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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 https://xiph.org/                     *
  10.  *                                                                  *
  11.  ********************************************************************
  12.  
  13.  function: PCM data envelope analysis and manipulation
  14.  
  15.  ********************************************************************/
  16.  
  17. #ifndef _V_ENVELOPE_
  18. #define _V_ENVELOPE_
  19.  
  20. #include "mdct.h"
  21.  
  22. #define VE_PRE    16
  23. #define VE_WIN    4
  24. #define VE_POST   2
  25. #define VE_AMP    (VE_PRE+VE_POST-1)
  26.  
  27. #define VE_BANDS  7
  28. #define VE_NEARDC 15
  29.  
  30. #define VE_MINSTRETCH 2   /* a bit less than short block */
  31. #define VE_MAXSTRETCH 12  /* one-third full block */
  32.  
  33. typedef struct {
  34.   float ampbuf[VE_AMP];
  35.   int   ampptr;
  36.  
  37.   float nearDC[VE_NEARDC];
  38.   float nearDC_acc;
  39.   float nearDC_partialacc;
  40.   int   nearptr;
  41.  
  42. } envelope_filter_state;
  43.  
  44. typedef struct {
  45.   int begin;
  46.   int end;
  47.   float *window;
  48.   float total;
  49. } envelope_band;
  50.  
  51. typedef struct {
  52.   int ch;
  53.   int winlength;
  54.   int searchstep;
  55.   float minenergy;
  56.  
  57.   mdct_lookup  mdct;
  58.   float       *mdct_win;
  59.  
  60.   envelope_band          band[VE_BANDS];
  61.   envelope_filter_state *filter;
  62.   int   stretch;
  63.  
  64.   int                   *mark;
  65.  
  66.   long storage;
  67.   long current;
  68.   long curmark;
  69.   long cursor;
  70. } envelope_lookup;
  71.  
  72. extern void _ve_envelope_init(envelope_lookup *e,vorbis_info *vi);
  73. extern void _ve_envelope_clear(envelope_lookup *e);
  74. extern long _ve_envelope_search(vorbis_dsp_state *v);
  75. extern void _ve_envelope_shift(envelope_lookup *e,long shift);
  76. extern int  _ve_envelope_mark(vorbis_dsp_state *v);
  77.  
  78.  
  79. #endif
  80.