mediaway-sw 0.1.6

Pure Rust sans-io software codec fallbacks (no C codec FFI)
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

#![cfg(test)]
#![allow(
    clippy::unwrap_used,
    clippy::expect_used,
    reason = "test modules may unwrap"
)]

use super::*;

#[test]
fn predict_16x16_vertical_repeats_top_row() {
    let top = [10u8; 16];
    let out = predict_16x16(0, Some(&top), None, None).unwrap();
    assert_eq!(out, [10u8; 256]);
}

#[test]
fn predict_16x16_horizontal_repeats_left_column_per_row() {
    let mut left = [0u8; 16];
    for (i, v) in left.iter_mut().enumerate() {
        *v = i as u8;
    }
    let out = predict_16x16(1, None, Some(&left), None).unwrap();
    for y in 0..16 {
        assert_eq!(&out[y * 16..y * 16 + 16], [y as u8; 16].as_slice());
    }
}

#[test]
fn predict_16x16_dc_averages_uniform_top_and_left() {
    let top = [16u8; 16];
    let left = [16u8; 16];
    let out = predict_16x16(2, Some(&top), Some(&left), None).unwrap();
    assert_eq!(out, [16u8; 256]);
}

#[test]
fn predict_16x16_dc_falls_back_to_128_when_no_neighbors() {
    let out = predict_16x16(2, None, None, None).unwrap();
    assert_eq!(out, [128u8; 256]);
}

#[test]
fn predict_16x16_dc_uses_top_only_when_left_unavailable() {
    let top = [16u8; 16];
    let out = predict_16x16(2, Some(&top), None, None).unwrap();
    assert_eq!(out, [16u8; 256]);
}

#[test]
fn predict_16x16_plane_of_uniform_neighbors_reproduces_the_constant() {
    let top = [100u8; 16];
    let left = [100u8; 16];
    let out = predict_16x16(3, Some(&top), Some(&left), Some(100)).unwrap();
    assert_eq!(out, [100u8; 256]);
}

#[test]
fn predict_16x16_rejects_vertical_without_top() {
    assert_eq!(
        predict_16x16(0, None, Some(&[0; 16]), None),
        Err(H264Error::UnavailableIntraNeighbor)
    );
}

#[test]
fn predict_16x16_rejects_invalid_mode() {
    assert_eq!(
        predict_16x16(4, Some(&[0; 16]), Some(&[0; 16]), Some(0)),
        Err(H264Error::InvalidMbType)
    );
}

#[test]
fn predict_chroma_8x8_vertical_repeats_top_row() {
    let top = [7u8; 8];
    let out = predict_chroma_8x8(2, Some(&top), None, None).unwrap();
    assert_eq!(out, [7u8; 64]);
}

#[test]
fn predict_chroma_8x8_horizontal_repeats_left_column_per_row() {
    let mut left = [0u8; 8];
    for (i, v) in left.iter_mut().enumerate() {
        *v = (i as u8) * 10;
    }
    let out = predict_chroma_8x8(1, None, Some(&left), None).unwrap();
    for y in 0..8 {
        assert_eq!(&out[y * 8..y * 8 + 8], [(y as u8) * 10; 8].as_slice());
    }
}

#[test]
fn predict_chroma_8x8_dc_uses_per_quadrant_averaging_rules() {
    let top = [100u8; 8];
    let left = [50u8; 8];
    let out = predict_chroma_8x8(0, Some(&top), Some(&left), None).unwrap();

    // Top-left combines top+left: (400 + 200 + 4) >> 3 = 75.
    assert_eq!(out[0], 75);
    // Top-right prefers top only: avg4(100,100,100,100) = 100.
    assert_eq!(out[4], 100);
    // Bottom-left prefers left only: avg4(50,50,50,50) = 50.
    assert_eq!(out[4 * 8], 50);
    // Bottom-right combines top+left: same sums as top-left = 75.
    assert_eq!(out[4 * 8 + 4], 75);
}

#[test]
fn predict_chroma_8x8_dc_falls_back_to_128_with_no_neighbors() {
    let out = predict_chroma_8x8(0, None, None, None).unwrap();
    assert_eq!(out, [128u8; 64]);
}

#[test]
fn predict_chroma_8x8_plane_of_uniform_neighbors_reproduces_the_constant() {
    let top = [50u8; 8];
    let left = [50u8; 8];
    let out = predict_chroma_8x8(3, Some(&top), Some(&left), Some(50)).unwrap();
    assert_eq!(out, [50u8; 64]);
}

#[test]
fn predict_chroma_8x8_rejects_plane_without_corner() {
    assert_eq!(
        predict_chroma_8x8(3, Some(&[0; 8]), Some(&[0; 8]), None),
        Err(H264Error::UnavailableIntraNeighbor)
    );
}

#[test]
fn predict_chroma_8x8_rejects_invalid_mode() {
    assert_eq!(
        predict_chroma_8x8(4, Some(&[0; 8]), Some(&[0; 8]), Some(0)),
        Err(H264Error::InvalidMbType)
    );
}