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SampleRateConverter: Parameterize rate doubling by input data

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Nicolas Braud-Santoni 2020-10-01 16:44:24 +02:00
parent c5147cea07
commit 96e743746c
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GPG key ID: E6F98EE292D5ECCB
1 changed files with 25 additions and 7 deletions
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32
src/conversions/sample_rate.rs
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@ -285,28 +285,46 @@ mod test {
assert_eq!(input, output);
}
fn half_sample_rate(to: u32) -> () {
fn half_sample_rate(to: u32, input: Vec<u16>) -> () {
let to = if to == 0 { return; } else { SampleRate(to) };
let from = multiply_rate(to, 2);
let n = 2u16;
// Truncate the input, so it contains an integer number of frames.
let input = {
let ns = n as usize;
let mut i = input;
i.truncate(ns * (i.len() / ns));
i
};
let input = vec![1u16, 16, 2, 17, 3, 18, 4, 19, 5, 20, 6, 21];
let output =
SampleRateConverter::new(input.clone().into_iter(), from, to, n)
.collect::<Vec<_>>();
assert_eq!(output, [1, 16, 3, 18, 5, 20]);
assert_eq!(input.chunks_exact(n.into()).step_by(2).collect::<Vec<_>>().concat(),
output)
}
fn double_sample_rate(from: u32) -> () {
fn double_sample_rate(from: u32, input: Vec<u16>) -> () {
let from = if from == 0 { return; } else { SampleRate(from) };
let to = multiply_rate(from, 2);
let n = 2u16;
// Truncate the input, so it contains an integer number of frames.
let input = {
let ns = n as usize;
let mut i = input;
i.truncate(ns * (i.len() / ns));
i
};
let input = vec![2u16, 16, 4, 18, 6, 20, 8, 22];
let output =
SampleRateConverter::new(input.into_iter(), from, to, 2)
SampleRateConverter::new(input.clone().into_iter(), from, to, n)
.collect::<Vec<_>>();
assert_eq!(output, [2, 16, 3, 17, 4, 18, 5, 19, 6, 20, 7, 21, 8, 22]);
assert_eq!(input,
output.chunks_exact(n.into()).step_by(2).collect::<Vec<_>>().concat())
}
}