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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_SPEECH_CHROME_SPEECH_RECOGNITION_MANAGER_DELEGATE_H_
      6 #define CHROME_BROWSER_SPEECH_CHROME_SPEECH_RECOGNITION_MANAGER_DELEGATE_H_
      7 
      8 #include "base/compiler_specific.h"
      9 #include "base/memory/ref_counted.h"
     10 #include "content/public/browser/speech_recognition_event_listener.h"
     11 #include "content/public/browser/speech_recognition_manager_delegate.h"
     12 #include "content/public/browser/speech_recognition_session_config.h"
     13 
     14 namespace speech {
     15 
     16 // This is Chrome's implementation of the SpeechRecognitionManagerDelegate
     17 // interface.
     18 class ChromeSpeechRecognitionManagerDelegate
     19     : public content::SpeechRecognitionManagerDelegate,
     20       public content::SpeechRecognitionEventListener {
     21  public:
     22   ChromeSpeechRecognitionManagerDelegate();
     23   virtual ~ChromeSpeechRecognitionManagerDelegate();
     24 
     25  protected:
     26   // SpeechRecognitionEventListener methods.
     27   virtual void OnRecognitionStart(int session_id) OVERRIDE;
     28   virtual void OnAudioStart(int session_id) OVERRIDE;
     29   virtual void OnEnvironmentEstimationComplete(int session_id) OVERRIDE;
     30   virtual void OnSoundStart(int session_id) OVERRIDE;
     31   virtual void OnSoundEnd(int session_id) OVERRIDE;
     32   virtual void OnAudioEnd(int session_id) OVERRIDE;
     33   virtual void OnRecognitionEnd(int session_id) OVERRIDE;
     34   virtual void OnRecognitionResults(
     35       int session_id, const content::SpeechRecognitionResults& result) OVERRIDE;
     36   virtual void OnRecognitionError(
     37       int session_id, const content::SpeechRecognitionError& error) OVERRIDE;
     38   virtual void OnAudioLevelsChange(int session_id, float volume,
     39                                    float noise_volume) OVERRIDE;
     40 
     41   // SpeechRecognitionManagerDelegate methods.
     42   virtual void GetDiagnosticInformation(bool* can_report_metrics,
     43                                         std::string* hardware_info) OVERRIDE;
     44   virtual void CheckRecognitionIsAllowed(
     45       int session_id,
     46       base::Callback<void(bool ask_user, bool is_allowed)> callback) OVERRIDE;
     47   virtual content::SpeechRecognitionEventListener* GetEventListener() OVERRIDE;
     48   virtual bool FilterProfanities(int render_process_id) OVERRIDE;
     49 
     50   // Callback called by |tab_watcher_| on the IO thread to signal tab closure.
     51   virtual void TabClosedCallback(int render_process_id, int render_view_id);
     52 
     53  private:
     54   class OptionalRequestInfo;
     55   class TabWatcher;
     56 
     57   // Checks for VIEW_TYPE_TAB_CONTENTS host in the UI thread and notifies back
     58   // the result in the IO thread through |callback|.
     59   static void CheckRenderViewType(
     60       base::Callback<void(bool ask_user, bool is_allowed)> callback,
     61       int render_process_id,
     62       int render_view_id);
     63 
     64   scoped_refptr<OptionalRequestInfo> optional_request_info_;
     65   scoped_refptr<TabWatcher> tab_watcher_;
     66 
     67   DISALLOW_COPY_AND_ASSIGN(ChromeSpeechRecognitionManagerDelegate);
     68 };
     69 
     70 }  // namespace speech
     71 
     72 #endif  // CHROME_BROWSER_SPEECH_CHROME_SPEECH_RECOGNITION_MANAGER_DELEGATE_H_
     73