Calculate the signal level on the media stream local audio track

content/renderer/media/webrtc/webrtc_local_audio_track_adapter.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_LOCAL_AUDIO_TRACK_ADAPTER_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_LOCAL_AUDIO_TRACK_ADAPTER_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 28 matching lines @@
   WebRtcLocalAudioTrackAdapter(
       const std::string& label,
       webrtc::AudioSourceInterface* track_source);
 
   virtual ~WebRtcLocalAudioTrackAdapter();
 
   void Initialize(WebRtcLocalAudioTrack* owner);
 
   std::vector<int> VoeChannels() const;
 
+  // Called on the audio thread by the WebRtcLocalAudioTrack to set the signal
+  // level of the audio data.
+  void SetSignalLevel(int signal_level);
+
  private:
   // webrtc::MediaStreamTrack implementation.
   virtual std::string kind() const OVERRIDE;
 
   // webrtc::AudioTrackInterface implementation.
   virtual void AddSink(webrtc::AudioTrackSinkInterface* sink) OVERRIDE;
   virtual void RemoveSink(webrtc::AudioTrackSinkInterface* sink) OVERRIDE;
 
   // cricket::AudioCapturer implementation.
   virtual void AddChannel(int channel_id) OVERRIDE;
@@ skipping 17 matching lines @@
   // from the audio track.
   ScopedVector<WebRtcAudioSinkAdapter> sink_adapters_;
 
   // Protects |voe_channels_|.
   mutable base::Lock lock_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_LOCAL_AUDIO_TRACK_ADAPTER_H_