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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 CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_
      6 #define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_
      7 
      8 #include "base/memory/scoped_ptr.h"
      9 #include "content/common/content_export.h"
     10 #include "content/public/browser/browser_message_filter.h"
     11 #include "content/public/browser/speech_recognition_event_listener.h"
     12 #include "net/url_request/url_request_context_getter.h"
     13 
     14 struct SpeechRecognitionHostMsg_StartRequest_Params;
     15 
     16 namespace content {
     17 
     18 class SpeechRecognitionManager;
     19 struct SpeechRecognitionResult;
     20 
     21 // SpeechRecognitionDispatcherHost is a delegate for Speech API messages used by
     22 // RenderMessageFilter. Basically it acts as a proxy, relaying the events coming
     23 // from the SpeechRecognitionManager to IPC messages (and vice versa).
     24 // It's the complement of SpeechRecognitionDispatcher (owned by RenderView).
     25 class CONTENT_EXPORT SpeechRecognitionDispatcherHost
     26     : public BrowserMessageFilter,
     27       public SpeechRecognitionEventListener {
     28  public:
     29   SpeechRecognitionDispatcherHost(
     30       int render_process_id,
     31       net::URLRequestContextGetter* context_getter);
     32 
     33   // SpeechRecognitionEventListener methods.
     34   virtual void OnRecognitionStart(int session_id) OVERRIDE;
     35   virtual void OnAudioStart(int session_id) OVERRIDE;
     36   virtual void OnEnvironmentEstimationComplete(int session_id) OVERRIDE;
     37   virtual void OnSoundStart(int session_id) OVERRIDE;
     38   virtual void OnSoundEnd(int session_id) OVERRIDE;
     39   virtual void OnAudioEnd(int session_id) OVERRIDE;
     40   virtual void OnRecognitionEnd(int session_id) OVERRIDE;
     41   virtual void OnRecognitionResults(
     42       int session_id,
     43       const SpeechRecognitionResults& results) OVERRIDE;
     44   virtual void OnRecognitionError(
     45       int session_id,
     46       const SpeechRecognitionError& error) OVERRIDE;
     47   virtual void OnAudioLevelsChange(int session_id,
     48                                    float volume,
     49                                    float noise_volume) OVERRIDE;
     50 
     51   // BrowserMessageFilter implementation.
     52   virtual bool OnMessageReceived(const IPC::Message& message,
     53                                  bool* message_was_ok) OVERRIDE;
     54   virtual void OverrideThreadForMessage(
     55       const IPC::Message& message,
     56       BrowserThread::ID* thread) OVERRIDE;
     57 
     58  private:
     59   virtual ~SpeechRecognitionDispatcherHost();
     60 
     61   void OnStartRequest(
     62       const SpeechRecognitionHostMsg_StartRequest_Params& params);
     63   void OnStartRequestOnIO(
     64       const SpeechRecognitionHostMsg_StartRequest_Params& params,
     65       bool filter_profanities);
     66   void OnAbortRequest(int render_view_id, int request_id);
     67   void OnStopCaptureRequest(int render_view_id, int request_id);
     68 
     69   int render_process_id_;
     70   scoped_refptr<net::URLRequestContextGetter> context_getter_;
     71 
     72   DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionDispatcherHost);
     73 };
     74 
     75 }  // namespace content
     76 
     77 #endif  // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_
     78