/*

 * Copyright (C) 2009 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.media.AudioManager; // import android.media.AudioSystem;

import android.util.Log;

import java.lang.ref.WeakReference;



/**

 * @hide

 * 

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

 *       synthesized speech. This class is used internally to talk to a native

 *       TTS library that implements the interface defined in

 *       frameworks/base/include/tts/TtsEngine.h

 * 

 */

@SuppressWarnings("unused")

public class SynthProxyBeta {



  //

  // External API

  //



  /**

   * Constructor; pass the location of the native TTS .so to use.

   */

  public SynthProxyBeta(String nativeSoLib) {

    Log.e("TTS is loading", nativeSoLib);

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

  }



  /**

   * Stops and clears the AudioTrack.

   */

  public int stop() {

    return native_stop(mJniData);

  }



  /**

   * Synthesize speech and speak it directly using AudioTrack.

   */

  public int speak(String text, int streamType) {

    // The following line should really be:

    // if ((streamType > -1) && (streamType < AudioSystem.getNumStreamTypes()))

    // {

    // but AudioSystem is not exposed publically.

    // Hardcoding it to "5" as that is what that call currently returns.

    if ((streamType > -1) && (streamType < 5)) {

      return native_speak(mJniData, text, streamType);

    } else {

      Log.e("SynthProxy", "Trying to speak with invalid stream type " + streamType);

      return native_speak(mJniData, text, AudioManager.STREAM_MUSIC);

    }

  }



  /**

   * 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 int synthesizeToFile(String text, String filename) {

    return native_synthesizeToFile(mJniData, text, filename);

  }



  /**

   * Queries for language support. Return codes are defined in

   * android.speech.tts.TextToSpeech

   */

  public int isLanguageAvailable(String language, String country, String variant) {

    return native_isLanguageAvailable(mJniData, language, country, variant);

  }



  /**

   * Sets the language.

   */

  public int setLanguage(String language, String country, String variant) {

    return native_setLanguage(mJniData, language, country, variant);

  }



  /**

   * Loads the language: it's not set, but prepared for use later.

   */

  public int loadLanguage(String language, String country, String variant) {

    return native_loadLanguage(mJniData, language, country, variant);

  }



  /**

   * Sets the speech rate.

   */

  public final int setSpeechRate(int speechRate) {

    return native_setSpeechRate(mJniData, speechRate);

  }



  /**

   * Sets the pitch of the synthesized voice.

   */

  public final int setPitch(int pitch) {

    return native_setPitch(mJniData, pitch);

  }



  /**

   * Returns the currently set language, country and variant information.

   */

  public String[] getLanguage() {

    return native_getLanguage(mJniData);

  }



  /**

   * Gets the currently set rate.

   */

  public int getRate() {

    return native_getRate(mJniData);

  }



  /**

   * Shuts down the native synthesizer.

   */

  public void shutdown() {

    native_shutdown(mJniData);

  }



  //

  // Internal

  //



  @Override

  protected void finalize() {

    native_finalize(mJniData);

    mJniData = 0;

  }



  static {

    // System.loadLibrary("ttssynthproxy");

    String proxyBinaryFilename = "ttssynthproxybeta";

    int sdkInt = 4;

    try {

      sdkInt = Integer.parseInt(android.os.Build.VERSION.SDK);

    } catch (NumberFormatException e) {

      Log.e("SynthProxyBeta", "Unable to parse SDK version: " + android.os.Build.VERSION.SDK);

    }

    if (sdkInt > 4) {

      proxyBinaryFilename = "ttssynthproxybeta_eclair";

    }

    System.loadLibrary(proxyBinaryFilename);

  }



  private final static String TAG = "SynthProxy";



  /**

   * Accessed by native methods

   */

  private int mJniData = 0;



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



  private native final void native_finalize(int jniData);



  private native final int native_stop(int jniData);



  private native final int native_speak(int jniData, String text, int streamType);



  private native final int native_synthesizeToFile(int jniData, String text, String filename);



  private native final int native_isLanguageAvailable(int jniData, String language, String country,

      String variant);



  private native final int native_setLanguage(int jniData, String language, String country,

      String variant);



  private native final int native_loadLanguage(int jniData, String language, String country,

      String variant);



  private native final int native_setSpeechRate(int jniData, int speechRate);



  private native final int native_setPitch(int jniData, int speechRate);



  private native final String[] native_getLanguage(int jniData);



  private native final int native_getRate(int jniData);



  private native final void native_shutdown(int jniData);



  private native final int native_stopSync(int jniData);



  /**

   * 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);



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

    // TODO notify TTS service of synthesis/playback completion,

    // method definition to be changed.

  }

}