av1/common/odintrin.h

/*
 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. 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 www.aomedia.org/license/patent.
 */
#ifndef AV1_COMMON_ODINTRIN_H_
#define AV1_COMMON_ODINTRIN_H_

#include "av1/common/enums.h"
#include "aom/aom_integer.h"
#include "aom_dsp/aom_dsp_common.h"
#include "aom_ports/bitops.h"

#ifdef __cplusplus
extern "C" {
#endif

/*Smallest blocks are 4x4*/
#define OD_LOG_BSIZE0 (2)
/*There are 5 block sizes total (4x4, 8x8, 16x16, 32x32 and 64x64).*/
#define OD_NBSIZES (5)
/*The log of the maximum length of the side of a block.*/
#define OD_LOG_BSIZE_MAX (OD_LOG_BSIZE0 + OD_NBSIZES - 1)
/*The maximum length of the side of a block.*/
#define OD_BSIZE_MAX (1 << OD_LOG_BSIZE_MAX)

typedef int od_coeff;

typedef int16_t od_dering_in;

#define OD_DIVU_DMAX (1024)

extern uint32_t OD_DIVU_SMALL_CONSTS[OD_DIVU_DMAX][2];

/*Translate unsigned division by small divisors into multiplications.*/
#define OD_DIVU_SMALL(_x, _d)                                     \
  ((uint32_t)((OD_DIVU_SMALL_CONSTS[(_d)-1][0] * (uint64_t)(_x) + \
               OD_DIVU_SMALL_CONSTS[(_d)-1][1]) >>                \
              32) >>                                              \
   (OD_ILOG(_d) - 1))

#define OD_DIVU(_x, _d) \
  (((_d) < OD_DIVU_DMAX) ? (OD_DIVU_SMALL((_x), (_d))) : ((_x) / (_d)))

#define OD_MINI AOMMIN
#define OD_CLAMPI(min, val, max) clamp((val), (min), (max))

#define OD_CLZ0 (1)
#define OD_CLZ(x) (-get_msb(x))
#define OD_ILOG_NZ(x) (OD_CLZ0 - OD_CLZ(x))
/*Note that __builtin_clz is not defined when x == 0, according to the gcc
   documentation (and that of the x86 BSR instruction that implements it), so
   we have to special-case it.
  We define a special version of the macro to use when x can be zero.*/
#define OD_ILOG(x) ((x) ? OD_ILOG_NZ(x) : 0)

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

#endif  // AV1_COMMON_ODINTRIN_H_