#include "mp3coder.h"
#include "mp3assembly.h"

宏定义
#define	DEF_NFRACBITS (DQ_FRACBITS_OUT - 2 - 2 - 15)

#define	CSHIFT 12 /* coefficients have 12 leading sign bits for early-terminating mulitplies */

#define	MC0M(x)

#define	MC1M(x)

#define	MC2M(x)

#define	MC0S(x)

#define	MC1S(x)

#define	MC2S(x)

函数
static _XIF_ short	ClipToShort (int x, int fracBits)

_XIF_ void	PolyphaseMono (short pcm, int vbuf, const int *coefBase)

_XIF_ void	PolyphaseStereo (short pcm, int vbuf, const int *coefBase)

宏定义说明

◆ CSHIFT

#define CSHIFT 12 /* coefficients have 12 leading sign bits for early-terminating mulitplies */

◆ DEF_NFRACBITS

#define DEF_NFRACBITS (DQ_FRACBITS_OUT - 2 - 2 - 15)

◆ MC0M

#define MC0M ( x )

值:

{ \
    c1 = *coef;     coef++;     c2 = *coef;     coef++; \
    vLo = *(vb1+(x));           vHi = *(vb1+(23-(x))); \
    sum1L = MADD64(sum1L, vLo,  c1);    sum1L = MADD64(sum1L, vHi, -c2); \
}

◆ MC0S

#define MC0S ( x )

值:

{ \
    c1 = *coef;     coef++;     c2 = *coef;     coef++; \
    vLo = *(vb1+(x));       vHi = *(vb1+(23-(x))); \
    sum1L = MADD64(sum1L, vLo,  c1);    sum1L = MADD64(sum1L, vHi, -c2); \
    vLo = *(vb1+32+(x));    vHi = *(vb1+32+(23-(x))); \
    sum1R = MADD64(sum1R, vLo,  c1);    sum1R = MADD64(sum1R, vHi, -c2); \
}

◆ MC1M

#define MC1M ( x )

值:

{ \
    c1 = *coef;     coef++; \
    vLo = *(vb1+(x)); \
    sum1L = MADD64(sum1L, vLo,  c1); \
}

◆ MC1S

#define MC1S ( x )

值:

{ \
    c1 = *coef;     coef++; \
    vLo = *(vb1+(x)); \
    sum1L = MADD64(sum1L, vLo,  c1); \
    vLo = *(vb1+32+(x)); \
    sum1R = MADD64(sum1R, vLo,  c1); \
}

◆ MC2M

#define MC2M ( x )

值:

{ \
        c1 = *coef;     coef++;     c2 = *coef;     coef++; \
        vLo = *(vb1+(x));   vHi = *(vb1+(23-(x))); \
        sum1L = MADD64(sum1L, vLo,  c1);    sum2L = MADD64(sum2L, vLo,  c2); \
        sum1L = MADD64(sum1L, vHi, -c2);    sum2L = MADD64(sum2L, vHi,  c1); \
}

◆ MC2S

#define MC2S ( x )

值:

{ \
        c1 = *coef;     coef++;     c2 = *coef;     coef++; \
        vLo = *(vb1+(x));   vHi = *(vb1+(23-(x))); \
        sum1L = MADD64(sum1L, vLo,  c1);    sum2L = MADD64(sum2L, vLo,  c2); \
        sum1L = MADD64(sum1L, vHi, -c2);    sum2L = MADD64(sum2L, vHi,  c1); \
        vLo = *(vb1+32+(x));    vHi = *(vb1+32+(23-(x))); \
        sum1R = MADD64(sum1R, vLo,  c1);    sum2R = MADD64(sum2R, vLo,  c2); \
        sum1R = MADD64(sum1R, vHi, -c2);    sum2R = MADD64(sum2R, vHi,  c1); \
}

函数说明

◆ ClipToShort()

static _XIF_ short ClipToShort	(	int	x,
		int	fracBits
	)

static

◆ PolyphaseMono()

_XIF_ void PolyphaseMono	(	short *	pcm,
		int *	vbuf,
		const int *	coefBase
	)

◆ PolyphaseStereo()

_XIF_ void PolyphaseStereo	(	short *	pcm,
		int *	vbuf,
		const int *	coefBase
	)