/*

 * 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.marvin.espeak;



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 {

	private SynthReadyCallback cb;

	

	public interface SynthReadyCallback{

		void onSynthReadyListener(short[] audioData);

	}

	

	//

	// External API

	//



	/**

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

	 */

	public SpeechSynthesis(SynthReadyCallback callback, String language,

			int languageVariant, int speechRate) {

		cb = callback;

		native_setup(new WeakReference<SpeechSynthesis>(this), language,

				languageVariant, speechRate);

	}



	/**

	 * Synthesize speech; results will be passed back to the TTS API using a

	 * callback.

	 */

	public native final void synth(String text);



	/**

	 * Stops synthesis

	 */

	public native final void stop();



	/**

	 * Sets the language

	 */

	public native final void setLanguage(String language, int languageVariant);



	/**

	 * Sets the speech rate

	 */

	public native final void setSpeechRate(int speechRate);



	//

	// Internal

	//



	static {

		System.loadLibrary("espeakengine");

	}



	private final static String TAG = "SpeechSynthesis";



	private int mNativeContext; // accessed by native methods



	private native final void native_setup(Object weak_this, String language,

			int languageVariant, int speechRate);



	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,

			short[] audioData) {

		SpeechSynthesis nativeTTS = (SpeechSynthesis) ((WeakReference) tts_ref)

				.get();

		nativeTTS.cb.onSynthReadyListener(audioData);

	}

}