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 ****************************************************************************************/
31 Pathname: ./gsm-amr/c/src/extract_h.c
33 ------------------------------------------------------------------------------
36 Description: Created separate file for the extract_h function. Sync'ed up
37 with the current template and fixed tabs.
39 Description: Removed conditional code that updates WMOPS counter
44 ------------------------------------------------------------------------------
45 INPUT AND OUTPUT DEFINITIONS
48 L_var1 = 32 bit long signed integer (Word32 ) whose value falls
49 in the range : 0x8000 0000 <= L_var1 <= 0x7fff ffff.
51 Local Stores/Buffers/Pointers Needed:
54 Global Stores/Buffers/Pointers Needed:
58 L_var1 = Most significant word of input (Word16)
60 Pointers and Buffers Modified:
63 Local Stores Modified:
66 Global Stores Modified:
69 ------------------------------------------------------------------------------
72 This function returns the 16 MSB of the input, L_var1.
74 ------------------------------------------------------------------------------
79 ------------------------------------------------------------------------------
82 [1] basicop2.c, ETS Version 2.0.0, February 8, 1999
84 ------------------------------------------------------------------------------
87 Word16 extract_h (Word32 L_var1)
91 var_out = (Word16) (L_var1 >> 16);
93 multiCounter[currCounter].extract_h++;
98 ------------------------------------------------------------------------------
100 When the code is written for a specific target processor the
101 the resources used should be documented below.
103 STACK USAGE: [stack count for this module] + [variable to represent
104 stack usage for each subroutine called]
106 where: [stack usage variable] = stack usage for [subroutine
107 name] (see [filename].ext)
109 DATA MEMORY USED: x words
111 PROGRAM MEMORY USED: x words
113 CLOCK CYCLES: [cycle count equation for this module] + [variable
114 used to represent cycle count for each subroutine
117 where: [cycle count variable] = cycle count for [subroutine
118 name] (see [filename].ext)
120 ------------------------------------------------------------------------------
124 /*----------------------------------------------------------------------------
126 ----------------------------------------------------------------------------*/
127 #include "basic_op.h"
129 /*----------------------------------------------------------------------------
131 ; Define module specific macros here
132 ----------------------------------------------------------------------------*/
134 /*----------------------------------------------------------------------------
136 ; Include all pre-processor statements here. Include conditional
137 ; compile variables also.
138 ----------------------------------------------------------------------------*/
140 /*----------------------------------------------------------------------------
141 ; LOCAL FUNCTION DEFINITIONS
142 ; Function Prototype declaration
143 ----------------------------------------------------------------------------*/
145 /*----------------------------------------------------------------------------
146 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
147 ; Variable declaration - defined here and used outside this module
148 ----------------------------------------------------------------------------*/
150 /*----------------------------------------------------------------------------
151 ; EXTERNAL FUNCTION REFERENCES
152 ; Declare functions defined elsewhere and referenced in this module
153 ----------------------------------------------------------------------------*/
155 /*----------------------------------------------------------------------------
156 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
157 ; Declare variables used in this module but defined elsewhere
158 ----------------------------------------------------------------------------*/
160 /*----------------------------------------------------------------------------
162 ----------------------------------------------------------------------------*/
163 Word16 extract_h(Word32 L_var1)
165 /*----------------------------------------------------------------------------
166 ; Define all local variables
167 ----------------------------------------------------------------------------*/
169 /*----------------------------------------------------------------------------
171 ----------------------------------------------------------------------------*/
173 /*----------------------------------------------------------------------------
174 ; Return nothing or data or data pointer
175 ----------------------------------------------------------------------------*/
176 return ((Word16)(L_var1 >> 16));