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 From2iToMono_32
26 ***********************************************************************************/
27
From2iToMono_32(const LVM_INT32 * src,LVM_INT32 * dst,LVM_INT16 n)28 void From2iToMono_32( const LVM_INT32 *src,
29 LVM_INT32 *dst,
30 LVM_INT16 n)
31 {
32 LVM_INT16 ii;
33 LVM_INT32 Temp;
34
35 for (ii = n; ii != 0; ii--)
36 {
37 Temp = (*src>>1);
38 src++;
39
40 Temp +=(*src>>1);
41 src++;
42
43 *dst = Temp;
44 dst++;
45 }
46
47 return;
48 }
From2iToMono_Float(const LVM_FLOAT * src,LVM_FLOAT * dst,LVM_INT16 n)49 void From2iToMono_Float( const LVM_FLOAT *src,
50 LVM_FLOAT *dst,
51 LVM_INT16 n)
52 {
53 LVM_INT16 ii;
54 LVM_FLOAT Temp;
55
56 for (ii = n; ii != 0; ii--)
57 {
58 Temp = (*src);
59 src++;
60
61 Temp += (*src);
62 src++;
63
64 *dst = Temp / 2.0f;
65 dst++;
66 }
67
68 return;
69 }
70 #ifdef SUPPORT_MC
71 /*
72 * FUNCTION: FromMcToMono_Float
73 *
74 * DESCRIPTION:
75 * Creates a mono stream from a multichannel input taking the avergae of
76 * sample values of all channels
77 *
78 * PARAMETERS:
79 * src Source
80 * dst Destination
81 * NrFrames Number of frames
82 * NrChannels Number of channels
83 *
84 * RETURNS:
85 * void
86 *
87 */
FromMcToMono_Float(const LVM_FLOAT * src,LVM_FLOAT * dst,LVM_INT16 NrFrames,LVM_INT16 NrChannels)88 void FromMcToMono_Float(const LVM_FLOAT *src,
89 LVM_FLOAT *dst,
90 LVM_INT16 NrFrames,
91 LVM_INT16 NrChannels)
92 {
93 LVM_INT16 ii, jj;
94 LVM_FLOAT Temp;
95
96 for (ii = NrFrames; ii != 0; ii--)
97 {
98 Temp = 0.0f;
99 for (jj = NrChannels; jj !=0; jj--)
100 {
101 Temp += (*src);
102 src++;
103 }
104 *dst = Temp / NrChannels;
105 dst++;
106 }
107
108 return;
109 }
110 #endif
111
112 /**********************************************************************************/
113