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
use std::time::Duration;

use crate::source::buffered::Buffered;

use crate::{Sample, Source};

use super::SeekError;

/// Internal function that builds a `Repeat` object.
pub fn repeat<I>(input: I) -> Repeat<I>
where
    I: Source,
    I::Item: Sample,
{
    let input = input.buffered();
    Repeat {
        inner: input.clone(),
        next: input,
    }
}

/// A source that repeats the given source.
pub struct Repeat<I>
where
    I: Source,
    I::Item: Sample,
{
    inner: Buffered<I>,
    next: Buffered<I>,
}

impl<I> Iterator for Repeat<I>
where
    I: Source,
    I::Item: Sample,
{
    type Item = <I as Iterator>::Item;

    #[inline]
    fn next(&mut self) -> Option<<I as Iterator>::Item> {
        if let Some(value) = self.inner.next() {
            return Some(value);
        }

        self.inner = self.next.clone();
        self.inner.next()
    }

    #[inline]
    fn size_hint(&self) -> (usize, Option<usize>) {
        // infinite
        (0, None)
    }
}

impl<I> Source for Repeat<I>
where
    I: Iterator + Source,
    I::Item: Sample,
{
    #[inline]
    fn current_frame_len(&self) -> Option<usize> {
        match self.inner.current_frame_len() {
            Some(0) => self.next.current_frame_len(),
            a => a,
        }
    }

    #[inline]
    fn channels(&self) -> u16 {
        match self.inner.current_frame_len() {
            Some(0) => self.next.channels(),
            _ => self.inner.channels(),
        }
    }

    #[inline]
    fn sample_rate(&self) -> u32 {
        match self.inner.current_frame_len() {
            Some(0) => self.next.sample_rate(),
            _ => self.inner.sample_rate(),
        }
    }

    #[inline]
    fn total_duration(&self) -> Option<Duration> {
        None
    }

    #[inline]
    fn try_seek(&mut self, pos: Duration) -> Result<(), SeekError> {
        self.inner.try_seek(pos)
    }
}

impl<I> Clone for Repeat<I>
where
    I: Source,
    I::Item: Sample,
{
    #[inline]
    fn clone(&self) -> Repeat<I> {
        Repeat {
            inner: self.inner.clone(),
            next: self.next.clone(),
        }
    }
}