shithub: riscv

ref: 19b480838af1721b833f6cd7575e994a5d55071d
dir: /sys/src/cmd/audio/libvorbis/smallft.h/

/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
 *                                                                  *
 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
 * by the Xiph.Org Foundation https://xiph.org/                     *
 *                                                                  *
 ********************************************************************

 function: fft transform

 ********************************************************************/

#ifndef _V_SMFT_H_
#define _V_SMFT_H_

#include "vorbis/codec.h"

typedef struct {
  int n;
  float *trigcache;
  int *splitcache;
} drft_lookup;

extern void drft_forward(drft_lookup *l,float *data);
extern void drft_backward(drft_lookup *l,float *data);
extern void drft_init(drft_lookup *l,int n);
extern void drft_clear(drft_lookup *l);

#endif