Problem with the examples of Transmitting and Receiving Custom RTP Payloads

Question

I have tried the examples of this web:
http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/CustomPayload.html
Transmitting and Receiving Custom RTP Payloads
I run the examples all right.
But I want to transmit the sound using my own format, so i want to change the file PcmPacketizer.java
and PcmDepacketizer.java
I think the sound data is in the byte[] inData ---- {byte[] inData = (byte[])inBuf.getData();}
so i change the data with my own function, so the inData have the diffrent length:
then i transmit the data with the packet header
public synchronized int process(Buffer inBuf, Buffer outBuf) {
int inLength = inBuf.getLength();
byte[] inData = (enbase((byte[])inBuf.getData()));
byte[] outData = (byte[])outBuf.getData();
     if (outData == null || outData.length < PACKET_SIZE) {
     outData = new byte[PACKET_SIZE];
     outBuf.setData(outData);
     // Generate the packet header.
     int rate = (int)inFormat.getSampleRate();
     int size = (int)inFormat.getSampleSizeInBits();
     int channels = (int)inFormat.getChannels();
     outData[0] = 0;     // filler
     outData[1] = (byte)((rate >> 16) & 0xff);
     outData[2] = (byte)((rate >> 8) & 0xff);
     outData[3] = (byte)(rate & 0xff);
     outData[4] = (byte)inFormat.getSampleSizeInBits();
     outData[5] = (byte)inFormat.getChannels();
     outData[6] = (byte)inFormat.getEndian();
     outData[7] = (byte)inFormat.getSigned();
     int frameSize = inFormat.getSampleSizeInBits() * inFormat.getChannels();
     // Recompute the output format if the input format has changed.
     // The crucial info is the frame rate and size. These are used
     // to compute the actual rate the data being sent.
     if (rate != (int)outFormat.getFrameRate() ||
     frameSize != outFormat.getFrameSizeInBits()) {
          outFormat = new AudioFormat(CUSTOM_PCM,
                    AudioFormat.NOT_SPECIFIED, // rate
                    AudioFormat.NOT_SPECIFIED, // size
                    AudioFormat.NOT_SPECIFIED, // channel
                    AudioFormat.NOT_SPECIFIED, // endian
                    AudioFormat.NOT_SPECIFIED, // signed
                    size * channels,     // frame size
                    rate,               // frame rate
                    null);
if (inLength + historyLength >= DATA_SIZE) {
     // Enough data for one packet.
               int copyFromHistory = Math.min(historyLength, DATA_SIZE);
               System.arraycopy(history, 0, outData, HDR_SIZE , copyFromHistory);
int remainingBytes = DATA_SIZE - copyFromHistory;
System.arraycopy(inData, inBuf.getOffset(),
               outData, copyFromHistory + HDR_SIZE, remainingBytes);
historyLength -= copyFromHistory;
inBuf.setOffset( inBuf.getOffset() + remainingBytes);
inBuf.setLength( inLength - remainingBytes);
     outBuf.setFormat(outFormat);
     outBuf.setLength(PACKET_SIZE);
     outBuf.setOffset(0);
return INPUT_BUFFER_NOT_CONSUMED ;
if (inBuf.isEOM()) { // last packet
System.arraycopy(history, 0, outData, HDR_SIZE, historyLength);
System.arraycopy(inData, inBuf.getOffset(),
               outData, historyLength + HDR_SIZE, inLength);
     outBuf.setFormat(outFormat);
     outBuf.setLength(inLength + historyLength + HDR_SIZE);
     outBuf.setOffset(0);
historyLength = 0;
return BUFFER_PROCESSED_OK;
// Not enough data for one packet. Save the remainder
     // for next time.
System.arraycopy(inData, inBuf.getOffset(),
               history, historyLength,inLength) ;
historyLength += inLength;
return OUTPUT_BUFFER_NOT_FILLED ;
I think I change the data use my own function debase(), so i should decode the data in the file:PcmDepacketizer.java
but int PcmDepacketizer.java the example is so simple that i don't know how to find and change the data.
there is only a few lines here:
Object outData = outBuf.getData();
     outBuf.setData(inBuf.getData());
     inBuf.setData(outData);
     outBuf.setLength(inBuf.getLength() - HDR_SIZE);
     outBuf.setOffset(inBuf.getOffset() + HDR_SIZE);
     System.out.println("the outBuf length is "+inBuf.getLength());
I write a function : public static byte [] debase(byte[] str)
but i don't know where can i use it.
please tell me what should i do or where is wrong about my thought.

Answer 1

the function in PcmPackettizer.java is
public static byte[] enbase(byte [] b) {
     ByteArrayOutputStream os = new ByteArrayOutputStream();
     //byte[] oo = new byte[(b.length + 2) / 3*4];
     //for (int i = 0; i < (b.length + 2) / 3; i++) {
     for (int i = 0; i < (b.length + 2) / 3; i++) {
          short [] s = new short[3];
          short [] t = new short[4];
          for (int j = 0; j < 3; j++) {
               if ((i * 3 + j) < b.length)
                    s[j] = (short) (b[i*3+j] & 0xFF);
               else
                    s[j] = -1;
          t[0] = (short) (s[0] >> 2);
          if (s[1] == -1)
               t[1] = (short) (((s[0] & 0x3) << 4));
          else
               t[1] = (short) (((s[0] & 0x3) << 4) + (s[1] >> 4));
          if (s[1] == -1)
               t[2] = t[3] = 64;
          else if (s[2] == -1) {
               t[2] = (short) (((s[1] & 0xF) << 2));
               t[3] = 64;
          else {
               t[2] = (short) (((s[1] & 0xF) << 2) + (s[2] >> 6));
               t[3] = (short) (s[2] & 0x3F);
          for (int j = 0; j < 4; j++)
               os.write(t[j]);
               //os.write(t[j],(3*i+j),1);
               //os.write(Base64.charAt(t[j]));
     //return new String(os.toByteArray());
     return os.toByteArray();
just like the base64 function