add AudioStream struct

1 files changed, 39 insertions, 0 deletions

diff --git a/mumd/src/audio/input.rs b/mumd/src/audio/input.rs
index 914891b..01fd1f3 100644
--- a/mumd/src/audio/input.rs
+++ b/mumd/src/audio/input.rs
@@ -5,6 +5,10 @@ use std::collections::VecDeque;
 use std::sync::{Arc, Mutex};
 use tokio::sync::{mpsc, watch};
 use log::*;
+use futures::Stream;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+use futures_util::task::Waker;
 
 pub fn callback<T: Sample>(
     mut opus_encoder: opus::Encoder,
@@ -54,3 +58,38 @@ pub fn callback<T: Sample>(
         }
     }
 }
+
+struct AudioStream<T> {
+    data: Arc<Mutex<(VecDeque<T>, Option<Waker>)>>,
+}
+
+impl<T> AudioStream<T> {
+    fn new() -> Self {
+        Self {
+            data: Arc::new(Mutex::new((VecDeque::new(), None)))
+        }
+    }
+    
+    fn insert_sample(&self, sample: T) {
+        let mut data = self.data.lock().unwrap();
+        data.0.push_back(sample);
+        if let Some(waker) = data.1.take() {
+            waker.wake();
+        }
+    }
+}
+
+impl<T> Stream for AudioStream<T> {
+    type Item = T;
+
+    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        let s = self.get_mut();
+        let mut data = s.data.lock().unwrap();
+        if data.0.len() > 0 {
+            Poll::Ready(data.0.pop_front())
+        } else {
+            data.1 = Some(cx.waker().clone());
+            Poll::Pending
+        }
+    }
+}
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