1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
18 /****************************************************************************************
19 Portions of this file are derived from the following 3GPP standard:
22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23 Available from http://www.3gpp.org
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 ****************************************************************************************/
33 ------------------------------------------------------------------------------
34 INPUT AND OUTPUT DEFINITIONS
37 var1 = 16 bit short signed integer (Word16) whose value falls in
38 the range : 0xffff 8000 <= var1 <= 0x0000 7fff.
40 Local Stores/Buffers/Pointers Needed:
43 Global Stores/Buffers/Pointers Needed:
47 var1 = negated value of input (Word16)
49 Pointers and Buffers Modified:
52 Local Stores Modified:
55 Global Stores Modified:
58 ------------------------------------------------------------------------------
61 This function negates var1 with saturation; saturate in the case where input
62 is -32768: negate(var1) = sub(0,var1).
64 ------------------------------------------------------------------------------
69 ------------------------------------------------------------------------------
72 [1] basicop2.c, ETS Version 2.0.0, February 8, 1999
74 ------------------------------------------------------------------------------
77 Word16 negate (Word16 var1)
81 var_out = (var1 == MIN_16) ? MAX_16 : -var1;
83 multiCounter[currCounter].negate++;
88 ------------------------------------------------------------------------------
92 /*----------------------------------------------------------------------------
94 ----------------------------------------------------------------------------*/
97 /*----------------------------------------------------------------------------
99 ; Define module specific macros here
100 ----------------------------------------------------------------------------*/
102 /*----------------------------------------------------------------------------
104 ; Include all pre-processor statements here. Include conditional
105 ; compile variables also.
106 ----------------------------------------------------------------------------*/
108 /*----------------------------------------------------------------------------
109 ; LOCAL FUNCTION DEFINITIONS
110 ; Function Prototype declaration
111 ----------------------------------------------------------------------------*/
113 /*----------------------------------------------------------------------------
114 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
115 ; Variable declaration - defined here and used outside this module
116 ----------------------------------------------------------------------------*/
118 /*----------------------------------------------------------------------------
119 ; EXTERNAL FUNCTION REFERENCES
120 ; Declare functions defined elsewhere and referenced in this module
121 ----------------------------------------------------------------------------*/
123 /*----------------------------------------------------------------------------
124 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
125 ; Declare variables used in this module but defined elsewhere
126 ----------------------------------------------------------------------------*/
128 /*----------------------------------------------------------------------------
130 ----------------------------------------------------------------------------*/
131 Word16 negate(register Word16 var1)
133 /*----------------------------------------------------------------------------
134 ; Define all local variables
135 ----------------------------------------------------------------------------*/
137 /*----------------------------------------------------------------------------
139 ----------------------------------------------------------------------------*/
140 var1 = (var1 == MIN_16) ? MAX_16 : -var1;
142 /*----------------------------------------------------------------------------
143 ; Return nothing or data or data pointer
144 ----------------------------------------------------------------------------*/