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
use std::time::Duration;
use Sample;
use Source;
pub fn speed<I>(input: I, factor: f32) -> Speed<I>
where I: Source, I::Item: Sample
{
Speed {
input: input,
factor: factor,
}
}
#[derive(Clone, Debug)]
pub struct Speed<I> where I: Source, I::Item: Sample {
input: I,
factor: f32,
}
impl<I> Iterator for Speed<I> where I: Source, I::Item: Sample {
type Item = I::Item;
#[inline]
fn next(&mut self) -> Option<I::Item> {
self.input.next()
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.input.size_hint()
}
}
impl<I> ExactSizeIterator for Speed<I> where I: Source + ExactSizeIterator, I::Item: Sample {
}
impl<I> Source for Speed<I> where I: Source, I::Item: Sample {
#[inline]
fn get_current_frame_len(&self) -> Option<usize> {
self.input.get_current_frame_len()
}
#[inline]
fn get_channels(&self) -> u16 {
self.input.get_channels()
}
#[inline]
fn get_samples_rate(&self) -> u32 {
(self.input.get_samples_rate() as f32 * self.factor) as u32
}
#[inline]
fn get_total_duration(&self) -> Option<Duration> {
if let Some(duration) = self.input.get_total_duration() {
let as_ns = duration.as_secs() * 1000000000 + duration.subsec_nanos() as u64;
let new_val = (as_ns as f32 / self.factor) as u64;
Some(Duration::new(new_val / 1000000000, (new_val % 1000000000) as u32))
} else {
None
}
}
}