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path: root/libavcodec/jpeglsdec.c (plain)
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1/*
2 * JPEG-LS decoder
3 * Copyright (c) 2003 Michael Niedermayer
4 * Copyright (c) 2006 Konstantin Shishkov
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-LS decoder.
26 */
27
28#include "avcodec.h"
29#include "get_bits.h"
30#include "golomb.h"
31#include "internal.h"
32#include "mathops.h"
33#include "mjpeg.h"
34#include "mjpegdec.h"
35#include "jpegls.h"
36#include "jpeglsdec.h"
37
38/*
39 * Uncomment this to significantly speed up decoding of broken JPEG-LS
40 * (or test broken JPEG-LS decoder) and slow down ordinary decoding a bit.
41 *
42 * There is no Golomb code with length >= 32 bits possible, so check and
43 * avoid situation of 32 zeros, FFmpeg Golomb decoder is painfully slow
44 * on this errors.
45 */
46//#define JLS_BROKEN
47
48/**
49 * Decode LSE block with initialization parameters
50 */
51int ff_jpegls_decode_lse(MJpegDecodeContext *s)
52{
53 int id;
54 int tid, wt, maxtab, i, j;
55
56 int len = get_bits(&s->gb, 16);
57 id = get_bits(&s->gb, 8);
58
59 switch (id) {
60 case 1:
61 if (len < 13)
62 return AVERROR_INVALIDDATA;
63
64 s->maxval = get_bits(&s->gb, 16);
65 s->t1 = get_bits(&s->gb, 16);
66 s->t2 = get_bits(&s->gb, 16);
67 s->t3 = get_bits(&s->gb, 16);
68 s->reset = get_bits(&s->gb, 16);
69
70 if(s->avctx->debug & FF_DEBUG_PICT_INFO) {
71 av_log(s->avctx, AV_LOG_DEBUG, "Coding parameters maxval:%d T1:%d T2:%d T3:%d reset:%d\n",
72 s->maxval, s->t1, s->t2, s->t3, s->reset);
73 }
74
75// ff_jpegls_reset_coding_parameters(s, 0);
76 //FIXME quant table?
77 break;
78 case 2:
79 s->palette_index = 0;
80 case 3:
81 tid= get_bits(&s->gb, 8);
82 wt = get_bits(&s->gb, 8);
83
84 if (len < 5)
85 return AVERROR_INVALIDDATA;
86
87 if (wt < 1 || wt > MAX_COMPONENTS) {
88 avpriv_request_sample(s->avctx, "wt %d", wt);
89 return AVERROR_PATCHWELCOME;
90 }
91
92 if (!s->maxval)
93 maxtab = 255;
94 else if ((5 + wt*(s->maxval+1)) < 65535)
95 maxtab = s->maxval;
96 else
97 maxtab = 65530/wt - 1;
98
99 if(s->avctx->debug & FF_DEBUG_PICT_INFO) {
100 av_log(s->avctx, AV_LOG_DEBUG, "LSE palette %d tid:%d wt:%d maxtab:%d\n", id, tid, wt, maxtab);
101 }
102 if (maxtab >= 256) {
103 avpriv_request_sample(s->avctx, ">8bit palette");
104 return AVERROR_PATCHWELCOME;
105 }
106 maxtab = FFMIN(maxtab, (len - 5) / wt + s->palette_index);
107
108 if (s->palette_index > maxtab)
109 return AVERROR_INVALIDDATA;
110
111 if ((s->avctx->pix_fmt == AV_PIX_FMT_GRAY8 || s->avctx->pix_fmt == AV_PIX_FMT_PAL8) &&
112 (s->picture_ptr->format == AV_PIX_FMT_GRAY8 || s->picture_ptr->format == AV_PIX_FMT_PAL8)) {
113 uint32_t *pal = (uint32_t *)s->picture_ptr->data[1];
114 int shift = 0;
115
116 if (s->avctx->bits_per_raw_sample > 0 && s->avctx->bits_per_raw_sample < 8) {
117 maxtab = FFMIN(maxtab, (1<<s->avctx->bits_per_raw_sample)-1);
118 shift = 8 - s->avctx->bits_per_raw_sample;
119 }
120
121 s->picture_ptr->format =
122 s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
123 for (i=s->palette_index; i<=maxtab; i++) {
124 uint8_t k = i << shift;
125 pal[k] = 0;
126 for (j=0; j<wt; j++) {
127 pal[k] |= get_bits(&s->gb, 8) << (8*(wt-j-1));
128 }
129 }
130 s->palette_index = i;
131 }
132 break;
133 case 4:
134 avpriv_request_sample(s->avctx, "oversize image");
135 return AVERROR(ENOSYS);
136 default:
137 av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id);
138 return AVERROR_INVALIDDATA;
139 }
140 ff_dlog(s->avctx, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3);
141
142 return 0;
143}
144
145/**
146 * Get context-dependent Golomb code, decode it and update context
147 */
148static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q)
149{
150 int k, ret;
151
152 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
153 ;
154
155#ifdef JLS_BROKEN
156 if (!show_bits_long(gb, 32))
157 return -1;
158#endif
159 ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp);
160
161 /* decode mapped error */
162 if (ret & 1)
163 ret = -(ret + 1 >> 1);
164 else
165 ret >>= 1;
166
167 /* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */
168 if (!state->near && !k && (2 * state->B[Q] <= -state->N[Q]))
169 ret = -(ret + 1);
170
171 ret = ff_jpegls_update_state_regular(state, Q, ret);
172
173 return ret;
174}
175
176/**
177 * Get Golomb code, decode it and update state for run termination
178 */
179static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state,
180 int RItype, int limit_add)
181{
182 int k, ret, temp, map;
183 int Q = 365 + RItype;
184
185 temp = state->A[Q];
186 if (RItype)
187 temp += state->N[Q] >> 1;
188
189 for (k = 0; (state->N[Q] << k) < temp; k++)
190 ;
191
192#ifdef JLS_BROKEN
193 if (!show_bits_long(gb, 32))
194 return -1;
195#endif
196 ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1,
197 state->qbpp);
198
199 /* decode mapped error */
200 map = 0;
201 if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
202 map = 1;
203 ret += RItype + map;
204
205 if (ret & 1) {
206 ret = map - (ret + 1 >> 1);
207 state->B[Q]++;
208 } else {
209 ret = ret >> 1;
210 }
211
212 if(FFABS(ret) > 0xFFFF)
213 return -0x10000;
214 /* update state */
215 state->A[Q] += FFABS(ret) - RItype;
216 ret *= state->twonear;
217 ff_jpegls_downscale_state(state, Q);
218
219 return ret;
220}
221
222/**
223 * Decode one line of image
224 */
225static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
226 void *last, void *dst, int last2, int w,
227 int stride, int comp, int bits)
228{
229 int i, x = 0;
230 int Ra, Rb, Rc, Rd;
231 int D0, D1, D2;
232
233 while (x < w) {
234 int err, pred;
235
236 /* compute gradients */
237 Ra = x ? R(dst, x - stride) : R(last, x);
238 Rb = R(last, x);
239 Rc = x ? R(last, x - stride) : last2;
240 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
241 D0 = Rd - Rb;
242 D1 = Rb - Rc;
243 D2 = Rc - Ra;
244 /* run mode */
245 if ((FFABS(D0) <= state->near) &&
246 (FFABS(D1) <= state->near) &&
247 (FFABS(D2) <= state->near)) {
248 int r;
249 int RItype;
250
251 /* decode full runs while available */
252 while (get_bits1(&s->gb)) {
253 int r;
254 r = 1 << ff_log2_run[state->run_index[comp]];
255 if (x + r * stride > w)
256 r = (w - x) / stride;
257 for (i = 0; i < r; i++) {
258 W(dst, x, Ra);
259 x += stride;
260 }
261 /* if EOL reached, we stop decoding */
262 if (r != 1 << ff_log2_run[state->run_index[comp]])
263 return;
264 if (state->run_index[comp] < 31)
265 state->run_index[comp]++;
266 if (x + stride > w)
267 return;
268 }
269 /* decode aborted run */
270 r = ff_log2_run[state->run_index[comp]];
271 if (r)
272 r = get_bits_long(&s->gb, r);
273 if (x + r * stride > w) {
274 r = (w - x) / stride;
275 }
276 for (i = 0; i < r; i++) {
277 W(dst, x, Ra);
278 x += stride;
279 }
280
281 if (x >= w) {
282 av_log(NULL, AV_LOG_ERROR, "run overflow\n");
283 av_assert0(x <= w);
284 return;
285 }
286
287 /* decode run termination value */
288 Rb = R(last, x);
289 RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0;
290 err = ls_get_code_runterm(&s->gb, state, RItype,
291 ff_log2_run[state->run_index[comp]]);
292 if (state->run_index[comp])
293 state->run_index[comp]--;
294
295 if (state->near && RItype) {
296 pred = Ra + err;
297 } else {
298 if (Rb < Ra)
299 pred = Rb - err;
300 else
301 pred = Rb + err;
302 }
303 } else { /* regular mode */
304 int context, sign;
305
306 context = ff_jpegls_quantize(state, D0) * 81 +
307 ff_jpegls_quantize(state, D1) * 9 +
308 ff_jpegls_quantize(state, D2);
309 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
310
311 if (context < 0) {
312 context = -context;
313 sign = 1;
314 } else {
315 sign = 0;
316 }
317
318 if (sign) {
319 pred = av_clip(pred - state->C[context], 0, state->maxval);
320 err = -ls_get_code_regular(&s->gb, state, context);
321 } else {
322 pred = av_clip(pred + state->C[context], 0, state->maxval);
323 err = ls_get_code_regular(&s->gb, state, context);
324 }
325
326 /* we have to do something more for near-lossless coding */
327 pred += err;
328 }
329 if (state->near) {
330 if (pred < -state->near)
331 pred += state->range * state->twonear;
332 else if (pred > state->maxval + state->near)
333 pred -= state->range * state->twonear;
334 pred = av_clip(pred, 0, state->maxval);
335 }
336
337 pred &= state->maxval;
338 W(dst, x, pred);
339 x += stride;
340 }
341}
342
343int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
344 int point_transform, int ilv)
345{
346 int i, t = 0;
347 uint8_t *zero, *last, *cur;
348 JLSState *state;
349 int off = 0, stride = 1, width, shift, ret = 0;
350
351 zero = av_mallocz(s->picture_ptr->linesize[0]);
352 if (!zero)
353 return AVERROR(ENOMEM);
354 last = zero;
355 cur = s->picture_ptr->data[0];
356
357 state = av_mallocz(sizeof(JLSState));
358 if (!state) {
359 av_free(zero);
360 return AVERROR(ENOMEM);
361 }
362 /* initialize JPEG-LS state from JPEG parameters */
363 state->near = near;
364 state->bpp = (s->bits < 2) ? 2 : s->bits;
365 state->maxval = s->maxval;
366 state->T1 = s->t1;
367 state->T2 = s->t2;
368 state->T3 = s->t3;
369 state->reset = s->reset;
370 ff_jpegls_reset_coding_parameters(state, 0);
371 ff_jpegls_init_state(state);
372
373 if (s->bits <= 8)
374 shift = point_transform + (8 - s->bits);
375 else
376 shift = point_transform + (16 - s->bits);
377
378 if (shift >= 16) {
379 ret = AVERROR_INVALIDDATA;
380 goto end;
381 }
382
383 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
384 av_log(s->avctx, AV_LOG_DEBUG,
385 "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) "
386 "RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",
387 s->width, s->height, state->near, state->maxval,
388 state->T1, state->T2, state->T3,
389 state->reset, state->limit, state->qbpp, state->range);
390 av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n",
391 ilv, point_transform, s->bits, s->cur_scan);
392 }
393 if (ilv == 0) { /* separate planes */
394 if (s->cur_scan > s->nb_components) {
395 ret = AVERROR_INVALIDDATA;
396 goto end;
397 }
398 stride = (s->nb_components > 1) ? 3 : 1;
399 off = av_clip(s->cur_scan - 1, 0, stride - 1);
400 width = s->width * stride;
401 cur += off;
402 for (i = 0; i < s->height; i++) {
403 if (s->bits <= 8) {
404 ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
405 t = last[0];
406 } else {
407 ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
408 t = *((uint16_t *)last);
409 }
410 last = cur;
411 cur += s->picture_ptr->linesize[0];
412
413 if (s->restart_interval && !--s->restart_count) {
414 align_get_bits(&s->gb);
415 skip_bits(&s->gb, 16); /* skip RSTn */
416 }
417 }
418 } else if (ilv == 1) { /* line interleaving */
419 int j;
420 int Rc[3] = { 0, 0, 0 };
421 stride = (s->nb_components > 1) ? 3 : 1;
422 memset(cur, 0, s->picture_ptr->linesize[0]);
423 width = s->width * stride;
424 for (i = 0; i < s->height; i++) {
425 for (j = 0; j < stride; j++) {
426 ls_decode_line(state, s, last + j, cur + j,
427 Rc[j], width, stride, j, 8);
428 Rc[j] = last[j];
429
430 if (s->restart_interval && !--s->restart_count) {
431 align_get_bits(&s->gb);
432 skip_bits(&s->gb, 16); /* skip RSTn */
433 }
434 }
435 last = cur;
436 cur += s->picture_ptr->linesize[0];
437 }
438 } else if (ilv == 2) { /* sample interleaving */
439 avpriv_report_missing_feature(s->avctx, "Sample interleaved images");
440 ret = AVERROR_PATCHWELCOME;
441 goto end;
442 }
443
444 if (s->xfrm && s->nb_components == 3) {
445 int x, w;
446
447 w = s->width * s->nb_components;
448
449 if (s->bits <= 8) {
450 uint8_t *src = s->picture_ptr->data[0];
451
452 for (i = 0; i < s->height; i++) {
453 switch(s->xfrm) {
454 case 1:
455 for (x = off; x < w; x += 3) {
456 src[x ] += src[x+1] + 128;
457 src[x+2] += src[x+1] + 128;
458 }
459 break;
460 case 2:
461 for (x = off; x < w; x += 3) {
462 src[x ] += src[x+1] + 128;
463 src[x+2] += ((src[x ] + src[x+1])>>1) + 128;
464 }
465 break;
466 case 3:
467 for (x = off; x < w; x += 3) {
468 int g = src[x+0] - ((src[x+2]+src[x+1])>>2) + 64;
469 src[x+0] = src[x+2] + g + 128;
470 src[x+2] = src[x+1] + g + 128;
471 src[x+1] = g;
472 }
473 break;
474 case 4:
475 for (x = off; x < w; x += 3) {
476 int r = src[x+0] - (( 359 * (src[x+2]-128) + 490) >> 8);
477 int g = src[x+0] - (( 88 * (src[x+1]-128) - 183 * (src[x+2]-128) + 30) >> 8);
478 int b = src[x+0] + ((454 * (src[x+1]-128) + 574) >> 8);
479 src[x+0] = av_clip_uint8(r);
480 src[x+1] = av_clip_uint8(g);
481 src[x+2] = av_clip_uint8(b);
482 }
483 break;
484 }
485 src += s->picture_ptr->linesize[0];
486 }
487 }else
488 avpriv_report_missing_feature(s->avctx, "16bit xfrm");
489 }
490
491 if (shift) { /* we need to do point transform or normalize samples */
492 int x, w;
493
494 w = s->width * s->nb_components;
495
496 if (s->bits <= 8) {
497 uint8_t *src = s->picture_ptr->data[0];
498
499 for (i = 0; i < s->height; i++) {
500 for (x = off; x < w; x += stride)
501 src[x] <<= shift;
502 src += s->picture_ptr->linesize[0];
503 }
504 } else {
505 uint16_t *src = (uint16_t *)s->picture_ptr->data[0];
506
507 for (i = 0; i < s->height; i++) {
508 for (x = 0; x < w; x++)
509 src[x] <<= shift;
510 src += s->picture_ptr->linesize[0] / 2;
511 }
512 }
513 }
514
515end:
516 av_free(state);
517 av_free(zero);
518
519 return ret;
520}
521
522AVCodec ff_jpegls_decoder = {
523 .name = "jpegls",
524 .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
525 .type = AVMEDIA_TYPE_VIDEO,
526 .id = AV_CODEC_ID_JPEGLS,
527 .priv_data_size = sizeof(MJpegDecodeContext),
528 .init = ff_mjpeg_decode_init,
529 .close = ff_mjpeg_decode_end,
530 .decode = ff_mjpeg_decode_frame,
531 .capabilities = AV_CODEC_CAP_DR1,
532 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
533};
534
generated by cgit at 2024-05-17 01:46:28 (GMT)