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 COPY_16
26 ***********************************************************************************/
27
Copy_16(const LVM_INT16 * src,LVM_INT16 * dst,LVM_INT16 n)28 void Copy_16( const LVM_INT16 *src,
29 LVM_INT16 *dst,
30 LVM_INT16 n )
31 {
32 LVM_INT16 ii;
33
34 if (src > dst)
35 {
36 for (ii = n; ii != 0; ii--)
37 {
38 *dst = *src;
39 dst++;
40 src++;
41 }
42 }
43 else
44 {
45 src += n - 1;
46 dst += n - 1;
47 for (ii = n; ii != 0; ii--)
48 {
49 *dst = *src;
50 dst--;
51 src--;
52 }
53 }
54
55 return;
56 }
57 #ifdef BUILD_FLOAT
Copy_Float(const LVM_FLOAT * src,LVM_FLOAT * dst,LVM_INT16 n)58 void Copy_Float( const LVM_FLOAT *src,
59 LVM_FLOAT *dst,
60 LVM_INT16 n )
61 {
62 LVM_INT16 ii;
63
64 if (src > dst)
65 {
66 for (ii = n; ii != 0; ii--)
67 {
68 *dst = *src;
69 dst++;
70 src++;
71 }
72 }
73 else
74 {
75 src += n - 1;
76 dst += n - 1;
77 for (ii = n; ii != 0; ii--)
78 {
79 *dst = *src;
80 dst--;
81 src--;
82 }
83 }
84
85 return;
86 }
87 #ifdef SUPPORT_MC
88 // Extract out the stereo channel pair from multichannel source.
Copy_Float_Mc_Stereo(const LVM_FLOAT * src,LVM_FLOAT * dst,LVM_INT16 NrFrames,LVM_INT32 NrChannels)89 void Copy_Float_Mc_Stereo(const LVM_FLOAT *src,
90 LVM_FLOAT *dst,
91 LVM_INT16 NrFrames, /* Number of frames */
92 LVM_INT32 NrChannels)
93 {
94 LVM_INT16 ii;
95
96 if (NrChannels >= 2)
97 {
98 for (ii = NrFrames; ii != 0; ii--)
99 {
100 dst[0] = src[0];
101 dst[1] = src[1];
102 dst += 2;
103 src += NrChannels;
104 }
105 }
106 else if (NrChannels == 1)
107 { // not expected to occur, provided for completeness.
108 src += (NrFrames - 1);
109 dst += 2 * (NrFrames - 1);
110 for (ii = NrFrames; ii != 0; ii--)
111 {
112 dst[0] = src[0];
113 dst[1] = src[0];
114 dst -= 2;
115 src --;
116 }
117 }
118 }
119
120 // Merge a multichannel source with stereo contained in dst, to dst.
Copy_Float_Stereo_Mc(const LVM_FLOAT * src,LVM_FLOAT * dst,LVM_INT16 NrFrames,LVM_INT32 NrChannels)121 void Copy_Float_Stereo_Mc(const LVM_FLOAT *src,
122 LVM_FLOAT *dst,
123 LVM_INT16 NrFrames, /* Number of frames*/
124 LVM_INT32 NrChannels)
125 {
126 LVM_INT16 ii, jj;
127 LVM_FLOAT *src_st = dst + 2 * (NrFrames - 1);
128
129 // repack dst which carries stereo information
130 // together with the upper channels of src.
131 dst += NrChannels * (NrFrames - 1);
132 src += NrChannels * (NrFrames - 1);
133 for (ii = NrFrames; ii != 0; ii--)
134 {
135 dst[1] = src_st[1];
136 dst[0] = src_st[0]; // copy 1 before 0 is required for NrChannels == 3.
137 for (jj = 2; jj < NrChannels; jj++)
138 {
139 dst[jj] = src[jj];
140 }
141 dst -= NrChannels;
142 src -= NrChannels;
143 src_st -= 2;
144 }
145 }
146 #endif
147 #endif
148 /**********************************************************************************/
149