1 // Copyright (c) 2013 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 CHROME_RENDERER_TTS_DISPATCHER_H_ 6 #define CHROME_RENDERER_TTS_DISPATCHER_H_ 7 8 #include <vector> 9 10 #include "base/basictypes.h" 11 #include "base/compiler_specific.h" 12 #include "base/containers/hash_tables.h" 13 #include "content/public/renderer/render_process_observer.h" 14 #include "third_party/WebKit/public/platform/WebSpeechSynthesizer.h" 15 #include "third_party/WebKit/public/platform/WebSpeechSynthesizerClient.h" 16 17 namespace IPC { 18 class Message; 19 } 20 21 struct TtsVoice; 22 23 // TtsDispatcher is a delegate for methods used by Blink for speech synthesis 24 // APIs. It's the complement of TtsDispatcherHost (owned by RenderViewHost). 25 // Each TtsDispatcher is owned by the WebSpeechSynthesizerClient in Blink; 26 // it registers itself to listen to IPC upon construction and unregisters 27 // itself when deleted. There can be multiple TtsDispatchers alive at once, 28 // so each one routes IPC messages to its WebSpeechSynthesizerClient only if 29 // the utterance id (which is globally unique) matches. 30 class TtsDispatcher 31 : public blink::WebSpeechSynthesizer, 32 public content::RenderProcessObserver { 33 public: 34 explicit TtsDispatcher(blink::WebSpeechSynthesizerClient* client); 35 36 private: 37 virtual ~TtsDispatcher(); 38 39 // RenderProcessObserver override. 40 virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE; 41 42 // blink::WebSpeechSynthesizer implementation. 43 virtual void updateVoiceList() OVERRIDE; 44 virtual void speak(const blink::WebSpeechSynthesisUtterance& utterance) 45 OVERRIDE; 46 virtual void pause() OVERRIDE; 47 virtual void resume() OVERRIDE; 48 virtual void cancel() OVERRIDE; 49 50 blink::WebSpeechSynthesisUtterance FindUtterance(int utterance_id); 51 52 void OnSetVoiceList(const std::vector<TtsVoice>& voices); 53 void OnDidStartSpeaking(int utterance_id); 54 void OnDidFinishSpeaking(int utterance_id); 55 void OnDidPauseSpeaking(int utterance_id); 56 void OnDidResumeSpeaking(int utterance_id); 57 void OnWordBoundary(int utterance_id, int char_index); 58 void OnSentenceBoundary(int utterance_id, int char_index); 59 void OnMarkerEvent(int utterance_id, int char_index); 60 void OnWasInterrupted(int utterance_id); 61 void OnWasCancelled(int utterance_id); 62 void OnSpeakingErrorOccurred(int utterance_id, 63 const std::string& error_message); 64 65 // The WebKit client class that we use to send events back to the JS world. 66 // Weak reference, this will be valid as long as this object exists. 67 blink::WebSpeechSynthesizerClient* synthesizer_client_; 68 69 // Next utterance id, used to map response IPCs to utterance objects. 70 static int next_utterance_id_; 71 72 // Map from id to utterance objects. 73 base::hash_map<int, blink::WebSpeechSynthesisUtterance> utterance_id_map_; 74 75 DISALLOW_COPY_AND_ASSIGN(TtsDispatcher); 76 }; 77 78 #endif // CHROME_RENDERER_TTS_DISPATCHER_H_ 79