Implement AudioReceiveStream::GetStats().

webrtc/audio/scoped_voe_interface.h

Index: webrtc/audio/scoped_voe_interface.h
diff --git a/webrtc/audio/scoped_voe_interface.h b/webrtc/audio/scoped_voe_interface.h
new file mode 100644
index 0000000000000000000000000000000000000000..10293372284e95729568521b01744bb4fc9a4a92
--- /dev/null
+++ b/webrtc/audio/scoped_voe_interface.h
@@ -0,0 +1,45 @@
+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_AUDIO_SCOPED_VOE_INTERFACE_H_
+#define WEBRTC_AUDIO_SCOPED_VOE_INTERFACE_H_
+
+#include "webrtc/base/checks.h"
+
+namespace webrtc {
+
+class VoiceEngine;
+
+namespace internal {
+
+// Utility template for obtaining and holding a reference to a VoiceEngine
+// interface and making sure it is released when this object goes out of scope.
+template<class T> class ScopedVoEInterface {
+ public:
+  explicit ScopedVoEInterface(webrtc::VoiceEngine* e)
+      : ptr_(T::GetInterface(e)) {
+    RTC_DCHECK(ptr_);
+  }
+  ~ScopedVoEInterface() {
+    if (ptr_) {
+      ptr_->Release();
+    }
+  }
+  T* operator->() {
+    RTC_DCHECK(ptr_);
+    return ptr_;
+  }
+ private:
+  T* ptr_;
+};
+}  // namespace internal
+}  // namespace webrtc
+
+#endif  // WEBRTC_AUDIO_SCOPED_VOE_INTERFACE_H_