aacfft.c 文件参考

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

宏定义
#define	NUM_FFT_SIZES   2
#define	SQRT1_2   0x5a82799a /* sqrt(1/2) in Q31 */
#define	swapcplx(p0, p1)   t = p0; t1 = *(&(p0)+1); p0 = p1; *(&(p0)+1) = *(&(p1)+1); p1 = t; *(&(p1)+1) = t1

函数
static void	BitReverse (int *inout, int tabidx)
static void	R4FirstPass (int *x, int bg)
static void	R8FirstPass (int *x, int bg)
static void	R4Core (int *x, int bg, int gp, int *wtab)
void STATNAME()	R4FFT (int tabidx, int *x)

变量
static const int	nfftTab [2] = {64, 512}
static const int	nfftlog2Tab [2] = {6, 9}

宏定义说明

NUM_FFT_SIZES

#define NUM_FFT_SIZES   2

SQRT1_2

#define SQRT1_2   0x5a82799a /* sqrt(1/2) in Q31 */

swapcplx

#define swapcplx	(		p0,
			p1
	)		t = p0; t1 = *(&(p0)+1); p0 = p1; *(&(p0)+1) = *(&(p1)+1); p1 = t; *(&(p1)+1) = t1

函数说明

BitReverse()

static void BitReverse ( int *  inout, int  tabidx  )

static

R4Core()

static void R4Core ( int *  x, int  bg, int  gp, int *  wtab  )

static

R4FFT()

void STATNAME() R4FFT	(	int	tabidx,
		int *	x
	)

R4FirstPass()

static void R4FirstPass ( int *  x, int  bg  )

static

R8FirstPass()

static void R8FirstPass ( int *  x, int  bg  )

static

变量说明

nfftlog2Tab

const int nfftlog2Tab[2] = {6, 9}

static

nfftTab

const int nfftTab[2] = {64, 512}

static