1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/*****************************************************************************/
/* BroadVoice(R)16 (BV16) Fixed-Point ANSI-C Source Code */
/* Revision Date: November 13, 2009 */
/* Version 1.1 */
/*****************************************************************************/
/*****************************************************************************/
/* Copyright 2000-2009 Broadcom Corporation */
/* */
/* This software is provided under the GNU Lesser General Public License, */
/* version 2.1, as published by the Free Software Foundation ("LGPL"). */
/* This program is distributed in the hope that it will be useful, but */
/* WITHOUT ANY SUPPORT OR WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the LGPL for */
/* more details. A copy of the LGPL is available at */
/* http://www.broadcom.com/licenses/LGPLv2.1.php, */
/* or by writing to the Free Software Foundation, Inc., */
/* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/*****************************************************************************/
/*****************************************************************************
bvcommon.h : Common Fixed-Point Library: common #defines and prototypes
$Log$
******************************************************************************/
#ifndef BVCOMMON_H
#define BVCOMMON_H
/* ----- Basic Codec Parameters ----- */
#define LPCO 8 /* LPC Order for 8 kHz sampled lowband signal */
#define Ngrd 60
#define LSPMIN 49 /* 0.00150 minimum lsp frequency */
#define LSPMAX 32694 /* 0.99775 maximum lsp frequency */
#define DLSPMIN 410 /* 0.01250 minimum lsp spacing */
#define STBLDIM 3 /* dimension of stability enforcement */
/* LPC bandwidth expansion */
extern Word16 bwel[];
/* LPC to lsp Conversion */
extern Word16 grid[];
/* LPC WEIGHTING FILTER */
extern Word16 STWAL[];
/* Coarse Pitch Search */
extern Word16 invk[];
/* Pitch tap codebook - actually content different for BV16 and BV32 */
extern Word16 pp9cb[];
/* Function prototypes */
void azfilter(
Word16 a[], /* (i) Q12 : prediction coefficients */
Word16 m, /* (i) : LPC order */
Word16 x[], /* (i) Q0 : input signal samples, incl. past */
Word16 y[], /* (o) Q0 : filtered output signal */
Word16 lg /* (i) : size of filtering */
);
void apfilter(
Word16 a[], /* (i) Q12 : prediction coefficients */
Word16 m, /* (i) : LPC order */
Word16 x[], /* (i) Q0 : input signal */
Word16 y[], /* (o) Q0 : output signal */
Word16 lg, /* (i) : size of filtering */
Word16 mem[], /* (i/o) Q0: filter memory */
Word16 update /* (i) : memory update flag */
);
void lsp2a(
Word16 lsp[], /* (i) Q15 : line spectral frequencies */
Word16 a[]); /* (o) Q12 : predictor coefficients (order = 10) */
void stblz_lsp(
Word16 *lsp, /* Q15 */
Word16 order);
Word16 stblchck(
Word16 *x,
Word16 vdim);
void a2lsp(
Word16 a[], /* (i) Q12 : predictor coefficients */
Word16 lsp[], /* (o) Q15 : line spectral frequencies */
Word16 old_lsp[]); /* (i) : old lsp[] (in case not found 10 roots) */
void Autocorr(
Word32 r[], /* (o) : Autocorrelations */
Word16 x[], /* (i) : Input signal */
Word16 window[],/* (i) : LPC Analysis window */
Word16 l_window,/* (i) : window length */
Word16 m); /* (i) : LPC order */
void Spectral_Smoothing(
Word16 m, /* (i) : LPC order */
Word32 rl[], /* (i/o) : Autocorrelations lags */
Word16 lag_h[], /* (i) : SST coefficients (msb) */
Word16 lag_l[]); /* (i) : SST coefficients (lsb) */
void Levinson(
Word32 r32[], /* (i) : r32[] double precision vector of autocorrelation coefficients */
Word16 a[], /* (o) : a[] in Q12 - LPC coefficients */
Word16 old_a[], /* (i/o): old_a[] in Q12 - previous LPC coefficients */
Word16 m); /* (i) : LPC order */
void pp3dec(
Word16 idx,
Word16 *b);
void vqdec(
Word16 *xq,
Word16 idx,
Word16 *cb,
Word16 vdim);
#ifdef _MSC_VER
#include "math.h"
static __inline double round(double val)
{
return floor(val + 0.5);
}
#endif
#endif /* BVCOMMON_H */
|
