VorbisComment.java

package org.kc7bfi.jflac.metadata;

/**
 * libFLAC - Free Lossless Audio Codec library
 * Copyright (C) 2001,2002,2003  Josh Coalson
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA  02111-1307, USA.
 */

import java.io.IOException;

import org.kc7bfi.jflac.io.BitInputStream;

/**
 * VorbisComment Metadata block.
 * @author kc7bfi
 */
public class VorbisComment extends Metadata {
    
    //private static final int VORBIS_COMMENT_NUM_COMMENTS_LEN = 32; // bits
    
    protected byte[] vendorString = new byte[0];
    protected int numComments = 0;
    protected VorbisString[] comments;
    
    /**
     * The constructor.
     * @param is                The InputBitStream
     * @param length            Length of the record
     * @param isLast            True if this is the last Metadata block in the chain
     * @throws IOException      Thrown if error reading from InputBitStream
     */
    public VorbisComment(BitInputStream is, int length, boolean isLast) throws IOException {
        super(isLast);
        
        // read vendor string
        int len = is.readRawIntLittleEndian();
        vendorString = new byte[len];
        is.readByteBlockAlignedNoCRC(vendorString, vendorString.length);
        
        // read comments
        numComments = is.readRawIntLittleEndian();
        if (numComments > 0) comments = new VorbisString[numComments];
        for (int i = 0; i < numComments; i++) {
            comments[i] = new VorbisString(is);
        }
    }
    
    /**
     * @see java.lang.Object#toString()
     */
    public String toString() {
	StringBuffer sb = new StringBuffer("VendorString '" + vendorString + "'\n");
	sb.append("VorbisComment (count=" + numComments + ")");

        for (int i = 0; i < numComments; i++) {
            sb.append("\n\t" + comments[i].toString());
        }
        
        return sb.toString();
        
    }
    
    public String [] getCommentByName( String key )  {
        if (key == null ) return null;
        java.util.Vector sbuff = new java.util.Vector();
        for( int i=0; i < comments.length; i++ )  {
            String comment = comments[i].toString();
            int eqpos = comment.indexOf(0x3D); //Find the equals
            if (eqpos != -1 )
                if( comment.substring(0, eqpos).equalsIgnoreCase(key) )
                    sbuff.add( comment.substring(eqpos+1, comment.length()) );
        }
        return (String [])sbuff.toArray(new String[0]);
        //return null;
    }
}