I need to write an MP3 encoder code using java

/*
* LAMEOnJ Java based API for LAME MP3 encoder
*
* Copyright (c) 2006 Jose Maria Arranz
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/

package test.com.innowhere.lameonj;

import com.innowhere.jnieasy.core.JNIEasy;
import com.innowhere.jnieasy.core.data.NativeInteger;
import com.innowhere.jnieasy.core.typedec.NativeTypeManager;
import com.innowhere.jnieasy.core.util.NativeCapableFactory;
import com.innowhere.lame.BE_CONFIG;
import com.innowhere.lame.BE_VERSION;
import com.innowhere.lame.BladeMP3EncDLL;
import com.innowhere.lameonj.BeConfigLHV1;
import com.innowhere.lameonj.BeVersion;
import com.innowhere.lameonj.LAMEOnJ;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

/**
*
* @author jmarranz
*/

public class Test
{

/** Creates a new instance of Test */
public Test()
{
}

public static void main(String[] args) throws Exception
{
String wavFile = args[0];
String mp3File = args[2];

JNIEasy.get().load();

testPlainAPI(wavFile,mp3File);
testOOPAPI(wavFile,mp3File);
}

public static void testPlainAPI(String wavFile,String mp3File) throws Exception
{
// Based in the LAME example : Dll/Example.cpp

new File(mp3File).delete();

NativeTypeManager typeMgr = JNIEasy.get().getTypeManager();

BE_VERSION version = new BE_VERSION();
BladeMP3EncDLL.beVersion(version);
System.out.println("LAME Version: " + version.getByMajorVersion() + "." + version.getByMinorVersion());
System.out.println("Home page: " + version.getZHomepageAsString());

BE_CONFIG beConfig = new BE_CONFIG();
JNIEasy.get().getNativeManager().makeNative(beConfig); // Necessary NOW is a union

beConfig.setDwConfig(BladeMP3EncDLL.BE_CONFIG_LAME);
beConfig.getFormat().getLHV1().setDwStructVersion(1);
beConfig.getFormat().getLHV1().setDwStructSize((int)typeMgr.sizeOf(BE_CONFIG.class));
beConfig.getFormat().getLHV1().setDwSampleRate(44100);
beConfig.getFormat().getLHV1().setDwReSampleRate(0); // NO RESAMPLE
beConfig.getFormat().getLHV1().setNMode(BladeMP3EncDLL.BE_MP3_MODE_JSTEREO);
beConfig.getFormat().getLHV1().setDwBitrate(128);
//beConfig.getFormat().getLHV1().setNPreset(LAME_QUALITY_PRESET.LQP_R3MIX);
beConfig.getFormat().getLHV1().setDwMpegVersion(BladeMP3EncDLL.MPEG1);
beConfig.getFormat().getLHV1().setDwPsyModel(0); // USE DEFAULT PSYCHOACOUSTIC MODEL
beConfig.getFormat().getLHV1().setDwEmphasis(0); // NO EMPHASIS TURNED ON
beConfig.getFormat().getLHV1().setBOriginal(true);
beConfig.getFormat().getLHV1().setBWriteVBRHeader(true); // Write INFO tag
beConfig.getFormat().getLHV1().setBNoRes(true);

NativeCapableFactory factory = JNIEasy.get().getNativeCapableFactory();
NativeInteger pDwSamples = factory.newNativeInteger(0);
NativeInteger pDwMP3Buffer = factory.newNativeInteger(0);
NativeInteger pHbeStream = factory.newNativeInteger(0);

int err = BladeMP3EncDLL.beInitStream(beConfig,pDwSamples,pDwMP3Buffer,pHbeStream);
checkError(err);

int dwSamples = pDwSamples.getIntValue();
int dwMP3Buffer = pDwMP3Buffer.getIntValue();
int hbeStream = pHbeStream.getIntValue();

// Allocate buffers
byte[] pMP3Buffer = new byte[dwMP3Buffer];
//short[] pWAVBuffer = new short[dwSamples];
byte[] pWAVBuffer = new byte[dwSamples * 2];

// WAV file supposed 44100 Hz, Stereo, 16 bits
BufferedInputStream wavStream = new BufferedInputStream(new FileInputStream(wavFile));
BufferedOutputStream mp3Stream = new BufferedOutputStream(new FileOutputStream(mp3File));

wavStream.skip(44); // Skipping the WAV header

NativeInteger pDwWrite = factory.newNativeInteger(0);
int dwWrite;
// Convert All PCM samples
int read = 0;
while ((read = wavStream.read(pWAVBuffer,0,pWAVBuffer.length)) > 0)
{
// Encode (stereo) samples
err = BladeMP3EncDLL.beEncodeChunk(hbeStream, read / 2, pWAVBuffer, pMP3Buffer, pDwWrite);
checkError(err);

// write dwWrite bytes that are returned in tehe pMP3Buffer to disk
dwWrite = pDwWrite.getIntValue();
mp3Stream.write(pMP3Buffer,0,dwWrite);
}

// Deinit the stream
err = BladeMP3EncDLL.beDeinitStream(hbeStream, pMP3Buffer, pDwWrite);
checkError(err);

// Are there any bytes returned from the DeInit call?
// If so, write them to disk
dwWrite = pDwWrite.getIntValue();
if( dwWrite != 0 )
mp3Stream.write(pMP3Buffer,0,dwWrite);

// close the MP3 Stream
BladeMP3EncDLL.beCloseStream( hbeStream );

BladeMP3EncDLL.beWriteVBRHeader(mp3File);

wavStream.close();
mp3Stream.close();
}

public static void testOOPAPI(String wavFile,String mp3File) throws Exception
{
// Based in the LAME example : Dll/Example.cpp

new File(mp3File).delete();

NativeTypeManager typeMgr = JNIEasy.get().getTypeManager();

LAMEOnJ lame = LAMEOnJ.get();

BeVersion version = lame.getVersion();
System.out.println("LAME Version: " + version.getByMajorVersion() + "." + version.getByMinorVersion());
System.out.println("Home page: " + version.getZHomepageAsString());

BeConfigLHV1 beConfig = lame.newBeConfigLHV1();

beConfig.setDwSampleRate(44100);
beConfig.setDwReSampleRate(0); // NO RESAMPLE
beConfig.setNMode(BladeMP3EncDLL.BE_MP3_MODE_JSTEREO);
beConfig.setDwBitrate(128);
//beConfig.setNPreset(LAME_QUALITY_PRESET.LQP_R3MIX);
beConfig.setDwMpegVersion(BladeMP3EncDLL.MPEG1);
beConfig.setDwPsyModel(0); // USE DEFAULT PSYCHOACOUSTIC MODEL
beConfig.setDwEmphasis(0); // NO EMPHASIS TURNED ON
beConfig.setBOriginal(true);
beConfig.setBWriteVBRHeader(true); // Write INFO tag
beConfig.setBNoRes(true);

lame.encode(wavFile,mp3File,beConfig,true);
}

public static void checkError(int err)
{
if (err != BladeMP3EncDLL.BE_ERR_SUCCESSFUL)
throw new RuntimeException("ERROR " + err);
}
}

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