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
use crate::audio;
use crate::audio::sample::Sample;
use std;
pub struct Receiver<S> {
samples: Vec<S>,
num_frames: usize,
num_channels: usize,
}
impl<S> Receiver<S>
where
S: Sample,
{
pub fn new(num_frames: usize, num_channels: usize) -> Self {
assert!(num_frames > 0);
assert!(num_channels > 0);
let num_samples = num_frames + num_channels;
Receiver {
samples: Vec::with_capacity(num_samples),
num_frames: num_frames,
num_channels: num_channels,
}
}
pub fn read_buffer<M, F>(
&mut self,
mut model: M,
capture: F,
input: &[S],
channels: usize,
sample_rate: u32,
) -> M
where
F: audio::stream::input::CaptureFn<M, S>,
{
let Receiver {
ref mut samples,
num_frames,
num_channels,
} = *self;
assert_eq!(
input.len() % channels,
0,
"the input length must be a multiple of the number of channels"
);
assert_eq!(
channels, num_channels,
"the number of channels differs to that with which `Receiver` was initialised"
);
let mut input_samples = input.iter().cloned();
let num_samples = num_frames * channels;
loop {
let num_to_take = num_samples - samples.len();
samples.extend(input_samples.by_ref().take(num_to_take));
if samples.len() < num_samples {
break;
}
let interleaved_samples = std::mem::replace(samples, Vec::new()).into_boxed_slice();
let buffer = audio::Buffer {
interleaved_samples,
channels,
sample_rate,
};
capture(&mut model, &buffer);
std::mem::swap(samples, &mut buffer.interleaved_samples.into_vec());
samples.clear();
}
model
}
}