/*
* Entagged Audio Tag library
* Copyright (c) 2003-2005 Raphael Slinckx <raphael@slinckx.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.jaudiotagger.audio.flac;
import org.jaudiotagger.audio.flac.metadatablock.BlockType;
import org.jaudiotagger.audio.flac.metadatablock.MetadataBlockDataPadding;
import org.jaudiotagger.audio.flac.metadatablock.MetadataBlockDataPicture;
import org.jaudiotagger.audio.flac.metadatablock.MetadataBlockHeader;
import org.jaudiotagger.audio.generic.AbstractTagCreator;
import org.jaudiotagger.tag.Tag;
import org.jaudiotagger.tag.flac.FlacTag;
import org.jaudiotagger.tag.vorbiscomment.VorbisCommentCreator;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.ListIterator;
import java.util.logging.Logger;
/**
* Create the tag data ready for writing to flac file
*/
public class FlacTagCreator extends AbstractTagCreator {
// Logger Object
public static Logger logger = Logger.getLogger("org.jaudiotagger.audio.flac");
public static final int DEFAULT_PADDING = 4000;
private static final VorbisCommentCreator creator = new VorbisCommentCreator();
/**
* @param tag
* @param paddingSize extra padding to be added
* @return
* @throws UnsupportedEncodingException
*/
public ByteBuffer convert(Tag tag, int paddingSize) throws UnsupportedEncodingException {
// //logger.info("Convert flac tag:padding:" + paddingSize);
FlacTag flacTag = (FlacTag) tag;
int tagLength = 0;
ByteBuffer vorbiscomment = null;
if (flacTag.getVorbisCommentTag() != null) {
vorbiscomment = creator.convert(flacTag.getVorbisCommentTag());
tagLength = vorbiscomment.capacity() + MetadataBlockHeader.HEADER_LENGTH;
}
for (MetadataBlockDataPicture image : flacTag.getImages()) {
tagLength += image.getBytes().length + MetadataBlockHeader.HEADER_LENGTH;
}
// //logger.info("Convert flac tag:taglength:" + tagLength);
ByteBuffer buf = ByteBuffer.allocate(tagLength + paddingSize);
MetadataBlockHeader vorbisHeader;
//If there are other metadata blocks
if (flacTag.getVorbisCommentTag() != null) {
if ((paddingSize > 0) || (flacTag.getImages().size() > 0)) {
vorbisHeader = new MetadataBlockHeader(false, BlockType.VORBIS_COMMENT, vorbiscomment.capacity());
} else {
vorbisHeader = new MetadataBlockHeader(true, BlockType.VORBIS_COMMENT, vorbiscomment.capacity());
}
buf.put(vorbisHeader.getBytes());
buf.put(vorbiscomment);
}
//Images
ListIterator<MetadataBlockDataPicture> li = flacTag.getImages().listIterator();
while (li.hasNext()) {
MetadataBlockDataPicture imageField = li.next();
MetadataBlockHeader imageHeader;
if (paddingSize > 0 || li.hasNext()) {
imageHeader = new MetadataBlockHeader(false, BlockType.PICTURE, imageField.getLength());
} else {
imageHeader = new MetadataBlockHeader(true, BlockType.PICTURE, imageField.getLength());
}
buf.put(imageHeader.getBytes());
buf.put(imageField.getBytes());
}
//Padding
// //logger.info("Convert flac tag at" + buf.position());
if (paddingSize > 0) {
int paddingDataSize = paddingSize - MetadataBlockHeader.HEADER_LENGTH;
MetadataBlockHeader paddingHeader = new MetadataBlockHeader(true, BlockType.PADDING, paddingDataSize);
MetadataBlockDataPadding padding = new MetadataBlockDataPadding(paddingDataSize);
buf.put(paddingHeader.getBytes());
buf.put(padding.getBytes());
}
buf.rewind();
return buf;
}
}