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