sqrt_l_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/sqrt_l_tbl.c
32
33------------------------------------------------------------------------------
34 REVISION HISTORY
35
36 Description: Changed the table name to sqrt_l_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 sqrt_l_table[] used by the sqrt_l_exp
50 function.
51
52    sqrt_l_tbl[i] = sqrt((i+16)*2^-6) * 2^15, i.e. sqrt(x) scaled Q15
53
54 ------------------------------------------------------------------------------
55*/
56
57/*----------------------------------------------------------------------------
58; INCLUDES
59----------------------------------------------------------------------------*/
60#include "typedef.h"
61#include "sqrt_l.h"
62
63/*--------------------------------------------------------------------------*/
64#ifdef __cplusplus
65extern "C"
66{
67#endif
68
69    /*----------------------------------------------------------------------------
70    ; MACROS
71    ; [Define module specific macros here]
72    ----------------------------------------------------------------------------*/
73
74    /*----------------------------------------------------------------------------
75    ; DEFINES
76    ; [Include all pre-processor statements here. Include conditional
77    ; compile variables also.]
78    ----------------------------------------------------------------------------*/
79
80    /*----------------------------------------------------------------------------
81    ; LOCAL FUNCTION DEFINITIONS
82    ; [List function prototypes here]
83    ----------------------------------------------------------------------------*/
84
85    /*----------------------------------------------------------------------------
86    ; LOCAL VARIABLE DEFINITIONS
87    ; [Variable declaration - defined here and used outside this module]
88    ----------------------------------------------------------------------------*/
89    const Word16 sqrt_l_tbl[50] =
90    {
91        16384, 16888, 17378, 17854, 18318, 18770, 19212, 19644, 20066, 20480,
92        20886, 21283, 21674, 22058, 22435, 22806, 23170, 23530, 23884, 24232,
93        24576, 24915, 25249, 25580, 25905, 26227, 26545, 26859, 27170, 27477,
94        27780, 28081, 28378, 28672, 28963, 29251, 29537, 29819, 30099, 30377,
95        30652, 30924, 31194, 31462, 31727, 31991, 32252, 32511, 32767, 32767
96    };
97
98
99    /*--------------------------------------------------------------------------*/
100#ifdef __cplusplus
101}
102#endif
103
104/*
105------------------------------------------------------------------------------
106 FUNCTION NAME:
107------------------------------------------------------------------------------
108 INPUT AND OUTPUT DEFINITIONS
109
110 Inputs:
111    None
112
113 Outputs:
114    None
115
116 Returns:
117    None
118
119 Global Variables Used:
120    None
121
122 Local Variables Needed:
123    None
124
125------------------------------------------------------------------------------
126 FUNCTION DESCRIPTION
127
128 None
129
130------------------------------------------------------------------------------
131 REQUIREMENTS
132
133 None
134
135------------------------------------------------------------------------------
136 REFERENCES
137
138 [1] inv_sqrt.tab file,  UMTS GSM AMR speech codec, R99 - Version 3.2.0,
139 March 2, 2001
140
141------------------------------------------------------------------------------
142 PSEUDO-CODE
143
144
145------------------------------------------------------------------------------
146 RESOURCES USED [optional]
147
148 When the code is written for a specific target processor the
149 the resources used should be documented below.
150
151 HEAP MEMORY USED: x bytes
152
153 STACK MEMORY USED: x bytes
154
155 CLOCK CYCLES: (cycle count equation for this function) + (variable
156                used to represent cycle count for each subroutine
157                called)
158     where: (cycle count variable) = cycle count for [subroutine
159                                     name]
160
161------------------------------------------------------------------------------
162 CAUTION [optional]
163 [State any special notes, constraints or cautions for users of this function]
164
165------------------------------------------------------------------------------
166*/
167
168/*----------------------------------------------------------------------------
169; FUNCTION CODE
170----------------------------------------------------------------------------*/
171
172