1 /*
2 * Copyright (C) 2004-2010 NXP Software
3 * Copyright (C) 2010 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 /**********************************************************************************
19 INCLUDE FILES
20 ***********************************************************************************/
21
22 #include "VectorArithmetic.h"
23
24 /**********************************************************************************
25 FUNCTION From2iToMS_16x16
26 ***********************************************************************************/
27
From2iToMS_16x16(const LVM_INT16 * src,LVM_INT16 * dstM,LVM_INT16 * dstS,LVM_INT16 n)28 void From2iToMS_16x16( const LVM_INT16 *src,
29 LVM_INT16 *dstM,
30 LVM_INT16 *dstS,
31 LVM_INT16 n )
32 {
33 LVM_INT32 temp1,left,right;
34 LVM_INT16 ii;
35 for (ii = n; ii != 0; ii--)
36 {
37 left = (LVM_INT32)*src;
38 src++;
39
40 right = (LVM_INT32)*src;
41 src++;
42
43 /* Compute M signal*/
44 temp1 = (left+right)>>1;
45 *dstM = (LVM_INT16)temp1;
46 dstM++;
47
48 /* Compute S signal*/
49 temp1 = (left-right)>>1;
50 *dstS = (LVM_INT16)temp1;
51 dstS++;
52 }
53
54 return;
55 }
56 #ifdef BUILD_FLOAT
From2iToMS_Float(const LVM_FLOAT * src,LVM_FLOAT * dstM,LVM_FLOAT * dstS,LVM_INT16 n)57 void From2iToMS_Float( const LVM_FLOAT *src,
58 LVM_FLOAT *dstM,
59 LVM_FLOAT *dstS,
60 LVM_INT16 n )
61 {
62 LVM_FLOAT temp1,left,right;
63 LVM_INT16 ii;
64 for (ii = n; ii != 0; ii--)
65 {
66 left = (LVM_FLOAT)*src;
67 src++;
68
69 right = (LVM_FLOAT)*src;
70 src++;
71
72 /* Compute M signal*/
73 temp1 = (left + right) / 2.0f;
74 *dstM = (LVM_FLOAT)temp1;
75 dstM++;
76
77 /* Compute S signal*/
78 temp1 = (left - right) / 2.0f;
79 *dstS = (LVM_FLOAT)temp1;
80 dstS++;
81 }
82
83 return;
84 }
85 #endif
86 /**********************************************************************************/
87