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 1994-2007 * 9 * by the Xiph.Org Foundation http://www.xiph.org/ * 10 * * 11 ******************************************************************** 12 13 function: fft transform 14 last mod: $Id: smallft.h 13293 2007-07-24 00:09:47Z xiphmont $ 15 16 ********************************************************************/ 17 18 #ifndef _V_SMFT_H_ 19 #define _V_SMFT_H_ 20 21 #include "vorbis/codec.h" 22 23 typedef struct { 24 int n; 25 float *trigcache; 26 int *splitcache; 27 } drft_lookup; 28 29 extern void drft_forward(drft_lookup *l,float *data); 30 extern void drft_backward(drft_lookup *l,float *data); 31 extern void drft_init(drft_lookup *l,int n); 32 extern void drft_clear(drft_lookup *l); 33 34 #endif 35
