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
From2iToMono_Float(const LVM_FLOAT * src,LVM_FLOAT * dst,LVM_INT16 n)24 void From2iToMono_Float(const LVM_FLOAT* src, LVM_FLOAT* dst, LVM_INT16 n) {
25 LVM_INT16 ii;
26 LVM_FLOAT Temp;
27
28 for (ii = n; ii != 0; ii--) {
29 Temp = (*src);
30 src++;
31
32 Temp += (*src);
33 src++;
34
35 *dst = Temp / 2.0f;
36 dst++;
37 }
38
39 return;
40 }
41 /*
42 * FUNCTION: FromMcToMono_Float
43 *
44 * DESCRIPTION:
45 * Creates a mono stream from a multichannel input taking the avergae of
46 * sample values of all channels
47 *
48 * PARAMETERS:
49 * src Source
50 * dst Destination
51 * NrFrames Number of frames
52 * NrChannels Number of channels
53 *
54 * RETURNS:
55 * void
56 *
57 */
FromMcToMono_Float(const LVM_FLOAT * src,LVM_FLOAT * dst,LVM_INT16 NrFrames,LVM_INT16 NrChannels)58 void FromMcToMono_Float(const LVM_FLOAT* src, LVM_FLOAT* dst, LVM_INT16 NrFrames,
59 LVM_INT16 NrChannels) {
60 LVM_INT16 ii, jj;
61 LVM_FLOAT Temp;
62
63 for (ii = NrFrames; ii != 0; ii--) {
64 Temp = 0.0f;
65 for (jj = NrChannels; jj != 0; jj--) {
66 Temp += (*src);
67 src++;
68 }
69 *dst = Temp / NrChannels;
70 dst++;
71 }
72
73 return;
74 }
75