995dcb610c
Took the opportunity to undo the Godot changed made to the
opus source. The opus module should eventually be built in its
own environment to avoid polluting others with too many include
dirs and defines.
TODO: Fix the platform/ stuff for opus.
(cherry picked from commit d9a291f641)
speex module was only added while cherry-picking, as speex is removed
in the master branch but we don't want to break compatibility in 2.1.x.
Unbundling wasn't done as the module uses the internal speex_free,
so it would require some more work.
108 lines
2.8 KiB
C++
108 lines
2.8 KiB
C++
#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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/*
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ATTENTION!
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If you would like a :
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-- a utility that will handle the caching of fft objects
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-- real-only (no imaginary time component ) FFT
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-- a multi-dimensional FFT
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-- a command-line utility to perform ffts
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-- a command-line utility to perform fast-convolution filtering
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Then see kfc.h kiss_fftr.h kiss_fftnd.h fftutil.c kiss_fastfir.c
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in the tools/ directory.
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*/
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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 speex_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 spx_int16_t
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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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# 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 kiss_fft_state* kiss_fft_cfg;
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/*
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* kiss_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=kiss_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 kiss_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_cfg kiss_fft_alloc(int nfft,int inverse_fft,void * mem,size_t * lenmem);
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/*
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* kiss_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 kiss_fft(kiss_fft_cfg cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout);
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/*
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A more generic version of the above function. It reads its input from every Nth sample.
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* */
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void kiss_fft_stride(kiss_fft_cfg cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout,int fin_stride);
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/* If kiss_fft_alloc allocated a buffer, it is one contiguous
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buffer and can be simply free()d when no longer needed*/
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#define kiss_fft_free speex_free
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/*
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Cleans up some memory that gets managed internally. Not necessary to call, but it might clean up
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your compiler output to call this before you exit.
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*/
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void kiss_fft_cleanup(void);
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#ifdef __cplusplus
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}
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#endif
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#endif
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