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