65 lines
1.4 KiB
Rust
65 lines
1.4 KiB
Rust
pub struct Upsampler<'a> {
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factor: u16,
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state: u16,
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iterator: Box<Iterator<Item=f32> + 'a>
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}
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impl<'a> Upsampler<'a> {
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pub fn from<I>(iterator: I, factor: u16) -> Upsampler<'a> where I: Iterator<Item=f32> + 'a {
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Upsampler {
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factor: factor,
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state: 0,
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iterator: Box::new(iterator)
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}
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}
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}
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impl<'a> Iterator for Upsampler<'a> {
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type Item = f32;
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fn next(&mut self) -> Option<Self::Item> {
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let result = if self.state == 0 {
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self.iterator.next()
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}
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else {
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Some(0.0)
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};
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self.state = (self.state + 1) % self.factor;
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return result;
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}
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}
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pub struct Downsampler<'a> {
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factor: u16,
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iterator: Box<Iterator<Item=f32> + 'a>
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}
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impl<'a> Downsampler<'a> {
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pub fn from<I>(iterator: I, factor: u16) -> Downsampler<'a> where I: Iterator<Item=f32> + 'a {
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Downsampler {
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factor: factor,
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iterator: Box::new(iterator)
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}
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}
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}
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impl<'a> Iterator for Downsampler<'a> {
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type Item = f32;
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fn next(&mut self) -> Option<Self::Item> {
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let mut result = 0.0;
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for _ in 0..self.factor {
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match self.iterator.next() {
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Some(x) => result += x,
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None => return None
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}
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}
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result /= self.factor as f32;
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return Some(result);
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}
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}
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