webp.c File Reference

#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "exif.h"
#include "get_bits.h"
#include "internal.h"
#include "thread.h"
#include "vp8.h"

Go to the source code of this file.

Data Structures
struct	HuffReader
struct	ImageContext
struct	WebPContext

Macros
#define	BITSTREAM_READER_LE
#define	VP8X_FLAG_ANIMATION   0x02
#define	VP8X_FLAG_XMP_METADATA   0x04
#define	VP8X_FLAG_EXIF_METADATA   0x08
#define	VP8X_FLAG_ALPHA   0x10
#define	VP8X_FLAG_ICC   0x20
#define	MAX_PALETTE_SIZE   256
#define	MAX_CACHE_BITS   11
#define	NUM_CODE_LENGTH_CODES   19
#define	HUFFMAN_CODES_PER_META_CODE   5
#define	NUM_LITERAL_CODES   256
#define	NUM_LENGTH_CODES   24
#define	NUM_DISTANCE_CODES   40
#define	NUM_SHORT_DISTANCES   120
#define	MAX_HUFFMAN_CODE_LENGTH   15
#define	GET_PIXEL(frame, x, y)   ((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x))
#define	GET_PIXEL_COMP(frame, x, y, c)   (*((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x) + c))
#define	PARSE_BLOCK_SIZE(w, h)

Typedefs
typedef void(*	inv_predict_func) (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)

Enumerations
enum	AlphaCompression { ALPHA_COMPRESSION_NONE, ALPHA_COMPRESSION_VP8L }
enum	AlphaFilter { ALPHA_FILTER_NONE, ALPHA_FILTER_HORIZONTAL, ALPHA_FILTER_VERTICAL, ALPHA_FILTER_GRADIENT }
enum	TransformType {   PREDICTOR_TRANSFORM = 0, COLOR_TRANSFORM = 1, SUBTRACT_GREEN = 2, COLOR_INDEXING_TRANSFORM = 3,   DI, DII, TDII, LATT,   NB_TTYPE }
enum	PredictionMode {   PRED_MODE_BLACK, PRED_MODE_L, PRED_MODE_T, PRED_MODE_TR,   PRED_MODE_TL, PRED_MODE_AVG_T_AVG_L_TR, PRED_MODE_AVG_L_TL, PRED_MODE_AVG_L_T,   PRED_MODE_AVG_TL_T, PRED_MODE_AVG_T_TR, PRED_MODE_AVG_AVG_L_TL_AVG_T_TR, PRED_MODE_SELECT,   PRED_MODE_ADD_SUBTRACT_FULL, PRED_MODE_ADD_SUBTRACT_HALF }
enum	HuffmanIndex {   HUFF_IDX_GREEN = 0, HUFF_IDX_RED = 1, HUFF_IDX_BLUE = 2, HUFF_IDX_ALPHA = 3,   HUFF_IDX_DIST = 4 }
enum	ImageRole {   IMAGE_ROLE_ARGB, IMAGE_ROLE_ENTROPY, IMAGE_ROLE_PREDICTOR, IMAGE_ROLE_COLOR_TRANSFORM,   IMAGE_ROLE_COLOR_INDEXING, IMAGE_ROLE_NB }

Functions
static void	image_ctx_free (ImageContext *img)
static int	huff_reader_get_symbol (HuffReader *r, GetBitContext *gb)
static int	huff_reader_build_canonical (HuffReader *r, const uint8_t *code_lengths, int alphabet_size)
static void	read_huffman_code_simple (WebPContext *s, HuffReader *hc)
static int	read_huffman_code_normal (WebPContext *s, HuffReader *hc, int alphabet_size)
static int	decode_entropy_coded_image (WebPContext *s, enum ImageRole role, int w, int h)
static int	decode_entropy_image (WebPContext *s)
static int	parse_transform_predictor (WebPContext *s)
static int	parse_transform_color (WebPContext *s)
static int	parse_transform_color_indexing (WebPContext *s)
static HuffReader *	get_huffman_group (WebPContext *s, ImageContext *img, int x, int y)
static av_always_inline void	color_cache_put (ImageContext *img, uint32_t c)
static void	inv_predict_0 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_1 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_2 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_3 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_4 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_5 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_6 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_7 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_8 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_9 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_10 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_11 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inv_predict_12 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static av_always_inline uint8_t	clamp_add_subtract_half (int a, int b, int c)
static void	inv_predict_13 (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)
static void	inverse_prediction (AVFrame *frame, enum PredictionMode m, int x, int y)
static int	apply_predictor_transform (WebPContext *s)
static av_always_inline uint8_t	color_transform_delta (uint8_t color_pred, uint8_t color)
static int	apply_color_transform (WebPContext *s)
static int	apply_subtract_green_transform (WebPContext *s)
static int	apply_color_indexing_transform (WebPContext *s)
static void	update_canvas_size (AVCodecContext *avctx, int w, int h)
static int	vp8_lossless_decode_frame (AVCodecContext *avctx, AVFrame *p, int *got_frame, uint8_t *data_start, unsigned int data_size, int is_alpha_chunk)
static void	alpha_inverse_prediction (AVFrame *frame, enum AlphaFilter m)
static int	vp8_lossy_decode_alpha (AVCodecContext *avctx, AVFrame *p, uint8_t *data_start, unsigned int data_size)
static int	vp8_lossy_decode_frame (AVCodecContext *avctx, AVFrame *p, int *got_frame, uint8_t *data_start, unsigned int data_size)
static int	webp_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static av_cold int	webp_decode_init (AVCodecContext *avctx)
static av_cold int	webp_decode_close (AVCodecContext *avctx)

Variables
static const uint16_t	alphabet_sizes [HUFFMAN_CODES_PER_META_CODE]
static const uint8_t	code_length_code_order [NUM_CODE_LENGTH_CODES]
static const int8_t	lz77_distance_offsets [NUM_SHORT_DISTANCES][2]
static const inv_predict_func	inverse_predict [14]
AVCodec	ff_webp_decoder

Detailed Description

WebP image decoder

Author

Aneesh Dogra anees.nosp@m.h@su.nosp@m.garla.nosp@m.bs.o.nosp@m.rg Container and Lossy decoding

Justin Ruggles justi.nosp@m.n.ru.nosp@m.ggles.nosp@m.@gma.nosp@m.il.co.nosp@m.m Lossless decoder Compressed alpha for lossy

James Almer jamri.nosp@m.al@g.nosp@m.mail..nosp@m.com Exif metadata ICC profile

Unimplemented:

• Animation
• XMP metadata

Definition in file webp.c.

Macro Definition Documentation

BITSTREAM_READER_LE

#define BITSTREAM_READER_LE

Definition at line 45 of file webp.c.

VP8X_FLAG_ANIMATION

#define VP8X_FLAG_ANIMATION   0x02

Definition at line 54 of file webp.c.

VP8X_FLAG_XMP_METADATA

#define VP8X_FLAG_XMP_METADATA   0x04

Definition at line 55 of file webp.c.

VP8X_FLAG_EXIF_METADATA

#define VP8X_FLAG_EXIF_METADATA   0x08

Definition at line 56 of file webp.c.

VP8X_FLAG_ALPHA

#define VP8X_FLAG_ALPHA   0x10

Definition at line 57 of file webp.c.

VP8X_FLAG_ICC

#define VP8X_FLAG_ICC   0x20

Definition at line 58 of file webp.c.

MAX_PALETTE_SIZE

#define MAX_PALETTE_SIZE   256

Definition at line 60 of file webp.c.

MAX_CACHE_BITS

#define MAX_CACHE_BITS   11

Definition at line 61 of file webp.c.

NUM_CODE_LENGTH_CODES

#define NUM_CODE_LENGTH_CODES   19

Definition at line 62 of file webp.c.

HUFFMAN_CODES_PER_META_CODE

#define HUFFMAN_CODES_PER_META_CODE   5

Definition at line 63 of file webp.c.

NUM_LITERAL_CODES

#define NUM_LITERAL_CODES   256

Definition at line 64 of file webp.c.

NUM_LENGTH_CODES

#define NUM_LENGTH_CODES   24

Definition at line 65 of file webp.c.

NUM_DISTANCE_CODES

#define NUM_DISTANCE_CODES   40

Definition at line 66 of file webp.c.

NUM_SHORT_DISTANCES

#define NUM_SHORT_DISTANCES   120

Definition at line 67 of file webp.c.

MAX_HUFFMAN_CODE_LENGTH

#define MAX_HUFFMAN_CODE_LENGTH   15

Definition at line 68 of file webp.c.

GET_PIXEL

#define GET_PIXEL	(		frame,
			x,
			y
	)		((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x))

Definition at line 213 of file webp.c.

GET_PIXEL_COMP

#define GET_PIXEL_COMP	(		frame,
			x,
			y,
			c
	)		(*((frame)->data[0] + (y) * frame->linesize[0] + 4 * (x) + c))

Definition at line 216 of file webp.c.

PARSE_BLOCK_SIZE

#define PARSE_BLOCK_SIZE	(		w,
			h
	)

Value:

    do {                                         \
    block_bits = get_bits(&s->gb, 3) + 2;                                   \
    blocks_w   = FFALIGN((w), 1 << block_bits) >> block_bits;               \
    blocks_h   = FFALIGN((h), 1 << block_bits) >> block_bits;               \
} while (0)

Definition at line 419 of file webp.c.

Typedef Documentation

inv_predict_func

typedef void(* inv_predict_func) (uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl, const uint8_t *p_t, const uint8_t *p_tr)

Definition at line 888 of file webp.c.

Enumeration Type Documentation

AlphaCompression

enum AlphaCompression

Enumerator
ALPHA_COMPRESSION_NONE
ALPHA_COMPRESSION_VP8L

Definition at line 98 of file webp.c.

AlphaFilter

enum AlphaFilter

Enumerator
ALPHA_FILTER_NONE
ALPHA_FILTER_HORIZONTAL
ALPHA_FILTER_VERTICAL
ALPHA_FILTER_GRADIENT

Definition at line 103 of file webp.c.

TransformType

enum TransformType

Enumerator
PREDICTOR_TRANSFORM
COLOR_TRANSFORM
SUBTRACT_GREEN
COLOR_INDEXING_TRANSFORM
DI
DII
TDII
LATT
NB_TTYPE

Definition at line 110 of file webp.c.

PredictionMode

enum PredictionMode

Enumerator
PRED_MODE_BLACK
PRED_MODE_L
PRED_MODE_T
PRED_MODE_TR
PRED_MODE_TL
PRED_MODE_AVG_T_AVG_L_TR
PRED_MODE_AVG_L_TL
PRED_MODE_AVG_L_T
PRED_MODE_AVG_TL_T
PRED_MODE_AVG_T_TR
PRED_MODE_AVG_AVG_L_TL_AVG_T_TR
PRED_MODE_SELECT
PRED_MODE_ADD_SUBTRACT_FULL
PRED_MODE_ADD_SUBTRACT_HALF

Definition at line 117 of file webp.c.

HuffmanIndex

enum HuffmanIndex

Enumerator
HUFF_IDX_GREEN
HUFF_IDX_RED
HUFF_IDX_BLUE
HUFF_IDX_ALPHA
HUFF_IDX_DIST

Definition at line 134 of file webp.c.

ImageRole

enum ImageRole

Enumerator
IMAGE_ROLE_ARGB
IMAGE_ROLE_ENTROPY
IMAGE_ROLE_PREDICTOR
IMAGE_ROLE_COLOR_TRANSFORM
IMAGE_ROLE_COLOR_INDEXING
IMAGE_ROLE_NB

Definition at line 148 of file webp.c.

Function Documentation

image_ctx_free()

static void image_ctx_free ( ImageContext *  img )

static

Definition at line 219 of file webp.c.

Referenced by vp8_lossless_decode_frame().

huff_reader_get_symbol()

static int huff_reader_get_symbol ( HuffReader *  r, GetBitContext *  gb  )

static

Definition at line 236 of file webp.c.

Referenced by decode_entropy_coded_image(), and read_huffman_code_normal().

huff_reader_build_canonical()

static int huff_reader_build_canonical ( HuffReader *  r, const uint8_t *  code_lengths, int  alphabet_size  )

static

Definition at line 247 of file webp.c.

Referenced by read_huffman_code_normal().

read_huffman_code_simple()

static void read_huffman_code_simple ( WebPContext *  s, HuffReader *  hc  )

static

Definition at line 309 of file webp.c.

Referenced by decode_entropy_coded_image().

read_huffman_code_normal()

static int read_huffman_code_normal ( WebPContext *  s, HuffReader *  hc, int  alphabet_size  )

static

Definition at line 324 of file webp.c.

Referenced by decode_entropy_coded_image().

decode_entropy_coded_image()

static int decode_entropy_coded_image ( WebPContext *  s, enum ImageRole  role, int  w, int  h  )

static

Definition at line 549 of file webp.c.

Referenced by decode_entropy_image(), parse_transform_color(), parse_transform_color_indexing(), parse_transform_predictor(), and vp8_lossless_decode_frame().

decode_entropy_image()

static int decode_entropy_image ( WebPContext *  s )

static

Definition at line 425 of file webp.c.

Referenced by decode_entropy_coded_image().

parse_transform_predictor()

static int parse_transform_predictor ( WebPContext *  s )

static

Definition at line 459 of file webp.c.

Referenced by vp8_lossless_decode_frame().

parse_transform_color()

static int parse_transform_color ( WebPContext *  s )

static

Definition at line 475 of file webp.c.

Referenced by vp8_lossless_decode_frame().

parse_transform_color_indexing()

static int parse_transform_color_indexing ( WebPContext *  s )

static

Definition at line 491 of file webp.c.

Referenced by vp8_lossless_decode_frame().

get_huffman_group()

static HuffReader* get_huffman_group ( WebPContext *  s, ImageContext *  img, int  x, int  y  )

static

Definition at line 526 of file webp.c.

Referenced by decode_entropy_coded_image().

color_cache_put()

static av_always_inline void color_cache_put ( ImageContext *  img, uint32_t  c  )

static

Definition at line 543 of file webp.c.

Referenced by decode_entropy_coded_image().

inv_predict_0()

static void inv_predict_0 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 754 of file webp.c.

inv_predict_1()

static void inv_predict_1 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 761 of file webp.c.

inv_predict_2()

static void inv_predict_2 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 768 of file webp.c.

inv_predict_3()

static void inv_predict_3 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 775 of file webp.c.

inv_predict_4()

static void inv_predict_4 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 782 of file webp.c.

inv_predict_5()

static void inv_predict_5 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 789 of file webp.c.

inv_predict_6()

static void inv_predict_6 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 799 of file webp.c.

inv_predict_7()

static void inv_predict_7 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 809 of file webp.c.

inv_predict_8()

static void inv_predict_8 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 819 of file webp.c.

inv_predict_9()

static void inv_predict_9 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 829 of file webp.c.

inv_predict_10()

static void inv_predict_10 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 839 of file webp.c.

inv_predict_11()

static void inv_predict_11 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 849 of file webp.c.

inv_predict_12()

static void inv_predict_12 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 863 of file webp.c.

clamp_add_subtract_half()

static av_always_inline uint8_t clamp_add_subtract_half ( int  a, int  b, int  c  )

static

Definition at line 872 of file webp.c.

Referenced by inv_predict_13().

inv_predict_13()

static void inv_predict_13 ( uint8_t *  p, const uint8_t *  p_l, const uint8_t *  p_tl, const uint8_t *  p_t, const uint8_t *  p_tr  )

static

Definition at line 879 of file webp.c.

inverse_prediction()

static void inverse_prediction ( AVFrame *  frame, enum PredictionMode  m, int  x, int  y  )

static

Definition at line 899 of file webp.c.

Referenced by apply_predictor_transform().

apply_predictor_transform()

static int apply_predictor_transform ( WebPContext *  s )

static

Definition at line 921 of file webp.c.

Referenced by vp8_lossless_decode_frame().

color_transform_delta()

static av_always_inline uint8_t color_transform_delta ( uint8_t  color_pred, uint8_t  color  )

static

Definition at line 952 of file webp.c.

Referenced by apply_color_transform().

apply_color_transform()

static int apply_color_transform ( WebPContext *  s )

static

Definition at line 958 of file webp.c.

Referenced by vp8_lossless_decode_frame().

apply_subtract_green_transform()

static int apply_subtract_green_transform ( WebPContext *  s )

static

Definition at line 982 of file webp.c.

Referenced by vp8_lossless_decode_frame().

apply_color_indexing_transform()

static int apply_color_indexing_transform ( WebPContext *  s )

static

Definition at line 997 of file webp.c.

Referenced by vp8_lossless_decode_frame().

update_canvas_size()

static void update_canvas_size ( AVCodecContext *  avctx, int  w, int  h  )

static

Definition at line 1068 of file webp.c.

Referenced by vp8_lossless_decode_frame(), and vp8_lossy_decode_frame().

vp8_lossless_decode_frame()

static int vp8_lossless_decode_frame ( AVCodecContext *  avctx, AVFrame *  p, int *  got_frame, uint8_t *  data_start, unsigned int  data_size, int  is_alpha_chunk  )

static

Definition at line 1083 of file webp.c.

Referenced by vp8_lossy_decode_alpha(), and webp_decode_frame().

alpha_inverse_prediction()

static void alpha_inverse_prediction ( AVFrame *  frame, enum AlphaFilter  m  )

static

Definition at line 1196 of file webp.c.

Referenced by vp8_lossy_decode_alpha().

vp8_lossy_decode_alpha()

static int vp8_lossy_decode_alpha ( AVCodecContext *  avctx, AVFrame *  p, uint8_t *  data_start, unsigned int  data_size  )

static

Definition at line 1239 of file webp.c.

Referenced by vp8_lossy_decode_frame().

vp8_lossy_decode_frame()

static int vp8_lossy_decode_frame ( AVCodecContext *  avctx, AVFrame *  p, int *  got_frame, uint8_t *  data_start, unsigned int  data_size  )

static

Definition at line 1292 of file webp.c.

Referenced by webp_decode_frame().

webp_decode_frame()

static int webp_decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 1334 of file webp.c.

webp_decode_init()

static av_cold int webp_decode_init ( AVCodecContext *  avctx )

static

Definition at line 1533 of file webp.c.

webp_decode_close()

static av_cold int webp_decode_close ( AVCodecContext *  avctx )

static

Definition at line 1544 of file webp.c.

Variable Documentation

alphabet_sizes

const uint16_t alphabet_sizes[HUFFMAN_CODES_PER_META_CODE]

static

Initial value:

= {
    NUM_LITERAL_CODES + NUM_LENGTH_CODES,
    NUM_LITERAL_CODES, NUM_LITERAL_CODES, NUM_LITERAL_CODES,
    NUM_DISTANCE_CODES
}

Definition at line 70 of file webp.c.

Referenced by decode_entropy_coded_image().

code_length_code_order

const uint8_t code_length_code_order[NUM_CODE_LENGTH_CODES]

static

Initial value:

= {
    17, 18, 0, 1, 2, 3, 4, 5, 16, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
}

Definition at line 76 of file webp.c.

Referenced by read_huffman_code_normal().

lz77_distance_offsets

const int8_t lz77_distance_offsets[NUM_SHORT_DISTANCES][2]

static

Initial value:

= {
    {  0, 1 }, {  1, 0 }, {  1, 1 }, { -1, 1 }, {  0, 2 }, {  2, 0 }, {  1, 2 }, { -1, 2 },
    {  2, 1 }, { -2, 1 }, {  2, 2 }, { -2, 2 }, {  0, 3 }, {  3, 0 }, {  1, 3 }, { -1, 3 },
    {  3, 1 }, { -3, 1 }, {  2, 3 }, { -2, 3 }, {  3, 2 }, { -3, 2 }, {  0, 4 }, {  4, 0 },
    {  1, 4 }, { -1, 4 }, {  4, 1 }, { -4, 1 }, {  3, 3 }, { -3, 3 }, {  2, 4 }, { -2, 4 },
    {  4, 2 }, { -4, 2 }, {  0, 5 }, {  3, 4 }, { -3, 4 }, {  4, 3 }, { -4, 3 }, {  5, 0 },
    {  1, 5 }, { -1, 5 }, {  5, 1 }, { -5, 1 }, {  2, 5 }, { -2, 5 }, {  5, 2 }, { -5, 2 },
    {  4, 4 }, { -4, 4 }, {  3, 5 }, { -3, 5 }, {  5, 3 }, { -5, 3 }, {  0, 6 }, {  6, 0 },
    {  1, 6 }, { -1, 6 }, {  6, 1 }, { -6, 1 }, {  2, 6 }, { -2, 6 }, {  6, 2 }, { -6, 2 },
    {  4, 5 }, { -4, 5 }, {  5, 4 }, { -5, 4 }, {  3, 6 }, { -3, 6 }, {  6, 3 }, { -6, 3 },
    {  0, 7 }, {  7, 0 }, {  1, 7 }, { -1, 7 }, {  5, 5 }, { -5, 5 }, {  7, 1 }, { -7, 1 },
    {  4, 6 }, { -4, 6 }, {  6, 4 }, { -6, 4 }, {  2, 7 }, { -2, 7 }, {  7, 2 }, { -7, 2 },
    {  3, 7 }, { -3, 7 }, {  7, 3 }, { -7, 3 }, {  5, 6 }, { -5, 6 }, {  6, 5 }, { -6, 5 },
    {  8, 0 }, {  4, 7 }, { -4, 7 }, {  7, 4 }, { -7, 4 }, {  8, 1 }, {  8, 2 }, {  6, 6 },
    { -6, 6 }, {  8, 3 }, {  5, 7 }, { -5, 7 }, {  7, 5 }, { -7, 5 }, {  8, 4 }, {  6, 7 },
    { -6, 7 }, {  7, 6 }, { -7, 6 }, {  8, 5 }, {  7, 7 }, { -7, 7 }, {  8, 6 }, {  8, 7 }
}

Definition at line 80 of file webp.c.

Referenced by decode_entropy_coded_image().

inverse_predict

const inv_predict_func inverse_predict[14]

static

Initial value:

= {
    inv_predict_0,  inv_predict_1,  inv_predict_2,  inv_predict_3,
    inv_predict_4,  inv_predict_5,  inv_predict_6,  inv_predict_7,
    inv_predict_8,  inv_predict_9,  inv_predict_10, inv_predict_11,
    inv_predict_12, inv_predict_13,
}

Definition at line 892 of file webp.c.

Referenced by inverse_prediction().

ff_webp_decoder

AVCodec ff_webp_decoder

Initial value:

= {
    .name           = "webp",
    .long_name      = NULL_IF_CONFIG_SMALL("WebP image"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_WEBP,
    .priv_data_size = sizeof(WebPContext),
    .init           = webp_decode_init,
    .decode         = webp_decode_frame,
    .close          = webp_decode_close,
    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
}

Definition at line 1556 of file webp.c.