1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
| #include "ref.h"
|
| void ref_var_f32(
| float32_t * pSrc,
| uint32_t blockSize,
| float32_t * pResult)
| {
| uint32_t i;
| float32_t sum=0, sumsq=0;
|
| if (blockSize == 1)
| {
| *pResult = 0;
| return;
| }
|
| for(i=0;i<blockSize;i++)
| {
| sum += pSrc[i];
| sumsq += pSrc[i] * pSrc[i];
| }
| *pResult = (sumsq - sum * sum / (float32_t)blockSize) / ((float32_t)blockSize - 1);
| }
|
| void ref_var_q31(
| q31_t * pSrc,
| uint32_t blockSize,
| q31_t * pResult)
| {
| uint32_t i;
| q63_t sum=0, sumsq=0;
| q31_t in;
|
| if (blockSize == 1)
| {
| *pResult = 0;
| return;
| }
|
| for(i=0;i<blockSize;i++)
| {
| in = pSrc[i] >> 8;
| sum += in;
| sumsq += (q63_t)in * in;
| }
| *pResult = (sumsq - sum * sum / (q31_t)blockSize) / ((q31_t)blockSize - 1) >> 15;
| }
|
| void ref_var_q15(
| q15_t * pSrc,
| uint32_t blockSize,
| q15_t * pResult)
| {
| uint32_t i;
| q31_t sum=0;
| q63_t sumsq=0;
|
| if (blockSize == 1)
| {
| *pResult = 0;
| return;
| }
|
| for(i=0;i<blockSize;i++)
| {
| sum += pSrc[i];
| sumsq += (q63_t)pSrc[i] * pSrc[i];
| }
| *pResult = (q31_t)((sumsq - (q63_t)sum * sum / (q63_t)blockSize) / ((q63_t)blockSize - 1)) >> 15;
| }
|
|
