a_refl.h revision 4f1efc098cb5791c3e9f483f2af84aef70d2d0a0 
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/include/a_refl.h
35
36     Date: 08/11/2000
37
38------------------------------------------------------------------------------
39 REVISION HISTORY
40
41 Description: Moved _cplusplus #ifdef after Include section.
42
43 Description:
44
45------------------------------------------------------------------------------
46 INCLUDE DESCRIPTION
47
48    File             : a_refl.h
49    Purpose          : Convert from direct form coefficients to
50                       reflection coefficients
51
52------------------------------------------------------------------------------
53*/
54
55#ifndef A_REFL_H
56#define A_REFL_H
57#define a_refl_h "$Id $"
58
59/*----------------------------------------------------------------------------
60; INCLUDES
61----------------------------------------------------------------------------*/
62#include "typedef.h"
63
64/*--------------------------------------------------------------------------*/
65#ifdef __cplusplus
66extern "C"
67{
68#endif
69
70    /*----------------------------------------------------------------------------
71    ; MACROS
72    ; Define module specific macros here
73    ----------------------------------------------------------------------------*/
74
75    /*----------------------------------------------------------------------------
76    ; DEFINES
77    ; Include all pre-processor statements here.
78    ----------------------------------------------------------------------------*/
79
80    /*----------------------------------------------------------------------------
81    ; EXTERNAL VARIABLES REFERENCES
82    ; Declare variables used in this module but defined elsewhere
83    ----------------------------------------------------------------------------*/
84
85    /*----------------------------------------------------------------------------
86    ; SIMPLE TYPEDEF'S
87    ----------------------------------------------------------------------------*/
88
89    /*----------------------------------------------------------------------------
90    ; ENUMERATED TYPEDEF'S
91    ----------------------------------------------------------------------------*/
92
93    /*----------------------------------------------------------------------------
94    ; STRUCTURES TYPEDEF'S
95    ----------------------------------------------------------------------------*/
96
97    /*----------------------------------------------------------------------------
98    ; GLOBAL FUNCTION DEFINITIONS
99    ; Function Prototype declaration
100    ----------------------------------------------------------------------------*/
101    /*
102     *   FUNCTION:  A_Refl()
103     *   PURPOSE: Convert from direct form coefficients to reflection coefficients
104     *   DESCRIPTION:
105     *       Directform coeffs in Q12 are converted to
106     *       reflection coefficients Q15
107     */
108    void A_Refl(
109        Word16 a[],        /* i   : Directform coefficients */
110        Word16 refl[],     /* o   : Reflection coefficients */
111        Flag   *pOverflow
112    );
113
114    /*----------------------------------------------------------------------------
115    ; END
116    ----------------------------------------------------------------------------*/
117#ifdef __cplusplus
118}
119#endif
120
121#endif /* _A_REFL_H_ */
122
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125