fft.h

evc编写的wave文件波形播放

/*
 * FAAC - Freeware Advanced Audio Coder
 * $Id: fft.h,v 1.3 2002/08/21 16:52:52 knik Exp $
 * Copyright (C) 2002 Krzysztof Nikiel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef _FFT_H_
#define _FFT_H_

#ifndef M_PI
#define M_PI    3.14159265358979323846
#endif

#ifndef AllocMemory
#define AllocMemory(x)	malloc((x))
#endif

#ifndef FreeMemory
#define FreeMemory(ptr)	free((ptr))
#endif

#ifndef __cplusplus
extern "C"
{
#endif

void rfft(double *x, int logm);
void fft(double *xr, double *xi, int logm);
void ffti(double *xr, double *xi, int logm);

#ifndef __cplusplus
}
#endif

#endif