Add a noise indicator to the speech bubble volume indicator.

content/browser/speech/endpointer/energy_endpointer.cc

Index: content/browser/speech/endpointer/energy_endpointer.cc
diff --git a/content/browser/speech/endpointer/energy_endpointer.cc b/content/browser/speech/endpointer/energy_endpointer.cc
index c806aedd0b5c79eb96b8d349725d9e9e60348593..c7a7ccbeee15d4e7a7fc93bae36825c6c29876cf 100644
--- a/content/browser/speech/endpointer/energy_endpointer.cc
+++ b/content/browser/speech/endpointer/energy_endpointer.cc
@@ -327,12 +327,19 @@ void EnergyEndpointer::ProcessAudioFrame(int64 time_us,
   ++frame_counter_;
 
   if (rms_out) {
-    *rms_out = -120.0;
-    if ((noise_level_ > 0.0) && ((rms / noise_level_ ) > 0.000001))
-      *rms_out = static_cast<float>(20.0 * log10(rms / noise_level_));
+    *rms_out = -2000.0;
+    if (rms > 1.0e-100)

[bulach, 2011/03/01 17:39:04]

again, it may be nicer to define these magic consts with names..

+      *rms_out = 20 * log10(rms);
   }
 }
 
+float EnergyEndpointer::GetNoiseLevelDB() const {
+  float levelDB = -2000.0;
+  if (noise_level_ > 1.0e-100)
+    levelDB = 20 * log10(noise_level_);
+  return levelDB;

[bulach, 2011/03/01 17:39:04]

ditto, dB and named constants..

+}
+
 void EnergyEndpointer::UpdateLevels(float rms) {
   // Update quickly initially. We assume this is noise and that
   // speech is 6dB above the noise.