modules/libvorbis/lib/smallft.h
author Monty <monty@xiph.org> and the rest of the Xiph.Org Foundation, plus Chris Double <chris.double@double.co.nz>
Tue, 29 Jul 2008 23:34:34 -0700
changeset 16295 512b6f96960cc5ab36746bd627c502deefc2ee44
permissions -rw-r--r--
Bug 422538. Import libvorbis

/********************************************************************
 *                                                                  *
 * 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 http://www.xiph.org/                  *
 *                                                                  *
 ********************************************************************

 function: fft transform
 last mod: $Id: smallft.h 13293 2007-07-24 00:09:47Z xiphmont $

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

#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