ref: 56e71d5260182e2ac32e09767b7c9440048a1d2f
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