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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_DBUS_SPEECH_SYNTHESIZER_CLIENT_H_
#define CHROMEOS_DBUS_SPEECH_SYNTHESIZER_CLIENT_H_
#pragma once
#include <string>
#include "base/callback.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/dbus/dbus_client_implementation_type.h"
namespace dbus {
class Bus;
}
namespace chromeos {
// SpeechSynthesizerClient is used to communicate with the speech synthesizer.
// All method should be called from the origin thread (UI thread) which
// initializes the DBusThreadManager instance.
class CHROMEOS_EXPORT SpeechSynthesizerClient {
public:
// A callback function called when the result of IsSpeaking is ready.
// The argument indicates if the speech synthesizer is speaking or not.
typedef base::Callback<void(bool)> IsSpeakingCallback;
virtual ~SpeechSynthesizerClient();
// Speaks the specified text with properties.
// Use the constants below for properties.
// An example of |properties|: "rate=1.0 pitch=1.0"
virtual void Speak(const std::string& text,
const std::string& properties) = 0;
// Stops speaking the current utterance.
virtual void StopSpeaking() = 0;
// Checks if the engine is currently speaking.
// |callback| will be called on the origin thread later with the result.
virtual void IsSpeaking(const IsSpeakingCallback& callback) = 0;
// Factory function, creates a new instance and returns ownership.
// For normal usage, access the singleton via DBusThreadManager::Get().
static SpeechSynthesizerClient* Create(DBusClientImplementationType type,
dbus::Bus* bus);
// Constants to be used with the properties argument to Speak.
static const char kSpeechPropertyLocale[];
static const char kSpeechPropertyGender[];
static const char kSpeechPropertyRate[];
static const char kSpeechPropertyPitch[];
static const char kSpeechPropertyVolume[];
static const char kSpeechPropertyEquals[];
static const char kSpeechPropertyDelimiter[];
protected:
// Create() should be used instead.
SpeechSynthesizerClient();
private:
DISALLOW_COPY_AND_ASSIGN(SpeechSynthesizerClient);
};
} // namespace chromeos
#endif // CHROMEOS_DBUS_SPEECH_SYNTHESIZER_CLIENT_H_
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