1// Copyright (c) 2012 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_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
6#define CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
7
8#include <vector>
9
10#include "base/memory/singleton.h"
11#include "chrome/browser/speech/tts_controller.h"
12#include "extensions/browser/extension_function.h"
13
14class Utterance;
15
16namespace base {
17class ListValue;
18}
19
20namespace content {
21class BrowserContext;
22}
23
24namespace extensions {
25class Extension;
26}
27
28namespace tts_engine_events {
29extern const char kOnSpeak[];
30extern const char kOnStop[];
31extern const char kOnPause[];
32extern const char kOnResume[];
33}
34
35// TtsEngineDelegate implementation used by TtsController.
36class TtsExtensionEngine : public TtsEngineDelegate {
37 public:
38  static TtsExtensionEngine* GetInstance();
39
40  // Overridden from TtsEngineDelegate:
41  virtual void GetVoices(content::BrowserContext* browser_context,
42                         std::vector<VoiceData>* out_voices) OVERRIDE;
43  virtual void Speak(Utterance* utterance, const VoiceData& voice) OVERRIDE;
44  virtual void Stop(Utterance* utterance) OVERRIDE;
45  virtual void Pause(Utterance* utterance) OVERRIDE;
46  virtual void Resume(Utterance* utterance) OVERRIDE;
47  virtual bool LoadBuiltInTtsExtension(
48      content::BrowserContext* browser_context) OVERRIDE;
49};
50// Hidden/internal extension function used to allow TTS engine extensions
51// to send events back to the client that's calling tts.speak().
52class ExtensionTtsEngineSendTtsEventFunction : public SyncExtensionFunction {
53 private:
54  virtual ~ExtensionTtsEngineSendTtsEventFunction() {}
55  virtual bool RunSync() OVERRIDE;
56  DECLARE_EXTENSION_FUNCTION("ttsEngine.sendTtsEvent", TTSENGINE_SENDTTSEVENT)
57};
58
59#endif  // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
60