gstreamer/gst-libs/gst/fft/kiss_fft_s16.h
Sebastian Dröge fdfb70e262 fft: Merge kissfft 1.2.8
This reduces memory footprint for the FFT and adds
OpenMP support (but we don't use it).
2010-05-24 11:27:36 +02:00

106 lines
3 KiB
C

#ifndef KISS_FFT_S16_H
#define KISS_FFT_S16_H
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <glib.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
ATTENTION!
If you would like a :
-- a utility that will handle the caching of fft objects
-- real-only (no imaginary time component ) FFT
-- a multi-dimensional FFT
-- a command-line utility to perform ffts
-- a command-line utility to perform fast-convolution filtering
Then see kfc.h kiss_fftr.h kiss_fftnd.h fftutil.c kiss_fastfir.c
in the tools/ directory.
*/
#define KISS_FFT_S16_MALLOC g_malloc
#include "_stdint.h"
#define kiss_fft_s16_scalar int16_t
typedef struct {
kiss_fft_s16_scalar r;
kiss_fft_s16_scalar i;
}kiss_fft_s16_cpx;
typedef struct kiss_fft_s16_state* kiss_fft_s16_cfg;
/*
* kiss_fft_s16_alloc
*
* Initialize a FFT (or IFFT) algorithm's cfg/state buffer.
*
* typical usage: kiss_fft_s16_cfg mycfg=kiss_fft_s16_alloc(1024,0,NULL,NULL);
*
* The return value from fft_alloc is a cfg buffer used internally
* by the fft routine or NULL.
*
* If lenmem is NULL, then kiss_fft_s16_alloc will allocate a cfg buffer using malloc.
* The returned value should be free()d when done to avoid memory leaks.
*
* The state can be placed in a user supplied buffer 'mem':
* If lenmem is not NULL and mem is not NULL and *lenmem is large enough,
* then the function places the cfg in mem and the size used in *lenmem
* and returns mem.
*
* If lenmem is not NULL and ( mem is NULL or *lenmem is not large enough),
* then the function returns NULL and places the minimum cfg
* buffer size in *lenmem.
* */
kiss_fft_s16_cfg kiss_fft_s16_alloc(int nfft,int inverse_fft,void * mem,size_t * lenmem);
/*
* kiss_fft(cfg,in_out_buf)
*
* Perform an FFT on a complex input buffer.
* for a forward FFT,
* fin should be f[0] , f[1] , ... ,f[nfft-1]
* fout will be F[0] , F[1] , ... ,F[nfft-1]
* Note that each element is complex and can be accessed like
f[k].r and f[k].i
* */
void kiss_fft_s16(kiss_fft_s16_cfg cfg,const kiss_fft_s16_cpx *fin,kiss_fft_s16_cpx *fout);
/*
A more generic version of the above function. It reads its input from every Nth sample.
* */
void kiss_fft_s16_stride(kiss_fft_s16_cfg cfg,const kiss_fft_s16_cpx *fin,kiss_fft_s16_cpx *fout,int fin_stride);
/* If kiss_fft_s16_alloc allocated a buffer, it is one contiguous
buffer and can be simply free()d when no longer needed*/
#define kiss_fft_s16_free g_free
/*
Cleans up some memory that gets managed internally. Not necessary to call, but it might clean up
your compiler output to call this before you exit.
*/
void kiss_fft_s16_cleanup(void);
/*
* Returns the smallest integer k, such that k>=n and k has only "fast" factors (2,3,5)
*/
int kiss_fft_s16_next_fast_size(int n);
/* for real ffts, we need an even size */
#define kiss_fftr_next_fast_size_real(n) \
(kiss_fft_next_fast_size( ((n)+1)>>1)<<1)
#ifdef __cplusplus
}
#endif
#endif