envelope.h - vx32 - Local 9vx git repository for patches.
(HTM) git clone git://r-36.net/vx32
(DIR) Log
(DIR) Files
(DIR) Refs
---
envelope.h (2179B)
---
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 1994-2002 *
9 * by the XIPHOPHORUS Company http://www.xiph.org/ *
10 * *
11 ********************************************************************
12
13 function: PCM data envelope analysis and manipulation
14 last mod: $Id: envelope.h 1919 2005-07-24 14:18:04Z baford $
15
16 ********************************************************************/
17
18 #ifndef _V_ENVELOPE_
19 #define _V_ENVELOPE_
20
21 #include "mdct.h"
22
23 #define VE_PRE 16
24 #define VE_WIN 4
25 #define VE_POST 2
26 #define VE_AMP (VE_PRE+VE_POST-1)
27
28 #define VE_BANDS 7
29 #define VE_NEARDC 15
30
31 #define VE_MINSTRETCH 2 /* a bit less than short block */
32 #define VE_MAXSTRETCH 12 /* one-third full block */
33
34 typedef struct {
35 float ampbuf[VE_AMP];
36 int ampptr;
37
38 float nearDC[VE_NEARDC];
39 float nearDC_acc;
40 float nearDC_partialacc;
41 int nearptr;
42
43 } envelope_filter_state;
44
45 typedef struct {
46 int begin;
47 int end;
48 float *window;
49 float total;
50 } envelope_band;
51
52 typedef struct {
53 int ch;
54 int winlength;
55 int searchstep;
56 float minenergy;
57
58 mdct_lookup mdct;
59 float *mdct_win;
60
61 envelope_band band[VE_BANDS];
62 envelope_filter_state *filter;
63 int stretch;
64
65 int *mark;
66
67 long storage;
68 long current;
69 long curmark;
70 long cursor;
71 } envelope_lookup;
72
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);
78
79
80 #endif
81