src/content/renderer/speech_recognition_dispatcher.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_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 "base/memory/scoped_ptr.h"
  12 #include "base/memory/shared_memory.h"
  13 #include "base/sync_socket.h"
  14 #include "content/public/common/speech_recognition_result.h"
  15 #include "content/public/renderer/render_view_observer.h"
  16 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
  17 #include "third_party/WebKit/public/platform/WebVector.h"
  18 #include "third_party/WebKit/public/web/WebSpeechRecognitionHandle.h"
  19 #include "third_party/WebKit/public/web/WebSpeechRecognizer.h"
  20
  21 namespace media {
  22 class AudioParameters;
  23 }
  24
  25 namespace content {
  26 class RenderViewImpl;
  27 #if defined(ENABLE_WEBRTC)
  28 class SpeechRecognitionAudioSink;
  29 #endif
  30 struct SpeechRecognitionError;
  31 struct SpeechRecognitionResult;
  32
  33 // SpeechRecognitionDispatcher is a delegate for methods used by WebKit for
  34 // scripted JS speech APIs. It's the complement of
  35 // SpeechRecognitionDispatcherHost (owned by RenderViewHost).
  36 class SpeechRecognitionDispatcher : public RenderViewObserver,
  37                                     public blink::WebSpeechRecognizer {
  38  public:
  39   explicit SpeechRecognitionDispatcher(RenderViewImpl* render_view);
  40   virtual ~SpeechRecognitionDispatcher();
  41
  42   // Aborts all speech recognitions.
  43   void AbortAllRecognitions();
  44
  45  private:
  46   // RenderViewObserver implementation.
  47   bool OnMessageReceived(const IPC::Message& message) override;
  48
  49   // blink::WebSpeechRecognizer implementation.
  50   virtual void start(const blink::WebSpeechRecognitionHandle&,
  51                      const blink::WebSpeechRecognitionParams&,
  52                      blink::WebSpeechRecognizerClient*);
  53   virtual void stop(const blink::WebSpeechRecognitionHandle&,
  54                     blink::WebSpeechRecognizerClient*);
  55   virtual void abort(const blink::WebSpeechRecognitionHandle&,
  56                      blink::WebSpeechRecognizerClient*);
  57
  58   void OnRecognitionStarted(int request_id);
  59   void OnAudioStarted(int request_id);
  60   void OnSoundStarted(int request_id);
  61   void OnSoundEnded(int request_id);
  62   void OnAudioEnded(int request_id);
  63   void OnErrorOccurred(int request_id, const SpeechRecognitionError& error);
  64   void OnRecognitionEnded(int request_id);
  65   void OnResultsRetrieved(int request_id,
  66                           const SpeechRecognitionResults& result);
  67   void OnAudioReceiverReady(int session_id,
  68                              const media::AudioParameters& params,
  69                              const base::SharedMemoryHandle handle,
  70                              const base::SyncSocket::TransitDescriptor socket);
  71
  72   void ResetAudioSink();
  73
  74   int GetOrCreateIDForHandle(const blink::WebSpeechRecognitionHandle& handle);
  75   bool HandleExists(const blink::WebSpeechRecognitionHandle& handle);
  76   const blink::WebSpeechRecognitionHandle& GetHandleFromID(int handle_id);
  77
  78   // The WebKit client class that we use to send events back to the JS world.
  79   blink::WebSpeechRecognizerClient* recognizer_client_;
  80
  81 #if defined(ENABLE_WEBRTC)
  82   // Media stream audio track that the speech recognition connects to.
  83   // Accessed on the render thread.
  84   blink::WebMediaStreamTrack audio_track_;
  85
  86   // Audio sink used to provide audio from the track.
  87   scoped_ptr<SpeechRecognitionAudioSink> speech_audio_sink_;
  88 #endif
  89
  90   typedef std::map<int, blink::WebSpeechRecognitionHandle> HandleMap;
  91   HandleMap handle_map_;
  92   int next_id_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionDispatcher);
  95 };
  96
  97 }  // namespace content
  98
  99 #endif  // CONTENT_RENDERER_SPEECH_RECOGNITION_DISPATCHER_H_