shithub: aacenc

ref: 6a0f3c931e3a04b11086258bb4e58e2c0358727b
dir: /libfaac/psych.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: 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 */