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 "base/memory/weak_ptr.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 "net/url_request/url_request_context_getter.h" 14 15 struct SpeechRecognitionHostMsg_StartRequest_Params; 16 17 namespace content { 18 19 class SpeechRecognitionManager; 20 struct SpeechRecognitionResult; 21 22 // SpeechRecognitionDispatcherHost 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 SpeechRecognitionDispatcherHost 27 : public BrowserMessageFilter, 28 public SpeechRecognitionEventListener { 29 public: 30 SpeechRecognitionDispatcherHost( 31 bool is_guest, 32 int render_process_id, 33 net::URLRequestContextGetter* context_getter); 34 35 base::WeakPtr<SpeechRecognitionDispatcherHost> AsWeakPtr(); 36 37 // SpeechRecognitionEventListener methods. 38 virtual void OnRecognitionStart(int session_id) OVERRIDE; 39 virtual void OnAudioStart(int session_id) OVERRIDE; 40 virtual void OnEnvironmentEstimationComplete(int session_id) OVERRIDE; 41 virtual void OnSoundStart(int session_id) OVERRIDE; 42 virtual void OnSoundEnd(int session_id) OVERRIDE; 43 virtual void OnAudioEnd(int session_id) OVERRIDE; 44 virtual void OnRecognitionEnd(int session_id) OVERRIDE; 45 virtual void OnRecognitionResults( 46 int session_id, 47 const SpeechRecognitionResults& results) OVERRIDE; 48 virtual void OnRecognitionError( 49 int session_id, 50 const SpeechRecognitionError& error) OVERRIDE; 51 virtual void OnAudioLevelsChange(int session_id, 52 float volume, 53 float noise_volume) OVERRIDE; 54 55 // BrowserMessageFilter implementation. 56 virtual bool OnMessageReceived(const IPC::Message& message, 57 bool* message_was_ok) OVERRIDE; 58 virtual void OverrideThreadForMessage( 59 const IPC::Message& message, 60 BrowserThread::ID* thread) OVERRIDE; 61 62 virtual void OnChannelClosing() OVERRIDE; 63 64 private: 65 virtual ~SpeechRecognitionDispatcherHost(); 66 67 void OnStartRequest( 68 const SpeechRecognitionHostMsg_StartRequest_Params& params); 69 void OnStartRequestOnIO( 70 int embedder_render_process_id, 71 int embedder_render_view_id, 72 const SpeechRecognitionHostMsg_StartRequest_Params& params, 73 bool filter_profanities); 74 void OnAbortRequest(int render_view_id, int request_id); 75 void OnStopCaptureRequest(int render_view_id, int request_id); 76 77 bool is_guest_; 78 int render_process_id_; 79 scoped_refptr<net::URLRequestContextGetter> context_getter_; 80 81 // Used for posting asynchronous tasks (on the IO thread) without worrying 82 // about this class being destroyed in the meanwhile (due to browser shutdown) 83 // since tasks pending on a destroyed WeakPtr are automatically discarded. 84 base::WeakPtrFactory<SpeechRecognitionDispatcherHost> weak_factory_; 85 86 DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionDispatcherHost); 87 }; 88 89 } // namespace content 90 91 #endif // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_ 92
