| Line | |
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| 1 | /******************************************************************** |
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| 2 | * * |
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| 3 | * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * |
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| 4 | * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
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| 5 | * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
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| 6 | * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
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| 7 | * * |
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| 8 | * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 * |
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| 9 | * by the Xiph.Org Foundation http://www.xiph.org/ * |
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| 10 | * * |
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| 11 | ******************************************************************** |
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| 12 | |
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| 13 | function: fft transform |
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| 14 | last mod: $Id: smallft.h 13293 2007-07-24 00:09:47Z xiphmont $ |
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| 15 | |
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| 16 | ********************************************************************/ |
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| 17 | |
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| 18 | #ifndef _V_SMFT_H_ |
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| 19 | #define _V_SMFT_H_ |
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| 20 | |
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| 21 | #include "vorbis/codec.h" |
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| 22 | |
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| 23 | typedef struct { |
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| 24 | int n; |
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| 25 | float *trigcache; |
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| 26 | int *splitcache; |
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| 27 | } drft_lookup; |
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| 28 | |
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| 29 | extern void drft_forward(drft_lookup *l,float *data); |
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| 30 | extern void drft_backward(drft_lookup *l,float *data); |
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| 31 | extern void drft_init(drft_lookup *l,int n); |
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| 32 | extern void drft_clear(drft_lookup *l); |
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| 33 | |
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| 34 | #endif |
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