import	java.io.IOException;
import	java.io.File;

import	javax.sound.sampled.AudioFileFormat;
import	javax.sound.sampled.AudioFormat;
import	javax.sound.sampled.AudioInputStream;
import	javax.sound.sampled.AudioSystem;

// not portable, but cannot be avoided currently
import	org.tritonus.share.sampled.AudioFileTypes;
import	org.tritonus.share.sampled.Encodings;



public class GSMEncoder
{
	public static void main(String[] args)
	{
		if (args.length != 2)
		{
			printUsageAndExit();
		}
		File	pcmFile = new File(args[0]);
		File	gsmFile = new File(args[1]);
		AudioInputStream	ais = null;
		try
		{
			ais = AudioSystem.getAudioInputStream(pcmFile);
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
		if (ais == null)
		{
			System.out.println("cannot open audio file");
			System.exit(1);
		}
		AudioFormat.Encoding	targetEncoding = Encodings.getEncoding("GSM0610");
		AudioInputStream	gsmAIS = AudioSystem.getAudioInputStream(targetEncoding, ais);
		AudioFileFormat.Type	fileType = AudioFileTypes.getType("GSM", ".gsm");
		int	nWrittenFrames = 0;
		try
		{
			nWrittenFrames = AudioSystem.write(gsmAIS, fileType, gsmFile);
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
	}



	private static void printUsageAndExit()
	{
			System.out.println("GSMEncoder: usage:");
			System.out.println("\tjava GSMEncoder <pcmfile> <gsmfile>");
			System.exit(1);
	}
}



/*** GSMEncoder.java ***/