nuclear@0: /********************************************************************
nuclear@0:  *                                                                  *
nuclear@0:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
nuclear@0:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
nuclear@0:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
nuclear@0:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
nuclear@0:  *                                                                  *
nuclear@0:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
nuclear@0:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
nuclear@0:  *                                                                  *
nuclear@0:  ********************************************************************
nuclear@0: 
nuclear@0:  function: PCM data envelope analysis and manipulation
nuclear@0:  last mod: $Id: envelope.h 16227 2009-07-08 06:58:46Z xiphmont $
nuclear@0: 
nuclear@0:  ********************************************************************/
nuclear@0: 
nuclear@0: #ifndef _V_ENVELOPE_
nuclear@0: #define _V_ENVELOPE_
nuclear@0: 
nuclear@0: #include "mdct.h"
nuclear@0: 
nuclear@0: #define VE_PRE    16
nuclear@0: #define VE_WIN    4
nuclear@0: #define VE_POST   2
nuclear@0: #define VE_AMP    (VE_PRE+VE_POST-1)
nuclear@0: 
nuclear@0: #define VE_BANDS  7
nuclear@0: #define VE_NEARDC 15
nuclear@0: 
nuclear@0: #define VE_MINSTRETCH 2   /* a bit less than short block */
nuclear@0: #define VE_MAXSTRETCH 12  /* one-third full block */
nuclear@0: 
nuclear@0: typedef struct {
nuclear@0:   float ampbuf[VE_AMP];
nuclear@0:   int   ampptr;
nuclear@0: 
nuclear@0:   float nearDC[VE_NEARDC];
nuclear@0:   float nearDC_acc;
nuclear@0:   float nearDC_partialacc;
nuclear@0:   int   nearptr;
nuclear@0: 
nuclear@0: } envelope_filter_state;
nuclear@0: 
nuclear@0: typedef struct {
nuclear@0:   int begin;
nuclear@0:   int end;
nuclear@0:   float *window;
nuclear@0:   float total;
nuclear@0: } envelope_band;
nuclear@0: 
nuclear@0: typedef struct {
nuclear@0:   int ch;
nuclear@0:   int winlength;
nuclear@0:   int searchstep;
nuclear@0:   float minenergy;
nuclear@0: 
nuclear@0:   mdct_lookup  mdct;
nuclear@0:   float       *mdct_win;
nuclear@0: 
nuclear@0:   envelope_band          band[VE_BANDS];
nuclear@0:   envelope_filter_state *filter;
nuclear@0:   int   stretch;
nuclear@0: 
nuclear@0:   int                   *mark;
nuclear@0: 
nuclear@0:   long storage;
nuclear@0:   long current;
nuclear@0:   long curmark;
nuclear@0:   long cursor;
nuclear@0: } envelope_lookup;
nuclear@0: 
nuclear@0: extern void _ve_envelope_init(envelope_lookup *e,vorbis_info *vi);
nuclear@0: extern void _ve_envelope_clear(envelope_lookup *e);
nuclear@0: extern long _ve_envelope_search(vorbis_dsp_state *v);
nuclear@0: extern void _ve_envelope_shift(envelope_lookup *e,long shift);
nuclear@0: extern int  _ve_envelope_mark(vorbis_dsp_state *v);
nuclear@0: 
nuclear@0: 
nuclear@0: #endif