Support for remote audio into tracks

talk/app/webrtc/remoteaudiotrack.h

Index: talk/app/webrtc/remoteaudiotrack.h
diff --git a/talk/app/webrtc/remoteaudiotrack.h b/talk/app/webrtc/remoteaudiotrack.h
index 4ce4e792763e79a5f9f84fb98011054277375ae9..c9240ebf3ac3c4f6daa2a24698956a8c63e6626f 100644
--- a/talk/app/webrtc/remoteaudiotrack.h
+++ b/talk/app/webrtc/remoteaudiotrack.h
@@ -28,4 +28,50 @@
 #ifndef TALK_APP_WEBRTC_REMOTEAUDIOTRACK_H_
 #define TALK_APP_WEBRTC_REMOTEAUDIOTRACK_H_
 
+#include <string>
+
+#include "talk/app/webrtc/mediastreaminterface.h"
+#include "talk/app/webrtc/mediastreamtrack.h"
+#include "talk/app/webrtc/notifier.h"
+#include "webrtc/base/scoped_ptr.h"
+#include "webrtc/base/scoped_ref_ptr.h"
+
+namespace webrtc {
+
+class RemoteAudioSource;
+
+class RemoteAudioTrack : public MediaStreamTrack<AudioTrackInterface>,
+                         public ObserverInterface {
+ protected:
+  // Protected ctor to force use of factory method.
+  RemoteAudioTrack(const std::string& label,
+                   const rtc::scoped_refptr<RemoteAudioSource>& source);
+  ~RemoteAudioTrack() override;
+
+ public:
+  static rtc::scoped_refptr<RemoteAudioTrack> Create(
+      const std::string& id,
+      const rtc::scoped_refptr<RemoteAudioSource>& source);
+
+ private:
+  // MediaStreamTrack implementation.
+  std::string kind() const override;
+
+  // AudioTrackInterface implementation.
+  AudioSourceInterface* GetSource() const override;
+
+  void AddSink(AudioTrackSinkInterface* sink) override;
+  void RemoveSink(AudioTrackSinkInterface* sink) override;
+  bool GetSignalLevel(int* level) override;
+
+  // ObserverInterface implementation.
+  void OnChanged() override;
+
+ private:
+  const rtc::scoped_refptr<RemoteAudioSource> audio_source_;
+  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RemoteAudioTrack);
+};
+
+}  // namespace webrtc
+
 #endif  // TALK_APP_WEBRTC_REMOTEAUDIOTRACK_H_