1 // Copyright (c) 2011 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_CHROMEOS_CROS_SPEECH_SYNTHESIS_LIBRARY_H_ 6 #define CHROME_BROWSER_CHROMEOS_CROS_SPEECH_SYNTHESIS_LIBRARY_H_ 7 #pragma once 8 9 #include "base/memory/singleton.h" 10 11 namespace chromeos { 12 13 // This interface defines the interaction with the ChromeOS login library APIs. 14 class SpeechSynthesisLibrary { 15 public: 16 typedef void(*InitStatusCallback)(bool success); 17 ~SpeechSynthesisLibrary()18 virtual ~SpeechSynthesisLibrary() {} 19 20 // Speaks the specified text. 21 virtual bool Speak(const char* text) = 0; 22 23 // Sets options for the subsequent speech synthesis requests. 24 // Use the constants below. 25 virtual bool SetSpeakProperties(const char* props) = 0; 26 27 // Stops speaking the current utterance. 28 virtual bool StopSpeaking() = 0; 29 30 // Checks if the engine is currently speaking. 31 virtual bool IsSpeaking() = 0; 32 33 // Starts the speech synthesis service and indicates through a callback if 34 // it started successfully. 35 virtual void InitTts(InitStatusCallback) = 0; 36 37 // Factory function, creates a new instance and returns ownership. 38 // For normal usage, access the singleton via CrosLibrary::Get(). 39 static SpeechSynthesisLibrary* GetImpl(bool stub); 40 41 // Constants to be used with SetSpeakProperties. 42 static const char kSpeechPropertyLocale[]; 43 static const char kSpeechPropertyGender[]; 44 static const char kSpeechPropertyRate[]; 45 static const char kSpeechPropertyPitch[]; 46 static const char kSpeechPropertyVolume[]; 47 static const char kSpeechPropertyEquals[]; 48 static const char kSpeechPropertyDelimiter[]; 49 }; 50 51 } // namespace chromeos 52 53 #endif // CHROME_BROWSER_CHROMEOS_CROS_SPEECH_SYNTHESIS_LIBRARY_H_ 54