kiss_fftr.h

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/*
 *  Copyright (c) 2003-2004, Mark Borgerding. All rights reserved.
 *  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
 *
 *  SPDX-License-Identifier: BSD-3-Clause
 *  See COPYING file for more information.
 */
 
#ifndef KISS_FTR_H
#define KISS_FTR_H
 
#include "kiss_fft.h"
#ifdef __cplusplus
extern "C" {
#endif
 
/*
 
 Real optimized version can save about 45% cpu time vs. complex fft of a real seq.
 
 
 
 */
 
typedef struct kiss_fftr_state* kiss_fftr_cfg;
 
kiss_fftr_cfg KISS_FFT_API kiss_fftr_alloc(int nfft, int inverse_fft, void* mem,
                                           size_t* lenmem);
/*
 nfft must be even
 
 If you don't care to allocate space, use mem = lenmem = NULL
*/
 
void KISS_FFT_API kiss_fftr(kiss_fftr_cfg cfg, const kiss_fft_scalar* timedata,
                            kiss_fft_cpx* freqdata);
/*
 input timedata has nfft scalar points
 output freqdata has nfft/2+1 complex points
*/
 
void KISS_FFT_API kiss_fftri(kiss_fftr_cfg cfg, const kiss_fft_cpx* freqdata,
                             kiss_fft_scalar* timedata);
/*
 input freqdata has  nfft/2+1 complex points
 output timedata has nfft scalar points
*/
 
#define kiss_fftr_free KISS_FFT_FREE
 
#ifdef __cplusplus
}
#endif
#endif