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 "content/common/content_export.h"
  11 #include "content/public/browser/browser_message_filter.h"
  12 #include "content/public/browser/speech_recognition_event_listener.h"
  13 #include "content/public/common/speech_recognition_result.h"
  14 #include "net/url_request/url_request_context_getter.h"
  15
  16 struct InputTagSpeechHostMsg_StartRecognition_Params;
  17
  18 namespace content {
  19
  20 class SpeechRecognitionManager;
  21
  22 // InputTagSpeechDispatcherHost is a delegate for Speech API messages used by
  23 // RenderMessageFilter. Basically it acts as a proxy, relaying the events coming
  24 // from the SpeechRecognitionManager to IPC messages (and vice versa).
  25 // It's the complement of SpeechRecognitionDispatcher (owned by RenderView).
  26 class CONTENT_EXPORT InputTagSpeechDispatcherHost
  27     : public BrowserMessageFilter,
  28       public SpeechRecognitionEventListener {
  29  public:
  30   InputTagSpeechDispatcherHost(
  31       bool guest,
  32       int render_process_id,
  33       net::URLRequestContextGetter* url_request_context_getter);
  34
  35   // SpeechRecognitionEventListener methods.
  36   virtual void OnRecognitionStart(int session_id) OVERRIDE;
  37   virtual void OnAudioStart(int session_id) OVERRIDE;
  38   virtual void OnEnvironmentEstimationComplete(int session_id) OVERRIDE;
  39   virtual void OnSoundStart(int session_id) OVERRIDE;
  40   virtual void OnSoundEnd(int session_id) OVERRIDE;
  41   virtual void OnAudioEnd(int session_id) OVERRIDE;
  42   virtual void OnRecognitionEnd(int session_id) OVERRIDE;
  43   virtual void OnRecognitionResults(
  44       int session_id,
  45       const SpeechRecognitionResults& results) OVERRIDE;
  46   virtual void OnRecognitionError(
  47       int session_id,
  48       const SpeechRecognitionError& error) OVERRIDE;
  49   virtual void OnAudioLevelsChange(int session_id,
  50                                    float volume,
  51                                    float noise_volume) OVERRIDE;
  52
  53   // BrowserMessageFilter implementation.
  54   virtual bool OnMessageReceived(const IPC::Message& message,
  55                                  bool* message_was_ok) OVERRIDE;
  56   virtual void OverrideThreadForMessage(
  57       const IPC::Message& message,
  58       BrowserThread::ID* thread) OVERRIDE;
  59
  60  private:
  61   virtual ~InputTagSpeechDispatcherHost();
  62
  63   void OnStartRecognition(
  64       const InputTagSpeechHostMsg_StartRecognition_Params& params);
  65   void OnCancelRecognition(int render_view_id, int request_id);
  66   void OnStopRecording(int render_view_id, int request_id);
  67
  68   void StartRecognitionOnIO(
  69       int embedder_render_process_id,
  70       int embedder_render_view_id,
  71       const InputTagSpeechHostMsg_StartRecognition_Params& params,
  72       bool filter_profanities);
  73
  74   bool is_guest_;
  75   int render_process_id_;
  76   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
  77
  78   DISALLOW_COPY_AND_ASSIGN(InputTagSpeechDispatcherHost);
  79 };
  80
  81 }  // namespace content
  82
  83 #endif  // CONTENT_BROWSER_SPEECH_INPUT_TAG_SPEECH_DISPATCHER_HOST_H_