ref: a406642c783fc7d3bbbb1531f1e309e98008de96
dir: /libfaac/psych.h/
/*
* 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: psych.h,v 1.1 2001/01/17 11:21:40 menno Exp $
*/
#ifndef PSYCH_H
#define PSYCH_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#include "coder.h"
#include "channels.h"
typedef struct {
int size;
int sizeS;
/* Previous input samples */
double *prevSamples;
double *prevSamplesS;
/* FFT data */
/* Magnitude */
double *fftMagPlus2;
double *fftMagPlus1;
double *fftMag;
double *fftMagMin1;
double *fftMagMin2;
double *fftMagPlus2S[8];
double *fftMagPlus1S[8];
double *fftMagS[8];
double *fftMagMin1S[8];
/* Phase */
double *fftPhPlus2;
double *fftPhPlus1;
double *fftPh;
double *fftPhMin1;
double *fftPhMin2;
double *fftPhPlus2S[8];
double *fftPhPlus1S[8];
double *fftPhS[8];
double *fftPhMin1S[8];
/* Unpredictability */
double *cw;
double *cwS[8];
double lastPe;
double lastEnr;
int threeInARow;
int block_type;
/* Final threshold values */
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 *hannWindow;
double *hannWindowS;
/* Stereo demasking thresholds */
double *mld;
double *mldS;
/* Spreading functions */
double spreading[MAX_SCFAC_BANDS][MAX_SCFAC_BANDS];
double spreadingS[MAX_SCFAC_BANDS][MAX_SCFAC_BANDS];
double *rnorm;
double *rnormS;
/* Absolute threshold of hearing */
double *ath;
double *athS;
} GlobalPsyInfo;
void PsyInit(GlobalPsyInfo *gpsyInfo, PsyInfo *psyInfo, unsigned int numChannels,
unsigned int sampleRate, int *cb_width_long, int num_cb_long,
int *cb_width_short, int num_cb_short);
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 BlockSwitch(CoderInfo *coderInfo, PsyInfo *psyInfo, unsigned int numChannels);
static void Hann(GlobalPsyInfo *gpsyInfo, double *inSamples, int N);
static void PsyUnpredictability(PsyInfo *psyInfo);
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 */