Android Open Source - CamOMatic Audio Packetizer

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License

The source code is released under:

GNU General Public License

Java Source Code

package edu.uic.cs440;
/*w w  w. java  2 s .  c  o m*/
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;

import android.os.SystemClock;

public class AudioPacketizer extends Thread{
  static final int packetSize = 1400;
  private BufferedInputStream fis = null;
  private PacketHandler streamer = null;
  private int SSRC = 0;
  private int CSRC = 0;
  private volatile boolean isStoping = false;
  
  public AudioPacketizer(InputStream inputStream, PacketHandler handler, int SSRC, int CSRC){
    fis = new BufferedInputStream(inputStream);
    streamer = handler;
    this.SSRC = SSRC; //not yet used
    this.CSRC = CSRC; //not yet used
  }
  
  public void _stop(){
    isStoping = true;
  }
  
  public void run(){
    isStoping = false;
    //remove existing header
    byte[] buffer = new byte[packetSize + 12];
    buffer[0] = (byte)0x80;
    buffer[1] = (byte) 97 | (byte) 0x80;
    //buffer[2], buffer[3] is sequence number
    int seqn = (int) (Math.random() * Integer.MAX_VALUE);
    //4, 5, 6, 7 is timestamp
    long ts = SystemClock.elapsedRealtime() * 1000;
    //8, 9, 10, 11 is the SSRC... should not change so we can set it now
    int SSRC = (int) (Math.random() * Integer.MAX_VALUE);
    buffer[8] = (byte) (0xFF & (SSRC >> 24));
    buffer[9] = (byte) (0xFF & (SSRC >> 16));
    buffer[10] = (byte) (0xFF & (SSRC >> 8));
    buffer[11] = (byte) (0xFF & SSRC);
    int num = 0, number = 0;
    
    buffer[12] = (byte) 0xF0;
    
    try {
      while(fis.available() < 6);
      num = fis.read(buffer, 13, 6);
    } catch (IOException e1) {
      // TODO Auto-generated catch block
      e1.printStackTrace();
    }
    
    while(!isStoping){
        //set timestamp
        ts += 160;
        buffer[4] = (byte) (0xFF & (ts >> 24));
        buffer[5] = (byte) (0xFF & (ts >> 16));
        buffer[6] = (byte) (0xFF & (ts >> 8));
        buffer[7] = (byte) (0xFF & ts);
        //set sequence number
        buffer[2] = (byte) (0xFF & (seqn >> 8));
        buffer[3] = (byte) (0xFF & seqn);
        ++seqn;
        try {
          while(fis.available() < 33);
          num = fis.read(buffer, 13, 32);
        } catch (IOException e) {
          e.printStackTrace();
        }
        number += num;
        //send first FU-A packet
        streamer.newPacket(buffer, 45);
    }
  }
}

Java Source Code List

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