feat: audio support (#45)

- Receive/Send audio frames
- LocalAudioTrack

livekit-webrtc/src/audio_stream.rs

@@ -0,0 +1,48 @@
+use crate::imp::audio_stream as stream_imp;
+
+#[cfg(not(target_arch = "wasm32"))]
+pub mod native {
+    use super::stream_imp;
+    use crate::audio_frame::AudioFrame;
+    use crate::media_stream::RtcAudioTrack;
+    use futures::stream::Stream;
+    use std::fmt::{Debug, Formatter};
+    use std::pin::Pin;
+    use std::task::{Context, Poll};
+
+    pub struct NativeAudioStream {
+        pub(crate) handle: stream_imp::NativeAudioStream,
+    }
+
+    impl Debug for NativeAudioStream {
+        fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+            f.debug_struct("NativeAudioStream")
+                .field("track", &self.track())
+                .finish()
+        }
+    }
+
+    impl NativeAudioStream {
+        pub fn new(audio_track: RtcAudioTrack) -> Self {
+            Self {
+                handle: stream_imp::NativeAudioStream::new(audio_track),
+            }
+        }
+
+        pub fn track(&self) -> RtcAudioTrack {
+            self.handle.track()
+        }
+
+        pub fn close(&mut self) {
+            self.handle.close()
+        }
+    }
+
+    impl Stream for NativeAudioStream {
+        type Item = AudioFrame;
+
+        fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
+            Pin::new(&mut self.get_mut().handle).poll_next(cx)
+        }
+    }
+}