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Freedom for Media in Java
There is a newer version: 1.0.2-jitsi
package net.sf.fmj.media.codec.audio.gsm;

import javax.media.*;
import javax.media.format.*;

import net.sf.fmj.media.*;

/**
 * GSM/RTP packetizer Codec.
 *
 * @author Martin Harvan
 * @author Damian Minkov
 */
public class Packetizer extends AbstractPacketizer
{
    private static final int PACKET_SIZE = 33;

    // TODO: move to base class?
    protected Format[] outputFormats = new Format[] { new AudioFormat(
            AudioFormat.GSM_RTP, 8000, 8, 1, Format.NOT_SPECIFIED,
            AudioFormat.SIGNED, 264, Format.NOT_SPECIFIED, Format.byteArray) };

    public Packetizer()
    {
        super();
        this.inputFormats = new Format[] { new AudioFormat(AudioFormat.GSM,
                8000, 8, 1, Format.NOT_SPECIFIED, AudioFormat.SIGNED, 264,
                Format.NOT_SPECIFIED, Format.byteArray) };
    }

    @Override
    public void close()
    {
    }

    @Override
    public String getName()
    {
        return "GSM Packetizer";
    }

    @Override
    public Format[] getSupportedOutputFormats(Format input)
    {
        if (input == null)
            return outputFormats;
        else
        {
            if (!(input instanceof AudioFormat))
            {
                return new Format[] { null };
            }
            final AudioFormat inputCast = (AudioFormat) input;
            if (!inputCast.getEncoding().equals(AudioFormat.GSM)
                    || (inputCast.getSampleSizeInBits() != 8 && inputCast
                            .getSampleSizeInBits() != Format.NOT_SPECIFIED)
                    || (inputCast.getChannels() != 1 && inputCast.getChannels() != Format.NOT_SPECIFIED)
                    || (inputCast.getFrameSizeInBits() != 264 && inputCast
                            .getFrameSizeInBits() != Format.NOT_SPECIFIED))
            {
                return new Format[] { null };
            }
            final AudioFormat result = new AudioFormat(AudioFormat.GSM_RTP,
                    inputCast.getSampleRate(), 8, 1, inputCast.getEndian(),
                    inputCast.getSigned(), 264, inputCast.getFrameRate(),
                    inputCast.getDataType());

            return new Format[] { result };
        }
    }

    @Override
    public void open()
    {
        setPacketSize(PACKET_SIZE);
    }

    @Override
    public Format setInputFormat(Format f)
    {
        return super.setInputFormat(f);
    }

    @Override
    public Format setOutputFormat(Format f)
    {
        return super.setOutputFormat(f);
    }
}