How we will create, send and receive a voice packet of 20ms of size 100bytes

I want to store my voice samples in a multiple voice packets and then want to store them in a buffer. The buffer size is 100ms and 500bytes. the packets will be played after 20ms interval.

Please help and guide.

[Walter Roberson]

Does this happen to be about Simulink ?

[jawad]

% CLIENT connect to a server and read a message
%
% Usage - message = client(host, port, number_of_retries)
function message = client(host, port, number_of_retries)

      import java.net.Socket
      import java.io.*

      if (nargin < 3)
          number_of_retries = 20; % set to -1 for infinite
      end

      retry        = 0;
      input_socket = [];
      message      = [];

      while true

          retry = retry + 1;
          if ((number_of_retries > 0) && (retry > number_of_retries))
              fprintf(1, 'Too many retries\n');
              break;
          end

          try
              fprintf(1, 'Retry %d connecting to %s:%d\n', ...
                      retry, host, port);

              % throws if unable to connect
              input_socket = Socket(host, port);

              % get a buffered data input stream from the socket
              input_stream   = input_socket.getInputStream;
              d_input_stream = DataInputStream(input_stream);

              fprintf(1, 'Connected to server\n');

              % read data from the socket - wait a short time first
              pause(0.5);
              bytes_available = input_stream.available;
              fprintf(1, 'Reading %d bytes\n', bytes_available);

              message = zeros(1, bytes_available, 'uint8');
              for i = 1:bytes_available
                  message(i) = d_input_stream.readByte;
              end

              message = char(message);

              % cleanup
              input_socket.close;
              break;

          catch
              if ~isempty(input_socket)
                  input_socket.close;
              end

              % pause before retrying
              pause(1);
          end
      end
  end

[jawad]

% SERVER Write a message over the specified port
% 
% Usage - server(message, output_port, number_of_retries)
function server(message, output_port, number_of_retries)

      import java.net.ServerSocket
      import java.io.*

      if (nargin < 3)
          number_of_retries = 20; % set to -1 for infinite
      end
      retry             = 0;

      server_socket  = [];
      output_socket  = [];

      while true

          retry = retry + 1;

          try
              if ((number_of_retries > 0) && (retry > number_of_retries))
                  fprintf(1, 'Too many retries\n');
                  break;
              end

              fprintf(1, ['Try %d waiting for client to connect to this ' ...
                          'host on port : %d\n'], retry, output_port);

              % wait for 1 second for client to connect server socket
              server_socket = ServerSocket(output_port);
              server_socket.setSoTimeout(1000);

              output_socket = server_socket.accept;

              fprintf(1, 'Client connected\n');

              output_stream   = output_socket.getOutputStream;
              d_output_stream = DataOutputStream(output_stream);

              % output the data over the DataOutputStream
              % Convert to stream of bytes
              fprintf(1, 'Writing %d bytes\n', length(message))
              d_output_stream.writeBytes(char(message));
              d_output_stream.flush;

              % clean up
              server_socket.close;
              output_socket.close;
              break;

          catch
              if ~isempty(server_socket)
                  server_socket.close
              end

              if ~isempty(output_socket)
                  output_socket.close
              end

              % pause before retrying
              pause(1);
          end
      end
  end

[jawad]

 system('matlab -nodisplay -r YourScriptName &')

[jawad]

Dear Robert can you please explain to me how i will execute these client and server on the same machine. Kindly explain it step by step as I am new with the matlab and also with the networking portion of Matlab. I have found this code on the Mathworks forum.

Answer 1

[jawad]

No

In MatLab.

If you can do in Simulink, then sure.

[jawad]

Dear Reinaldo Flamino I have downloaded your file Judp.m file. But I don't know how i will run it. can you please explain me step by step. As i am new to Matlab and also network side. Thanks