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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
use crate::Signal;
use dasp_interpolate::Interpolator;
#[derive(Clone)]
pub struct Converter<S, I>
where
S: Signal,
I: Interpolator,
{
source: S,
interpolator: I,
interpolation_value: f64,
source_to_target_ratio: f64,
}
impl<S, I> Converter<S, I>
where
S: Signal,
I: Interpolator,
{
#[inline]
pub fn from_hz_to_hz(source: S, interpolator: I, source_hz: f64, target_hz: f64) -> Self {
Self::scale_playback_hz(source, interpolator, source_hz / target_hz)
}
#[inline]
pub fn scale_playback_hz(source: S, interpolator: I, scale: f64) -> Self {
assert!(
scale > 0.0,
"We can't yield any frames at 0 times a second!"
);
Converter {
source: source,
interpolator: interpolator,
interpolation_value: 0.0,
source_to_target_ratio: scale,
}
}
#[inline]
pub fn scale_sample_hz(source: S, interpolator: I, scale: f64) -> Self {
Self::scale_playback_hz(source, interpolator, 1.0 / scale)
}
#[inline]
pub fn set_hz_to_hz(&mut self, source_hz: f64, target_hz: f64) {
self.set_playback_hz_scale(source_hz / target_hz)
}
#[inline]
pub fn set_playback_hz_scale(&mut self, scale: f64) {
self.source_to_target_ratio = scale;
}
#[inline]
pub fn set_sample_hz_scale(&mut self, scale: f64) {
self.set_playback_hz_scale(1.0 / scale);
}
#[inline]
pub fn source(&self) -> &S {
&self.source
}
#[inline]
pub fn source_mut(&mut self) -> &mut S {
&mut self.source
}
#[inline]
pub fn into_source(self) -> S {
self.source
}
}
impl<S, I> Signal for Converter<S, I>
where
S: Signal,
I: Interpolator<Frame = S::Frame>,
{
type Frame = S::Frame;
fn next(&mut self) -> Self::Frame {
let Converter {
ref mut source,
ref mut interpolator,
ref mut interpolation_value,
source_to_target_ratio,
} = *self;
while *interpolation_value >= 1.0 {
interpolator.next_source_frame(source.next());
*interpolation_value -= 1.0;
}
let out = interpolator.interpolate(*interpolation_value);
*interpolation_value += source_to_target_ratio;
out
}
fn is_exhausted(&self) -> bool {
self.source.is_exhausted() && self.interpolation_value >= 1.0
}
}