data[0] + y * (picture->linesize[0] >> 1);
1180 for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
1181 uint16_t *dst;
1182 x = tile->comp[compno].coord[0][0] - s->image_offset_x;
1183 dst = linel + (x * s->ncomponents + compno);
1184 for (; x < s->avctx->width; x += s->cdx[compno]) {
1185 int16_t val;
1186 /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
1187 if (s->avctx->flags & CODEC_FLAG_BITEXACT)
1188 val = *i_datap + (1 << (s->cbps[compno] - 1));
1189 else
1190 val = lrintf(*datap) + (1 << (s->cbps[compno] - 1));
1191 val = av_clip(val, 0, (1 << s->cbps[compno]) - 1);
1192 /* align 12 bit values in little-endian mode */
1193 *dst = val << 4;
1194 datap++;
1195 i_datap++;
1196 dst += s->ncomponents;
1197 }
1198 linel += picture->linesize[0] >> 1;
1199 }
1200 }
1201 }
1202 return 0;
1203 }
1204
1205 static void jpeg2000_dec_cleanup(Jpeg2000DecoderContext *s)
1206 {
1207 int tileno, compno;
1208 for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) {
1209 for (compno = 0; compno < s->ncomponents; compno++) {
1210 Jpeg2000Component *comp = s->tile[tileno].comp + compno;
1211 Jpeg2000CodingStyle *codsty = s->tile[tileno].codsty + compno;
1212
1213 ff_jpeg2000_cleanup(comp, codsty);
1214 }
1215 av_freep(&s->tile[tileno].comp);
1216 }
1217 av_freep(&s->tile);
1218 }
1219
1220 static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s)
1221 {
1222 Jpeg2000CodingStyle *codsty = s->codsty;
1223 Jpeg2000QuantStyle *qntsty = s->qntsty;
1224 uint8_t *properties = s->properties;
1225
1226 for (;;) {
1227 int len, ret = 0;
1228 uint16_t marker;
1229 int oldpos;
1230
1231 if (bytestream2_get_bytes_left(&s->g) < 2) {
1232 av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n");
1233 break;
1234 }
1235
1236 marker = bytestream2_get_be16u(&s->g);
1237 oldpos = bytestream2_tell(&s->g);
1238
1239 if (marker == JPEG2000_EOC)
1240 break;
1241
1242 len = bytestream2_get_be16u(&s->g);
1243 if (len < 2 || bytestream2_get_bytes_left(&s->g) < len - 2)
1244 return AVERROR_INVALIDDATA;
1245
1246 switch (marker) {
1247 case JPEG2000_SIZ:
1248 ret = get_siz(s);
1249 break;
1250 case JPEG2000_COC:
1251 ret = get_coc(s, codsty, properties);
1252 break;
1253 case JPEG2000_COD:
1254 ret = get_cod(s, codsty, properties);
1255 break;
1256 case JPEG2000_QCC:
1257 ret = get_qcc(s, len, qntsty, properties);
1258 break;
1259 case JPEG2000_QCD:
1260 ret = get_qcd(s, len, qntsty, properties);
1261 break;
1262 case JPEG2000_SOT:
1263 ret = get_sot(s, len);
1264 break;
1265 case JPEG2000_COM:
1266 // the comment is ignored
1267 bytestream2_skip(&s->g, len - 2);
1268 break;
1269 case JPEG2000_TLM:
1270 // Tile-part lengths
1271 ret = get_tlm(s, len);
1272 break;
1273 default:
1274 av_log(s->avctx, AV_LOG_ERROR,
1275 "unsupported marker 0x%.4X at pos 0x%X\n",
1276 marker, bytestream2_tell(&s->g) - 4);
1277 bytestream2_skip(&s->g, len - 2);
1278 break;
1279 }
1280 if (((bytestream2_tell(&s->g) - oldpos != len) && (marker != JPEG2000_SOT)) || ret) {
1281 av_log(s->avctx, AV_LOG_ERROR,
1282 "error during processing marker segment %.4x\n", marker);
1283 return ret ? ret : -1;
1284 }
1285 }
1286 return 0;
1287 }
1288
1289 /* Read bit stream packets --> T2 operation. */
1290 static int jpeg2000_read_bitstream_packets(Jpeg2000DecoderContext *s)
1291 {
1292 int ret = 0;
1293 Jpeg2000Tile *tile = s->tile + s->curtileno;
1294
1295 if (ret = init_tile(s, s->curtileno))
1296 return ret;
1297 if (ret = jpeg2000_decode_packets(s, tile))
1298 return ret;
1299
1300 return 0;
1301 }
1302
1303 static int jp2_find_codestream(Jpeg2000DecoderContext *s)
1304 {
1305 uint32_t atom_size, atom;
1306 int found_codestream = 0, search_range = 10;
1307
1308 while(!found_codestream && search_range
1309 &&
1310 bytestream2_get_bytes_left(&s->g) >= 8) {
1311 atom_size = bytestream2_get_be32u(&s->g);
1312 atom = bytestream2_get_be32u(&s->g);
1313 if (atom == JP2_CODESTREAM) {
1314 found_codestream = 1;
1315 } else {
1316 if (bytestream2_get_bytes_left(&s->g) < atom_size - 8)
1317 return 0;
1318 bytestream2_skipu(&s->g, atom_size - 8);
1319 search_range--;
1320 }
1321 }
1322
1323 if (found_codestream)
1324 return 1;
1325 return 0;
1326 }
1327
1328 static int jpeg2000_decode_frame(AVCodecContext *avctx, void *data,
1329 int *got_frame, AVPacket *avpkt)
1330 {
1331 Jpeg2000DecoderContext *s = avctx->priv_data;
1332 ThreadFrame frame = { .f = data };
1333 AVFrame *picture = data;
1334 int tileno, ret;
1335
1336 s->avctx = avctx;
1337 bytestream2_init(&s->g, avpkt->data, avpkt->size);
1338 s->curtileno = 0; // TODO: only one tile in DCI JP2K. to implement for more tiles
1339
1340 // reduction factor, i.e number of resolution levels to skip
1341 s->reduction_factor = s->lowres;
1342
1343 if (bytestream2_get_bytes_left(&s->g) < 2)
1344 return AVERROR_INVALIDDATA;
1345
1346 // check if the image is in jp2 format
1347 if (bytestream2_get_bytes_left(&s->g) >= 12 &&
1348 (bytestream2_get_be32u(&s->g) == 12) &&
1349 (bytestream2_get_be32u(&s->g) == JP2_SIG_TYPE) &&
1350 (bytestream2_get_be32u(&s->g) == JP2_SIG_VALUE)) {
1351 if (!jp2_find_codestream(s)) {
1352 av_log(avctx, AV_LOG_ERROR,
1353 "Could not find Jpeg2000 codestream atom.\n");
1354 return AVERROR_INVALIDDATA;
1355 }
1356 } else {
1357 bytestream2_seek(&s->g, 0, SEEK_SET);
1358 if (bytestream2_peek_be16(&s->g) != JPEG2000_SOC)
1359 bytestream2_skip(&s->g, 8);
1360 }
1361
1362 if (bytestream2_get_be16u(&s->g) != JPEG2000_SOC) {
1363 av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n");
1364 return AVERROR_INVALIDDATA;
1365 }
1366 if (ret = jpeg2000_read_main_headers(s))
1367 goto end;
1368
1369 /* get picture buffer */
1370 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) {
1371 av_log(avctx, AV_LOG_ERROR, "ff_thread_get_buffer() failed.\n");
1372 goto end;
1373 }
1374 picture->pict_type = AV_PICTURE_TYPE_I;
1375 picture->key_frame = 1;
1376
1377 if (ret = jpeg2000_read_bitstream_packets(s))
1378 goto end;
1379 for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)
1380 if (ret = jpeg2000_decode_tile(s, s->tile + tileno, picture))
1381 goto end;
1382
1383 *got_frame = 1;
1384
1385 return bytestream2_tell(&s->g);
1386
1387 end:
1388 jpeg2000_dec_cleanup(s);
1389 return ret;
1390 }
1391
1392 static void jpeg2000_init_static_data(AVCodec *codec)
1393 {
1394 ff_jpeg2000_init_tier1_luts();
1395 }
1396
1397 #define OFFSET(x) offsetof(Jpeg2000DecoderContext, x)
1398 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1399
1400 static const AVOption options[] = {
1401 { "lowres", "Lower the decoding resolution by a power of two",
1402 OFFSET(lowres), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, JPEG2000_MAX_RESLEVELS - 1, VD },
1403 { NULL },
1404 };
1405
1406 static const AVProfile profiles[] = {
1407 { FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0, "JPEG 2000 codestream restriction 0" },
1408 { FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1, "JPEG 2000 codestream restriction 1" },
1409 { FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION, "JPEG 2000 no codestream restrictions" },
1410 { FF_PROFILE_JPEG2000_DCINEMA_2K, "JPEG 2000 digital cinema 2K" },
1411 { FF_PROFILE_JPEG2000_DCINEMA_4K, "JPEG 2000 digital cinema 4K" },
1412 { FF_PROFILE_UNKNOWN },
1413 };
1414
1415 static const AVClass class = {
1416 .class_name = "jpeg2000",
1417 .item_name = av_default_item_name,
1418 .option = options,
1419 .version = LIBAVUTIL_VERSION_INT,
1420 };
1421
1422 AVCodec ff_jpeg2000_decoder = {
1423 .name = "jpeg2000",
1424 .long_name = NULL_IF_CONFIG_SMALL("JPEG 2000"),
1425 .type = AVMEDIA_TYPE_VIDEO,
1426 .id = AV_CODEC_ID_JPEG2000,
1427 .capabilities = CODEC_CAP_FRAME_THREADS,
1428 .priv_data_size = sizeof(Jpeg2000DecoderContext),
1429 .init_static_data = jpeg2000_init_static_data,
1430 .decode = jpeg2000_decode_frame,
1431 .priv_class = &class,
1432 .pix_fmts = (enum AVPixelFormat[]) { AV_PIX_FMT_XYZ12,
1433 AV_PIX_FMT_GRAY8,
1434 -1 },
1435 .profiles = NULL_IF_CONFIG_SMALL(profiles)
1436 };