Android Open Source - voicelink Recieve Socket

• Back to Development/voice  ↑

From Project

Back to project page voicelink.

License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2011-2014 GUIGUI Simon, fyhertz@gmail.com
 * //w w  w  .j ava  2 s. co  m
 * This file is part of libstreaming (https://github.com/fyhertz/libstreaming)
 * 
 * Spydroid is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package net.audio.recieve;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.MulticastSocket;
import java.util.concurrent.Semaphore;

import android.util.Log;

/**
 * A basic implementation of an RTP socket. It implements a buffering mechanism,
 * relying on a FIFO of buffers and a Thread. That way, if a packetizer tries to
 * send many packets too quickly, the FIFO will grow and packets will be sent
 * one by one smoothly.
 */
public class RecieveSocket implements Runnable {

  public static final String TAG = "RecieveSocket";

  public static final int RTP_HEADER_LENGTH = 12;
  public static final int MTU = 1300;

  private MulticastSocket mSocket;
  public DatagramPacket[] mPackets;
  private byte[][] mBuffers;
  private long[] mTimestamps;

  private Semaphore mBufferRequested, mBufferCommitted;
  private Thread mThread;

  private long mCacheSize;
  private long mOldTimestamp = 0;
  private int mBufferCount, mBufferIn, mBufferOut;
  private int mCount = 0;

  public void start() {
    if (mThread == null) {
      isListenning = true;
      mThread = new Thread(this);
      mThread.start();
    }
  }

  /**
   * This RTP socket implements a buffering mechanism relying on a FIFO of
   * buffers and a Thread.
   * 
   * @throws IOException
   */
  public RecieveSocket() {

    mCacheSize = 00;
    mBufferCount = 300; // TODO: reajust that when the FIFO is full
    mBuffers = new byte[mBufferCount][];
    mPackets = new DatagramPacket[mBufferCount];

    for (int i = 0; i < mBufferCount; i++) {

      mBuffers[i] = new byte[MTU];
      mPackets[i] = new DatagramPacket(mBuffers[i], 1);

      /* Version(2) Padding(0) */
      /* ^ ^ Extension(0) */
      /* | | ^ */
      /* | -------- | */
      /* | |--------------------- */
      /* | || -----------------------> Source Identifier(0) */
      /* | || | */
      mBuffers[i][0] = (byte) Integer.parseInt("10000000", 2);

      /* Payload Type */
      mBuffers[i][1] = (byte) 96;

      /* Byte 2,3 -> Sequence Number */
      /* Byte 4,5,6,7 -> Timestamp */
      /* Byte 8,9,10,11 -> Sync Source Identifier */

    }

    try {
      mSocket = new MulticastSocket(8051);
    } catch (Exception e) {
      throw new RuntimeException(e.getMessage());
    }

  }

  boolean isListenning = false;
  public int packetIndex = 0;

  /** The Thread sends the packets in the FIFO one by one at a constant rate. */
  @Override
  public void run() {
    try {
      while (isListenning == true) {
        mSocket.receive(mPackets[packetIndex % mBufferCount]);
        packetIndex = packetIndex + 1;
        Log.e(TAG, "A packet recieved. packetIndex=" + packetIndex);
      }
    } catch (Exception e) {
      isListenning = false;
      e.printStackTrace();
    }
    mThread = null;
  }
}

Java Source Code List

• Back to Development/voice  ↑