Calculate the signal level on the media stream local audio track

content/renderer/media/webrtc/webrtc_local_audio_track_adapter.cc

 // 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.
 
 #include "content/renderer/media/webrtc/webrtc_local_audio_track_adapter.h"
 
 #include "base/logging.h"
 #include "content/renderer/media/webrtc_local_audio_track.h"
 
 namespace content {
 
 static const char kAudioTrackKind[] = "audio";
 
 scoped_refptr<WebRtcLocalAudioTrackAdapter>
 WebRtcLocalAudioTrackAdapter::Create(
     const std::string& label,
     webrtc::AudioSourceInterface* track_source) {
   talk_base::RefCountedObject<WebRtcLocalAudioTrackAdapter>* adapter =
       new talk_base::RefCountedObject<WebRtcLocalAudioTrackAdapter>(
           label, track_source);
   return adapter;
 }
 
 WebRtcLocalAudioTrackAdapter::WebRtcLocalAudioTrackAdapter(
     const std::string& label,
     webrtc::AudioSourceInterface* track_source)
     : webrtc::MediaStreamTrack<webrtc::AudioTrackInterface>(label),
       owner_(NULL),
-      track_source_(track_source) {
+      track_source_(track_source),
+      signal_level_(0) {
 }
 
 WebRtcLocalAudioTrackAdapter::~WebRtcLocalAudioTrackAdapter() {
 }
 
 void WebRtcLocalAudioTrackAdapter::Initialize(WebRtcLocalAudioTrack* owner) {
   DCHECK(!owner_);
   DCHECK(owner);
   owner_ = owner;
 }
 
 std::string WebRtcLocalAudioTrackAdapter::kind() const {
   return kAudioTrackKind;
 }
 
 std::vector<int> WebRtcLocalAudioTrackAdapter::VoeChannels() const {
   base::AutoLock auto_lock(lock_);
   return voe_channels_;
 }
 
+void WebRtcLocalAudioTrackAdapter::SetSignalLevel(int signal_level) {

[tommi (sloooow) - chröme, 2014/02/27 08:39:43]

document on which thread this is called?

[no longer working on chromium, 2014/02/28 08:16:25]

Done with adding a comment in the header file.

+  base::AutoLock auto_lock(lock_);
+  signal_level_ = signal_level;
+}
+
 void WebRtcLocalAudioTrackAdapter::AddChannel(int channel_id) {
   DVLOG(1) << "WebRtcLocalAudioTrack::AddChannel(channel_id="
            << channel_id << ")";
   base::AutoLock auto_lock(lock_);
   if (std::find(voe_channels_.begin(), voe_channels_.end(), channel_id) !=
       voe_channels_.end()) {
     // We need to handle the case when the same channel is connected to the
     // track more than once.
     return;
   }
@@ skipping 13 matching lines @@
 
 webrtc::AudioSourceInterface* WebRtcLocalAudioTrackAdapter::GetSource() const {
   return track_source_;
 }
 
 cricket::AudioRenderer* WebRtcLocalAudioTrackAdapter::GetRenderer() {
   return this;
 }
 
 }  // namespace content