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   virtual bool PlatformImplAvailable() override {
  16     return false;
  17   }
  18
  19   virtual bool LoadBuiltInTtsExtension(
  20       content::BrowserContext* browser_context) override {
  21     TtsEngineDelegate* tts_engine_delegate =
  22         TtsController::GetInstance()->GetTtsEngineDelegate();
  23     if (tts_engine_delegate)
  24       return tts_engine_delegate->LoadBuiltInTtsExtension(browser_context);
  25     return false;
  26   }
  27
  28   virtual bool Speak(
  29       int utterance_id,
  30       const std::string& utterance,
  31       const std::string& lang,
  32       const VoiceData& voice,
  33       const UtteranceContinuousParameters& params) override {
  34     return false;
  35   }
  36
  37   virtual bool StopSpeaking() override {
  38     return false;
  39   }
  40
  41   virtual void Pause() override {}
  42
  43   virtual void Resume() override {}
  44
  45   virtual bool IsSpeaking() override {
  46     return false;
  47   }
  48
  49   virtual void GetVoices(std::vector<VoiceData>* out_voices) override {
  50   }
  51
  52   // Get the single instance of this class.
  53   static TtsPlatformImplChromeOs* GetInstance();
  54
  55  private:
  56   TtsPlatformImplChromeOs() {}
  57   virtual ~TtsPlatformImplChromeOs() {}
  58
  59   friend struct DefaultSingletonTraits<TtsPlatformImplChromeOs>;
  60
  61   DISALLOW_COPY_AND_ASSIGN(TtsPlatformImplChromeOs);
  62 };
  63
  64 // static
  65 TtsPlatformImpl* TtsPlatformImpl::GetInstance() {
  66   return TtsPlatformImplChromeOs::GetInstance();
  67 }
  68
  69 // static
  70 TtsPlatformImplChromeOs*
  71 TtsPlatformImplChromeOs::GetInstance() {
  72   return Singleton<TtsPlatformImplChromeOs>::get();
  73 }