FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/webp.c
Date: 2025-04-25 22:50:00
Exec Total Coverage
Lines: 616 798 77.2%
Functions: 38 41 92.7%
Branches: 256 383 66.8%
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.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
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 160 if (nb_codes <= 1) {
279 ✗ if (nb_codes == 1) {
280 /* special-case 1 symbol since the vlc reader cannot handle it */
281 ✗ r->nb_symbols = 1;
282 ✗ r->simple = 1;
283 ✗ r->simple_symbols[0] = syms[0];
284 }
285 // No symbols
286 ✗ return AVERROR_INVALIDDATA;
287 }
288 160 ret = ff_vlc_init_from_lengths(&r->vlc, 8, nb_codes, lens, 1,
289 syms, 2, 2, 0, VLC_INIT_OUTPUT_LE, logctx);
290
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 160 if (ret < 0)
291 ✗ return ret;
292 160 r->simple = 0;
293
294 160 return 0;
295 }
296
297 130 static void read_huffman_code_simple(WebPContext *s, HuffReader *hc)
298 {
299 130 hc->nb_symbols = get_bits1(&s->gb) + 1;
300
301
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 130 if (get_bits1(&s->gb))
302 18 hc->simple_symbols[0] = get_bits(&s->gb, 8);
303 else
304 112 hc->simple_symbols[0] = get_bits1(&s->gb);
305
306
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 130 if (hc->nb_symbols == 2)
307 14 hc->simple_symbols[1] = get_bits(&s->gb, 8);
308
309 130 hc->simple = 1;
310 130 }
311
312 80 static int read_huffman_code_normal(WebPContext *s, HuffReader *hc,
313 int alphabet_size)
314 {
315 80 HuffReader code_len_hc = { { 0 }, 0, 0, { 0 } };
316 uint8_t *code_lengths;
317 80 uint8_t code_length_code_lengths[NUM_CODE_LENGTH_CODES] = { 0 };
318 uint8_t reordered_code_length_code_lengths[NUM_CODE_LENGTH_CODES];
319 uint16_t reordered_code_length_syms[NUM_CODE_LENGTH_CODES];
320 80 uint16_t len_counts[MAX_HUFFMAN_CODE_LENGTH + 1] = { 0 };
321 int symbol, max_symbol, prev_code_len, ret;
322 80 int num_codes = 4 + get_bits(&s->gb, 4);
323
324 av_assert1(num_codes <= NUM_CODE_LENGTH_CODES);
325
326
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 1180 for (int i = 0; i < num_codes; i++) {
327 1100 unsigned len = get_bits(&s->gb, 3);
328 1100 code_length_code_lengths[code_length_code_order[i]] = len;
329 1100 len_counts[len]++;
330 }
331
332
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 80 if (get_bits1(&s->gb)) {
333 8 int bits = 2 + 2 * get_bits(&s->gb, 3);
334 8 max_symbol = 2 + get_bits(&s->gb, bits);
335
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 8 if (max_symbol > alphabet_size) {
336 ✗ av_log(s->avctx, AV_LOG_ERROR, "max symbol %d > alphabet size %d\n",
337 max_symbol, alphabet_size);
338 ✗ return AVERROR_INVALIDDATA;
339 }
340 } else {
341 72 max_symbol = alphabet_size;
342 }
343
344 80 ret = huff_reader_build_canonical(&code_len_hc, code_length_code_lengths, len_counts,
345 reordered_code_length_code_lengths,
346 reordered_code_length_syms,
347 80 NUM_CODE_LENGTH_CODES, s->avctx);
348
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 80 if (ret < 0)
349 ✗ return ret;
350
351 80 code_lengths = av_malloc_array(alphabet_size, 2 * sizeof(uint8_t) + sizeof(uint16_t));
352
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 80 if (!code_lengths) {
353 ✗ ret = AVERROR(ENOMEM);
354 ✗ goto finish;
355 }
356
357 80 prev_code_len = 8;
358 80 symbol = 0;
359 80 memset(len_counts, 0, sizeof(len_counts));
360
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 3336 while (symbol < alphabet_size) {
361 int code_len;
362
363
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 3264 if (!max_symbol--)
364 8 break;
365 3256 code_len = huff_reader_get_symbol(&code_len_hc, &s->gb);
366
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 3256 if (code_len < 16U) {
367 /* Code length code [0..15] indicates literal code lengths. */
368 1938 code_lengths[symbol++] = code_len;
369 1938 len_counts[code_len]++;
370
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 1938 if (code_len)
371 1818 prev_code_len = code_len;
372 } else {
373 1318 int repeat = 0, length = 0;
374
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 1318 switch (code_len) {
375 ✗ default:
376 ✗ ret = AVERROR_INVALIDDATA;
377 ✗ goto finish;
378 888 case 16:
379 /* Code 16 repeats the previous non-zero value [3..6] times,
380 * i.e., 3 + ReadBits(2) times. If code 16 is used before a
381 * non-zero value has been emitted, a value of 8 is repeated. */
382 888 repeat = 3 + get_bits(&s->gb, 2);
383 888 length = prev_code_len;
384 888 len_counts[length] += repeat;
385 888 break;
386 160 case 17:
387 /* Code 17 emits a streak of zeros [3..10], i.e.,
388 * 3 + ReadBits(3) times. */
389 160 repeat = 3 + get_bits(&s->gb, 3);
390 160 break;
391 270 case 18:
392 /* Code 18 emits a streak of zeros of length [11..138], i.e.,
393 * 11 + ReadBits(7) times. */
394 270 repeat = 11 + get_bits(&s->gb, 7);
395 270 break;
396 }
397
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 1318 if (symbol + repeat > alphabet_size) {
398 ✗ av_log(s->avctx, AV_LOG_ERROR,
399 "invalid symbol %d + repeat %d > alphabet size %d\n",
400 symbol, repeat, alphabet_size);
401 ✗ ret = AVERROR_INVALIDDATA;
402 ✗ goto finish;
403 }
404
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 19910 while (repeat-- > 0)
405 18592 code_lengths[symbol++] = length;
406 }
407 }
408
409 80 ret = huff_reader_build_canonical(hc, code_lengths, len_counts,
410 code_lengths + symbol,
411 80 (uint16_t*)(code_lengths + 2 * symbol),
412 80 symbol, s->avctx);
413
414 80 finish:
415 80 ff_vlc_free(&code_len_hc.vlc);
416 80 av_free(code_lengths);
417 80 return ret;
418 }
419
420 static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role,
421 int w, int h);
422
423 #define PARSE_BLOCK_SIZE(w, h) do { \
424 block_bits = get_bits(&s->gb, 3) + 2; \
425 blocks_w = FFALIGN((w), 1 << block_bits) >> block_bits; \
426 blocks_h = FFALIGN((h), 1 << block_bits) >> block_bits; \
427 } while (0)
428
429 4 static int decode_entropy_image(WebPContext *s)
430 {
431 ImageContext *img;
432 int ret, block_bits, blocks_w, blocks_h, x, y, max;
433
434 4 PARSE_BLOCK_SIZE(s->reduced_width, s->height);
435
436 4 ret = decode_entropy_coded_image(s, IMAGE_ROLE_ENTROPY, blocks_w, blocks_h);
437
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 4 if (ret < 0)
438 ✗ return ret;
439
440 4 img = &s->image[IMAGE_ROLE_ENTROPY];
441 4 img->size_reduction = block_bits;
442
443 /* the number of huffman groups is determined by the maximum group number
444 * coded in the entropy image */
445 4 max = 0;
446
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 68 for (y = 0; y < img->frame->height; y++) {
447
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 1088 for (x = 0; x < img->frame->width; x++) {
448 1024 int p0 = GET_PIXEL_COMP(img->frame, x, y, 1);
449 1024 int p1 = GET_PIXEL_COMP(img->frame, x, y, 2);
450 1024 int p = p0 << 8 | p1;
451 1024 max = FFMAX(max, p);
452 }
453 }
454 4 s->nb_huffman_groups = max + 1;
455
456 4 return 0;
457 }
458
459 6 static int parse_transform_predictor(WebPContext *s)
460 {
461 int block_bits, blocks_w, blocks_h, ret;
462
463 6 PARSE_BLOCK_SIZE(s->reduced_width, s->height);
464
465 6 ret = decode_entropy_coded_image(s, IMAGE_ROLE_PREDICTOR, blocks_w,
466 blocks_h);
467
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 6 if (ret < 0)
468 ✗ return ret;
469
470 6 s->image[IMAGE_ROLE_PREDICTOR].size_reduction = block_bits;
471
472 6 return 0;
473 }
474
475 4 static int parse_transform_color(WebPContext *s)
476 {
477 int block_bits, blocks_w, blocks_h, ret;
478
479 4 PARSE_BLOCK_SIZE(s->reduced_width, s->height);
480
481 4 ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_TRANSFORM, blocks_w,
482 blocks_h);
483
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 4 if (ret < 0)
484 ✗ return ret;
485
486 4 s->image[IMAGE_ROLE_COLOR_TRANSFORM].size_reduction = block_bits;
487
488 4 return 0;
489 }
490
491 8 static int parse_transform_color_indexing(WebPContext *s)
492 {
493 ImageContext *img;
494 int width_bits, index_size, ret, x;
495 uint8_t *ct;
496
497 8 index_size = get_bits(&s->gb, 8) + 1;
498
499
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 8 if (index_size <= 2)
500 2 width_bits = 3;
501
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 6 else if (index_size <= 4)
502 2 width_bits = 2;
503
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 4 else if (index_size <= 16)
504 ✗ width_bits = 1;
505 else
506 4 width_bits = 0;
507
508 8 ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_INDEXING,
509 index_size, 1);
510
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 8 if (ret < 0)
511 ✗ return ret;
512
513 8 img = &s->image[IMAGE_ROLE_COLOR_INDEXING];
514 8 img->size_reduction = width_bits;
515
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 8 if (width_bits > 0)
516 4 s->reduced_width = (s->width + ((1 << width_bits) - 1)) >> width_bits;
517
518 /* color index values are delta-coded */
519 8 ct = img->frame->data[0] + 4;
520
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 1432 for (x = 4; x < img->frame->width * 4; x++, ct++)
521 1424 ct[0] += ct[-4];
522
523 8 return 0;
524 }
525
526 69356 static HuffReader *get_huffman_group(WebPContext *s, ImageContext *img,
527 int x, int y)
528 {
529 69356 ImageContext *gimg = &s->image[IMAGE_ROLE_ENTROPY];
530 69356 int group = 0;
531
532
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 69356 if (gimg->size_reduction > 0) {
533 65536 int group_x = x >> gimg->size_reduction;
534 65536 int group_y = y >> gimg->size_reduction;
535 65536 int g0 = GET_PIXEL_COMP(gimg->frame, group_x, group_y, 1);
536 65536 int g1 = GET_PIXEL_COMP(gimg->frame, group_x, group_y, 2);
537 65536 group = g0 << 8 | g1;
538 }
539
540 69356 return &img->huffman_groups[group * HUFFMAN_CODES_PER_META_CODE];
541 }
542
543 ✗ static av_always_inline void color_cache_put(ImageContext *img, uint32_t c)
544 {
545 ✗ uint32_t cache_idx = (0x1E35A7BD * c) >> (32 - img->color_cache_bits);
546 ✗ img->color_cache[cache_idx] = c;
547 ✗ }
548
549 34 static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role,
550 int w, int h)
551 {
552 ImageContext *img;
553 HuffReader *hg;
554 int i, j, ret, x, y, width;
555
556 34 img = &s->image[role];
557 34 img->role = role;
558
559
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 34 if (!img->frame) {
560 22 img->frame = av_frame_alloc();
561
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 22 if (!img->frame)
562 ✗ return AVERROR(ENOMEM);
563 }
564
565 34 img->frame->format = AV_PIX_FMT_ARGB;
566 34 img->frame->width = w;
567 34 img->frame->height = h;
568
569
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 34 if (role == IMAGE_ROLE_ARGB && !img->is_alpha_primary) {
570 10 ret = ff_thread_get_buffer(s->avctx, img->frame, 0);
571 } else
572 24 ret = av_frame_get_buffer(img->frame, 1);
573
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 34 if (ret < 0)
574 ✗ return ret;
575
576
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 34 if (get_bits1(&s->gb)) {
577 ✗ img->color_cache_bits = get_bits(&s->gb, 4);
578 ✗ if (img->color_cache_bits < 1 || img->color_cache_bits > 11) {
579 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid color cache bits: %d\n",
580 img->color_cache_bits);
581 ✗ return AVERROR_INVALIDDATA;
582 }
583 ✗ img->color_cache = av_calloc(1 << img->color_cache_bits,
584 sizeof(*img->color_cache));
585 ✗ if (!img->color_cache)
586 ✗ return AVERROR(ENOMEM);
587 } else {
588 34 img->color_cache_bits = 0;
589 }
590
591 34 img->nb_huffman_groups = 1;
592
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 34 if (role == IMAGE_ROLE_ARGB && get_bits1(&s->gb)) {
593 4 ret = decode_entropy_image(s);
594
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 4 if (ret < 0)
595 ✗ return ret;
596 4 img->nb_huffman_groups = s->nb_huffman_groups;
597 }
598 34 img->huffman_groups = av_calloc(img->nb_huffman_groups,
599 HUFFMAN_CODES_PER_META_CODE *
600 sizeof(*img->huffman_groups));
601
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 34 if (!img->huffman_groups)
602 ✗ return AVERROR(ENOMEM);
603
604
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 76 for (i = 0; i < img->nb_huffman_groups; i++) {
605 42 hg = &img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE];
606
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 252 for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++) {
607 210 int alphabet_size = alphabet_sizes[j];
608
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 210 if (!j && img->color_cache_bits > 0)
609 ✗ alphabet_size += 1 << img->color_cache_bits;
610
611
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 210 if (get_bits1(&s->gb)) {
612 130 read_huffman_code_simple(s, &hg[j]);
613 } else {
614 80 ret = read_huffman_code_normal(s, &hg[j], alphabet_size);
615
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 80 if (ret < 0)
616 ✗ return ret;
617 }
618 }
619 }
620
621 34 width = img->frame->width;
622
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 34 if (role == IMAGE_ROLE_ARGB)
623 12 width = s->reduced_width;
624
625 34 x = 0; y = 0;
626
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 69390 while (y < img->frame->height) {
627 int v;
628
629
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 69356 if (get_bits_left(&s->gb) < 0)
630 ✗ return AVERROR_INVALIDDATA;
631
632 69356 hg = get_huffman_group(s, img, x, y);
633 69356 v = huff_reader_get_symbol(&hg[HUFF_IDX_GREEN], &s->gb);
634
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 69356 if (v < NUM_LITERAL_CODES) {
635 /* literal pixel values */
636 69230 uint8_t *p = GET_PIXEL(img->frame, x, y);
637 69230 p[2] = v;
638 69230 p[1] = huff_reader_get_symbol(&hg[HUFF_IDX_RED], &s->gb);
639 69230 p[3] = huff_reader_get_symbol(&hg[HUFF_IDX_BLUE], &s->gb);
640 69230 p[0] = huff_reader_get_symbol(&hg[HUFF_IDX_ALPHA], &s->gb);
641
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 69230 if (img->color_cache_bits)
642 ✗ color_cache_put(img, AV_RB32(p));
643 69230 x++;
644
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 69230 if (x == width) {
645 750 x = 0;
646 750 y++;
647 }
648
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 126 } else if (v < NUM_LITERAL_CODES + NUM_LENGTH_CODES) {
649 /* LZ77 backwards mapping */
650 int prefix_code, length, distance, ref_x, ref_y;
651
652 /* parse length and distance */
653 126 prefix_code = v - NUM_LITERAL_CODES;
654
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 126 if (prefix_code < 4) {
655 48 length = prefix_code + 1;
656 } else {
657 78 int extra_bits = (prefix_code - 2) >> 1;
658 78 int offset = 2 + (prefix_code & 1) << extra_bits;
659 78 length = offset + get_bits(&s->gb, extra_bits) + 1;
660 }
661 126 prefix_code = huff_reader_get_symbol(&hg[HUFF_IDX_DIST], &s->gb);
662
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 126 if (prefix_code > 39U) {
663 ✗ av_log(s->avctx, AV_LOG_ERROR,
664 "distance prefix code too large: %d\n", prefix_code);
665 ✗ return AVERROR_INVALIDDATA;
666 }
667
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 126 if (prefix_code < 4) {
668 126 distance = prefix_code + 1;
669 } else {
670 ✗ int extra_bits = prefix_code - 2 >> 1;
671 ✗ int offset = 2 + (prefix_code & 1) << extra_bits;
672 ✗ distance = offset + get_bits(&s->gb, extra_bits) + 1;
673 }
674
675 /* find reference location */
676
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 126 if (distance <= NUM_SHORT_DISTANCES) {
677 126 int xi = lz77_distance_offsets[distance - 1][0];
678 126 int yi = lz77_distance_offsets[distance - 1][1];
679 126 distance = FFMAX(1, xi + yi * width);
680 } else {
681 ✗ distance -= NUM_SHORT_DISTANCES;
682 }
683 126 ref_x = x;
684 126 ref_y = y;
685
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 126 if (distance <= x) {
686 40 ref_x -= distance;
687 40 distance = 0;
688 } else {
689 86 ref_x = 0;
690 86 distance -= x;
691 }
692
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 148 while (distance >= width) {
693 22 ref_y--;
694 22 distance -= width;
695 }
696
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 126 if (distance > 0) {
697 64 ref_x = width - distance;
698 64 ref_y--;
699 }
700 126 ref_x = FFMAX(0, ref_x);
701 126 ref_y = FFMAX(0, ref_y);
702
703
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 126 if (ref_y == y && ref_x >= x)
704 ✗ return AVERROR_INVALIDDATA;
705
706 /* copy pixels
707 * source and dest regions can overlap and wrap lines, so just
708 * copy per-pixel */
709
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 1076 for (i = 0; i < length; i++) {
710 958 uint8_t *p_ref = GET_PIXEL(img->frame, ref_x, ref_y);
711 958 uint8_t *p = GET_PIXEL(img->frame, x, y);
712
713 958 AV_COPY32(p, p_ref);
714
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 958 if (img->color_cache_bits)
715 ✗ color_cache_put(img, AV_RB32(p));
716 958 x++;
717 958 ref_x++;
718
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 958 if (x == width) {
719 74 x = 0;
720 74 y++;
721 }
722
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 958 if (ref_x == width) {
723 72 ref_x = 0;
724 72 ref_y++;
725 }
726
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 958 if (y == img->frame->height || ref_y == img->frame->height)
727 break;
728 }
729 } else {
730 /* read from color cache */
731 ✗ uint8_t *p = GET_PIXEL(img->frame, x, y);
732 ✗ int cache_idx = v - (NUM_LITERAL_CODES + NUM_LENGTH_CODES);
733
734 ✗ if (!img->color_cache_bits) {
735 ✗ av_log(s->avctx, AV_LOG_ERROR, "color cache not found\n");
736 ✗ return AVERROR_INVALIDDATA;
737 }
738 ✗ if (cache_idx >= 1 << img->color_cache_bits) {
739 ✗ av_log(s->avctx, AV_LOG_ERROR,
740 "color cache index out-of-bounds\n");
741 ✗ return AVERROR_INVALIDDATA;
742 }
743 ✗ AV_WB32(p, img->color_cache[cache_idx]);
744 ✗ x++;
745 ✗ if (x == width) {
746 ✗ x = 0;
747 ✗ y++;
748 }
749 }
750 }
751
752 34 return 0;
753 }
754
755 /* PRED_MODE_BLACK */
756 6 static void inv_predict_0(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
757 const uint8_t *p_t, const uint8_t *p_tr)
758 {
759 6 AV_WB32(p, 0xFF000000);
760 6 }
761
762 /* PRED_MODE_L */
763 5300 static void inv_predict_1(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
764 const uint8_t *p_t, const uint8_t *p_tr)
765 {
766 5300 AV_COPY32(p, p_l);
767 5300 }
768
769 /* PRED_MODE_T */
770 21182 static void inv_predict_2(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
771 const uint8_t *p_t, const uint8_t *p_tr)
772 {
773 21182 AV_COPY32(p, p_t);
774 21182 }
775
776 /* PRED_MODE_TR */
777 6336 static void inv_predict_3(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
778 const uint8_t *p_t, const uint8_t *p_tr)
779 {
780 6336 AV_COPY32(p, p_tr);
781 6336 }
782
783 /* PRED_MODE_TL */
784 1248 static void inv_predict_4(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
785 const uint8_t *p_t, const uint8_t *p_tr)
786 {
787 1248 AV_COPY32(p, p_tl);
788 1248 }
789
790 /* PRED_MODE_AVG_T_AVG_L_TR */
791 4832 static void inv_predict_5(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
792 const uint8_t *p_t, const uint8_t *p_tr)
793 {
794 4832 p[0] = p_t[0] + (p_l[0] + p_tr[0] >> 1) >> 1;
795 4832 p[1] = p_t[1] + (p_l[1] + p_tr[1] >> 1) >> 1;
796 4832 p[2] = p_t[2] + (p_l[2] + p_tr[2] >> 1) >> 1;
797 4832 p[3] = p_t[3] + (p_l[3] + p_tr[3] >> 1) >> 1;
798 4832 }
799
800 /* PRED_MODE_AVG_L_TL */
801 768 static void inv_predict_6(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
802 const uint8_t *p_t, const uint8_t *p_tr)
803 {
804 768 p[0] = p_l[0] + p_tl[0] >> 1;
805 768 p[1] = p_l[1] + p_tl[1] >> 1;
806 768 p[2] = p_l[2] + p_tl[2] >> 1;
807 768 p[3] = p_l[3] + p_tl[3] >> 1;
808 768 }
809
810 /* PRED_MODE_AVG_L_T */
811 3072 static void inv_predict_7(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
812 const uint8_t *p_t, const uint8_t *p_tr)
813 {
814 3072 p[0] = p_l[0] + p_t[0] >> 1;
815 3072 p[1] = p_l[1] + p_t[1] >> 1;
816 3072 p[2] = p_l[2] + p_t[2] >> 1;
817 3072 p[3] = p_l[3] + p_t[3] >> 1;
818 3072 }
819
820 /* PRED_MODE_AVG_TL_T */
821 4512 static void inv_predict_8(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
822 const uint8_t *p_t, const uint8_t *p_tr)
823 {
824 4512 p[0] = p_tl[0] + p_t[0] >> 1;
825 4512 p[1] = p_tl[1] + p_t[1] >> 1;
826 4512 p[2] = p_tl[2] + p_t[2] >> 1;
827 4512 p[3] = p_tl[3] + p_t[3] >> 1;
828 4512 }
829
830 /* PRED_MODE_AVG_T_TR */
831 11488 static void inv_predict_9(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
832 const uint8_t *p_t, const uint8_t *p_tr)
833 {
834 11488 p[0] = p_t[0] + p_tr[0] >> 1;
835 11488 p[1] = p_t[1] + p_tr[1] >> 1;
836 11488 p[2] = p_t[2] + p_tr[2] >> 1;
837 11488 p[3] = p_t[3] + p_tr[3] >> 1;
838 11488 }
839
840 /* PRED_MODE_AVG_AVG_L_TL_AVG_T_TR */
841 3236 static void inv_predict_10(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
842 const uint8_t *p_t, const uint8_t *p_tr)
843 {
844 3236 p[0] = (p_l[0] + p_tl[0] >> 1) + (p_t[0] + p_tr[0] >> 1) >> 1;
845 3236 p[1] = (p_l[1] + p_tl[1] >> 1) + (p_t[1] + p_tr[1] >> 1) >> 1;
846 3236 p[2] = (p_l[2] + p_tl[2] >> 1) + (p_t[2] + p_tr[2] >> 1) >> 1;
847 3236 p[3] = (p_l[3] + p_tl[3] >> 1) + (p_t[3] + p_tr[3] >> 1) >> 1;
848 3236 }
849
850 /* PRED_MODE_SELECT */
851 3824 static void inv_predict_11(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
852 const uint8_t *p_t, const uint8_t *p_tr)
853 {
854 3824 int diff = (FFABS(p_l[0] - p_tl[0]) - FFABS(p_t[0] - p_tl[0])) +
855 3824 (FFABS(p_l[1] - p_tl[1]) - FFABS(p_t[1] - p_tl[1])) +
856 3824 (FFABS(p_l[2] - p_tl[2]) - FFABS(p_t[2] - p_tl[2])) +
857 3824 (FFABS(p_l[3] - p_tl[3]) - FFABS(p_t[3] - p_tl[3]));
858
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 3824 if (diff <= 0)
859 2602 AV_COPY32(p, p_t);
860 else
861 1222 AV_COPY32(p, p_l);
862 3824 }
863
864 /* PRED_MODE_ADD_SUBTRACT_FULL */
865 ✗ static void inv_predict_12(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
866 const uint8_t *p_t, const uint8_t *p_tr)
867 {
868 ✗ p[0] = av_clip_uint8(p_l[0] + p_t[0] - p_tl[0]);
869 ✗ p[1] = av_clip_uint8(p_l[1] + p_t[1] - p_tl[1]);
870 ✗ p[2] = av_clip_uint8(p_l[2] + p_t[2] - p_tl[2]);
871 ✗ p[3] = av_clip_uint8(p_l[3] + p_t[3] - p_tl[3]);
872 ✗ }
873
874 2048 static av_always_inline uint8_t clamp_add_subtract_half(int a, int b, int c)
875 {
876 2048 int d = a + b >> 1;
877 2048 return av_clip_uint8(d + (d - c) / 2);
878 }
879
880 /* PRED_MODE_ADD_SUBTRACT_HALF */
881 512 static void inv_predict_13(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
882 const uint8_t *p_t, const uint8_t *p_tr)
883 {
884 512 p[0] = clamp_add_subtract_half(p_l[0], p_t[0], p_tl[0]);
885 512 p[1] = clamp_add_subtract_half(p_l[1], p_t[1], p_tl[1]);
886 512 p[2] = clamp_add_subtract_half(p_l[2], p_t[2], p_tl[2]);
887 512 p[3] = clamp_add_subtract_half(p_l[3], p_t[3], p_tl[3]);
888 512 }
889
890 typedef void (*inv_predict_func)(uint8_t *p, const uint8_t *p_l,
891 const uint8_t *p_tl, const uint8_t *p_t,
892 const uint8_t *p_tr);
893
894 static const inv_predict_func inverse_predict[14] = {
895 inv_predict_0, inv_predict_1, inv_predict_2, inv_predict_3,
896 inv_predict_4, inv_predict_5, inv_predict_6, inv_predict_7,
897 inv_predict_8, inv_predict_9, inv_predict_10, inv_predict_11,
898 inv_predict_12, inv_predict_13,
899 };
900
901 66316 static void inverse_prediction(AVFrame *frame, enum PredictionMode m, int x, int y)
902 {
903 uint8_t *dec, *p_l, *p_tl, *p_t, *p_tr;
904 uint8_t p[4];
905
906 66316 dec = GET_PIXEL(frame, x, y);
907 66316 p_l = GET_PIXEL(frame, x - 1, y);
908 66316 p_tl = GET_PIXEL(frame, x - 1, y - 1);
909 66316 p_t = GET_PIXEL(frame, x, y - 1);
910
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 66316 if (x == frame->width - 1)
911 512 p_tr = GET_PIXEL(frame, 0, y);
912 else
913 65804 p_tr = GET_PIXEL(frame, x + 1, y - 1);
914
915 66316 inverse_predict[m](p, p_l, p_tl, p_t, p_tr);
916
917 66316 dec[0] += p[0];
918 66316 dec[1] += p[1];
919 66316 dec[2] += p[2];
920 66316 dec[3] += p[3];
921 66316 }
922
923 6 static int apply_predictor_transform(WebPContext *s)
924 {
925 6 ImageContext *img = &s->image[IMAGE_ROLE_ARGB];
926 6 ImageContext *pimg = &s->image[IMAGE_ROLE_PREDICTOR];
927 int x, y;
928
929
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 578 for (y = 0; y < img->frame->height; y++) {
930
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 66888 for (x = 0; x < s->reduced_width; x++) {
931 66316 int tx = x >> pimg->size_reduction;
932 66316 int ty = y >> pimg->size_reduction;
933 66316 enum PredictionMode m = GET_PIXEL_COMP(pimg->frame, tx, ty, 2);
934
935
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 66316 if (x == 0) {
936
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 572 if (y == 0)
937 6 m = PRED_MODE_BLACK;
938 else
939 566 m = PRED_MODE_T;
940
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 65744 } else if (y == 0)
941 532 m = PRED_MODE_L;
942
943
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 66316 if (m > 13) {
944 ✗ av_log(s->avctx, AV_LOG_ERROR,
945 "invalid predictor mode: %d\n", m);
946 ✗ return AVERROR_INVALIDDATA;
947 }
948 66316 inverse_prediction(img->frame, m, x, y);
949 }
950 }
951 6 return 0;
952 }
953
954 196608 static av_always_inline uint8_t color_transform_delta(uint8_t color_pred,
955 uint8_t color)
956 {
957 196608 return (int)ff_u8_to_s8(color_pred) * ff_u8_to_s8(color) >> 5;
958 }
959
960 4 static int apply_color_transform(WebPContext *s)
961 {
962 ImageContext *img, *cimg;
963 int x, y, cx, cy;
964 uint8_t *p, *cp;
965
966 4 img = &s->image[IMAGE_ROLE_ARGB];
967 4 cimg = &s->image[IMAGE_ROLE_COLOR_TRANSFORM];
968
969
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 516 for (y = 0; y < img->frame->height; y++) {
970
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 66048 for (x = 0; x < s->reduced_width; x++) {
971 65536 cx = x >> cimg->size_reduction;
972 65536 cy = y >> cimg->size_reduction;
973 65536 cp = GET_PIXEL(cimg->frame, cx, cy);
974 65536 p = GET_PIXEL(img->frame, x, y);
975
976 65536 p[1] += color_transform_delta(cp[3], p[2]);
977 65536 p[3] += color_transform_delta(cp[2], p[2]) +
978 65536 color_transform_delta(cp[1], p[1]);
979 }
980 }
981 4 return 0;
982 }
983
984 4 static int apply_subtract_green_transform(WebPContext *s)
985 {
986 int x, y;
987 4 ImageContext *img = &s->image[IMAGE_ROLE_ARGB];
988
989
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 516 for (y = 0; y < img->frame->height; y++) {
990
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 66048 for (x = 0; x < s->reduced_width; x++) {
991 65536 uint8_t *p = GET_PIXEL(img->frame, x, y);
992 65536 p[1] += p[2];
993 65536 p[3] += p[2];
994 }
995 }
996 4 return 0;
997 }
998
999 8 static int apply_color_indexing_transform(WebPContext *s)
1000 {
1001 ImageContext *img;
1002 ImageContext *pal;
1003 int i, x, y;
1004 uint8_t *p;
1005
1006 8 img = &s->image[IMAGE_ROLE_ARGB];
1007 8 pal = &s->image[IMAGE_ROLE_COLOR_INDEXING];
1008
1009
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 8 if (pal->size_reduction > 0) { // undo pixel packing
1010 GetBitContext gb_g;
1011 uint8_t *line;
1012 4 int pixel_bits = 8 >> pal->size_reduction;
1013
1014 4 line = av_malloc(img->frame->linesize[0] + AV_INPUT_BUFFER_PADDING_SIZE);
1015
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 4 if (!line)
1016 ✗ return AVERROR(ENOMEM);
1017
1018
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 80 for (y = 0; y < img->frame->height; y++) {
1019 76 p = GET_PIXEL(img->frame, 0, y);
1020 76 memcpy(line, p, img->frame->linesize[0]);
1021 76 init_get_bits(&gb_g, line, img->frame->linesize[0] * 8);
1022 76 skip_bits(&gb_g, 16);
1023 76 i = 0;
1024
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 6268 for (x = 0; x < img->frame->width; x++) {
1025 6192 p = GET_PIXEL(img->frame, x, y);
1026 6192 p[2] = get_bits(&gb_g, pixel_bits);
1027 6192 i++;
1028
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 6192 if (i == 1 << pal->size_reduction) {
1029 768 skip_bits(&gb_g, 24);
1030 768 i = 0;
1031 }
1032 }
1033 }
1034 4 av_free(line);
1035 4 s->reduced_width = s->width; // we are back to full size
1036 }
1037
1038 // switch to local palette if it's worth initializing it
1039
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 8 if (img->frame->height * img->frame->width > 300) {
1040 uint8_t palette[256 * 4];
1041 2 const int size = pal->frame->width * 4;
1042
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 2 av_assert0(size <= 1024U);
1043 2 memcpy(palette, GET_PIXEL(pal->frame, 0, 0), size); // copy palette
1044 // set extra entries to transparent black
1045 2 memset(palette + size, 0, 256 * 4 - size);
1046
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 62 for (y = 0; y < img->frame->height; y++) {
1047
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 6060 for (x = 0; x < img->frame->width; x++) {
1048 6000 p = GET_PIXEL(img->frame, x, y);
1049 6000 i = p[2];
1050 6000 AV_COPY32(p, &palette[i * 4]);
1051 }
1052 }
1053 } else {
1054
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 54 for (y = 0; y < img->frame->height; y++) {
1055
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 624 for (x = 0; x < img->frame->width; x++) {
1056 576 p = GET_PIXEL(img->frame, x, y);
1057 576 i = p[2];
1058
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 576 if (i >= pal->frame->width) {
1059 ✗ AV_WB32(p, 0x00000000);
1060 } else {
1061 576 const uint8_t *pi = GET_PIXEL(pal->frame, i, 0);
1062 576 AV_COPY32(p, pi);
1063 }
1064 }
1065 }
1066 }
1067
1068 8 return 0;
1069 }
1070
1071 16 static void update_canvas_size(AVCodecContext *avctx, int w, int h)
1072 {
1073 16 WebPContext *s = avctx->priv_data;
1074
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 16 if (s->width && s->width != w) {
1075 ✗ av_log(avctx, AV_LOG_WARNING, "Width mismatch. %d != %d\n",
1076 s->width, w);
1077 }
1078 16 s->width = w;
1079
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 16 if (s->height && s->height != h) {
1080 ✗ av_log(avctx, AV_LOG_WARNING, "Height mismatch. %d != %d\n",
1081 s->height, h);
1082 }
1083 16 s->height = h;
1084 16 }
1085
1086 12 static int vp8_lossless_decode_frame(AVCodecContext *avctx, AVFrame *p,
1087 int *got_frame, const uint8_t *data_start,
1088 unsigned int data_size, int is_alpha_chunk)
1089 {
1090 12 WebPContext *s = avctx->priv_data;
1091 int w, h, ret, i, used;
1092
1093
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 12 if (!is_alpha_chunk) {
1094 10 s->lossless = 1;
1095 10 avctx->pix_fmt = AV_PIX_FMT_ARGB;
1096 }
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
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 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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 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 6 s->lossless = 0;
1310
1311
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 6 if (data_size > INT_MAX) {
1312 ✗ av_log(avctx, AV_LOG_ERROR, "unsupported chunk size\n");
1313 ✗ return AVERROR_PATCHWELCOME;
1314 }
1315
1316 6 av_packet_unref(s->pkt);
1317 6 s->pkt->data = data_start;
1318 6 s->pkt->size = data_size;
1319
1320 6 ret = ff_vp8_decode_frame(avctx, p, got_frame, s->pkt);
1321
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 6 if (ret < 0)
1322 ✗ return ret;
1323
1324
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 6 if (!*got_frame)
1325 ✗ return AVERROR_INVALIDDATA;
1326
1327 6 update_canvas_size(avctx, avctx->width, avctx->height);
1328
1329
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 6 if (s->has_alpha) {
1330 2 ret = vp8_lossy_decode_alpha(avctx, p, s->alpha_data,
1331 2 s->alpha_data_size);
1332
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 2 if (ret < 0)
1333 ✗ return ret;
1334 }
1335 6 return ret;
1336 }
1337
1338 16 static int webp_decode_frame(AVCodecContext *avctx, AVFrame *p,
1339 int *got_frame, AVPacket *avpkt)
1340 {
1341 16 WebPContext *s = avctx->priv_data;
1342 GetByteContext gb;
1343 int ret;
1344 uint32_t chunk_type, chunk_size;
1345 16 int vp8x_flags = 0;
1346
1347 16 s->avctx = avctx;
1348 16 s->width = 0;
1349 16 s->height = 0;
1350 16 *got_frame = 0;
1351 16 s->has_alpha = 0;
1352 16 s->has_exif = 0;
1353 16 s->has_iccp = 0;
1354 16 bytestream2_init(&gb, avpkt->data, avpkt->size);
1355
1356
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 16 if (bytestream2_get_bytes_left(&gb) < 12)
1357 ✗ return AVERROR_INVALIDDATA;
1358
1359
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 16 if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) {
1360 ✗ av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
1361 ✗ return AVERROR_INVALIDDATA;
1362 }
1363
1364 16 chunk_size = bytestream2_get_le32(&gb);
1365
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 16 if (bytestream2_get_bytes_left(&gb) < chunk_size)
1366 ✗ return AVERROR_INVALIDDATA;
1367
1368
1/2
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 16 if (bytestream2_get_le32(&gb) != MKTAG('W', 'E', 'B', 'P')) {
1369 ✗ av_log(avctx, AV_LOG_ERROR, "missing WEBP tag\n");
1370 ✗ return AVERROR_INVALIDDATA;
1371 }
1372
1373
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 40 while (bytestream2_get_bytes_left(&gb) > 8) {
1374 24 char chunk_str[5] = { 0 };
1375
1376 24 chunk_type = bytestream2_get_le32(&gb);
1377 24 chunk_size = bytestream2_get_le32(&gb);
1378
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 24 if (chunk_size == UINT32_MAX)
1379 ✗ return AVERROR_INVALIDDATA;
1380 24 chunk_size += chunk_size & 1;
1381
1382
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 24 if (bytestream2_get_bytes_left(&gb) < chunk_size) {
1383 /* we seem to be running out of data, but it could also be that the
1384 bitstream has trailing junk leading to bogus chunk_size. */
1385 ✗ break;
1386 }
1387
1388
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 24 switch (chunk_type) {
1389 6 case MKTAG('V', 'P', '8', ' '):
1390
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✗ Branch 1 not taken.
 6 if (!*got_frame) {
1391 6 ret = vp8_lossy_decode_frame(avctx, p, got_frame,
1392 6 avpkt->data + bytestream2_tell(&gb),
1393 chunk_size);
1394
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 6 if (ret < 0)
1395 ✗ return ret;
1396 }
1397 6 bytestream2_skip(&gb, chunk_size);
1398 6 break;
1399 10 case MKTAG('V', 'P', '8', 'L'):
1400
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 10 if (!*got_frame) {
1401 10 ret = vp8_lossless_decode_frame(avctx, p, got_frame,
1402 10 avpkt->data + bytestream2_tell(&gb),
1403 chunk_size, 0);
1404
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 10 if (ret < 0)
1405 ✗ return ret;
1406 #if FF_API_CODEC_PROPS
1407 FF_DISABLE_DEPRECATION_WARNINGS
1408 10 avctx->properties |= FF_CODEC_PROPERTY_LOSSLESS;
1409 FF_ENABLE_DEPRECATION_WARNINGS
1410 #endif
1411 }
1412 10 bytestream2_skip(&gb, chunk_size);
1413 10 break;
1414 4 case MKTAG('V', 'P', '8', 'X'):
1415
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 4 if (s->width || s->height || *got_frame) {
1416 ✗ av_log(avctx, AV_LOG_ERROR, "Canvas dimensions are already set\n");
1417 ✗ return AVERROR_INVALIDDATA;
1418 }
1419 4 vp8x_flags = bytestream2_get_byte(&gb);
1420 4 bytestream2_skip(&gb, 3);
1421 4 s->width = bytestream2_get_le24(&gb) + 1;
1422 4 s->height = bytestream2_get_le24(&gb) + 1;
1423 4 ret = av_image_check_size(s->width, s->height, 0, avctx);
1424
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 4 if (ret < 0)
1425 ✗ return ret;
1426 4 break;
1427 2 case MKTAG('A', 'L', 'P', 'H'): {
1428 int alpha_header, filter_m, compression;
1429
1430
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 2 if (!(vp8x_flags & VP8X_FLAG_ALPHA)) {
1431 ✗ av_log(avctx, AV_LOG_WARNING,
1432 "ALPHA chunk present, but alpha bit not set in the "
1433 "VP8X header\n");
1434 }
1435
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 2 if (chunk_size == 0) {
1436 ✗ av_log(avctx, AV_LOG_ERROR, "invalid ALPHA chunk size\n");
1437 ✗ return AVERROR_INVALIDDATA;
1438 }
1439 2 alpha_header = bytestream2_get_byte(&gb);
1440 2 s->alpha_data = avpkt->data + bytestream2_tell(&gb);
1441 2 s->alpha_data_size = chunk_size - 1;
1442 2 bytestream2_skip(&gb, s->alpha_data_size);
1443
1444 2 filter_m = (alpha_header >> 2) & 0x03;
1445 2 compression = alpha_header & 0x03;
1446
1447
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 2 if (compression > ALPHA_COMPRESSION_VP8L) {
1448 ✗ av_log(avctx, AV_LOG_VERBOSE,
1449 "skipping unsupported ALPHA chunk\n");
1450 } else {
1451 2 s->has_alpha = 1;
1452 2 s->alpha_compression = compression;
1453 2 s->alpha_filter = filter_m;
1454 }
1455
1456 2 break;
1457 }
1458 2 case MKTAG('E', 'X', 'I', 'F'): {
1459 2 int le, ifd_offset, exif_offset = bytestream2_tell(&gb);
1460 2 AVDictionary *exif_metadata = NULL;
1461 GetByteContext exif_gb;
1462
1463
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 2 if (s->has_exif) {
1464 ✗ av_log(avctx, AV_LOG_VERBOSE, "Ignoring extra EXIF chunk\n");
1465 ✗ goto exif_end;
1466 }
1467
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 2 if (!(vp8x_flags & VP8X_FLAG_EXIF_METADATA))
1468 ✗ av_log(avctx, AV_LOG_WARNING,
1469 "EXIF chunk present, but Exif bit not set in the "
1470 "VP8X header\n");
1471
1472 2 s->has_exif = 1;
1473 2 bytestream2_init(&exif_gb, avpkt->data + exif_offset,
1474 2 avpkt->size - exif_offset);
1475
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 2 if (ff_tdecode_header(&exif_gb, &le, &ifd_offset) < 0) {
1476 ✗ av_log(avctx, AV_LOG_ERROR, "invalid TIFF header "
1477 "in Exif data\n");
1478 ✗ goto exif_end;
1479 }
1480
1481 2 bytestream2_seek(&exif_gb, ifd_offset, SEEK_SET);
1482
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 2 if (ff_exif_decode_ifd(avctx, &exif_gb, le, 0, &exif_metadata) < 0) {
1483 ✗ av_log(avctx, AV_LOG_ERROR, "error decoding Exif data\n");
1484 ✗ goto exif_end;
1485 }
1486
1487 2 av_dict_copy(&p->metadata, exif_metadata, 0);
1488
1489 2 exif_end:
1490 2 av_dict_free(&exif_metadata);
1491 2 bytestream2_skip(&gb, chunk_size);
1492 2 break;
1493 }
1494 ✗ case MKTAG('I', 'C', 'C', 'P'): {
1495 AVFrameSideData *sd;
1496
1497 ✗ if (s->has_iccp) {
1498 ✗ av_log(avctx, AV_LOG_VERBOSE, "Ignoring extra ICCP chunk\n");
1499 ✗ bytestream2_skip(&gb, chunk_size);
1500 ✗ break;
1501 }
1502 ✗ if (!(vp8x_flags & VP8X_FLAG_ICC))
1503 ✗ av_log(avctx, AV_LOG_WARNING,
1504 "ICCP chunk present, but ICC Profile bit not set in the "
1505 "VP8X header\n");
1506
1507 ✗ s->has_iccp = 1;
1508
1509 ✗ ret = ff_frame_new_side_data(avctx, p, AV_FRAME_DATA_ICC_PROFILE, chunk_size, &sd);
1510 ✗ if (ret < 0)
1511 ✗ return ret;
1512
1513 ✗ if (sd) {
1514 ✗ bytestream2_get_buffer(&gb, sd->data, chunk_size);
1515 } else {
1516 ✗ bytestream2_skip(&gb, chunk_size);
1517 }
1518 ✗ break;
1519 }
1520 ✗ case MKTAG('A', 'N', 'I', 'M'):
1521 case MKTAG('A', 'N', 'M', 'F'):
1522 case MKTAG('X', 'M', 'P', ' '):
1523 ✗ AV_WL32(chunk_str, chunk_type);
1524 ✗ av_log(avctx, AV_LOG_WARNING, "skipping unsupported chunk: %s\n",
1525 chunk_str);
1526 ✗ bytestream2_skip(&gb, chunk_size);
1527 ✗ break;
1528 ✗ default:
1529 ✗ AV_WL32(chunk_str, chunk_type);
1530 ✗ av_log(avctx, AV_LOG_VERBOSE, "skipping unknown chunk: %s\n",
1531 chunk_str);
1532 ✗ bytestream2_skip(&gb, chunk_size);
1533 ✗ break;
1534 }
1535 }
1536
1537
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 16 if (!*got_frame) {
1538 ✗ av_log(avctx, AV_LOG_ERROR, "image data not found\n");
1539 ✗ return AVERROR_INVALIDDATA;
1540 }
1541
1542 16 return avpkt->size;
1543 }
1544
1545 16 static av_cold int webp_decode_init(AVCodecContext *avctx)
1546 {
1547 16 WebPContext *s = avctx->priv_data;
1548
1549 16 s->pkt = av_packet_alloc();
1550
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 16 if (!s->pkt)
1551 ✗ return AVERROR(ENOMEM);
1552
1553 16 return 0;
1554 }
1555
1556 16 static av_cold int webp_decode_close(AVCodecContext *avctx)
1557 {
1558 16 WebPContext *s = avctx->priv_data;
1559
1560 16 av_packet_free(&s->pkt);
1561
1562
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 16 if (s->initialized)
1563 6 return ff_vp8_decode_free(avctx);
1564
1565 10 return 0;
1566 }
1567
1568 const FFCodec ff_webp_decoder = {
1569 .p.name = "webp",
1570 CODEC_LONG_NAME("WebP image"),
1571 .p.type = AVMEDIA_TYPE_VIDEO,
1572 .p.id = AV_CODEC_ID_WEBP,
1573 .priv_data_size = sizeof(WebPContext),
1574 .init = webp_decode_init,
1575 FF_CODEC_DECODE_CB(webp_decode_frame),
1576 .close = webp_decode_close,
1577 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
1578 .caps_internal = FF_CODEC_CAP_ICC_PROFILES |
1579 FF_CODEC_CAP_USES_PROGRESSFRAMES,
1580 };
1581