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      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_RENDERER_SPEECH_RECOGNITION_DISPATCHER_H_
      6 #define CONTENT_RENDERER_SPEECH_RECOGNITION_DISPATCHER_H_
      7 
      8 #include <map>
      9 
     10 #include "base/basictypes.h"
     11 #include "content/public/common/speech_recognition_result.h"
     12 #include "content/public/renderer/render_view_observer.h"
     13 #include "third_party/WebKit/public/platform/WebVector.h"
     14 #include "third_party/WebKit/public/web/WebSpeechRecognitionHandle.h"
     15 #include "third_party/WebKit/public/web/WebSpeechRecognizer.h"
     16 
     17 namespace content {
     18 class RenderViewImpl;
     19 struct SpeechRecognitionError;
     20 struct SpeechRecognitionResult;
     21 
     22 // SpeechRecognitionDispatcher is a delegate for methods used by WebKit for
     23 // scripted JS speech APIs. It's the complement of
     24 // SpeechRecognitionDispatcherHost (owned by RenderViewHost).
     25 class SpeechRecognitionDispatcher : public RenderViewObserver,
     26                                     public blink::WebSpeechRecognizer {
     27  public:
     28   explicit SpeechRecognitionDispatcher(RenderViewImpl* render_view);
     29   virtual ~SpeechRecognitionDispatcher();
     30 
     31   // Aborts all speech recognitions.
     32   void AbortAllRecognitions();
     33 
     34  private:
     35   // RenderViewObserver implementation.
     36   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
     37 
     38   // blink::WebSpeechRecognizer implementation.
     39   virtual void start(const blink::WebSpeechRecognitionHandle&,
     40                      const blink::WebSpeechRecognitionParams&,
     41                      blink::WebSpeechRecognizerClient*) OVERRIDE;
     42   virtual void stop(const blink::WebSpeechRecognitionHandle&,
     43                     blink::WebSpeechRecognizerClient*) OVERRIDE;
     44   virtual void abort(const blink::WebSpeechRecognitionHandle&,
     45                      blink::WebSpeechRecognizerClient*) OVERRIDE;
     46 
     47   void OnRecognitionStarted(int request_id);
     48   void OnAudioStarted(int request_id);
     49   void OnSoundStarted(int request_id);
     50   void OnSoundEnded(int request_id);
     51   void OnAudioEnded(int request_id);
     52   void OnErrorOccurred(int request_id, const SpeechRecognitionError& error);
     53   void OnRecognitionEnded(int request_id);
     54   void OnResultsRetrieved(int request_id,
     55                           const SpeechRecognitionResults& result);
     56 
     57   int GetOrCreateIDForHandle(const blink::WebSpeechRecognitionHandle& handle);
     58   bool HandleExists(const blink::WebSpeechRecognitionHandle& handle);
     59   const blink::WebSpeechRecognitionHandle& GetHandleFromID(int handle_id);
     60 
     61   // The WebKit client class that we use to send events back to the JS world.
     62   blink::WebSpeechRecognizerClient* recognizer_client_;
     63 
     64   typedef std::map<int, blink::WebSpeechRecognitionHandle> HandleMap;
     65   HandleMap handle_map_;
     66   int next_id_;
     67 
     68   DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionDispatcher);
     69 };
     70 
     71 }  // namespace content
     72 
     73 #endif  // CONTENT_RENDERER_SPEECH_RECOGNITION_DISPATCHER_H_
     74