Android Open Source - spydroid-ipcamera A A C L A T M Packetizer

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) 2011-2014 GUIGUI Simon, fyhertz@gmail.com
 * //from w  w  w . jav  a2 s. c  om
 * 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.majorkernelpanic.streaming.rtp;

import java.io.IOException;

import android.annotation.SuppressLint;
import android.media.MediaCodec.BufferInfo;
import android.os.SystemClock;
import android.util.Log;

/**
 * RFC 3640.  
 * 
 * Encapsulates AAC Access Units in RTP packets as specified in the RFC 3640.
 * This packetizer is used by the AACStream class in conjunction with the 
 * MediaCodec API introduced in Android 4.1 (API Level 16).       
 * 
 */
@SuppressLint("NewApi")
public class AACLATMPacketizer extends AbstractPacketizer implements Runnable {

  private final static String TAG = "AACLATMPacketizer";

  private Thread t;

  public AACLATMPacketizer() {
    super();
    socket.setCacheSize(0);
  }

  public void start() {
    if (t==null) {
      t = new Thread(this);
      t.start();
    }
  }

  public void stop() {
    if (t != null) {
      try {
        is.close();
      } catch (IOException ignore) {}
      t.interrupt();
      try {
        t.join();
      } catch (InterruptedException e) {}
      t = null;
    }
  }

  public void setSamplingRate(int samplingRate) {
    socket.setClockFrequency(samplingRate);
  }

  @SuppressLint("NewApi")
  public void run() {

    Log.d(TAG,"AAC LATM packetizer started !");

    int length = 0;
    long oldts;
    BufferInfo bufferInfo;

    try {
      while (!Thread.interrupted()) {
        buffer = socket.requestBuffer();
        length = is.read(buffer, rtphl+4, MAXPACKETSIZE-(rtphl+4));
        
        if (length>0) {
          
          bufferInfo = ((MediaCodecInputStream)is).getLastBufferInfo();
          //Log.d(TAG,"length: "+length+" ts: "+bufferInfo.presentationTimeUs);
          oldts = ts;
          ts = bufferInfo.presentationTimeUs*1000;
          
          // Seems to happen sometimes
          if (oldts>ts) {
            socket.commitBuffer();
            continue;
          }
          
          socket.markNextPacket();
          socket.updateTimestamp(ts);
          
          // AU-headers-length field: contains the size in bits of a AU-header
          // 13+3 = 16 bits -> 13bits for AU-size and 3bits for AU-Index / AU-Index-delta 
          // 13 bits will be enough because ADTS uses 13 bits for frame length
          buffer[rtphl] = 0;
          buffer[rtphl+1] = 0x10; 

          // AU-size
          buffer[rtphl+2] = (byte) (length>>5);
          buffer[rtphl+3] = (byte) (length<<3);

          // AU-Index
          buffer[rtphl+3] &= 0xF8;
          buffer[rtphl+3] |= 0x00;
          
          send(rtphl+length+4);
          
        } else {
          socket.commitBuffer();
        }    
        
      }
    } catch (IOException e) {
    } catch (ArrayIndexOutOfBoundsException e) {
      Log.e(TAG,"ArrayIndexOutOfBoundsException: "+(e.getMessage()!=null?e.getMessage():"unknown error"));
      e.printStackTrace();
    } catch (InterruptedException ignore) {}

    Log.d(TAG,"AAC LATM packetizer stopped !");

  }

}

Java Source Code List

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