sendspin 0.1.2

Hyper-efficient Rust implementation of the Sendspin Protocol for synchronized multi-room audio streaming
Documentation 
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
145
146
147
148

use sendspin::audio::decode::{Decoder, PcmDecoder};
use sendspin::audio::Sample;

#[test]
fn test_decode_pcm_16bit() {
    let decoder = PcmDecoder::new(16);

    // 4 samples (8 bytes) of 16-bit PCM
    let data = vec![
        0x00, 0x04, // 1024 in little-endian
        0x00, 0x08, // 2048
        0xFF, 0xFF, // -1
        0x00, 0x00, // 0
    ];

    let samples = decoder.decode(&data).unwrap();

    assert_eq!(samples.len(), 4);
    assert_eq!(samples[0].to_i16(), 1024);
    assert_eq!(samples[1].to_i16(), 2048);
    assert_eq!(samples[2].to_i16(), -1);
    assert_eq!(samples[3].to_i16(), 0);
}

#[test]
fn test_decode_pcm_24bit() {
    let decoder = PcmDecoder::new(24);

    // 2 samples (6 bytes) of 24-bit PCM
    let data = vec![
        0x00, 0x10, 0x00, // 4096 in little-endian 24-bit
        0xFF, 0xFF, 0xFF, // -1 in 24-bit
    ];

    let samples = decoder.decode(&data).unwrap();

    assert_eq!(samples.len(), 2);
    assert_eq!(samples[0], Sample(4096));
    assert_eq!(samples[1], Sample(-1));
}

#[test]
fn test_decode_pcm_16bit_empty_input() {
    let decoder = PcmDecoder::new(16);
    let samples = decoder.decode(&[]).unwrap();
    assert_eq!(samples.len(), 0);
}

#[test]
fn test_decode_pcm_24bit_empty_input() {
    let decoder = PcmDecoder::new(24);
    let samples = decoder.decode(&[]).unwrap();
    assert_eq!(samples.len(), 0);
}

#[test]
fn test_decode_pcm_16bit_misaligned_trailing_byte_dropped() {
    let decoder = PcmDecoder::new(16);
    // 3 bytes: one complete 16-bit sample + 1 trailing byte
    let data = vec![0x00, 0x04, 0xFF];
    let samples = decoder.decode(&data).unwrap();
    // chunks_exact(2) silently drops the trailing byte
    assert_eq!(samples.len(), 1);
    assert_eq!(samples[0].to_i16(), 1024);
}

#[test]
fn test_decode_pcm_24bit_misaligned_trailing_bytes_dropped() {
    let decoder = PcmDecoder::new(24);
    // 5 bytes: one complete 24-bit sample + 2 trailing bytes
    let data = vec![0x00, 0x10, 0x00, 0xAB, 0xCD];
    let samples = decoder.decode(&data).unwrap();
    assert_eq!(samples.len(), 1);
    assert_eq!(samples[0], Sample(4096));
}

#[test]
fn test_decode_pcm_16bit_single_sample_max() {
    let decoder = PcmDecoder::new(16);
    let data = vec![0xFF, 0x7F]; // i16::MAX = 32767
    let samples = decoder.decode(&data).unwrap();
    assert_eq!(samples.len(), 1);
    assert_eq!(samples[0].to_i16(), i16::MAX);
}

#[test]
fn test_decode_pcm_16bit_single_sample_min() {
    let decoder = PcmDecoder::new(16);
    let data = vec![0x00, 0x80]; // i16::MIN = -32768 in LE
    let samples = decoder.decode(&data).unwrap();
    assert_eq!(samples.len(), 1);
    assert_eq!(samples[0].to_i16(), i16::MIN);
}

#[test]
fn test_decode_pcm_24bit_single_sample_max() {
    let decoder = PcmDecoder::new(24);
    let data = vec![0xFF, 0xFF, 0x7F];
    let samples = decoder.decode(&data).unwrap();
    assert_eq!(samples.len(), 1);
    assert_eq!(samples[0], Sample::MAX);
}

#[test]
fn test_decode_pcm_24bit_single_sample_min() {
    let decoder = PcmDecoder::new(24);
    let data = vec![0x00, 0x00, 0x80]; // -8388608 in 24-bit LE
    let samples = decoder.decode(&data).unwrap();
    assert_eq!(samples.len(), 1);
    assert_eq!(samples[0], Sample::MIN);
}

#[test]
fn test_decode_pcm_zero_bit_depth_unsupported() {
    let decoder = PcmDecoder::new(0);
    let result = decoder.decode(&[0x00]);
    assert!(result.is_err());
}

#[test]
fn test_decode_pcm_unsupported_bit_depth() {
    let decoder = PcmDecoder::new(8);
    let result = decoder.decode(&[0x00, 0x01]);
    assert!(result.is_err());
}

#[test]
fn test_decode_pcm_32bit_unsupported() {
    let decoder = PcmDecoder::new(32);
    let result = decoder.decode(&[0x00; 4]);
    assert!(result.is_err());
}

#[test]
fn test_decode_pcm_16bit_sub_sample_input() {
    let decoder = PcmDecoder::new(16);
    // Single byte — not enough for one 16-bit sample
    let samples = decoder.decode(&[0xFF]).unwrap();
    assert_eq!(samples.len(), 0);
}

#[test]
fn test_decode_pcm_24bit_sub_sample_input() {
    let decoder = PcmDecoder::new(24);
    // Two bytes — not enough for one 24-bit sample
    let samples = decoder.decode(&[0xFF, 0xFF]).unwrap();
    assert_eq!(samples.len(), 0);
}