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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/* libxtract feature extraction library
*
* Copyright (C) 2006 Jamie Bullock
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
/* xtract_delta.c: defines functions that extract a feature as a single value from more than one input vector */
#include <math.h>
#include "xtract/libxtract.h"
int xtract_flux(const float *data, const int N, const void *argv , float *result){
return xtract_lnorm(data, N, argv, result);
}
int xtract_lnorm(const float *data, const int N, const void *argv , float *result){
int n,
type;
float order,
temp = 0.f;
order = *(float *)argv;
type = (int)*(float *)argv+1;
order = order > 0 ? order : 2.f;
switch(type){
case XTRACT_POSITIVE_SLOPE:
for(n = 0; n < N; n++){
temp = powf(data[n], order);
if(data[n] > 0)
*result += temp;
}
break;
default:
for(n = 0; n < N; n++)
*result += powf(data[n], order);
break;
}
*result = powf(*result, 1.f / order);
return XTRACT_SUCCESS;
}
int xtract_attack_time(const float *data, const int N, const void *argv , float *result){
return XTRACT_FEATURE_NOT_IMPLEMENTED;
}
int xtract_decay_time(const float *data, const int N, const void *argv, float *result){
return XTRACT_FEATURE_NOT_IMPLEMENTED;
}
int xtract_difference_vector(const float *data, const int N, const void *argv, float *result){
const float *frame1,
*frame2;
int n;
n = N >> 1;
frame1 = data;
frame2 = data + n;
while(n--)
result[n] = frame1[n] - frame2[n];
return XTRACT_SUCCESS;
}
|