shithub: aacenc

ref: 47faef7a1d0b5f55a876166b2fc2ded00309e352
dir: /libfaac/filtbank.h/

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/*
 * FAAC - Freeware Advanced Audio Coder
 * Copyright (C) 2001 Menno Bakker
 *
 * 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
 *
 * $Id: filtbank.h,v 1.8 2001/06/08 18:01:09 menno Exp $
 */

#ifndef FILTBANK_H
#define FILTBANK_H

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

#include "frame.h"

#define NFLAT_LS 448


#define MOVERLAPPED     0
#define MNON_OVERLAPPED 1


#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,
                int overlap_select);

void IFilterBank(faacEncHandle hEncoder,
                 CoderInfo *coderInfo,
                 double *p_in_data,
                 double *p_out_mdct,
                 double *p_overlap,
                 int overlap_select);

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 */