Byte Arrays to PushBufferStream

Hi,
I'm currently working on a project that involves transmitting captured live audio over the network.
Simple enough, but the project requires that I take the encoded audio stream and transmit it as
if they were byte[] in a series of UDP packets.
There was a problem exactly like this in a previous post, and I used a custom DataSink (DataSourceReader.java)
to transmit the data from the PushBufferStream as it becomes available.
I realize this method introduces a lot of jitter and packet loss, but I am also working on developing
a protocol to deal with this.
The problem is on the receiver side: assuming that these packets arrive with high yield, is it possible to create
a PushBufferStream from the byte[] received (i.e. write to the stream as byte[] become available)?
I believe I can use the custom DataSource here,
http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/LiveData.html
after I get a PushBufferStream to create a DataSource which will be used to playback the audio.
Any opinions on better approaches would also be appreciated.
Thank you.

I'm back with a couple more questions after playing around with the code.
The custom RTPSocketAdapter code is great, but it's still running using RTP packets, right?
I need to solely use my custom protocol for this application, especially because I'll be splitting up data and sending different chunks to several different "relay" machines which will all be reconstructed at the final destination.
So, although this method may be more complicated, I still need a way to construct PushBufferDataSource from continuously incoming byte[]'s.
I've looked at the LiveStream.java example and modified it so that it has an "update" function which writes the next available byte[] to a storage array. The read() function was modified to write the next available byte[] from the storage to outdata, the read buffer. The update function is called everytime a byte[] is received at the socket.
When there are no new byte[]'s available to read, an empty byte[] is used until new data arrives.
Using LiveStream to construct a custom DataSource, I made a Player out of it, but the sound is all static. I'm afraid what I did might be terribly wrong or roundabout, but if you have any idea about what is going on, that would be great.
Here are the modified functions:
    public void update(byte[] block){
         if(marker==rxbuffersize){
              wrapped = true;
              marker=0;
         if((!wrapped) || (wrapped && marker!=lastRead)){
              rxbuffer[marker]=block;
              marker++;
    public void read(Buffer buffer) throws IOException {
     synchronized (this) {
          if(lastRead==rxbuffersize && marker!=rxbuffersize){
               wrapped = false;
              lastRead=0;
         Object outdata = buffer.getData();
         //if (outdata == null || !(outdata.getClass() == Format.byteArray) ||
          //((byte[])outdata).length < maxDataLength) {
         if(lastRead==marker){
              outdata = new byte[maxDataLength];
              //System.out.println("BAD");
         else{
              outdata = new byte[rxbuffer[lastRead].length];
              //System.out.println("GOOD");
          buffer.setData(outdata);
         if (videoData) {
          buffer.setFormat( rgbFormat );
          buffer.setTimeStamp( (long) (seqNo * (1000 / frameRate) * 1000000) );
          int lineNo = (seqNo * 2) % size.height;
          int chunkStart = lineNo * size.width * 3;
          System.arraycopy(data, chunkStart,
                     outdata, 0,
                     maxDataLength - (chunkStart));
          if (chunkStart != 0) {
              System.arraycopy(data, 0,
                         outdata, maxDataLength - chunkStart,
                         chunkStart);
         } else {
          buffer.setFormat( audioFormat );
          buffer.setTimeStamp( (long) seqNo * 1000000000 / 8 );
          if(lastRead!=marker)
               System.arraycopy(rxbuffer[lastRead], 0, outdata, 0, rxbuffer[lastRead].length);
         buffer.setSequenceNumber( seqNo );
         if(lastRead!=marker){
              buffer.setLength(rxbuffer[lastRead].length);
              lastRead++;
         else
              buffer.setLength(maxDataLength);
         buffer.setFlags(32864);
         buffer.setHeader( null );
         seqNo++;
    }

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r[6] = 0; g[6] = (byte)255; b[6] = (byte)255;
r[7] = (byte)192; g[7] = 0; b[7] = 0;
r[8] = (byte)255; g[8] = 0; b[8] = 0;
r[9] = (byte)192; g[9] = 0; b[9] = (byte)192;
r[10] = (byte)255; g[10] = 0; b[10] = (byte)255;
r[11] = (byte)192; g[11] = (byte)192; b[11] = 0;
r[12] = (byte)255; g[12] = (byte)255; b[12] = 0;
r[13] = (byte)80; g[13] = (byte)80; b[13] = (byte)80;
r[14] = (byte)192; g[14] = (byte)192; b[14] = (byte)192;
r[15] = (byte)255; g[15] = (byte)255; b[15] = (byte)255;
//create buffered image
ColorModel colorModel = new IndexColorModel(4, 16, r, g, b);
BufferedImage image = new BufferedImage(colorModel, writableRaster, false, null);Message was edited by:
ben_weisburd
Message was edited by:
ben_weisburd

I had the same problem too.
anyone found the solution for this problem?
thanks
Bruno Rabino
When I try to make a MD-form, where the base-table for the detail contains a column with a BLOB-datatype. I get following error when I finish creation of the form.
Error: Exception from wwv_generate_component.build_procedure (WWV-01821)
Error creating module: ORA-01403: no data found (WWV-16042)
When I use the table with the BLOB as master or in a form, it works fine.
Has anyone else experienced this problem? Or knows a way to fix or work around it. Thanks in advance.
Portal version: 3.0.6.6.5
null

Sending publickey through the network as a byte array.

I send client public key form server to client as a byte array through the network. I'm sruggling when I get that byte array from client side and again assign to the PublicKey variable. Anyone can give me any hints how can I extract the public key from the byte array.
Thank you

If your public key is from an X509 certificate, you can use the X509EncodedKeySpec class.

Sending a Byte array through a socket

Can someone please tell me how i can send a Byte array from a client to a sever using sockets?
Thanks
Mark

This tutorial should do the trick:
http://java.sun.com/docs/books/tutorial/networking/sockets/index.html

Trying to send multiple types in a byte array -- questions?

Hi,
I have a question which I would really appreciate any help on.
I am trying to send a byte array, that contains multiple types using a UDP app. and then receive it on the other end.
So far I have been able to do this using the following code. Please note that I create a new String, Float or Double object to be able to correctly send and receive. Here is the code:
//this is on the client side...
String mymessage ="Here is your stuff from your client" ;
int nbr = 22; Double nbr2 = new Double(1232.11223);
Float nbr3 = new Float(8098098.809808);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(mymessage);
oos.writeInt(nbr);
oos.writeObject(nbr2);
oos.writeObject(nbr3);
oos.close();
byte[] buffer = baos.toByteArray();
socket.send(packet);
//this is on the server side...
byte [] buffer = new byte [5000];
String mymessage = null; int nbr = 0; Double nbr2 = null;
Float nbr3 = null;
mymessage = (String)ois.readObject();
nbr = ois.readInt();
nbr2 = (Double) ois.readObject();
nbr3 = (Float) ois.readObject();
My main question here is that I have to create a new Float and Double object to be able to send and receive this byte array correctly. However, I would like to be able to have to only create 1object, stuff it with the String, int, Float and Double, send it and then correctly receive it on the other end.
So I tried creating another class, and then creating an obj of this class and stuffing it with the 4 types:
public class O_struct{
//the indiv. objects to be sent...
public String mymessage; public int nbr; public Double nbr2;
public Float nbr3;
//construct...
public O_struct(String mymessage_c, int nbr_c, double nbr2_c, float nbr3_c){
my_message = my_message_c;
nbr = nbr_c;
nbr2 = new Double(nbr2_c);
nbr3 = new Float(nbr3_c);
Then in main, using this new class:
in main():
O_struct some_obj_client = new O_struct("Here is your stuff from your client", 22, 1232.1234, 890980980.798);
oos.writeObject(some_obj_client);
oos.close();
send code....according to UDP
However on the receiving side, I am not sure how to be able to correctly retrieve the 4 types. Before I was explicitely creating those objects for sending, then I was casting them again on the receiving side to retrieve then and it does work.
But if I create a O_struct object and cast it as I did before with the indiv objects on the receiving end, I can't get the correct retrievals.
My code, on the server side:
O_struct some_obj_server = new O_struct(null, null, null. null);
some_obj_server = (O_struct)ois.readObject();
My main goal is to be able to send 4 types in a byte array, but the way I have written this code, I have to create a Float and Double obj to be able to send and receive correctly. I would rather not have to directly create these objects, but instead be able to stuff all 4 types into a byte array and then send it and correctly be able to retrieve all the info on the receiver's side.
I might be making this more complicated than needed, but this was the only way I could figure out how to do this and any help will be greatly appreciated.
If there an easier way to do I certainly will appreciate that advise as well.
Thanks.

public class O_struct implements Serializable {
// writing
ObjectOutputStream oos = ...;
O_struct struct = ...;
oos.writeObject(struct);
// reading
ObjectInputStream ois = ...;
O_struct struct = (O_struct)ois.readObject();
I will be sending 1000s of these byte arrays, and I'm sure having to create a new Double or Float on both ends will hinder this.
I am worried that having to create new objs every time it is sending a byte array will affect my application.
That's the wrong way to approach this. You're talking about adding complexity to your code and fuglifying it because you think it might improve performance. But you don't know if it will, or by how much, or even if it needs to be improved.
Personally, I'd guess that the I/O will have a much bigger affect on performance than object creation (which, contrary to popular belief, is generally quite fast now: http://www-128.ibm.com/developerworks/java/library/j-jtp01274.html)
If you think object creation is going to be a problem, then before you go and cock up your real code to work around it, create some tests that measure how fast it is one way vs. the other. Then only use the cock-up if the normal, easier to write and maintain way is too slow AND the cock-up is significantly faster.

Byte Arrays to PushBufferStream

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