Adds volume level measurements to the AudioInputController for low-latency clients

content/browser/renderer_host/media/audio_input_renderer_host.cc

Index: content/browser/renderer_host/media/audio_input_renderer_host.cc
diff --git a/content/browser/renderer_host/media/audio_input_renderer_host.cc b/content/browser/renderer_host/media/audio_input_renderer_host.cc
index 107914a92106a2f9b4cba857a4adbe9dce3b230a..6659a313df3e2e45329206e2b345fa21e13ac87b 100644
--- a/content/browser/renderer_host/media/audio_input_renderer_host.cc
+++ b/content/browser/renderer_host/media/audio_input_renderer_host.cc
@@ -118,6 +118,16 @@ void AudioInputRendererHost::OnData(media::AudioInputController* controller,
   NOTREACHED() << "Only low-latency mode is supported.";
 }
 
+void AudioInputRendererHost::OnLog(media::AudioInputController* controller,
+                                   const std::string& message) {
+  BrowserThread::PostTask(BrowserThread::IO,
+                          FROM_HERE,
+                          base::Bind(&AudioInputRendererHost::DoLog,
+                                     this,
+                                     make_scoped_refptr(controller),
+                                     message));
+}
+
 void AudioInputRendererHost::DoCompleteCreation(
     media::AudioInputController* controller) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
@@ -205,6 +215,21 @@ void AudioInputRendererHost::DoHandleError(
   DeleteEntryOnError(entry, AUDIO_INPUT_CONTROLLER_ERROR);
 }
 
+void AudioInputRendererHost::DoLog(media::AudioInputController* controller,
+                                   const std::string& message) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  AudioEntry* entry = LookupByController(controller);
+  if (!entry)
+    return;

[no longer working on chromium, 2014/05/26 14:20:16]

In the AIC, you log when the stream is closed, so if you return here, it will
fail your intention.

Probably you do something like this:
std::string log_string = entry ?
base::StringPrintf("[stream_id=%d] ", entry->stream_id) :
"No corresponding stream"
log_string += message;
MediaStreamManager::SendMessageToNativeLog(log_string);

[henrika (OOO until Aug 14), 2014/05/26 15:01:17]

As discussed offline; will remove close logging in this CL.

+
+  // Add stream ID and current audio level reported bu AIC to native log.
+  std::string log_string =
+      base::StringPrintf("[stream_id=%d] ", entry->stream_id);
+  log_string += message;
+  MediaStreamManager::SendMessageToNativeLog(log_string);
+  DVLOG(1) << log_string;
+}
+
 bool AudioInputRendererHost::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(AudioInputRendererHost, message)