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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 | * | |
37 | * Unimplemented: | |
38 | * - Animation | |
39 | * - ICC profile | |
40 | * - XMP metadata | |
41 | */ | |
42 | ||
43 | #define BITSTREAM_READER_LE | |
44 | #include "libavutil/imgutils.h" | |
45 | #include "avcodec.h" | |
46 | #include "bytestream.h" | |
47 | #include "exif.h" | |
48 | #include "internal.h" | |
49 | #include "get_bits.h" | |
50 | #include "thread.h" | |
51 | #include "vp8.h" | |
52 | ||
53 | #define VP8X_FLAG_ANIMATION 0x02 | |
54 | #define VP8X_FLAG_XMP_METADATA 0x04 | |
55 | #define VP8X_FLAG_EXIF_METADATA 0x08 | |
56 | #define VP8X_FLAG_ALPHA 0x10 | |
57 | #define VP8X_FLAG_ICC 0x20 | |
58 | ||
59 | #define MAX_PALETTE_SIZE 256 | |
60 | #define MAX_CACHE_BITS 11 | |
61 | #define NUM_CODE_LENGTH_CODES 19 | |
62 | #define HUFFMAN_CODES_PER_META_CODE 5 | |
63 | #define NUM_LITERAL_CODES 256 | |
64 | #define NUM_LENGTH_CODES 24 | |
65 | #define NUM_DISTANCE_CODES 40 | |
66 | #define NUM_SHORT_DISTANCES 120 | |
67 | #define MAX_HUFFMAN_CODE_LENGTH 15 | |
68 | ||
69 | static const uint16_t alphabet_sizes[HUFFMAN_CODES_PER_META_CODE] = { | |
70 | NUM_LITERAL_CODES + NUM_LENGTH_CODES, | |
71 | NUM_LITERAL_CODES, NUM_LITERAL_CODES, NUM_LITERAL_CODES, | |
72 | NUM_DISTANCE_CODES | |
73 | }; | |
74 | ||
75 | static const uint8_t code_length_code_order[NUM_CODE_LENGTH_CODES] = { | |
76 | 17, 18, 0, 1, 2, 3, 4, 5, 16, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 | |
77 | }; | |
78 | ||
79 | static const int8_t lz77_distance_offsets[NUM_SHORT_DISTANCES][2] = { | |
80 | { 0, 1 }, { 1, 0 }, { 1, 1 }, { -1, 1 }, { 0, 2 }, { 2, 0 }, { 1, 2 }, { -1, 2 }, | |
81 | { 2, 1 }, { -2, 1 }, { 2, 2 }, { -2, 2 }, { 0, 3 }, { 3, 0 }, { 1, 3 }, { -1, 3 }, | |
82 | { 3, 1 }, { -3, 1 }, { 2, 3 }, { -2, 3 }, { 3, 2 }, { -3, 2 }, { 0, 4 }, { 4, 0 }, | |
83 | { 1, 4 }, { -1, 4 }, { 4, 1 }, { -4, 1 }, { 3, 3 }, { -3, 3 }, { 2, 4 }, { -2, 4 }, | |
84 | { 4, 2 }, { -4, 2 }, { 0, 5 }, { 3, 4 }, { -3, 4 }, { 4, 3 }, { -4, 3 }, { 5, 0 }, | |
85 | { 1, 5 }, { -1, 5 }, { 5, 1 }, { -5, 1 }, { 2, 5 }, { -2, 5 }, { 5, 2 }, { -5, 2 }, | |
86 | { 4, 4 }, { -4, 4 }, { 3, 5 }, { -3, 5 }, { 5, 3 }, { -5, 3 }, { 0, 6 }, { 6, 0 }, | |
87 | { 1, 6 }, { -1, 6 }, { 6, 1 }, { -6, 1 }, { 2, 6 }, { -2, 6 }, { 6, 2 }, { -6, 2 }, | |
88 | { 4, 5 }, { -4, 5 }, { 5, 4 }, { -5, 4 }, { 3, 6 }, { -3, 6 }, { 6, 3 }, { -6, 3 }, | |
89 | { 0, 7 }, { 7, 0 }, { 1, 7 }, { -1, 7 }, { 5, 5 }, { -5, 5 }, { 7, 1 }, { -7, 1 }, | |
90 | { 4, 6 }, { -4, 6 }, { 6, 4 }, { -6, 4 }, { 2, 7 }, { -2, 7 }, { 7, 2 }, { -7, 2 }, | |
91 | { 3, 7 }, { -3, 7 }, { 7, 3 }, { -7, 3 }, { 5, 6 }, { -5, 6 }, { 6, 5 }, { -6, 5 }, | |
92 | { 8, 0 }, { 4, 7 }, { -4, 7 }, { 7, 4 }, { -7, 4 }, { 8, 1 }, { 8, 2 }, { 6, 6 }, | |
93 | { -6, 6 }, { 8, 3 }, { 5, 7 }, { -5, 7 }, { 7, 5 }, { -7, 5 }, { 8, 4 }, { 6, 7 }, | |
94 | { -6, 7 }, { 7, 6 }, { -7, 6 }, { 8, 5 }, { 7, 7 }, { -7, 7 }, { 8, 6 }, { 8, 7 } | |
95 | }; | |
96 | ||
97 | enum AlphaCompression { | |
98 | ALPHA_COMPRESSION_NONE, | |
99 | ALPHA_COMPRESSION_VP8L, | |
100 | }; | |
101 | ||
102 | enum AlphaFilter { | |
103 | ALPHA_FILTER_NONE, | |
104 | ALPHA_FILTER_HORIZONTAL, | |
105 | ALPHA_FILTER_VERTICAL, | |
106 | ALPHA_FILTER_GRADIENT, | |
107 | }; | |
108 | ||
109 | enum TransformType { | |
110 | PREDICTOR_TRANSFORM = 0, | |
111 | COLOR_TRANSFORM = 1, | |
112 | SUBTRACT_GREEN = 2, | |
113 | COLOR_INDEXING_TRANSFORM = 3, | |
114 | }; | |
115 | ||
116 | enum PredictionMode { | |
117 | PRED_MODE_BLACK, | |
118 | PRED_MODE_L, | |
119 | PRED_MODE_T, | |
120 | PRED_MODE_TR, | |
121 | PRED_MODE_TL, | |
122 | PRED_MODE_AVG_T_AVG_L_TR, | |
123 | PRED_MODE_AVG_L_TL, | |
124 | PRED_MODE_AVG_L_T, | |
125 | PRED_MODE_AVG_TL_T, | |
126 | PRED_MODE_AVG_T_TR, | |
127 | PRED_MODE_AVG_AVG_L_TL_AVG_T_TR, | |
128 | PRED_MODE_SELECT, | |
129 | PRED_MODE_ADD_SUBTRACT_FULL, | |
130 | PRED_MODE_ADD_SUBTRACT_HALF, | |
131 | }; | |
132 | ||
133 | enum HuffmanIndex { | |
134 | HUFF_IDX_GREEN = 0, | |
135 | HUFF_IDX_RED = 1, | |
136 | HUFF_IDX_BLUE = 2, | |
137 | HUFF_IDX_ALPHA = 3, | |
138 | HUFF_IDX_DIST = 4 | |
139 | }; | |
140 | ||
141 | /* The structure of WebP lossless is an optional series of transformation data, | |
142 | * followed by the primary image. The primary image also optionally contains | |
143 | * an entropy group mapping if there are multiple entropy groups. There is a | |
144 | * basic image type called an "entropy coded image" that is used for all of | |
145 | * these. The type of each entropy coded image is referred to by the | |
146 | * specification as its role. */ | |
147 | enum ImageRole { | |
148 | /* Primary Image: Stores the actual pixels of the image. */ | |
149 | IMAGE_ROLE_ARGB, | |
150 | ||
151 | /* Entropy Image: Defines which Huffman group to use for different areas of | |
152 | * the primary image. */ | |
153 | IMAGE_ROLE_ENTROPY, | |
154 | ||
155 | /* Predictors: Defines which predictor type to use for different areas of | |
156 | * the primary image. */ | |
157 | IMAGE_ROLE_PREDICTOR, | |
158 | ||
159 | /* Color Transform Data: Defines the color transformation for different | |
160 | * areas of the primary image. */ | |
161 | IMAGE_ROLE_COLOR_TRANSFORM, | |
162 | ||
163 | /* Color Index: Stored as an image of height == 1. */ | |
164 | IMAGE_ROLE_COLOR_INDEXING, | |
165 | ||
166 | IMAGE_ROLE_NB, | |
167 | }; | |
168 | ||
169 | typedef struct HuffReader { | |
170 | VLC vlc; /* Huffman decoder context */ | |
171 | int simple; /* whether to use simple mode */ | |
172 | int nb_symbols; /* number of coded symbols */ | |
173 | uint16_t simple_symbols[2]; /* symbols for simple mode */ | |
174 | } HuffReader; | |
175 | ||
176 | typedef struct ImageContext { | |
177 | enum ImageRole role; /* role of this image */ | |
178 | AVFrame *frame; /* AVFrame for data */ | |
179 | int color_cache_bits; /* color cache size, log2 */ | |
180 | uint32_t *color_cache; /* color cache data */ | |
181 | int nb_huffman_groups; /* number of huffman groups */ | |
182 | HuffReader *huffman_groups; /* reader for each huffman group */ | |
183 | int size_reduction; /* relative size compared to primary image, log2 */ | |
184 | int is_alpha_primary; | |
185 | } ImageContext; | |
186 | ||
187 | typedef struct WebPContext { | |
188 | VP8Context v; /* VP8 Context used for lossy decoding */ | |
189 | GetBitContext gb; /* bitstream reader for main image chunk */ | |
190 | AVFrame *alpha_frame; /* AVFrame for alpha data decompressed from VP8L */ | |
191 | AVCodecContext *avctx; /* parent AVCodecContext */ | |
192 | int initialized; /* set once the VP8 context is initialized */ | |
193 | int has_alpha; /* has a separate alpha chunk */ | |
194 | enum AlphaCompression alpha_compression; /* compression type for alpha chunk */ | |
195 | enum AlphaFilter alpha_filter; /* filtering method for alpha chunk */ | |
196 | uint8_t *alpha_data; /* alpha chunk data */ | |
197 | int alpha_data_size; /* alpha chunk data size */ | |
198 | int has_exif; /* set after an EXIF chunk has been processed */ | |
199 | AVDictionary *exif_metadata; /* EXIF chunk data */ | |
200 | int width; /* image width */ | |
201 | int height; /* image height */ | |
202 | int lossless; /* indicates lossless or lossy */ | |
203 | ||
204 | int nb_transforms; /* number of transforms */ | |
205 | enum TransformType transforms[4]; /* transformations used in the image, in order */ | |
206 | int reduced_width; /* reduced width for index image, if applicable */ | |
207 | int nb_huffman_groups; /* number of huffman groups in the primary image */ | |
208 | ImageContext image[IMAGE_ROLE_NB]; /* image context for each role */ | |
209 | } WebPContext; | |
210 | ||
211 | #define GET_PIXEL(frame, x, y) \ | |
212 | ((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x)) | |
213 | ||
214 | #define GET_PIXEL_COMP(frame, x, y, c) \ | |
215 | (*((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x) + c)) | |
216 | ||
217 | static void image_ctx_free(ImageContext *img) | |
218 | { | |
219 | int i, j; | |
220 | ||
221 | av_free(img->color_cache); | |
222 | if (img->role != IMAGE_ROLE_ARGB && !img->is_alpha_primary) | |
223 | av_frame_free(&img->frame); | |
224 | if (img->huffman_groups) { | |
225 | for (i = 0; i < img->nb_huffman_groups; i++) { | |
226 | for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++) | |
227 | ff_free_vlc(&img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE + j].vlc); | |
228 | } | |
229 | av_free(img->huffman_groups); | |
230 | } | |
231 | memset(img, 0, sizeof(*img)); | |
232 | } | |
233 | ||
234 | ||
235 | /* Differs from get_vlc2() in the following ways: | |
236 | * - codes are bit-reversed | |
237 | * - assumes 8-bit table to make reversal simpler | |
238 | * - assumes max depth of 2 since the max code length for WebP is 15 | |
239 | */ | |
240 | static av_always_inline int webp_get_vlc(GetBitContext *gb, VLC_TYPE (*table)[2]) | |
241 | { | |
242 | int n, nb_bits; | |
243 | unsigned int index; | |
244 | int code; | |
245 | ||
246 | OPEN_READER(re, gb); | |
247 | UPDATE_CACHE(re, gb); | |
248 | ||
249 | index = SHOW_UBITS(re, gb, 8); | |
250 | index = ff_reverse[index]; | |
251 | code = table[index][0]; | |
252 | n = table[index][1]; | |
253 | ||
254 | if (n < 0) { | |
255 | LAST_SKIP_BITS(re, gb, 8); | |
256 | UPDATE_CACHE(re, gb); | |
257 | ||
258 | nb_bits = -n; | |
259 | ||
260 | index = SHOW_UBITS(re, gb, nb_bits); | |
261 | index = (ff_reverse[index] >> (8 - nb_bits)) + code; | |
262 | code = table[index][0]; | |
263 | n = table[index][1]; | |
264 | } | |
265 | SKIP_BITS(re, gb, n); | |
266 | ||
267 | CLOSE_READER(re, gb); | |
268 | ||
269 | return code; | |
270 | } | |
271 | ||
272 | static int huff_reader_get_symbol(HuffReader *r, GetBitContext *gb) | |
273 | { | |
274 | if (r->simple) { | |
275 | if (r->nb_symbols == 1) | |
276 | return r->simple_symbols[0]; | |
277 | else | |
278 | return r->simple_symbols[get_bits1(gb)]; | |
279 | } else | |
280 | return webp_get_vlc(gb, r->vlc.table); | |
281 | } | |
282 | ||
283 | static int huff_reader_build_canonical(HuffReader *r, int *code_lengths, | |
284 | int alphabet_size) | |
285 | { | |
286 | int len = 0, sym, code = 0, ret; | |
287 | int max_code_length = 0; | |
288 | uint16_t *codes; | |
289 | ||
290 | /* special-case 1 symbol since the vlc reader cannot handle it */ | |
291 | for (sym = 0; sym < alphabet_size; sym++) { | |
292 | if (code_lengths[sym] > 0) { | |
293 | len++; | |
294 | code = sym; | |
295 | if (len > 1) | |
296 | break; | |
297 | } | |
298 | } | |
299 | if (len == 1) { | |
300 | r->nb_symbols = 1; | |
301 | r->simple_symbols[0] = code; | |
302 | r->simple = 1; | |
303 | return 0; | |
304 | } | |
305 | ||
306 | for (sym = 0; sym < alphabet_size; sym++) | |
307 | max_code_length = FFMAX(max_code_length, code_lengths[sym]); | |
308 | ||
309 | if (max_code_length == 0 || max_code_length > MAX_HUFFMAN_CODE_LENGTH) | |
310 | return AVERROR(EINVAL); | |
311 | ||
312 | codes = av_malloc_array(alphabet_size, sizeof(*codes)); | |
313 | if (!codes) | |
314 | return AVERROR(ENOMEM); | |
315 | ||
316 | code = 0; | |
317 | r->nb_symbols = 0; | |
318 | for (len = 1; len <= max_code_length; len++) { | |
319 | for (sym = 0; sym < alphabet_size; sym++) { | |
320 | if (code_lengths[sym] != len) | |
321 | continue; | |
322 | codes[sym] = code++; | |
323 | r->nb_symbols++; | |
324 | } | |
325 | code <<= 1; | |
326 | } | |
327 | if (!r->nb_symbols) { | |
328 | av_free(codes); | |
329 | return AVERROR_INVALIDDATA; | |
330 | } | |
331 | ||
332 | ret = init_vlc(&r->vlc, 8, alphabet_size, | |
333 | code_lengths, sizeof(*code_lengths), sizeof(*code_lengths), | |
334 | codes, sizeof(*codes), sizeof(*codes), 0); | |
335 | if (ret < 0) { | |
336 | av_free(codes); | |
337 | return ret; | |
338 | } | |
339 | r->simple = 0; | |
340 | ||
341 | av_free(codes); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static void read_huffman_code_simple(WebPContext *s, HuffReader *hc) | |
346 | { | |
347 | hc->nb_symbols = get_bits1(&s->gb) + 1; | |
348 | ||
349 | if (get_bits1(&s->gb)) | |
350 | hc->simple_symbols[0] = get_bits(&s->gb, 8); | |
351 | else | |
352 | hc->simple_symbols[0] = get_bits1(&s->gb); | |
353 | ||
354 | if (hc->nb_symbols == 2) | |
355 | hc->simple_symbols[1] = get_bits(&s->gb, 8); | |
356 | ||
357 | hc->simple = 1; | |
358 | } | |
359 | ||
360 | static int read_huffman_code_normal(WebPContext *s, HuffReader *hc, | |
361 | int alphabet_size) | |
362 | { | |
363 | HuffReader code_len_hc = { { 0 }, 0, 0, { 0 } }; | |
364 | int *code_lengths = NULL; | |
365 | int code_length_code_lengths[NUM_CODE_LENGTH_CODES] = { 0 }; | |
366 | int i, symbol, max_symbol, prev_code_len, ret; | |
367 | int num_codes = 4 + get_bits(&s->gb, 4); | |
368 | ||
369 | if (num_codes > NUM_CODE_LENGTH_CODES) | |
370 | return AVERROR_INVALIDDATA; | |
371 | ||
372 | for (i = 0; i < num_codes; i++) | |
373 | code_length_code_lengths[code_length_code_order[i]] = get_bits(&s->gb, 3); | |
374 | ||
375 | ret = huff_reader_build_canonical(&code_len_hc, code_length_code_lengths, | |
376 | NUM_CODE_LENGTH_CODES); | |
377 | if (ret < 0) | |
378 | goto finish; | |
379 | ||
380 | code_lengths = av_mallocz_array(alphabet_size, sizeof(*code_lengths)); | |
381 | if (!code_lengths) { | |
382 | ret = AVERROR(ENOMEM); | |
383 | goto finish; | |
384 | } | |
385 | ||
386 | if (get_bits1(&s->gb)) { | |
387 | int bits = 2 + 2 * get_bits(&s->gb, 3); | |
388 | max_symbol = 2 + get_bits(&s->gb, bits); | |
389 | if (max_symbol > alphabet_size) { | |
390 | av_log(s->avctx, AV_LOG_ERROR, "max symbol %d > alphabet size %d\n", | |
391 | max_symbol, alphabet_size); | |
392 | ret = AVERROR_INVALIDDATA; | |
393 | goto finish; | |
394 | } | |
395 | } else { | |
396 | max_symbol = alphabet_size; | |
397 | } | |
398 | ||
399 | prev_code_len = 8; | |
400 | symbol = 0; | |
401 | while (symbol < alphabet_size) { | |
402 | int code_len; | |
403 | ||
404 | if (!max_symbol--) | |
405 | break; | |
406 | code_len = huff_reader_get_symbol(&code_len_hc, &s->gb); | |
407 | if (code_len < 16) { | |
408 | /* Code length code [0..15] indicates literal code lengths. */ | |
409 | code_lengths[symbol++] = code_len; | |
410 | if (code_len) | |
411 | prev_code_len = code_len; | |
412 | } else { | |
413 | int repeat = 0, length = 0; | |
414 | switch (code_len) { | |
415 | case 16: | |
416 | /* Code 16 repeats the previous non-zero value [3..6] times, | |
417 | * i.e., 3 + ReadBits(2) times. If code 16 is used before a | |
418 | * non-zero value has been emitted, a value of 8 is repeated. */ | |
419 | repeat = 3 + get_bits(&s->gb, 2); | |
420 | length = prev_code_len; | |
421 | break; | |
422 | case 17: | |
423 | /* Code 17 emits a streak of zeros [3..10], i.e., | |
424 | * 3 + ReadBits(3) times. */ | |
425 | repeat = 3 + get_bits(&s->gb, 3); | |
426 | break; | |
427 | case 18: | |
428 | /* Code 18 emits a streak of zeros of length [11..138], i.e., | |
429 | * 11 + ReadBits(7) times. */ | |
430 | repeat = 11 + get_bits(&s->gb, 7); | |
431 | break; | |
432 | } | |
433 | if (symbol + repeat > alphabet_size) { | |
434 | av_log(s->avctx, AV_LOG_ERROR, | |
435 | "invalid symbol %d + repeat %d > alphabet size %d\n", | |
436 | symbol, repeat, alphabet_size); | |
437 | ret = AVERROR_INVALIDDATA; | |
438 | goto finish; | |
439 | } | |
440 | while (repeat-- > 0) | |
441 | code_lengths[symbol++] = length; | |
442 | } | |
443 | } | |
444 | ||
445 | ret = huff_reader_build_canonical(hc, code_lengths, alphabet_size); | |
446 | ||
447 | finish: | |
448 | ff_free_vlc(&code_len_hc.vlc); | |
449 | av_free(code_lengths); | |
450 | return ret; | |
451 | } | |
452 | ||
453 | static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role, | |
454 | int w, int h); | |
455 | ||
456 | #define PARSE_BLOCK_SIZE(w, h) do { \ | |
457 | block_bits = get_bits(&s->gb, 3) + 2; \ | |
458 | blocks_w = FFALIGN((w), 1 << block_bits) >> block_bits; \ | |
459 | blocks_h = FFALIGN((h), 1 << block_bits) >> block_bits; \ | |
460 | } while (0) | |
461 | ||
462 | static int decode_entropy_image(WebPContext *s) | |
463 | { | |
464 | ImageContext *img; | |
465 | int ret, block_bits, width, blocks_w, blocks_h, x, y, max; | |
466 | ||
467 | width = s->width; | |
468 | if (s->reduced_width > 0) | |
469 | width = s->reduced_width; | |
470 | ||
471 | PARSE_BLOCK_SIZE(width, s->height); | |
472 | ||
473 | ret = decode_entropy_coded_image(s, IMAGE_ROLE_ENTROPY, blocks_w, blocks_h); | |
474 | if (ret < 0) | |
475 | return ret; | |
476 | ||
477 | img = &s->image[IMAGE_ROLE_ENTROPY]; | |
478 | img->size_reduction = block_bits; | |
479 | ||
480 | /* the number of huffman groups is determined by the maximum group number | |
481 | * coded in the entropy image */ | |
482 | max = 0; | |
483 | for (y = 0; y < img->frame->height; y++) { | |
484 | for (x = 0; x < img->frame->width; x++) { | |
485 | int p0 = GET_PIXEL_COMP(img->frame, x, y, 1); | |
486 | int p1 = GET_PIXEL_COMP(img->frame, x, y, 2); | |
487 | int p = p0 << 8 | p1; | |
488 | max = FFMAX(max, p); | |
489 | } | |
490 | } | |
491 | s->nb_huffman_groups = max + 1; | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
496 | static int parse_transform_predictor(WebPContext *s) | |
497 | { | |
498 | int block_bits, blocks_w, blocks_h, ret; | |
499 | ||
500 | PARSE_BLOCK_SIZE(s->width, s->height); | |
501 | ||
502 | ret = decode_entropy_coded_image(s, IMAGE_ROLE_PREDICTOR, blocks_w, | |
503 | blocks_h); | |
504 | if (ret < 0) | |
505 | return ret; | |
506 | ||
507 | s->image[IMAGE_ROLE_PREDICTOR].size_reduction = block_bits; | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | static int parse_transform_color(WebPContext *s) | |
513 | { | |
514 | int block_bits, blocks_w, blocks_h, ret; | |
515 | ||
516 | PARSE_BLOCK_SIZE(s->width, s->height); | |
517 | ||
518 | ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_TRANSFORM, blocks_w, | |
519 | blocks_h); | |
520 | if (ret < 0) | |
521 | return ret; | |
522 | ||
523 | s->image[IMAGE_ROLE_COLOR_TRANSFORM].size_reduction = block_bits; | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | static int parse_transform_color_indexing(WebPContext *s) | |
529 | { | |
530 | ImageContext *img; | |
531 | int width_bits, index_size, ret, x; | |
532 | uint8_t *ct; | |
533 | ||
534 | index_size = get_bits(&s->gb, 8) + 1; | |
535 | ||
536 | if (index_size <= 2) | |
537 | width_bits = 3; | |
538 | else if (index_size <= 4) | |
539 | width_bits = 2; | |
540 | else if (index_size <= 16) | |
541 | width_bits = 1; | |
542 | else | |
543 | width_bits = 0; | |
544 | ||
545 | ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_INDEXING, | |
546 | index_size, 1); | |
547 | if (ret < 0) | |
548 | return ret; | |
549 | ||
550 | img = &s->image[IMAGE_ROLE_COLOR_INDEXING]; | |
551 | img->size_reduction = width_bits; | |
552 | if (width_bits > 0) | |
553 | s->reduced_width = (s->width + ((1 << width_bits) - 1)) >> width_bits; | |
554 | ||
555 | /* color index values are delta-coded */ | |
556 | ct = img->frame->data[0] + 4; | |
557 | for (x = 4; x < img->frame->width * 4; x++, ct++) | |
558 | ct[0] += ct[-4]; | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | static HuffReader *get_huffman_group(WebPContext *s, ImageContext *img, | |
564 | int x, int y) | |
565 | { | |
566 | ImageContext *gimg = &s->image[IMAGE_ROLE_ENTROPY]; | |
567 | int group = 0; | |
568 | ||
569 | if (gimg->size_reduction > 0) { | |
570 | int group_x = x >> gimg->size_reduction; | |
571 | int group_y = y >> gimg->size_reduction; | |
572 | int g0 = GET_PIXEL_COMP(gimg->frame, group_x, group_y, 1); | |
573 | int g1 = GET_PIXEL_COMP(gimg->frame, group_x, group_y, 2); | |
574 | group = g0 << 8 | g1; | |
575 | } | |
576 | ||
577 | return &img->huffman_groups[group * HUFFMAN_CODES_PER_META_CODE]; | |
578 | } | |
579 | ||
580 | static av_always_inline void color_cache_put(ImageContext *img, uint32_t c) | |
581 | { | |
582 | uint32_t cache_idx = (0x1E35A7BD * c) >> (32 - img->color_cache_bits); | |
583 | img->color_cache[cache_idx] = c; | |
584 | } | |
585 | ||
586 | static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role, | |
587 | int w, int h) | |
588 | { | |
589 | ImageContext *img; | |
590 | HuffReader *hg; | |
591 | int i, j, ret, x, y, width; | |
592 | ||
593 | img = &s->image[role]; | |
594 | img->role = role; | |
595 | ||
596 | if (!img->frame) { | |
597 | img->frame = av_frame_alloc(); | |
598 | if (!img->frame) | |
599 | return AVERROR(ENOMEM); | |
600 | } | |
601 | ||
602 | img->frame->format = AV_PIX_FMT_ARGB; | |
603 | img->frame->width = w; | |
604 | img->frame->height = h; | |
605 | ||
606 | if (role == IMAGE_ROLE_ARGB && !img->is_alpha_primary) { | |
607 | ThreadFrame pt = { .f = img->frame }; | |
608 | ret = ff_thread_get_buffer(s->avctx, &pt, 0); | |
609 | } else | |
610 | ret = av_frame_get_buffer(img->frame, 1); | |
611 | if (ret < 0) | |
612 | return ret; | |
613 | ||
614 | if (get_bits1(&s->gb)) { | |
615 | img->color_cache_bits = get_bits(&s->gb, 4); | |
616 | if (img->color_cache_bits < 1 || img->color_cache_bits > 11) { | |
617 | av_log(s->avctx, AV_LOG_ERROR, "invalid color cache bits: %d\n", | |
618 | img->color_cache_bits); | |
619 | return AVERROR_INVALIDDATA; | |
620 | } | |
621 | img->color_cache = av_mallocz_array(1 << img->color_cache_bits, | |
622 | sizeof(*img->color_cache)); | |
623 | if (!img->color_cache) | |
624 | return AVERROR(ENOMEM); | |
625 | } else { | |
626 | img->color_cache_bits = 0; | |
627 | } | |
628 | ||
629 | img->nb_huffman_groups = 1; | |
630 | if (role == IMAGE_ROLE_ARGB && get_bits1(&s->gb)) { | |
631 | ret = decode_entropy_image(s); | |
632 | if (ret < 0) | |
633 | return ret; | |
634 | img->nb_huffman_groups = s->nb_huffman_groups; | |
635 | } | |
636 | img->huffman_groups = av_mallocz_array(img->nb_huffman_groups * | |
637 | HUFFMAN_CODES_PER_META_CODE, | |
638 | sizeof(*img->huffman_groups)); | |
639 | if (!img->huffman_groups) | |
640 | return AVERROR(ENOMEM); | |
641 | ||
642 | for (i = 0; i < img->nb_huffman_groups; i++) { | |
643 | hg = &img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE]; | |
644 | for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++) { | |
645 | int alphabet_size = alphabet_sizes[j]; | |
646 | if (!j && img->color_cache_bits > 0) | |
647 | alphabet_size += 1 << img->color_cache_bits; | |
648 | ||
649 | if (get_bits1(&s->gb)) { | |
650 | read_huffman_code_simple(s, &hg[j]); | |
651 | } else { | |
652 | ret = read_huffman_code_normal(s, &hg[j], alphabet_size); | |
653 | if (ret < 0) | |
654 | return ret; | |
655 | } | |
656 | } | |
657 | } | |
658 | ||
659 | width = img->frame->width; | |
660 | if (role == IMAGE_ROLE_ARGB && s->reduced_width > 0) | |
661 | width = s->reduced_width; | |
662 | ||
663 | x = 0; y = 0; | |
664 | while (y < img->frame->height) { | |
665 | int v; | |
666 | ||
667 | hg = get_huffman_group(s, img, x, y); | |
668 | v = huff_reader_get_symbol(&hg[HUFF_IDX_GREEN], &s->gb); | |
669 | if (v < NUM_LITERAL_CODES) { | |
670 | /* literal pixel values */ | |
671 | uint8_t *p = GET_PIXEL(img->frame, x, y); | |
672 | p[2] = v; | |
673 | p[1] = huff_reader_get_symbol(&hg[HUFF_IDX_RED], &s->gb); | |
674 | p[3] = huff_reader_get_symbol(&hg[HUFF_IDX_BLUE], &s->gb); | |
675 | p[0] = huff_reader_get_symbol(&hg[HUFF_IDX_ALPHA], &s->gb); | |
676 | if (img->color_cache_bits) | |
677 | color_cache_put(img, AV_RB32(p)); | |
678 | x++; | |
679 | if (x == width) { | |
680 | x = 0; | |
681 | y++; | |
682 | } | |
683 | } else if (v < NUM_LITERAL_CODES + NUM_LENGTH_CODES) { | |
684 | /* LZ77 backwards mapping */ | |
685 | int prefix_code, length, distance, ref_x, ref_y; | |
686 | ||
687 | /* parse length and distance */ | |
688 | prefix_code = v - NUM_LITERAL_CODES; | |
689 | if (prefix_code < 4) { | |
690 | length = prefix_code + 1; | |
691 | } else { | |
692 | int extra_bits = (prefix_code - 2) >> 1; | |
693 | int offset = 2 + (prefix_code & 1) << extra_bits; | |
694 | length = offset + get_bits(&s->gb, extra_bits) + 1; | |
695 | } | |
696 | prefix_code = huff_reader_get_symbol(&hg[HUFF_IDX_DIST], &s->gb); | |
697 | if (prefix_code < 4) { | |
698 | distance = prefix_code + 1; | |
699 | } else { | |
700 | int extra_bits = prefix_code - 2 >> 1; | |
701 | int offset = 2 + (prefix_code & 1) << extra_bits; | |
702 | distance = offset + get_bits(&s->gb, extra_bits) + 1; | |
703 | } | |
704 | ||
705 | /* find reference location */ | |
706 | if (distance <= NUM_SHORT_DISTANCES) { | |
707 | int xi = lz77_distance_offsets[distance - 1][0]; | |
708 | int yi = lz77_distance_offsets[distance - 1][1]; | |
709 | distance = FFMAX(1, xi + yi * width); | |
710 | } else { | |
711 | distance -= NUM_SHORT_DISTANCES; | |
712 | } | |
713 | ref_x = x; | |
714 | ref_y = y; | |
715 | if (distance <= x) { | |
716 | ref_x -= distance; | |
717 | distance = 0; | |
718 | } else { | |
719 | ref_x = 0; | |
720 | distance -= x; | |
721 | } | |
722 | while (distance >= width) { | |
723 | ref_y--; | |
724 | distance -= width; | |
725 | } | |
726 | if (distance > 0) { | |
727 | ref_x = width - distance; | |
728 | ref_y--; | |
729 | } | |
730 | ref_x = FFMAX(0, ref_x); | |
731 | ref_y = FFMAX(0, ref_y); | |
732 | ||
733 | /* copy pixels | |
734 | * source and dest regions can overlap and wrap lines, so just | |
735 | * copy per-pixel */ | |
736 | for (i = 0; i < length; i++) { | |
737 | uint8_t *p_ref = GET_PIXEL(img->frame, ref_x, ref_y); | |
738 | uint8_t *p = GET_PIXEL(img->frame, x, y); | |
739 | ||
740 | AV_COPY32(p, p_ref); | |
741 | if (img->color_cache_bits) | |
742 | color_cache_put(img, AV_RB32(p)); | |
743 | x++; | |
744 | ref_x++; | |
745 | if (x == width) { | |
746 | x = 0; | |
747 | y++; | |
748 | } | |
749 | if (ref_x == width) { | |
750 | ref_x = 0; | |
751 | ref_y++; | |
752 | } | |
753 | if (y == img->frame->height || ref_y == img->frame->height) | |
754 | break; | |
755 | } | |
756 | } else { | |
757 | /* read from color cache */ | |
758 | uint8_t *p = GET_PIXEL(img->frame, x, y); | |
759 | int cache_idx = v - (NUM_LITERAL_CODES + NUM_LENGTH_CODES); | |
760 | ||
761 | if (!img->color_cache_bits) { | |
762 | av_log(s->avctx, AV_LOG_ERROR, "color cache not found\n"); | |
763 | return AVERROR_INVALIDDATA; | |
764 | } | |
765 | if (cache_idx >= 1 << img->color_cache_bits) { | |
766 | av_log(s->avctx, AV_LOG_ERROR, | |
767 | "color cache index out-of-bounds\n"); | |
768 | return AVERROR_INVALIDDATA; | |
769 | } | |
770 | AV_WB32(p, img->color_cache[cache_idx]); | |
771 | x++; | |
772 | if (x == width) { | |
773 | x = 0; | |
774 | y++; | |
775 | } | |
776 | } | |
777 | } | |
778 | ||
779 | return 0; | |
780 | } | |
781 | ||
782 | /* PRED_MODE_BLACK */ | |
783 | static void inv_predict_0(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
784 | const uint8_t *p_t, const uint8_t *p_tr) | |
785 | { | |
786 | AV_WB32(p, 0xFF000000); | |
787 | } | |
788 | ||
789 | /* PRED_MODE_L */ | |
790 | static void inv_predict_1(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
791 | const uint8_t *p_t, const uint8_t *p_tr) | |
792 | { | |
793 | AV_COPY32(p, p_l); | |
794 | } | |
795 | ||
796 | /* PRED_MODE_T */ | |
797 | static void inv_predict_2(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
798 | const uint8_t *p_t, const uint8_t *p_tr) | |
799 | { | |
800 | AV_COPY32(p, p_t); | |
801 | } | |
802 | ||
803 | /* PRED_MODE_TR */ | |
804 | static void inv_predict_3(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
805 | const uint8_t *p_t, const uint8_t *p_tr) | |
806 | { | |
807 | AV_COPY32(p, p_tr); | |
808 | } | |
809 | ||
810 | /* PRED_MODE_TL */ | |
811 | static void inv_predict_4(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 | AV_COPY32(p, p_tl); | |
815 | } | |
816 | ||
817 | /* PRED_MODE_AVG_T_AVG_L_TR */ | |
818 | static void inv_predict_5(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
819 | const uint8_t *p_t, const uint8_t *p_tr) | |
820 | { | |
821 | p[0] = p_t[0] + (p_l[0] + p_tr[0] >> 1) >> 1; | |
822 | p[1] = p_t[1] + (p_l[1] + p_tr[1] >> 1) >> 1; | |
823 | p[2] = p_t[2] + (p_l[2] + p_tr[2] >> 1) >> 1; | |
824 | p[3] = p_t[3] + (p_l[3] + p_tr[3] >> 1) >> 1; | |
825 | } | |
826 | ||
827 | /* PRED_MODE_AVG_L_TL */ | |
828 | static void inv_predict_6(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
829 | const uint8_t *p_t, const uint8_t *p_tr) | |
830 | { | |
831 | p[0] = p_l[0] + p_tl[0] >> 1; | |
832 | p[1] = p_l[1] + p_tl[1] >> 1; | |
833 | p[2] = p_l[2] + p_tl[2] >> 1; | |
834 | p[3] = p_l[3] + p_tl[3] >> 1; | |
835 | } | |
836 | ||
837 | /* PRED_MODE_AVG_L_T */ | |
838 | static void inv_predict_7(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
839 | const uint8_t *p_t, const uint8_t *p_tr) | |
840 | { | |
841 | p[0] = p_l[0] + p_t[0] >> 1; | |
842 | p[1] = p_l[1] + p_t[1] >> 1; | |
843 | p[2] = p_l[2] + p_t[2] >> 1; | |
844 | p[3] = p_l[3] + p_t[3] >> 1; | |
845 | } | |
846 | ||
847 | /* PRED_MODE_AVG_TL_T */ | |
848 | static void inv_predict_8(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
849 | const uint8_t *p_t, const uint8_t *p_tr) | |
850 | { | |
851 | p[0] = p_tl[0] + p_t[0] >> 1; | |
852 | p[1] = p_tl[1] + p_t[1] >> 1; | |
853 | p[2] = p_tl[2] + p_t[2] >> 1; | |
854 | p[3] = p_tl[3] + p_t[3] >> 1; | |
855 | } | |
856 | ||
857 | /* PRED_MODE_AVG_T_TR */ | |
858 | static void inv_predict_9(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
859 | const uint8_t *p_t, const uint8_t *p_tr) | |
860 | { | |
861 | p[0] = p_t[0] + p_tr[0] >> 1; | |
862 | p[1] = p_t[1] + p_tr[1] >> 1; | |
863 | p[2] = p_t[2] + p_tr[2] >> 1; | |
864 | p[3] = p_t[3] + p_tr[3] >> 1; | |
865 | } | |
866 | ||
867 | /* PRED_MODE_AVG_AVG_L_TL_AVG_T_TR */ | |
868 | static void inv_predict_10(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
869 | const uint8_t *p_t, const uint8_t *p_tr) | |
870 | { | |
871 | p[0] = (p_l[0] + p_tl[0] >> 1) + (p_t[0] + p_tr[0] >> 1) >> 1; | |
872 | p[1] = (p_l[1] + p_tl[1] >> 1) + (p_t[1] + p_tr[1] >> 1) >> 1; | |
873 | p[2] = (p_l[2] + p_tl[2] >> 1) + (p_t[2] + p_tr[2] >> 1) >> 1; | |
874 | p[3] = (p_l[3] + p_tl[3] >> 1) + (p_t[3] + p_tr[3] >> 1) >> 1; | |
875 | } | |
876 | ||
877 | /* PRED_MODE_SELECT */ | |
878 | static void inv_predict_11(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
879 | const uint8_t *p_t, const uint8_t *p_tr) | |
880 | { | |
881 | int diff = (FFABS(p_l[0] - p_tl[0]) - FFABS(p_t[0] - p_tl[0])) + | |
882 | (FFABS(p_l[1] - p_tl[1]) - FFABS(p_t[1] - p_tl[1])) + | |
883 | (FFABS(p_l[2] - p_tl[2]) - FFABS(p_t[2] - p_tl[2])) + | |
884 | (FFABS(p_l[3] - p_tl[3]) - FFABS(p_t[3] - p_tl[3])); | |
885 | if (diff <= 0) | |
886 | AV_COPY32(p, p_t); | |
887 | else | |
888 | AV_COPY32(p, p_l); | |
889 | } | |
890 | ||
891 | /* PRED_MODE_ADD_SUBTRACT_FULL */ | |
892 | static void inv_predict_12(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
893 | const uint8_t *p_t, const uint8_t *p_tr) | |
894 | { | |
895 | p[0] = av_clip_uint8(p_l[0] + p_t[0] - p_tl[0]); | |
896 | p[1] = av_clip_uint8(p_l[1] + p_t[1] - p_tl[1]); | |
897 | p[2] = av_clip_uint8(p_l[2] + p_t[2] - p_tl[2]); | |
898 | p[3] = av_clip_uint8(p_l[3] + p_t[3] - p_tl[3]); | |
899 | } | |
900 | ||
901 | static av_always_inline uint8_t clamp_add_subtract_half(int a, int b, int c) | |
902 | { | |
903 | int d = a + b >> 1; | |
904 | return av_clip_uint8(d + (d - c) / 2); | |
905 | } | |
906 | ||
907 | /* PRED_MODE_ADD_SUBTRACT_HALF */ | |
908 | static void inv_predict_13(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, | |
909 | const uint8_t *p_t, const uint8_t *p_tr) | |
910 | { | |
911 | p[0] = clamp_add_subtract_half(p_l[0], p_t[0], p_tl[0]); | |
912 | p[1] = clamp_add_subtract_half(p_l[1], p_t[1], p_tl[1]); | |
913 | p[2] = clamp_add_subtract_half(p_l[2], p_t[2], p_tl[2]); | |
914 | p[3] = clamp_add_subtract_half(p_l[3], p_t[3], p_tl[3]); | |
915 | } | |
916 | ||
917 | typedef void (*inv_predict_func)(uint8_t *p, const uint8_t *p_l, | |
918 | const uint8_t *p_tl, const uint8_t *p_t, | |
919 | const uint8_t *p_tr); | |
920 | ||
921 | static const inv_predict_func inverse_predict[14] = { | |
922 | inv_predict_0, inv_predict_1, inv_predict_2, inv_predict_3, | |
923 | inv_predict_4, inv_predict_5, inv_predict_6, inv_predict_7, | |
924 | inv_predict_8, inv_predict_9, inv_predict_10, inv_predict_11, | |
925 | inv_predict_12, inv_predict_13, | |
926 | }; | |
927 | ||
928 | static void inverse_prediction(AVFrame *frame, enum PredictionMode m, int x, int y) | |
929 | { | |
930 | uint8_t *dec, *p_l, *p_tl, *p_t, *p_tr; | |
931 | uint8_t p[4]; | |
932 | ||
933 | dec = GET_PIXEL(frame, x, y); | |
934 | p_l = GET_PIXEL(frame, x - 1, y); | |
935 | p_tl = GET_PIXEL(frame, x - 1, y - 1); | |
936 | p_t = GET_PIXEL(frame, x, y - 1); | |
937 | if (x == frame->width - 1) | |
938 | p_tr = GET_PIXEL(frame, 0, y); | |
939 | else | |
940 | p_tr = GET_PIXEL(frame, x + 1, y - 1); | |
941 | ||
942 | inverse_predict[m](p, p_l, p_tl, p_t, p_tr); | |
943 | ||
944 | dec[0] += p[0]; | |
945 | dec[1] += p[1]; | |
946 | dec[2] += p[2]; | |
947 | dec[3] += p[3]; | |
948 | } | |
949 | ||
950 | static int apply_predictor_transform(WebPContext *s) | |
951 | { | |
952 | ImageContext *img = &s->image[IMAGE_ROLE_ARGB]; | |
953 | ImageContext *pimg = &s->image[IMAGE_ROLE_PREDICTOR]; | |
954 | int x, y; | |
955 | ||
956 | for (y = 0; y < img->frame->height; y++) { | |
957 | for (x = 0; x < img->frame->width; x++) { | |
958 | int tx = x >> pimg->size_reduction; | |
959 | int ty = y >> pimg->size_reduction; | |
960 | enum PredictionMode m = GET_PIXEL_COMP(pimg->frame, tx, ty, 2); | |
961 | ||
962 | if (x == 0) { | |
963 | if (y == 0) | |
964 | m = PRED_MODE_BLACK; | |
965 | else | |
966 | m = PRED_MODE_T; | |
967 | } else if (y == 0) | |
968 | m = PRED_MODE_L; | |
969 | ||
970 | if (m > 13) { | |
971 | av_log(s->avctx, AV_LOG_ERROR, | |
972 | "invalid predictor mode: %d\n", m); | |
973 | return AVERROR_INVALIDDATA; | |
974 | } | |
975 | inverse_prediction(img->frame, m, x, y); | |
976 | } | |
977 | } | |
978 | return 0; | |
979 | } | |
980 | ||
981 | static av_always_inline uint8_t color_transform_delta(uint8_t color_pred, | |
982 | uint8_t color) | |
983 | { | |
984 | return (int)ff_u8_to_s8(color_pred) * ff_u8_to_s8(color) >> 5; | |
985 | } | |
986 | ||
987 | static int apply_color_transform(WebPContext *s) | |
988 | { | |
989 | ImageContext *img, *cimg; | |
990 | int x, y, cx, cy; | |
991 | uint8_t *p, *cp; | |
992 | ||
993 | img = &s->image[IMAGE_ROLE_ARGB]; | |
994 | cimg = &s->image[IMAGE_ROLE_COLOR_TRANSFORM]; | |
995 | ||
996 | for (y = 0; y < img->frame->height; y++) { | |
997 | for (x = 0; x < img->frame->width; x++) { | |
998 | cx = x >> cimg->size_reduction; | |
999 | cy = y >> cimg->size_reduction; | |
1000 | cp = GET_PIXEL(cimg->frame, cx, cy); | |
1001 | p = GET_PIXEL(img->frame, x, y); | |
1002 | ||
1003 | p[1] += color_transform_delta(cp[3], p[2]); | |
1004 | p[3] += color_transform_delta(cp[2], p[2]) + | |
1005 | color_transform_delta(cp[1], p[1]); | |
1006 | } | |
1007 | } | |
1008 | return 0; | |
1009 | } | |
1010 | ||
1011 | static int apply_subtract_green_transform(WebPContext *s) | |
1012 | { | |
1013 | int x, y; | |
1014 | ImageContext *img = &s->image[IMAGE_ROLE_ARGB]; | |
1015 | ||
1016 | for (y = 0; y < img->frame->height; y++) { | |
1017 | for (x = 0; x < img->frame->width; x++) { | |
1018 | uint8_t *p = GET_PIXEL(img->frame, x, y); | |
1019 | p[1] += p[2]; | |
1020 | p[3] += p[2]; | |
1021 | } | |
1022 | } | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | static int apply_color_indexing_transform(WebPContext *s) | |
1027 | { | |
1028 | ImageContext *img; | |
1029 | ImageContext *pal; | |
1030 | int i, x, y; | |
1031 | uint8_t *p; | |
1032 | ||
1033 | img = &s->image[IMAGE_ROLE_ARGB]; | |
1034 | pal = &s->image[IMAGE_ROLE_COLOR_INDEXING]; | |
1035 | ||
1036 | if (pal->size_reduction > 0) { | |
1037 | GetBitContext gb_g; | |
1038 | uint8_t *line; | |
1039 | int pixel_bits = 8 >> pal->size_reduction; | |
1040 | ||
1041 | line = av_malloc(img->frame->linesize[0]); | |
1042 | if (!line) | |
1043 | return AVERROR(ENOMEM); | |
1044 | ||
1045 | for (y = 0; y < img->frame->height; y++) { | |
1046 | p = GET_PIXEL(img->frame, 0, y); | |
1047 | memcpy(line, p, img->frame->linesize[0]); | |
1048 | init_get_bits(&gb_g, line, img->frame->linesize[0] * 8); | |
1049 | skip_bits(&gb_g, 16); | |
1050 | i = 0; | |
1051 | for (x = 0; x < img->frame->width; x++) { | |
1052 | p = GET_PIXEL(img->frame, x, y); | |
1053 | p[2] = get_bits(&gb_g, pixel_bits); | |
1054 | i++; | |
1055 | if (i == 1 << pal->size_reduction) { | |
1056 | skip_bits(&gb_g, 24); | |
1057 | i = 0; | |
1058 | } | |
1059 | } | |
1060 | } | |
1061 | av_free(line); | |
1062 | } | |
1063 | ||
f6fa7814 DM |
1064 | // switch to local palette if it's worth initializing it |
1065 | if (img->frame->height * img->frame->width > 300) { | |
1066 | uint8_t palette[256 * 4]; | |
1067 | const int size = pal->frame->width * 4; | |
1068 | av_assert0(size <= 1024U); | |
1069 | memcpy(palette, GET_PIXEL(pal->frame, 0, 0), size); // copy palette | |
1070 | // set extra entries to transparent black | |
1071 | memset(palette + size, 0, 256 * 4 - size); | |
1072 | for (y = 0; y < img->frame->height; y++) { | |
1073 | for (x = 0; x < img->frame->width; x++) { | |
1074 | p = GET_PIXEL(img->frame, x, y); | |
1075 | i = p[2]; | |
1076 | AV_COPY32(p, &palette[i * 4]); | |
1077 | } | |
1078 | } | |
1079 | } else { | |
1080 | for (y = 0; y < img->frame->height; y++) { | |
1081 | for (x = 0; x < img->frame->width; x++) { | |
1082 | p = GET_PIXEL(img->frame, x, y); | |
1083 | i = p[2]; | |
1084 | if (i >= pal->frame->width) { | |
1085 | AV_WB32(p, 0x00000000); | |
1086 | } else { | |
1087 | const uint8_t *pi = GET_PIXEL(pal->frame, i, 0); | |
1088 | AV_COPY32(p, pi); | |
1089 | } | |
2ba45a60 DM |
1090 | } |
1091 | } | |
1092 | } | |
1093 | ||
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | static int vp8_lossless_decode_frame(AVCodecContext *avctx, AVFrame *p, | |
1098 | int *got_frame, uint8_t *data_start, | |
1099 | unsigned int data_size, int is_alpha_chunk) | |
1100 | { | |
1101 | WebPContext *s = avctx->priv_data; | |
1102 | int w, h, ret, i; | |
1103 | ||
1104 | if (!is_alpha_chunk) { | |
1105 | s->lossless = 1; | |
1106 | avctx->pix_fmt = AV_PIX_FMT_ARGB; | |
1107 | } | |
1108 | ||
1109 | ret = init_get_bits(&s->gb, data_start, data_size * 8); | |
1110 | if (ret < 0) | |
1111 | return ret; | |
1112 | ||
1113 | if (!is_alpha_chunk) { | |
1114 | if (get_bits(&s->gb, 8) != 0x2F) { | |
1115 | av_log(avctx, AV_LOG_ERROR, "Invalid WebP Lossless signature\n"); | |
1116 | return AVERROR_INVALIDDATA; | |
1117 | } | |
1118 | ||
1119 | w = get_bits(&s->gb, 14) + 1; | |
1120 | h = get_bits(&s->gb, 14) + 1; | |
1121 | if (s->width && s->width != w) { | |
1122 | av_log(avctx, AV_LOG_WARNING, "Width mismatch. %d != %d\n", | |
1123 | s->width, w); | |
1124 | } | |
1125 | s->width = w; | |
1126 | if (s->height && s->height != h) { | |
1127 | av_log(avctx, AV_LOG_WARNING, "Height mismatch. %d != %d\n", | |
1128 | s->width, w); | |
1129 | } | |
1130 | s->height = h; | |
1131 | ||
1132 | ret = ff_set_dimensions(avctx, s->width, s->height); | |
1133 | if (ret < 0) | |
1134 | return ret; | |
1135 | ||
1136 | s->has_alpha = get_bits1(&s->gb); | |
1137 | ||
1138 | if (get_bits(&s->gb, 3) != 0x0) { | |
1139 | av_log(avctx, AV_LOG_ERROR, "Invalid WebP Lossless version\n"); | |
1140 | return AVERROR_INVALIDDATA; | |
1141 | } | |
1142 | } else { | |
1143 | if (!s->width || !s->height) | |
1144 | return AVERROR_BUG; | |
1145 | w = s->width; | |
1146 | h = s->height; | |
1147 | } | |
1148 | ||
1149 | /* parse transformations */ | |
1150 | s->nb_transforms = 0; | |
1151 | s->reduced_width = 0; | |
1152 | while (get_bits1(&s->gb)) { | |
1153 | enum TransformType transform = get_bits(&s->gb, 2); | |
1154 | s->transforms[s->nb_transforms++] = transform; | |
1155 | switch (transform) { | |
1156 | case PREDICTOR_TRANSFORM: | |
1157 | ret = parse_transform_predictor(s); | |
1158 | break; | |
1159 | case COLOR_TRANSFORM: | |
1160 | ret = parse_transform_color(s); | |
1161 | break; | |
1162 | case COLOR_INDEXING_TRANSFORM: | |
1163 | ret = parse_transform_color_indexing(s); | |
1164 | break; | |
1165 | } | |
1166 | if (ret < 0) | |
1167 | goto free_and_return; | |
1168 | } | |
1169 | ||
1170 | /* decode primary image */ | |
1171 | s->image[IMAGE_ROLE_ARGB].frame = p; | |
1172 | if (is_alpha_chunk) | |
1173 | s->image[IMAGE_ROLE_ARGB].is_alpha_primary = 1; | |
1174 | ret = decode_entropy_coded_image(s, IMAGE_ROLE_ARGB, w, h); | |
1175 | if (ret < 0) | |
1176 | goto free_and_return; | |
1177 | ||
1178 | /* apply transformations */ | |
1179 | for (i = s->nb_transforms - 1; i >= 0; i--) { | |
1180 | switch (s->transforms[i]) { | |
1181 | case PREDICTOR_TRANSFORM: | |
1182 | ret = apply_predictor_transform(s); | |
1183 | break; | |
1184 | case COLOR_TRANSFORM: | |
1185 | ret = apply_color_transform(s); | |
1186 | break; | |
1187 | case SUBTRACT_GREEN: | |
1188 | ret = apply_subtract_green_transform(s); | |
1189 | break; | |
1190 | case COLOR_INDEXING_TRANSFORM: | |
1191 | ret = apply_color_indexing_transform(s); | |
1192 | break; | |
1193 | } | |
1194 | if (ret < 0) | |
1195 | goto free_and_return; | |
1196 | } | |
1197 | ||
1198 | *got_frame = 1; | |
1199 | p->pict_type = AV_PICTURE_TYPE_I; | |
1200 | p->key_frame = 1; | |
1201 | ret = data_size; | |
1202 | ||
1203 | free_and_return: | |
1204 | for (i = 0; i < IMAGE_ROLE_NB; i++) | |
1205 | image_ctx_free(&s->image[i]); | |
1206 | ||
1207 | return ret; | |
1208 | } | |
1209 | ||
1210 | static void alpha_inverse_prediction(AVFrame *frame, enum AlphaFilter m) | |
1211 | { | |
1212 | int x, y, ls; | |
1213 | uint8_t *dec; | |
1214 | ||
1215 | ls = frame->linesize[3]; | |
1216 | ||
1217 | /* filter first row using horizontal filter */ | |
1218 | dec = frame->data[3] + 1; | |
1219 | for (x = 1; x < frame->width; x++, dec++) | |
1220 | *dec += *(dec - 1); | |
1221 | ||
1222 | /* filter first column using vertical filter */ | |
1223 | dec = frame->data[3] + ls; | |
1224 | for (y = 1; y < frame->height; y++, dec += ls) | |
1225 | *dec += *(dec - ls); | |
1226 | ||
1227 | /* filter the rest using the specified filter */ | |
1228 | switch (m) { | |
1229 | case ALPHA_FILTER_HORIZONTAL: | |
1230 | for (y = 1; y < frame->height; y++) { | |
1231 | dec = frame->data[3] + y * ls + 1; | |
1232 | for (x = 1; x < frame->width; x++, dec++) | |
1233 | *dec += *(dec - 1); | |
1234 | } | |
1235 | break; | |
1236 | case ALPHA_FILTER_VERTICAL: | |
1237 | for (y = 1; y < frame->height; y++) { | |
1238 | dec = frame->data[3] + y * ls + 1; | |
1239 | for (x = 1; x < frame->width; x++, dec++) | |
1240 | *dec += *(dec - ls); | |
1241 | } | |
1242 | break; | |
1243 | case ALPHA_FILTER_GRADIENT: | |
1244 | for (y = 1; y < frame->height; y++) { | |
1245 | dec = frame->data[3] + y * ls + 1; | |
1246 | for (x = 1; x < frame->width; x++, dec++) | |
1247 | dec[0] += av_clip_uint8(*(dec - 1) + *(dec - ls) - *(dec - ls - 1)); | |
1248 | } | |
1249 | break; | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | static int vp8_lossy_decode_alpha(AVCodecContext *avctx, AVFrame *p, | |
1254 | uint8_t *data_start, | |
1255 | unsigned int data_size) | |
1256 | { | |
1257 | WebPContext *s = avctx->priv_data; | |
1258 | int x, y, ret; | |
1259 | ||
1260 | if (s->alpha_compression == ALPHA_COMPRESSION_NONE) { | |
1261 | GetByteContext gb; | |
1262 | ||
1263 | bytestream2_init(&gb, data_start, data_size); | |
1264 | for (y = 0; y < s->height; y++) | |
1265 | bytestream2_get_buffer(&gb, p->data[3] + p->linesize[3] * y, | |
1266 | s->width); | |
1267 | } else if (s->alpha_compression == ALPHA_COMPRESSION_VP8L) { | |
1268 | uint8_t *ap, *pp; | |
1269 | int alpha_got_frame = 0; | |
1270 | ||
1271 | s->alpha_frame = av_frame_alloc(); | |
1272 | if (!s->alpha_frame) | |
1273 | return AVERROR(ENOMEM); | |
1274 | ||
1275 | ret = vp8_lossless_decode_frame(avctx, s->alpha_frame, &alpha_got_frame, | |
1276 | data_start, data_size, 1); | |
1277 | if (ret < 0) { | |
1278 | av_frame_free(&s->alpha_frame); | |
1279 | return ret; | |
1280 | } | |
1281 | if (!alpha_got_frame) { | |
1282 | av_frame_free(&s->alpha_frame); | |
1283 | return AVERROR_INVALIDDATA; | |
1284 | } | |
1285 | ||
1286 | /* copy green component of alpha image to alpha plane of primary image */ | |
1287 | for (y = 0; y < s->height; y++) { | |
1288 | ap = GET_PIXEL(s->alpha_frame, 0, y) + 2; | |
1289 | pp = p->data[3] + p->linesize[3] * y; | |
1290 | for (x = 0; x < s->width; x++) { | |
1291 | *pp = *ap; | |
1292 | pp++; | |
1293 | ap += 4; | |
1294 | } | |
1295 | } | |
1296 | av_frame_free(&s->alpha_frame); | |
1297 | } | |
1298 | ||
1299 | /* apply alpha filtering */ | |
1300 | if (s->alpha_filter) | |
1301 | alpha_inverse_prediction(p, s->alpha_filter); | |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | static int vp8_lossy_decode_frame(AVCodecContext *avctx, AVFrame *p, | |
1307 | int *got_frame, uint8_t *data_start, | |
1308 | unsigned int data_size) | |
1309 | { | |
1310 | WebPContext *s = avctx->priv_data; | |
1311 | AVPacket pkt; | |
1312 | int ret; | |
1313 | ||
1314 | if (!s->initialized) { | |
1315 | ff_vp8_decode_init(avctx); | |
1316 | s->initialized = 1; | |
1317 | if (s->has_alpha) | |
1318 | avctx->pix_fmt = AV_PIX_FMT_YUVA420P; | |
1319 | } | |
1320 | s->lossless = 0; | |
1321 | ||
1322 | if (data_size > INT_MAX) { | |
1323 | av_log(avctx, AV_LOG_ERROR, "unsupported chunk size\n"); | |
1324 | return AVERROR_PATCHWELCOME; | |
1325 | } | |
1326 | ||
1327 | av_init_packet(&pkt); | |
1328 | pkt.data = data_start; | |
1329 | pkt.size = data_size; | |
1330 | ||
1331 | ret = ff_vp8_decode_frame(avctx, p, got_frame, &pkt); | |
1332 | if (s->has_alpha) { | |
1333 | ret = vp8_lossy_decode_alpha(avctx, p, s->alpha_data, | |
1334 | s->alpha_data_size); | |
1335 | if (ret < 0) | |
1336 | return ret; | |
1337 | } | |
1338 | return ret; | |
1339 | } | |
1340 | ||
1341 | static int webp_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, | |
1342 | AVPacket *avpkt) | |
1343 | { | |
1344 | AVFrame * const p = data; | |
1345 | WebPContext *s = avctx->priv_data; | |
1346 | GetByteContext gb; | |
1347 | int ret; | |
1348 | uint32_t chunk_type, chunk_size; | |
1349 | int vp8x_flags = 0; | |
1350 | ||
1351 | s->avctx = avctx; | |
1352 | s->width = 0; | |
1353 | s->height = 0; | |
1354 | *got_frame = 0; | |
1355 | s->has_alpha = 0; | |
1356 | s->has_exif = 0; | |
1357 | bytestream2_init(&gb, avpkt->data, avpkt->size); | |
1358 | ||
1359 | if (bytestream2_get_bytes_left(&gb) < 12) | |
1360 | return AVERROR_INVALIDDATA; | |
1361 | ||
1362 | if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) { | |
1363 | av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n"); | |
1364 | return AVERROR_INVALIDDATA; | |
1365 | } | |
1366 | ||
1367 | chunk_size = bytestream2_get_le32(&gb); | |
1368 | if (bytestream2_get_bytes_left(&gb) < chunk_size) | |
1369 | return AVERROR_INVALIDDATA; | |
1370 | ||
1371 | if (bytestream2_get_le32(&gb) != MKTAG('W', 'E', 'B', 'P')) { | |
1372 | av_log(avctx, AV_LOG_ERROR, "missing WEBP tag\n"); | |
1373 | return AVERROR_INVALIDDATA; | |
1374 | } | |
1375 | ||
1376 | av_dict_free(&s->exif_metadata); | |
1377 | while (bytestream2_get_bytes_left(&gb) > 0) { | |
1378 | char chunk_str[5] = { 0 }; | |
1379 | ||
1380 | chunk_type = bytestream2_get_le32(&gb); | |
1381 | chunk_size = bytestream2_get_le32(&gb); | |
1382 | if (chunk_size == UINT32_MAX) | |
1383 | return AVERROR_INVALIDDATA; | |
1384 | chunk_size += chunk_size & 1; | |
1385 | ||
1386 | if (bytestream2_get_bytes_left(&gb) < chunk_size) | |
1387 | return AVERROR_INVALIDDATA; | |
1388 | ||
1389 | switch (chunk_type) { | |
1390 | case MKTAG('V', 'P', '8', ' '): | |
1391 | if (!*got_frame) { | |
1392 | ret = vp8_lossy_decode_frame(avctx, p, got_frame, | |
1393 | avpkt->data + bytestream2_tell(&gb), | |
1394 | chunk_size); | |
1395 | if (ret < 0) | |
1396 | return ret; | |
1397 | } | |
1398 | bytestream2_skip(&gb, chunk_size); | |
1399 | break; | |
1400 | case MKTAG('V', 'P', '8', 'L'): | |
1401 | if (!*got_frame) { | |
1402 | ret = vp8_lossless_decode_frame(avctx, p, got_frame, | |
1403 | avpkt->data + bytestream2_tell(&gb), | |
1404 | chunk_size, 0); | |
1405 | if (ret < 0) | |
1406 | return ret; | |
1407 | } | |
1408 | bytestream2_skip(&gb, chunk_size); | |
1409 | break; | |
1410 | case MKTAG('V', 'P', '8', 'X'): | |
1411 | vp8x_flags = bytestream2_get_byte(&gb); | |
1412 | bytestream2_skip(&gb, 3); | |
1413 | s->width = bytestream2_get_le24(&gb) + 1; | |
1414 | s->height = bytestream2_get_le24(&gb) + 1; | |
1415 | ret = av_image_check_size(s->width, s->height, 0, avctx); | |
1416 | if (ret < 0) | |
1417 | return ret; | |
1418 | break; | |
1419 | case MKTAG('A', 'L', 'P', 'H'): { | |
1420 | int alpha_header, filter_m, compression; | |
1421 | ||
1422 | if (!(vp8x_flags & VP8X_FLAG_ALPHA)) { | |
1423 | av_log(avctx, AV_LOG_WARNING, | |
1424 | "ALPHA chunk present, but alpha bit not set in the " | |
1425 | "VP8X header\n"); | |
1426 | } | |
1427 | if (chunk_size == 0) { | |
1428 | av_log(avctx, AV_LOG_ERROR, "invalid ALPHA chunk size\n"); | |
1429 | return AVERROR_INVALIDDATA; | |
1430 | } | |
1431 | alpha_header = bytestream2_get_byte(&gb); | |
1432 | s->alpha_data = avpkt->data + bytestream2_tell(&gb); | |
1433 | s->alpha_data_size = chunk_size - 1; | |
1434 | bytestream2_skip(&gb, s->alpha_data_size); | |
1435 | ||
1436 | filter_m = (alpha_header >> 2) & 0x03; | |
1437 | compression = alpha_header & 0x03; | |
1438 | ||
1439 | if (compression > ALPHA_COMPRESSION_VP8L) { | |
1440 | av_log(avctx, AV_LOG_VERBOSE, | |
1441 | "skipping unsupported ALPHA chunk\n"); | |
1442 | } else { | |
1443 | s->has_alpha = 1; | |
1444 | s->alpha_compression = compression; | |
1445 | s->alpha_filter = filter_m; | |
1446 | } | |
1447 | ||
1448 | break; | |
1449 | } | |
1450 | case MKTAG('E', 'X', 'I', 'F'): { | |
1451 | int le, ifd_offset, exif_offset = bytestream2_tell(&gb); | |
1452 | GetByteContext exif_gb; | |
1453 | ||
1454 | if (s->has_exif) { | |
1455 | av_log(avctx, AV_LOG_VERBOSE, "Ignoring extra EXIF chunk\n"); | |
1456 | goto exif_end; | |
1457 | } | |
1458 | if (!(vp8x_flags & VP8X_FLAG_EXIF_METADATA)) | |
1459 | av_log(avctx, AV_LOG_WARNING, | |
1460 | "EXIF chunk present, but Exif bit not set in the " | |
1461 | "VP8X header\n"); | |
1462 | ||
1463 | s->has_exif = 1; | |
1464 | bytestream2_init(&exif_gb, avpkt->data + exif_offset, | |
1465 | avpkt->size - exif_offset); | |
1466 | if (ff_tdecode_header(&exif_gb, &le, &ifd_offset) < 0) { | |
1467 | av_log(avctx, AV_LOG_ERROR, "invalid TIFF header " | |
1468 | "in Exif data\n"); | |
1469 | goto exif_end; | |
1470 | } | |
1471 | ||
1472 | bytestream2_seek(&exif_gb, ifd_offset, SEEK_SET); | |
1473 | if (avpriv_exif_decode_ifd(avctx, &exif_gb, le, 0, &s->exif_metadata) < 0) { | |
1474 | av_log(avctx, AV_LOG_ERROR, "error decoding Exif data\n"); | |
1475 | goto exif_end; | |
1476 | } | |
1477 | ||
1478 | av_dict_copy(avpriv_frame_get_metadatap(data), s->exif_metadata, 0); | |
1479 | ||
1480 | exif_end: | |
1481 | av_dict_free(&s->exif_metadata); | |
1482 | bytestream2_skip(&gb, chunk_size); | |
1483 | break; | |
1484 | } | |
1485 | case MKTAG('I', 'C', 'C', 'P'): | |
1486 | case MKTAG('A', 'N', 'I', 'M'): | |
1487 | case MKTAG('A', 'N', 'M', 'F'): | |
1488 | case MKTAG('X', 'M', 'P', ' '): | |
1489 | AV_WL32(chunk_str, chunk_type); | |
1490 | av_log(avctx, AV_LOG_VERBOSE, "skipping unsupported chunk: %s\n", | |
1491 | chunk_str); | |
1492 | bytestream2_skip(&gb, chunk_size); | |
1493 | break; | |
1494 | default: | |
1495 | AV_WL32(chunk_str, chunk_type); | |
1496 | av_log(avctx, AV_LOG_VERBOSE, "skipping unknown chunk: %s\n", | |
1497 | chunk_str); | |
1498 | bytestream2_skip(&gb, chunk_size); | |
1499 | break; | |
1500 | } | |
1501 | } | |
1502 | ||
1503 | if (!*got_frame) { | |
1504 | av_log(avctx, AV_LOG_ERROR, "image data not found\n"); | |
1505 | return AVERROR_INVALIDDATA; | |
1506 | } | |
1507 | ||
1508 | return avpkt->size; | |
1509 | } | |
1510 | ||
1511 | static av_cold int webp_decode_close(AVCodecContext *avctx) | |
1512 | { | |
1513 | WebPContext *s = avctx->priv_data; | |
1514 | ||
1515 | if (s->initialized) | |
1516 | return ff_vp8_decode_free(avctx); | |
1517 | ||
1518 | return 0; | |
1519 | } | |
1520 | ||
1521 | AVCodec ff_webp_decoder = { | |
1522 | .name = "webp", | |
1523 | .long_name = NULL_IF_CONFIG_SMALL("WebP image"), | |
1524 | .type = AVMEDIA_TYPE_VIDEO, | |
1525 | .id = AV_CODEC_ID_WEBP, | |
1526 | .priv_data_size = sizeof(WebPContext), | |
1527 | .decode = webp_decode_frame, | |
1528 | .close = webp_decode_close, | |
1529 | .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, | |
1530 | }; |