1 /********************************************************************
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
5 * THE GNU LESSER/LIBRARY PUBLIC LICENSE, WHICH IS INCLUDED WITH *
6 * THIS SOURCE. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2000 *
9 * by Monty <monty@xiph.org> and the XIPHOPHORUS Company *
10 * http://www.xiph.org/ *
12 ********************************************************************
14 function: random psychoacoustics (not including preecho)
15 last mod: $Id: psy.h,v 1.17 2001/01/22 01:38:25 xiphmont Exp $
17 ********************************************************************/
27 /* psychoacoustic setup ********************************************/
31 typedef struct vorbis_info_psy{
38 int eighth_octave_lines;
40 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 */
41 /* x: 63 88 125 175 250 350 500 700 1k 1.4k 2k 2.8k 4k 5.6k 8k 11.5k 16k Hz */
42 /* y: 0 10 20 30 40 50 60 70 80 90 100 dB */
45 float toneatt[P_BANDS][P_LEVELS];
48 float peakatt[P_BANDS][P_LEVELS];
56 float noisemedian[P_BANDS*2];
68 struct vorbis_info_psy *vi;
76 long *octave; /* in n.ocshift format */
81 int eighth_octave_lines; /* power of two, please */
82 int total_octave_lines;
86 extern void _vp_psy_init(vorbis_look_psy *p,vorbis_info_psy *vi,int n,long rate);
87 extern void _vp_psy_clear(vorbis_look_psy *p);
88 extern void *_vi_psy_dup(void *source);
90 extern void _vi_psy_free(vorbis_info_psy *i);
91 extern vorbis_info_psy *_vi_psy_copy(vorbis_info_psy *i);
93 extern float _vp_compute_mask(vorbis_look_psy *p,
99 extern void _vp_apply_floor(vorbis_look_psy *p,float *f,float *flr);
100 extern float _vp_ampmax_decay(float amp,vorbis_dsp_state *vd);