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gstreamer-video: Add tests for previous/next fraction

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This commit is contained in:
Vivia Nikolaidou 2022-07-20 13:39:19 +03:00
parent 138bc71051
commit 751a5b4788
1 changed files with 51 additions and 2 deletions
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53
gstreamer-video/src/caps.rs
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@ -245,7 +245,12 @@ fn previous_fraction(fraction: gst::Fraction) -> gst::Fraction {
skip_assert_initialized!();
let num = fraction.numer();
let den = fraction.denom();
let (new_num, new_den, _, _) = farey_neighbours(num, den);
let (new_num, new_den);
if num < den {
(new_num, new_den, _, _) = farey_neighbours(num, den);
} else {
(_, _, new_den, new_num) = farey_neighbours(den, num);
}
gst::Fraction::new(new_num, new_den)
}
@ -253,6 +258,50 @@ fn next_fraction(fraction: gst::Fraction) -> gst::Fraction {
skip_assert_initialized!();
let num = fraction.numer();
let den = fraction.denom();
let (_, _, new_num, new_den) = farey_neighbours(num, den);
let (new_num, new_den);
if num < den {
(_, _, new_num, new_den) = farey_neighbours(num, den);
} else {
(new_den, new_num, _, _) = farey_neighbours(den, num);
}
gst::Fraction::new(new_num, new_den)
}
#[test]
fn test_0_1_fraction() {
gst::init().unwrap();
let zero_over_one = gst::Fraction::new(0, 1);
let prev = previous_fraction(zero_over_one);
assert_eq!(prev.numer(), -1);
assert_eq!(prev.denom(), i32::MAX);
let next = next_fraction(zero_over_one);
assert_eq!(next.numer(), 1);
assert_eq!(next.denom(), i32::MAX);
}
#[test]
fn test_25_1() {
gst::init().unwrap();
let twentyfive = gst::Fraction::new(25, 1);
let next = next_fraction(twentyfive);
//25.000000011641532
assert_eq!(next.numer(), 2147483626);
assert_eq!(next.denom(), 85899345);
let prev = previous_fraction(twentyfive);
//24.999999988358468
assert_eq!(prev.numer(), 2147483624);
assert_eq!(prev.denom(), 85899345);
}
#[test]
fn test_1_25() {
gst::init().unwrap();
let twentyfive = gst::Fraction::new(1, 25);
let next = next_fraction(twentyfive);
//0.040000000018626
assert_eq!(next.numer(), 85899345);
assert_eq!(next.denom(), 2147483624);
let prev = previous_fraction(twentyfive);
//0.039999999981374
assert_eq!(prev.numer(), 85899345);
assert_eq!(prev.denom(), 2147483626);
}