ref: 8b6936294846c08a320e4dc9a95d2810068e1a33
dir: /libfaac/psych.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: psych.h,v 1.8 2001/06/08 18:01:09 menno Exp $
*/
#ifndef PSYCH_H
#define PSYCH_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#include "coder.h"
#include "channels.h"
#define NPART_LONG 72
#define NPART_SHORT 48
#define MAX_NPART NPART_LONG
typedef struct {
int sampling_rate;
int len;
unsigned char width[MAX_NPART];
} PsyPartTable;
static PsyPartTable psyPartTableLong[12+1];
static PsyPartTable psyPartTableShort[12+1];
typedef struct {
int size;
int sizeS;
/* Previous input samples */
double *prevSamples;
double *prevSamplesS;
/* FFT data */
/* Magnitude */
double *energy;
double *energyS[8];
double *energyMS;
double *energySMS[8];
double *transBuff;
double *transBuffS[8];
/* Tonality */
double *tonality;
double lastPe;
double lastEnr;
int threeInARow;
int block_type;
/* Final threshold values */
double pe;
double *nb;
double *nbS[8];
double *maskThr;
double *maskEn;
double *maskThrS[8];
double *maskEnS[8];
double *maskThrNext;
double *maskEnNext;
double *maskThrNextS[8];
double *maskEnNextS[8];
double *lastNb;
double *lastNbMS;
double *maskThrMS;
double *maskEnMS;
double *maskThrSMS[8];
double *maskEnSMS[8];
double *maskThrNextMS;
double *maskEnNextMS;
double *maskThrNextSMS[8];
double *maskEnNextSMS[8];
} PsyInfo;
typedef struct {
double sampleRate;
/* Hann window */
double *window;
double *windowS;
/* Stereo demasking thresholds */
double *mld;
double *mldS;
PsyPartTable *psyPart;
PsyPartTable *psyPartS;
/* Spreading functions */
double spreading[NPART_LONG][NPART_LONG];
double spreadingS[NPART_SHORT][NPART_SHORT];
int sprInd[NPART_LONG][2];
int sprIndS[NPART_SHORT][2];
/* Absolute threshold of hearing */
double *ath;
double *athS;
} GlobalPsyInfo;
void PsyInit(GlobalPsyInfo *gpsyInfo, PsyInfo *psyInfo, unsigned int numChannels,
unsigned int sampleRate, unsigned int sampleRateIdx);
void PsyEnd(GlobalPsyInfo *gpsyInfo, PsyInfo *psyInfo, unsigned int numChannels);
void PsyCalculate(ChannelInfo *channelInfo, GlobalPsyInfo *gpsyInfo, PsyInfo *psyInfo,
int *cb_width_long, int num_cb_long, int *cb_width_short,
int num_cb_short, unsigned int numChannels);
void PsyBufferUpdate(GlobalPsyInfo *gpsyInfo, PsyInfo *psyInfo, double *newSamples);
void PsyBufferUpdateMS(GlobalPsyInfo *gpsyInfo, PsyInfo *psyInfoL, PsyInfo *psyInfoR);
void BlockSwitch(CoderInfo *coderInfo, PsyInfo *psyInfo, unsigned int numChannels);
static void Hann(GlobalPsyInfo *gpsyInfo, double *inSamples, int N);
__inline double mask_add(double m1, double m2, int k, int b, double *ath);
static void PsyThreshold(GlobalPsyInfo *gpsyInfo, PsyInfo *psyInfo, int *cb_width_long,
int num_cb_long, int *cb_width_short, int num_cb_short);
static void PsyThresholdMS(ChannelInfo *channelInfoL, GlobalPsyInfo *gpsyInfo,
PsyInfo *psyInfoL, PsyInfo *psyInfoR, int *cb_width_long,
int num_cb_long, int *cb_width_short, int num_cb_short);
static double freq2bark(double freq);
static double ATHformula(double f);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* PSYCH_H */