Android implementation of text-to-speech code for Web Speech Synthesis API

chrome/browser/speech/tts_android.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_SPEECH_TTS_ANDROID_H_
+#define CHROME_BROWSER_SPEECH_TTS_ANDROID_H_
+
+#include "base/android/jni_android.h"
+#include "base/android/scoped_java_ref.h"
+#include "chrome/browser/speech/tts_platform.h"
+
+class TtsPlatformImplAndroid : public TtsPlatformImpl {
+ public:
+  // TtsPlatformImpl implementation.
+  virtual bool PlatformImplAvailable() OVERRIDE {
+    return true;
+  }
+  virtual bool Speak(
+      int utterance_id,
+      const std::string& utterance,
+      const std::string& lang,
+      const VoiceData& voice,
+      const UtteranceContinuousParameters& params) OVERRIDE;
+  virtual bool StopSpeaking() OVERRIDE;
+  virtual bool IsSpeaking() OVERRIDE;
+  virtual void GetVoices(std::vector<VoiceData>* out_voices) OVERRIDE;
+
+  // Methods called from Java via JNI.
+  void VoicesChanged(JNIEnv* env, jobject obj);
+  void OnEndEvent(JNIEnv* env, jobject obj, jint utterance_id);
+  void OnErrorEvent(JNIEnv* env, jobject obj, jint utterance_id);
+  void OnStartEvent(JNIEnv* env, jobject obj, jint utterance_id);
+
+  // Static functions.
+  static TtsPlatformImplAndroid* GetInstance();
+  static bool Register(JNIEnv* env);
+
+ private:
+  friend struct DefaultSingletonTraits<TtsPlatformImplAndroid>;
+
+  TtsPlatformImplAndroid();
+  virtual ~TtsPlatformImplAndroid();
+
+  void SendFinalTtsEvent(
+      int utterance_id, TtsEventType event_type, int char_index);
+
+  base::android::ScopedJavaGlobalRef<jobject> java_ref_;
+  int utterance_id_;
+  std::string utterance_;
+
+  DISALLOW_COPY_AND_ASSIGN(TtsPlatformImplAndroid);
+};
+
+#endif  // CHROME_BROWSER_SPEECH_TTS_ANDROID_H_