aacsbrhfgen.c 文件参考

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

宏定义
#define	FBITS_LPCOEFS   29 /* Q29 for range of (-4, 4) */
#define	MAG_16   (16 * (1 << (32 - (2*(32-FBITS_LPCOEFS))))) /* i.e. 16 in Q26 format */
#define	RELAX_COEF   0x7ffff79c /* 1.0 / (1.0 + 1e-6), Q31 */

函数
void STATNAME()	CVKernel1 (int *XBuf, int *accBuf)
static int	CalcCovariance1 (int *XBuf, int *p01reN, int *p01imN, int *p12reN, int *p12imN, int *p11reN, int *p22reN)
void STATNAME()	CVKernel2 (int *XBuf, int *accBuf)
static int	CalcCovariance2 (int *XBuf, int *p02reN, int *p02imN)
static void	CalcLPCoefs (int *XBuf, int *a0re, int *a0im, int *a1re, int *a1im, int gb)
void STATNAME()	GenerateHighFreq (PSInfoSBR *psi, SBRGrid *sbrGrid, SBRFreq *sbrFreq, SBRChan *sbrChan, int ch)

变量
static const int	newBWTab [4][4]

宏定义说明

FBITS_LPCOEFS

#define FBITS_LPCOEFS   29 /* Q29 for range of (-4, 4) */

MAG_16

#define MAG_16   (16 * (1 << (32 - (2*(32-FBITS_LPCOEFS))))) /* i.e. 16 in Q26 format */

RELAX_COEF

#define RELAX_COEF   0x7ffff79c /* 1.0 / (1.0 + 1e-6), Q31 */

函数说明

CalcCovariance1()

static int CalcCovariance1 ( int *  XBuf, int *  p01reN, int *  p01imN, int *  p12reN, int *  p12imN, int *  p11reN, int *  p22reN  )

static

CalcCovariance2()

static int CalcCovariance2 ( int *  XBuf, int *  p02reN, int *  p02imN  )

static

CalcLPCoefs()

static void CalcLPCoefs ( int *  XBuf, int *  a0re, int *  a0im, int *  a1re, int *  a1im, int  gb  )

static

CVKernel1()

void STATNAME() CVKernel1	(	int *	XBuf,
		int *	accBuf
	)

CVKernel2()

void STATNAME() CVKernel2	(	int *	XBuf,
		int *	accBuf
	)

GenerateHighFreq()

void STATNAME() GenerateHighFreq	(	PSInfoSBR *	psi,
		SBRGrid *	sbrGrid,
		SBRFreq *	sbrFreq,
		SBRChan *	sbrChan,
		int	ch
	)

变量说明

newBWTab

const int newBWTab[4][4]

static

初始值:

= {
    {0x00000000, 0x4ccccccd, 0x73333333, 0x7d70a3d7},
    {0x4ccccccd, 0x60000000, 0x73333333, 0x7d70a3d7},
    {0x00000000, 0x60000000, 0x73333333, 0x7d70a3d7},
    {0x00000000, 0x60000000, 0x73333333, 0x7d70a3d7},
}