chrome/browser/speech/tts_chromeos.cc

   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 #include "chrome/browser/speech/tts_platform.h"
   6
   7 // Chrome OS doesn't have native TTS, instead it includes a built-in
   8 // component extension that provides speech synthesis. This class includes
   9 // an implementation of LoadBuiltInTtsExtension and dummy implementations of
  10 // everything else.
  11
  12 class TtsPlatformImplChromeOs : public TtsPlatformImpl {
  13  public:
  14   // TtsPlatformImpl overrides:
  15   bool PlatformImplAvailable() override { return false; }
  16
  17   bool LoadBuiltInTtsExtension(
  18       content::BrowserContext* browser_context) override {
  19     TtsEngineDelegate* tts_engine_delegate =
  20         TtsController::GetInstance()->GetTtsEngineDelegate();
  21     if (tts_engine_delegate)
  22       return tts_engine_delegate->LoadBuiltInTtsExtension(browser_context);
  23     return false;
  24   }
  25
  26   bool Speak(int utterance_id,
  27              const std::string& utterance,
  28              const std::string& lang,
  29              const VoiceData& voice,
  30              const UtteranceContinuousParameters& params) override {
  31     return false;
  32   }
  33
  34   bool StopSpeaking() override { return false; }
  35
  36   void Pause() override {}
  37
  38   void Resume() override {}
  39
  40   bool IsSpeaking() override { return false; }
  41
  42   void GetVoices(std::vector<VoiceData>* out_voices) override {}
  43
  44   // Get the single instance of this class.
  45   static TtsPlatformImplChromeOs* GetInstance();
  46
  47  private:
  48   TtsPlatformImplChromeOs() {}
  49   ~TtsPlatformImplChromeOs() override {}
  50
  51   friend struct base::DefaultSingletonTraits<TtsPlatformImplChromeOs>;
  52
  53   DISALLOW_COPY_AND_ASSIGN(TtsPlatformImplChromeOs);
  54 };
  55
  56 // static
  57 TtsPlatformImpl* TtsPlatformImpl::GetInstance() {
  58   return TtsPlatformImplChromeOs::GetInstance();
  59 }
  60
  61 // static
  62 TtsPlatformImplChromeOs*
  63 TtsPlatformImplChromeOs::GetInstance() {
  64   return base::Singleton<TtsPlatformImplChromeOs>::get();
  65 }