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smallft.h (1218B)

      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 https://xiph.org/                     *
     10 *                                                                  *
     11 ********************************************************************
     12 
     13 function: fft transform
     14 
     15 ********************************************************************/
     16 
     17 #ifndef _V_SMFT_H_
     18 #define _V_SMFT_H_
     19 
     20 #include "vorbis/codec.h"
     21 
     22 typedef struct {
     23  int n;
     24  float *trigcache;
     25  int *splitcache;
     26 } drft_lookup;
     27 
     28 extern void drft_forward(drft_lookup *l,float *data);
     29 extern void drft_backward(drft_lookup *l,float *data);
     30 extern void drft_init(drft_lookup *l,int n);
     31 extern void drft_clear(drft_lookup *l);
     32 
     33 #endif