| Nanang Izzuddin | 3cbb065 | 2008-06-10 14:09:37 +0000 | [diff] [blame^] | 1 | /******************************************************************** |
| 2 | * * |
| 3 | * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * |
| 4 | * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
| 5 | * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
| 6 | * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
| 7 | * * |
| 8 | * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 * |
| 9 | * by the XIPHOPHORUS Company http://www.xiph.org/ * |
| 10 | * * |
| 11 | ******************************************************************** |
| 12 | |
| 13 | function: fft transform |
| 14 | last mod: $Id$ |
| 15 | |
| 16 | ********************************************************************/ |
| 17 | /** |
| 18 | @file smallft.h |
| 19 | @brief Discrete Rotational Fourier Transform (DRFT) |
| 20 | */ |
| 21 | |
| 22 | #ifndef _V_SMFT_H_ |
| 23 | #define _V_SMFT_H_ |
| 24 | |
| 25 | |
| 26 | #ifdef __cplusplus |
| 27 | extern "C" { |
| 28 | #endif |
| 29 | |
| 30 | /** Discrete Rotational Fourier Transform lookup */ |
| 31 | struct drft_lookup{ |
| 32 | int n; |
| 33 | float *trigcache; |
| 34 | int *splitcache; |
| 35 | }; |
| 36 | |
| 37 | extern void spx_drft_forward(struct drft_lookup *l,float *data); |
| 38 | extern void spx_drft_backward(struct drft_lookup *l,float *data); |
| 39 | extern void spx_drft_init(struct drft_lookup *l,int n); |
| 40 | extern void spx_drft_clear(struct drft_lookup *l); |
| 41 | |
| 42 | #ifdef __cplusplus |
| 43 | } |
| 44 | #endif |
| 45 | |
| 46 | #endif |