talw-timecode 0.1.0

SMPTE timecode arithmetic — parse, format, convert, drop-frame
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

#![cfg_attr(not(feature = "std"), no_std)]

use core::fmt;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Rational {
    pub num: u32,
    pub den: u32,
}

impl Rational {
    pub const fn new(num: u32, den: u32) -> Self {
        Self { num, den }
    }

    pub fn to_f64(self) -> f64 {
        self.num as f64 / self.den as f64
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum FrameRate {
    Fps23_976,
    Fps24,
    Fps25,
    Fps29_97Df,
    Fps29_97Ndf,
    Fps30,
    Fps48,
    Fps50,
    Fps59_94Df,
    Fps59_94Ndf,
    Fps60,
}

impl FrameRate {
    pub const fn rational(self) -> Rational {
        match self {
            Self::Fps23_976 => Rational::new(24000, 1001),
            Self::Fps24 => Rational::new(24, 1),
            Self::Fps25 => Rational::new(25, 1),
            Self::Fps29_97Df | Self::Fps29_97Ndf => Rational::new(30000, 1001),
            Self::Fps30 => Rational::new(30, 1),
            Self::Fps48 => Rational::new(48, 1),
            Self::Fps50 => Rational::new(50, 1),
            Self::Fps59_94Df | Self::Fps59_94Ndf => Rational::new(60000, 1001),
            Self::Fps60 => Rational::new(60, 1),
        }
    }

    pub const fn nominal(self) -> u32 {
        match self {
            Self::Fps23_976 => 24,
            Self::Fps24 => 24,
            Self::Fps25 => 25,
            Self::Fps29_97Df | Self::Fps29_97Ndf => 30,
            Self::Fps30 => 30,
            Self::Fps48 => 48,
            Self::Fps50 => 50,
            Self::Fps59_94Df | Self::Fps59_94Ndf => 60,
            Self::Fps60 => 60,
        }
    }

    pub const fn is_drop_frame(self) -> bool {
        matches!(self, Self::Fps29_97Df | Self::Fps59_94Df)
    }

    pub const fn drop_count(self) -> u32 {
        match self {
            Self::Fps29_97Df => 2,
            Self::Fps59_94Df => 4,
            _ => 0,
        }
    }

    pub fn to_f64(self) -> f64 {
        self.rational().to_f64()
    }

    pub fn from_float(fps: f64, drop_frame: bool) -> Option<Self> {
        let rounded = (fps * 100.0).round() as u32;
        match (rounded, drop_frame) {
            (2397, _) => Some(Self::Fps23_976),
            (2400, _) => Some(Self::Fps24),
            (2500, _) => Some(Self::Fps25),
            (2997, true) => Some(Self::Fps29_97Df),
            (2997, false) => Some(Self::Fps29_97Ndf),
            (3000, _) => Some(Self::Fps30),
            (4800, _) => Some(Self::Fps48),
            (5000, _) => Some(Self::Fps50),
            (5994, true) => Some(Self::Fps59_94Df),
            (5994, false) => Some(Self::Fps59_94Ndf),
            (6000, _) => Some(Self::Fps60),
            _ => None,
        }
    }

    pub const fn discriminant(self) -> u8 {
        match self {
            Self::Fps23_976 => 0,
            Self::Fps24 => 1,
            Self::Fps25 => 2,
            Self::Fps29_97Df => 3,
            Self::Fps29_97Ndf => 4,
            Self::Fps30 => 5,
            Self::Fps48 => 6,
            Self::Fps50 => 7,
            Self::Fps59_94Df => 8,
            Self::Fps59_94Ndf => 9,
            Self::Fps60 => 10,
        }
    }

    pub fn from_discriminant(d: u8) -> Option<Self> {
        match d {
            0 => Some(Self::Fps23_976),
            1 => Some(Self::Fps24),
            2 => Some(Self::Fps25),
            3 => Some(Self::Fps29_97Df),
            4 => Some(Self::Fps29_97Ndf),
            5 => Some(Self::Fps30),
            6 => Some(Self::Fps48),
            7 => Some(Self::Fps50),
            8 => Some(Self::Fps59_94Df),
            9 => Some(Self::Fps59_94Ndf),
            10 => Some(Self::Fps60),
            _ => None,
        }
    }
}

impl fmt::Display for FrameRate {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Fps23_976 => write!(f, "23.976"),
            Self::Fps24 => write!(f, "24"),
            Self::Fps25 => write!(f, "25"),
            Self::Fps29_97Df => write!(f, "29.97df"),
            Self::Fps29_97Ndf => write!(f, "29.97"),
            Self::Fps30 => write!(f, "30"),
            Self::Fps48 => write!(f, "48"),
            Self::Fps50 => write!(f, "50"),
            Self::Fps59_94Df => write!(f, "59.94df"),
            Self::Fps59_94Ndf => write!(f, "59.94"),
            Self::Fps60 => write!(f, "60"),
        }
    }
}