content/browser/speech/speech_recognition_dispatcher_host.h

   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       bool is_guest,
  31       int render_process_id,
  32       net::URLRequestContextGetter* context_getter);
  33
  34   // SpeechRecognitionEventListener methods.
  35   virtual void OnRecognitionStart(int session_id) OVERRIDE;
  36   virtual void OnAudioStart(int session_id) OVERRIDE;
  37   virtual void OnEnvironmentEstimationComplete(int session_id) OVERRIDE;
  38   virtual void OnSoundStart(int session_id) OVERRIDE;
  39   virtual void OnSoundEnd(int session_id) OVERRIDE;
  40   virtual void OnAudioEnd(int session_id) OVERRIDE;
  41   virtual void OnRecognitionEnd(int session_id) OVERRIDE;
  42   virtual void OnRecognitionResults(
  43       int session_id,
  44       const SpeechRecognitionResults& results) OVERRIDE;
  45   virtual void OnRecognitionError(
  46       int session_id,
  47       const SpeechRecognitionError& error) OVERRIDE;
  48   virtual void OnAudioLevelsChange(int session_id,
  49                                    float volume,
  50                                    float noise_volume) OVERRIDE;
  51
  52   // BrowserMessageFilter implementation.
  53   virtual bool OnMessageReceived(const IPC::Message& message,
  54                                  bool* message_was_ok) OVERRIDE;
  55   virtual void OverrideThreadForMessage(
  56       const IPC::Message& message,
  57       BrowserThread::ID* thread) OVERRIDE;
  58
  59  private:
  60   virtual ~SpeechRecognitionDispatcherHost();
  61
  62   void OnStartRequest(
  63       const SpeechRecognitionHostMsg_StartRequest_Params& params);
  64   void OnStartRequestOnIO(
  65       int embedder_render_process_id,
  66       int embedder_render_view_id,
  67       const SpeechRecognitionHostMsg_StartRequest_Params& params,
  68       bool filter_profanities);
  69   void OnAbortRequest(int render_view_id, int request_id);
  70   void OnStopCaptureRequest(int render_view_id, int request_id);
  71
  72   bool is_guest_;
  73   int render_process_id_;
  74   scoped_refptr<net::URLRequestContextGetter> context_getter_;
  75
  76   DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionDispatcherHost);
  77 };
  78
  79 }  // namespace content
  80
  81 #endif  // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_