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use std::cmp;
use std::time::Duration;
use source::uniform::UniformSourceIterator;
use Sample;
use Source;
pub fn mix<I1, I2>(input1: I1, input2: I2) -> Mix<I1, I2>
where I1: Source, I1::Item: Sample, I2: Source, I2::Item: Sample
{
let channels = input1.get_channels();
let rate = input1.get_samples_rate();
Mix {
input1: UniformSourceIterator::new(input1, channels, rate),
input2: UniformSourceIterator::new(input2, channels, rate),
}
}
#[derive(Clone)]
pub struct Mix<I1, I2> where I1: Source, I1::Item: Sample, I2: Source, I2::Item: Sample {
input1: UniformSourceIterator<I1, I1::Item>,
input2: UniformSourceIterator<I2, I1::Item>,
}
impl<I1, I2> Iterator for Mix<I1, I2> where I1: Source, I1::Item: Sample,
I2: Source, I2::Item: Sample
{
type Item = I1::Item;
#[inline]
fn next(&mut self) -> Option<I1::Item> {
let s1 = self.input1.next();
let s2 = self.input2.next();
match (s1, s2) {
(Some(s1), Some(s2)) => Some(Sample::lerp(s1, s2, 1, 2)),
(Some(s1), None) => Some(Sample::lerp(s1, Sample::zero_value(), 1, 2)),
(None, Some(s2)) => Some(Sample::lerp(s2, Sample::zero_value(), 1, 2)),
(None, None) => None,
}
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
let s1 = self.input1.size_hint();
let s2 = self.input2.size_hint();
let min = cmp::max(s1.0, s2.0);
let max = match (s1.1, s2.1) {
(Some(s1), Some(s2)) => Some(cmp::max(s1, s2)),
_ => None
};
(min, max)
}
}
impl<I1, I2> ExactSizeIterator for Mix<I1, I2>
where I1: Source + ExactSizeIterator, I1::Item: Sample,
I2: Source + ExactSizeIterator, I2::Item: Sample
{
}
impl<I1, I2> Source for Mix<I1, I2> where I1: Source, I1::Item: Sample,
I2: Source, I2::Item: Sample
{
#[inline]
fn get_current_frame_len(&self) -> Option<usize> {
let f1 = self.input1.get_current_frame_len();
let f2 = self.input2.get_current_frame_len();
match (f1, f2) {
(Some(f1), Some(f2)) => Some(cmp::min(f1, f2)),
_ => None,
}
}
#[inline]
fn get_channels(&self) -> u16 {
self.input1.get_channels()
}
#[inline]
fn get_samples_rate(&self) -> u32 {
self.input1.get_samples_rate()
}
#[inline]
fn get_total_duration(&self) -> Option<Duration> {
let f1 = self.input1.get_total_duration();
let f2 = self.input2.get_total_duration();
match (f1, f2) {
(Some(f1), Some(f2)) => Some(cmp::max(f1, f2)),
_ => None,
}
}
}