feat: audio support (#45)

- Receive/Send audio frames
- LocalAudioTrack

livekit-webrtc/src/audio_source.rs

@@ -0,0 +1,25 @@
+use crate::imp::audio_source as imp_as;
+
+#[cfg(not(target_arch = "wasm32"))]
+pub mod native {
+    use super::imp_as;
+    use crate::audio_frame::AudioFrame;
+    use std::fmt::{Debug, Formatter};
+
+    #[derive(Default, Clone)]
+    pub struct NativeAudioSource {
+        pub(crate) handle: imp_as::NativeAudioSource,
+    }
+
+    impl Debug for NativeAudioSource {
+        fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+            f.debug_struct("NativeAudioSource").finish()
+        }
+    }
+
+    impl NativeAudioSource {
+        pub fn capture_frame(&self, frame: AudioFrame) {
+            self.handle.capture_frame(frame)
+        }
+    }
+}