shithub: aacenc

ref: 67b4f27683c75a5249eb4b25c025779dc389f2a1
dir: /libfaac/filtbank.h/

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/*
 * FAAC - Freeware Advanced Audio Coder
 * Copyright (C) 2001 Menno 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 of the License, 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; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id: filtbank.h,v 1.4 2001/02/25 18:41:16 menno Exp $
 */

#ifndef FILTBANK_H
#define FILTBANK_H

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#include "frame.h"

#define NFLAT_LS 448

#ifndef M_PI
#define M_PI        3.14159265358979323846
#endif

#ifndef M_PI_2
#define M_PI_2      1.57079632679489661923
#endif


#define SINE_WINDOW 0
#define KBD_WINDOW  1

void FilterBankInit(faacEncHandle hEncoder);

void FilterBankEnd(faacEncHandle hEncoder);

void FilterBank(faacEncHandle hEncoder,
				CoderInfo *coderInfo,
				double *p_in_data,
				double *p_out_mdct,
				double *p_overlap);

void specFilter(double *freqBuff,
				int sampleRate,
				int lowpassFreq,
				int specLen
				);

static void CalculateKBDWindow(double* win, double alpha, int length);
static double Izero(double x);
static void MDCT(double *data, int N);
static void IMDCT(double *data, int N);


#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* FILTBANK_H */