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comparison: media/libvorbis/lib/smallft.h
media/libvorbis/lib/smallft.h
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| 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 |
