chromium/chrome/browser/speech/extension_api/tts_engine_extension_api.h

// Copyright 2012 The Chromium Authors
// 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/values.h"
#include "content/public/browser/tts_controller.h"
#include "extensions/browser/extension_function.h"

namespace content {
class BrowserContext;
}

namespace tts_engine_events {
extern const char kOnSpeak[];
extern const char kOnSpeakWithAudioStream[];
extern const char kOnStop[];
extern const char kOnPause[];
extern const char kOnResume[];
}

// TtsEngineDelegate implementation used by TtsController.
class TtsExtensionEngine : public content::TtsEngineDelegate { … };

// Function that allows tts engines to update its list of supported voices at
// runtime.
class ExtensionTtsEngineUpdateVoicesFunction : public ExtensionFunction { … };

// 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 ExtensionFunction { … };

// Hidden/internal extension function used to allow TTS engine extensions
// to send audio back to the client that's calling tts.speak().
class ExtensionTtsEngineSendTtsAudioFunction : public ExtensionFunction { … };

#endif  // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_