FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/webp.c
Date: 2025-10-10 03:51:19
Exec Total Coverage
Lines: 614 795 77.2%
Functions: 38 41 92.7%
Branches: 257 383 67.1%
Line Branch Exec Source
1 /*
2 * WebP (.webp) image decoder
3 * Copyright (c) 2013 Aneesh Dogra <aneesh@sugarlabs.org>
4 * Copyright (c) 2013 Justin Ruggles <justin.ruggles@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 * WebP image decoder
26 *
27 * @author Aneesh Dogra <aneesh@sugarlabs.org>
28 * Container and Lossy decoding
29 *
30 * @author Justin Ruggles <justin.ruggles@gmail.com>
31 * Lossless decoder
32 * Compressed alpha for lossy
33 *
34 * @author James Almer <jamrial@gmail.com>
35 * Exif metadata
36 * ICC profile
37 *
38 * Unimplemented:
39 * - Animation
40 * - XMP metadata
41 */
42
43 #include "libavutil/imgutils.h"
44 #include "libavutil/mem.h"
45
46 #define BITSTREAM_READER_LE
47 #include "avcodec.h"
48 #include "bytestream.h"
49 #include "codec_internal.h"
50 #include "decode.h"
51 #include "exif_internal.h"
52 #include "get_bits.h"
53 #include "thread.h"
54 #include "tiff_common.h"
55 #include "vp8.h"
56
57 #define VP8X_FLAG_ANIMATION 0x02
58 #define VP8X_FLAG_XMP_METADATA 0x04
59 #define VP8X_FLAG_EXIF_METADATA 0x08
60 #define VP8X_FLAG_ALPHA 0x10
61 #define VP8X_FLAG_ICC 0x20
62
63 #define MAX_PALETTE_SIZE 256
64 #define MAX_CACHE_BITS 11
65 #define NUM_CODE_LENGTH_CODES 19
66 #define HUFFMAN_CODES_PER_META_CODE 5
67 #define NUM_LITERAL_CODES 256
68 #define NUM_LENGTH_CODES 24
69 #define NUM_DISTANCE_CODES 40
70 #define NUM_SHORT_DISTANCES 120
71 #define MAX_HUFFMAN_CODE_LENGTH 15
72
73 static const uint16_t alphabet_sizes[HUFFMAN_CODES_PER_META_CODE] = {
74 NUM_LITERAL_CODES + NUM_LENGTH_CODES,
75 NUM_LITERAL_CODES, NUM_LITERAL_CODES, NUM_LITERAL_CODES,
76 NUM_DISTANCE_CODES
77 };
78
79 static const uint8_t code_length_code_order[NUM_CODE_LENGTH_CODES] = {
80 17, 18, 0, 1, 2, 3, 4, 5, 16, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
81 };
82
83 static const int8_t lz77_distance_offsets[NUM_SHORT_DISTANCES][2] = {
84 { 0, 1 }, { 1, 0 }, { 1, 1 }, { -1, 1 }, { 0, 2 }, { 2, 0 }, { 1, 2 }, { -1, 2 },
85 { 2, 1 }, { -2, 1 }, { 2, 2 }, { -2, 2 }, { 0, 3 }, { 3, 0 }, { 1, 3 }, { -1, 3 },
86 { 3, 1 }, { -3, 1 }, { 2, 3 }, { -2, 3 }, { 3, 2 }, { -3, 2 }, { 0, 4 }, { 4, 0 },
87 { 1, 4 }, { -1, 4 }, { 4, 1 }, { -4, 1 }, { 3, 3 }, { -3, 3 }, { 2, 4 }, { -2, 4 },
88 { 4, 2 }, { -4, 2 }, { 0, 5 }, { 3, 4 }, { -3, 4 }, { 4, 3 }, { -4, 3 }, { 5, 0 },
89 { 1, 5 }, { -1, 5 }, { 5, 1 }, { -5, 1 }, { 2, 5 }, { -2, 5 }, { 5, 2 }, { -5, 2 },
90 { 4, 4 }, { -4, 4 }, { 3, 5 }, { -3, 5 }, { 5, 3 }, { -5, 3 }, { 0, 6 }, { 6, 0 },
91 { 1, 6 }, { -1, 6 }, { 6, 1 }, { -6, 1 }, { 2, 6 }, { -2, 6 }, { 6, 2 }, { -6, 2 },
92 { 4, 5 }, { -4, 5 }, { 5, 4 }, { -5, 4 }, { 3, 6 }, { -3, 6 }, { 6, 3 }, { -6, 3 },
93 { 0, 7 }, { 7, 0 }, { 1, 7 }, { -1, 7 }, { 5, 5 }, { -5, 5 }, { 7, 1 }, { -7, 1 },
94 { 4, 6 }, { -4, 6 }, { 6, 4 }, { -6, 4 }, { 2, 7 }, { -2, 7 }, { 7, 2 }, { -7, 2 },
95 { 3, 7 }, { -3, 7 }, { 7, 3 }, { -7, 3 }, { 5, 6 }, { -5, 6 }, { 6, 5 }, { -6, 5 },
96 { 8, 0 }, { 4, 7 }, { -4, 7 }, { 7, 4 }, { -7, 4 }, { 8, 1 }, { 8, 2 }, { 6, 6 },
97 { -6, 6 }, { 8, 3 }, { 5, 7 }, { -5, 7 }, { 7, 5 }, { -7, 5 }, { 8, 4 }, { 6, 7 },
98 { -6, 7 }, { 7, 6 }, { -7, 6 }, { 8, 5 }, { 7, 7 }, { -7, 7 }, { 8, 6 }, { 8, 7 }
99 };
100
101 enum AlphaCompression {
102 ALPHA_COMPRESSION_NONE,
103 ALPHA_COMPRESSION_VP8L,
104 };
105
106 enum AlphaFilter {
107 ALPHA_FILTER_NONE,
108 ALPHA_FILTER_HORIZONTAL,
109 ALPHA_FILTER_VERTICAL,
110 ALPHA_FILTER_GRADIENT,
111 };
112
113 enum TransformType {
114 PREDICTOR_TRANSFORM = 0,
115 COLOR_TRANSFORM = 1,
116 SUBTRACT_GREEN = 2,
117 COLOR_INDEXING_TRANSFORM = 3,
118 };
119
120 enum PredictionMode {
121 PRED_MODE_BLACK,
122 PRED_MODE_L,
123 PRED_MODE_T,
124 PRED_MODE_TR,
125 PRED_MODE_TL,
126 PRED_MODE_AVG_T_AVG_L_TR,
127 PRED_MODE_AVG_L_TL,
128 PRED_MODE_AVG_L_T,
129 PRED_MODE_AVG_TL_T,
130 PRED_MODE_AVG_T_TR,
131 PRED_MODE_AVG_AVG_L_TL_AVG_T_TR,
132 PRED_MODE_SELECT,
133 PRED_MODE_ADD_SUBTRACT_FULL,
134 PRED_MODE_ADD_SUBTRACT_HALF,
135 };
136
137 enum HuffmanIndex {
138 HUFF_IDX_GREEN = 0,
139 HUFF_IDX_RED = 1,
140 HUFF_IDX_BLUE = 2,
141 HUFF_IDX_ALPHA = 3,
142 HUFF_IDX_DIST = 4
143 };
144
145 /* The structure of WebP lossless is an optional series of transformation data,
146 * followed by the primary image. The primary image also optionally contains
147 * an entropy group mapping if there are multiple entropy groups. There is a
148 * basic image type called an "entropy coded image" that is used for all of
149 * these. The type of each entropy coded image is referred to by the
150 * specification as its role. */
151 enum ImageRole {
152 /* Primary Image: Stores the actual pixels of the image. */
153 IMAGE_ROLE_ARGB,
154
155 /* Entropy Image: Defines which Huffman group to use for different areas of
156 * the primary image. */
157 IMAGE_ROLE_ENTROPY,
158
159 /* Predictors: Defines which predictor type to use for different areas of
160 * the primary image. */
161 IMAGE_ROLE_PREDICTOR,
162
163 /* Color Transform Data: Defines the color transformation for different
164 * areas of the primary image. */
165 IMAGE_ROLE_COLOR_TRANSFORM,
166
167 /* Color Index: Stored as an image of height == 1. */
168 IMAGE_ROLE_COLOR_INDEXING,
169
170 IMAGE_ROLE_NB,
171 };
172
173 typedef struct HuffReader {
174 VLC vlc; /* Huffman decoder context */
175 int simple; /* whether to use simple mode */
176 int nb_symbols; /* number of coded symbols */
177 uint16_t simple_symbols[2]; /* symbols for simple mode */
178 } HuffReader;
179
180 typedef struct ImageContext {
181 enum ImageRole role; /* role of this image */
182 AVFrame *frame; /* AVFrame for data */
183 int color_cache_bits; /* color cache size, log2 */
184 uint32_t *color_cache; /* color cache data */
185 int nb_huffman_groups; /* number of huffman groups */
186 HuffReader *huffman_groups; /* reader for each huffman group */
187 /* relative size compared to primary image, log2.
188 * for IMAGE_ROLE_COLOR_INDEXING with <= 16 colors, this is log2 of the
189 * number of pixels per byte in the primary image (pixel packing) */
190 int size_reduction;
191 int is_alpha_primary;
192 } ImageContext;
193
194 typedef struct WebPContext {
195 VP8Context v; /* VP8 Context used for lossy decoding */
196 GetBitContext gb; /* bitstream reader for main image chunk */
197 AVFrame *alpha_frame; /* AVFrame for alpha data decompressed from VP8L */
198 AVPacket *pkt; /* AVPacket to be passed to the underlying VP8 decoder */
199 AVCodecContext *avctx; /* parent AVCodecContext */
200 int initialized; /* set once the VP8 context is initialized */
201 int has_alpha; /* has a separate alpha chunk */
202 enum AlphaCompression alpha_compression; /* compression type for alpha chunk */
203 enum AlphaFilter alpha_filter; /* filtering method for alpha chunk */
204 const uint8_t *alpha_data; /* alpha chunk data */
205 int alpha_data_size; /* alpha chunk data size */
206 int has_exif; /* set after an EXIF chunk has been processed */
207 int has_iccp; /* set after an ICCP chunk has been processed */
208 int width; /* image width */
209 int height; /* image height */
210 int lossless; /* indicates lossless or lossy */
211
212 int nb_transforms; /* number of transforms */
213 enum TransformType transforms[4]; /* transformations used in the image, in order */
214 /* reduced width when using a color indexing transform with <= 16 colors (pixel packing)
215 * before pixels are unpacked, or same as width otherwise. */
216 int reduced_width;
217 int nb_huffman_groups; /* number of huffman groups in the primary image */
218 ImageContext image[IMAGE_ROLE_NB]; /* image context for each role */
219 } WebPContext;
220
221 #define GET_PIXEL(frame, x, y) \
222 ((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x))
223
224 #define GET_PIXEL_COMP(frame, x, y, c) \
225 (*((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x) + c))
226
227 60 static void image_ctx_free(ImageContext *img)
228 {
229 int i, j;
230
231 60 av_free(img->color_cache);
232
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 60 if (img->role != IMAGE_ROLE_ARGB && !img->is_alpha_primary)
233 22 av_frame_free(&img->frame);
234
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 60 if (img->huffman_groups) {
235
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 76 for (i = 0; i < img->nb_huffman_groups; i++) {
236
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 252 for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++)
237 210 ff_vlc_free(&img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE + j].vlc);
238 }
239 34 av_free(img->huffman_groups);
240 }
241 60 memset(img, 0, sizeof(*img));
242 60 }
243
244 280428 static int huff_reader_get_symbol(HuffReader *r, GetBitContext *gb)
245 {
246
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 280428 if (r->simple) {
247
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 73834 if (r->nb_symbols == 1)
248 73514 return r->simple_symbols[0];
249 else
250 320 return r->simple_symbols[get_bits1(gb)];
251 } else
252 206594 return get_vlc2(gb, r->vlc.table, 8, 2);
253 }
254
255 160 static int huff_reader_build_canonical(HuffReader *r, const uint8_t *code_lengths,
256 uint16_t len_counts[MAX_HUFFMAN_CODE_LENGTH + 1],
257 uint8_t lens[], uint16_t syms[],
258 int alphabet_size, void *logctx)
259 {
260 160 unsigned nb_codes = 0;
261 int ret;
262
263 // Count the number of symbols of each length and transform len_counts
264 // into an array of offsets.
265
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 2560 for (int len = 1; len <= MAX_HUFFMAN_CODE_LENGTH; ++len) {
266 2400 unsigned cnt = len_counts[len];
267 2400 len_counts[len] = nb_codes;
268 2400 nb_codes += cnt;
269 }
270
271
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 22210 for (int sym = 0; sym < alphabet_size; ++sym) {
272
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 22050 if (code_lengths[sym]) {
273 7476 unsigned idx = len_counts[code_lengths[sym]]++;
274 7476 syms[idx] = sym;
275 7476 lens[idx] = code_lengths[sym];
276 }
277 }
278
279
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 160 if (nb_codes == 0) {
280 // No symbols
281 ✗ return AVERROR_INVALIDDATA;
282 }
283
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 160 if (nb_codes == 1) {
284 // Special-case 1 symbol since the VLC reader cannot handle it
285 ✗ r->nb_symbols = 1;
286 ✗ r->simple = 1;
287 ✗ r->simple_symbols[0] = syms[0];
288 ✗ return 0;
289 }
290
291 160 ret = ff_vlc_init_from_lengths(&r->vlc, 8, nb_codes, lens, 1,
292 syms, 2, 2, 0, VLC_INIT_OUTPUT_LE, logctx);
293
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 160 if (ret < 0)
294 ✗ return ret;
295 160 r->simple = 0;
296
297 160 return 0;
298 }
299
300 130 static void read_huffman_code_simple(WebPContext *s, HuffReader *hc)
301 {
302 130 hc->nb_symbols = get_bits1(&s->gb) + 1;
303
304
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 130 if (get_bits1(&s->gb))
305 18 hc->simple_symbols[0] = get_bits(&s->gb, 8);
306 else
307 112 hc->simple_symbols[0] = get_bits1(&s->gb);
308
309
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 130 if (hc->nb_symbols == 2)
310 14 hc->simple_symbols[1] = get_bits(&s->gb, 8);
311
312 130 hc->simple = 1;
313 130 }
314
315 80 static int read_huffman_code_normal(WebPContext *s, HuffReader *hc,
316 int alphabet_size)
317 {
318 80 HuffReader code_len_hc = { { 0 }, 0, 0, { 0 } };
319 uint8_t *code_lengths;
320 80 uint8_t code_length_code_lengths[NUM_CODE_LENGTH_CODES] = { 0 };
321 uint8_t reordered_code_length_code_lengths[NUM_CODE_LENGTH_CODES];
322 uint16_t reordered_code_length_syms[NUM_CODE_LENGTH_CODES];
323 80 uint16_t len_counts[MAX_HUFFMAN_CODE_LENGTH + 1] = { 0 };
324 int symbol, max_symbol, prev_code_len, ret;
325 80 int num_codes = 4 + get_bits(&s->gb, 4);
326
327 av_assert1(num_codes <= NUM_CODE_LENGTH_CODES);
328
329
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 1180 for (int i = 0; i < num_codes; i++) {
330 1100 unsigned len = get_bits(&s->gb, 3);
331 1100 code_length_code_lengths[code_length_code_order[i]] = len;
332 1100 len_counts[len]++;
333 }
334
335
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 80 if (get_bits1(&s->gb)) {
336 8 int bits = 2 + 2 * get_bits(&s->gb, 3);
337 8 max_symbol = 2 + get_bits(&s->gb, bits);
338
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 8 if (max_symbol > alphabet_size) {
339 ✗ av_log(s->avctx, AV_LOG_ERROR, "max symbol %d > alphabet size %d\n",
340 max_symbol, alphabet_size);
341 ✗ return AVERROR_INVALIDDATA;
342 }
343 } else {
344 72 max_symbol = alphabet_size;
345 }
346
347 80 ret = huff_reader_build_canonical(&code_len_hc, code_length_code_lengths, len_counts,
348 reordered_code_length_code_lengths,
349 reordered_code_length_syms,
350 80 NUM_CODE_LENGTH_CODES, s->avctx);
351
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 80 if (ret < 0)
352 ✗ return ret;
353
354 80 code_lengths = av_malloc_array(alphabet_size, 2 * sizeof(uint8_t) + sizeof(uint16_t));
355
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 80 if (!code_lengths) {
356 ✗ ret = AVERROR(ENOMEM);
357 ✗ goto finish;
358 }
359
360 80 prev_code_len = 8;
361 80 symbol = 0;
362 80 memset(len_counts, 0, sizeof(len_counts));
363
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 3336 while (symbol < alphabet_size) {
364 int code_len;
365
366
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 3264 if (!max_symbol--)
367 8 break;
368 3256 code_len = huff_reader_get_symbol(&code_len_hc, &s->gb);
369
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 3256 if (code_len < 16U) {
370 /* Code length code [0..15] indicates literal code lengths. */
371 1938 code_lengths[symbol++] = code_len;
372 1938 len_counts[code_len]++;
373
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 1938 if (code_len)
374 1818 prev_code_len = code_len;
375 } else {
376 1318 int repeat = 0, length = 0;
377
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 1318 switch (code_len) {
378 ✗ default:
379 ✗ ret = AVERROR_INVALIDDATA;
380 ✗ goto finish;
381 888 case 16:
382 /* Code 16 repeats the previous non-zero value [3..6] times,
383 * i.e., 3 + ReadBits(2) times. If code 16 is used before a
384 * non-zero value has been emitted, a value of 8 is repeated. */
385 888 repeat = 3 + get_bits(&s->gb, 2);
386 888 length = prev_code_len;
387 888 len_counts[length] += repeat;
388 888 break;
389 160 case 17:
390 /* Code 17 emits a streak of zeros [3..10], i.e.,
391 * 3 + ReadBits(3) times. */
392 160 repeat = 3 + get_bits(&s->gb, 3);
393 160 break;
394 270 case 18:
395 /* Code 18 emits a streak of zeros of length [11..138], i.e.,
396 * 11 + ReadBits(7) times. */
397 270 repeat = 11 + get_bits(&s->gb, 7);
398 270 break;
399 }
400
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 1318 if (symbol + repeat > alphabet_size) {
401 ✗ av_log(s->avctx, AV_LOG_ERROR,
402 "invalid symbol %d + repeat %d > alphabet size %d\n",
403 symbol, repeat, alphabet_size);
404 ✗ ret = AVERROR_INVALIDDATA;
405 ✗ goto finish;
406 }
407
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 19910 while (repeat-- > 0)
408 18592 code_lengths[symbol++] = length;
409 }
410 }
411
412 80 ret = huff_reader_build_canonical(hc, code_lengths, len_counts,
413 code_lengths + symbol,
414 80 (uint16_t*)(code_lengths + 2 * symbol),
415 80 symbol, s->avctx);
416
417 80 finish:
418 80 ff_vlc_free(&code_len_hc.vlc);
419 80 av_free(code_lengths);
420 80 return ret;
421 }
422
423 static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role,
424 int w, int h);
425
426 #define PARSE_BLOCK_SIZE(w, h) do { \
427 block_bits = get_bits(&s->gb, 3) + 2; \
428 blocks_w = FFALIGN((w), 1 << block_bits) >> block_bits; \
429 blocks_h = FFALIGN((h), 1 << block_bits) >> block_bits; \
430 } while (0)
431
432 4 static int decode_entropy_image(WebPContext *s)
433 {
434 ImageContext *img;
435 int ret, block_bits, blocks_w, blocks_h, x, y, max;
436
437 4 PARSE_BLOCK_SIZE(s->reduced_width, s->height);
438
439 4 ret = decode_entropy_coded_image(s, IMAGE_ROLE_ENTROPY, blocks_w, blocks_h);
440
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 4 if (ret < 0)
441 ✗ return ret;
442
443 4 img = &s->image[IMAGE_ROLE_ENTROPY];
444 4 img->size_reduction = block_bits;
445
446 /* the number of huffman groups is determined by the maximum group number
447 * coded in the entropy image */
448 4 max = 0;
449
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 68 for (y = 0; y < img->frame->height; y++) {
450
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 1088 for (x = 0; x < img->frame->width; x++) {
451 1024 int p0 = GET_PIXEL_COMP(img->frame, x, y, 1);
452 1024 int p1 = GET_PIXEL_COMP(img->frame, x, y, 2);
453 1024 int p = p0 << 8 | p1;
454 1024 max = FFMAX(max, p);
455 }
456 }
457 4 s->nb_huffman_groups = max + 1;
458
459 4 return 0;
460 }
461
462 6 static int parse_transform_predictor(WebPContext *s)
463 {
464 int block_bits, blocks_w, blocks_h, ret;
465
466 6 PARSE_BLOCK_SIZE(s->reduced_width, s->height);
467
468 6 ret = decode_entropy_coded_image(s, IMAGE_ROLE_PREDICTOR, blocks_w,
469 blocks_h);
470
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 6 if (ret < 0)
471 ✗ return ret;
472
473 6 s->image[IMAGE_ROLE_PREDICTOR].size_reduction = block_bits;
474
475 6 return 0;
476 }
477
478 4 static int parse_transform_color(WebPContext *s)
479 {
480 int block_bits, blocks_w, blocks_h, ret;
481
482 4 PARSE_BLOCK_SIZE(s->reduced_width, s->height);
483
484 4 ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_TRANSFORM, blocks_w,
485 blocks_h);
486
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 4 if (ret < 0)
487 ✗ return ret;
488
489 4 s->image[IMAGE_ROLE_COLOR_TRANSFORM].size_reduction = block_bits;
490
491 4 return 0;
492 }
493
494 8 static int parse_transform_color_indexing(WebPContext *s)
495 {
496 ImageContext *img;
497 int width_bits, index_size, ret, x;
498 uint8_t *ct;
499
500 8 index_size = get_bits(&s->gb, 8) + 1;
501
502
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 8 if (index_size <= 2)
503 2 width_bits = 3;
504
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 6 else if (index_size <= 4)
505 2 width_bits = 2;
506
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 4 else if (index_size <= 16)
507 ✗ width_bits = 1;
508 else
509 4 width_bits = 0;
510
511 8 ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_INDEXING,
512 index_size, 1);
513
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 8 if (ret < 0)
514 ✗ return ret;
515
516 8 img = &s->image[IMAGE_ROLE_COLOR_INDEXING];
517 8 img->size_reduction = width_bits;
518
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 8 if (width_bits > 0)
519 4 s->reduced_width = (s->width + ((1 << width_bits) - 1)) >> width_bits;
520
521 /* color index values are delta-coded */
522 8 ct = img->frame->data[0] + 4;
523
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 1432 for (x = 4; x < img->frame->width * 4; x++, ct++)
524 1424 ct[0] += ct[-4];
525
526 8 return 0;
527 }
528
529 69356 static HuffReader *get_huffman_group(WebPContext *s, ImageContext *img,
530 int x, int y)
531 {
532 69356 ImageContext *gimg = &s->image[IMAGE_ROLE_ENTROPY];
533 69356 int group = 0;
534
535
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 69356 if (gimg->size_reduction > 0) {
536 65536 int group_x = x >> gimg->size_reduction;
537 65536 int group_y = y >> gimg->size_reduction;
538 65536 int g0 = GET_PIXEL_COMP(gimg->frame, group_x, group_y, 1);
539 65536 int g1 = GET_PIXEL_COMP(gimg->frame, group_x, group_y, 2);
540 65536 group = g0 << 8 | g1;
541 }
542
543 69356 return &img->huffman_groups[group * HUFFMAN_CODES_PER_META_CODE];
544 }
545
546 ✗ static av_always_inline void color_cache_put(ImageContext *img, uint32_t c)
547 {
548 ✗ uint32_t cache_idx = (0x1E35A7BD * c) >> (32 - img->color_cache_bits);
549 ✗ img->color_cache[cache_idx] = c;
550 ✗ }
551
552 34 static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role,
553 int w, int h)
554 {
555 ImageContext *img;
556 HuffReader *hg;
557 int i, j, ret, x, y, width;
558
559 34 img = &s->image[role];
560 34 img->role = role;
561
562
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 34 if (!img->frame) {
563 22 img->frame = av_frame_alloc();
564
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 22 if (!img->frame)
565 ✗ return AVERROR(ENOMEM);
566 }
567
568 34 img->frame->format = AV_PIX_FMT_ARGB;
569 34 img->frame->width = w;
570 34 img->frame->height = h;
571
572
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 34 if (role == IMAGE_ROLE_ARGB && !img->is_alpha_primary) {
573 10 ret = ff_thread_get_buffer(s->avctx, img->frame, 0);
574 } else
575 24 ret = av_frame_get_buffer(img->frame, 1);
576
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 34 if (ret < 0)
577 ✗ return ret;
578
579
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 34 if (get_bits1(&s->gb)) {
580 ✗ img->color_cache_bits = get_bits(&s->gb, 4);
581 ✗ if (img->color_cache_bits < 1 || img->color_cache_bits > 11) {
582 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid color cache bits: %d\n",
583 img->color_cache_bits);
584 ✗ return AVERROR_INVALIDDATA;
585 }
586 ✗ img->color_cache = av_calloc(1 << img->color_cache_bits,
587 sizeof(*img->color_cache));
588 ✗ if (!img->color_cache)
589 ✗ return AVERROR(ENOMEM);
590 } else {
591 34 img->color_cache_bits = 0;
592 }
593
594 34 img->nb_huffman_groups = 1;
595
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 34 if (role == IMAGE_ROLE_ARGB && get_bits1(&s->gb)) {
596 4 ret = decode_entropy_image(s);
597
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 4 if (ret < 0)
598 ✗ return ret;
599 4 img->nb_huffman_groups = s->nb_huffman_groups;
600 }
601 34 img->huffman_groups = av_calloc(img->nb_huffman_groups,
602 HUFFMAN_CODES_PER_META_CODE *
603 sizeof(*img->huffman_groups));
604
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 34 if (!img->huffman_groups)
605 ✗ return AVERROR(ENOMEM);
606
607
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 76 for (i = 0; i < img->nb_huffman_groups; i++) {
608 42 hg = &img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE];
609
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 252 for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++) {
610 210 int alphabet_size = alphabet_sizes[j];
611
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 210 if (!j && img->color_cache_bits > 0)
612 ✗ alphabet_size += 1 << img->color_cache_bits;
613
614
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 210 if (get_bits1(&s->gb)) {
615 130 read_huffman_code_simple(s, &hg[j]);
616 } else {
617 80 ret = read_huffman_code_normal(s, &hg[j], alphabet_size);
618
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 80 if (ret < 0)
619 ✗ return ret;
620 }
621 }
622 }
623
624 34 width = img->frame->width;
625
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 34 if (role == IMAGE_ROLE_ARGB)
626 12 width = s->reduced_width;
627
628 34 x = 0; y = 0;
629
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 69390 while (y < img->frame->height) {
630 int v;
631
632
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 69356 if (get_bits_left(&s->gb) < 0)
633 ✗ return AVERROR_INVALIDDATA;
634
635 69356 hg = get_huffman_group(s, img, x, y);
636 69356 v = huff_reader_get_symbol(&hg[HUFF_IDX_GREEN], &s->gb);
637
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 69356 if (v < NUM_LITERAL_CODES) {
638 /* literal pixel values */
639 69230 uint8_t *p = GET_PIXEL(img->frame, x, y);
640 69230 p[2] = v;
641 69230 p[1] = huff_reader_get_symbol(&hg[HUFF_IDX_RED], &s->gb);
642 69230 p[3] = huff_reader_get_symbol(&hg[HUFF_IDX_BLUE], &s->gb);
643 69230 p[0] = huff_reader_get_symbol(&hg[HUFF_IDX_ALPHA], &s->gb);
644
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 69230 if (img->color_cache_bits)
645 ✗ color_cache_put(img, AV_RB32(p));
646 69230 x++;
647
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 69230 if (x == width) {
648 750 x = 0;
649 750 y++;
650 }
651
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 126 } else if (v < NUM_LITERAL_CODES + NUM_LENGTH_CODES) {
652 /* LZ77 backwards mapping */
653 int prefix_code, length, distance, ref_x, ref_y;
654
655 /* parse length and distance */
656 126 prefix_code = v - NUM_LITERAL_CODES;
657
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 126 if (prefix_code < 4) {
658 48 length = prefix_code + 1;
659 } else {
660 78 int extra_bits = (prefix_code - 2) >> 1;
661 78 int offset = 2 + (prefix_code & 1) << extra_bits;
662 78 length = offset + get_bits(&s->gb, extra_bits) + 1;
663 }
664 126 prefix_code = huff_reader_get_symbol(&hg[HUFF_IDX_DIST], &s->gb);
665
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 126 if (prefix_code > 39U) {
666 ✗ av_log(s->avctx, AV_LOG_ERROR,
667 "distance prefix code too large: %d\n", prefix_code);
668 ✗ return AVERROR_INVALIDDATA;
669 }
670
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 126 if (prefix_code < 4) {
671 126 distance = prefix_code + 1;
672 } else {
673 ✗ int extra_bits = prefix_code - 2 >> 1;
674 ✗ int offset = 2 + (prefix_code & 1) << extra_bits;
675 ✗ distance = offset + get_bits(&s->gb, extra_bits) + 1;
676 }
677
678 /* find reference location */
679
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 126 if (distance <= NUM_SHORT_DISTANCES) {
680 126 int xi = lz77_distance_offsets[distance - 1][0];
681 126 int yi = lz77_distance_offsets[distance - 1][1];
682 126 distance = FFMAX(1, xi + yi * width);
683 } else {
684 ✗ distance -= NUM_SHORT_DISTANCES;
685 }
686 126 ref_x = x;
687 126 ref_y = y;
688
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 126 if (distance <= x) {
689 40 ref_x -= distance;
690 40 distance = 0;
691 } else {
692 86 ref_x = 0;
693 86 distance -= x;
694 }
695
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 148 while (distance >= width) {
696 22 ref_y--;
697 22 distance -= width;
698 }
699
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 126 if (distance > 0) {
700 64 ref_x = width - distance;
701 64 ref_y--;
702 }
703 126 ref_x = FFMAX(0, ref_x);
704 126 ref_y = FFMAX(0, ref_y);
705
706
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 126 if (ref_y == y && ref_x >= x)
707 ✗ return AVERROR_INVALIDDATA;
708
709 /* copy pixels
710 * source and dest regions can overlap and wrap lines, so just
711 * copy per-pixel */
712
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 1076 for (i = 0; i < length; i++) {
713 958 uint8_t *p_ref = GET_PIXEL(img->frame, ref_x, ref_y);
714 958 uint8_t *p = GET_PIXEL(img->frame, x, y);
715
716 958 AV_COPY32(p, p_ref);
717
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 958 if (img->color_cache_bits)
718 ✗ color_cache_put(img, AV_RB32(p));
719 958 x++;
720 958 ref_x++;
721
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 958 if (x == width) {
722 74 x = 0;
723 74 y++;
724 }
725
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 958 if (ref_x == width) {
726 72 ref_x = 0;
727 72 ref_y++;
728 }
729
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 958 if (y == img->frame->height || ref_y == img->frame->height)
730 break;
731 }
732 } else {
733 /* read from color cache */
734 ✗ uint8_t *p = GET_PIXEL(img->frame, x, y);
735 ✗ int cache_idx = v - (NUM_LITERAL_CODES + NUM_LENGTH_CODES);
736
737 ✗ if (!img->color_cache_bits) {
738 ✗ av_log(s->avctx, AV_LOG_ERROR, "color cache not found\n");
739 ✗ return AVERROR_INVALIDDATA;
740 }
741 ✗ if (cache_idx >= 1 << img->color_cache_bits) {
742 ✗ av_log(s->avctx, AV_LOG_ERROR,
743 "color cache index out-of-bounds\n");
744 ✗ return AVERROR_INVALIDDATA;
745 }
746 ✗ AV_WB32(p, img->color_cache[cache_idx]);
747 ✗ x++;
748 ✗ if (x == width) {
749 ✗ x = 0;
750 ✗ y++;
751 }
752 }
753 }
754
755 34 return 0;
756 }
757
758 /* PRED_MODE_BLACK */
759 6 static void inv_predict_0(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
760 const uint8_t *p_t, const uint8_t *p_tr)
761 {
762 6 AV_WB32(p, 0xFF000000);
763 6 }
764
765 /* PRED_MODE_L */
766 5300 static void inv_predict_1(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
767 const uint8_t *p_t, const uint8_t *p_tr)
768 {
769 5300 AV_COPY32(p, p_l);
770 5300 }
771
772 /* PRED_MODE_T */
773 21182 static void inv_predict_2(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
774 const uint8_t *p_t, const uint8_t *p_tr)
775 {
776 21182 AV_COPY32(p, p_t);
777 21182 }
778
779 /* PRED_MODE_TR */
780 6336 static void inv_predict_3(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
781 const uint8_t *p_t, const uint8_t *p_tr)
782 {
783 6336 AV_COPY32(p, p_tr);
784 6336 }
785
786 /* PRED_MODE_TL */
787 1248 static void inv_predict_4(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
788 const uint8_t *p_t, const uint8_t *p_tr)
789 {
790 1248 AV_COPY32(p, p_tl);
791 1248 }
792
793 /* PRED_MODE_AVG_T_AVG_L_TR */
794 4832 static void inv_predict_5(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
795 const uint8_t *p_t, const uint8_t *p_tr)
796 {
797 4832 p[0] = p_t[0] + (p_l[0] + p_tr[0] >> 1) >> 1;
798 4832 p[1] = p_t[1] + (p_l[1] + p_tr[1] >> 1) >> 1;
799 4832 p[2] = p_t[2] + (p_l[2] + p_tr[2] >> 1) >> 1;
800 4832 p[3] = p_t[3] + (p_l[3] + p_tr[3] >> 1) >> 1;
801 4832 }
802
803 /* PRED_MODE_AVG_L_TL */
804 768 static void inv_predict_6(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
805 const uint8_t *p_t, const uint8_t *p_tr)
806 {
807 768 p[0] = p_l[0] + p_tl[0] >> 1;
808 768 p[1] = p_l[1] + p_tl[1] >> 1;
809 768 p[2] = p_l[2] + p_tl[2] >> 1;
810 768 p[3] = p_l[3] + p_tl[3] >> 1;
811 768 }
812
813 /* PRED_MODE_AVG_L_T */
814 3072 static void inv_predict_7(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
815 const uint8_t *p_t, const uint8_t *p_tr)
816 {
817 3072 p[0] = p_l[0] + p_t[0] >> 1;
818 3072 p[1] = p_l[1] + p_t[1] >> 1;
819 3072 p[2] = p_l[2] + p_t[2] >> 1;
820 3072 p[3] = p_l[3] + p_t[3] >> 1;
821 3072 }
822
823 /* PRED_MODE_AVG_TL_T */
824 4512 static void inv_predict_8(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
825 const uint8_t *p_t, const uint8_t *p_tr)
826 {
827 4512 p[0] = p_tl[0] + p_t[0] >> 1;
828 4512 p[1] = p_tl[1] + p_t[1] >> 1;
829 4512 p[2] = p_tl[2] + p_t[2] >> 1;
830 4512 p[3] = p_tl[3] + p_t[3] >> 1;
831 4512 }
832
833 /* PRED_MODE_AVG_T_TR */
834 11488 static void inv_predict_9(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
835 const uint8_t *p_t, const uint8_t *p_tr)
836 {
837 11488 p[0] = p_t[0] + p_tr[0] >> 1;
838 11488 p[1] = p_t[1] + p_tr[1] >> 1;
839 11488 p[2] = p_t[2] + p_tr[2] >> 1;
840 11488 p[3] = p_t[3] + p_tr[3] >> 1;
841 11488 }
842
843 /* PRED_MODE_AVG_AVG_L_TL_AVG_T_TR */
844 3236 static void inv_predict_10(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
845 const uint8_t *p_t, const uint8_t *p_tr)
846 {
847 3236 p[0] = (p_l[0] + p_tl[0] >> 1) + (p_t[0] + p_tr[0] >> 1) >> 1;
848 3236 p[1] = (p_l[1] + p_tl[1] >> 1) + (p_t[1] + p_tr[1] >> 1) >> 1;
849 3236 p[2] = (p_l[2] + p_tl[2] >> 1) + (p_t[2] + p_tr[2] >> 1) >> 1;
850 3236 p[3] = (p_l[3] + p_tl[3] >> 1) + (p_t[3] + p_tr[3] >> 1) >> 1;
851 3236 }
852
853 /* PRED_MODE_SELECT */
854 3824 static void inv_predict_11(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
855 const uint8_t *p_t, const uint8_t *p_tr)
856 {
857 3824 int diff = (FFABS(p_l[0] - p_tl[0]) - FFABS(p_t[0] - p_tl[0])) +
858 3824 (FFABS(p_l[1] - p_tl[1]) - FFABS(p_t[1] - p_tl[1])) +
859 3824 (FFABS(p_l[2] - p_tl[2]) - FFABS(p_t[2] - p_tl[2])) +
860 3824 (FFABS(p_l[3] - p_tl[3]) - FFABS(p_t[3] - p_tl[3]));
861
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 3824 if (diff <= 0)
862 2602 AV_COPY32(p, p_t);
863 else
864 1222 AV_COPY32(p, p_l);
865 3824 }
866
867 /* PRED_MODE_ADD_SUBTRACT_FULL */
868 ✗ static void inv_predict_12(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
869 const uint8_t *p_t, const uint8_t *p_tr)
870 {
871 ✗ p[0] = av_clip_uint8(p_l[0] + p_t[0] - p_tl[0]);
872 ✗ p[1] = av_clip_uint8(p_l[1] + p_t[1] - p_tl[1]);
873 ✗ p[2] = av_clip_uint8(p_l[2] + p_t[2] - p_tl[2]);
874 ✗ p[3] = av_clip_uint8(p_l[3] + p_t[3] - p_tl[3]);
875 ✗ }
876
877 2048 static av_always_inline uint8_t clamp_add_subtract_half(int a, int b, int c)
878 {
879 2048 int d = a + b >> 1;
880 2048 return av_clip_uint8(d + (d - c) / 2);
881 }
882
883 /* PRED_MODE_ADD_SUBTRACT_HALF */
884 512 static void inv_predict_13(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
885 const uint8_t *p_t, const uint8_t *p_tr)
886 {
887 512 p[0] = clamp_add_subtract_half(p_l[0], p_t[0], p_tl[0]);
888 512 p[1] = clamp_add_subtract_half(p_l[1], p_t[1], p_tl[1]);
889 512 p[2] = clamp_add_subtract_half(p_l[2], p_t[2], p_tl[2]);
890 512 p[3] = clamp_add_subtract_half(p_l[3], p_t[3], p_tl[3]);
891 512 }
892
893 typedef void (*inv_predict_func)(uint8_t *p, const uint8_t *p_l,
894 const uint8_t *p_tl, const uint8_t *p_t,
895 const uint8_t *p_tr);
896
897 static const inv_predict_func inverse_predict[14] = {
898 inv_predict_0, inv_predict_1, inv_predict_2, inv_predict_3,
899 inv_predict_4, inv_predict_5, inv_predict_6, inv_predict_7,
900 inv_predict_8, inv_predict_9, inv_predict_10, inv_predict_11,
901 inv_predict_12, inv_predict_13,
902 };
903
904 66316 static void inverse_prediction(AVFrame *frame, enum PredictionMode m, int x, int y)
905 {
906 uint8_t *dec, *p_l, *p_tl, *p_t, *p_tr;
907 uint8_t p[4];
908
909 66316 dec = GET_PIXEL(frame, x, y);
910 66316 p_l = GET_PIXEL(frame, x - 1, y);
911 66316 p_tl = GET_PIXEL(frame, x - 1, y - 1);
912 66316 p_t = GET_PIXEL(frame, x, y - 1);
913
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 66316 if (x == frame->width - 1)
914 512 p_tr = GET_PIXEL(frame, 0, y);
915 else
916 65804 p_tr = GET_PIXEL(frame, x + 1, y - 1);
917
918 66316 inverse_predict[m](p, p_l, p_tl, p_t, p_tr);
919
920 66316 dec[0] += p[0];
921 66316 dec[1] += p[1];
922 66316 dec[2] += p[2];
923 66316 dec[3] += p[3];
924 66316 }
925
926 6 static int apply_predictor_transform(WebPContext *s)
927 {
928 6 ImageContext *img = &s->image[IMAGE_ROLE_ARGB];
929 6 ImageContext *pimg = &s->image[IMAGE_ROLE_PREDICTOR];
930 int x, y;
931
932
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 578 for (y = 0; y < img->frame->height; y++) {
933
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 66888 for (x = 0; x < s->reduced_width; x++) {
934 66316 int tx = x >> pimg->size_reduction;
935 66316 int ty = y >> pimg->size_reduction;
936 66316 enum PredictionMode m = GET_PIXEL_COMP(pimg->frame, tx, ty, 2);
937
938
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 66316 if (x == 0) {
939
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 572 if (y == 0)
940 6 m = PRED_MODE_BLACK;
941 else
942 566 m = PRED_MODE_T;
943
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 65744 } else if (y == 0)
944 532 m = PRED_MODE_L;
945
946
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 66316 if (m > 13) {
947 ✗ av_log(s->avctx, AV_LOG_ERROR,
948 "invalid predictor mode: %d\n", m);
949 ✗ return AVERROR_INVALIDDATA;
950 }
951 66316 inverse_prediction(img->frame, m, x, y);
952 }
953 }
954 6 return 0;
955 }
956
957 196608 static av_always_inline uint8_t color_transform_delta(uint8_t color_pred,
958 uint8_t color)
959 {
960 196608 return (int)ff_u8_to_s8(color_pred) * ff_u8_to_s8(color) >> 5;
961 }
962
963 4 static int apply_color_transform(WebPContext *s)
964 {
965 ImageContext *img, *cimg;
966 int x, y, cx, cy;
967 uint8_t *p, *cp;
968
969 4 img = &s->image[IMAGE_ROLE_ARGB];
970 4 cimg = &s->image[IMAGE_ROLE_COLOR_TRANSFORM];
971
972
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 516 for (y = 0; y < img->frame->height; y++) {
973
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 66048 for (x = 0; x < s->reduced_width; x++) {
974 65536 cx = x >> cimg->size_reduction;
975 65536 cy = y >> cimg->size_reduction;
976 65536 cp = GET_PIXEL(cimg->frame, cx, cy);
977 65536 p = GET_PIXEL(img->frame, x, y);
978
979 65536 p[1] += color_transform_delta(cp[3], p[2]);
980 65536 p[3] += color_transform_delta(cp[2], p[2]) +
981 65536 color_transform_delta(cp[1], p[1]);
982 }
983 }
984 4 return 0;
985 }
986
987 4 static int apply_subtract_green_transform(WebPContext *s)
988 {
989 int x, y;
990 4 ImageContext *img = &s->image[IMAGE_ROLE_ARGB];
991
992
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 516 for (y = 0; y < img->frame->height; y++) {
993
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 66048 for (x = 0; x < s->reduced_width; x++) {
994 65536 uint8_t *p = GET_PIXEL(img->frame, x, y);
995 65536 p[1] += p[2];
996 65536 p[3] += p[2];
997 }
998 }
999 4 return 0;
1000 }
1001
1002 8 static int apply_color_indexing_transform(WebPContext *s)
1003 {
1004 ImageContext *img;
1005 ImageContext *pal;
1006 int i, x, y;
1007 uint8_t *p;
1008
1009 8 img = &s->image[IMAGE_ROLE_ARGB];
1010 8 pal = &s->image[IMAGE_ROLE_COLOR_INDEXING];
1011
1012
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 8 if (pal->size_reduction > 0) { // undo pixel packing
1013 GetBitContext gb_g;
1014 uint8_t *line;
1015 4 int pixel_bits = 8 >> pal->size_reduction;
1016
1017 4 line = av_malloc(img->frame->linesize[0] + AV_INPUT_BUFFER_PADDING_SIZE);
1018
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 4 if (!line)
1019 ✗ return AVERROR(ENOMEM);
1020
1021
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 80 for (y = 0; y < img->frame->height; y++) {
1022 76 p = GET_PIXEL(img->frame, 0, y);
1023 76 memcpy(line, p, img->frame->linesize[0]);
1024 76 init_get_bits(&gb_g, line, img->frame->linesize[0] * 8);
1025 76 skip_bits(&gb_g, 16);
1026 76 i = 0;
1027
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 6268 for (x = 0; x < img->frame->width; x++) {
1028 6192 p = GET_PIXEL(img->frame, x, y);
1029 6192 p[2] = get_bits(&gb_g, pixel_bits);
1030 6192 i++;
1031
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 6192 if (i == 1 << pal->size_reduction) {
1032 768 skip_bits(&gb_g, 24);
1033 768 i = 0;
1034 }
1035 }
1036 }
1037 4 av_free(line);
1038 4 s->reduced_width = s->width; // we are back to full size
1039 }
1040
1041 // switch to local palette if it's worth initializing it
1042
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 8 if (img->frame->height * img->frame->width > 300) {
1043 uint8_t palette[256 * 4];
1044 2 const int size = pal->frame->width * 4;
1045
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 2 av_assert0(size <= 1024U);
1046 2 memcpy(palette, GET_PIXEL(pal->frame, 0, 0), size); // copy palette
1047 // set extra entries to transparent black
1048 2 memset(palette + size, 0, 256 * 4 - size);
1049
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 62 for (y = 0; y < img->frame->height; y++) {
1050
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 6060 for (x = 0; x < img->frame->width; x++) {
1051 6000 p = GET_PIXEL(img->frame, x, y);
1052 6000 i = p[2];
1053 6000 AV_COPY32(p, &palette[i * 4]);
1054 }
1055 }
1056 } else {
1057
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 54 for (y = 0; y < img->frame->height; y++) {
1058
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 624 for (x = 0; x < img->frame->width; x++) {
1059 576 p = GET_PIXEL(img->frame, x, y);
1060 576 i = p[2];
1061
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 576 if (i >= pal->frame->width) {
1062 ✗ AV_WB32(p, 0x00000000);
1063 } else {
1064 576 const uint8_t *pi = GET_PIXEL(pal->frame, i, 0);
1065 576 AV_COPY32(p, pi);
1066 }
1067 }
1068 }
1069 }
1070
1071 8 return 0;
1072 }
1073
1074 16 static void update_canvas_size(AVCodecContext *avctx, int w, int h)
1075 {
1076 16 WebPContext *s = avctx->priv_data;
1077
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 16 if (s->width && s->width != w) {
1078 ✗ av_log(avctx, AV_LOG_WARNING, "Width mismatch. %d != %d\n",
1079 s->width, w);
1080 }
1081 16 s->width = w;
1082
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 16 if (s->height && s->height != h) {
1083 ✗ av_log(avctx, AV_LOG_WARNING, "Height mismatch. %d != %d\n",
1084 s->height, h);
1085 }
1086 16 s->height = h;
1087 16 }
1088
1089 12 static int vp8_lossless_decode_frame(AVCodecContext *avctx, AVFrame *p,
1090 int *got_frame, const uint8_t *data_start,
1091 unsigned int data_size, int is_alpha_chunk)
1092 {
1093 12 WebPContext *s = avctx->priv_data;
1094 int w, h, ret, i, used;
1095
1096
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 12 if (!is_alpha_chunk) {
1097 10 s->lossless = 1;
1098 10 avctx->pix_fmt = AV_PIX_FMT_ARGB;
1099 }
1100
1101 12 ret = init_get_bits8(&s->gb, data_start, data_size);
1102
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 12 if (ret < 0)
1103 ✗ return ret;
1104
1105
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 12 if (!is_alpha_chunk) {
1106
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 10 if (get_bits(&s->gb, 8) != 0x2F) {
1107 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid WebP Lossless signature\n");
1108 ✗ return AVERROR_INVALIDDATA;
1109 }
1110
1111 10 w = get_bits(&s->gb, 14) + 1;
1112 10 h = get_bits(&s->gb, 14) + 1;
1113
1114 10 update_canvas_size(avctx, w, h);
1115
1116 10 ret = ff_set_dimensions(avctx, s->width, s->height);
1117
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 10 if (ret < 0)
1118 ✗ return ret;
1119
1120 10 s->has_alpha = get_bits1(&s->gb);
1121
1122
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 10 if (get_bits(&s->gb, 3) != 0x0) {
1123 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid WebP Lossless version\n");
1124 ✗ return AVERROR_INVALIDDATA;
1125 }
1126 } else {
1127
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 2 if (!s->width || !s->height)
1128 ✗ return AVERROR_BUG;
1129 2 w = s->width;
1130 2 h = s->height;
1131 }
1132
1133 /* parse transformations */
1134 12 s->nb_transforms = 0;
1135 12 s->reduced_width = s->width;
1136 12 used = 0;
1137
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 34 while (get_bits1(&s->gb)) {
1138 22 enum TransformType transform = get_bits(&s->gb, 2);
1139
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 22 if (used & (1 << transform)) {
1140 ✗ av_log(avctx, AV_LOG_ERROR, "Transform %d used more than once\n",
1141 transform);
1142 ✗ ret = AVERROR_INVALIDDATA;
1143 ✗ goto free_and_return;
1144 }
1145 22 used |= (1 << transform);
1146 22 s->transforms[s->nb_transforms++] = transform;
1147
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 22 switch (transform) {
1148 6 case PREDICTOR_TRANSFORM:
1149 6 ret = parse_transform_predictor(s);
1150 6 break;
1151 4 case COLOR_TRANSFORM:
1152 4 ret = parse_transform_color(s);
1153 4 break;
1154 8 case COLOR_INDEXING_TRANSFORM:
1155 8 ret = parse_transform_color_indexing(s);
1156 8 break;
1157 }
1158
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 22 if (ret < 0)
1159 ✗ goto free_and_return;
1160 }
1161
1162 /* decode primary image */
1163 12 s->image[IMAGE_ROLE_ARGB].frame = p;
1164
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 12 if (is_alpha_chunk)
1165 2 s->image[IMAGE_ROLE_ARGB].is_alpha_primary = 1;
1166 12 ret = decode_entropy_coded_image(s, IMAGE_ROLE_ARGB, w, h);
1167
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 12 if (ret < 0)
1168 ✗ goto free_and_return;
1169
1170 /* apply transformations */
1171
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 34 for (i = s->nb_transforms - 1; i >= 0; i--) {
1172
4/5
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✗ Branch 4 not taken.
 22 switch (s->transforms[i]) {
1173 6 case PREDICTOR_TRANSFORM:
1174 6 ret = apply_predictor_transform(s);
1175 6 break;
1176 4 case COLOR_TRANSFORM:
1177 4 ret = apply_color_transform(s);
1178 4 break;
1179 4 case SUBTRACT_GREEN:
1180 4 ret = apply_subtract_green_transform(s);
1181 4 break;
1182 8 case COLOR_INDEXING_TRANSFORM:
1183 8 ret = apply_color_indexing_transform(s);
1184 8 break;
1185 }
1186
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 22 if (ret < 0)
1187 ✗ goto free_and_return;
1188 }
1189
1190 12 *got_frame = 1;
1191 12 p->pict_type = AV_PICTURE_TYPE_I;
1192 12 p->flags |= AV_FRAME_FLAG_KEY;
1193 12 p->flags |= AV_FRAME_FLAG_LOSSLESS;
1194 12 ret = data_size;
1195
1196 12 free_and_return:
1197
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 72 for (i = 0; i < IMAGE_ROLE_NB; i++)
1198 60 image_ctx_free(&s->image[i]);
1199
1200 12 return ret;
1201 }
1202
1203 ✗ static void alpha_inverse_prediction(AVFrame *frame, enum AlphaFilter m)
1204 {
1205 int x, y, ls;
1206 uint8_t *dec;
1207
1208 ✗ ls = frame->linesize[3];
1209
1210 /* filter first row using horizontal filter */
1211 ✗ dec = frame->data[3] + 1;
1212 ✗ for (x = 1; x < frame->width; x++, dec++)
1213 ✗ *dec += *(dec - 1);
1214
1215 /* filter first column using vertical filter */
1216 ✗ dec = frame->data[3] + ls;
1217 ✗ for (y = 1; y < frame->height; y++, dec += ls)
1218 ✗ *dec += *(dec - ls);
1219
1220 /* filter the rest using the specified filter */
1221 ✗ switch (m) {
1222 ✗ case ALPHA_FILTER_HORIZONTAL:
1223 ✗ for (y = 1; y < frame->height; y++) {
1224 ✗ dec = frame->data[3] + y * ls + 1;
1225 ✗ for (x = 1; x < frame->width; x++, dec++)
1226 ✗ *dec += *(dec - 1);
1227 }
1228 ✗ break;
1229 ✗ case ALPHA_FILTER_VERTICAL:
1230 ✗ for (y = 1; y < frame->height; y++) {
1231 ✗ dec = frame->data[3] + y * ls + 1;
1232 ✗ for (x = 1; x < frame->width; x++, dec++)
1233 ✗ *dec += *(dec - ls);
1234 }
1235 ✗ break;
1236 ✗ case ALPHA_FILTER_GRADIENT:
1237 ✗ for (y = 1; y < frame->height; y++) {
1238 ✗ dec = frame->data[3] + y * ls + 1;
1239 ✗ for (x = 1; x < frame->width; x++, dec++)
1240 ✗ dec[0] += av_clip_uint8(*(dec - 1) + *(dec - ls) - *(dec - ls - 1));
1241 }
1242 ✗ break;
1243 }
1244 ✗ }
1245
1246 2 static int vp8_lossy_decode_alpha(AVCodecContext *avctx, AVFrame *p,
1247 const uint8_t *data_start,
1248 unsigned int data_size)
1249 {
1250 2 WebPContext *s = avctx->priv_data;
1251 int x, y, ret;
1252
1253
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 2 if (s->alpha_compression == ALPHA_COMPRESSION_NONE) {
1254 GetByteContext gb;
1255
1256 ✗ bytestream2_init(&gb, data_start, data_size);
1257 ✗ for (y = 0; y < s->height; y++)
1258 ✗ bytestream2_get_buffer(&gb, p->data[3] + p->linesize[3] * y,
1259 ✗ s->width);
1260
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✗ Branch 1 not taken.
 2 } else if (s->alpha_compression == ALPHA_COMPRESSION_VP8L) {
1261 uint8_t *ap, *pp;
1262 2 int alpha_got_frame = 0;
1263
1264 2 s->alpha_frame = av_frame_alloc();
1265
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 2 if (!s->alpha_frame)
1266 ✗ return AVERROR(ENOMEM);
1267
1268 2 ret = vp8_lossless_decode_frame(avctx, s->alpha_frame, &alpha_got_frame,
1269 data_start, data_size, 1);
1270
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 2 if (ret < 0) {
1271 ✗ av_frame_free(&s->alpha_frame);
1272 ✗ return ret;
1273 }
1274
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 2 if (!alpha_got_frame) {
1275 ✗ av_frame_free(&s->alpha_frame);
1276 ✗ return AVERROR_INVALIDDATA;
1277 }
1278
1279 /* copy green component of alpha image to alpha plane of primary image */
1280
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 18 for (y = 0; y < s->height; y++) {
1281 16 ap = GET_PIXEL(s->alpha_frame, 0, y) + 2;
1282 16 pp = p->data[3] + p->linesize[3] * y;
1283
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 208 for (x = 0; x < s->width; x++) {
1284 192 *pp = *ap;
1285 192 pp++;
1286 192 ap += 4;
1287 }
1288 }
1289 2 av_frame_free(&s->alpha_frame);
1290 }
1291
1292 /* apply alpha filtering */
1293
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 2 if (s->alpha_filter)
1294 ✗ alpha_inverse_prediction(p, s->alpha_filter);
1295
1296 2 return 0;
1297 }
1298
1299 6 static int vp8_lossy_decode_frame(AVCodecContext *avctx, AVFrame *p,
1300 int *got_frame, uint8_t *data_start,
1301 unsigned int data_size)
1302 {
1303 6 WebPContext *s = avctx->priv_data;
1304 int ret;
1305
1306
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✗ Branch 1 not taken.
 6 if (!s->initialized) {
1307 6 ff_vp8_decode_init(avctx);
1308 6 s->initialized = 1;
1309 6 s->v.actually_webp = 1;
1310 }
1311
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 6 avctx->pix_fmt = s->has_alpha ? AV_PIX_FMT_YUVA420P : AV_PIX_FMT_YUV420P;
1312 6 s->lossless = 0;
1313
1314
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 6 if (data_size > INT_MAX) {
1315 ✗ av_log(avctx, AV_LOG_ERROR, "unsupported chunk size\n");
1316 ✗ return AVERROR_PATCHWELCOME;
1317 }
1318
1319 6 av_packet_unref(s->pkt);
1320 6 s->pkt->data = data_start;
1321 6 s->pkt->size = data_size;
1322
1323 6 ret = ff_vp8_decode_frame(avctx, p, got_frame, s->pkt);
1324
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 6 if (ret < 0)
1325 ✗ return ret;
1326
1327
1/2
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 6 if (!*got_frame)
1328 ✗ return AVERROR_INVALIDDATA;
1329
1330 6 update_canvas_size(avctx, avctx->width, avctx->height);
1331
1332
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 6 if (s->has_alpha) {
1333 2 ret = vp8_lossy_decode_alpha(avctx, p, s->alpha_data,
1334 2 s->alpha_data_size);
1335
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 2 if (ret < 0)
1336 ✗ return ret;
1337 }
1338 6 return ret;
1339 }
1340
1341 16 static int webp_decode_frame(AVCodecContext *avctx, AVFrame *p,
1342 int *got_frame, AVPacket *avpkt)
1343 {
1344 16 WebPContext *s = avctx->priv_data;
1345 GetByteContext gb;
1346 int ret;
1347 uint32_t chunk_type, chunk_size;
1348 16 int vp8x_flags = 0;
1349
1350 16 s->avctx = avctx;
1351 16 s->width = 0;
1352 16 s->height = 0;
1353 16 *got_frame = 0;
1354 16 s->has_alpha = 0;
1355 16 s->has_exif = 0;
1356 16 s->has_iccp = 0;
1357 16 bytestream2_init(&gb, avpkt->data, avpkt->size);
1358
1359
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 16 if (bytestream2_get_bytes_left(&gb) < 12)
1360 ✗ return AVERROR_INVALIDDATA;
1361
1362
1/2
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 16 if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) {
1363 ✗ av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
1364 ✗ return AVERROR_INVALIDDATA;
1365 }
1366
1367 16 chunk_size = bytestream2_get_le32(&gb);
1368
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 16 if (bytestream2_get_bytes_left(&gb) < chunk_size)
1369 ✗ return AVERROR_INVALIDDATA;
1370
1371
1/2
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 16 if (bytestream2_get_le32(&gb) != MKTAG('W', 'E', 'B', 'P')) {
1372 ✗ av_log(avctx, AV_LOG_ERROR, "missing WEBP tag\n");
1373 ✗ return AVERROR_INVALIDDATA;
1374 }
1375
1376
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 40 while (bytestream2_get_bytes_left(&gb) > 8) {
1377 24 char chunk_str[5] = { 0 };
1378
1379 24 chunk_type = bytestream2_get_le32(&gb);
1380 24 chunk_size = bytestream2_get_le32(&gb);
1381
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 24 if (chunk_size == UINT32_MAX)
1382 ✗ return AVERROR_INVALIDDATA;
1383 24 chunk_size += chunk_size & 1;
1384
1385
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 24 if (bytestream2_get_bytes_left(&gb) < chunk_size) {
1386 /* we seem to be running out of data, but it could also be that the
1387 bitstream has trailing junk leading to bogus chunk_size. */
1388 ✗ break;
1389 }
1390
1391
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 24 switch (chunk_type) {
1392 6 case MKTAG('V', 'P', '8', ' '):
1393
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✗ Branch 1 not taken.
 6 if (!*got_frame) {
1394 6 ret = vp8_lossy_decode_frame(avctx, p, got_frame,
1395 6 avpkt->data + bytestream2_tell(&gb),
1396 chunk_size);
1397
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 6 if (ret < 0)
1398 ✗ return ret;
1399 }
1400 6 bytestream2_skip(&gb, chunk_size);
1401 6 break;
1402 10 case MKTAG('V', 'P', '8', 'L'):
1403
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✗ Branch 1 not taken.
 10 if (!*got_frame) {
1404 10 ret = vp8_lossless_decode_frame(avctx, p, got_frame,
1405 10 avpkt->data + bytestream2_tell(&gb),
1406 chunk_size, 0);
1407
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 10 if (ret < 0)
1408 ✗ return ret;
1409 #if FF_API_CODEC_PROPS
1410 FF_DISABLE_DEPRECATION_WARNINGS
1411 10 avctx->properties |= FF_CODEC_PROPERTY_LOSSLESS;
1412 FF_ENABLE_DEPRECATION_WARNINGS
1413 #endif
1414 }
1415 10 bytestream2_skip(&gb, chunk_size);
1416 10 break;
1417 4 case MKTAG('V', 'P', '8', 'X'):
1418
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 4 if (s->width || s->height || *got_frame) {
1419 ✗ av_log(avctx, AV_LOG_ERROR, "Canvas dimensions are already set\n");
1420 ✗ return AVERROR_INVALIDDATA;
1421 }
1422 4 vp8x_flags = bytestream2_get_byte(&gb);
1423 4 bytestream2_skip(&gb, 3);
1424 4 s->width = bytestream2_get_le24(&gb) + 1;
1425 4 s->height = bytestream2_get_le24(&gb) + 1;
1426 4 ret = av_image_check_size(s->width, s->height, 0, avctx);
1427
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 4 if (ret < 0)
1428 ✗ return ret;
1429 4 break;
1430 2 case MKTAG('A', 'L', 'P', 'H'): {
1431 int alpha_header, filter_m, compression;
1432
1433
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 2 if (!(vp8x_flags & VP8X_FLAG_ALPHA)) {
1434 ✗ av_log(avctx, AV_LOG_WARNING,
1435 "ALPHA chunk present, but alpha bit not set in the "
1436 "VP8X header\n");
1437 }
1438
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 2 if (chunk_size == 0) {
1439 ✗ av_log(avctx, AV_LOG_ERROR, "invalid ALPHA chunk size\n");
1440 ✗ return AVERROR_INVALIDDATA;
1441 }
1442 2 alpha_header = bytestream2_get_byte(&gb);
1443 2 s->alpha_data = avpkt->data + bytestream2_tell(&gb);
1444 2 s->alpha_data_size = chunk_size - 1;
1445 2 bytestream2_skip(&gb, s->alpha_data_size);
1446
1447 2 filter_m = (alpha_header >> 2) & 0x03;
1448 2 compression = alpha_header & 0x03;
1449
1450
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 2 if (compression > ALPHA_COMPRESSION_VP8L) {
1451 ✗ av_log(avctx, AV_LOG_VERBOSE,
1452 "skipping unsupported ALPHA chunk\n");
1453 } else {
1454 2 s->has_alpha = 1;
1455 2 s->alpha_compression = compression;
1456 2 s->alpha_filter = filter_m;
1457 }
1458
1459 2 break;
1460 }
1461 2 case MKTAG('E', 'X', 'I', 'F'): {
1462 2 AVBufferRef *exif_buf = NULL;
1463
1464
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 2 if (s->has_exif) {
1465 ✗ av_log(avctx, AV_LOG_VERBOSE, "Ignoring extra EXIF chunk\n");
1466 ✗ goto exif_end;
1467 }
1468
1469
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 2 if (!(vp8x_flags & VP8X_FLAG_EXIF_METADATA))
1470 ✗ av_log(avctx, AV_LOG_WARNING,
1471 "EXIF chunk present, but Exif bit not set in the "
1472 "VP8X header\n");
1473
1474 2 exif_buf = av_buffer_alloc(chunk_size);
1475
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 2 if (!exif_buf) {
1476 ✗ av_log(avctx, AV_LOG_WARNING, "unable to allocate EXIF buffer\n");
1477 ✗ goto exif_end;
1478 }
1479 2 s->has_exif = 1;
1480 2 memcpy(exif_buf->data, gb.buffer, chunk_size);
1481
1482 2 ret = ff_decode_exif_attach_buffer(avctx, p, &exif_buf, AV_EXIF_TIFF_HEADER);
1483
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 2 if (ret < 0)
1484 ✗ av_log(avctx, AV_LOG_WARNING, "unable to attach EXIF buffer\n");
1485
1486 2 exif_end:
1487 2 bytestream2_skip(&gb, chunk_size);
1488 2 break;
1489 }
1490 ✗ case MKTAG('I', 'C', 'C', 'P'): {
1491 AVFrameSideData *sd;
1492
1493 ✗ if (s->has_iccp) {
1494 ✗ av_log(avctx, AV_LOG_VERBOSE, "Ignoring extra ICCP chunk\n");
1495 ✗ bytestream2_skip(&gb, chunk_size);
1496 ✗ break;
1497 }
1498 ✗ if (!(vp8x_flags & VP8X_FLAG_ICC))
1499 ✗ av_log(avctx, AV_LOG_WARNING,
1500 "ICCP chunk present, but ICC Profile bit not set in the "
1501 "VP8X header\n");
1502
1503 ✗ s->has_iccp = 1;
1504
1505 ✗ ret = ff_frame_new_side_data(avctx, p, AV_FRAME_DATA_ICC_PROFILE, chunk_size, &sd);
1506 ✗ if (ret < 0)
1507 ✗ return ret;
1508
1509 ✗ if (sd) {
1510 ✗ bytestream2_get_buffer(&gb, sd->data, chunk_size);
1511 } else {
1512 ✗ bytestream2_skip(&gb, chunk_size);
1513 }
1514 ✗ break;
1515 }
1516 ✗ case MKTAG('A', 'N', 'I', 'M'):
1517 case MKTAG('A', 'N', 'M', 'F'):
1518 case MKTAG('X', 'M', 'P', ' '):
1519 ✗ AV_WL32(chunk_str, chunk_type);
1520 ✗ av_log(avctx, AV_LOG_WARNING, "skipping unsupported chunk: %s\n",
1521 chunk_str);
1522 ✗ bytestream2_skip(&gb, chunk_size);
1523 ✗ break;
1524 ✗ default:
1525 ✗ AV_WL32(chunk_str, chunk_type);
1526 ✗ av_log(avctx, AV_LOG_VERBOSE, "skipping unknown chunk: %s\n",
1527 chunk_str);
1528 ✗ bytestream2_skip(&gb, chunk_size);
1529 ✗ break;
1530 }
1531 }
1532
1533
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 16 if (!*got_frame) {
1534 ✗ av_log(avctx, AV_LOG_ERROR, "image data not found\n");
1535 ✗ return AVERROR_INVALIDDATA;
1536 }
1537
1538 16 return avpkt->size;
1539 }
1540
1541 16 static av_cold int webp_decode_init(AVCodecContext *avctx)
1542 {
1543 16 WebPContext *s = avctx->priv_data;
1544
1545 16 s->pkt = av_packet_alloc();
1546
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 16 if (!s->pkt)
1547 ✗ return AVERROR(ENOMEM);
1548
1549 16 return 0;
1550 }
1551
1552 16 static av_cold int webp_decode_close(AVCodecContext *avctx)
1553 {
1554 16 WebPContext *s = avctx->priv_data;
1555
1556 16 av_packet_free(&s->pkt);
1557
1558
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 16 if (s->initialized)
1559 6 return ff_vp8_decode_free(avctx);
1560
1561 10 return 0;
1562 }
1563
1564 const FFCodec ff_webp_decoder = {
1565 .p.name = "webp",
1566 CODEC_LONG_NAME("WebP image"),
1567 .p.type = AVMEDIA_TYPE_VIDEO,
1568 .p.id = AV_CODEC_ID_WEBP,
1569 .priv_data_size = sizeof(WebPContext),
1570 .init = webp_decode_init,
1571 FF_CODEC_DECODE_CB(webp_decode_frame),
1572 .close = webp_decode_close,
1573 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
1574 .caps_internal = FF_CODEC_CAP_ICC_PROFILES |
1575 FF_CODEC_CAP_USES_PROGRESSFRAMES,
1576 };
1577