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_extension_loader_chromeos.h"
   6 #include "chrome/browser/speech/tts_platform.h"
   7
   8 // Chrome OS doesn't have native TTS, instead it includes a built-in
   9 // component extension that provides speech synthesis. This class includes
  10 // an implementation of LoadBuiltInTtsExtension and dummy implementations of
  11 // everything else.
  12 class TtsPlatformImplChromeOs
  13     : public TtsPlatformImpl {
  14  public:
  15   // TtsPlatformImpl overrides:
  16   virtual bool PlatformImplAvailable() OVERRIDE {
  17     return false;
  18   }
  19
  20   virtual bool LoadBuiltInTtsExtension(Profile* profile) OVERRIDE {
  21     return TtsExtensionLoaderChromeOs::GetInstance(profile)->LoadTtsExtension();
  22   }
  23
  24   virtual bool Speak(
  25       int utterance_id,
  26       const std::string& utterance,
  27       const std::string& lang,
  28       const VoiceData& voice,
  29       const UtteranceContinuousParameters& params) OVERRIDE {
  30     return false;
  31   }
  32
  33   virtual bool StopSpeaking() OVERRIDE {
  34     return false;
  35   }
  36
  37   virtual void Pause() OVERRIDE {}
  38
  39   virtual void Resume() OVERRIDE {}
  40
  41   virtual bool IsSpeaking() OVERRIDE {
  42     return false;
  43   }
  44
  45   virtual void GetVoices(std::vector<VoiceData>* out_voices) OVERRIDE {
  46   }
  47
  48   // Get the single instance of this class.
  49   static TtsPlatformImplChromeOs* GetInstance();
  50
  51  private:
  52   TtsPlatformImplChromeOs() {}
  53   virtual ~TtsPlatformImplChromeOs() {}
  54
  55   friend struct DefaultSingletonTraits<TtsPlatformImplChromeOs>;
  56
  57   DISALLOW_COPY_AND_ASSIGN(TtsPlatformImplChromeOs);
  58 };
  59
  60 // static
  61 TtsPlatformImpl* TtsPlatformImpl::GetInstance() {
  62   return TtsPlatformImplChromeOs::GetInstance();
  63 }
  64
  65 // static
  66 TtsPlatformImplChromeOs*
  67 TtsPlatformImplChromeOs::GetInstance() {
  68   return Singleton<TtsPlatformImplChromeOs>::get();
  69 }