1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #ifndef AOM_AV1_ENCODER_HASH_H_ 13 #define AOM_AV1_ENCODER_HASH_H_ 14 15 #include "config/aom_config.h" 16 17 #include "aom/aom_integer.h" 18 19 #ifdef __cplusplus 20 extern "C" { 21 #endif 22 23 typedef struct _crc_calculator { 24 uint32_t remainder; 25 uint32_t trunc_poly; 26 uint32_t bits; 27 uint32_t table[256]; 28 uint32_t final_result_mask; 29 } CRC_CALCULATOR; 30 31 // Initialize the crc calculator. It must be executed at least once before 32 // calling av1_get_crc_value(). 33 void av1_crc_calculator_init(CRC_CALCULATOR *p_crc_calculator, uint32_t bits, 34 uint32_t truncPoly); 35 uint32_t av1_get_crc_value(void *crc_calculator, uint8_t *p, int length); 36 37 // CRC32C: POLY = 0x82f63b78; 38 typedef struct _CRC32C { 39 /* Table for a quadword-at-a-time software crc. */ 40 uint32_t table[8][256]; 41 } CRC32C; 42 43 // init table for software version crc32c 44 void av1_crc32c_calculator_init(CRC32C *p_crc32c); 45 46 #define AOM_BUFFER_SIZE_FOR_BLOCK_HASH (4096) 47 48 #ifdef __cplusplus 49 } // extern "C" 50 #endif 51 52 #endif // AOM_AV1_ENCODER_HASH_H_ 53
