FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/webp.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 611 792 77.1%
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
211 int nb_transforms; /* number of transforms */
212 enum TransformType transforms[4]; /* transformations used in the image, in order */
213 /* reduced width when using a color indexing transform with <= 16 colors (pixel packing)
214 * before pixels are unpacked, or same as width otherwise. */
215 int reduced_width;
216 int nb_huffman_groups; /* number of huffman groups in the primary image */
217 ImageContext image[IMAGE_ROLE_NB]; /* image context for each role */
218 } WebPContext;
219
220 #define GET_PIXEL(frame, x, y) \
221 ((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x))
222
223 #define GET_PIXEL_COMP(frame, x, y, c) \
224 (*((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x) + c))
225
226 60 static void image_ctx_free(ImageContext *img)
227 {
228 int i, j;
229
230 60 av_free(img->color_cache);
231
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 60 if (img->role != IMAGE_ROLE_ARGB && !img->is_alpha_primary)
232 22 av_frame_free(&img->frame);
233
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 60 if (img->huffman_groups) {
234
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 76 for (i = 0; i < img->nb_huffman_groups; i++) {
235
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 252 for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++)
236 210 ff_vlc_free(&img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE + j].vlc);
237 }
238 34 av_free(img->huffman_groups);
239 }
240 60 memset(img, 0, sizeof(*img));
241 60 }
242
243 280428 static int huff_reader_get_symbol(HuffReader *r, GetBitContext *gb)
244 {
245
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 280428 if (r->simple) {
246
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 73834 if (r->nb_symbols == 1)
247 73514 return r->simple_symbols[0];
248 else
249 320 return r->simple_symbols[get_bits1(gb)];
250 } else
251 206594 return get_vlc2(gb, r->vlc.table, 8, 2);
252 }
253
254 160 static int huff_reader_build_canonical(HuffReader *r, const uint8_t *code_lengths,
255 uint16_t len_counts[MAX_HUFFMAN_CODE_LENGTH + 1],
256 uint8_t lens[], uint16_t syms[],
257 int alphabet_size, void *logctx)
258 {
259 160 unsigned nb_codes = 0;
260 int ret;
261
262 // Count the number of symbols of each length and transform len_counts
263 // into an array of offsets.
264
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 2560 for (int len = 1; len <= MAX_HUFFMAN_CODE_LENGTH; ++len) {
265 2400 unsigned cnt = len_counts[len];
266 2400 len_counts[len] = nb_codes;
267 2400 nb_codes += cnt;
268 }
269
270
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 22210 for (int sym = 0; sym < alphabet_size; ++sym) {
271
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 22050 if (code_lengths[sym]) {
272 7476 unsigned idx = len_counts[code_lengths[sym]]++;
273 7476 syms[idx] = sym;
274 7476 lens[idx] = code_lengths[sym];
275 }
276 }
277
278
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 160 if (nb_codes == 0) {
279 // No symbols
280 ✗ return AVERROR_INVALIDDATA;
281 }
282
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 160 if (nb_codes == 1) {
283 // Special-case 1 symbol since the VLC reader cannot handle it
284 ✗ r->nb_symbols = 1;
285 ✗ r->simple = 1;
286 ✗ r->simple_symbols[0] = syms[0];
287 ✗ return 0;
288 }
289
290 160 ret = ff_vlc_init_from_lengths(&r->vlc, 8, nb_codes, lens, 1,
291 syms, 2, 2, 0, VLC_INIT_OUTPUT_LE, logctx);
292
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 160 if (ret < 0)
293 ✗ return ret;
294 160 r->simple = 0;
295
296 160 return 0;
297 }
298
299 130 static void read_huffman_code_simple(WebPContext *s, HuffReader *hc)
300 {
301 130 hc->nb_symbols = get_bits1(&s->gb) + 1;
302
303
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 130 if (get_bits1(&s->gb))
304 18 hc->simple_symbols[0] = get_bits(&s->gb, 8);
305 else
306 112 hc->simple_symbols[0] = get_bits1(&s->gb);
307
308
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 130 if (hc->nb_symbols == 2)
309 14 hc->simple_symbols[1] = get_bits(&s->gb, 8);
310
311 130 hc->simple = 1;
312 130 }
313
314 80 static int read_huffman_code_normal(WebPContext *s, HuffReader *hc,
315 int alphabet_size)
316 {
317 80 HuffReader code_len_hc = { { 0 }, 0, 0, { 0 } };
318 uint8_t *code_lengths;
319 80 uint8_t code_length_code_lengths[NUM_CODE_LENGTH_CODES] = { 0 };
320 uint8_t reordered_code_length_code_lengths[NUM_CODE_LENGTH_CODES];
321 uint16_t reordered_code_length_syms[NUM_CODE_LENGTH_CODES];
322 80 uint16_t len_counts[MAX_HUFFMAN_CODE_LENGTH + 1] = { 0 };
323 int symbol, max_symbol, prev_code_len, ret;
324 80 int num_codes = 4 + get_bits(&s->gb, 4);
325
326 av_assert1(num_codes <= NUM_CODE_LENGTH_CODES);
327
328
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 1180 for (int i = 0; i < num_codes; i++) {
329 1100 unsigned len = get_bits(&s->gb, 3);
330 1100 code_length_code_lengths[code_length_code_order[i]] = len;
331 1100 len_counts[len]++;
332 }
333
334
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 80 if (get_bits1(&s->gb)) {
335 8 int bits = 2 + 2 * get_bits(&s->gb, 3);
336 8 max_symbol = 2 + get_bits(&s->gb, bits);
337
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 8 if (max_symbol > alphabet_size) {
338 ✗ av_log(s->avctx, AV_LOG_ERROR, "max symbol %d > alphabet size %d\n",
339 max_symbol, alphabet_size);
340 ✗ return AVERROR_INVALIDDATA;
341 }
342 } else {
343 72 max_symbol = alphabet_size;
344 }
345
346 80 ret = huff_reader_build_canonical(&code_len_hc, code_length_code_lengths, len_counts,
347 reordered_code_length_code_lengths,
348 reordered_code_length_syms,
349 80 NUM_CODE_LENGTH_CODES, s->avctx);
350
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 80 if (ret < 0)
351 ✗ return ret;
352
353 80 code_lengths = av_malloc_array(alphabet_size, 2 * sizeof(uint8_t) + sizeof(uint16_t));
354
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 80 if (!code_lengths) {
355 ✗ ret = AVERROR(ENOMEM);
356 ✗ goto finish;
357 }
358
359 80 prev_code_len = 8;
360 80 symbol = 0;
361 80 memset(len_counts, 0, sizeof(len_counts));
362
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 3336 while (symbol < alphabet_size) {
363 int code_len;
364
365
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 3264 if (!max_symbol--)
366 8 break;
367 3256 code_len = huff_reader_get_symbol(&code_len_hc, &s->gb);
368
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 3256 if (code_len < 16U) {
369 /* Code length code [0..15] indicates literal code lengths. */
370 1938 code_lengths[symbol++] = code_len;
371 1938 len_counts[code_len]++;
372
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 1938 if (code_len)
373 1818 prev_code_len = code_len;
374 } else {
375 1318 int repeat = 0, length = 0;
376
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 1318 switch (code_len) {
377 ✗ default:
378 ✗ ret = AVERROR_INVALIDDATA;
379 ✗ goto finish;
380 888 case 16:
381 /* Code 16 repeats the previous non-zero value [3..6] times,
382 * i.e., 3 + ReadBits(2) times. If code 16 is used before a
383 * non-zero value has been emitted, a value of 8 is repeated. */
384 888 repeat = 3 + get_bits(&s->gb, 2);
385 888 length = prev_code_len;
386 888 len_counts[length] += repeat;
387 888 break;
388 160 case 17:
389 /* Code 17 emits a streak of zeros [3..10], i.e.,
390 * 3 + ReadBits(3) times. */
391 160 repeat = 3 + get_bits(&s->gb, 3);
392 160 break;
393 270 case 18:
394 /* Code 18 emits a streak of zeros of length [11..138], i.e.,
395 * 11 + ReadBits(7) times. */
396 270 repeat = 11 + get_bits(&s->gb, 7);
397 270 break;
398 }
399
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 1318 if (symbol + repeat > alphabet_size) {
400 ✗ av_log(s->avctx, AV_LOG_ERROR,
401 "invalid symbol %d + repeat %d > alphabet size %d\n",
402 symbol, repeat, alphabet_size);
403 ✗ ret = AVERROR_INVALIDDATA;
404 ✗ goto finish;
405 }
406
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 19910 while (repeat-- > 0)
407 18592 code_lengths[symbol++] = length;
408 }
409 }
410
411 80 ret = huff_reader_build_canonical(hc, code_lengths, len_counts,
412 code_lengths + symbol,
413 80 (uint16_t*)(code_lengths + 2 * symbol),
414 80 symbol, s->avctx);
415
416 80 finish:
417 80 ff_vlc_free(&code_len_hc.vlc);
418 80 av_free(code_lengths);
419 80 return ret;
420 }
421
422 static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role,
423 int w, int h);
424
425 #define PARSE_BLOCK_SIZE(w, h) do { \
426 block_bits = get_bits(&s->gb, 3) + 2; \
427 blocks_w = FFALIGN((w), 1 << block_bits) >> block_bits; \
428 blocks_h = FFALIGN((h), 1 << block_bits) >> block_bits; \
429 } while (0)
430
431 4 static int decode_entropy_image(WebPContext *s)
432 {
433 ImageContext *img;
434 int ret, block_bits, blocks_w, blocks_h, x, y, max;
435
436 4 PARSE_BLOCK_SIZE(s->reduced_width, s->height);
437
438 4 ret = decode_entropy_coded_image(s, IMAGE_ROLE_ENTROPY, blocks_w, blocks_h);
439
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 4 if (ret < 0)
440 ✗ return ret;
441
442 4 img = &s->image[IMAGE_ROLE_ENTROPY];
443 4 img->size_reduction = block_bits;
444
445 /* the number of huffman groups is determined by the maximum group number
446 * coded in the entropy image */
447 4 max = 0;
448
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 68 for (y = 0; y < img->frame->height; y++) {
449
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 1088 for (x = 0; x < img->frame->width; x++) {
450 1024 int p0 = GET_PIXEL_COMP(img->frame, x, y, 1);
451 1024 int p1 = GET_PIXEL_COMP(img->frame, x, y, 2);
452 1024 int p = p0 << 8 | p1;
453 1024 max = FFMAX(max, p);
454 }
455 }
456 4 s->nb_huffman_groups = max + 1;
457
458 4 return 0;
459 }
460
461 6 static int parse_transform_predictor(WebPContext *s)
462 {
463 int block_bits, blocks_w, blocks_h, ret;
464
465 6 PARSE_BLOCK_SIZE(s->reduced_width, s->height);
466
467 6 ret = decode_entropy_coded_image(s, IMAGE_ROLE_PREDICTOR, blocks_w,
468 blocks_h);
469
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 6 if (ret < 0)
470 ✗ return ret;
471
472 6 s->image[IMAGE_ROLE_PREDICTOR].size_reduction = block_bits;
473
474 6 return 0;
475 }
476
477 4 static int parse_transform_color(WebPContext *s)
478 {
479 int block_bits, blocks_w, blocks_h, ret;
480
481 4 PARSE_BLOCK_SIZE(s->reduced_width, s->height);
482
483 4 ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_TRANSFORM, blocks_w,
484 blocks_h);
485
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 4 if (ret < 0)
486 ✗ return ret;
487
488 4 s->image[IMAGE_ROLE_COLOR_TRANSFORM].size_reduction = block_bits;
489
490 4 return 0;
491 }
492
493 8 static int parse_transform_color_indexing(WebPContext *s)
494 {
495 ImageContext *img;
496 int width_bits, index_size, ret, x;
497 uint8_t *ct;
498
499 8 index_size = get_bits(&s->gb, 8) + 1;
500
501
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 8 if (index_size <= 2)
502 2 width_bits = 3;
503
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 6 else if (index_size <= 4)
504 2 width_bits = 2;
505
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 4 else if (index_size <= 16)
506 ✗ width_bits = 1;
507 else
508 4 width_bits = 0;
509
510 8 ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_INDEXING,
511 index_size, 1);
512
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 8 if (ret < 0)
513 ✗ return ret;
514
515 8 img = &s->image[IMAGE_ROLE_COLOR_INDEXING];
516 8 img->size_reduction = width_bits;
517
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 8 if (width_bits > 0)
518 4 s->reduced_width = (s->width + ((1 << width_bits) - 1)) >> width_bits;
519
520 /* color index values are delta-coded */
521 8 ct = img->frame->data[0] + 4;
522
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 1432 for (x = 4; x < img->frame->width * 4; x++, ct++)
523 1424 ct[0] += ct[-4];
524
525 8 return 0;
526 }
527
528 69356 static HuffReader *get_huffman_group(WebPContext *s, ImageContext *img,
529 int x, int y)
530 {
531 69356 ImageContext *gimg = &s->image[IMAGE_ROLE_ENTROPY];
532 69356 int group = 0;
533
534
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 69356 if (gimg->size_reduction > 0) {
535 65536 int group_x = x >> gimg->size_reduction;
536 65536 int group_y = y >> gimg->size_reduction;
537 65536 int g0 = GET_PIXEL_COMP(gimg->frame, group_x, group_y, 1);
538 65536 int g1 = GET_PIXEL_COMP(gimg->frame, group_x, group_y, 2);
539 65536 group = g0 << 8 | g1;
540 }
541
542 69356 return &img->huffman_groups[group * HUFFMAN_CODES_PER_META_CODE];
543 }
544
545 ✗ static av_always_inline void color_cache_put(ImageContext *img, uint32_t c)
546 {
547 ✗ uint32_t cache_idx = (0x1E35A7BD * c) >> (32 - img->color_cache_bits);
548 ✗ img->color_cache[cache_idx] = c;
549 ✗ }
550
551 34 static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role,
552 int w, int h)
553 {
554 ImageContext *img;
555 HuffReader *hg;
556 int i, j, ret, x, y, width;
557
558 34 img = &s->image[role];
559 34 img->role = role;
560
561
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 34 if (!img->frame) {
562 22 img->frame = av_frame_alloc();
563
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 22 if (!img->frame)
564 ✗ return AVERROR(ENOMEM);
565 }
566
567 34 img->frame->format = AV_PIX_FMT_ARGB;
568 34 img->frame->width = w;
569 34 img->frame->height = h;
570
571
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 34 if (role == IMAGE_ROLE_ARGB && !img->is_alpha_primary) {
572 10 ret = ff_thread_get_buffer(s->avctx, img->frame, 0);
573 } else
574 24 ret = av_frame_get_buffer(img->frame, 1);
575
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 34 if (ret < 0)
576 ✗ return ret;
577
578
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 34 if (get_bits1(&s->gb)) {
579 ✗ img->color_cache_bits = get_bits(&s->gb, 4);
580 ✗ if (img->color_cache_bits < 1 || img->color_cache_bits > 11) {
581 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid color cache bits: %d\n",
582 img->color_cache_bits);
583 ✗ return AVERROR_INVALIDDATA;
584 }
585 ✗ img->color_cache = av_calloc(1 << img->color_cache_bits,
586 sizeof(*img->color_cache));
587 ✗ if (!img->color_cache)
588 ✗ return AVERROR(ENOMEM);
589 } else {
590 34 img->color_cache_bits = 0;
591 }
592
593 34 img->nb_huffman_groups = 1;
594
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 34 if (role == IMAGE_ROLE_ARGB && get_bits1(&s->gb)) {
595 4 ret = decode_entropy_image(s);
596
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 4 if (ret < 0)
597 ✗ return ret;
598 4 img->nb_huffman_groups = s->nb_huffman_groups;
599 }
600 34 img->huffman_groups = av_calloc(img->nb_huffman_groups,
601 HUFFMAN_CODES_PER_META_CODE *
602 sizeof(*img->huffman_groups));
603
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 34 if (!img->huffman_groups)
604 ✗ return AVERROR(ENOMEM);
605
606
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 76 for (i = 0; i < img->nb_huffman_groups; i++) {
607 42 hg = &img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE];
608
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 252 for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++) {
609 210 int alphabet_size = alphabet_sizes[j];
610
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 210 if (!j && img->color_cache_bits > 0)
611 ✗ alphabet_size += 1 << img->color_cache_bits;
612
613
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 210 if (get_bits1(&s->gb)) {
614 130 read_huffman_code_simple(s, &hg[j]);
615 } else {
616 80 ret = read_huffman_code_normal(s, &hg[j], alphabet_size);
617
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 80 if (ret < 0)
618 ✗ return ret;
619 }
620 }
621 }
622
623 34 width = img->frame->width;
624
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 34 if (role == IMAGE_ROLE_ARGB)
625 12 width = s->reduced_width;
626
627 34 x = 0; y = 0;
628
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 69390 while (y < img->frame->height) {
629 int v;
630
631
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 69356 if (get_bits_left(&s->gb) < 0)
632 ✗ return AVERROR_INVALIDDATA;
633
634 69356 hg = get_huffman_group(s, img, x, y);
635 69356 v = huff_reader_get_symbol(&hg[HUFF_IDX_GREEN], &s->gb);
636
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 69356 if (v < NUM_LITERAL_CODES) {
637 /* literal pixel values */
638 69230 uint8_t *p = GET_PIXEL(img->frame, x, y);
639 69230 p[2] = v;
640 69230 p[1] = huff_reader_get_symbol(&hg[HUFF_IDX_RED], &s->gb);
641 69230 p[3] = huff_reader_get_symbol(&hg[HUFF_IDX_BLUE], &s->gb);
642 69230 p[0] = huff_reader_get_symbol(&hg[HUFF_IDX_ALPHA], &s->gb);
643
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 69230 if (img->color_cache_bits)
644 ✗ color_cache_put(img, AV_RB32(p));
645 69230 x++;
646
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 69230 if (x == width) {
647 750 x = 0;
648 750 y++;
649 }
650
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 126 } else if (v < NUM_LITERAL_CODES + NUM_LENGTH_CODES) {
651 /* LZ77 backwards mapping */
652 int prefix_code, length, distance, ref_x, ref_y;
653
654 /* parse length and distance */
655 126 prefix_code = v - NUM_LITERAL_CODES;
656
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 126 if (prefix_code < 4) {
657 48 length = prefix_code + 1;
658 } else {
659 78 int extra_bits = (prefix_code - 2) >> 1;
660 78 int offset = 2 + (prefix_code & 1) << extra_bits;
661 78 length = offset + get_bits(&s->gb, extra_bits) + 1;
662 }
663 126 prefix_code = huff_reader_get_symbol(&hg[HUFF_IDX_DIST], &s->gb);
664
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 126 if (prefix_code > 39U) {
665 ✗ av_log(s->avctx, AV_LOG_ERROR,
666 "distance prefix code too large: %d\n", prefix_code);
667 ✗ return AVERROR_INVALIDDATA;
668 }
669
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 126 if (prefix_code < 4) {
670 126 distance = prefix_code + 1;
671 } else {
672 ✗ int extra_bits = prefix_code - 2 >> 1;
673 ✗ int offset = 2 + (prefix_code & 1) << extra_bits;
674 ✗ distance = offset + get_bits(&s->gb, extra_bits) + 1;
675 }
676
677 /* find reference location */
678
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 126 if (distance <= NUM_SHORT_DISTANCES) {
679 126 int xi = lz77_distance_offsets[distance - 1][0];
680 126 int yi = lz77_distance_offsets[distance - 1][1];
681 126 distance = FFMAX(1, xi + yi * width);
682 } else {
683 ✗ distance -= NUM_SHORT_DISTANCES;
684 }
685 126 ref_x = x;
686 126 ref_y = y;
687
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 126 if (distance <= x) {
688 40 ref_x -= distance;
689 40 distance = 0;
690 } else {
691 86 ref_x = 0;
692 86 distance -= x;
693 }
694
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 148 while (distance >= width) {
695 22 ref_y--;
696 22 distance -= width;
697 }
698
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 126 if (distance > 0) {
699 64 ref_x = width - distance;
700 64 ref_y--;
701 }
702 126 ref_x = FFMAX(0, ref_x);
703 126 ref_y = FFMAX(0, ref_y);
704
705
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 126 if (ref_y == y && ref_x >= x)
706 ✗ return AVERROR_INVALIDDATA;
707
708 /* copy pixels
709 * source and dest regions can overlap and wrap lines, so just
710 * copy per-pixel */
711
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 1076 for (i = 0; i < length; i++) {
712 958 uint8_t *p_ref = GET_PIXEL(img->frame, ref_x, ref_y);
713 958 uint8_t *p = GET_PIXEL(img->frame, x, y);
714
715 958 AV_COPY32(p, p_ref);
716
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 958 if (img->color_cache_bits)
717 ✗ color_cache_put(img, AV_RB32(p));
718 958 x++;
719 958 ref_x++;
720
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 958 if (x == width) {
721 74 x = 0;
722 74 y++;
723 }
724
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 958 if (ref_x == width) {
725 72 ref_x = 0;
726 72 ref_y++;
727 }
728
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 958 if (y == img->frame->height || ref_y == img->frame->height)
729 break;
730 }
731 } else {
732 /* read from color cache */
733 ✗ uint8_t *p = GET_PIXEL(img->frame, x, y);
734 ✗ int cache_idx = v - (NUM_LITERAL_CODES + NUM_LENGTH_CODES);
735
736 ✗ if (!img->color_cache_bits) {
737 ✗ av_log(s->avctx, AV_LOG_ERROR, "color cache not found\n");
738 ✗ return AVERROR_INVALIDDATA;
739 }
740 ✗ if (cache_idx >= 1 << img->color_cache_bits) {
741 ✗ av_log(s->avctx, AV_LOG_ERROR,
742 "color cache index out-of-bounds\n");
743 ✗ return AVERROR_INVALIDDATA;
744 }
745 ✗ AV_WB32(p, img->color_cache[cache_idx]);
746 ✗ x++;
747 ✗ if (x == width) {
748 ✗ x = 0;
749 ✗ y++;
750 }
751 }
752 }
753
754 34 return 0;
755 }
756
757 /* PRED_MODE_BLACK */
758 6 static void inv_predict_0(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
759 const uint8_t *p_t, const uint8_t *p_tr)
760 {
761 6 AV_WB32(p, 0xFF000000);
762 6 }
763
764 /* PRED_MODE_L */
765 5300 static void inv_predict_1(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
766 const uint8_t *p_t, const uint8_t *p_tr)
767 {
768 5300 AV_COPY32(p, p_l);
769 5300 }
770
771 /* PRED_MODE_T */
772 21182 static void inv_predict_2(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
773 const uint8_t *p_t, const uint8_t *p_tr)
774 {
775 21182 AV_COPY32(p, p_t);
776 21182 }
777
778 /* PRED_MODE_TR */
779 6336 static void inv_predict_3(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
780 const uint8_t *p_t, const uint8_t *p_tr)
781 {
782 6336 AV_COPY32(p, p_tr);
783 6336 }
784
785 /* PRED_MODE_TL */
786 1248 static void inv_predict_4(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
787 const uint8_t *p_t, const uint8_t *p_tr)
788 {
789 1248 AV_COPY32(p, p_tl);
790 1248 }
791
792 /* PRED_MODE_AVG_T_AVG_L_TR */
793 4832 static void inv_predict_5(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
794 const uint8_t *p_t, const uint8_t *p_tr)
795 {
796 4832 p[0] = p_t[0] + (p_l[0] + p_tr[0] >> 1) >> 1;
797 4832 p[1] = p_t[1] + (p_l[1] + p_tr[1] >> 1) >> 1;
798 4832 p[2] = p_t[2] + (p_l[2] + p_tr[2] >> 1) >> 1;
799 4832 p[3] = p_t[3] + (p_l[3] + p_tr[3] >> 1) >> 1;
800 4832 }
801
802 /* PRED_MODE_AVG_L_TL */
803 768 static void inv_predict_6(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
804 const uint8_t *p_t, const uint8_t *p_tr)
805 {
806 768 p[0] = p_l[0] + p_tl[0] >> 1;
807 768 p[1] = p_l[1] + p_tl[1] >> 1;
808 768 p[2] = p_l[2] + p_tl[2] >> 1;
809 768 p[3] = p_l[3] + p_tl[3] >> 1;
810 768 }
811
812 /* PRED_MODE_AVG_L_T */
813 3072 static void inv_predict_7(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
814 const uint8_t *p_t, const uint8_t *p_tr)
815 {
816 3072 p[0] = p_l[0] + p_t[0] >> 1;
817 3072 p[1] = p_l[1] + p_t[1] >> 1;
818 3072 p[2] = p_l[2] + p_t[2] >> 1;
819 3072 p[3] = p_l[3] + p_t[3] >> 1;
820 3072 }
821
822 /* PRED_MODE_AVG_TL_T */
823 4512 static void inv_predict_8(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
824 const uint8_t *p_t, const uint8_t *p_tr)
825 {
826 4512 p[0] = p_tl[0] + p_t[0] >> 1;
827 4512 p[1] = p_tl[1] + p_t[1] >> 1;
828 4512 p[2] = p_tl[2] + p_t[2] >> 1;
829 4512 p[3] = p_tl[3] + p_t[3] >> 1;
830 4512 }
831
832 /* PRED_MODE_AVG_T_TR */
833 11488 static void inv_predict_9(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
834 const uint8_t *p_t, const uint8_t *p_tr)
835 {
836 11488 p[0] = p_t[0] + p_tr[0] >> 1;
837 11488 p[1] = p_t[1] + p_tr[1] >> 1;
838 11488 p[2] = p_t[2] + p_tr[2] >> 1;
839 11488 p[3] = p_t[3] + p_tr[3] >> 1;
840 11488 }
841
842 /* PRED_MODE_AVG_AVG_L_TL_AVG_T_TR */
843 3236 static void inv_predict_10(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
844 const uint8_t *p_t, const uint8_t *p_tr)
845 {
846 3236 p[0] = (p_l[0] + p_tl[0] >> 1) + (p_t[0] + p_tr[0] >> 1) >> 1;
847 3236 p[1] = (p_l[1] + p_tl[1] >> 1) + (p_t[1] + p_tr[1] >> 1) >> 1;
848 3236 p[2] = (p_l[2] + p_tl[2] >> 1) + (p_t[2] + p_tr[2] >> 1) >> 1;
849 3236 p[3] = (p_l[3] + p_tl[3] >> 1) + (p_t[3] + p_tr[3] >> 1) >> 1;
850 3236 }
851
852 /* PRED_MODE_SELECT */
853 3824 static void inv_predict_11(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
854 const uint8_t *p_t, const uint8_t *p_tr)
855 {
856 3824 int diff = (FFABS(p_l[0] - p_tl[0]) - FFABS(p_t[0] - p_tl[0])) +
857 3824 (FFABS(p_l[1] - p_tl[1]) - FFABS(p_t[1] - p_tl[1])) +
858 3824 (FFABS(p_l[2] - p_tl[2]) - FFABS(p_t[2] - p_tl[2])) +
859 3824 (FFABS(p_l[3] - p_tl[3]) - FFABS(p_t[3] - p_tl[3]));
860
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 3824 if (diff <= 0)
861 2602 AV_COPY32(p, p_t);
862 else
863 1222 AV_COPY32(p, p_l);
864 3824 }
865
866 /* PRED_MODE_ADD_SUBTRACT_FULL */
867 ✗ static void inv_predict_12(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
868 const uint8_t *p_t, const uint8_t *p_tr)
869 {
870 ✗ p[0] = av_clip_uint8(p_l[0] + p_t[0] - p_tl[0]);
871 ✗ p[1] = av_clip_uint8(p_l[1] + p_t[1] - p_tl[1]);
872 ✗ p[2] = av_clip_uint8(p_l[2] + p_t[2] - p_tl[2]);
873 ✗ p[3] = av_clip_uint8(p_l[3] + p_t[3] - p_tl[3]);
874 ✗ }
875
876 2048 static av_always_inline uint8_t clamp_add_subtract_half(int a, int b, int c)
877 {
878 2048 int d = a + b >> 1;
879 2048 return av_clip_uint8(d + (d - c) / 2);
880 }
881
882 /* PRED_MODE_ADD_SUBTRACT_HALF */
883 512 static void inv_predict_13(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
884 const uint8_t *p_t, const uint8_t *p_tr)
885 {
886 512 p[0] = clamp_add_subtract_half(p_l[0], p_t[0], p_tl[0]);
887 512 p[1] = clamp_add_subtract_half(p_l[1], p_t[1], p_tl[1]);
888 512 p[2] = clamp_add_subtract_half(p_l[2], p_t[2], p_tl[2]);
889 512 p[3] = clamp_add_subtract_half(p_l[3], p_t[3], p_tl[3]);
890 512 }
891
892 typedef void (*inv_predict_func)(uint8_t *p, const uint8_t *p_l,
893 const uint8_t *p_tl, const uint8_t *p_t,
894 const uint8_t *p_tr);
895
896 static const inv_predict_func inverse_predict[14] = {
897 inv_predict_0, inv_predict_1, inv_predict_2, inv_predict_3,
898 inv_predict_4, inv_predict_5, inv_predict_6, inv_predict_7,
899 inv_predict_8, inv_predict_9, inv_predict_10, inv_predict_11,
900 inv_predict_12, inv_predict_13,
901 };
902
903 66316 static void inverse_prediction(AVFrame *frame, enum PredictionMode m, int x, int y)
904 {
905 uint8_t *dec, *p_l, *p_tl, *p_t, *p_tr;
906 uint8_t p[4];
907
908 66316 dec = GET_PIXEL(frame, x, y);
909 66316 p_l = GET_PIXEL(frame, x - 1, y);
910 66316 p_tl = GET_PIXEL(frame, x - 1, y - 1);
911 66316 p_t = GET_PIXEL(frame, x, y - 1);
912
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 66316 if (x == frame->width - 1)
913 512 p_tr = GET_PIXEL(frame, 0, y);
914 else
915 65804 p_tr = GET_PIXEL(frame, x + 1, y - 1);
916
917 66316 inverse_predict[m](p, p_l, p_tl, p_t, p_tr);
918
919 66316 dec[0] += p[0];
920 66316 dec[1] += p[1];
921 66316 dec[2] += p[2];
922 66316 dec[3] += p[3];
923 66316 }
924
925 6 static int apply_predictor_transform(WebPContext *s)
926 {
927 6 ImageContext *img = &s->image[IMAGE_ROLE_ARGB];
928 6 ImageContext *pimg = &s->image[IMAGE_ROLE_PREDICTOR];
929 int x, y;
930
931
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 578 for (y = 0; y < img->frame->height; y++) {
932
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 66888 for (x = 0; x < s->reduced_width; x++) {
933 66316 int tx = x >> pimg->size_reduction;
934 66316 int ty = y >> pimg->size_reduction;
935 66316 enum PredictionMode m = GET_PIXEL_COMP(pimg->frame, tx, ty, 2);
936
937
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 66316 if (x == 0) {
938
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 572 if (y == 0)
939 6 m = PRED_MODE_BLACK;
940 else
941 566 m = PRED_MODE_T;
942
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 65744 } else if (y == 0)
943 532 m = PRED_MODE_L;
944
945
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 66316 if (m > 13) {
946 ✗ av_log(s->avctx, AV_LOG_ERROR,
947 "invalid predictor mode: %d\n", m);
948 ✗ return AVERROR_INVALIDDATA;
949 }
950 66316 inverse_prediction(img->frame, m, x, y);
951 }
952 }
953 6 return 0;
954 }
955
956 196608 static av_always_inline uint8_t color_transform_delta(uint8_t color_pred,
957 uint8_t color)
958 {
959 196608 return (int)ff_u8_to_s8(color_pred) * ff_u8_to_s8(color) >> 5;
960 }
961
962 4 static int apply_color_transform(WebPContext *s)
963 {
964 ImageContext *img, *cimg;
965 int x, y, cx, cy;
966 uint8_t *p, *cp;
967
968 4 img = &s->image[IMAGE_ROLE_ARGB];
969 4 cimg = &s->image[IMAGE_ROLE_COLOR_TRANSFORM];
970
971
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 516 for (y = 0; y < img->frame->height; y++) {
972
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 66048 for (x = 0; x < s->reduced_width; x++) {
973 65536 cx = x >> cimg->size_reduction;
974 65536 cy = y >> cimg->size_reduction;
975 65536 cp = GET_PIXEL(cimg->frame, cx, cy);
976 65536 p = GET_PIXEL(img->frame, x, y);
977
978 65536 p[1] += color_transform_delta(cp[3], p[2]);
979 65536 p[3] += color_transform_delta(cp[2], p[2]) +
980 65536 color_transform_delta(cp[1], p[1]);
981 }
982 }
983 4 return 0;
984 }
985
986 4 static int apply_subtract_green_transform(WebPContext *s)
987 {
988 int x, y;
989 4 ImageContext *img = &s->image[IMAGE_ROLE_ARGB];
990
991
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 516 for (y = 0; y < img->frame->height; y++) {
992
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 66048 for (x = 0; x < s->reduced_width; x++) {
993 65536 uint8_t *p = GET_PIXEL(img->frame, x, y);
994 65536 p[1] += p[2];
995 65536 p[3] += p[2];
996 }
997 }
998 4 return 0;
999 }
1000
1001 8 static int apply_color_indexing_transform(WebPContext *s)
1002 {
1003 ImageContext *img;
1004 ImageContext *pal;
1005 int i, x, y;
1006 uint8_t *p;
1007
1008 8 img = &s->image[IMAGE_ROLE_ARGB];
1009 8 pal = &s->image[IMAGE_ROLE_COLOR_INDEXING];
1010
1011
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 8 if (pal->size_reduction > 0) { // undo pixel packing
1012 GetBitContext gb_g;
1013 uint8_t *line;
1014 4 int pixel_bits = 8 >> pal->size_reduction;
1015
1016 4 line = av_malloc(img->frame->linesize[0] + AV_INPUT_BUFFER_PADDING_SIZE);
1017
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 4 if (!line)
1018 ✗ return AVERROR(ENOMEM);
1019
1020
2/2
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 80 for (y = 0; y < img->frame->height; y++) {
1021 76 p = GET_PIXEL(img->frame, 0, y);
1022 76 memcpy(line, p, img->frame->linesize[0]);
1023 76 init_get_bits(&gb_g, line, img->frame->linesize[0] * 8);
1024 76 skip_bits(&gb_g, 16);
1025 76 i = 0;
1026
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 6268 for (x = 0; x < img->frame->width; x++) {
1027 6192 p = GET_PIXEL(img->frame, x, y);
1028 6192 p[2] = get_bits(&gb_g, pixel_bits);
1029 6192 i++;
1030
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 6192 if (i == 1 << pal->size_reduction) {
1031 768 skip_bits(&gb_g, 24);
1032 768 i = 0;
1033 }
1034 }
1035 }
1036 4 av_free(line);
1037 4 s->reduced_width = s->width; // we are back to full size
1038 }
1039
1040 // switch to local palette if it's worth initializing it
1041
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 8 if (img->frame->height * img->frame->width > 300) {
1042 uint8_t palette[256 * 4];
1043 2 const int size = pal->frame->width * 4;
1044
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 2 av_assert0(size <= 1024U);
1045 2 memcpy(palette, GET_PIXEL(pal->frame, 0, 0), size); // copy palette
1046 // set extra entries to transparent black
1047 2 memset(palette + size, 0, 256 * 4 - size);
1048
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 62 for (y = 0; y < img->frame->height; y++) {
1049
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 6060 for (x = 0; x < img->frame->width; x++) {
1050 6000 p = GET_PIXEL(img->frame, x, y);
1051 6000 i = p[2];
1052 6000 AV_COPY32(p, &palette[i * 4]);
1053 }
1054 }
1055 } else {
1056
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 54 for (y = 0; y < img->frame->height; y++) {
1057
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 624 for (x = 0; x < img->frame->width; x++) {
1058 576 p = GET_PIXEL(img->frame, x, y);
1059 576 i = p[2];
1060
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 576 if (i >= pal->frame->width) {
1061 ✗ AV_WB32(p, 0x00000000);
1062 } else {
1063 576 const uint8_t *pi = GET_PIXEL(pal->frame, i, 0);
1064 576 AV_COPY32(p, pi);
1065 }
1066 }
1067 }
1068 }
1069
1070 8 return 0;
1071 }
1072
1073 16 static void update_canvas_size(AVCodecContext *avctx, int w, int h)
1074 {
1075 16 WebPContext *s = avctx->priv_data;
1076
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 16 if (s->width && s->width != w) {
1077 ✗ av_log(avctx, AV_LOG_WARNING, "Width mismatch. %d != %d\n",
1078 s->width, w);
1079 }
1080 16 s->width = w;
1081
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 16 if (s->height && s->height != h) {
1082 ✗ av_log(avctx, AV_LOG_WARNING, "Height mismatch. %d != %d\n",
1083 s->height, h);
1084 }
1085 16 s->height = h;
1086 16 }
1087
1088 12 static int vp8_lossless_decode_frame(AVCodecContext *avctx, AVFrame *p,
1089 int *got_frame, const uint8_t *data_start,
1090 unsigned int data_size, int is_alpha_chunk)
1091 {
1092 12 WebPContext *s = avctx->priv_data;
1093 int w, h, ret, i, used;
1094
1095
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 12 if (!is_alpha_chunk)
1096 10 avctx->pix_fmt = AV_PIX_FMT_ARGB;
1097
1098 12 ret = init_get_bits8(&s->gb, data_start, data_size);
1099
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 12 if (ret < 0)
1100 ✗ return ret;
1101
1102
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 12 if (!is_alpha_chunk) {
1103
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 10 if (get_bits(&s->gb, 8) != 0x2F) {
1104 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid WebP Lossless signature\n");
1105 ✗ return AVERROR_INVALIDDATA;
1106 }
1107
1108 10 w = get_bits(&s->gb, 14) + 1;
1109 10 h = get_bits(&s->gb, 14) + 1;
1110
1111 10 update_canvas_size(avctx, w, h);
1112
1113 10 ret = ff_set_dimensions(avctx, s->width, s->height);
1114
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 10 if (ret < 0)
1115 ✗ return ret;
1116
1117 10 s->has_alpha = get_bits1(&s->gb);
1118
1119
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 10 if (get_bits(&s->gb, 3) != 0x0) {
1120 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid WebP Lossless version\n");
1121 ✗ return AVERROR_INVALIDDATA;
1122 }
1123 } else {
1124
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 2 if (!s->width || !s->height)
1125 ✗ return AVERROR_BUG;
1126 2 w = s->width;
1127 2 h = s->height;
1128 }
1129
1130 /* parse transformations */
1131 12 s->nb_transforms = 0;
1132 12 s->reduced_width = s->width;
1133 12 used = 0;
1134
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 34 while (get_bits1(&s->gb)) {
1135 22 enum TransformType transform = get_bits(&s->gb, 2);
1136
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 22 if (used & (1 << transform)) {
1137 ✗ av_log(avctx, AV_LOG_ERROR, "Transform %d used more than once\n",
1138 transform);
1139 ✗ ret = AVERROR_INVALIDDATA;
1140 ✗ goto free_and_return;
1141 }
1142 22 used |= (1 << transform);
1143 22 s->transforms[s->nb_transforms++] = transform;
1144
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 22 switch (transform) {
1145 6 case PREDICTOR_TRANSFORM:
1146 6 ret = parse_transform_predictor(s);
1147 6 break;
1148 4 case COLOR_TRANSFORM:
1149 4 ret = parse_transform_color(s);
1150 4 break;
1151 8 case COLOR_INDEXING_TRANSFORM:
1152 8 ret = parse_transform_color_indexing(s);
1153 8 break;
1154 }
1155
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 22 if (ret < 0)
1156 ✗ goto free_and_return;
1157 }
1158
1159 /* decode primary image */
1160 12 s->image[IMAGE_ROLE_ARGB].frame = p;
1161
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 12 if (is_alpha_chunk)
1162 2 s->image[IMAGE_ROLE_ARGB].is_alpha_primary = 1;
1163 12 ret = decode_entropy_coded_image(s, IMAGE_ROLE_ARGB, w, h);
1164
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 12 if (ret < 0)
1165 ✗ goto free_and_return;
1166
1167 /* apply transformations */
1168
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 34 for (i = s->nb_transforms - 1; i >= 0; i--) {
1169
4/5
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✓ Branch 3 taken 8 times.
✗ Branch 4 not taken.
 22 switch (s->transforms[i]) {
1170 6 case PREDICTOR_TRANSFORM:
1171 6 ret = apply_predictor_transform(s);
1172 6 break;
1173 4 case COLOR_TRANSFORM:
1174 4 ret = apply_color_transform(s);
1175 4 break;
1176 4 case SUBTRACT_GREEN:
1177 4 ret = apply_subtract_green_transform(s);
1178 4 break;
1179 8 case COLOR_INDEXING_TRANSFORM:
1180 8 ret = apply_color_indexing_transform(s);
1181 8 break;
1182 }
1183
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✓ Branch 1 taken 22 times.
 22 if (ret < 0)
1184 ✗ goto free_and_return;
1185 }
1186
1187 12 *got_frame = 1;
1188 12 p->pict_type = AV_PICTURE_TYPE_I;
1189 12 p->flags |= AV_FRAME_FLAG_KEY;
1190 12 p->flags |= AV_FRAME_FLAG_LOSSLESS;
1191 12 ret = data_size;
1192
1193 12 free_and_return:
1194
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 72 for (i = 0; i < IMAGE_ROLE_NB; i++)
1195 60 image_ctx_free(&s->image[i]);
1196
1197 12 return ret;
1198 }
1199
1200 ✗ static void alpha_inverse_prediction(AVFrame *frame, enum AlphaFilter m)
1201 {
1202 int x, y, ls;
1203 uint8_t *dec;
1204
1205 ✗ ls = frame->linesize[3];
1206
1207 /* filter first row using horizontal filter */
1208 ✗ dec = frame->data[3] + 1;
1209 ✗ for (x = 1; x < frame->width; x++, dec++)
1210 ✗ *dec += *(dec - 1);
1211
1212 /* filter first column using vertical filter */
1213 ✗ dec = frame->data[3] + ls;
1214 ✗ for (y = 1; y < frame->height; y++, dec += ls)
1215 ✗ *dec += *(dec - ls);
1216
1217 /* filter the rest using the specified filter */
1218 ✗ switch (m) {
1219 ✗ case ALPHA_FILTER_HORIZONTAL:
1220 ✗ for (y = 1; y < frame->height; y++) {
1221 ✗ dec = frame->data[3] + y * ls + 1;
1222 ✗ for (x = 1; x < frame->width; x++, dec++)
1223 ✗ *dec += *(dec - 1);
1224 }
1225 ✗ break;
1226 ✗ case ALPHA_FILTER_VERTICAL:
1227 ✗ for (y = 1; y < frame->height; y++) {
1228 ✗ dec = frame->data[3] + y * ls + 1;
1229 ✗ for (x = 1; x < frame->width; x++, dec++)
1230 ✗ *dec += *(dec - ls);
1231 }
1232 ✗ break;
1233 ✗ case ALPHA_FILTER_GRADIENT:
1234 ✗ for (y = 1; y < frame->height; y++) {
1235 ✗ dec = frame->data[3] + y * ls + 1;
1236 ✗ for (x = 1; x < frame->width; x++, dec++)
1237 ✗ dec[0] += av_clip_uint8(*(dec - 1) + *(dec - ls) - *(dec - ls - 1));
1238 }
1239 ✗ break;
1240 }
1241 ✗ }
1242
1243 2 static int vp8_lossy_decode_alpha(AVCodecContext *avctx, AVFrame *p,
1244 const uint8_t *data_start,
1245 unsigned int data_size)
1246 {
1247 2 WebPContext *s = avctx->priv_data;
1248 int x, y, ret;
1249
1250
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 2 if (s->alpha_compression == ALPHA_COMPRESSION_NONE) {
1251 GetByteContext gb;
1252
1253 ✗ bytestream2_init(&gb, data_start, data_size);
1254 ✗ for (y = 0; y < s->height; y++)
1255 ✗ bytestream2_get_buffer(&gb, p->data[3] + p->linesize[3] * y,
1256 ✗ s->width);
1257
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✗ Branch 1 not taken.
 2 } else if (s->alpha_compression == ALPHA_COMPRESSION_VP8L) {
1258 uint8_t *ap, *pp;
1259 2 int alpha_got_frame = 0;
1260
1261 2 s->alpha_frame = av_frame_alloc();
1262
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 2 if (!s->alpha_frame)
1263 ✗ return AVERROR(ENOMEM);
1264
1265 2 ret = vp8_lossless_decode_frame(avctx, s->alpha_frame, &alpha_got_frame,
1266 data_start, data_size, 1);
1267
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 2 if (ret < 0) {
1268 ✗ av_frame_free(&s->alpha_frame);
1269 ✗ return ret;
1270 }
1271
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 2 if (!alpha_got_frame) {
1272 ✗ av_frame_free(&s->alpha_frame);
1273 ✗ return AVERROR_INVALIDDATA;
1274 }
1275
1276 /* copy green component of alpha image to alpha plane of primary image */
1277
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 18 for (y = 0; y < s->height; y++) {
1278 16 ap = GET_PIXEL(s->alpha_frame, 0, y) + 2;
1279 16 pp = p->data[3] + p->linesize[3] * y;
1280
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 208 for (x = 0; x < s->width; x++) {
1281 192 *pp = *ap;
1282 192 pp++;
1283 192 ap += 4;
1284 }
1285 }
1286 2 av_frame_free(&s->alpha_frame);
1287 }
1288
1289 /* apply alpha filtering */
1290
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 2 if (s->alpha_filter)
1291 ✗ alpha_inverse_prediction(p, s->alpha_filter);
1292
1293 2 return 0;
1294 }
1295
1296 6 static int vp8_lossy_decode_frame(AVCodecContext *avctx, AVFrame *p,
1297 int *got_frame, uint8_t *data_start,
1298 unsigned int data_size)
1299 {
1300 6 WebPContext *s = avctx->priv_data;
1301 int ret;
1302
1303
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✗ Branch 1 not taken.
 6 if (!s->initialized) {
1304 6 ff_vp8_decode_init(avctx);
1305 6 s->initialized = 1;
1306 6 s->v.actually_webp = 1;
1307 }
1308
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 6 avctx->pix_fmt = s->has_alpha ? AV_PIX_FMT_YUVA420P : AV_PIX_FMT_YUV420P;
1309
1310
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 6 if (data_size > INT_MAX) {
1311 ✗ av_log(avctx, AV_LOG_ERROR, "unsupported chunk size\n");
1312 ✗ return AVERROR_PATCHWELCOME;
1313 }
1314
1315 6 av_packet_unref(s->pkt);
1316 6 s->pkt->data = data_start;
1317 6 s->pkt->size = data_size;
1318
1319 6 ret = ff_vp8_decode_frame(avctx, p, got_frame, s->pkt);
1320
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 6 if (ret < 0)
1321 ✗ return ret;
1322
1323
1/2
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 6 if (!*got_frame)
1324 ✗ return AVERROR_INVALIDDATA;
1325
1326 6 update_canvas_size(avctx, avctx->width, avctx->height);
1327
1328
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 6 if (s->has_alpha) {
1329 2 ret = vp8_lossy_decode_alpha(avctx, p, s->alpha_data,
1330 2 s->alpha_data_size);
1331
1/2
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 2 if (ret < 0)
1332 ✗ return ret;
1333 }
1334 6 return ret;
1335 }
1336
1337 16 static int webp_decode_frame(AVCodecContext *avctx, AVFrame *p,
1338 int *got_frame, AVPacket *avpkt)
1339 {
1340 16 WebPContext *s = avctx->priv_data;
1341 GetByteContext gb;
1342 int ret;
1343 uint32_t chunk_type, chunk_size;
1344 16 int vp8x_flags = 0;
1345
1346 16 s->avctx = avctx;
1347 16 s->width = 0;
1348 16 s->height = 0;
1349 16 *got_frame = 0;
1350 16 s->has_alpha = 0;
1351 16 s->has_exif = 0;
1352 16 s->has_iccp = 0;
1353 16 bytestream2_init(&gb, avpkt->data, avpkt->size);
1354
1355
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 16 if (bytestream2_get_bytes_left(&gb) < 12)
1356 ✗ return AVERROR_INVALIDDATA;
1357
1358
1/2
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 16 if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) {
1359 ✗ av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
1360 ✗ return AVERROR_INVALIDDATA;
1361 }
1362
1363 16 chunk_size = bytestream2_get_le32(&gb);
1364
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 16 if (bytestream2_get_bytes_left(&gb) < chunk_size)
1365 ✗ return AVERROR_INVALIDDATA;
1366
1367
1/2
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 16 if (bytestream2_get_le32(&gb) != MKTAG('W', 'E', 'B', 'P')) {
1368 ✗ av_log(avctx, AV_LOG_ERROR, "missing WEBP tag\n");
1369 ✗ return AVERROR_INVALIDDATA;
1370 }
1371
1372
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 40 while (bytestream2_get_bytes_left(&gb) > 8) {
1373 24 chunk_type = bytestream2_get_le32(&gb);
1374 24 chunk_size = bytestream2_get_le32(&gb);
1375
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 24 if (chunk_size == UINT32_MAX)
1376 ✗ return AVERROR_INVALIDDATA;
1377 24 chunk_size += chunk_size & 1;
1378
1379
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 24 if (bytestream2_get_bytes_left(&gb) < chunk_size) {
1380 /* we seem to be running out of data, but it could also be that the
1381 bitstream has trailing junk leading to bogus chunk_size. */
1382 ✗ break;
1383 }
1384
1385
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 24 switch (chunk_type) {
1386 6 case MKTAG('V', 'P', '8', ' '):
1387
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✗ Branch 1 not taken.
 6 if (!*got_frame) {
1388 6 ret = vp8_lossy_decode_frame(avctx, p, got_frame,
1389 6 avpkt->data + bytestream2_tell(&gb),
1390 chunk_size);
1391
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 6 if (ret < 0)
1392 ✗ return ret;
1393 }
1394 6 bytestream2_skip(&gb, chunk_size);
1395 24 break;
1396 10 case MKTAG('V', 'P', '8', 'L'):
1397
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✗ Branch 1 not taken.
 10 if (!*got_frame) {
1398 10 ret = vp8_lossless_decode_frame(avctx, p, got_frame,
1399 10 avpkt->data + bytestream2_tell(&gb),
1400 chunk_size, 0);
1401
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 10 if (ret < 0)
1402 ✗ return ret;
1403 #if FF_API_CODEC_PROPS
1404 FF_DISABLE_DEPRECATION_WARNINGS
1405 10 avctx->properties |= FF_CODEC_PROPERTY_LOSSLESS;
1406 FF_ENABLE_DEPRECATION_WARNINGS
1407 #endif
1408 }
1409 10 bytestream2_skip(&gb, chunk_size);
1410 10 break;
1411 4 case MKTAG('V', 'P', '8', 'X'):
1412
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 4 if (s->width || s->height || *got_frame) {
1413 ✗ av_log(avctx, AV_LOG_ERROR, "Canvas dimensions are already set\n");
1414 ✗ return AVERROR_INVALIDDATA;
1415 }
1416 4 vp8x_flags = bytestream2_get_byte(&gb);
1417 4 bytestream2_skip(&gb, 3);
1418 4 s->width = bytestream2_get_le24(&gb) + 1;
1419 4 s->height = bytestream2_get_le24(&gb) + 1;
1420 4 ret = av_image_check_size(s->width, s->height, 0, avctx);
1421
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 4 if (ret < 0)
1422 ✗ return ret;
1423 4 break;
1424 2 case MKTAG('A', 'L', 'P', 'H'): {
1425 int alpha_header, filter_m, compression;
1426
1427
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 2 if (!(vp8x_flags & VP8X_FLAG_ALPHA)) {
1428 ✗ av_log(avctx, AV_LOG_WARNING,
1429 "ALPHA chunk present, but alpha bit not set in the "
1430 "VP8X header\n");
1431 }
1432
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 2 if (chunk_size == 0) {
1433 ✗ av_log(avctx, AV_LOG_ERROR, "invalid ALPHA chunk size\n");
1434 ✗ return AVERROR_INVALIDDATA;
1435 }
1436 2 alpha_header = bytestream2_get_byte(&gb);
1437 2 s->alpha_data = avpkt->data + bytestream2_tell(&gb);
1438 2 s->alpha_data_size = chunk_size - 1;
1439 2 bytestream2_skip(&gb, s->alpha_data_size);
1440
1441 2 filter_m = (alpha_header >> 2) & 0x03;
1442 2 compression = alpha_header & 0x03;
1443
1444
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 2 if (compression > ALPHA_COMPRESSION_VP8L) {
1445 ✗ av_log(avctx, AV_LOG_VERBOSE,
1446 "skipping unsupported ALPHA chunk\n");
1447 } else {
1448 2 s->has_alpha = 1;
1449 2 s->alpha_compression = compression;
1450 2 s->alpha_filter = filter_m;
1451 }
1452
1453 2 break;
1454 }
1455 2 case MKTAG('E', 'X', 'I', 'F'): {
1456 2 AVBufferRef *exif_buf = NULL;
1457
1458
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 2 if (s->has_exif) {
1459 ✗ av_log(avctx, AV_LOG_VERBOSE, "Ignoring extra EXIF chunk\n");
1460 ✗ goto exif_end;
1461 }
1462
1463
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 2 if (!(vp8x_flags & VP8X_FLAG_EXIF_METADATA))
1464 ✗ av_log(avctx, AV_LOG_WARNING,
1465 "EXIF chunk present, but Exif bit not set in the "
1466 "VP8X header\n");
1467
1468 2 exif_buf = av_buffer_alloc(chunk_size);
1469
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 2 if (!exif_buf) {
1470 ✗ av_log(avctx, AV_LOG_WARNING, "unable to allocate EXIF buffer\n");
1471 ✗ goto exif_end;
1472 }
1473 2 s->has_exif = 1;
1474 2 memcpy(exif_buf->data, gb.buffer, chunk_size);
1475
1476 2 ret = ff_decode_exif_attach_buffer(avctx, p, &exif_buf, AV_EXIF_TIFF_HEADER);
1477
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 2 if (ret < 0)
1478 ✗ av_log(avctx, AV_LOG_WARNING, "unable to attach EXIF buffer\n");
1479
1480 2 exif_end:
1481 2 bytestream2_skip(&gb, chunk_size);
1482 2 break;
1483 }
1484 ✗ case MKTAG('I', 'C', 'C', 'P'): {
1485 AVFrameSideData *sd;
1486
1487 ✗ if (s->has_iccp) {
1488 ✗ av_log(avctx, AV_LOG_VERBOSE, "Ignoring extra ICCP chunk\n");
1489 ✗ bytestream2_skip(&gb, chunk_size);
1490 ✗ break;
1491 }
1492 ✗ if (!(vp8x_flags & VP8X_FLAG_ICC))
1493 ✗ av_log(avctx, AV_LOG_WARNING,
1494 "ICCP chunk present, but ICC Profile bit not set in the "
1495 "VP8X header\n");
1496
1497 ✗ s->has_iccp = 1;
1498
1499 ✗ ret = ff_frame_new_side_data(avctx, p, AV_FRAME_DATA_ICC_PROFILE, chunk_size, &sd);
1500 ✗ if (ret < 0)
1501 ✗ return ret;
1502
1503 ✗ if (sd) {
1504 ✗ bytestream2_get_buffer(&gb, sd->data, chunk_size);
1505 } else {
1506 ✗ bytestream2_skip(&gb, chunk_size);
1507 }
1508 ✗ break;
1509 }
1510 ✗ case MKTAG('A', 'N', 'I', 'M'):
1511 case MKTAG('A', 'N', 'M', 'F'):
1512 case MKTAG('X', 'M', 'P', ' '):
1513 ✗ av_log(avctx, AV_LOG_WARNING, "skipping unsupported chunk: %s\n",
1514 ✗ av_fourcc2str(chunk_type));
1515 ✗ bytestream2_skip(&gb, chunk_size);
1516 ✗ break;
1517 ✗ default:
1518 ✗ av_log(avctx, AV_LOG_VERBOSE, "skipping unknown chunk: %s\n",
1519 ✗ av_fourcc2str(chunk_type));
1520 ✗ bytestream2_skip(&gb, chunk_size);
1521 ✗ break;
1522 }
1523 }
1524
1525
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 16 if (!*got_frame) {
1526 ✗ av_log(avctx, AV_LOG_ERROR, "image data not found\n");
1527 ✗ return AVERROR_INVALIDDATA;
1528 }
1529
1530 16 return avpkt->size;
1531 }
1532
1533 16 static av_cold int webp_decode_init(AVCodecContext *avctx)
1534 {
1535 16 WebPContext *s = avctx->priv_data;
1536
1537 16 s->pkt = av_packet_alloc();
1538
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 16 if (!s->pkt)
1539 ✗ return AVERROR(ENOMEM);
1540
1541 16 return 0;
1542 }
1543
1544 16 static av_cold int webp_decode_close(AVCodecContext *avctx)
1545 {
1546 16 WebPContext *s = avctx->priv_data;
1547
1548 16 av_packet_free(&s->pkt);
1549
1550
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 16 if (s->initialized)
1551 6 return ff_vp8_decode_free(avctx);
1552
1553 10 return 0;
1554 }
1555
1556 const FFCodec ff_webp_decoder = {
1557 .p.name = "webp",
1558 CODEC_LONG_NAME("WebP image"),
1559 .p.type = AVMEDIA_TYPE_VIDEO,
1560 .p.id = AV_CODEC_ID_WEBP,
1561 .priv_data_size = sizeof(WebPContext),
1562 .init = webp_decode_init,
1563 FF_CODEC_DECODE_CB(webp_decode_frame),
1564 .close = webp_decode_close,
1565 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
1566 .caps_internal = FF_CODEC_CAP_ICC_PROFILES |
1567 FF_CODEC_CAP_USES_PROGRESSFRAMES,
1568 };
1569