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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/* ------------------------------------------------------------------
* Copyright (C) 1998-2009 PacketVideo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
/****************************************************************************************
Portions of this file are derived from the following 3GPP standard:
3GPP TS 26.073
ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
Available from http://www.3gpp.org
(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
Permission to distribute, modify and use this file under the standard license
terms listed above has been obtained from the copyright holder.
****************************************************************************************/
/*
------------------------------------------------------------------------------
Filename: /audio/gsm_amr/c/src/include/lpc.h
Date: 01/29/2002
------------------------------------------------------------------------------
REVISION HISTORY
Description: Replaced "int" and/or "char" with OSCL defined types.
Description: Moved _cplusplus #ifdef after Include section.
Description:
------------------------------------------------------------------------------
INCLUDE DESCRIPTION
File : lpc.h
Purpose : 2 LP analyses centered at 2nd and 4th subframe
for mode 12.2. For all other modes a
LP analysis centered at 4th subframe is
performed.
------------------------------------------------------------------------------
*/
#ifndef _LPC_H_
#define _LPC_H_
#define lpc_h "$Id $"
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "typedef.h"
#include "levinson.h"
#include "mode.h"
/*--------------------------------------------------------------------------*/
#ifdef __cplusplus
extern "C"
{
#endif
/*----------------------------------------------------------------------------
; MACROS
; [Define module specific macros here]
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; [Include all pre-processor statements here.]
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL VARIABLES REFERENCES
; [Declare variables used in this module but defined elsewhere]
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; SIMPLE TYPEDEF'S
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; ENUMERATED TYPEDEF'S
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; STRUCTURES TYPEDEF'S
----------------------------------------------------------------------------*/
typedef struct
{
LevinsonState *levinsonSt;
} lpcState;
/*----------------------------------------------------------------------------
; GLOBAL FUNCTION DEFINITIONS
; [List function prototypes here]
----------------------------------------------------------------------------*/
Word16 lpc_init(lpcState **st);
/* initialize one instance of the pre processing state.
Stores pointer to filter status struct in *st. This pointer has to
be passed to lpc in each call.
returns 0 on success
*/
Word16 lpc_reset(lpcState *st);
/* reset of pre processing state (i.e. set state memory to zero)
returns 0 on success
*/
void lpc_exit(lpcState **st);
/* de-initialize pre processing state (i.e. free status struct)
stores NULL in *st
*/
void lpc(
lpcState *st, /* i/o: State struct */
enum Mode mode, /* i : coder mode */
Word16 x[], /* i : Input signal Q15 */
Word16 x_12k2[], /* i : Input signal (EFR) Q15 */
Word16 a[], /* o : predictor coefficients Q12 */
Flag *pOverflow
);
#ifdef __cplusplus
}
#endif
#endif /* _LPC_H_ */
|
