ref: 7edc234f6ddb73047ee23397aa52b2e5af2471bc
dir: /transfo.h/
/*
* Function prototypes for MDCT transform
*
* Copyright (c) 1999 M. Bakker
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/**************************************************************************
Version Control Information Method: CVS
Identifiers:
$Revision: 1.11 $
$Date: 2000/10/05 13:04:05 $ (check in)
$Author: menno $
*************************************************************************/
#ifndef TRANSFORM_H
#define TRANSFORM_H
#include "interface.h"
void freq2buffer(
double p_in_data[],
double p_out_data[],
double p_overlap[],
enum WINDOW_TYPE block_type,
Window_shape wfun_select,
Window_shape wfun_select_prev,
Mdct_in overlap_select
);
void buffer2freq(
double p_in_data[],
double p_out_mdct[],
double p_overlap[],
enum WINDOW_TYPE block_type,
Window_shape wfun_select,
Window_shape wfun_select_prev,
Mdct_in overlap_select
);
void specFilter (double p_in[],
double p_out[],
int samp_rate,
int lowpass_freq,
int specLen
);
// Use this for decoder - single precision
//typedef float fftw_real;
// Use this for encoder - double precision
typedef double fftw_real;
typedef struct {
fftw_real re, im;
} fftw_complex;
#define c_re(c) ((c).re)
#define c_im(c) ((c).im)
#define DEFINE_PFFTW(size) \
void pfftwi_##size(fftw_complex *input); \
void pfftw_##size(fftw_complex *input); \
int pfftw_permutation_##size(int i);
DEFINE_PFFTW(16)
DEFINE_PFFTW(32)
DEFINE_PFFTW(64)
DEFINE_PFFTW(128)
DEFINE_PFFTW(256)
DEFINE_PFFTW(512)
DEFINE_PFFTW(1024)
void make_FFT_order(void);
void make_MDCT_windows(void);
void IMDCT(fftw_real *data, int N);
void MDCT(fftw_real *data, int N);
void realft2048(double *data);
void realft256(double *data);
void initrft(void);
extern int unscambled64[64]; /* the permutation array for FFT64*/
extern int unscambled128[128]; /* the permutation array for FFT128*/
extern int unscambled512[512]; /* the permutation array for FFT512*/
extern int unscambled1024[1024]; /* the permutation array for FFT1024*/
extern fftw_complex FFTarray[1024]; /* the array for in-place FFT */
#endif /* TRANSFORM_H */