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 CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_ 6 #define CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_ 7 8 #include <vector> 9 10 #include "base/memory/singleton.h" 11 #include "chrome/browser/speech/tts_controller.h" 12 #include "extensions/browser/extension_function.h" 13 14 class Utterance; 15 16 namespace base { 17 class ListValue; 18 } 19 20 namespace extensions { 21 class Extension; 22 } 23 24 namespace tts_engine_events { 25 extern const char kOnSpeak[]; 26 extern const char kOnStop[]; 27 extern const char kOnPause[]; 28 extern const char kOnResume[]; 29 } 30 31 // Return a list of all available voices registered by extensions. 32 void GetExtensionVoices(Profile* profile, std::vector<VoiceData>* out_voices); 33 34 // Find the first extension with a tts_voices in its 35 // manifest that matches the speech parameters of this utterance. 36 // If found, store a pointer to the extension in |matching_extension| and 37 // the index of the voice within the extension in |voice_index| and 38 // return true. 39 bool GetMatchingExtensionVoice(Utterance* utterance, 40 const extensions::Extension** matching_extension, 41 size_t* voice_index); 42 43 // Speak the given utterance by sending an event to the given TTS engine 44 // extension voice. 45 void ExtensionTtsEngineSpeak(Utterance* utterance, 46 const VoiceData& voice); 47 48 // Stop speaking the given utterance by sending an event to the extension 49 // associated with this utterance. 50 void ExtensionTtsEngineStop(Utterance* utterance); 51 52 // Pause in the middle of speaking this utterance. 53 void ExtensionTtsEnginePause(Utterance* utterance); 54 55 // Resume speaking this utterance. 56 void ExtensionTtsEngineResume(Utterance* utterance); 57 58 // Hidden/internal extension function used to allow TTS engine extensions 59 // to send events back to the client that's calling tts.speak(). 60 class ExtensionTtsEngineSendTtsEventFunction : public SyncExtensionFunction { 61 private: ~ExtensionTtsEngineSendTtsEventFunction()62 virtual ~ExtensionTtsEngineSendTtsEventFunction() {} 63 virtual bool RunSync() OVERRIDE; 64 DECLARE_EXTENSION_FUNCTION("ttsEngine.sendTtsEvent", TTSENGINE_SENDTTSEVENT) 65 }; 66 67 #endif // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_ 68