metadatapacket.java

来自「java语言开发的P2P流媒体系统」· Java 代码 · 共 107 行

/* Stream-2-Stream - Peer to peer television and radio
 * October 13, 2005 - This file has been modified from the original P2P-Radio source
 * Project homepage: http://s2s.sourceforge.net/
 * Copyright (C) 2005-2006 Jason Hooks
 */

/* 
 * P2P-Radio - Peer to peer streaming system
 * Project homepage: http://p2p-radio.sourceforge.net/
 * Copyright (C) 2003-2004 Michael Kaufmann <[e-mail]>
 * 
 * ---------------------------------------------------------------------------
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * ---------------------------------------------------------------------------
 */

package p2pradio.packets;

import p2pradio.Metadata;
import java.io.*;
import java.util.Properties;

public class MetadataPacket extends MetaStreamPacket
{	
	private String songTitle;
	private String songUrl;
	
	public MetadataPacket(long seqNr, long timeStamp, Metadata metadata)
	{
		this(new byte[getMaxLength() + metadata.toByteArray().length], seqNr, timeStamp, metadata);
	}
	
	public MetadataPacket(byte content[], long seqNr, long timeStamp, Metadata metadata)
	{
		super(Packet.METADATA, content, seqNr, timeStamp);
		
		byte[] metadataBytes = metadata.toByteArray();
		
		// L鋘ge der Metadaten speichern
		writeInt(metadataBytes.length);
		
		checkBytesLeft(metadataBytes.length);
		
		// Metadaten kopieren
		System.arraycopy(metadataBytes, 0, content, offset, metadataBytes.length);
		offset += metadataBytes.length;
		songUrl = metadata.getSongURL();
		songTitle = metadata.getSongTitle();
	}
	
	protected MetadataPacket(byte content[], int contentLength)
	{
		super(content, contentLength);
		
		// L鋘ge der Metadaten lesen
		int length = readInt();
		
		checkBytesLeft(length);
		
		// Metadaten von einem ByteArrayInputStream lesen
		ByteArrayInputStream metadataStream = new ByteArrayInputStream(content, offset, length);
		Properties urltitle = new Properties();
		try {
			urltitle.load(metadataStream);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		songTitle = urltitle.getProperty(Metadata.SONG_TITLE);
		songUrl = urltitle.getProperty(Metadata.SONG_URL);
		 
		offset += length;
	}
	
	// Die Methode getMaxLength() gibt hier nur eine
	// Mindestl鋘ge zur點k
	protected static int getMaxLength()
	{
		return StreamPacket.getMaxLength() + 4;
	}
	
	protected String getTypeString()
	{
		return "Metadata"; //$NON-NLS-1$
	}
	public String getSongTitle()
	{
		return songTitle;
	}
	public String getSongUrl()
	{
		return songUrl;
	}
}