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揭露运营商小秘密，你是不是办了一个“假宽带”？

Directory: ../../../ffmpeg/
File: src/libavcodec/jpeglsdec.c
Date: 2025-08-04 11:35:17
Exec Total Coverage
Lines: 206 314 65.6%
Functions: 5 5 100.0%
Branches: 141 244 57.8%
Line Branch Exec Source
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 "libavutil/mem.h"
29 #include "avcodec.h"
30 #include "codec_internal.h"
31 #include "get_bits.h"
32 #include "golomb.h"
33 #include "mathops.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 */
51 16 int ff_jpegls_decode_lse(MJpegDecodeContext *s)
52 {
53 int id;
54 int tid, wt, maxtab, i, j;
55
56 16 int len = get_bits(&s->gb, 16);
57 16 id = get_bits(&s->gb, 8);
58
59
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 16 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 16 case 2:
79 16 s->palette_index = 0;
80 16 case 3:
81 16 tid= get_bits(&s->gb, 8);
82 16 wt = get_bits(&s->gb, 8);
83
84
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 16 if (len < 5)
85 ✗ return AVERROR_INVALIDDATA;
86
87
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 16 if (wt < 1 || wt > MAX_COMPONENTS) {
88 ✗ avpriv_request_sample(s->avctx, "wt %d", wt);
89 ✗ return AVERROR_PATCHWELCOME;
90 }
91
92
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 16 if (!s->maxval)
93 16 maxtab = 255;
94 ✗ else if ((5 + wt*(s->maxval+1)) < 65535)
95 ✗ maxtab = s->maxval;
96 else
97 ✗ maxtab = 65530/wt - 1;
98
99
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 16 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
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 16 if (maxtab >= 256) {
103 ✗ avpriv_request_sample(s->avctx, ">8bit palette");
104 ✗ return AVERROR_PATCHWELCOME;
105 }
106 16 maxtab = FFMIN(maxtab, (len - 5) / wt + s->palette_index);
107
108
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 16 if (s->palette_index > maxtab)
109 ✗ return AVERROR_INVALIDDATA;
110
111
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 16 if ((s->avctx->pix_fmt == AV_PIX_FMT_GRAY8 || s->avctx->pix_fmt == AV_PIX_FMT_PAL8) &&
112
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 16 (s->picture_ptr->format == AV_PIX_FMT_GRAY8 || s->picture_ptr->format == AV_PIX_FMT_PAL8)) {
113 16 uint32_t *pal = (uint32_t *)s->picture_ptr->data[1];
114 16 int shift = 0;
115
116
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 16 if (s->avctx->bits_per_raw_sample > 0 && s->avctx->bits_per_raw_sample < 8) {
117
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 16 maxtab = FFMIN(maxtab, (1<<s->avctx->bits_per_raw_sample)-1);
118 16 shift = 8 - s->avctx->bits_per_raw_sample;
119 }
120
121 16 s->force_pal8++;
122
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 16 if (!pal) {
123
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 8 if (s->force_pal8 > 1)
124 ✗ return AVERROR_INVALIDDATA;
125 8 return 1;
126 }
127
128
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 352 for (i=s->palette_index; i<=maxtab; i++) {
129 344 uint8_t k = i << shift;
130
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 344 pal[k] = wt < 4 ? 0xFF000000 : 0;
131
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 1376 for (j=0; j<wt; j++) {
132 1032 pal[k] |= get_bits(&s->gb, 8) << (8*(wt-j-1));
133 }
134 }
135 8 s->palette_index = i;
136 }
137 8 break;
138 ✗ case 4:
139 ✗ avpriv_request_sample(s->avctx, "oversize image");
140 ✗ return AVERROR(ENOSYS);
141 ✗ default:
142 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id);
143 ✗ return AVERROR_INVALIDDATA;
144 }
145 ff_dlog(s->avctx, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3);
146
147 8 return 0;
148 }
149
150 /**
151 * Get context-dependent Golomb code, decode it and update context
152 */
153 46507616 static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q)
154 {
155 int k, ret;
156
157
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 166898010 for (k = 0; ((unsigned)state->N[Q] << k) < state->A[Q]; k++)
158 ;
159
160 #ifdef JLS_BROKEN
161 if (!show_bits_long(gb, 32))
162 return -1;
163 #endif
164 46507616 ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp);
165
166 /* decode mapped error */
167
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 46507616 if (ret & 1)
168 23829574 ret = -(ret + 1 >> 1);
169 else
170 22678042 ret >>= 1;
171
172 /* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */
173
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 46507616 if (!state->near && !k && (2 * state->B[Q] <= -state->N[Q]))
174 840496 ret = -(ret + 1);
175
176 46507616 ret = ff_jpegls_update_state_regular(state, Q, ret);
177
178 46507616 return ret;
179 }
180
181 /**
182 * Get Golomb code, decode it and update state for run termination
183 */
184 783661 static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state,
185 int RItype, int limit_add)
186 {
187 int k, ret, temp, map;
188 783661 int Q = 365 + RItype;
189
190 783661 temp = state->A[Q];
191
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 783661 if (RItype)
192 509232 temp += state->N[Q] >> 1;
193
194
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 2668080 for (k = 0; ((unsigned)state->N[Q] << k) < temp; k++)
195 ;
196
197 #ifdef JLS_BROKEN
198 if (!show_bits_long(gb, 32))
199 return -1;
200 #endif
201 783661 ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1,
202 state->qbpp);
203
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 783661 if (ret < 0)
204 ✗ return -0x10000;
205
206 /* decode mapped error */
207 783661 map = 0;
208
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 783661 if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
209 60548 map = 1;
210 783661 ret += RItype + map;
211
212
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 783661 if (ret & 1) {
213 351896 ret = map - (ret + 1 >> 1);
214 351896 state->B[Q]++;
215 } else {
216 431765 ret = ret >> 1;
217 }
218
219
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 783661 if (FFABS(ret) > 0xFFFF)
220 ✗ return -0x10000;
221 /* update state */
222 783661 state->A[Q] += FFABS(ret) - RItype;
223 783661 ret *= state->twonear;
224 783661 ff_jpegls_downscale_state(state, Q);
225
226 783661 return ret;
227 }
228
229 /**
230 * Decode one line of image
231 */
232 143946 static inline int ls_decode_line(JLSState *state, MJpegDecodeContext *s,
233 void *last, void *dst, int last2, int w,
234 int stride, int comp, int bits)
235 {
236 143946 int i, x = 0;
237 int Ra, Rb, Rc, Rd;
238 int D0, D1, D2;
239
240
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 47435223 while (x < w) {
241 int err, pred;
242
243
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 47299272 if (get_bits_left(&s->gb) <= 0)
244 ✗ return AVERROR_INVALIDDATA;
245
246 /* compute gradients */
247
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 47299272 Ra = x ? R(dst, x - stride) : R(last, x);
248
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 47299272 Rb = R(last, x);
249
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 47299272 Rc = x ? R(last, x - stride) : last2;
250
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 47299272 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
251 47299272 D0 = Rd - Rb;
252 47299272 D1 = Rb - Rc;
253 47299272 D2 = Rc - Ra;
254 /* run mode */
255
2/2
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 47299272 if ((FFABS(D0) <= state->near) &&
256
2/2
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 5800192 (FFABS(D1) <= state->near) &&
257
2/2
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 2971841 (FFABS(D2) <= state->near)) {
258 int r;
259 int RItype;
260
261 /* decode full runs while available */
262
2/2
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 1521576 while (get_bits1(&s->gb)) {
263 int r;
264 737915 r = 1 << ff_log2_run[state->run_index[comp]];
265
2/2
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 737915 if (x + r * stride > w)
266 6338 r = (w - x) / stride;
267
2/2
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 3492933 for (i = 0; i < r; i++) {
268
1/2
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 2755018 W(dst, x, Ra);
269 2755018 x += stride;
270 }
271 /* if EOL reached, we stop decoding */
272
2/2
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 737915 if (r != 1 << ff_log2_run[state->run_index[comp]])
273 6338 return 0;
274
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 731577 if (state->run_index[comp] < 31)
275 731577 state->run_index[comp]++;
276
2/2
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 731577 if (x + stride > w)
277 1657 return 0;
278 }
279 /* decode aborted run */
280 783661 r = ff_log2_run[state->run_index[comp]];
281
2/2
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 783661 if (r)
282 647235 r = get_bits(&s->gb, r);
283
1/2
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 783661 if (x + r * stride > w) {
284 ✗ r = (w - x) / stride;
285 }
286
2/2
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 1794114 for (i = 0; i < r; i++) {
287
1/2
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 1010453 W(dst, x, Ra);
288 1010453 x += stride;
289 }
290
291
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 783661 if (x >= w) {
292 ✗ av_log(NULL, AV_LOG_ERROR, "run overflow\n");
293 ✗ av_assert0(x <= w);
294 ✗ return AVERROR_INVALIDDATA;
295 }
296
297 /* decode run termination value */
298
1/2
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 783661 Rb = R(last, x);
299 783661 RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0;
300 783661 err = ls_get_code_runterm(&s->gb, state, RItype,
301 783661 ff_log2_run[state->run_index[comp]]);
302
2/2
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 783661 if (state->run_index[comp])
303 729428 state->run_index[comp]--;
304
305
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 783661 if (state->near && RItype) {
306 ✗ pred = Ra + err;
307 } else {
308
2/2
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✓ Branch 1 taken 613654 times.
 783661 if (Rb < Ra)
309 170007 pred = Rb - err;
310 else
311 613654 pred = Rb + err;
312 }
313 } else { /* regular mode */
314 int context, sign;
315
316 46507616 context = ff_jpegls_quantize(state, D0) * 81 +
317 46507616 ff_jpegls_quantize(state, D1) * 9 +
318 46507616 ff_jpegls_quantize(state, D2);
319 46507616 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
320
321
2/2
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✓ Branch 1 taken 27473399 times.
 46507616 if (context < 0) {
322 19034217 context = -context;
323 19034217 sign = 1;
324 } else {
325 27473399 sign = 0;
326 }
327
328
2/2
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 46507616 if (sign) {
329 19034217 pred = av_clip(pred - state->C[context], 0, state->maxval);
330 19034217 err = -ls_get_code_regular(&s->gb, state, context);
331 } else {
332 27473399 pred = av_clip(pred + state->C[context], 0, state->maxval);
333 27473399 err = ls_get_code_regular(&s->gb, state, context);
334 }
335
336 /* we have to do something more for near-lossless coding */
337 46507616 pred += err;
338 }
339
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 47291277 if (state->near) {
340 ✗ if (pred < -state->near)
341 ✗ pred += state->range * state->twonear;
342 ✗ else if (pred > state->maxval + state->near)
343 ✗ pred -= state->range * state->twonear;
344 ✗ pred = av_clip(pred, 0, state->maxval);
345 }
346
347 47291277 pred &= state->maxval;
348
1/2
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 47291277 W(dst, x, pred);
349 47291277 x += stride;
350 }
351
352 135951 return 0;
353 }
354
355 213 int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
356 int point_transform, int ilv)
357 {
358 213 int i, t = 0;
359 uint8_t *zero, *last, *cur;
360 213 JLSState *state = s->jls_state;
361 213 int off = 0, stride = 1, width, shift, ret = 0;
362 213 int decoded_height = 0;
363
364
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 213 if (!state) {
365 17 state = av_malloc(sizeof(*state));
366
1/2
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 17 if (!state)
367 ✗ return AVERROR(ENOMEM);
368 17 s->jls_state = state;
369 }
370 213 zero = av_mallocz(s->picture_ptr->linesize[0]);
371
1/2
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 213 if (!zero)
372 ✗ return AVERROR(ENOMEM);
373 213 last = zero;
374 213 cur = s->picture_ptr->data[0];
375
376 /* initialize JPEG-LS state from JPEG parameters */
377 213 memset(state, 0, sizeof(*state));
378 213 state->near = near;
379 213 state->bpp = (s->bits < 2) ? 2 : s->bits;
380 213 state->maxval = s->maxval;
381 213 state->T1 = s->t1;
382 213 state->T2 = s->t2;
383 213 state->T3 = s->t3;
384 213 state->reset = s->reset;
385 213 ff_jpegls_reset_coding_parameters(state, 0);
386
387 /* Testing parameters here, we cannot test in LSE or SOF because
388 * these interdepend and are allowed in either order
389 */
390
1/2
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 213 if (state->maxval >= (1<<state->bpp) ||
391
1/2
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 213 state->T1 > state->T2 ||
392
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 213 state->T2 > state->T3 ||
393
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 213 state->T3 > state->maxval ||
394
1/2
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 213 state->reset > FFMAX(255, state->maxval)) {
395 ✗ ret = AVERROR_INVALIDDATA;
396 ✗ goto end;
397 }
398
399 213 ff_jpegls_init_state(state);
400
401
1/2
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 213 if (s->bits <= 8)
402 213 shift = point_transform + (8 - s->bits);
403 else
404 ✗ shift = point_transform + (16 - s->bits);
405
406
1/2
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✓ Branch 1 taken 213 times.
 213 if (shift >= 16) {
407 ✗ ret = AVERROR_INVALIDDATA;
408 ✗ goto end;
409 }
410
411
1/2
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✓ Branch 1 taken 213 times.
 213 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
412 ✗ av_log(s->avctx, AV_LOG_DEBUG,
413 "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) "
414 "RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",
415 s->width, s->height, state->near, state->maxval,
416 state->T1, state->T2, state->T3,
417 state->reset, state->limit, state->qbpp, state->range);
418 ✗ av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n",
419 ilv, point_transform, s->bits, s->cur_scan);
420 }
421
1/2
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✓ Branch 2 taken 213 times.
 213 if (get_bits_left(&s->gb) < s->height) {
422 ✗ ret = AVERROR_INVALIDDATA;
423 ✗ goto end;
424 }
425
2/2
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✓ Branch 1 taken 205 times.
 213 if (ilv == 0) { /* separate planes */
426
1/2
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 8 if (s->cur_scan > s->nb_components) {
427 ✗ ret = AVERROR_INVALIDDATA;
428 ✗ goto end;
429 }
430
1/2
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✓ Branch 1 taken 8 times.
 8 stride = (s->nb_components > 1) ? 3 : 1;
431 8 off = av_clip(s->cur_scan - 1, 0, stride - 1);
432 8 width = s->width * stride;
433 8 cur += off;
434
2/2
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 5696 for (i = 0; i < s->height; i++) {
435 int ret;
436
1/2
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 5688 if (s->bits <= 8) {
437 5688 ret = ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
438 5688 t = last[0];
439 } else {
440 ✗ ret = ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
441 ✗ t = *((uint16_t *)last);
442 }
443
1/2
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 5688 if (ret < 0)
444 ✗ break;
445 5688 last = cur;
446 5688 cur += s->picture_ptr->linesize[0];
447
448
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 5688 if (s->restart_interval && !--s->restart_count) {
449 ✗ align_get_bits(&s->gb);
450 ✗ skip_bits(&s->gb, 16); /* skip RSTn */
451 }
452 }
453 8 decoded_height = i;
454
1/2
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 205 } else if (ilv == 1) { /* line interleaving */
455 int j;
456 205 int Rc[3] = { 0, 0, 0 };
457
1/2
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 205 stride = (s->nb_components > 1) ? 3 : 1;
458 205 memset(cur, 0, s->picture_ptr->linesize[0]);
459 205 width = s->width * stride;
460
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 46291 for (i = 0; i < s->height; i++) {
461 int ret;
462
2/2
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 184344 for (j = 0; j < stride; j++) {
463 138258 ret = ls_decode_line(state, s, last + j, cur + j,
464 Rc[j], width, stride, j, 8);
465
1/2
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 138258 if (ret < 0)
466 ✗ break;
467 138258 Rc[j] = last[j];
468
469
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 138258 if (s->restart_interval && !--s->restart_count) {
470 ✗ align_get_bits(&s->gb);
471 ✗ skip_bits(&s->gb, 16); /* skip RSTn */
472 }
473 }
474
1/2
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✓ Branch 1 taken 46086 times.
 46086 if (ret < 0)
475 ✗ break;
476 46086 last = cur;
477 46086 cur += s->picture_ptr->linesize[0];
478 }
479 205 decoded_height = i;
480 ✗ } else if (ilv == 2) { /* sample interleaving */
481 ✗ avpriv_report_missing_feature(s->avctx, "Sample interleaved images");
482 ✗ ret = AVERROR_PATCHWELCOME;
483 ✗ goto end;
484 } else { /* unknown interleaving */
485 ✗ avpriv_report_missing_feature(s->avctx, "Unknown interleaved images");
486 ✗ ret = AVERROR_PATCHWELCOME;
487 ✗ goto end;
488 }
489
490
1/4
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 213 if (s->xfrm && s->nb_components == 3) {
491 int x, w;
492
493 ✗ w = s->width * s->nb_components;
494
495 ✗ if (s->bits <= 8) {
496 ✗ uint8_t *src = s->picture_ptr->data[0];
497
498 ✗ for (i = 0; i < s->height; i++) {
499 ✗ switch(s->xfrm) {
500 ✗ case 1:
501 ✗ for (x = off; x + 2 < w; x += 3) {
502 ✗ src[x ] += src[x+1] + 128;
503 ✗ src[x+2] += src[x+1] + 128;
504 }
505 ✗ break;
506 ✗ case 2:
507 ✗ for (x = off; x + 2 < w; x += 3) {
508 ✗ src[x ] += src[x+1] + 128;
509 ✗ src[x+2] += ((src[x ] + src[x+1])>>1) + 128;
510 }
511 ✗ break;
512 ✗ case 3:
513 ✗ for (x = off; x + 2 < w; x += 3) {
514 ✗ int g = src[x+0] - ((src[x+2]+src[x+1])>>2) + 64;
515 ✗ src[x+0] = src[x+2] + g + 128;
516 ✗ src[x+2] = src[x+1] + g + 128;
517 ✗ src[x+1] = g;
518 }
519 ✗ break;
520 ✗ case 4:
521 ✗ for (x = off; x + 2 < w; x += 3) {
522 ✗ int r = src[x+0] - (( 359 * (src[x+2]-128) + 490) >> 8);
523 ✗ int g = src[x+0] - (( 88 * (src[x+1]-128) - 183 * (src[x+2]-128) + 30) >> 8);
524 ✗ int b = src[x+0] + ((454 * (src[x+1]-128) + 574) >> 8);
525 ✗ src[x+0] = av_clip_uint8(r);
526 ✗ src[x+1] = av_clip_uint8(g);
527 ✗ src[x+2] = av_clip_uint8(b);
528 }
529 ✗ break;
530 }
531 ✗ src += s->picture_ptr->linesize[0];
532 }
533 }else
534 ✗ avpriv_report_missing_feature(s->avctx, "16bit xfrm");
535 }
536
537
2/2
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✓ Branch 1 taken 8 times.
 213 if (shift) { /* we need to do point transform or normalize samples */
538 int x, w;
539
540 8 w = s->width * s->nb_components;
541
542
1/2
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✗ Branch 1 not taken.
 8 if (s->bits <= 8) {
543 8 uint8_t *src = s->picture_ptr->data[0];
544
545
2/2
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✓ Branch 1 taken 8 times.
 5696 for (i = 0; i < decoded_height; i++) {
546
2/2
✓ Branch 0 taken 4044168 times.
✓ Branch 1 taken 5688 times.
 4049856 for (x = off; x < w; x += stride)
547 4044168 src[x] <<= shift;
548 5688 src += s->picture_ptr->linesize[0];
549 }
550 } else {
551 ✗ uint16_t *src = (uint16_t *)s->picture_ptr->data[0];
552
553 ✗ for (i = 0; i < decoded_height; i++) {
554 ✗ for (x = 0; x < w; x++)
555 ✗ src[x] <<= shift;
556 ✗ src += s->picture_ptr->linesize[0] / 2;
557 }
558 }
559 }
560
561 205 end:
562 213 av_free(zero);
563
564 213 return ret;
565 }
566
567 const FFCodec ff_jpegls_decoder = {
568 .p.name = "jpegls",
569 CODEC_LONG_NAME("JPEG-LS"),
570 .p.type = AVMEDIA_TYPE_VIDEO,
571 .p.id = AV_CODEC_ID_JPEGLS,
572 .priv_data_size = sizeof(MJpegDecodeContext),
573 .init = ff_mjpeg_decode_init,
574 .close = ff_mjpeg_decode_end,
575 FF_CODEC_DECODE_CB(ff_mjpeg_decode_frame),
576 .p.capabilities = AV_CODEC_CAP_DR1,
577 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
578 };
579
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