openexr 0.11.0

High-level bindings to OpenEXR 3.0.5
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
174
175
176
177
178
179
180
181
182
183
184

use openexr_sys as sys;

use crate::core::rational::Rational;

/// Get a [`Rational`] representing 23.976023... fps (24/1.001)
///
pub fn fps_23_976() -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_fps_23_976(
            &mut r as *mut Rational as *mut sys::Imf_Rational_t,
        )
        .into_result()
        .expect("Unexpected expection in fps_23_976");
    }
    r
}

/// Get a [`Rational`] representing 24 fps
///
pub fn fps_24() -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_fps_24(&mut r as *mut Rational as *mut sys::Imf_Rational_t)
            .into_result()
            .expect("Unexpected expection in fps_24");
    }
    r
}

/// Get a [`Rational`] representing 25 fps
///
pub fn fps_25() -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_fps_25(&mut r as *mut Rational as *mut sys::Imf_Rational_t)
            .into_result()
            .expect("Unexpected expection in fps_25");
    }
    r
}

/// Get a [`Rational`] representing 29.970029... fps (30/1.001)
///
pub fn fps_29_97() -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_fps_29_97(&mut r as *mut Rational as *mut sys::Imf_Rational_t)
            .into_result()
            .expect("Unexpected expection in fps_29_97");
    }
    r
}

/// Get a [`Rational`] representing 30 fps
///
pub fn fps_30() -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_fps_30(&mut r as *mut Rational as *mut sys::Imf_Rational_t)
            .into_result()
            .expect("Unexpected expection in fps_30");
    }
    r
}

/// Get a [`Rational`] representing 47.952047... fps (48/1.001)
///
pub fn fps_47_952() -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_fps_47_952(
            &mut r as *mut Rational as *mut sys::Imf_Rational_t,
        )
        .into_result()
        .expect("Unexpected expection in fps_47_952");
    }
    r
}

/// Get a [`Rational`] representing 48 fps
///
pub fn fps_48() -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_fps_48(&mut r as *mut Rational as *mut sys::Imf_Rational_t)
            .into_result()
            .expect("Unexpected expection in fps_48");
    }
    r
}

/// Get a [`Rational`] representing 50 fps
///
pub fn fps_50() -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_fps_50(&mut r as *mut Rational as *mut sys::Imf_Rational_t)
            .into_result()
            .expect("Unexpected expection in fps_50");
    }
    r
}

/// Get a [`Rational`] representing 59.940059... fps (60/1.001)
///
pub fn fps_59_94() -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_fps_59_94(&mut r as *mut Rational as *mut sys::Imf_Rational_t)
            .into_result()
            .expect("Unexpected expection in fps_59_94");
    }
    r
}

/// Get a [`Rational`] representing 60 fps
///
pub fn fps_60() -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_fps_60(&mut r as *mut Rational as *mut sys::Imf_Rational_t)
            .into_result()
            .expect("Unexpected expection in fps_60");
    }
    r
}

/// Tries to convert a floating-point frame rate to the nearest "good" frame
/// rate.
///
/// If none is close enough then it returns the closest rational approximation
/// to `fps`.
///
/// ```no_run
/// use openexr::core::Rational;
/// use openexr::core::frames_per_second::{guess_exact_fps_f64, fps_59_94};
///
/// assert_eq!(guess_exact_fps_f64(59.941), fps_59_94());
/// ```
///
pub fn guess_exact_fps_f64(fps: f64) -> Rational {
    let mut r = Rational::default();
    unsafe {
        sys::Imf_guessExactFps_f64(
            &mut r as *mut Rational as *mut sys::Imf_Rational_t,
            fps,
        )
        .into_result()
        .expect("Unexpected expection in guessExactFps_f64");
    }
    r
}

// TODO: can't get this to do anything useful
// pub fn guess_exact_fps(fps: Rational) -> Rational {
//     let mut r = Rational::default();
//     unsafe {
//         sys::Imf_guessExactFps(
//             &mut r as *mut Rational as *mut sys::Imf_Rational_t,
//             &fps as *const Rational as *const sys::Imf_Rational_t,
//         )
//         .into_result()
//         .expect("Unexpected expection in guessExactFps_f64");
//     }
//     r
// }

#[cfg(test)]
#[test]
fn test_fps() {
    assert_eq!(fps_23_976(), Rational::new(24000, 1001));
    assert_eq!(fps_24(), Rational::new(24, 1));
    assert_eq!(fps_25(), Rational::new(25, 1));
    assert_eq!(fps_29_97(), Rational::new(30000, 1001));
    assert_eq!(fps_30(), Rational::new(30, 1));
    assert_eq!(fps_47_952(), Rational::new(48000, 1001));
    assert_eq!(fps_48(), Rational::new(48, 1));
    assert_eq!(fps_50(), Rational::new(50, 1));
    assert_eq!(fps_59_94(), Rational::new(60000, 1001));
    assert_eq!(fps_60(), Rational::new(60, 1));

    assert_eq!(guess_exact_fps_f64(59.941), fps_59_94());
}