src/content/browser/speech/input_tag_speech_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_INPUT_TAG_SPEECH_DISPATCHER_HOST_H_
   6 #define CONTENT_BROWSER_SPEECH_INPUT_TAG_SPEECH_DISPATCHER_HOST_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "content/common/content_export.h"
  12 #include "content/public/browser/browser_message_filter.h"
  13 #include "content/public/browser/speech_recognition_event_listener.h"
  14 #include "content/public/common/speech_recognition_result.h"
  15 #include "net/url_request/url_request_context_getter.h"
  16
  17 struct InputTagSpeechHostMsg_StartRecognition_Params;
  18
  19 namespace content {
  20
  21 class SpeechRecognitionManager;
  22
  23 // InputTagSpeechDispatcherHost is a delegate for Speech API messages used by
  24 // RenderMessageFilter. Basically it acts as a proxy, relaying the events coming
  25 // from the SpeechRecognitionManager to IPC messages (and vice versa).
  26 // It's the complement of SpeechRecognitionDispatcher (owned by RenderView).
  27 class CONTENT_EXPORT InputTagSpeechDispatcherHost
  28     : public BrowserMessageFilter,
  29       public SpeechRecognitionEventListener {
  30  public:
  31   InputTagSpeechDispatcherHost(
  32       bool guest,
  33       int render_process_id,
  34       net::URLRequestContextGetter* url_request_context_getter);
  35
  36   base::WeakPtr<InputTagSpeechDispatcherHost> AsWeakPtr();
  37
  38   // SpeechRecognitionEventListener methods.
  39   virtual void OnRecognitionStart(int session_id) OVERRIDE;
  40   virtual void OnAudioStart(int session_id) OVERRIDE;
  41   virtual void OnEnvironmentEstimationComplete(int session_id) OVERRIDE;
  42   virtual void OnSoundStart(int session_id) OVERRIDE;
  43   virtual void OnSoundEnd(int session_id) OVERRIDE;
  44   virtual void OnAudioEnd(int session_id) OVERRIDE;
  45   virtual void OnRecognitionEnd(int session_id) OVERRIDE;
  46   virtual void OnRecognitionResults(
  47       int session_id,
  48       const SpeechRecognitionResults& results) OVERRIDE;
  49   virtual void OnRecognitionError(
  50       int session_id,
  51       const SpeechRecognitionError& error) OVERRIDE;
  52   virtual void OnAudioLevelsChange(int session_id,
  53                                    float volume,
  54                                    float noise_volume) OVERRIDE;
  55
  56   // BrowserMessageFilter implementation.
  57   virtual bool OnMessageReceived(const IPC::Message& message,
  58                                  bool* message_was_ok) OVERRIDE;
  59   virtual void OverrideThreadForMessage(
  60       const IPC::Message& message,
  61       BrowserThread::ID* thread) OVERRIDE;
  62
  63   virtual void OnChannelClosing() OVERRIDE;
  64
  65  private:
  66   virtual ~InputTagSpeechDispatcherHost();
  67
  68   void OnStartRecognition(
  69       const InputTagSpeechHostMsg_StartRecognition_Params& params);
  70   void OnCancelRecognition(int render_view_id, int request_id);
  71   void OnStopRecording(int render_view_id, int request_id);
  72
  73   void StartRecognitionOnIO(
  74       int embedder_render_process_id,
  75       int embedder_render_view_id,
  76       const InputTagSpeechHostMsg_StartRecognition_Params& params,
  77       bool filter_profanities);
  78
  79   bool is_guest_;
  80   int render_process_id_;
  81   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
  82
  83   // Used for posting asynchronous tasks (on the IO thread) without worrying
  84   // about this class being destroyed in the meanwhile (due to browser shutdown)
  85   // since tasks pending on a destroyed WeakPtr are automatically discarded.
  86   base::WeakPtrFactory<InputTagSpeechDispatcherHost> weak_factory_;
  87
  88   DISALLOW_COPY_AND_ASSIGN(InputTagSpeechDispatcherHost);
  89 };
  90
  91 }  // namespace content
  92
  93 #endif  // CONTENT_BROWSER_SPEECH_INPUT_TAG_SPEECH_DISPATCHER_HOST_H_