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139 lines
4.1 KiB
C
139 lines
4.1 KiB
C
/*Copyright (c) 2003-2004, Mark Borgerding
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Lots of modifications by Jean-Marc Valin
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Copyright (c) 2005-2007, Xiph.Org Foundation
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Copyright (c) 2008, Xiph.Org Foundation, CSIRO
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.*/
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#ifndef KISS_FFT_H
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#define KISS_FFT_H
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#include <stdlib.h>
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#include <math.h>
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#include "arch.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef USE_SIMD
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# include <xmmintrin.h>
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# define kiss_fft_scalar __m128
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#define KISS_FFT_MALLOC(nbytes) memalign(16,nbytes)
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#else
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#define KISS_FFT_MALLOC opus_alloc
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#endif
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#ifdef FIXED_POINT
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#include "arch.h"
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# define kiss_fft_scalar opus_int32
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# define kiss_twiddle_scalar opus_int16
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#else
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# ifndef kiss_fft_scalar
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/* default is float */
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# define kiss_fft_scalar float
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# define kiss_twiddle_scalar float
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# define KF_SUFFIX _celt_single
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# endif
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#endif
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typedef struct {
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kiss_fft_scalar r;
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kiss_fft_scalar i;
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}kiss_fft_cpx;
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typedef struct {
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kiss_twiddle_scalar r;
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kiss_twiddle_scalar i;
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}kiss_twiddle_cpx;
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#define MAXFACTORS 8
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/* e.g. an fft of length 128 has 4 factors
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as far as kissfft is concerned
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4*4*4*2
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*/
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typedef struct kiss_fft_state{
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int nfft;
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#ifndef FIXED_POINT
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kiss_fft_scalar scale;
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#endif
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int shift;
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opus_int16 factors[2*MAXFACTORS];
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const opus_int16 *bitrev;
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const kiss_twiddle_cpx *twiddles;
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} kiss_fft_state;
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/*typedef struct kiss_fft_state* kiss_fft_cfg;*/
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/**
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* opus_fft_alloc
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*
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* Initialize a FFT (or IFFT) algorithm's cfg/state buffer.
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*
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* typical usage: kiss_fft_cfg mycfg=opus_fft_alloc(1024,0,NULL,NULL);
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*
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* The return value from fft_alloc is a cfg buffer used internally
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* by the fft routine or NULL.
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*
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* If lenmem is NULL, then opus_fft_alloc will allocate a cfg buffer using malloc.
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* The returned value should be free()d when done to avoid memory leaks.
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*
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* The state can be placed in a user supplied buffer 'mem':
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* If lenmem is not NULL and mem is not NULL and *lenmem is large enough,
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* then the function places the cfg in mem and the size used in *lenmem
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* and returns mem.
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*
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* If lenmem is not NULL and ( mem is NULL or *lenmem is not large enough),
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* then the function returns NULL and places the minimum cfg
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* buffer size in *lenmem.
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* */
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kiss_fft_state *opus_fft_alloc_twiddles(int nfft,void * mem,size_t * lenmem, const kiss_fft_state *base);
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kiss_fft_state *opus_fft_alloc(int nfft,void * mem,size_t * lenmem);
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/**
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* opus_fft(cfg,in_out_buf)
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*
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* Perform an FFT on a complex input buffer.
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* for a forward FFT,
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* fin should be f[0] , f[1] , ... ,f[nfft-1]
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* fout will be F[0] , F[1] , ... ,F[nfft-1]
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* Note that each element is complex and can be accessed like
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f[k].r and f[k].i
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* */
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void opus_fft(const kiss_fft_state *cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout);
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void opus_ifft(const kiss_fft_state *cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout);
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void opus_fft_free(const kiss_fft_state *cfg);
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#ifdef __cplusplus
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}
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#endif
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#endif
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