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.
5 #ifndef CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_
6 #define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_
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"
15 struct SpeechRecognitionHostMsg_StartRequest_Params;
19 class SpeechRecognitionManager;
20 struct SpeechRecognitionResult;
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 {
30 SpeechRecognitionDispatcherHost(
31 int render_process_id,
32 net::URLRequestContextGetter* context_getter);
34 base::WeakPtr<SpeechRecognitionDispatcherHost> AsWeakPtr();
36 // SpeechRecognitionEventListener methods.
37 virtual void OnRecognitionStart(int session_id) OVERRIDE;
38 virtual void OnAudioStart(int session_id) OVERRIDE;
39 virtual void OnEnvironmentEstimationComplete(int session_id) OVERRIDE;
40 virtual void OnSoundStart(int session_id) OVERRIDE;
41 virtual void OnSoundEnd(int session_id) OVERRIDE;
42 virtual void OnAudioEnd(int session_id) OVERRIDE;
43 virtual void OnRecognitionEnd(int session_id) OVERRIDE;
44 virtual void OnRecognitionResults(
46 const SpeechRecognitionResults& results) OVERRIDE;
47 virtual void OnRecognitionError(
49 const SpeechRecognitionError& error) OVERRIDE;
50 virtual void OnAudioLevelsChange(int session_id,
52 float noise_volume) OVERRIDE;
54 // BrowserMessageFilter implementation.
55 virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
56 virtual void OverrideThreadForMessage(
57 const IPC::Message& message,
58 BrowserThread::ID* thread) OVERRIDE;
60 virtual void OnChannelClosing() OVERRIDE;
63 virtual ~SpeechRecognitionDispatcherHost();
66 const SpeechRecognitionHostMsg_StartRequest_Params& params);
67 void OnStartRequestOnIO(
68 int embedder_render_process_id,
69 int embedder_render_view_id,
70 const SpeechRecognitionHostMsg_StartRequest_Params& params,
71 bool filter_profanities);
72 void OnAbortRequest(int render_view_id, int request_id);
73 void OnStopCaptureRequest(int render_view_id, int request_id);
75 int render_process_id_;
76 scoped_refptr<net::URLRequestContextGetter> context_getter_;
78 // Used for posting asynchronous tasks (on the IO thread) without worrying
79 // about this class being destroyed in the meanwhile (due to browser shutdown)
80 // since tasks pending on a destroyed WeakPtr are automatically discarded.
81 base::WeakPtrFactory<SpeechRecognitionDispatcherHost> weak_factory_;
83 DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionDispatcherHost);
86 } // namespace content
88 #endif // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_