Speech input: Do environment estimation and detect the no-speech case.

chrome/browser/speech/endpointer/endpointer.h

 // Copyright (c) 2010 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 CHROME_BROWSER_SPEECH_ENDPOINTER_ENDPOINTER_H_
 #define CHROME_BROWSER_SPEECH_ENDPOINTER_ENDPOINTER_H_
 
 #include "base/basictypes.h"
 #include "chrome/browser/speech/endpointer/energy_endpointer.h"
 
@@ skipping 47 matching lines @@
   // input, e.g. by pressing a button.
   void SetUserInputMode();
 
   // Process a segment of audio, which may be more than one frame.
   // The status of the last frame will be returned.
   EpStatus ProcessAudio(const int16* audio_data, int num_samples);
 
   // Get the status of the endpointer.
   EpStatus Status(int64 *time_us);
 
+  // Returns true if the endpointer detected reasonable audio levels above
+  // background noise which could be user speech, false if not.
+  bool DidStartReceivingSpeech() const {
+    return speech_previously_detected_;
+  }
+
+  bool IsEstimatingEnvironment() const {
+    return energy_endpointer_.estimating_environment();
+  }
+
   void set_speech_input_complete_silence_length(int64 time_us) {
     speech_input_complete_silence_length_us_ = time_us;
   }
 
   void set_long_speech_input_complete_silence_length(int64 time_us) {
     long_speech_input_complete_silence_length_us_ = time_us;
   }
 
   void set_speech_input_possibly_complete_silence_length(int64 time_us) {
     speech_input_possibly_complete_silence_length_us_ = time_us;
@@ skipping 50 matching lines @@
   bool speech_previously_detected_;
   bool speech_input_complete_;
   EnergyEndpointer energy_endpointer_;
   int sample_rate_;
   int32 frame_size_;
 };
 
 }  // namespace speech_input
 
 #endif  // CHROME_BROWSER_SPEECH_ENDPOINTER_ENDPOINTER_H_