ref: 7edc234f6ddb73047ee23397aa52b2e5af2471bc
dir: /tns.h/
/*
* Function prototypes for TNS
*
* 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: 1.8 $
$Date: 2000/11/01 14:05:32 $ (check in)
$Author: menno $
*************************************************************************/
#ifndef _TNS_H_INCLUDED
#define _TNS_H_INCLUDED
#include "interface.h"
/*************************/
/* #defines */
/*************************/
#define TNS_MAX_ORDER 20
#define DEF_TNS_GAIN_THRESH 1.4 //new2
#define DEF_TNS_COEFF_THRESH 0.1
#define DEF_TNS_COEFF_RES 4
#define DEF_TNS_RES_OFFSET 3
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#ifndef min
#define min(a,b) ( (a) < (b) ? (a) : (b) )
#endif
#ifndef max
#define max(a,b) ( (a) > (b) ? (a) : (b) )
#endif
/**************************/
/* Structure definitions */
/**************************/
typedef struct {
int order; /* Filter order */
int direction; /* Filtering direction */
int coefCompress; /* Are coeffs compressed? */
int length; /* Length, in bands */
double aCoeffs[TNS_MAX_ORDER+1]; /* AR Coefficients */
double kCoeffs[TNS_MAX_ORDER+1]; /* Reflection Coefficients */
int index[TNS_MAX_ORDER+1]; /* Coefficient indices */
} TNS_FILTER_DATA;
typedef struct {
int numFilters; /* Number of filters */
int coefResolution; /* Coefficient resolution */
TNS_FILTER_DATA tnsFilter[1<<LEN_TNS_NFILTL]; /* TNS filters */
} TNS_WINDOW_DATA;
typedef struct {
int tnsDataPresent;
int tnsMinBandNumberLong;
int tnsMinBandNumberShort;
int tnsMaxBandsLong;
int tnsMaxBandsShort;
int tnsMaxOrderLong;
int tnsMaxOrderShort;
TNS_WINDOW_DATA windowData[MAX_SHORT_WINDOWS]; /* TNS data per window */
} TNS_INFO;
/*************************/
/* Function prototypes */
/*************************/
void Autocorrelation(int maxOrder, /* Maximum autocorr order */
int dataSize, /* Size of the data array */
double* data, /* Data array */
double* rArray); /* Autocorrelation array */
double LevinsonDurbin(int maxOrder, /* Maximum filter order */
int dataSize, /* Size of the data array */
double* data, /* Data array */
double* kArray); /* Reflection coeff array */
void StepUp(int fOrder,
double* kArray,
double* aArray);
void QuantizeReflectionCoeffs(int fOrder,int coeffRes,double* rArray,int* indexArray);
int TruncateCoeffs(int fOrder,double threshold,double* kArray);
void TnsFilter(int length,double* spec,TNS_FILTER_DATA* filter);
int TnsInvFilter(int length,double* spec,TNS_FILTER_DATA* filter);
void TnsInit(long samplingRate,enum AAC_PROFILE profile,TNS_INFO* tnsInfo);
int TnsEncode(struct _AACQuantInfo *quantInfo,int numberOfBands,enum WINDOW_TYPE blockType,int* sfbOffsetTable,double* spec,int use_tns);
#endif