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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 "base/memory/singleton.h"
#include "chrome/browser/extensions/extension_function.h"
class Extension;
class Utterance;
namespace base {
class ListValue;
}
// Return a list of all available voices registered by extensions.
void GetExtensionVoices(Profile* profile, base::ListValue* result_voices);
// Find the first extension with a tts_voices in its
// manifest that matches the speech parameters of this utterance.
// If found, store a pointer to the extension in |matching_extension| and
// the index of the voice within the extension in |voice_index| and
// return true.
bool GetMatchingExtensionVoice(Utterance* utterance,
const Extension** matching_extension,
size_t* voice_index);
// Speak the given utterance by sending an event to the given TTS engine
// extension voice.
void ExtensionTtsEngineSpeak(Utterance* utterance,
const Extension* extension,
size_t voice_index);
// Stop speaking the given utterance by sending an event to the extension
// associated with this utterance.
void ExtensionTtsEngineStop(Utterance* utterance);
// 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:
virtual ~ExtensionTtsEngineSendTtsEventFunction() {}
virtual bool RunImpl() OVERRIDE;
DECLARE_EXTENSION_FUNCTION_NAME("ttsEngine.sendTtsEvent")
};
#endif // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
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