1/* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18/****************************************************************************************
19Portions of this file are derived from the following 3GPP standard:
20
21    3GPP TS 26.073
22    ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23    Available from http://www.3gpp.org
24
25(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26Permission to distribute, modify and use this file under the standard license
27terms listed above has been obtained from the copyright holder.
28****************************************************************************************/
29/*
30------------------------------------------------------------------------------
31
32
33
34 Filename: /audio/gsm_amr/c/src/include/lpc.h
35
36     Date: 01/29/2002
37
38------------------------------------------------------------------------------
39 REVISION HISTORY
40
41 Description:  Replaced "int" and/or "char" with OSCL defined types.
42
43 Description: Moved _cplusplus #ifdef after Include section.
44
45 Description:
46
47------------------------------------------------------------------------------
48 INCLUDE DESCRIPTION
49
50      File             : lpc.h
51      Purpose          : 2 LP analyses centered at 2nd and 4th subframe
52                         for mode 12.2. For all other modes a
53                         LP analysis centered at 4th subframe is
54                         performed.
55
56------------------------------------------------------------------------------
57*/
58
59#ifndef _LPC_H_
60#define _LPC_H_
61#define lpc_h "$Id $"
62
63/*----------------------------------------------------------------------------
64; INCLUDES
65----------------------------------------------------------------------------*/
66#include "typedef.h"
67#include "levinson.h"
68#include "mode.h"
69
70
71/*--------------------------------------------------------------------------*/
72#ifdef __cplusplus
73extern "C"
74{
75#endif
76
77    /*----------------------------------------------------------------------------
78    ; MACROS
79    ; [Define module specific macros here]
80    ----------------------------------------------------------------------------*/
81
82    /*----------------------------------------------------------------------------
83    ; DEFINES
84    ; [Include all pre-processor statements here.]
85    ----------------------------------------------------------------------------*/
86
87    /*----------------------------------------------------------------------------
88    ; EXTERNAL VARIABLES REFERENCES
89    ; [Declare variables used in this module but defined elsewhere]
90    ----------------------------------------------------------------------------*/
91
92    /*----------------------------------------------------------------------------
93    ; SIMPLE TYPEDEF'S
94    ----------------------------------------------------------------------------*/
95
96    /*----------------------------------------------------------------------------
97    ; ENUMERATED TYPEDEF'S
98    ----------------------------------------------------------------------------*/
99
100    /*----------------------------------------------------------------------------
101    ; STRUCTURES TYPEDEF'S
102    ----------------------------------------------------------------------------*/
103    typedef struct
104    {
105        LevinsonState *levinsonSt;
106    } lpcState;
107
108
109    /*----------------------------------------------------------------------------
110    ; GLOBAL FUNCTION DEFINITIONS
111    ; [List function prototypes here]
112    ----------------------------------------------------------------------------*/
113    Word16 lpc_init(lpcState **st);
114    /* initialize one instance of the pre processing state.
115       Stores pointer to filter status struct in *st. This pointer has to
116       be passed to lpc in each call.
117       returns 0 on success
118     */
119
120    Word16 lpc_reset(lpcState *st);
121    /* reset of pre processing state (i.e. set state memory to zero)
122       returns 0 on success
123     */
124    void lpc_exit(lpcState **st);
125    /* de-initialize pre processing state (i.e. free status struct)
126       stores NULL in *st
127     */
128
129    void lpc(
130        lpcState *st,     /* i/o: State struct                */
131        enum Mode mode,   /* i  : coder mode                  */
132        Word16 x[],       /* i  : Input signal           Q15  */
133        Word16 x_12k2[],  /* i  : Input signal (EFR)     Q15  */
134        Word16 a[],       /* o  : predictor coefficients Q12  */
135        Flag   *pOverflow
136    );
137
138
139#ifdef __cplusplus
140}
141#endif
142
143#endif  /* _LPC_H_ */
144
145
146
147
148