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 /****************************************************************************************
19 Portions 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)
26 Permission to distribute, modify and use this file under the standard license
27 terms 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
66 extern "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 
123 
124 
125