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SampleRateConverter: Document the various tests

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nicoo 2020-10-08 03:51:14 +02:00
parent 566e979203
commit 60e5450d2d
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1 changed files with 11 additions and 2 deletions
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13
src/conversions/sample_rate.rs
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@ -262,7 +262,8 @@ mod test {
}
quickcheck! {
fn zero(from: u32, to: u32, n: u16) -> () {
/// Check that resampling an empty input produces no output.
fn empty(from: u32, to: u32, n: u16) -> () {
let from = if from == 0 { return; } else { SampleRate(from) };
let to = if to == 0 { return; } else { SampleRate(to) };
if n == 0 { return; }
@ -275,6 +276,7 @@ mod test {
assert_eq!(output, []);
}
/// Check that resampling to the same rate does not change the signal.
fn identity(from: u32, n: u16, input: Vec<u16>) -> () {
let from = if from == 0 { return; } else { SampleRate(from) };
if n == 0 { return; }
@ -286,6 +288,8 @@ mod test {
assert_eq!(input, output);
}
/// Check that dividing the sample rate by k (integer) is the same as
/// dropping a sample from each channel.
fn divide_sample_rate(to: u32, k: u32, input: Vec<u16>, n: u16) -> () {
let to = if to == 0 { return; } else { SampleRate(to) };
let from = multiply_rate(to, k);
@ -308,6 +312,8 @@ mod test {
output)
}
/// Check that, after multiplying the sample rate by k, every k-th
/// sample in the output matches exactly with the input.
fn multiply_sample_rate(from: u32, k: u32, input: Vec<u16>, n: u16) -> () {
let from = if from == 0 { return; } else { SampleRate(from) };
let to = multiply_rate(from, k);
@ -332,7 +338,10 @@ mod test {
}
#[ignore]
fn equal_durations(d: Duration, freq: u32, to: u32) -> () {
/// Check that resampling does not change the audio duration,
/// except by a negligible amount (± 1ms). Reproduces #316.
/// Ignored, pending a bug fix.
fn preserve_durations(d: Duration, freq: u32, to: u32) -> () {
use crate::source::{SineWave, Source};
let to = if to == 0 { return; } else { SampleRate(to) };