vrshoot

annotate libs/vorbis/envelope.h @ 2:334d17aed7de

visual studio project files
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 18:36:38 +0200
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nuclear@0 1 /********************************************************************
nuclear@0 2 * *
nuclear@0 3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
nuclear@0 4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
nuclear@0 5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
nuclear@0 6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
nuclear@0 7 * *
nuclear@0 8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
nuclear@0 9 * by the Xiph.Org Foundation http://www.xiph.org/ *
nuclear@0 10 * *
nuclear@0 11 ********************************************************************
nuclear@0 12
nuclear@0 13 function: PCM data envelope analysis and manipulation
nuclear@0 14 last mod: $Id: envelope.h 16227 2009-07-08 06:58:46Z xiphmont $
nuclear@0 15
nuclear@0 16 ********************************************************************/
nuclear@0 17
nuclear@0 18 #ifndef _V_ENVELOPE_
nuclear@0 19 #define _V_ENVELOPE_
nuclear@0 20
nuclear@0 21 #include "mdct.h"
nuclear@0 22
nuclear@0 23 #define VE_PRE 16
nuclear@0 24 #define VE_WIN 4
nuclear@0 25 #define VE_POST 2
nuclear@0 26 #define VE_AMP (VE_PRE+VE_POST-1)
nuclear@0 27
nuclear@0 28 #define VE_BANDS 7
nuclear@0 29 #define VE_NEARDC 15
nuclear@0 30
nuclear@0 31 #define VE_MINSTRETCH 2 /* a bit less than short block */
nuclear@0 32 #define VE_MAXSTRETCH 12 /* one-third full block */
nuclear@0 33
nuclear@0 34 typedef struct {
nuclear@0 35 float ampbuf[VE_AMP];
nuclear@0 36 int ampptr;
nuclear@0 37
nuclear@0 38 float nearDC[VE_NEARDC];
nuclear@0 39 float nearDC_acc;
nuclear@0 40 float nearDC_partialacc;
nuclear@0 41 int nearptr;
nuclear@0 42
nuclear@0 43 } envelope_filter_state;
nuclear@0 44
nuclear@0 45 typedef struct {
nuclear@0 46 int begin;
nuclear@0 47 int end;
nuclear@0 48 float *window;
nuclear@0 49 float total;
nuclear@0 50 } envelope_band;
nuclear@0 51
nuclear@0 52 typedef struct {
nuclear@0 53 int ch;
nuclear@0 54 int winlength;
nuclear@0 55 int searchstep;
nuclear@0 56 float minenergy;
nuclear@0 57
nuclear@0 58 mdct_lookup mdct;
nuclear@0 59 float *mdct_win;
nuclear@0 60
nuclear@0 61 envelope_band band[VE_BANDS];
nuclear@0 62 envelope_filter_state *filter;
nuclear@0 63 int stretch;
nuclear@0 64
nuclear@0 65 int *mark;
nuclear@0 66
nuclear@0 67 long storage;
nuclear@0 68 long current;
nuclear@0 69 long curmark;
nuclear@0 70 long cursor;
nuclear@0 71 } envelope_lookup;
nuclear@0 72
nuclear@0 73 extern void _ve_envelope_init(envelope_lookup *e,vorbis_info *vi);
nuclear@0 74 extern void _ve_envelope_clear(envelope_lookup *e);
nuclear@0 75 extern long _ve_envelope_search(vorbis_dsp_state *v);
nuclear@0 76 extern void _ve_envelope_shift(envelope_lookup *e,long shift);
nuclear@0 77 extern int _ve_envelope_mark(vorbis_dsp_state *v);
nuclear@0 78
nuclear@0 79
nuclear@0 80 #endif