/*

 * Copyright (C) 2008 Google Inc.

 * 

 * Licensed under the Apache License, Version 2.0 (the "License"); you may not

 * use this file except in compliance with the License. You may obtain a copy of

 * the License at

 * 

 * http://www.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT

 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the

 * License for the specific language governing permissions and limitations under

 * the License.

 */

package com.google.tts;



import android.util.Log;

import java.lang.ref.WeakReference;

import java.nio.ByteBuffer;





/**

 * The SpeechSynthesis class provides a high-level api to create and play

 * synthesized speech.

 * 

 * @author dmazzoni@gmail.com (Dominic Mazzoni)

 */

@SuppressWarnings("unused")

public class SpeechSynthesis {



  //

  // External API

  //



  /**

   * Constructor; pass a language code such as "en" for English.

   */

  public SpeechSynthesis(String nativeSoLib) {

    native_setup(new WeakReference<SpeechSynthesis>(this), nativeSoLib);

  }



  /**

   * Stops and clears the AudioTrack.

   */

  public native final void stop();



  /**

   * Synthesize speech and speak it directly using AudioTrack.

   */

  public native final void speak(String text);



  /**

   * Synthesize speech to a file. The current implementation writes a valid WAV

   * file to the given path, assuming it is writable. Something like

   * "/sdcard/???.wav" is recommended.

   */

  public native final void synthesizeToFile(String text, String filename);



  /**

   * Sets the language

   */

  public native final void setLanguage(String language);



  /**

   * Sets the speech rate

   */

  public native final void setSpeechRate(int speechRate);

  



  /**

   * Plays the given audio buffer

   */

  public native final void playAudioBuffer(int bufferPointer, int bufferSize);

  



  /**

   * Gets the currently set language

   */

  public native final String getLanguage();



  /**

   * Gets the currently set rate

   */

  public native final int getRate();



  /**

   * Shutsdown the native synthesizer

   */

  public native final void shutdown();



  //

  // Internal

  //



  static {

    System.loadLibrary("speechsynthesis");

  }



  private final static String TAG = "SpeechSynthesis";



  private int mNativeContext; // accessed by native methods



  private native final void native_setup(Object weak_this, String nativeSoLib);



  private native final void native_finalize();



  protected void finalize() {

    native_finalize();

  }

  

  /**

   * Callback from the C layer

   */

  @SuppressWarnings("unused")

  private static void postNativeSpeechSynthesizedInJava(Object tts_ref, int bufferPointer, int bufferSize){

	  Log.i("TTS plugin debug", "bufferPointer: " + bufferPointer + " bufferSize: " + bufferSize);

	  SpeechSynthesis nativeTTS = (SpeechSynthesis)((WeakReference)tts_ref).get();

	  nativeTTS.playAudioBuffer(bufferPointer, bufferSize);	  

  }

}