ref: 8b6936294846c08a320e4dc9a95d2810068e1a33
dir: /libfaac/tns.h/
/*
* 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: tns.h,v 1.3 2001/06/08 18:01:09 menno Exp $
*/
#ifndef TNS_H
#define TNS_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/*************************/
/* Function prototypes */
/*************************/
static void Autocorrelation(int maxOrder, /* Maximum autocorr order */
int dataSize, /* Size of the data array */
double* data, /* Data array */
double* rArray); /* Autocorrelation array */
static double LevinsonDurbin(int maxOrder, /* Maximum filter order */
int dataSize, /* Size of the data array */
double* data, /* Data array */
double* kArray); /* Reflection coeff array */
static void StepUp(int fOrder, double* kArray, double* aArray);
static void QuantizeReflectionCoeffs(int fOrder,int coeffRes,double* rArray,int* indexArray);
static int TruncateCoeffs(int fOrder,double threshold,double* kArray);
static void TnsFilter(int length,double* spec,TnsFilterData* filter);
static void TnsInvFilter(int length,double* spec,TnsFilterData* filter);
void TnsInit(faacEncHandle hEncoder);
void TnsEncode(TnsInfo* tnsInfo, int numberOfBands,int maxSfb,enum WINDOW_TYPE blockType,
int* sfbOffsetTable,double* spec);
void TnsEncodeFilterOnly(TnsInfo* tnsInfo, int numberOfBands, int maxSfb,
enum WINDOW_TYPE blockType, int *sfbOffsetTable, double *spec);
void TnsDecodeFilterOnly(TnsInfo* tnsInfo, int numberOfBands, int maxSfb,
enum WINDOW_TYPE blockType, int *sfbOffsetTable, double *spec);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* TNS_H */