/**************************************

		SV_realFFT.h

***************************************/



#include "SV_common_include.h"



//#define FFTLOGLEN 9

//#define FFTLEN (1<<FFTLOGLEN)       // 512

//#define FFTOVERLAP (FFTLEN*3/8)     // 192



//typedef struct{

//    int re, im;

//}ComplexInt;





// FFT 1 channel

typedef struct{

    int winbuf_0[FFTLEN];

    int winbuf_1[FFTLEN];

    int *pa, *pb;

//    short* win_coeffs;

}SV_realFFT_1ch_T;



// Processing 1ch

extern void SV_realFFT_1ch_Exe(ComplexInt* out, int* in, int n, SV_realFFT_1ch_T* p_struct);

// out - spectrum

// in - input PCM data

// n - number of samples (must be 1<<loglen - see Init() below)

// p_struct - pointer to the module structure



// Init 1ch

extern void SV_realFFT_1ch_Init(SV_realFFT_1ch_T* p_struct);

// loglen - logarithm of fft length

// p_struct - pointer to the module structure (to be initialized)





// FFT 2 channel

typedef struct{

    int winbuf_ch1_0[FFTLEN];

    int winbuf_ch1_1[FFTLEN];

    int winbuf_ch2_0[FFTLEN];

    int winbuf_ch2_1[FFTLEN];

    int *pa, *pb, *pc, *pd;

//    short* win_coeffs;

}SV_realFFT_2ch_T;



// Processing 1ch

extern void SV_realFFT_2ch_Exe(ComplexInt* out0, ComplexInt* out1, int* in0, int* in1, int n, SV_realFFT_2ch_T* p_struct);

// out0, out1 - output spectrums

// in0, in1 - input PCM data

// n - number of samples (must be 1<<loglen - see Init() below)

// p_struct - pointer to the module structure



// Init 1ch

extern void SV_realFFT_2ch_Init(SV_realFFT_2ch_T* p_struct);

// loglen - logarithm of fft length

// p_struct - pointer to the module structure (to be initialized)





// IFFT 1 channel



// Processing 1ch

extern void SV_realIFFT_1ch_Exe(int* out, ComplexInt* in, int n, SV_realFFT_1ch_T* p_struct);

// in - PCM data

// out - input spectrum

// n - number of samples (must be 1<<loglen - see Init() below)

// p_struct - pointer to the module structure



// Init 1ch

extern void SV_realIFFT_1ch_Init(SV_realFFT_1ch_T* p_struct);

// loglen - logarithm of fft length

// p_struct - pointer to the module structure (to be initialized)