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/********************************************************************
* *
* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
* by the XIPHOPHORUS Company http://www.xiph.org/ *
********************************************************************
function: PCM data envelope analysis and manipulation
last mod: $Id: envelope.h,v 1.16 2001/02/26 03:50:41 xiphmont Exp $
********************************************************************/
#ifndef _V_ENVELOPE_
#define _V_ENVELOPE_
#include "iir.h"
#include "smallft.h"
typedef struct {
int ch;
int winlength;
int searchstep;
float minenergy;
IIR_state *iir;
float **filtered;
long storage;
long current;
long lastmark;
} envelope_lookup;
extern void _ve_envelope_init(envelope_lookup *e,vorbis_info *vi);
extern void _ve_envelope_clear(envelope_lookup *e);
extern long _ve_envelope_search(vorbis_dsp_state *v,long searchpoint);
extern void _ve_envelope_shift(envelope_lookup *e,long shift);
#endif
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