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 org.kc7bfi.jflac.io.BitInputStream;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Vector;

/**
 * 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;
    protected HashMap<String, String> strings;

    /**
     * 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);
        }
    }

    public String getVendor() {
        return new String(vendorString);
    }

    /**
     * @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;
        Vector<String> sbuff = new Vector<String>();
        for (VorbisString comment1 : comments) {
            String comment = comment1.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 sbuff.toArray(new String[sbuff.size()]);
    }

    public HashMap<String, String> getComments() {
        strings = new HashMap<String, String>();
        for (VorbisString comment1 : comments) {
            String comment = comment1.toString();
            int eqpos = comment.indexOf(0x3D); //Find the equals
            if (eqpos != -1) {
                String key = comment.substring(0, eqpos);
                String value = comment.substring(eqpos + 1);
                strings.put(key, value);
            }
        }
        return strings;
    }
}