aacpns.c 文件参考

#include "aaccoder.h"
#include "aacassembly.h"

宏定义
#define	NUM_ITER_INVSQRT   4
#define	X0_COEF_2   0xc0000000 /* Q29: -2.0 */
#define	X0_OFF_2   0x60000000 /* Q29: 3.0 */
#define	Q26_3   0x0c000000 /* Q26: 3.0 */

函数
static unsigned int	Get32BitVal (unsigned int *last)
static int	InvRootR (int r)
static int	ScaleNoiseVector (int *coef, int nVals, int sf)
static void	GenerateNoiseVector (int *coef, int *last, int nVals)
static void	CopyNoiseVector (int *coefL, int *coefR, int nVals)
int	PNS (AACDecInfo *aacDecInfo, int ch)

变量
static const int	pow14 [4]

宏定义说明

NUM_ITER_INVSQRT

#define NUM_ITER_INVSQRT   4

Q26_3

#define Q26_3   0x0c000000 /* Q26: 3.0 */

X0_COEF_2

#define X0_COEF_2   0xc0000000 /* Q29: -2.0 */

X0_OFF_2

#define X0_OFF_2   0x60000000 /* Q29: 3.0 */

函数说明

CopyNoiseVector()

static void CopyNoiseVector ( int *  coefL, int *  coefR, int  nVals  )

static

GenerateNoiseVector()

static void GenerateNoiseVector ( int *  coef, int *  last, int  nVals  )

static

Get32BitVal()

static unsigned int Get32BitVal ( unsigned int *  last )

static

InvRootR()

static int InvRootR ( int  r )

static

PNS()

int PNS	(	AACDecInfo *	aacDecInfo,
		int	ch
	)

ScaleNoiseVector()

static int ScaleNoiseVector ( int *  coef, int  nVals, int  sf  )

static

变量说明

pow14

const int pow14[4]

static

初始值:

= { 
    0x40000000, 0x4c1bf829, 0x5a82799a, 0x6ba27e65
}