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/* |
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* WebP (.webp) image decoder |
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* Copyright (c) 2013 Aneesh Dogra <aneesh@sugarlabs.org> |
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* Copyright (c) 2013 Justin Ruggles <justin.ruggles@gmail.com> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* WebP image decoder |
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* |
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* @author Aneesh Dogra <aneesh@sugarlabs.org> |
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* Container and Lossy decoding |
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* |
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* @author Justin Ruggles <justin.ruggles@gmail.com> |
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* Lossless decoder |
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* Compressed alpha for lossy |
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* |
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* @author James Almer <jamrial@gmail.com> |
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* Exif metadata |
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* ICC profile |
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* |
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* Unimplemented: |
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* - Animation |
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* - XMP metadata |
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*/ |
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#include "libavutil/imgutils.h" |
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#define BITSTREAM_READER_LE |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "exif.h" |
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#include "get_bits.h" |
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#include "internal.h" |
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#include "thread.h" |
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#include "vp8.h" |
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#define VP8X_FLAG_ANIMATION 0x02 |
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#define VP8X_FLAG_XMP_METADATA 0x04 |
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#define VP8X_FLAG_EXIF_METADATA 0x08 |
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#define VP8X_FLAG_ALPHA 0x10 |
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#define VP8X_FLAG_ICC 0x20 |
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#define MAX_PALETTE_SIZE 256 |
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#define MAX_CACHE_BITS 11 |
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#define NUM_CODE_LENGTH_CODES 19 |
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#define HUFFMAN_CODES_PER_META_CODE 5 |
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#define NUM_LITERAL_CODES 256 |
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#define NUM_LENGTH_CODES 24 |
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#define NUM_DISTANCE_CODES 40 |
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#define NUM_SHORT_DISTANCES 120 |
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#define MAX_HUFFMAN_CODE_LENGTH 15 |
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static const uint16_t alphabet_sizes[HUFFMAN_CODES_PER_META_CODE] = { |
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NUM_LITERAL_CODES + NUM_LENGTH_CODES, |
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NUM_LITERAL_CODES, NUM_LITERAL_CODES, NUM_LITERAL_CODES, |
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NUM_DISTANCE_CODES |
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}; |
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static const uint8_t code_length_code_order[NUM_CODE_LENGTH_CODES] = { |
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17, 18, 0, 1, 2, 3, 4, 5, 16, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 |
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}; |
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static const int8_t lz77_distance_offsets[NUM_SHORT_DISTANCES][2] = { |
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{ 0, 1 }, { 1, 0 }, { 1, 1 }, { -1, 1 }, { 0, 2 }, { 2, 0 }, { 1, 2 }, { -1, 2 }, |
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{ 2, 1 }, { -2, 1 }, { 2, 2 }, { -2, 2 }, { 0, 3 }, { 3, 0 }, { 1, 3 }, { -1, 3 }, |
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{ 3, 1 }, { -3, 1 }, { 2, 3 }, { -2, 3 }, { 3, 2 }, { -3, 2 }, { 0, 4 }, { 4, 0 }, |
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{ 1, 4 }, { -1, 4 }, { 4, 1 }, { -4, 1 }, { 3, 3 }, { -3, 3 }, { 2, 4 }, { -2, 4 }, |
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{ 4, 2 }, { -4, 2 }, { 0, 5 }, { 3, 4 }, { -3, 4 }, { 4, 3 }, { -4, 3 }, { 5, 0 }, |
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{ 1, 5 }, { -1, 5 }, { 5, 1 }, { -5, 1 }, { 2, 5 }, { -2, 5 }, { 5, 2 }, { -5, 2 }, |
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{ 4, 4 }, { -4, 4 }, { 3, 5 }, { -3, 5 }, { 5, 3 }, { -5, 3 }, { 0, 6 }, { 6, 0 }, |
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{ 1, 6 }, { -1, 6 }, { 6, 1 }, { -6, 1 }, { 2, 6 }, { -2, 6 }, { 6, 2 }, { -6, 2 }, |
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{ 4, 5 }, { -4, 5 }, { 5, 4 }, { -5, 4 }, { 3, 6 }, { -3, 6 }, { 6, 3 }, { -6, 3 }, |
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{ 0, 7 }, { 7, 0 }, { 1, 7 }, { -1, 7 }, { 5, 5 }, { -5, 5 }, { 7, 1 }, { -7, 1 }, |
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{ 4, 6 }, { -4, 6 }, { 6, 4 }, { -6, 4 }, { 2, 7 }, { -2, 7 }, { 7, 2 }, { -7, 2 }, |
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{ 3, 7 }, { -3, 7 }, { 7, 3 }, { -7, 3 }, { 5, 6 }, { -5, 6 }, { 6, 5 }, { -6, 5 }, |
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{ 8, 0 }, { 4, 7 }, { -4, 7 }, { 7, 4 }, { -7, 4 }, { 8, 1 }, { 8, 2 }, { 6, 6 }, |
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{ -6, 6 }, { 8, 3 }, { 5, 7 }, { -5, 7 }, { 7, 5 }, { -7, 5 }, { 8, 4 }, { 6, 7 }, |
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{ -6, 7 }, { 7, 6 }, { -7, 6 }, { 8, 5 }, { 7, 7 }, { -7, 7 }, { 8, 6 }, { 8, 7 } |
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}; |
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enum AlphaCompression { |
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ALPHA_COMPRESSION_NONE, |
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ALPHA_COMPRESSION_VP8L, |
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}; |
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enum AlphaFilter { |
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ALPHA_FILTER_NONE, |
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ALPHA_FILTER_HORIZONTAL, |
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ALPHA_FILTER_VERTICAL, |
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ALPHA_FILTER_GRADIENT, |
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}; |
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enum TransformType { |
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PREDICTOR_TRANSFORM = 0, |
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COLOR_TRANSFORM = 1, |
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SUBTRACT_GREEN = 2, |
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COLOR_INDEXING_TRANSFORM = 3, |
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}; |
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enum PredictionMode { |
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PRED_MODE_BLACK, |
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PRED_MODE_L, |
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PRED_MODE_T, |
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PRED_MODE_TR, |
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PRED_MODE_TL, |
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PRED_MODE_AVG_T_AVG_L_TR, |
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PRED_MODE_AVG_L_TL, |
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PRED_MODE_AVG_L_T, |
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PRED_MODE_AVG_TL_T, |
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PRED_MODE_AVG_T_TR, |
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PRED_MODE_AVG_AVG_L_TL_AVG_T_TR, |
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PRED_MODE_SELECT, |
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PRED_MODE_ADD_SUBTRACT_FULL, |
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PRED_MODE_ADD_SUBTRACT_HALF, |
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}; |
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enum HuffmanIndex { |
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HUFF_IDX_GREEN = 0, |
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HUFF_IDX_RED = 1, |
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HUFF_IDX_BLUE = 2, |
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HUFF_IDX_ALPHA = 3, |
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HUFF_IDX_DIST = 4 |
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}; |
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/* The structure of WebP lossless is an optional series of transformation data, |
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* followed by the primary image. The primary image also optionally contains |
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* an entropy group mapping if there are multiple entropy groups. There is a |
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* basic image type called an "entropy coded image" that is used for all of |
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* these. The type of each entropy coded image is referred to by the |
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* specification as its role. */ |
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enum ImageRole { |
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/* Primary Image: Stores the actual pixels of the image. */ |
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IMAGE_ROLE_ARGB, |
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/* Entropy Image: Defines which Huffman group to use for different areas of |
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* the primary image. */ |
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IMAGE_ROLE_ENTROPY, |
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/* Predictors: Defines which predictor type to use for different areas of |
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* the primary image. */ |
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IMAGE_ROLE_PREDICTOR, |
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/* Color Transform Data: Defines the color transformation for different |
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* areas of the primary image. */ |
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IMAGE_ROLE_COLOR_TRANSFORM, |
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/* Color Index: Stored as an image of height == 1. */ |
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IMAGE_ROLE_COLOR_INDEXING, |
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IMAGE_ROLE_NB, |
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}; |
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typedef struct HuffReader { |
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VLC vlc; /* Huffman decoder context */ |
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int simple; /* whether to use simple mode */ |
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int nb_symbols; /* number of coded symbols */ |
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uint16_t simple_symbols[2]; /* symbols for simple mode */ |
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} HuffReader; |
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typedef struct ImageContext { |
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enum ImageRole role; /* role of this image */ |
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AVFrame *frame; /* AVFrame for data */ |
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int color_cache_bits; /* color cache size, log2 */ |
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uint32_t *color_cache; /* color cache data */ |
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int nb_huffman_groups; /* number of huffman groups */ |
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HuffReader *huffman_groups; /* reader for each huffman group */ |
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int size_reduction; /* relative size compared to primary image, log2 */ |
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int is_alpha_primary; |
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} ImageContext; |
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typedef struct WebPContext { |
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VP8Context v; /* VP8 Context used for lossy decoding */ |
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GetBitContext gb; /* bitstream reader for main image chunk */ |
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AVFrame *alpha_frame; /* AVFrame for alpha data decompressed from VP8L */ |
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AVCodecContext *avctx; /* parent AVCodecContext */ |
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int initialized; /* set once the VP8 context is initialized */ |
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int has_alpha; /* has a separate alpha chunk */ |
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enum AlphaCompression alpha_compression; /* compression type for alpha chunk */ |
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enum AlphaFilter alpha_filter; /* filtering method for alpha chunk */ |
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uint8_t *alpha_data; /* alpha chunk data */ |
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int alpha_data_size; /* alpha chunk data size */ |
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int has_exif; /* set after an EXIF chunk has been processed */ |
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int has_iccp; /* set after an ICCP chunk has been processed */ |
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int width; /* image width */ |
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int height; /* image height */ |
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int lossless; /* indicates lossless or lossy */ |
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int nb_transforms; /* number of transforms */ |
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enum TransformType transforms[4]; /* transformations used in the image, in order */ |
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int reduced_width; /* reduced width for index image, if applicable */ |
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int nb_huffman_groups; /* number of huffman groups in the primary image */ |
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ImageContext image[IMAGE_ROLE_NB]; /* image context for each role */ |
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} WebPContext; |
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#define GET_PIXEL(frame, x, y) \ |
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((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x)) |
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#define GET_PIXEL_COMP(frame, x, y, c) \ |
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(*((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x) + c)) |
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static void image_ctx_free(ImageContext *img) |
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{ |
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int i, j; |
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av_free(img->color_cache); |
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✓✓✓✗
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if (img->role != IMAGE_ROLE_ARGB && !img->is_alpha_primary) |
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av_frame_free(&img->frame); |
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✓✓ |
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if (img->huffman_groups) { |
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✓✓ |
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for (i = 0; i < img->nb_huffman_groups; i++) { |
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✓✓ |
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for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++) |
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|
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ff_free_vlc(&img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE + j].vlc); |
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} |
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av_free(img->huffman_groups); |
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} |
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memset(img, 0, sizeof(*img)); |
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} |
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235 |
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277908 |
static int huff_reader_get_symbol(HuffReader *r, GetBitContext *gb) |
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{ |
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✓✓ |
277908 |
if (r->simple) { |
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✓✓ |
72022 |
if (r->nb_symbols == 1) |
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71710 |
return r->simple_symbols[0]; |
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else |
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return r->simple_symbols[get_bits1(gb)]; |
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} else |
243 |
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205886 |
return get_vlc2(gb, r->vlc.table, 8, 2); |
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} |
245 |
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246 |
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static int huff_reader_build_canonical(HuffReader *r, const uint8_t *code_lengths, |
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int alphabet_size) |
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{ |
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int len = 0, sym, code = 0, ret; |
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int max_code_length = 0; |
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uint16_t *codes; |
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/* special-case 1 symbol since the vlc reader cannot handle it */ |
254 |
✓✗ |
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for (sym = 0; sym < alphabet_size; sym++) { |
255 |
✓✓ |
706 |
if (code_lengths[sym] > 0) { |
256 |
|
312 |
len++; |
257 |
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code = sym; |
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✓✓ |
312 |
if (len > 1) |
259 |
|
156 |
break; |
260 |
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} |
261 |
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} |
262 |
✗✓ |
156 |
if (len == 1) { |
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r->nb_symbols = 1; |
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r->simple_symbols[0] = code; |
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r->simple = 1; |
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return 0; |
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} |
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269 |
✓✓ |
22470 |
for (sym = 0; sym < alphabet_size; sym++) |
270 |
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22314 |
max_code_length = FFMAX(max_code_length, code_lengths[sym]); |
271 |
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272 |
✓✗✗✓
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156 |
if (max_code_length == 0 || max_code_length > MAX_HUFFMAN_CODE_LENGTH) |
273 |
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return AVERROR(EINVAL); |
274 |
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275 |
|
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codes = av_malloc_array(alphabet_size, sizeof(*codes)); |
276 |
✗✓ |
156 |
if (!codes) |
277 |
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return AVERROR(ENOMEM); |
278 |
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279 |
|
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code = 0; |
280 |
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r->nb_symbols = 0; |
281 |
✓✓ |
1226 |
for (len = 1; len <= max_code_length; len++) { |
282 |
✓✓ |
196630 |
for (sym = 0; sym < alphabet_size; sym++) { |
283 |
✓✓ |
195560 |
if (code_lengths[sym] != len) |
284 |
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188272 |
continue; |
285 |
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7288 |
codes[sym] = code++; |
286 |
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7288 |
r->nb_symbols++; |
287 |
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} |
288 |
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1070 |
code <<= 1; |
289 |
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} |
290 |
✗✓ |
156 |
if (!r->nb_symbols) { |
291 |
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av_free(codes); |
292 |
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return AVERROR_INVALIDDATA; |
293 |
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} |
294 |
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295 |
|
156 |
ret = init_vlc(&r->vlc, 8, alphabet_size, |
296 |
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code_lengths, sizeof(*code_lengths), sizeof(*code_lengths), |
297 |
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codes, sizeof(*codes), sizeof(*codes), INIT_VLC_OUTPUT_LE); |
298 |
✗✓ |
156 |
if (ret < 0) { |
299 |
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av_free(codes); |
300 |
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return ret; |
301 |
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} |
302 |
|
156 |
r->simple = 0; |
303 |
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304 |
|
156 |
av_free(codes); |
305 |
|
156 |
return 0; |
306 |
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} |
307 |
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308 |
|
102 |
static void read_huffman_code_simple(WebPContext *s, HuffReader *hc) |
309 |
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{ |
310 |
|
102 |
hc->nb_symbols = get_bits1(&s->gb) + 1; |
311 |
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|
312 |
✓✓ |
102 |
if (get_bits1(&s->gb)) |
313 |
|
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hc->simple_symbols[0] = get_bits(&s->gb, 8); |
314 |
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else |
315 |
|
88 |
hc->simple_symbols[0] = get_bits1(&s->gb); |
316 |
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|
317 |
✓✓ |
102 |
if (hc->nb_symbols == 2) |
318 |
|
10 |
hc->simple_symbols[1] = get_bits(&s->gb, 8); |
319 |
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320 |
|
102 |
hc->simple = 1; |
321 |
|
102 |
} |
322 |
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323 |
|
78 |
static int read_huffman_code_normal(WebPContext *s, HuffReader *hc, |
324 |
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int alphabet_size) |
325 |
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{ |
326 |
|
78 |
HuffReader code_len_hc = { { 0 }, 0, 0, { 0 } }; |
327 |
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uint8_t *code_lengths; |
328 |
|
78 |
uint8_t code_length_code_lengths[NUM_CODE_LENGTH_CODES] = { 0 }; |
329 |
|
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int i, symbol, max_symbol, prev_code_len, ret; |
330 |
|
78 |
int num_codes = 4 + get_bits(&s->gb, 4); |
331 |
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332 |
|
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av_assert1(num_codes <= NUM_CODE_LENGTH_CODES); |
333 |
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|
334 |
✓✓ |
1154 |
for (i = 0; i < num_codes; i++) |
335 |
|
1076 |
code_length_code_lengths[code_length_code_order[i]] = get_bits(&s->gb, 3); |
336 |
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337 |
|
78 |
ret = huff_reader_build_canonical(&code_len_hc, code_length_code_lengths, |
338 |
|
|
NUM_CODE_LENGTH_CODES); |
339 |
✗✓ |
78 |
if (ret < 0) |
340 |
|
|
return ret; |
341 |
|
|
|
342 |
|
78 |
code_lengths = av_mallocz(alphabet_size); |
343 |
✗✓ |
78 |
if (!code_lengths) { |
344 |
|
|
ret = AVERROR(ENOMEM); |
345 |
|
|
goto finish; |
346 |
|
|
} |
347 |
|
|
|
348 |
✓✓ |
78 |
if (get_bits1(&s->gb)) { |
349 |
|
8 |
int bits = 2 + 2 * get_bits(&s->gb, 3); |
350 |
|
8 |
max_symbol = 2 + get_bits(&s->gb, bits); |
351 |
✗✓ |
8 |
if (max_symbol > alphabet_size) { |
352 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "max symbol %d > alphabet size %d\n", |
353 |
|
|
max_symbol, alphabet_size); |
354 |
|
|
ret = AVERROR_INVALIDDATA; |
355 |
|
|
goto finish; |
356 |
|
|
} |
357 |
|
|
} else { |
358 |
|
70 |
max_symbol = alphabet_size; |
359 |
|
|
} |
360 |
|
|
|
361 |
|
78 |
prev_code_len = 8; |
362 |
|
78 |
symbol = 0; |
363 |
✓✓ |
3222 |
while (symbol < alphabet_size) { |
364 |
|
|
int code_len; |
365 |
|
|
|
366 |
✓✓ |
3152 |
if (!max_symbol--) |
367 |
|
8 |
break; |
368 |
|
3144 |
code_len = huff_reader_get_symbol(&code_len_hc, &s->gb); |
369 |
✓✓ |
3144 |
if (code_len < 16) { |
370 |
|
|
/* Code length code [0..15] indicates literal code lengths. */ |
371 |
|
1880 |
code_lengths[symbol++] = code_len; |
372 |
✓✓ |
1880 |
if (code_len) |
373 |
|
1760 |
prev_code_len = code_len; |
374 |
|
|
} else { |
375 |
|
1264 |
int repeat = 0, length = 0; |
376 |
✓✓✓✗
|
1264 |
switch (code_len) { |
377 |
|
868 |
case 16: |
378 |
|
|
/* Code 16 repeats the previous non-zero value [3..6] times, |
379 |
|
|
* i.e., 3 + ReadBits(2) times. If code 16 is used before a |
380 |
|
|
* non-zero value has been emitted, a value of 8 is repeated. */ |
381 |
|
868 |
repeat = 3 + get_bits(&s->gb, 2); |
382 |
|
868 |
length = prev_code_len; |
383 |
|
868 |
break; |
384 |
|
140 |
case 17: |
385 |
|
|
/* Code 17 emits a streak of zeros [3..10], i.e., |
386 |
|
|
* 3 + ReadBits(3) times. */ |
387 |
|
140 |
repeat = 3 + get_bits(&s->gb, 3); |
388 |
|
140 |
break; |
389 |
|
256 |
case 18: |
390 |
|
|
/* Code 18 emits a streak of zeros of length [11..138], i.e., |
391 |
|
|
* 11 + ReadBits(7) times. */ |
392 |
|
256 |
repeat = 11 + get_bits(&s->gb, 7); |
393 |
|
256 |
break; |
394 |
|
|
} |
395 |
✗✓ |
1264 |
if (symbol + repeat > alphabet_size) { |
396 |
|
|
av_log(s->avctx, AV_LOG_ERROR, |
397 |
|
|
"invalid symbol %d + repeat %d > alphabet size %d\n", |
398 |
|
|
symbol, repeat, alphabet_size); |
399 |
|
|
ret = AVERROR_INVALIDDATA; |
400 |
|
|
goto finish; |
401 |
|
|
} |
402 |
✓✓ |
19354 |
while (repeat-- > 0) |
403 |
|
18090 |
code_lengths[symbol++] = length; |
404 |
|
|
} |
405 |
|
|
} |
406 |
|
|
|
407 |
|
78 |
ret = huff_reader_build_canonical(hc, code_lengths, alphabet_size); |
408 |
|
|
|
409 |
|
78 |
finish: |
410 |
|
78 |
ff_free_vlc(&code_len_hc.vlc); |
411 |
|
78 |
av_free(code_lengths); |
412 |
|
78 |
return ret; |
413 |
|
|
} |
414 |
|
|
|
415 |
|
|
static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role, |
416 |
|
|
int w, int h); |
417 |
|
|
|
418 |
|
|
#define PARSE_BLOCK_SIZE(w, h) do { \ |
419 |
|
|
block_bits = get_bits(&s->gb, 3) + 2; \ |
420 |
|
|
blocks_w = FFALIGN((w), 1 << block_bits) >> block_bits; \ |
421 |
|
|
blocks_h = FFALIGN((h), 1 << block_bits) >> block_bits; \ |
422 |
|
|
} while (0) |
423 |
|
|
|
424 |
|
4 |
static int decode_entropy_image(WebPContext *s) |
425 |
|
|
{ |
426 |
|
|
ImageContext *img; |
427 |
|
|
int ret, block_bits, width, blocks_w, blocks_h, x, y, max; |
428 |
|
|
|
429 |
|
4 |
width = s->width; |
430 |
✗✓ |
4 |
if (s->reduced_width > 0) |
431 |
|
|
width = s->reduced_width; |
432 |
|
|
|
433 |
|
4 |
PARSE_BLOCK_SIZE(width, s->height); |
434 |
|
|
|
435 |
|
4 |
ret = decode_entropy_coded_image(s, IMAGE_ROLE_ENTROPY, blocks_w, blocks_h); |
436 |
✗✓ |
4 |
if (ret < 0) |
437 |
|
|
return ret; |
438 |
|
|
|
439 |
|
4 |
img = &s->image[IMAGE_ROLE_ENTROPY]; |
440 |
|
4 |
img->size_reduction = block_bits; |
441 |
|
|
|
442 |
|
|
/* the number of huffman groups is determined by the maximum group number |
443 |
|
|
* coded in the entropy image */ |
444 |
|
4 |
max = 0; |
445 |
✓✓ |
68 |
for (y = 0; y < img->frame->height; y++) { |
446 |
✓✓ |
1088 |
for (x = 0; x < img->frame->width; x++) { |
447 |
|
1024 |
int p0 = GET_PIXEL_COMP(img->frame, x, y, 1); |
448 |
|
1024 |
int p1 = GET_PIXEL_COMP(img->frame, x, y, 2); |
449 |
|
1024 |
int p = p0 << 8 | p1; |
450 |
|
1024 |
max = FFMAX(max, p); |
451 |
|
|
} |
452 |
|
|
} |
453 |
|
4 |
s->nb_huffman_groups = max + 1; |
454 |
|
|
|
455 |
|
4 |
return 0; |
456 |
|
|
} |
457 |
|
|
|
458 |
|
4 |
static int parse_transform_predictor(WebPContext *s) |
459 |
|
|
{ |
460 |
|
|
int block_bits, blocks_w, blocks_h, ret; |
461 |
|
|
|
462 |
|
4 |
PARSE_BLOCK_SIZE(s->width, s->height); |
463 |
|
|
|
464 |
|
4 |
ret = decode_entropy_coded_image(s, IMAGE_ROLE_PREDICTOR, blocks_w, |
465 |
|
|
blocks_h); |
466 |
✗✓ |
4 |
if (ret < 0) |
467 |
|
|
return ret; |
468 |
|
|
|
469 |
|
4 |
s->image[IMAGE_ROLE_PREDICTOR].size_reduction = block_bits; |
470 |
|
|
|
471 |
|
4 |
return 0; |
472 |
|
|
} |
473 |
|
|
|
474 |
|
4 |
static int parse_transform_color(WebPContext *s) |
475 |
|
|
{ |
476 |
|
|
int block_bits, blocks_w, blocks_h, ret; |
477 |
|
|
|
478 |
|
4 |
PARSE_BLOCK_SIZE(s->width, s->height); |
479 |
|
|
|
480 |
|
4 |
ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_TRANSFORM, blocks_w, |
481 |
|
|
blocks_h); |
482 |
✗✓ |
4 |
if (ret < 0) |
483 |
|
|
return ret; |
484 |
|
|
|
485 |
|
4 |
s->image[IMAGE_ROLE_COLOR_TRANSFORM].size_reduction = block_bits; |
486 |
|
|
|
487 |
|
4 |
return 0; |
488 |
|
|
} |
489 |
|
|
|
490 |
|
6 |
static int parse_transform_color_indexing(WebPContext *s) |
491 |
|
|
{ |
492 |
|
|
ImageContext *img; |
493 |
|
|
int width_bits, index_size, ret, x; |
494 |
|
|
uint8_t *ct; |
495 |
|
|
|
496 |
|
6 |
index_size = get_bits(&s->gb, 8) + 1; |
497 |
|
|
|
498 |
✗✓ |
6 |
if (index_size <= 2) |
499 |
|
|
width_bits = 3; |
500 |
✓✓ |
6 |
else if (index_size <= 4) |
501 |
|
2 |
width_bits = 2; |
502 |
✗✓ |
4 |
else if (index_size <= 16) |
503 |
|
|
width_bits = 1; |
504 |
|
|
else |
505 |
|
4 |
width_bits = 0; |
506 |
|
|
|
507 |
|
6 |
ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_INDEXING, |
508 |
|
|
index_size, 1); |
509 |
✗✓ |
6 |
if (ret < 0) |
510 |
|
|
return ret; |
511 |
|
|
|
512 |
|
6 |
img = &s->image[IMAGE_ROLE_COLOR_INDEXING]; |
513 |
|
6 |
img->size_reduction = width_bits; |
514 |
✓✓ |
6 |
if (width_bits > 0) |
515 |
|
2 |
s->reduced_width = (s->width + ((1 << width_bits) - 1)) >> width_bits; |
516 |
|
|
|
517 |
|
|
/* color index values are delta-coded */ |
518 |
|
6 |
ct = img->frame->data[0] + 4; |
519 |
✓✓ |
1422 |
for (x = 4; x < img->frame->width * 4; x++, ct++) |
520 |
|
1416 |
ct[0] += ct[-4]; |
521 |
|
|
|
522 |
|
6 |
return 0; |
523 |
|
|
} |
524 |
|
|
|
525 |
|
68752 |
static HuffReader *get_huffman_group(WebPContext *s, ImageContext *img, |
526 |
|
|
int x, int y) |
527 |
|
|
{ |
528 |
|
68752 |
ImageContext *gimg = &s->image[IMAGE_ROLE_ENTROPY]; |
529 |
|
68752 |
int group = 0; |
530 |
|
|
|
531 |
✓✓ |
68752 |
if (gimg->size_reduction > 0) { |
532 |
|
65536 |
int group_x = x >> gimg->size_reduction; |
533 |
|
65536 |
int group_y = y >> gimg->size_reduction; |
534 |
|
65536 |
int g0 = GET_PIXEL_COMP(gimg->frame, group_x, group_y, 1); |
535 |
|
65536 |
int g1 = GET_PIXEL_COMP(gimg->frame, group_x, group_y, 2); |
536 |
|
65536 |
group = g0 << 8 | g1; |
537 |
|
|
} |
538 |
|
|
|
539 |
|
68752 |
return &img->huffman_groups[group * HUFFMAN_CODES_PER_META_CODE]; |
540 |
|
|
} |
541 |
|
|
|
542 |
|
|
static av_always_inline void color_cache_put(ImageContext *img, uint32_t c) |
543 |
|
|
{ |
544 |
|
|
uint32_t cache_idx = (0x1E35A7BD * c) >> (32 - img->color_cache_bits); |
545 |
|
|
img->color_cache[cache_idx] = c; |
546 |
|
|
} |
547 |
|
|
|
548 |
|
28 |
static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role, |
549 |
|
|
int w, int h) |
550 |
|
|
{ |
551 |
|
|
ImageContext *img; |
552 |
|
|
HuffReader *hg; |
553 |
|
|
int i, j, ret, x, y, width; |
554 |
|
|
|
555 |
|
28 |
img = &s->image[role]; |
556 |
|
28 |
img->role = role; |
557 |
|
|
|
558 |
✓✓ |
28 |
if (!img->frame) { |
559 |
|
18 |
img->frame = av_frame_alloc(); |
560 |
✗✓ |
18 |
if (!img->frame) |
561 |
|
|
return AVERROR(ENOMEM); |
562 |
|
|
} |
563 |
|
|
|
564 |
|
28 |
img->frame->format = AV_PIX_FMT_ARGB; |
565 |
|
28 |
img->frame->width = w; |
566 |
|
28 |
img->frame->height = h; |
567 |
|
|
|
568 |
✓✓✓✓
|
36 |
if (role == IMAGE_ROLE_ARGB && !img->is_alpha_primary) { |
569 |
|
8 |
ThreadFrame pt = { .f = img->frame }; |
570 |
|
8 |
ret = ff_thread_get_buffer(s->avctx, &pt, 0); |
571 |
|
|
} else |
572 |
|
20 |
ret = av_frame_get_buffer(img->frame, 1); |
573 |
✗✓ |
28 |
if (ret < 0) |
574 |
|
|
return ret; |
575 |
|
|
|
576 |
✗✓ |
28 |
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_mallocz_array(1 << img->color_cache_bits, |
584 |
|
|
sizeof(*img->color_cache)); |
585 |
|
|
if (!img->color_cache) |
586 |
|
|
return AVERROR(ENOMEM); |
587 |
|
|
} else { |
588 |
|
28 |
img->color_cache_bits = 0; |
589 |
|
|
} |
590 |
|
|
|
591 |
|
28 |
img->nb_huffman_groups = 1; |
592 |
✓✓✓✓
|
28 |
if (role == IMAGE_ROLE_ARGB && get_bits1(&s->gb)) { |
593 |
|
4 |
ret = decode_entropy_image(s); |
594 |
✗✓ |
4 |
if (ret < 0) |
595 |
|
|
return ret; |
596 |
|
4 |
img->nb_huffman_groups = s->nb_huffman_groups; |
597 |
|
|
} |
598 |
|
28 |
img->huffman_groups = av_mallocz_array(img->nb_huffman_groups * |
599 |
|
|
HUFFMAN_CODES_PER_META_CODE, |
600 |
|
|
sizeof(*img->huffman_groups)); |
601 |
✗✓ |
28 |
if (!img->huffman_groups) |
602 |
|
|
return AVERROR(ENOMEM); |
603 |
|
|
|
604 |
✓✓ |
64 |
for (i = 0; i < img->nb_huffman_groups; i++) { |
605 |
|
36 |
hg = &img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE]; |
606 |
✓✓ |
216 |
for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++) { |
607 |
|
180 |
int alphabet_size = alphabet_sizes[j]; |
608 |
✓✓✗✓
|
180 |
if (!j && img->color_cache_bits > 0) |
609 |
|
|
alphabet_size += 1 << img->color_cache_bits; |
610 |
|
|
|
611 |
✓✓ |
180 |
if (get_bits1(&s->gb)) { |
612 |
|
102 |
read_huffman_code_simple(s, &hg[j]); |
613 |
|
|
} else { |
614 |
|
78 |
ret = read_huffman_code_normal(s, &hg[j], alphabet_size); |
615 |
✗✓ |
78 |
if (ret < 0) |
616 |
|
|
return ret; |
617 |
|
|
} |
618 |
|
|
} |
619 |
|
|
} |
620 |
|
|
|
621 |
|
28 |
width = img->frame->width; |
622 |
✓✓✓✓
|
28 |
if (role == IMAGE_ROLE_ARGB && s->reduced_width > 0) |
623 |
|
2 |
width = s->reduced_width; |
624 |
|
|
|
625 |
|
28 |
x = 0; y = 0; |
626 |
✓✓ |
68780 |
while (y < img->frame->height) { |
627 |
|
|
int v; |
628 |
|
|
|
629 |
|
68752 |
hg = get_huffman_group(s, img, x, y); |
630 |
|
68752 |
v = huff_reader_get_symbol(&hg[HUFF_IDX_GREEN], &s->gb); |
631 |
✓✓ |
68752 |
if (v < NUM_LITERAL_CODES) { |
632 |
|
|
/* literal pixel values */ |
633 |
|
68630 |
uint8_t *p = GET_PIXEL(img->frame, x, y); |
634 |
|
68630 |
p[2] = v; |
635 |
|
68630 |
p[1] = huff_reader_get_symbol(&hg[HUFF_IDX_RED], &s->gb); |
636 |
|
68630 |
p[3] = huff_reader_get_symbol(&hg[HUFF_IDX_BLUE], &s->gb); |
637 |
|
68630 |
p[0] = huff_reader_get_symbol(&hg[HUFF_IDX_ALPHA], &s->gb); |
638 |
✗✓ |
68630 |
if (img->color_cache_bits) |
639 |
|
|
color_cache_put(img, AV_RB32(p)); |
640 |
|
68630 |
x++; |
641 |
✓✓ |
68630 |
if (x == width) { |
642 |
|
700 |
x = 0; |
643 |
|
700 |
y++; |
644 |
|
|
} |
645 |
✓✗ |
122 |
} else if (v < NUM_LITERAL_CODES + NUM_LENGTH_CODES) { |
646 |
|
|
/* LZ77 backwards mapping */ |
647 |
|
|
int prefix_code, length, distance, ref_x, ref_y; |
648 |
|
|
|
649 |
|
|
/* parse length and distance */ |
650 |
|
122 |
prefix_code = v - NUM_LITERAL_CODES; |
651 |
✓✓ |
122 |
if (prefix_code < 4) { |
652 |
|
48 |
length = prefix_code + 1; |
653 |
|
|
} else { |
654 |
|
74 |
int extra_bits = (prefix_code - 2) >> 1; |
655 |
|
74 |
int offset = 2 + (prefix_code & 1) << extra_bits; |
656 |
|
74 |
length = offset + get_bits(&s->gb, extra_bits) + 1; |
657 |
|
|
} |
658 |
|
122 |
prefix_code = huff_reader_get_symbol(&hg[HUFF_IDX_DIST], &s->gb); |
659 |
✗✓ |
122 |
if (prefix_code > 39U) { |
660 |
|
|
av_log(s->avctx, AV_LOG_ERROR, |
661 |
|
|
"distance prefix code too large: %d\n", prefix_code); |
662 |
|
|
return AVERROR_INVALIDDATA; |
663 |
|
|
} |
664 |
✓✗ |
122 |
if (prefix_code < 4) { |
665 |
|
122 |
distance = prefix_code + 1; |
666 |
|
|
} else { |
667 |
|
|
int extra_bits = prefix_code - 2 >> 1; |
668 |
|
|
int offset = 2 + (prefix_code & 1) << extra_bits; |
669 |
|
|
distance = offset + get_bits(&s->gb, extra_bits) + 1; |
670 |
|
|
} |
671 |
|
|
|
672 |
|
|
/* find reference location */ |
673 |
✓✗ |
122 |
if (distance <= NUM_SHORT_DISTANCES) { |
674 |
|
122 |
int xi = lz77_distance_offsets[distance - 1][0]; |
675 |
|
122 |
int yi = lz77_distance_offsets[distance - 1][1]; |
676 |
|
122 |
distance = FFMAX(1, xi + yi * width); |
677 |
|
|
} else { |
678 |
|
|
distance -= NUM_SHORT_DISTANCES; |
679 |
|
|
} |
680 |
|
122 |
ref_x = x; |
681 |
|
122 |
ref_y = y; |
682 |
✓✓ |
122 |
if (distance <= x) { |
683 |
|
36 |
ref_x -= distance; |
684 |
|
36 |
distance = 0; |
685 |
|
|
} else { |
686 |
|
86 |
ref_x = 0; |
687 |
|
86 |
distance -= x; |
688 |
|
|
} |
689 |
✓✓ |
144 |
while (distance >= width) { |
690 |
|
22 |
ref_y--; |
691 |
|
22 |
distance -= width; |
692 |
|
|
} |
693 |
✓✓ |
122 |
if (distance > 0) { |
694 |
|
64 |
ref_x = width - distance; |
695 |
|
64 |
ref_y--; |
696 |
|
|
} |
697 |
|
122 |
ref_x = FFMAX(0, ref_x); |
698 |
|
122 |
ref_y = FFMAX(0, ref_y); |
699 |
|
|
|
700 |
|
|
/* copy pixels |
701 |
|
|
* source and dest regions can overlap and wrap lines, so just |
702 |
|
|
* copy per-pixel */ |
703 |
✓✓ |
886 |
for (i = 0; i < length; i++) { |
704 |
|
770 |
uint8_t *p_ref = GET_PIXEL(img->frame, ref_x, ref_y); |
705 |
|
770 |
uint8_t *p = GET_PIXEL(img->frame, x, y); |
706 |
|
|
|
707 |
|
770 |
AV_COPY32(p, p_ref); |
708 |
✗✓ |
770 |
if (img->color_cache_bits) |
709 |
|
|
color_cache_put(img, AV_RB32(p)); |
710 |
|
770 |
x++; |
711 |
|
770 |
ref_x++; |
712 |
✓✓ |
770 |
if (x == width) { |
713 |
|
58 |
x = 0; |
714 |
|
58 |
y++; |
715 |
|
|
} |
716 |
✓✓ |
770 |
if (ref_x == width) { |
717 |
|
58 |
ref_x = 0; |
718 |
|
58 |
ref_y++; |
719 |
|
|
} |
720 |
✓✓✓✗
|
770 |
if (y == img->frame->height || ref_y == img->frame->height) |
721 |
|
|
break; |
722 |
|
|
} |
723 |
|
|
} else { |
724 |
|
|
/* read from color cache */ |
725 |
|
|
uint8_t *p = GET_PIXEL(img->frame, x, y); |
726 |
|
|
int cache_idx = v - (NUM_LITERAL_CODES + NUM_LENGTH_CODES); |
727 |
|
|
|
728 |
|
|
if (!img->color_cache_bits) { |
729 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "color cache not found\n"); |
730 |
|
|
return AVERROR_INVALIDDATA; |
731 |
|
|
} |
732 |
|
|
if (cache_idx >= 1 << img->color_cache_bits) { |
733 |
|
|
av_log(s->avctx, AV_LOG_ERROR, |
734 |
|
|
"color cache index out-of-bounds\n"); |
735 |
|
|
return AVERROR_INVALIDDATA; |
736 |
|
|
} |
737 |
|
|
AV_WB32(p, img->color_cache[cache_idx]); |
738 |
|
|
x++; |
739 |
|
|
if (x == width) { |
740 |
|
|
x = 0; |
741 |
|
|
y++; |
742 |
|
|
} |
743 |
|
|
} |
744 |
|
|
} |
745 |
|
|
|
746 |
|
28 |
return 0; |
747 |
|
|
} |
748 |
|
|
|
749 |
|
|
/* PRED_MODE_BLACK */ |
750 |
|
4 |
static void inv_predict_0(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
751 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
752 |
|
|
{ |
753 |
|
4 |
AV_WB32(p, 0xFF000000); |
754 |
|
4 |
} |
755 |
|
|
|
756 |
|
|
/* PRED_MODE_L */ |
757 |
|
5276 |
static void inv_predict_1(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
758 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
759 |
|
|
{ |
760 |
|
5276 |
AV_COPY32(p, p_l); |
761 |
|
5276 |
} |
762 |
|
|
|
763 |
|
|
/* PRED_MODE_T */ |
764 |
|
20764 |
static void inv_predict_2(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
765 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
766 |
|
|
{ |
767 |
|
20764 |
AV_COPY32(p, p_t); |
768 |
|
20764 |
} |
769 |
|
|
|
770 |
|
|
/* PRED_MODE_TR */ |
771 |
|
6336 |
static void inv_predict_3(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
772 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
773 |
|
|
{ |
774 |
|
6336 |
AV_COPY32(p, p_tr); |
775 |
|
6336 |
} |
776 |
|
|
|
777 |
|
|
/* PRED_MODE_TL */ |
778 |
|
1248 |
static void inv_predict_4(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
779 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
780 |
|
|
{ |
781 |
|
1248 |
AV_COPY32(p, p_tl); |
782 |
|
1248 |
} |
783 |
|
|
|
784 |
|
|
/* PRED_MODE_AVG_T_AVG_L_TR */ |
785 |
|
4832 |
static void inv_predict_5(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
786 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
787 |
|
|
{ |
788 |
|
4832 |
p[0] = p_t[0] + (p_l[0] + p_tr[0] >> 1) >> 1; |
789 |
|
4832 |
p[1] = p_t[1] + (p_l[1] + p_tr[1] >> 1) >> 1; |
790 |
|
4832 |
p[2] = p_t[2] + (p_l[2] + p_tr[2] >> 1) >> 1; |
791 |
|
4832 |
p[3] = p_t[3] + (p_l[3] + p_tr[3] >> 1) >> 1; |
792 |
|
4832 |
} |
793 |
|
|
|
794 |
|
|
/* PRED_MODE_AVG_L_TL */ |
795 |
|
768 |
static void inv_predict_6(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
796 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
797 |
|
|
{ |
798 |
|
768 |
p[0] = p_l[0] + p_tl[0] >> 1; |
799 |
|
768 |
p[1] = p_l[1] + p_tl[1] >> 1; |
800 |
|
768 |
p[2] = p_l[2] + p_tl[2] >> 1; |
801 |
|
768 |
p[3] = p_l[3] + p_tl[3] >> 1; |
802 |
|
768 |
} |
803 |
|
|
|
804 |
|
|
/* PRED_MODE_AVG_L_T */ |
805 |
|
3072 |
static void inv_predict_7(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
806 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
807 |
|
|
{ |
808 |
|
3072 |
p[0] = p_l[0] + p_t[0] >> 1; |
809 |
|
3072 |
p[1] = p_l[1] + p_t[1] >> 1; |
810 |
|
3072 |
p[2] = p_l[2] + p_t[2] >> 1; |
811 |
|
3072 |
p[3] = p_l[3] + p_t[3] >> 1; |
812 |
|
3072 |
} |
813 |
|
|
|
814 |
|
|
/* PRED_MODE_AVG_TL_T */ |
815 |
|
4512 |
static void inv_predict_8(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
816 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
817 |
|
|
{ |
818 |
|
4512 |
p[0] = p_tl[0] + p_t[0] >> 1; |
819 |
|
4512 |
p[1] = p_tl[1] + p_t[1] >> 1; |
820 |
|
4512 |
p[2] = p_tl[2] + p_t[2] >> 1; |
821 |
|
4512 |
p[3] = p_tl[3] + p_t[3] >> 1; |
822 |
|
4512 |
} |
823 |
|
|
|
824 |
|
|
/* PRED_MODE_AVG_T_TR */ |
825 |
|
11488 |
static void inv_predict_9(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
826 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
827 |
|
|
{ |
828 |
|
11488 |
p[0] = p_t[0] + p_tr[0] >> 1; |
829 |
|
11488 |
p[1] = p_t[1] + p_tr[1] >> 1; |
830 |
|
11488 |
p[2] = p_t[2] + p_tr[2] >> 1; |
831 |
|
11488 |
p[3] = p_t[3] + p_tr[3] >> 1; |
832 |
|
11488 |
} |
833 |
|
|
|
834 |
|
|
/* PRED_MODE_AVG_AVG_L_TL_AVG_T_TR */ |
835 |
|
3236 |
static void inv_predict_10(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
836 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
837 |
|
|
{ |
838 |
|
3236 |
p[0] = (p_l[0] + p_tl[0] >> 1) + (p_t[0] + p_tr[0] >> 1) >> 1; |
839 |
|
3236 |
p[1] = (p_l[1] + p_tl[1] >> 1) + (p_t[1] + p_tr[1] >> 1) >> 1; |
840 |
|
3236 |
p[2] = (p_l[2] + p_tl[2] >> 1) + (p_t[2] + p_tr[2] >> 1) >> 1; |
841 |
|
3236 |
p[3] = (p_l[3] + p_tl[3] >> 1) + (p_t[3] + p_tr[3] >> 1) >> 1; |
842 |
|
3236 |
} |
843 |
|
|
|
844 |
|
|
/* PRED_MODE_SELECT */ |
845 |
|
3488 |
static void inv_predict_11(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
846 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
847 |
|
|
{ |
848 |
|
3488 |
int diff = (FFABS(p_l[0] - p_tl[0]) - FFABS(p_t[0] - p_tl[0])) + |
849 |
|
3488 |
(FFABS(p_l[1] - p_tl[1]) - FFABS(p_t[1] - p_tl[1])) + |
850 |
|
3488 |
(FFABS(p_l[2] - p_tl[2]) - FFABS(p_t[2] - p_tl[2])) + |
851 |
|
3488 |
(FFABS(p_l[3] - p_tl[3]) - FFABS(p_t[3] - p_tl[3])); |
852 |
✓✓ |
3488 |
if (diff <= 0) |
853 |
|
2296 |
AV_COPY32(p, p_t); |
854 |
|
|
else |
855 |
|
1192 |
AV_COPY32(p, p_l); |
856 |
|
3488 |
} |
857 |
|
|
|
858 |
|
|
/* PRED_MODE_ADD_SUBTRACT_FULL */ |
859 |
|
|
static void inv_predict_12(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
860 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
861 |
|
|
{ |
862 |
|
|
p[0] = av_clip_uint8(p_l[0] + p_t[0] - p_tl[0]); |
863 |
|
|
p[1] = av_clip_uint8(p_l[1] + p_t[1] - p_tl[1]); |
864 |
|
|
p[2] = av_clip_uint8(p_l[2] + p_t[2] - p_tl[2]); |
865 |
|
|
p[3] = av_clip_uint8(p_l[3] + p_t[3] - p_tl[3]); |
866 |
|
|
} |
867 |
|
|
|
868 |
|
2048 |
static av_always_inline uint8_t clamp_add_subtract_half(int a, int b, int c) |
869 |
|
|
{ |
870 |
|
2048 |
int d = a + b >> 1; |
871 |
|
2048 |
return av_clip_uint8(d + (d - c) / 2); |
872 |
|
|
} |
873 |
|
|
|
874 |
|
|
/* PRED_MODE_ADD_SUBTRACT_HALF */ |
875 |
|
512 |
static void inv_predict_13(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, |
876 |
|
|
const uint8_t *p_t, const uint8_t *p_tr) |
877 |
|
|
{ |
878 |
|
512 |
p[0] = clamp_add_subtract_half(p_l[0], p_t[0], p_tl[0]); |
879 |
|
512 |
p[1] = clamp_add_subtract_half(p_l[1], p_t[1], p_tl[1]); |
880 |
|
512 |
p[2] = clamp_add_subtract_half(p_l[2], p_t[2], p_tl[2]); |
881 |
|
512 |
p[3] = clamp_add_subtract_half(p_l[3], p_t[3], p_tl[3]); |
882 |
|
512 |
} |
883 |
|
|
|
884 |
|
|
typedef void (*inv_predict_func)(uint8_t *p, const uint8_t *p_l, |
885 |
|
|
const uint8_t *p_tl, const uint8_t *p_t, |
886 |
|
|
const uint8_t *p_tr); |
887 |
|
|
|
888 |
|
|
static const inv_predict_func inverse_predict[14] = { |
889 |
|
|
inv_predict_0, inv_predict_1, inv_predict_2, inv_predict_3, |
890 |
|
|
inv_predict_4, inv_predict_5, inv_predict_6, inv_predict_7, |
891 |
|
|
inv_predict_8, inv_predict_9, inv_predict_10, inv_predict_11, |
892 |
|
|
inv_predict_12, inv_predict_13, |
893 |
|
|
}; |
894 |
|
|
|
895 |
|
65536 |
static void inverse_prediction(AVFrame *frame, enum PredictionMode m, int x, int y) |
896 |
|
|
{ |
897 |
|
|
uint8_t *dec, *p_l, *p_tl, *p_t, *p_tr; |
898 |
|
|
uint8_t p[4]; |
899 |
|
|
|
900 |
|
65536 |
dec = GET_PIXEL(frame, x, y); |
901 |
|
65536 |
p_l = GET_PIXEL(frame, x - 1, y); |
902 |
|
65536 |
p_tl = GET_PIXEL(frame, x - 1, y - 1); |
903 |
|
65536 |
p_t = GET_PIXEL(frame, x, y - 1); |
904 |
✓✓ |
65536 |
if (x == frame->width - 1) |
905 |
|
512 |
p_tr = GET_PIXEL(frame, 0, y); |
906 |
|
|
else |
907 |
|
65024 |
p_tr = GET_PIXEL(frame, x + 1, y - 1); |
908 |
|
|
|
909 |
|
65536 |
inverse_predict[m](p, p_l, p_tl, p_t, p_tr); |
910 |
|
|
|
911 |
|
65536 |
dec[0] += p[0]; |
912 |
|
65536 |
dec[1] += p[1]; |
913 |
|
65536 |
dec[2] += p[2]; |
914 |
|
65536 |
dec[3] += p[3]; |
915 |
|
65536 |
} |
916 |
|
|
|
917 |
|
4 |
static int apply_predictor_transform(WebPContext *s) |
918 |
|
|
{ |
919 |
|
4 |
ImageContext *img = &s->image[IMAGE_ROLE_ARGB]; |
920 |
|
4 |
ImageContext *pimg = &s->image[IMAGE_ROLE_PREDICTOR]; |
921 |
|
|
int x, y; |
922 |
|
|
|
923 |
✓✓ |
516 |
for (y = 0; y < img->frame->height; y++) { |
924 |
✓✓ |
66048 |
for (x = 0; x < img->frame->width; x++) { |
925 |
|
65536 |
int tx = x >> pimg->size_reduction; |
926 |
|
65536 |
int ty = y >> pimg->size_reduction; |
927 |
|
65536 |
enum PredictionMode m = GET_PIXEL_COMP(pimg->frame, tx, ty, 2); |
928 |
|
|
|
929 |
✓✓ |
65536 |
if (x == 0) { |
930 |
✓✓ |
512 |
if (y == 0) |
931 |
|
4 |
m = PRED_MODE_BLACK; |
932 |
|
|
else |
933 |
|
508 |
m = PRED_MODE_T; |
934 |
✓✓ |
65024 |
} else if (y == 0) |
935 |
|
508 |
m = PRED_MODE_L; |
936 |
|
|
|
937 |
✗✓ |
65536 |
if (m > 13) { |
938 |
|
|
av_log(s->avctx, AV_LOG_ERROR, |
939 |
|
|
"invalid predictor mode: %d\n", m); |
940 |
|
|
return AVERROR_INVALIDDATA; |
941 |
|
|
} |
942 |
|
65536 |
inverse_prediction(img->frame, m, x, y); |
943 |
|
|
} |
944 |
|
|
} |
945 |
|
4 |
return 0; |
946 |
|
|
} |
947 |
|
|
|
948 |
|
196608 |
static av_always_inline uint8_t color_transform_delta(uint8_t color_pred, |
949 |
|
|
uint8_t color) |
950 |
|
|
{ |
951 |
|
196608 |
return (int)ff_u8_to_s8(color_pred) * ff_u8_to_s8(color) >> 5; |
952 |
|
|
} |
953 |
|
|
|
954 |
|
4 |
static int apply_color_transform(WebPContext *s) |
955 |
|
|
{ |
956 |
|
|
ImageContext *img, *cimg; |
957 |
|
|
int x, y, cx, cy; |
958 |
|
|
uint8_t *p, *cp; |
959 |
|
|
|
960 |
|
4 |
img = &s->image[IMAGE_ROLE_ARGB]; |
961 |
|
4 |
cimg = &s->image[IMAGE_ROLE_COLOR_TRANSFORM]; |
962 |
|
|
|
963 |
✓✓ |
516 |
for (y = 0; y < img->frame->height; y++) { |
964 |
✓✓ |
66048 |
for (x = 0; x < img->frame->width; x++) { |
965 |
|
65536 |
cx = x >> cimg->size_reduction; |
966 |
|
65536 |
cy = y >> cimg->size_reduction; |
967 |
|
65536 |
cp = GET_PIXEL(cimg->frame, cx, cy); |
968 |
|
65536 |
p = GET_PIXEL(img->frame, x, y); |
969 |
|
|
|
970 |
|
65536 |
p[1] += color_transform_delta(cp[3], p[2]); |
971 |
|
65536 |
p[3] += color_transform_delta(cp[2], p[2]) + |
972 |
|
65536 |
color_transform_delta(cp[1], p[1]); |
973 |
|
|
} |
974 |
|
|
} |
975 |
|
4 |
return 0; |
976 |
|
|
} |
977 |
|
|
|
978 |
|
4 |
static int apply_subtract_green_transform(WebPContext *s) |
979 |
|
|
{ |
980 |
|
|
int x, y; |
981 |
|
4 |
ImageContext *img = &s->image[IMAGE_ROLE_ARGB]; |
982 |
|
|
|
983 |
✓✓ |
516 |
for (y = 0; y < img->frame->height; y++) { |
984 |
✓✓ |
66048 |
for (x = 0; x < img->frame->width; x++) { |
985 |
|
65536 |
uint8_t *p = GET_PIXEL(img->frame, x, y); |
986 |
|
65536 |
p[1] += p[2]; |
987 |
|
65536 |
p[3] += p[2]; |
988 |
|
|
} |
989 |
|
|
} |
990 |
|
4 |
return 0; |
991 |
|
|
} |
992 |
|
|
|
993 |
|
6 |
static int apply_color_indexing_transform(WebPContext *s) |
994 |
|
|
{ |
995 |
|
|
ImageContext *img; |
996 |
|
|
ImageContext *pal; |
997 |
|
|
int i, x, y; |
998 |
|
|
uint8_t *p; |
999 |
|
|
|
1000 |
|
6 |
img = &s->image[IMAGE_ROLE_ARGB]; |
1001 |
|
6 |
pal = &s->image[IMAGE_ROLE_COLOR_INDEXING]; |
1002 |
|
|
|
1003 |
✓✓ |
6 |
if (pal->size_reduction > 0) { |
1004 |
|
|
GetBitContext gb_g; |
1005 |
|
|
uint8_t *line; |
1006 |
|
2 |
int pixel_bits = 8 >> pal->size_reduction; |
1007 |
|
|
|
1008 |
|
2 |
line = av_malloc(img->frame->linesize[0] + AV_INPUT_BUFFER_PADDING_SIZE); |
1009 |
✗✓ |
2 |
if (!line) |
1010 |
|
|
return AVERROR(ENOMEM); |
1011 |
|
|
|
1012 |
✓✓ |
18 |
for (y = 0; y < img->frame->height; y++) { |
1013 |
|
16 |
p = GET_PIXEL(img->frame, 0, y); |
1014 |
|
16 |
memcpy(line, p, img->frame->linesize[0]); |
1015 |
|
16 |
init_get_bits(&gb_g, line, img->frame->linesize[0] * 8); |
1016 |
|
16 |
skip_bits(&gb_g, 16); |
1017 |
|
16 |
i = 0; |
1018 |
✓✓ |
208 |
for (x = 0; x < img->frame->width; x++) { |
1019 |
|
192 |
p = GET_PIXEL(img->frame, x, y); |
1020 |
|
192 |
p[2] = get_bits(&gb_g, pixel_bits); |
1021 |
|
192 |
i++; |
1022 |
✓✓ |
192 |
if (i == 1 << pal->size_reduction) { |
1023 |
|
48 |
skip_bits(&gb_g, 24); |
1024 |
|
48 |
i = 0; |
1025 |
|
|
} |
1026 |
|
|
} |
1027 |
|
|
} |
1028 |
|
2 |
av_free(line); |
1029 |
|
|
} |
1030 |
|
|
|
1031 |
|
|
// switch to local palette if it's worth initializing it |
1032 |
✗✓ |
6 |
if (img->frame->height * img->frame->width > 300) { |
1033 |
|
|
uint8_t palette[256 * 4]; |
1034 |
|
|
const int size = pal->frame->width * 4; |
1035 |
|
|
av_assert0(size <= 1024U); |
1036 |
|
|
memcpy(palette, GET_PIXEL(pal->frame, 0, 0), size); // copy palette |
1037 |
|
|
// set extra entries to transparent black |
1038 |
|
|
memset(palette + size, 0, 256 * 4 - size); |
1039 |
|
|
for (y = 0; y < img->frame->height; y++) { |
1040 |
|
|
for (x = 0; x < img->frame->width; x++) { |
1041 |
|
|
p = GET_PIXEL(img->frame, x, y); |
1042 |
|
|
i = p[2]; |
1043 |
|
|
AV_COPY32(p, &palette[i * 4]); |
1044 |
|
|
} |
1045 |
|
|
} |
1046 |
|
|
} else { |
1047 |
✓✓ |
54 |
for (y = 0; y < img->frame->height; y++) { |
1048 |
✓✓ |
624 |
for (x = 0; x < img->frame->width; x++) { |
1049 |
|
576 |
p = GET_PIXEL(img->frame, x, y); |
1050 |
|
576 |
i = p[2]; |
1051 |
✗✓ |
576 |
if (i >= pal->frame->width) { |
1052 |
|
|
AV_WB32(p, 0x00000000); |
1053 |
|
|
} else { |
1054 |
|
576 |
const uint8_t *pi = GET_PIXEL(pal->frame, i, 0); |
1055 |
|
576 |
AV_COPY32(p, pi); |
1056 |
|
|
} |
1057 |
|
|
} |
1058 |
|
|
} |
1059 |
|
|
} |
1060 |
|
|
|
1061 |
|
6 |
return 0; |
1062 |
|
|
} |
1063 |
|
|
|
1064 |
|
14 |
static void update_canvas_size(AVCodecContext *avctx, int w, int h) |
1065 |
|
|
{ |
1066 |
|
14 |
WebPContext *s = avctx->priv_data; |
1067 |
✓✓✗✓
|
14 |
if (s->width && s->width != w) { |
1068 |
|
|
av_log(avctx, AV_LOG_WARNING, "Width mismatch. %d != %d\n", |
1069 |
|
|
s->width, w); |
1070 |
|
|
} |
1071 |
|
14 |
s->width = w; |
1072 |
✓✓✗✓
|
14 |
if (s->height && s->height != h) { |
1073 |
|
|
av_log(avctx, AV_LOG_WARNING, "Height mismatch. %d != %d\n", |
1074 |
|
|
s->height, h); |
1075 |
|
|
} |
1076 |
|
14 |
s->height = h; |
1077 |
|
14 |
} |
1078 |
|
|
|
1079 |
|
10 |
static int vp8_lossless_decode_frame(AVCodecContext *avctx, AVFrame *p, |
1080 |
|
|
int *got_frame, uint8_t *data_start, |
1081 |
|
|
unsigned int data_size, int is_alpha_chunk) |
1082 |
|
|
{ |
1083 |
|
10 |
WebPContext *s = avctx->priv_data; |
1084 |
|
|
int w, h, ret, i, used; |
1085 |
|
|
|
1086 |
✓✓ |
10 |
if (!is_alpha_chunk) { |
1087 |
|
8 |
s->lossless = 1; |
1088 |
|
8 |
avctx->pix_fmt = AV_PIX_FMT_ARGB; |
1089 |
|
|
} |
1090 |
|
|
|
1091 |
|
10 |
ret = init_get_bits8(&s->gb, data_start, data_size); |
1092 |
✗✓ |
10 |
if (ret < 0) |
1093 |
|
|
return ret; |
1094 |
|
|
|
1095 |
✓✓ |
10 |
if (!is_alpha_chunk) { |
1096 |
✗✓ |
8 |
if (get_bits(&s->gb, 8) != 0x2F) { |
1097 |
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid WebP Lossless signature\n"); |
1098 |
|
|
return AVERROR_INVALIDDATA; |
1099 |
|
|
} |
1100 |
|
|
|
1101 |
|
8 |
w = get_bits(&s->gb, 14) + 1; |
1102 |
|
8 |
h = get_bits(&s->gb, 14) + 1; |
1103 |
|
|
|
1104 |
|
8 |
update_canvas_size(avctx, w, h); |
1105 |
|
|
|
1106 |
|
8 |
ret = ff_set_dimensions(avctx, s->width, s->height); |
1107 |
✗✓ |
8 |
if (ret < 0) |
1108 |
|
|
return ret; |
1109 |
|
|
|
1110 |
|
8 |
s->has_alpha = get_bits1(&s->gb); |
1111 |
|
|
|
1112 |
✗✓ |
8 |
if (get_bits(&s->gb, 3) != 0x0) { |
1113 |
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid WebP Lossless version\n"); |
1114 |
|
|
return AVERROR_INVALIDDATA; |
1115 |
|
|
} |
1116 |
|
|
} else { |
1117 |
✓✗✗✓
|
2 |
if (!s->width || !s->height) |
1118 |
|
|
return AVERROR_BUG; |
1119 |
|
2 |
w = s->width; |
1120 |
|
2 |
h = s->height; |
1121 |
|
|
} |
1122 |
|
|
|
1123 |
|
|
/* parse transformations */ |
1124 |
|
10 |
s->nb_transforms = 0; |
1125 |
|
10 |
s->reduced_width = 0; |
1126 |
|
10 |
used = 0; |
1127 |
✓✓ |
28 |
while (get_bits1(&s->gb)) { |
1128 |
|
18 |
enum TransformType transform = get_bits(&s->gb, 2); |
1129 |
✗✓ |
18 |
if (used & (1 << transform)) { |
1130 |
|
|
av_log(avctx, AV_LOG_ERROR, "Transform %d used more than once\n", |
1131 |
|
|
transform); |
1132 |
|
|
ret = AVERROR_INVALIDDATA; |
1133 |
|
|
goto free_and_return; |
1134 |
|
|
} |
1135 |
|
18 |
used |= (1 << transform); |
1136 |
|
18 |
s->transforms[s->nb_transforms++] = transform; |
1137 |
✓✓✓✓
|
18 |
switch (transform) { |
1138 |
|
4 |
case PREDICTOR_TRANSFORM: |
1139 |
|
4 |
ret = parse_transform_predictor(s); |
1140 |
|
4 |
break; |
1141 |
|
4 |
case COLOR_TRANSFORM: |
1142 |
|
4 |
ret = parse_transform_color(s); |
1143 |
|
4 |
break; |
1144 |
|
6 |
case COLOR_INDEXING_TRANSFORM: |
1145 |
|
6 |
ret = parse_transform_color_indexing(s); |
1146 |
|
6 |
break; |
1147 |
|
|
} |
1148 |
✗✓ |
18 |
if (ret < 0) |
1149 |
|
|
goto free_and_return; |
1150 |
|
|
} |
1151 |
|
|
|
1152 |
|
|
/* decode primary image */ |
1153 |
|
10 |
s->image[IMAGE_ROLE_ARGB].frame = p; |
1154 |
✓✓ |
10 |
if (is_alpha_chunk) |
1155 |
|
2 |
s->image[IMAGE_ROLE_ARGB].is_alpha_primary = 1; |
1156 |
|
10 |
ret = decode_entropy_coded_image(s, IMAGE_ROLE_ARGB, w, h); |
1157 |
✗✓ |
10 |
if (ret < 0) |
1158 |
|
|
goto free_and_return; |
1159 |
|
|
|
1160 |
|
|
/* apply transformations */ |
1161 |
✓✓ |
28 |
for (i = s->nb_transforms - 1; i >= 0; i--) { |
1162 |
✓✓✓✓ ✗ |
18 |
switch (s->transforms[i]) { |
1163 |
|
4 |
case PREDICTOR_TRANSFORM: |
1164 |
|
4 |
ret = apply_predictor_transform(s); |
1165 |
|
4 |
break; |
1166 |
|
4 |
case COLOR_TRANSFORM: |
1167 |
|
4 |
ret = apply_color_transform(s); |
1168 |
|
4 |
break; |
1169 |
|
4 |
case SUBTRACT_GREEN: |
1170 |
|
4 |
ret = apply_subtract_green_transform(s); |
1171 |
|
4 |
break; |
1172 |
|
6 |
case COLOR_INDEXING_TRANSFORM: |
1173 |
|
6 |
ret = apply_color_indexing_transform(s); |
1174 |
|
6 |
break; |
1175 |
|
|
} |
1176 |
✗✓ |
18 |
if (ret < 0) |
1177 |
|
|
goto free_and_return; |
1178 |
|
|
} |
1179 |
|
|
|
1180 |
|
10 |
*got_frame = 1; |
1181 |
|
10 |
p->pict_type = AV_PICTURE_TYPE_I; |
1182 |
|
10 |
p->key_frame = 1; |
1183 |
|
10 |
ret = data_size; |
1184 |
|
|
|
1185 |
|
10 |
free_and_return: |
1186 |
✓✓ |
60 |
for (i = 0; i < IMAGE_ROLE_NB; i++) |
1187 |
|
50 |
image_ctx_free(&s->image[i]); |
1188 |
|
|
|
1189 |
|
10 |
return ret; |
1190 |
|
|
} |
1191 |
|
|
|
1192 |
|
|
static void alpha_inverse_prediction(AVFrame *frame, enum AlphaFilter m) |
1193 |
|
|
{ |
1194 |
|
|
int x, y, ls; |
1195 |
|
|
uint8_t *dec; |
1196 |
|
|
|
1197 |
|
|
ls = frame->linesize[3]; |
1198 |
|
|
|
1199 |
|
|
/* filter first row using horizontal filter */ |
1200 |
|
|
dec = frame->data[3] + 1; |
1201 |
|
|
for (x = 1; x < frame->width; x++, dec++) |
1202 |
|
|
*dec += *(dec - 1); |
1203 |
|
|
|
1204 |
|
|
/* filter first column using vertical filter */ |
1205 |
|
|
dec = frame->data[3] + ls; |
1206 |
|
|
for (y = 1; y < frame->height; y++, dec += ls) |
1207 |
|
|
*dec += *(dec - ls); |
1208 |
|
|
|
1209 |
|
|
/* filter the rest using the specified filter */ |
1210 |
|
|
switch (m) { |
1211 |
|
|
case ALPHA_FILTER_HORIZONTAL: |
1212 |
|
|
for (y = 1; y < frame->height; y++) { |
1213 |
|
|
dec = frame->data[3] + y * ls + 1; |
1214 |
|
|
for (x = 1; x < frame->width; x++, dec++) |
1215 |
|
|
*dec += *(dec - 1); |
1216 |
|
|
} |
1217 |
|
|
break; |
1218 |
|
|
case ALPHA_FILTER_VERTICAL: |
1219 |
|
|
for (y = 1; y < frame->height; y++) { |
1220 |
|
|
dec = frame->data[3] + y * ls + 1; |
1221 |
|
|
for (x = 1; x < frame->width; x++, dec++) |
1222 |
|
|
*dec += *(dec - ls); |
1223 |
|
|
} |
1224 |
|
|
break; |
1225 |
|
|
case ALPHA_FILTER_GRADIENT: |
1226 |
|
|
for (y = 1; y < frame->height; y++) { |
1227 |
|
|
dec = frame->data[3] + y * ls + 1; |
1228 |
|
|
for (x = 1; x < frame->width; x++, dec++) |
1229 |
|
|
dec[0] += av_clip_uint8(*(dec - 1) + *(dec - ls) - *(dec - ls - 1)); |
1230 |
|
|
} |
1231 |
|
|
break; |
1232 |
|
|
} |
1233 |
|
|
} |
1234 |
|
|
|
1235 |
|
2 |
static int vp8_lossy_decode_alpha(AVCodecContext *avctx, AVFrame *p, |
1236 |
|
|
uint8_t *data_start, |
1237 |
|
|
unsigned int data_size) |
1238 |
|
|
{ |
1239 |
|
2 |
WebPContext *s = avctx->priv_data; |
1240 |
|
|
int x, y, ret; |
1241 |
|
|
|
1242 |
✗✓ |
2 |
if (s->alpha_compression == ALPHA_COMPRESSION_NONE) { |
1243 |
|
|
GetByteContext gb; |
1244 |
|
|
|
1245 |
|
|
bytestream2_init(&gb, data_start, data_size); |
1246 |
|
|
for (y = 0; y < s->height; y++) |
1247 |
|
|
bytestream2_get_buffer(&gb, p->data[3] + p->linesize[3] * y, |
1248 |
|
|
s->width); |
1249 |
✓✗ |
2 |
} else if (s->alpha_compression == ALPHA_COMPRESSION_VP8L) { |
1250 |
|
|
uint8_t *ap, *pp; |
1251 |
|
2 |
int alpha_got_frame = 0; |
1252 |
|
|
|
1253 |
|
2 |
s->alpha_frame = av_frame_alloc(); |
1254 |
✗✓ |
2 |
if (!s->alpha_frame) |
1255 |
|
|
return AVERROR(ENOMEM); |
1256 |
|
|
|
1257 |
|
2 |
ret = vp8_lossless_decode_frame(avctx, s->alpha_frame, &alpha_got_frame, |
1258 |
|
|
data_start, data_size, 1); |
1259 |
✗✓ |
2 |
if (ret < 0) { |
1260 |
|
|
av_frame_free(&s->alpha_frame); |
1261 |
|
|
return ret; |
1262 |
|
|
} |
1263 |
✗✓ |
2 |
if (!alpha_got_frame) { |
1264 |
|
|
av_frame_free(&s->alpha_frame); |
1265 |
|
|
return AVERROR_INVALIDDATA; |
1266 |
|
|
} |
1267 |
|
|
|
1268 |
|
|
/* copy green component of alpha image to alpha plane of primary image */ |
1269 |
✓✓ |
18 |
for (y = 0; y < s->height; y++) { |
1270 |
|
16 |
ap = GET_PIXEL(s->alpha_frame, 0, y) + 2; |
1271 |
|
16 |
pp = p->data[3] + p->linesize[3] * y; |
1272 |
✓✓ |
208 |
for (x = 0; x < s->width; x++) { |
1273 |
|
192 |
*pp = *ap; |
1274 |
|
192 |
pp++; |
1275 |
|
192 |
ap += 4; |
1276 |
|
|
} |
1277 |
|
|
} |
1278 |
|
2 |
av_frame_free(&s->alpha_frame); |
1279 |
|
|
} |
1280 |
|
|
|
1281 |
|
|
/* apply alpha filtering */ |
1282 |
✗✓ |
2 |
if (s->alpha_filter) |
1283 |
|
|
alpha_inverse_prediction(p, s->alpha_filter); |
1284 |
|
|
|
1285 |
|
2 |
return 0; |
1286 |
|
|
} |
1287 |
|
|
|
1288 |
|
6 |
static int vp8_lossy_decode_frame(AVCodecContext *avctx, AVFrame *p, |
1289 |
|
|
int *got_frame, uint8_t *data_start, |
1290 |
|
|
unsigned int data_size) |
1291 |
|
|
{ |
1292 |
|
6 |
WebPContext *s = avctx->priv_data; |
1293 |
|
|
AVPacket pkt; |
1294 |
|
|
int ret; |
1295 |
|
|
|
1296 |
✓✗ |
6 |
if (!s->initialized) { |
1297 |
|
6 |
ff_vp8_decode_init(avctx); |
1298 |
|
6 |
s->initialized = 1; |
1299 |
|
6 |
s->v.actually_webp = 1; |
1300 |
|
|
} |
1301 |
✓✓ |
6 |
avctx->pix_fmt = s->has_alpha ? AV_PIX_FMT_YUVA420P : AV_PIX_FMT_YUV420P; |
1302 |
|
6 |
s->lossless = 0; |
1303 |
|
|
|
1304 |
✗✓ |
6 |
if (data_size > INT_MAX) { |
1305 |
|
|
av_log(avctx, AV_LOG_ERROR, "unsupported chunk size\n"); |
1306 |
|
|
return AVERROR_PATCHWELCOME; |
1307 |
|
|
} |
1308 |
|
|
|
1309 |
|
6 |
av_init_packet(&pkt); |
1310 |
|
6 |
pkt.data = data_start; |
1311 |
|
6 |
pkt.size = data_size; |
1312 |
|
|
|
1313 |
|
6 |
ret = ff_vp8_decode_frame(avctx, p, got_frame, &pkt); |
1314 |
✗✓ |
6 |
if (ret < 0) |
1315 |
|
|
return ret; |
1316 |
|
|
|
1317 |
✗✓ |
6 |
if (!*got_frame) |
1318 |
|
|
return AVERROR_INVALIDDATA; |
1319 |
|
|
|
1320 |
|
6 |
update_canvas_size(avctx, avctx->width, avctx->height); |
1321 |
|
|
|
1322 |
✓✓ |
6 |
if (s->has_alpha) { |
1323 |
|
2 |
ret = vp8_lossy_decode_alpha(avctx, p, s->alpha_data, |
1324 |
|
2 |
s->alpha_data_size); |
1325 |
✗✓ |
2 |
if (ret < 0) |
1326 |
|
|
return ret; |
1327 |
|
|
} |
1328 |
|
6 |
return ret; |
1329 |
|
|
} |
1330 |
|
|
|
1331 |
|
14 |
static int webp_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
1332 |
|
|
AVPacket *avpkt) |
1333 |
|
|
{ |
1334 |
|
14 |
AVFrame * const p = data; |
1335 |
|
14 |
WebPContext *s = avctx->priv_data; |
1336 |
|
|
GetByteContext gb; |
1337 |
|
|
int ret; |
1338 |
|
|
uint32_t chunk_type, chunk_size; |
1339 |
|
14 |
int vp8x_flags = 0; |
1340 |
|
|
|
1341 |
|
14 |
s->avctx = avctx; |
1342 |
|
14 |
s->width = 0; |
1343 |
|
14 |
s->height = 0; |
1344 |
|
14 |
*got_frame = 0; |
1345 |
|
14 |
s->has_alpha = 0; |
1346 |
|
14 |
s->has_exif = 0; |
1347 |
|
14 |
s->has_iccp = 0; |
1348 |
|
14 |
bytestream2_init(&gb, avpkt->data, avpkt->size); |
1349 |
|
|
|
1350 |
✗✓ |
14 |
if (bytestream2_get_bytes_left(&gb) < 12) |
1351 |
|
|
return AVERROR_INVALIDDATA; |
1352 |
|
|
|
1353 |
✗✓ |
14 |
if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) { |
1354 |
|
|
av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n"); |
1355 |
|
|
return AVERROR_INVALIDDATA; |
1356 |
|
|
} |
1357 |
|
|
|
1358 |
|
14 |
chunk_size = bytestream2_get_le32(&gb); |
1359 |
✗✓ |
14 |
if (bytestream2_get_bytes_left(&gb) < chunk_size) |
1360 |
|
|
return AVERROR_INVALIDDATA; |
1361 |
|
|
|
1362 |
✗✓ |
14 |
if (bytestream2_get_le32(&gb) != MKTAG('W', 'E', 'B', 'P')) { |
1363 |
|
|
av_log(avctx, AV_LOG_ERROR, "missing WEBP tag\n"); |
1364 |
|
|
return AVERROR_INVALIDDATA; |
1365 |
|
|
} |
1366 |
|
|
|
1367 |
✓✓ |
36 |
while (bytestream2_get_bytes_left(&gb) > 8) { |
1368 |
|
22 |
char chunk_str[5] = { 0 }; |
1369 |
|
|
|
1370 |
|
22 |
chunk_type = bytestream2_get_le32(&gb); |
1371 |
|
22 |
chunk_size = bytestream2_get_le32(&gb); |
1372 |
✗✓ |
22 |
if (chunk_size == UINT32_MAX) |
1373 |
|
|
return AVERROR_INVALIDDATA; |
1374 |
|
22 |
chunk_size += chunk_size & 1; |
1375 |
|
|
|
1376 |
✗✓ |
22 |
if (bytestream2_get_bytes_left(&gb) < chunk_size) { |
1377 |
|
|
/* we seem to be running out of data, but it could also be that the |
1378 |
|
|
bitstream has trailing junk leading to bogus chunk_size. */ |
1379 |
|
|
break; |
1380 |
|
|
} |
1381 |
|
|
|
1382 |
✓✓✓✓ ✓✗✗✗
|
22 |
switch (chunk_type) { |
1383 |
|
6 |
case MKTAG('V', 'P', '8', ' '): |
1384 |
✓✗ |
6 |
if (!*got_frame) { |
1385 |
|
6 |
ret = vp8_lossy_decode_frame(avctx, p, got_frame, |
1386 |
|
6 |
avpkt->data + bytestream2_tell(&gb), |
1387 |
|
|
chunk_size); |
1388 |
✗✓ |
6 |
if (ret < 0) |
1389 |
|
|
return ret; |
1390 |
|
|
} |
1391 |
|
6 |
bytestream2_skip(&gb, chunk_size); |
1392 |
|
6 |
break; |
1393 |
|
8 |
case MKTAG('V', 'P', '8', 'L'): |
1394 |
✓✗ |
8 |
if (!*got_frame) { |
1395 |
|
8 |
ret = vp8_lossless_decode_frame(avctx, p, got_frame, |
1396 |
|
8 |
avpkt->data + bytestream2_tell(&gb), |
1397 |
|
|
chunk_size, 0); |
1398 |
✗✓ |
8 |
if (ret < 0) |
1399 |
|
|
return ret; |
1400 |
|
8 |
avctx->properties |= FF_CODEC_PROPERTY_LOSSLESS; |
1401 |
|
|
} |
1402 |
|
8 |
bytestream2_skip(&gb, chunk_size); |
1403 |
|
8 |
break; |
1404 |
|
4 |
case MKTAG('V', 'P', '8', 'X'): |
1405 |
✓✗✓✗ ✗✓ |
4 |
if (s->width || s->height || *got_frame) { |
1406 |
|
|
av_log(avctx, AV_LOG_ERROR, "Canvas dimensions are already set\n"); |
1407 |
|
|
return AVERROR_INVALIDDATA; |
1408 |
|
|
} |
1409 |
|
4 |
vp8x_flags = bytestream2_get_byte(&gb); |
1410 |
|
4 |
bytestream2_skip(&gb, 3); |
1411 |
|
4 |
s->width = bytestream2_get_le24(&gb) + 1; |
1412 |
|
4 |
s->height = bytestream2_get_le24(&gb) + 1; |
1413 |
|
4 |
ret = av_image_check_size(s->width, s->height, 0, avctx); |
1414 |
✗✓ |
4 |
if (ret < 0) |
1415 |
|
|
return ret; |
1416 |
|
4 |
break; |
1417 |
|
2 |
case MKTAG('A', 'L', 'P', 'H'): { |
1418 |
|
|
int alpha_header, filter_m, compression; |
1419 |
|
|
|
1420 |
✗✓ |
2 |
if (!(vp8x_flags & VP8X_FLAG_ALPHA)) { |
1421 |
|
|
av_log(avctx, AV_LOG_WARNING, |
1422 |
|
|
"ALPHA chunk present, but alpha bit not set in the " |
1423 |
|
|
"VP8X header\n"); |
1424 |
|
|
} |
1425 |
✗✓ |
2 |
if (chunk_size == 0) { |
1426 |
|
|
av_log(avctx, AV_LOG_ERROR, "invalid ALPHA chunk size\n"); |
1427 |
|
|
return AVERROR_INVALIDDATA; |
1428 |
|
|
} |
1429 |
|
2 |
alpha_header = bytestream2_get_byte(&gb); |
1430 |
|
2 |
s->alpha_data = avpkt->data + bytestream2_tell(&gb); |
1431 |
|
2 |
s->alpha_data_size = chunk_size - 1; |
1432 |
|
2 |
bytestream2_skip(&gb, s->alpha_data_size); |
1433 |
|
|
|
1434 |
|
2 |
filter_m = (alpha_header >> 2) & 0x03; |
1435 |
|
2 |
compression = alpha_header & 0x03; |
1436 |
|
|
|
1437 |
✗✓ |
2 |
if (compression > ALPHA_COMPRESSION_VP8L) { |
1438 |
|
|
av_log(avctx, AV_LOG_VERBOSE, |
1439 |
|
|
"skipping unsupported ALPHA chunk\n"); |
1440 |
|
|
} else { |
1441 |
|
2 |
s->has_alpha = 1; |
1442 |
|
2 |
s->alpha_compression = compression; |
1443 |
|
2 |
s->alpha_filter = filter_m; |
1444 |
|
|
} |
1445 |
|
|
|
1446 |
|
2 |
break; |
1447 |
|
|
} |
1448 |
|
2 |
case MKTAG('E', 'X', 'I', 'F'): { |
1449 |
|
2 |
int le, ifd_offset, exif_offset = bytestream2_tell(&gb); |
1450 |
|
2 |
AVDictionary *exif_metadata = NULL; |
1451 |
|
|
GetByteContext exif_gb; |
1452 |
|
|
|
1453 |
✗✓ |
2 |
if (s->has_exif) { |
1454 |
|
|
av_log(avctx, AV_LOG_VERBOSE, "Ignoring extra EXIF chunk\n"); |
1455 |
|
|
goto exif_end; |
1456 |
|
|
} |
1457 |
✗✓ |
2 |
if (!(vp8x_flags & VP8X_FLAG_EXIF_METADATA)) |
1458 |
|
|
av_log(avctx, AV_LOG_WARNING, |
1459 |
|
|
"EXIF chunk present, but Exif bit not set in the " |
1460 |
|
|
"VP8X header\n"); |
1461 |
|
|
|
1462 |
|
2 |
s->has_exif = 1; |
1463 |
|
2 |
bytestream2_init(&exif_gb, avpkt->data + exif_offset, |
1464 |
|
2 |
avpkt->size - exif_offset); |
1465 |
✗✓ |
2 |
if (ff_tdecode_header(&exif_gb, &le, &ifd_offset) < 0) { |
1466 |
|
|
av_log(avctx, AV_LOG_ERROR, "invalid TIFF header " |
1467 |
|
|
"in Exif data\n"); |
1468 |
|
|
goto exif_end; |
1469 |
|
|
} |
1470 |
|
|
|
1471 |
|
2 |
bytestream2_seek(&exif_gb, ifd_offset, SEEK_SET); |
1472 |
✗✓ |
2 |
if (ff_exif_decode_ifd(avctx, &exif_gb, le, 0, &exif_metadata) < 0) { |
1473 |
|
|
av_log(avctx, AV_LOG_ERROR, "error decoding Exif data\n"); |
1474 |
|
|
goto exif_end; |
1475 |
|
|
} |
1476 |
|
|
|
1477 |
|
2 |
av_dict_copy(&((AVFrame *) data)->metadata, exif_metadata, 0); |
1478 |
|
|
|
1479 |
|
2 |
exif_end: |
1480 |
|
2 |
av_dict_free(&exif_metadata); |
1481 |
|
2 |
bytestream2_skip(&gb, chunk_size); |
1482 |
|
2 |
break; |
1483 |
|
|
} |
1484 |
|
|
case MKTAG('I', 'C', 'C', 'P'): { |
1485 |
|
|
AVFrameSideData *sd; |
1486 |
|
|
|
1487 |
|
|
if (s->has_iccp) { |
1488 |
|
|
av_log(avctx, AV_LOG_VERBOSE, "Ignoring extra ICCP chunk\n"); |
1489 |
|
|
bytestream2_skip(&gb, chunk_size); |
1490 |
|
|
break; |
1491 |
|
|
} |
1492 |
|
|
if (!(vp8x_flags & VP8X_FLAG_ICC)) |
1493 |
|
|
av_log(avctx, AV_LOG_WARNING, |
1494 |
|
|
"ICCP chunk present, but ICC Profile bit not set in the " |
1495 |
|
|
"VP8X header\n"); |
1496 |
|
|
|
1497 |
|
|
s->has_iccp = 1; |
1498 |
|
|
sd = av_frame_new_side_data(p, AV_FRAME_DATA_ICC_PROFILE, chunk_size); |
1499 |
|
|
if (!sd) |
1500 |
|
|
return AVERROR(ENOMEM); |
1501 |
|
|
|
1502 |
|
|
bytestream2_get_buffer(&gb, sd->data, chunk_size); |
1503 |
|
|
break; |
1504 |
|
|
} |
1505 |
|
|
case MKTAG('A', 'N', 'I', 'M'): |
1506 |
|
|
case MKTAG('A', 'N', 'M', 'F'): |
1507 |
|
|
case MKTAG('X', 'M', 'P', ' '): |
1508 |
|
|
AV_WL32(chunk_str, chunk_type); |
1509 |
|
|
av_log(avctx, AV_LOG_WARNING, "skipping unsupported chunk: %s\n", |
1510 |
|
|
chunk_str); |
1511 |
|
|
bytestream2_skip(&gb, chunk_size); |
1512 |
|
|
break; |
1513 |
|
|
default: |
1514 |
|
|
AV_WL32(chunk_str, chunk_type); |
1515 |
|
|
av_log(avctx, AV_LOG_VERBOSE, "skipping unknown chunk: %s\n", |
1516 |
|
|
chunk_str); |
1517 |
|
|
bytestream2_skip(&gb, chunk_size); |
1518 |
|
|
break; |
1519 |
|
|
} |
1520 |
|
|
} |
1521 |
|
|
|
1522 |
✗✓ |
14 |
if (!*got_frame) { |
1523 |
|
|
av_log(avctx, AV_LOG_ERROR, "image data not found\n"); |
1524 |
|
|
return AVERROR_INVALIDDATA; |
1525 |
|
|
} |
1526 |
|
|
|
1527 |
|
14 |
return avpkt->size; |
1528 |
|
|
} |
1529 |
|
|
|
1530 |
|
14 |
static av_cold int webp_decode_close(AVCodecContext *avctx) |
1531 |
|
|
{ |
1532 |
|
14 |
WebPContext *s = avctx->priv_data; |
1533 |
|
|
|
1534 |
✓✓ |
14 |
if (s->initialized) |
1535 |
|
6 |
return ff_vp8_decode_free(avctx); |
1536 |
|
|
|
1537 |
|
8 |
return 0; |
1538 |
|
|
} |
1539 |
|
|
|
1540 |
|
|
AVCodec ff_webp_decoder = { |
1541 |
|
|
.name = "webp", |
1542 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("WebP image"), |
1543 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
1544 |
|
|
.id = AV_CODEC_ID_WEBP, |
1545 |
|
|
.priv_data_size = sizeof(WebPContext), |
1546 |
|
|
.decode = webp_decode_frame, |
1547 |
|
|
.close = webp_decode_close, |
1548 |
|
|
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, |
1549 |
|
|
}; |