inv_sqrt_tbl.cpp revision 1ead790eadd0e09a118308caccc7ac37d36f43f3 
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 Filename: /audio/gsm_amr/c/src/inv_sqrt_tbl.c
32
33------------------------------------------------------------------------------
34 REVISION HISTORY
35
36 Description: Changed table name to inv_sqrt_tbl
37
38 Description: Added #ifdef __cplusplus and removed "extern" from table
39              definition.
40
41 Description: Put "extern" back.
42
43 Who:                           Date:
44 Description:
45
46------------------------------------------------------------------------------
47 MODULE DESCRIPTION
48
49 This file contains the declaration for table[] used by the inv_sqrt function.
50
51------------------------------------------------------------------------------
52*/
53
54/*----------------------------------------------------------------------------
55; INCLUDES
56----------------------------------------------------------------------------*/
57#include "typedef.h"
58#include "inv_sqrt.h"
59
60/*--------------------------------------------------------------------------*/
61#ifdef __cplusplus
62extern "C"
63{
64#endif
65
66    /*----------------------------------------------------------------------------
67    ; MACROS
68    ; [Define module specific macros here]
69    ----------------------------------------------------------------------------*/
70
71    /*----------------------------------------------------------------------------
72    ; DEFINES
73    ; [Include all pre-processor statements here. Include conditional
74    ; compile variables also.]
75    ----------------------------------------------------------------------------*/
76
77    /*----------------------------------------------------------------------------
78    ; LOCAL FUNCTION DEFINITIONS
79    ; [List function prototypes here]
80    ----------------------------------------------------------------------------*/
81
82    /*----------------------------------------------------------------------------
83    ; LOCAL VARIABLE DEFINITIONS
84    ; [Variable declaration - defined here and used outside this module]
85    ----------------------------------------------------------------------------*/
86    const Word16 inv_sqrt_tbl[49] =
87    {
88
89        32767, 31790, 30894, 30070, 29309, 28602, 27945, 27330, 26755, 26214,
90        25705, 25225, 24770, 24339, 23930, 23541, 23170, 22817, 22479, 22155,
91        21845, 21548, 21263, 20988, 20724, 20470, 20225, 19988, 19760, 19539,
92        19326, 19119, 18919, 18725, 18536, 18354, 18176, 18004, 17837, 17674,
93        17515, 17361, 17211, 17064, 16921, 16782, 16646, 16514, 16384
94    };
95
96    /*--------------------------------------------------------------------------*/
97#ifdef __cplusplus
98}
99#endif
100
101/*
102------------------------------------------------------------------------------
103 FUNCTION NAME:
104------------------------------------------------------------------------------
105 INPUT AND OUTPUT DEFINITIONS
106
107 Inputs:
108    None
109
110 Outputs:
111    None
112
113 Returns:
114    None
115
116 Global Variables Used:
117    None
118
119 Local Variables Needed:
120    None
121
122------------------------------------------------------------------------------
123 FUNCTION DESCRIPTION
124
125 None
126
127------------------------------------------------------------------------------
128 REQUIREMENTS
129
130 None
131
132------------------------------------------------------------------------------
133 REFERENCES
134
135 [1] inv_sqrt.tab file,  UMTS GSM AMR speech codec, R99 - Version 3.2.0,
136 March 2, 2001
137
138------------------------------------------------------------------------------
139 PSEUDO-CODE
140
141
142------------------------------------------------------------------------------
143 RESOURCES USED [optional]
144
145 When the code is written for a specific target processor the
146 the resources used should be documented below.
147
148 HEAP MEMORY USED: x bytes
149
150 STACK MEMORY USED: x bytes
151
152 CLOCK CYCLES: (cycle count equation for this function) + (variable
153                used to represent cycle count for each subroutine
154                called)
155     where: (cycle count variable) = cycle count for [subroutine
156                                     name]
157
158------------------------------------------------------------------------------
159 CAUTION [optional]
160 [State any special notes, constraints or cautions for users of this function]
161
162------------------------------------------------------------------------------
163*/
164
165/*----------------------------------------------------------------------------
166; FUNCTION CODE
167----------------------------------------------------------------------------*/
168
169