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use std::time::Duration;
use Sample;
use Source;
pub fn pausable<I>(source: I, paused: bool) -> Pausable<I>
where
I: Source,
I::Item: Sample,
{
let paused_channels = if paused {
Some(source.channels())
} else {
None
};
Pausable {
input: source,
paused_channels,
remaining_paused_samples: 0,
}
}
#[derive(Clone, Debug)]
pub struct Pausable<I> {
input: I,
paused_channels: Option<u16>,
remaining_paused_samples: u16,
}
impl<I> Pausable<I>
where
I: Source,
I::Item: Sample,
{
#[inline]
pub fn set_paused(&mut self, paused: bool) {
match (self.paused_channels, paused) {
(None, true) => self.paused_channels = Some(self.input.channels()),
(Some(_), false) => self.paused_channels = None,
_ => (),
}
}
#[inline]
pub fn inner(&self) -> &I {
&self.input
}
#[inline]
pub fn inner_mut(&mut self) -> &mut I {
&mut self.input
}
#[inline]
pub fn into_inner(self) -> I {
self.input
}
}
impl<I> Iterator for Pausable<I>
where
I: Source,
I::Item: Sample,
{
type Item = I::Item;
#[inline]
fn next(&mut self) -> Option<I::Item> {
if self.remaining_paused_samples > 0 {
self.remaining_paused_samples -= 1;
return Some(I::Item::zero_value());
}
if let Some(paused_channels) = self.paused_channels {
self.remaining_paused_samples = paused_channels - 1;
return Some(I::Item::zero_value());
}
self.input.next()
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.input.size_hint()
}
}
impl<I> Source for Pausable<I>
where
I: Source,
I::Item: Sample,
{
#[inline]
fn current_frame_len(&self) -> Option<usize> {
self.input.current_frame_len()
}
#[inline]
fn channels(&self) -> u16 {
self.input.channels()
}
#[inline]
fn sample_rate(&self) -> u32 {
self.input.sample_rate()
}
#[inline]
fn total_duration(&self) -> Option<Duration> {
self.input.total_duration()
}
}