ref: 3a77c01f43821dcc4f7cae54aff89bb20f2d95a5
dir: /sys/src/cmd/audio/libvorbis/psy.h/
/********************************************************************
* *
* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function: random psychoacoustics (not including preecho)
last mod: $Id: psy.h 16946 2010-03-03 16:12:40Z xiphmont $
********************************************************************/
#ifndef _V_PSY_H_
#define _V_PSY_H_
#include "smallft.h"
#include "backends.h"
#include "envelope.h"
#ifndef EHMER_MAX
#define EHMER_MAX 56
#endif
/* psychoacoustic setup ********************************************/
#define P_BANDS 17 /* 62Hz to 16kHz */
#define P_LEVELS 8 /* 30dB to 100dB */
#define P_LEVEL_0 30. /* 30 dB */
#define P_NOISECURVES 3
#define NOISE_COMPAND_LEVELS 40
typedef struct vorbis_info_psy{
int blockflag;
float ath_adjatt;
float ath_maxatt;
float tone_masteratt[P_NOISECURVES];
float tone_centerboost;
float tone_decay;
float tone_abs_limit;
float toneatt[P_BANDS];
int noisemaskp;
float noisemaxsupp;
float noisewindowlo;
float noisewindowhi;
int noisewindowlomin;
int noisewindowhimin;
int noisewindowfixed;
float noiseoff[P_NOISECURVES][P_BANDS];
float noisecompand[NOISE_COMPAND_LEVELS];
float max_curve_dB;
int normal_p;
int normal_start;
int normal_partition;
double normal_thresh;
} vorbis_info_psy;
typedef struct{
int eighth_octave_lines;
/* for block long/short tuning; encode only */
float preecho_thresh[VE_BANDS];
float postecho_thresh[VE_BANDS];
float stretch_penalty;
float preecho_minenergy;
float ampmax_att_per_sec;
/* channel coupling config */
int coupling_pkHz[PACKETBLOBS];
int coupling_pointlimit[2][PACKETBLOBS];
int coupling_prepointamp[PACKETBLOBS];
int coupling_postpointamp[PACKETBLOBS];
int sliding_lowpass[2][PACKETBLOBS];
} vorbis_info_psy_global;
typedef struct {
float ampmax;
int channels;
vorbis_info_psy_global *gi;
int coupling_pointlimit[2][P_NOISECURVES];
} vorbis_look_psy_global;
typedef struct {
int n;
struct vorbis_info_psy *vi;
float ***tonecurves;
float **noiseoffset;
float *ath;
long *octave; /* in n.ocshift format */
long *bark;
long firstoc;
long shiftoc;
int eighth_octave_lines; /* power of two, please */
int total_octave_lines;
long rate; /* cache it */
float m_val; /* Masking compensation value */
} vorbis_look_psy;
extern void _vp_psy_init(vorbis_look_psy *p,vorbis_info_psy *vi,
vorbis_info_psy_global *gi,int n,long rate);
extern void _vp_psy_clear(vorbis_look_psy *p);
extern void *_vi_psy_dup(void *source);
extern void _vi_psy_free(vorbis_info_psy *i);
extern vorbis_info_psy *_vi_psy_copy(vorbis_info_psy *i);
extern void _vp_noisemask(vorbis_look_psy *p,
float *logmdct,
float *logmask);
extern void _vp_tonemask(vorbis_look_psy *p,
float *logfft,
float *logmask,
float global_specmax,
float local_specmax);
extern void _vp_offset_and_mix(vorbis_look_psy *p,
float *noise,
float *tone,
int offset_select,
float *logmask,
float *mdct,
float *logmdct);
extern float _vp_ampmax_decay(float amp,vorbis_dsp_state *vd);
extern void _vp_couple_quantize_normalize(int blobno,
vorbis_info_psy_global *g,
vorbis_look_psy *p,
vorbis_info_mapping0 *vi,
float **mdct,
int **iwork,
int *nonzero,
int sliding_lowpass,
int ch);
#endif