av1/encoder/hash.h

/*
 * Copyright (c) 2021, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 3-Clause Clear License
 * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
 * License was not distributed with this source code in the LICENSE file, you
 * can obtain it at aomedia.org/license/software-license/bsd-3-c-c/.  If the
 * Alliance for Open Media Patent License 1.0 was not distributed with this
 * source code in the PATENTS file, you can obtain it at
 * aomedia.org/license/patent-license/.
 */

#ifndef AOM_AV1_ENCODER_HASH_H_
#define AOM_AV1_ENCODER_HASH_H_

#include "config/aom_config.h"

#include "aom/aom_integer.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef struct _crc_calculator {
  uint32_t remainder;
  uint32_t trunc_poly;
  uint32_t bits;
  uint32_t table[256];
  uint32_t final_result_mask;
} CRC_CALCULATOR;

// Initialize the crc calculator. It must be executed at least once before
// calling av1_get_crc_value().
void av1_crc_calculator_init(CRC_CALCULATOR *p_crc_calculator, uint32_t bits,
                             uint32_t truncPoly);
uint32_t av1_get_crc_value(CRC_CALCULATOR *p_crc_calculator, uint8_t *p,
                           int length);

// CRC32C: POLY = 0x82f63b78;
typedef struct _CRC32C {
  /* Table for a quadword-at-a-time software crc. */
  uint32_t table[8][256];
} CRC32C;

// init table for software version crc32c
void av1_crc32c_calculator_init(CRC32C *p_crc32c);

#define AOM_BUFFER_SIZE_FOR_BLOCK_HASH (1 << (2 * (MAX_SB_SIZE_LOG2 - 1)))

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // AOM_AV1_ENCODER_HASH_H_