aacsbrmath.c 文件参考

#include "aacsbr.h"
#include "aacassembly.h"

宏定义
#define	Q28_2   0x20000000 /* Q28: 2.0 */
#define	Q28_15   0x30000000 /* Q28: 1.5 */
#define	NUM_ITER_IRN   5
#define	NUM_TERMS_RPI   5
#define	LOG2_EXP_INV   0x58b90bfc /* 1/log2(e), Q31 */

函数
int STATNAME()	InvRNormalized (int r)
int STATNAME()	RatioPowInv (int a, int b, int c)
int STATNAME()	SqrtFix (int q, int fBitsIn, int *fBitsOut)

变量
static const int	invTab [5] = {0x40000000, 0x20000000, 0x15555555, 0x10000000, 0x0ccccccd}

宏定义说明

LOG2_EXP_INV

#define LOG2_EXP_INV   0x58b90bfc /* 1/log2(e), Q31 */

NUM_ITER_IRN

#define NUM_ITER_IRN   5

NUM_TERMS_RPI

#define NUM_TERMS_RPI   5

Q28_15

#define Q28_15   0x30000000 /* Q28: 1.5 */

Q28_2

#define Q28_2   0x20000000 /* Q28: 2.0 */

函数说明

InvRNormalized()

int STATNAME() InvRNormalized

(

int

r

)

RatioPowInv()

int STATNAME() RatioPowInv	(	int	a,
		int	b,
		int	c
	)

SqrtFix()

int STATNAME() SqrtFix	(	int	q,
		int	fBitsIn,
		int *	fBitsOut
	)

变量说明

invTab

const int invTab[5] = {0x40000000, 0x20000000, 0x15555555, 0x10000000, 0x0ccccccd}

static