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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 CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
#define CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
#include <vector>
#include "base/memory/singleton.h"
#include "chrome/browser/speech/tts_controller.h"
#include "extensions/browser/extension_function.h"
class Utterance;
namespace base {
class ListValue;
}
namespace content {
class BrowserContext;
}
namespace extensions {
class Extension;
}
namespace tts_engine_events {
extern const char kOnSpeak[];
extern const char kOnStop[];
extern const char kOnPause[];
extern const char kOnResume[];
}
// TtsEngineDelegate implementation used by TtsController.
class TtsExtensionEngine : public TtsEngineDelegate {
public:
static TtsExtensionEngine* GetInstance();
// Overridden from TtsEngineDelegate:
void GetVoices(content::BrowserContext* browser_context,
std::vector<VoiceData>* out_voices) override;
void Speak(Utterance* utterance, const VoiceData& voice) override;
void Stop(Utterance* utterance) override;
void Pause(Utterance* utterance) override;
void Resume(Utterance* utterance) override;
bool LoadBuiltInTtsExtension(
content::BrowserContext* browser_context) override;
};
// Hidden/internal extension function used to allow TTS engine extensions
// to send events back to the client that's calling tts.speak().
class ExtensionTtsEngineSendTtsEventFunction : public SyncExtensionFunction {
private:
~ExtensionTtsEngineSendTtsEventFunction() override {}
bool RunSync() override;
DECLARE_EXTENSION_FUNCTION("ttsEngine.sendTtsEvent", TTSENGINE_SENDTTSEVENT)
};
#endif // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
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