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Freedom for Media in Java
There is a newer version: 1.0.2-jitsi
package com.ibm.media.codec.audio;

import javax.media.*;

/**
 * Implements an G723 Packetizer.
 */
public abstract class AudioPacketizer extends AudioCodec
{
    // //////////////////////////////////////////////////////////////////////////
    // Variables

    protected byte[] history;

    protected int packetSize;

    protected int historyLength;

    protected int sample_count;

    // protected long currentSeq = (long)
    // (System.currentTimeMillis() * Math.random() );

    // current timestamp on RTP format packets.
    // protected long timestamp = (long)
    // (System.currentTimeMillis() * Math.random() );

    // //////////////////////////////////////////////////////////////////////////
    // Methods
    public synchronized int process(Buffer inputBuffer, Buffer outputBuffer)
    {
        int inpLength = inputBuffer.getLength();
        int outLength = packetSize;

        byte[] inpData = (byte[]) inputBuffer.getData();
        byte[] outData = validateByteArraySize(outputBuffer, outLength);

        if (inpLength + historyLength >= packetSize)
        {
            int copyFromHistory = Math.min(historyLength, packetSize);

            System.arraycopy(history, 0, outData, 0, copyFromHistory);

            int remainingBytes = packetSize - copyFromHistory;
            System.arraycopy(inpData, inputBuffer.getOffset(), outData,
                    historyLength, remainingBytes);

            historyLength -= copyFromHistory;
            inputBuffer.setOffset(inputBuffer.getOffset() + remainingBytes);
            inputBuffer.setLength(inpLength - remainingBytes);

            // EP: packetizers will not convert time to RTP
            // units. This will be done in the RTP session manager and thus
            // processor will use the media times as is.
            // outputBuffer.setSequenceNumber(currentSeq++);
            // outputBuffer.setTimeStamp(timestamp);
            // timestamp+=sample_count;

            updateOutput(outputBuffer, outputFormat, outLength, 0);

            return INPUT_BUFFER_NOT_CONSUMED;
        }

        if (inputBuffer.isEOM())
        { // last packet

            System.arraycopy(history, 0, outData, 0, historyLength);
            System.arraycopy(inpData, inputBuffer.getOffset(), outData,
                    historyLength, inpLength);

            // EP: packetizers will not convert time to RTP
            // units. This will be done in the RTP session manager and thus
            // processor will use the media times as is.
            // outputBuffer.setSequenceNumber(currentSeq++);
            // outputBuffer.setTimeStamp(timestamp);
            // timestamp+=sample_count;

            updateOutput(outputBuffer, outputFormat, inpLength + historyLength,
                    0);

            historyLength = 0;

            return BUFFER_PROCESSED_OK;
        }

        // save remainder for next time
        System.arraycopy(inpData, inputBuffer.getOffset(), history,
                historyLength, inpLength);
        historyLength += inpLength;
        return OUTPUT_BUFFER_NOT_FILLED;
    }

    @Override
    public void reset()
    {
        historyLength = 0;
    }
}