content: /*
   * Copyright (C) 2011-2014 GUIGUI Simon, fyhertz@gmail.com
   * 
   * 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 !");
  
  	}
  
  }
  