libvorbis-1.0.1/lib/psy.h

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002             *
   9  * by the XIPHOPHORUS Company http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: random psychoacoustics (not including preecho)
  14  last mod: $Id: psy.h,v 1.32 2002/07/13 06:12:47 xiphmont Exp $
  15
  16  ********************************************************************/
  17
  18 #ifndef _V_PSY_H_
  19 #define _V_PSY_H_
  20 #include "smallft.h"
  21
  22 #include "backends.h"
  23 #include "envelope.h"
  24
  25 #ifndef EHMER_MAX
  26 #define EHMER_MAX 56
  27 #endif
  28
  29 /* psychoacoustic setup ********************************************/
  30 #define P_BANDS 17      /* 62Hz to 16kHz */
  31 #define P_LEVELS 8      /* 30dB to 100dB */
  32 #define P_LEVEL_0 30.    /* 30 dB */
  33 #define P_NOISECURVES 3
  34
  35 #define NOISE_COMPAND_LEVELS 40
  36 typedef struct vorbis_info_psy{
  37   int   blockflag;
  38
  39   float ath_adjatt;
  40   float ath_maxatt;
  41
  42   float tone_masteratt[P_NOISECURVES];
  43   float tone_centerboost;
  44   float tone_decay;
  45   float tone_abs_limit;
  46   float toneatt[P_BANDS];
  47
  48   int noisemaskp;
  49   float noisemaxsupp;
  50   float noisewindowlo;
  51   float noisewindowhi;
  52   int   noisewindowlomin;
  53   int   noisewindowhimin;
  54   int   noisewindowfixed;
  55   float noiseoff[P_NOISECURVES][P_BANDS];
  56   float noisecompand[NOISE_COMPAND_LEVELS];
  57
  58   float max_curve_dB;
  59
  60   int normal_channel_p;
  61   int normal_point_p;
  62   int normal_start;
  63   int normal_partition;
  64   double normal_thresh;
  65 } vorbis_info_psy;
  66
  67 typedef struct{
  68   int   eighth_octave_lines;
  69
  70   /* for block long/short tuning; encode only */
  71   float preecho_thresh[VE_BANDS];
  72   float postecho_thresh[VE_BANDS];
  73   float stretch_penalty;
  74   float preecho_minenergy;
  75
  76   float ampmax_att_per_sec;
  77
  78   /* channel coupling config */
  79   int   coupling_pkHz[PACKETBLOBS];
  80   int   coupling_pointlimit[2][PACKETBLOBS];
  81   int   coupling_prepointamp[PACKETBLOBS];
  82   int   coupling_postpointamp[PACKETBLOBS];
  83   int   sliding_lowpass[2][PACKETBLOBS];
  84
  85 } vorbis_info_psy_global;
  86
  87 typedef struct {
  88   float ampmax;
  89   int   channels;
  90
  91   vorbis_info_psy_global *gi;
  92   int   coupling_pointlimit[2][P_NOISECURVES];
  93 } vorbis_look_psy_global;
  94
  95
  96 typedef struct {
  97   int n;
  98   struct vorbis_info_psy *vi;
  99
 100   float ***tonecurves;
 101   float **noiseoffset;
 102
 103   float *ath;
 104   long  *octave;             /* in n.ocshift format */
 105   long  *bark;
 106
 107   long  firstoc;
 108   long  shiftoc;
 109   int   eighth_octave_lines; /* power of two, please */
 110   int   total_octave_lines;
 111   long  rate; /* cache it */
 112 } vorbis_look_psy;
 113
 114 extern void   _vp_psy_init(vorbis_look_psy *p,vorbis_info_psy *vi,
 115                            vorbis_info_psy_global *gi,int n,long rate);
 116 extern void   _vp_psy_clear(vorbis_look_psy *p);
 117 extern void  *_vi_psy_dup(void *source);
 118
 119 extern void   _vi_psy_free(vorbis_info_psy *i);
 120 extern vorbis_info_psy *_vi_psy_copy(vorbis_info_psy *i);
 121
 122 extern void _vp_remove_floor(vorbis_look_psy *p,
 123                              float *mdct,
 124                              int *icodedflr,
 125                              float *residue,
 126                              int sliding_lowpass);
 127
 128 extern void _vp_noisemask(vorbis_look_psy *p,
 129                           float *logmdct,
 130                           float *logmask);
 131
 132 extern void _vp_tonemask(vorbis_look_psy *p,
 133                          float *logfft,
 134                          float *logmask,
 135                          float global_specmax,
 136                          float local_specmax);
 137
 138 extern void _vp_offset_and_mix(vorbis_look_psy *p,
 139                                float *noise,
 140                                float *tone,
 141                                int offset_select,
 142                                float *logmask);
 143
 144 extern float _vp_ampmax_decay(float amp,vorbis_dsp_state *vd);
 145
 146 extern float **_vp_quantize_couple_memo(vorbis_block *vb,
 147                                         vorbis_info_psy_global *g,
 148                                         vorbis_look_psy *p,
 149                                         vorbis_info_mapping0 *vi,
 150                                         float **mdct);
 151
 152 extern void _vp_couple(int blobno,
 153                        vorbis_info_psy_global *g,
 154                        vorbis_look_psy *p,
 155                        vorbis_info_mapping0 *vi,
 156                        float **res,
 157                        float **mag_memo,
 158                        int   **mag_sort,
 159                        int   **ifloor,
 160                        int   *nonzero,
 161                        int   sliding_lowpass);
 162
 163 extern void _vp_noise_normalize(vorbis_look_psy *p,
 164                                 float *in,float *out,int *sortedindex);
 165
 166 extern void _vp_noise_normalize_sort(vorbis_look_psy *p,
 167                                      float *magnitudes,int *sortedindex);
 168
 169 extern int **_vp_quantize_couple_sort(vorbis_block *vb,
 170                                       vorbis_look_psy *p,
 171                                       vorbis_info_mapping0 *vi,
 172                                       float **mags);
 173
 174 #endif
 175