gstreamer/subprojects/gst-plugins-base/gst-libs/gst/fft/kiss_fftr_s32.h

54 lines
1.1 KiB
C

/*
* 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_s32.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_s32_state *kiss_fftr_s32_cfg;
kiss_fftr_s32_cfg kiss_fftr_s32_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_fftr_s32(kiss_fftr_s32_cfg cfg,const kiss_fft_s32_scalar *timedata,kiss_fft_s32_cpx *freqdata);
/*
input timedata has nfft scalar points
output freqdata has nfft/2+1 complex points
*/
void kiss_fftri_s32(kiss_fftr_s32_cfg cfg,const kiss_fft_s32_cpx *freqdata,kiss_fft_s32_scalar *timedata);
/*
input freqdata has nfft/2+1 complex points
output timedata has nfft scalar points
*/
#define kiss_fftr_s32_free KISS_FFT_S32_FREE
#ifdef __cplusplus
}
#endif
#endif