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use std::sync::atomic::{AtomicUsize, Ordering};
use crate::{Controlled, Filter, Signal};
const PLAY: usize = 0;
const PAUSE: usize = 1;
const STOP: usize = 2;
pub struct Stop<T: ?Sized> {
state: AtomicUsize,
inner: T,
}
impl<T> Stop<T> {
pub(crate) fn new(signal: T) -> Self {
Self {
state: AtomicUsize::new(PLAY),
inner: signal,
}
}
}
impl<T: ?Sized> Stop<T> {
pub(crate) fn stop(&self) {
self.state.store(STOP, Ordering::Relaxed);
}
pub(crate) fn is_paused(&self) -> bool {
self.state.load(Ordering::Relaxed) == PAUSE
}
pub(crate) fn is_stopped(&self) -> bool {
self.state.load(Ordering::Relaxed) == STOP
}
}
impl<T: Signal + ?Sized> Signal for Stop<T> {
type Frame = T::Frame;
fn sample(&self, interval: f32, out: &mut [T::Frame]) {
self.inner.sample(interval, out);
}
fn remaining(&self) -> f32 {
let state = self.state.load(Ordering::Relaxed);
match state {
PLAY => self.inner.remaining(),
PAUSE => f32::INFINITY,
_ => 0.0,
}
}
}
impl<T> Filter for Stop<T> {
type Inner = T;
fn inner(&self) -> &T {
&self.inner
}
}
#[derive(Copy, Clone)]
pub struct StopControl<'a, T>(&'a Stop<T>);
unsafe impl<'a, T: 'a> Controlled<'a> for Stop<T> {
type Control = StopControl<'a, T>;
unsafe fn make_control(signal: &'a Stop<T>) -> Self::Control {
StopControl(signal)
}
}
impl<'a, T> StopControl<'a, T> {
pub fn pause(&self) {
self.0.state.store(PAUSE, Ordering::Relaxed);
}
pub fn resume(&self) {
self.0.state.store(PLAY, Ordering::Relaxed);
}
pub fn stop(&self) {
self.0.state.store(STOP, Ordering::Relaxed);
}
pub fn is_paused(&self) -> bool {
self.0.state.load(Ordering::Relaxed) == PAUSE
}
pub fn is_stopped(&self) -> bool {
self.0.state.load(Ordering::Relaxed) == STOP
}
}