p-chan 0.2.1

Multimedia (Audio, Raster) Channel Newtypes and Conversions
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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173

//! Low-level integer channel upscaling conversions

use crate::math::{self, Signed, Unsigned};

#[inline(always)]
const fn clamp(mut fraction: u32, min: u32, max: u32) -> u32 {
    if fraction < min {
        fraction = min;
    }

    if fraction > max {
        fraction = max;
    }

    fraction
}

/// Upscale `u24` fraction to [`u32`] fraction.
#[inline(always)]
pub const fn u24_to_u32(fraction: u32) -> u32 {
    let fraction = clamp(fraction, 0, u32::MAX >> 8);
    let upper = fraction << 8;
    let lower = upper >> 24;

    upper | lower
}

/// Upscale [`u16`] fraction to [`u32`] fraction.
#[inline(always)]
pub const fn u16_to_u32(fraction: u16) -> u32 {
    let fraction = fraction as u32;

    fraction | (fraction << 16)
}

/// Upscale `u12` fraction to [`u32`] fraction.
#[inline(always)]
pub const fn u12_to_u32(fraction: u16) -> u32 {
    let fraction = clamp(fraction as u32, 0, u32::MAX >> 20);
    let fraction = fraction | (fraction << 12);

    u24_to_u32(fraction)
}

/// Upscale [`u8`] fraction to [`u32`] fraction.
#[inline(always)]
pub const fn u8_to_u32(fraction: u8) -> u32 {
    u32::from_ne_bytes([fraction, fraction, fraction, fraction])
}

/// Upscale `i24` fraction to [`i32`] fraction.
#[inline(always)]
pub const fn i24_to_i32(fraction: i32) -> i32 {
    const MIN: u32 = Unsigned(-2_i32.pow(23)).reinterpret_with_offset();

    let fraction = Unsigned(fraction).reinterpret_with_offset();
    let fraction = fraction.saturating_sub(MIN);

    Signed(u24_to_u32(fraction)).reinterpret_with_offset()
}

/// Upscale [`i16`] fraction to [`i32`] fraction.
#[inline(always)]
pub const fn i16_to_i32(fraction: i16) -> i32 {
    Signed(u16_to_u32(Unsigned(fraction).reinterpret_with_offset()))
        .reinterpret_with_offset()
}

/// Upscale `i12` fraction to [`i32`] fraction.
#[inline(always)]
pub const fn i12_to_i32(fraction: i16) -> i32 {
    const MIN: u16 = Unsigned(-2_i16.pow(11)).reinterpret_with_offset();

    let fraction = Unsigned(fraction).reinterpret_with_offset();
    let fraction = fraction.saturating_sub(MIN);

    Signed(u12_to_u32(fraction)).reinterpret_with_offset()
}

/// Upscale [`i8`] fraction to [`i32`] fraction.
#[inline(always)]
pub const fn i8_to_i32(fraction: i8) -> i32 {
    Signed(u8_to_u32(Unsigned(fraction).reinterpret_with_offset()))
        .reinterpret_with_offset()
}

/// Upscale [`f32`] to [`f64`] and normalize.
#[inline(always)]
pub const fn f32_to_f64(float: f32) -> f64 {
    math::normalize_f32(float) as f64
}

/// Upscale [`u32`] fraction to [`u64`] fraction.
#[inline(always)]
pub const fn u32_to_u64(fraction: u32) -> u64 {
    let fraction = fraction as u64;

    fraction | (fraction << 32)
}

/// Upscale [`i32`] fraction to [`i64`] fraction.
#[inline(always)]
pub const fn i32_to_i64(fraction: i32) -> i64 {
    Signed(u32_to_u64(Unsigned(fraction).reinterpret_with_offset()))
        .reinterpret_with_offset()
}

/// Upscale `u24` fraction to [`u64`] fraction.
#[inline(always)]
pub const fn u24_to_u64(fraction: u32) -> u64 {
    let fraction = clamp(fraction, 0, u32::MAX >> 8) as u64;
    let upper = fraction << 40;
    let middle = upper >> 24;
    let lower = middle >> 24;

    upper | middle | lower
}

/// Upscale [`u16`] fraction to [`u64`] fraction.
#[inline(always)]
pub const fn u16_to_u64(fraction: u16) -> u64 {
    u32_to_u64(u16_to_u32(fraction))
}

/// Upscale `u12` fraction to [`u64`] fraction.
#[inline(always)]
pub const fn u12_to_u64(fraction: u16) -> u64 {
    let fraction = u12_to_u32(fraction) >> 8;

    u24_to_u64(fraction)
}

/// Upscale [`u8`] fraction to [`u64`] fraction.
#[inline(always)]
pub const fn u8_to_u64(fraction: u8) -> u64 {
    u32_to_u64(u8_to_u32(fraction))
}

/// Upscale `i24` fraction to [`i64`] fraction.
#[inline(always)]
pub const fn i24_to_i64(fraction: i32) -> i64 {
    const MIN: u32 = Unsigned(-2_i32.pow(23)).reinterpret_with_offset();

    let fraction = Unsigned(fraction).reinterpret_with_offset();
    let fraction = fraction.saturating_sub(MIN);

    Signed(u24_to_u64(fraction)).reinterpret_with_offset()
}

/// Upscale [`i16`] fraction to [`i64`] fraction.
#[inline(always)]
pub const fn i16_to_i64(fraction: i16) -> i64 {
    Signed(u16_to_u64(Unsigned(fraction).reinterpret_with_offset()))
        .reinterpret_with_offset()
}

/// Upscale `i12` fraction to [`i64`] fraction.
#[inline(always)]
pub const fn i12_to_i64(fraction: i16) -> i64 {
    const MIN: u16 = Unsigned(-2_i16.pow(11)).reinterpret_with_offset();

    let fraction = Unsigned(fraction).reinterpret_with_offset();
    let fraction = fraction.saturating_sub(MIN);

    Signed(u12_to_u64(fraction)).reinterpret_with_offset()
}

/// Upscale [`i8`] fraction to [`i64`] fraction.
#[inline(always)]
pub const fn i8_to_i64(fraction: i8) -> i64 {
    Signed(u8_to_u64(Unsigned(fraction).reinterpret_with_offset()))
        .reinterpret_with_offset()
}