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   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 1994-2009             *
   9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: random psychoacoustics (not including preecho)
  14  last mod: $Id: psy.h 16946 2010-03-03 16:12:40Z xiphmont $
  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_p;
  61   int normal_start;
  62   int normal_partition;
  63   double normal_thresh;
  64 } vorbis_info_psy;
  65
  66 typedef struct{
  67   int   eighth_octave_lines;
  68
  69   /* for block long/short tuning; encode only */
  70   float preecho_thresh[VE_BANDS];
  71   float postecho_thresh[VE_BANDS];
  72   float stretch_penalty;
  73   float preecho_minenergy;
  74
  75   float ampmax_att_per_sec;
  76
  77   /* channel coupling config */
  78   int   coupling_pkHz[PACKETBLOBS];
  79   int   coupling_pointlimit[2][PACKETBLOBS];
  80   int   coupling_prepointamp[PACKETBLOBS];
  81   int   coupling_postpointamp[PACKETBLOBS];
  82   int   sliding_lowpass[2][PACKETBLOBS];
  83
  84 } vorbis_info_psy_global;
  85
  86 typedef struct {
  87   float ampmax;
  88   int   channels;
  89
  90   vorbis_info_psy_global *gi;
  91   int   coupling_pointlimit[2][P_NOISECURVES];
  92 } vorbis_look_psy_global;
  93
  94
  95 typedef struct {
  96   int n;
  97   struct vorbis_info_psy *vi;
  98
  99   float ***tonecurves;
 100   float **noiseoffset;
 101
 102   float *ath;
 103   long  *octave;             /* in n.ocshift format */
 104   long  *bark;
 105
 106   long  firstoc;
 107   long  shiftoc;
 108   int   eighth_octave_lines; /* power of two, please */
 109   int   total_octave_lines;
 110   long  rate; /* cache it */
 111
 112   float m_val; /* Masking compensation value */
 113
 114 } vorbis_look_psy;
 115
 116 extern void   _vp_psy_init(vorbis_look_psy *p,vorbis_info_psy *vi,
 117                            vorbis_info_psy_global *gi,int n,long rate);
 118 extern void   _vp_psy_clear(vorbis_look_psy *p);
 119 extern void  *_vi_psy_dup(void *source);
 120
 121 extern void   _vi_psy_free(vorbis_info_psy *i);
 122 extern vorbis_info_psy *_vi_psy_copy(vorbis_info_psy *i);
 123
 124 extern void _vp_noisemask(vorbis_look_psy *p,
 125                           float *logmdct,
 126                           float *logmask);
 127
 128 extern void _vp_tonemask(vorbis_look_psy *p,
 129                          float *logfft,
 130                          float *logmask,
 131                          float global_specmax,
 132                          float local_specmax);
 133
 134 extern void _vp_offset_and_mix(vorbis_look_psy *p,
 135                                float *noise,
 136                                float *tone,
 137                                int offset_select,
 138                                float *logmask,
 139                                float *mdct,
 140                                float *logmdct);
 141
 142 extern float _vp_ampmax_decay(float amp,vorbis_dsp_state *vd);
 143
 144 extern void _vp_couple_quantize_normalize(int blobno,
 145                                           vorbis_info_psy_global *g,
 146                                           vorbis_look_psy *p,
 147                                           vorbis_info_mapping0 *vi,
 148                                           float **mdct,
 149                                           int   **iwork,
 150                                           int    *nonzero,
 151                                           int     sliding_lowpass,
 152                                           int     ch);
 153
 154 #endif