player: fix no sound bug

According to doc of rodio, the attached OutputStreamHandles will no
longer work after OutputStream is dropped. So player need to own
OutputStream. And currently there is no way to unstopped a Sink, so we
has no choice but to alloc a new Sink in player->start().

src/player/player.rs

@@ -36,6 +36,8 @@ pub struct Player {
     pub state: PlayerState,
     pub current: Option<Track>,
     pub sink: rodio::Sink,
+    pub stream: rodio::OutputStream,
+    pub stream_handle: rodio::OutputStreamHandle,
 }
 
 // player
@@ -57,7 +59,9 @@ impl Player {
         Player {
             state: PlayerState::Stopped,
             current: None,
-            sink: sink,
+            sink,
+            stream,
+            stream_handle,
             // endpoint: endpoint,
         }
     }
@@ -131,7 +135,7 @@ impl Player {
     pub fn start(&mut self) {
         let vol = self.sink.volume();
         self.sink.stop();
-        // self.sink = rodio::Sink::new(&self.endpoint);
+        self.sink = rodio::Sink::try_new(&self.stream_handle).unwrap();
         self.set_volume(vol);
     }