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
|
#include <assert.h>
#include "sig.h"
typedef struct ops_scale_ctxt_t {
sig_t *value, *min, *max;
} ops_scale_ctxt_t;
static size_t ops_scale_size(va_list ap)
{
return sizeof(ops_scale_ctxt_t);
}
/* expects three sig_t's: value, min, max.
* min is assumed to be always <= max,
* and value is assumed to always be 0-1
*/
static void ops_scale_init(void *context, va_list ap)
{
ops_scale_ctxt_t *ctxt = context;
assert(ctxt);
ctxt->value = va_arg(ap, sig_t *);
ctxt->min = va_arg(ap, sig_t *);
ctxt->max = va_arg(ap, sig_t *);
}
static void ops_scale_destroy(void *context)
{
ops_scale_ctxt_t *ctxt = context;
assert(ctxt);
sig_free(ctxt->value);
sig_free(ctxt->min);
sig_free(ctxt->max);
}
static float ops_scale_output(void *context, unsigned ticks_ms)
{
ops_scale_ctxt_t *ctxt = context;
float value, min, max;
assert(ctxt);
value = sig_output(ctxt->value, ticks_ms);
min = sig_output(ctxt->min, ticks_ms);
max = sig_output(ctxt->max, ticks_ms);
assert(max >= min);
return value * (max - min) + min;
}
sig_ops_t sig_ops_scale = {
.size = ops_scale_size,
.init = ops_scale_init,
.destroy = ops_scale_destroy,
.output = ops_scale_output,
};
|
