format_constants.h revision 1e7bf8805bd030c19924a5306837ecd72c295751
1a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Copyright 2012 Google Inc. All Rights Reserved. 2a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// 3a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// This code is licensed under the same terms as WebM: 4a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Software License Agreement: http://www.webmproject.org/license/software/ 5a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ 6a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// ----------------------------------------------------------------------------- 7a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// 8a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Internal header for constants related to WebP file format. 9a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// 10a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Author: Urvang (urvang@google.com) 11a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 12a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#ifndef WEBP_WEBP_FORMAT_CONSTANTS_H_ 13a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define WEBP_WEBP_FORMAT_CONSTANTS_H_ 14a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 15a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// VP8 related constants. 16a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8_SIGNATURE 0x9d012a // Signature in VP8 data. 17a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8_MAX_PARTITION0_SIZE (1 << 19) // max size of mode partition 18a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8_MAX_PARTITION_SIZE (1 << 24) // max size for token partition 19a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8_FRAME_HEADER_SIZE 10 // Size of the frame header within VP8 data. 20a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 21a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// VP8L related constants. 22a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8L_SIGNATURE_SIZE 1 // VP8L signature size. 23a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8L_MAGIC_BYTE 0x2f // VP8L signature byte. 24a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8L_IMAGE_SIZE_BITS 14 // Number of bits used to store 25a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // width and height. 26a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8L_VERSION_BITS 3 // 3 bits reserved for version. 27a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8L_VERSION 0 // version 0 28a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8L_FRAME_HEADER_SIZE 5 // Size of the VP8L frame header. 29a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 30a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define MAX_PALETTE_SIZE 256 31a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define MAX_CACHE_BITS 11 32a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define HUFFMAN_CODES_PER_META_CODE 5 33a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define ARGB_BLACK 0xff000000 34a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 35a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define DEFAULT_CODE_LENGTH 8 36a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define MAX_ALLOWED_CODE_LENGTH 15 37a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 38a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define NUM_LITERAL_CODES 256 39a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define NUM_LENGTH_CODES 24 40a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define NUM_DISTANCE_CODES 40 41a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define CODE_LENGTH_CODES 19 42a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 43a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define MIN_HUFFMAN_BITS 2 // min number of Huffman bits 44a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define MAX_HUFFMAN_BITS 9 // max number of Huffman bits 45a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 46a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define TRANSFORM_PRESENT 1 // The bit to be written when next data 47a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // to be read is a transform. 48a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define NUM_TRANSFORMS 4 // Maximum number of allowed transform 49a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // in a bitstream. 50a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Aroratypedef enum { 51a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora PREDICTOR_TRANSFORM = 0, 52a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora CROSS_COLOR_TRANSFORM = 1, 53a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora SUBTRACT_GREEN = 2, 54a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora COLOR_INDEXING_TRANSFORM = 3 55a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} VP8LImageTransformType; 56a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 57a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Alpha related constants. 58a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define ALPHA_HEADER_LEN 1 59a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define ALPHA_NO_COMPRESSION 0 60a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define ALPHA_LOSSLESS_COMPRESSION 1 61a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define ALPHA_PREPROCESSED_LEVELS 1 62a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 63a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Mux related constants. 64a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define TAG_SIZE 4 // Size of a chunk tag (e.g. "VP8L"). 65a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define CHUNK_SIZE_BYTES 4 // Size needed to store chunk's size. 66a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define CHUNK_HEADER_SIZE 8 // Size of a chunk header. 67a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define RIFF_HEADER_SIZE 12 // Size of the RIFF header ("RIFFnnnnWEBP"). 681e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#define ANMF_CHUNK_SIZE 16 // Size of an ANMF chunk. 691e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#define ANIM_CHUNK_SIZE 6 // Size of an ANIM chunk. 701e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#define FRGM_CHUNK_SIZE 6 // Size of a FRGM chunk. 71a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define VP8X_CHUNK_SIZE 10 // Size of a VP8X chunk. 72a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 731e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// VP8X Feature Flags. 741e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#if !(defined(__cplusplus) || defined(c_plusplus)) 751e7bf8805bd030c19924a5306837ecd72c295751Vikas Aroratypedef enum WebPFeatureFlags WebPFeatureFlags; 761e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#endif 771e7bf8805bd030c19924a5306837ecd72c295751Vikas Aroraenum WebPFeatureFlags { 781e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora FRAGMENTS_FLAG = 0x00000001, 791e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora ANIMATION_FLAG = 0x00000002, 801e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora XMP_FLAG = 0x00000004, 811e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora EXIF_FLAG = 0x00000008, 821e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora ALPHA_FLAG = 0x00000010, 831e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora ICCP_FLAG = 0x00000020 841e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora}; 85a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 86a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define MAX_CANVAS_SIZE (1 << 24) // 24-bit max for VP8X width/height. 87a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define MAX_IMAGE_AREA (1ULL << 32) // 32-bit max for width x height. 88228b1b1f024974d7832b51a3f266e5edc9110c02Vikas Arora#define MAX_LOOP_COUNT (1 << 16) // maximum value for loop-count 89228b1b1f024974d7832b51a3f266e5edc9110c02Vikas Arora#define MAX_DURATION (1 << 24) // maximum duration 901e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#define MAX_POSITION_OFFSET (1 << 24) // maximum frame/fragment x/y offset 91a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 92a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Maximum chunk payload is such that adding the header and padding won't 93a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// overflow a uint32_t. 94a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define MAX_CHUNK_PAYLOAD (~0U - CHUNK_HEADER_SIZE - 1) 95a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 96a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#endif /* WEBP_WEBP_FORMAT_CONSTANTS_H_ */ 97