140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
/*Copyright (c) 2003-2004, Mark Borgerding
|
|
Lots of modifications by Jean-Marc Valin
|
|
Copyright (c) 2005-2007, Xiph.Org Foundation
|
|
Copyright (c) 2008, Xiph.Org Foundation, CSIRO
|
|
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright notice,
|
|
this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.*/
|
|
|
|
#ifndef KISS_FFT_H
|
|
#define KISS_FFT_H
|
|
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
#include "arch.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#ifdef USE_SIMD
|
|
# include <xmmintrin.h>
|
|
# define kiss_fft_scalar __m128
|
|
#define KISS_FFT_MALLOC(nbytes) memalign(16,nbytes)
|
|
#else
|
|
#define KISS_FFT_MALLOC opus_alloc
|
|
#endif
|
|
|
|
#ifdef OPUS_FIXED_POINT
|
|
#include "arch.h"
|
|
|
|
# define kiss_fft_scalar opus_int32
|
|
# define kiss_twiddle_scalar opus_int16
|
|
|
|
|
|
#else
|
|
# ifndef kiss_fft_scalar
|
|
/* default is float */
|
|
# define kiss_fft_scalar float
|
|
# define kiss_twiddle_scalar float
|
|
# define KF_SUFFIX _celt_single
|
|
# endif
|
|
#endif
|
|
|
|
typedef struct {
|
|
kiss_fft_scalar r;
|
|
kiss_fft_scalar i;
|
|
}kiss_fft_cpx;
|
|
|
|
typedef struct {
|
|
kiss_twiddle_scalar r;
|
|
kiss_twiddle_scalar i;
|
|
}kiss_twiddle_cpx;
|
|
|
|
#define MAXFACTORS 8
|
|
/* e.g. an fft of length 128 has 4 factors
|
|
as far as kissfft is concerned
|
|
4*4*4*2
|
|
*/
|
|
|
|
typedef struct kiss_fft_state{
|
|
int nfft;
|
|
#ifndef OPUS_FIXED_POINT
|
|
kiss_fft_scalar scale;
|
|
#endif
|
|
int shift;
|
|
opus_int16 factors[2*MAXFACTORS];
|
|
const opus_int16 *bitrev;
|
|
const kiss_twiddle_cpx *twiddles;
|
|
} kiss_fft_state;
|
|
|
|
/*typedef struct kiss_fft_state* kiss_fft_cfg;*/
|
|
|
|
/**
|
|
* opus_fft_alloc
|
|
*
|
|
* Initialize a FFT (or IFFT) algorithm's cfg/state buffer.
|
|
*
|
|
* typical usage: kiss_fft_cfg mycfg=opus_fft_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 opus_fft_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_state *opus_fft_alloc_twiddles(int nfft,void * mem,size_t * lenmem, const kiss_fft_state *base);
|
|
|
|
kiss_fft_state *opus_fft_alloc(int nfft,void * mem,size_t * lenmem);
|
|
|
|
/**
|
|
* opus_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 opus_fft(const kiss_fft_state *cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout);
|
|
void opus_ifft(const kiss_fft_state *cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout);
|
|
|
|
void opus_fft_free(const kiss_fft_state *cfg);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|