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 26.173
22 ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec
23 Available from http://www.3gpp.org
24
25 (C) 2007, 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: median5.cpp
35
36 Date: 05/08/2007
37
38 ------------------------------------------------------------------------------
39 REVISION HISTORY
40
41
42 Description:
43
44 ------------------------------------------------------------------------------
45 INPUT AND OUTPUT DEFINITIONS
46
47 INPUT
48 X[-2:2] 16-bit integers.
49
50 RETURN VALUE
51 The median of {X[-2], X[-1],..., X[2]}.
52
53 ------------------------------------------------------------------------------
54 FUNCTION DESCRIPTION
55
56 Returns the median of the set {X[-2], X[-1],..., X[2]},
57 whose elements are 16-bit integers.
58
59 ------------------------------------------------------------------------------
60 REQUIREMENTS
61
62
63 ------------------------------------------------------------------------------
64 REFERENCES
65
66 ------------------------------------------------------------------------------
67 PSEUDO-CODE
68
69 ------------------------------------------------------------------------------
70 */
71
72
73 /*----------------------------------------------------------------------------
74 ; INCLUDES
75 ----------------------------------------------------------------------------*/
76
77 #include "pv_amr_wb_type_defs.h"
78 #include "pvamrwbdecoder_basic_op.h"
79 #include "pvamrwbdecoder_acelp.h"
80 #include "pvamrwb_math_op.h"
81
82 /*----------------------------------------------------------------------------
83 ; MACROS
84 ; Define module specific macros here
85 ----------------------------------------------------------------------------*/
86
87
88 /*----------------------------------------------------------------------------
89 ; DEFINES
90 ; Include all pre-processor statements here. Include conditional
91 ; compile variables also.
92 ----------------------------------------------------------------------------*/
93
94 /*----------------------------------------------------------------------------
95 ; LOCAL FUNCTION DEFINITIONS
96 ; Function Prototype declaration
97 ----------------------------------------------------------------------------*/
98
99 /*----------------------------------------------------------------------------
100 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
101 ; Variable declaration - defined here and used outside this module
102 ----------------------------------------------------------------------------*/
103
104 /*----------------------------------------------------------------------------
105 ; EXTERNAL FUNCTION REFERENCES
106 ; Declare functions defined elsewhere and referenced in this module
107 ----------------------------------------------------------------------------*/
108
109 /*----------------------------------------------------------------------------
110 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
111 ; Declare variables used in this module but defined elsewhere
112 ----------------------------------------------------------------------------*/
113
114 /*----------------------------------------------------------------------------
115 ; FUNCTION CODE
116 ----------------------------------------------------------------------------*/
117
median5(int16 x[])118 int16 median5(int16 x[])
119 {
120 int16 x1, x2, x3, x4, x5;
121 int16 tmp;
122
123 x1 = x[-2];
124 x2 = x[-1];
125 x3 = x[0];
126 x4 = x[1];
127 x5 = x[2];
128
129
130
131 if (x2 < x1)
132 {
133 tmp = x1;
134 x1 = x2;
135 x2 = tmp;
136 }
137 if (x3 < x1)
138 {
139 tmp = x1;
140 x1 = x3;
141 x3 = tmp;
142 }
143 if (x4 < x1)
144 {
145 tmp = x1;
146 x1 = x4;
147 x4 = tmp;
148 }
149 if (x5 < x1)
150 {
151 x5 = x1;
152 }
153 if (x3 < x2)
154 {
155 tmp = x2;
156 x2 = x3;
157 x3 = tmp;
158 }
159 if (x4 < x2)
160 {
161 tmp = x2;
162 x2 = x4;
163 x4 = tmp;
164 }
165 if (x5 < x2)
166 {
167 x5 = x2;
168 }
169 if (x4 < x3)
170 {
171 x3 = x4;
172 }
173 if (x5 < x3)
174 {
175 x3 = x5;
176 }
177 return (x3);
178 }
179
180
181