vrshoot
view libs/vorbis/envelope.h @ 0:b2f14e535253
initial commit
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 01 Feb 2014 19:58:19 +0200 |
| parents | |
| children |
line source
1 /********************************************************************
2 * *
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
7 * *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
9 * by the Xiph.Org Foundation http://www.xiph.org/ *
10 * *
11 ********************************************************************
13 function: PCM data envelope analysis and manipulation
14 last mod: $Id: envelope.h 16227 2009-07-08 06:58:46Z xiphmont $
16 ********************************************************************/
18 #ifndef _V_ENVELOPE_
19 #define _V_ENVELOPE_
21 #include "mdct.h"
23 #define VE_PRE 16
24 #define VE_WIN 4
25 #define VE_POST 2
26 #define VE_AMP (VE_PRE+VE_POST-1)
28 #define VE_BANDS 7
29 #define VE_NEARDC 15
31 #define VE_MINSTRETCH 2 /* a bit less than short block */
32 #define VE_MAXSTRETCH 12 /* one-third full block */
34 typedef struct {
35 float ampbuf[VE_AMP];
36 int ampptr;
38 float nearDC[VE_NEARDC];
39 float nearDC_acc;
40 float nearDC_partialacc;
41 int nearptr;
43 } envelope_filter_state;
45 typedef struct {
46 int begin;
47 int end;
48 float *window;
49 float total;
50 } envelope_band;
52 typedef struct {
53 int ch;
54 int winlength;
55 int searchstep;
56 float minenergy;
58 mdct_lookup mdct;
59 float *mdct_win;
61 envelope_band band[VE_BANDS];
62 envelope_filter_state *filter;
63 int stretch;
65 int *mark;
67 long storage;
68 long current;
69 long curmark;
70 long cursor;
71 } envelope_lookup;
73 extern void _ve_envelope_init(envelope_lookup *e,vorbis_info *vi);
74 extern void _ve_envelope_clear(envelope_lookup *e);
75 extern long _ve_envelope_search(vorbis_dsp_state *v);
76 extern void _ve_envelope_shift(envelope_lookup *e,long shift);
77 extern int _ve_envelope_mark(vorbis_dsp_state *v);
80 #endif