47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
|
/********************************************************************
|
||
|
|
* *
|
||
|
|
* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
|
||
|
|
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
|
||
|
|
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
|
||
|
|
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
|
||
|
|
* *
|
||
|
|
* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
|
||
|
|
* by the XIPHOPHORUS Company http://www.xiph.org/ *
|
||
|
|
* *
|
||
|
|
********************************************************************
|
||
|
|
|
||
|
|
function: fft transform
|
||
|
|
last mod: $Id: smallft.h,v 1.3 2003/09/16 18:35:45 jm Exp $
|
||
|
|
|
||
|
|
********************************************************************/
|
||
|
|
/**
|
||
|
|
@file smallft.h
|
||
|
|
@brief Discrete Rotational Fourier Transform (DRFT)
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _V_SMFT_H_
|
||
|
|
#define _V_SMFT_H_
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/** Discrete Rotational Fourier Transform lookup */
|
||
|
|
struct drft_lookup{
|
||
|
|
int n;
|
||
|
|
float *trigcache;
|
||
|
|
int *splitcache;
|
||
|
|
};
|
||
|
|
|
||
|
|
extern void spx_drft_forward(struct drft_lookup *l,float *data);
|
||
|
|
extern void spx_drft_backward(struct drft_lookup *l,float *data);
|
||
|
|
extern void spx_drft_init(struct drft_lookup *l,int n);
|
||
|
|
extern void spx_drft_clear(struct drft_lookup *l);
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|