81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
/********************************************************************
|
|
* *
|
|
* 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 1994-2009 *
|
|
* by the Xiph.Org Foundation http://www.xiph.org/ *
|
|
* *
|
|
********************************************************************
|
|
|
|
function: PCM data envelope analysis and manipulation
|
|
last mod: $Id: envelope.h 16227 2009-07-08 06:58:46Z xiphmont $
|
|
|
|
********************************************************************/
|
|
|
|
#ifndef _V_ENVELOPE_
|
|
#define _V_ENVELOPE_
|
|
|
|
#include "mdct.h"
|
|
|
|
#define VE_PRE 16
|
|
#define VE_WIN 4
|
|
#define VE_POST 2
|
|
#define VE_AMP (VE_PRE+VE_POST-1)
|
|
|
|
#define VE_BANDS 7
|
|
#define VE_NEARDC 15
|
|
|
|
#define VE_MINSTRETCH 2 /* a bit less than short block */
|
|
#define VE_MAXSTRETCH 12 /* one-third full block */
|
|
|
|
typedef struct {
|
|
float ampbuf[VE_AMP];
|
|
int ampptr;
|
|
|
|
float nearDC[VE_NEARDC];
|
|
float nearDC_acc;
|
|
float nearDC_partialacc;
|
|
int nearptr;
|
|
|
|
} envelope_filter_state;
|
|
|
|
typedef struct {
|
|
int begin;
|
|
int end;
|
|
float *window;
|
|
float total;
|
|
} envelope_band;
|
|
|
|
typedef struct {
|
|
int ch;
|
|
int winlength;
|
|
int searchstep;
|
|
float minenergy;
|
|
|
|
mdct_lookup mdct;
|
|
float *mdct_win;
|
|
|
|
envelope_band band[VE_BANDS];
|
|
envelope_filter_state *filter;
|
|
int stretch;
|
|
|
|
int *mark;
|
|
|
|
long storage;
|
|
long current;
|
|
long curmark;
|
|
long cursor;
|
|
} 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);
|
|
extern void _ve_envelope_shift(envelope_lookup *e,long shift);
|
|
extern int _ve_envelope_mark(vorbis_dsp_state *v);
|
|
|
|
|
|
#endif
|