Add the option of compressing speech input audio using FLAC.

chrome/browser/speech/speech_recognizer.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_SPEECH_RECOGNIZER_H_
 #define CHROME_BROWSER_SPEECH_SPEECH_RECOGNIZER_H_
 
 #include <list>
 #include <string>
 #include <utility>
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
+#include "chrome/browser/speech/audio_encoder.h"
 #include "chrome/browser/speech/endpointer/endpointer.h"
 #include "chrome/browser/speech/speech_recognition_request.h"
 #include "media/audio/audio_input_controller.h"
 
 namespace speech_input {
 
-class SpeexEncoder;
-
 // Records audio, sends recorded audio to server and translates server response
 // to recognition result.
 class SpeechRecognizer
     : public base::RefCountedThreadSafe<SpeechRecognizer>,
       public media::AudioInputController::EventHandler,
       public SpeechRecognitionRequestDelegate {
  public:
   enum ErrorCode {
     RECOGNIZER_NO_ERROR,
     RECOGNIZER_ERROR_CAPTURE,
@@ skipping 89 matching lines @@
 
   // Handles OnData in the IO thread. Takes ownership of |data|.
   void HandleOnData(std::string* data);
 
   Delegate* delegate_;
   int caller_id_;
   std::string language_;
   std::string grammar_;
   std::string hardware_info_;
 
-  // Buffer holding the recorded audio. Owns the strings inside the list.
-  typedef std::list<std::string*> AudioBufferQueue;
-  AudioBufferQueue audio_buffers_;
-
   scoped_ptr<SpeechRecognitionRequest> request_;
   scoped_refptr<media::AudioInputController> audio_controller_;
-  scoped_ptr<SpeexEncoder> encoder_;
+  AudioEncoder::Codec codec_;
+  scoped_ptr<AudioEncoder> encoder_;
   Endpointer endpointer_;
   int num_samples_recorded_;
   float audio_level_;
 
   DISALLOW_COPY_AND_ASSIGN(SpeechRecognizer);
 };
 
 // This typedef is to workaround the issue with certain versions of
 // Visual Studio where it gets confused between multiple Delegate
 // classes and gives a C2500 error. (I saw this error on the try bots -
 // the workaround was not needed for my machine).
 typedef SpeechRecognizer::Delegate SpeechRecognizerDelegate;
 
 }  // namespace speech_input
 
 #endif  // CHROME_BROWSER_SPEECH_SPEECH_RECOGNIZER_H_