/*
* 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.exceptions.CannotReadException;
import org.jaudiotagger.audio.flac.metadatablock.MetadataBlockDataPicture;
import org.jaudiotagger.audio.flac.metadatablock.MetadataBlockHeader;
import org.jaudiotagger.tag.InvalidFrameException;
import org.jaudiotagger.tag.flac.FlacTag;
import org.jaudiotagger.tag.vorbiscomment.VorbisCommentReader;
import org.jaudiotagger.tag.vorbiscomment.VorbisCommentTag;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
/**
* Read Flac Tag
*/
public class FlacTagReader {
// Logger Object
public static Logger logger = Logger.getLogger("org.jaudiotagger.audio.flac");
private VorbisCommentReader vorbisCommentReader = new VorbisCommentReader();
public FlacTag read(RandomAccessFile raf) throws CannotReadException, IOException {
FlacStreamReader flacStream = new FlacStreamReader(raf);
flacStream.findStream();
//Hold the metadata
VorbisCommentTag tag = null;
List<MetadataBlockDataPicture> images = new ArrayList<MetadataBlockDataPicture>();
//Seems like we have a valid stream
boolean isLastBlock = false;
while (!isLastBlock) {
//Read the header
MetadataBlockHeader mbh = MetadataBlockHeader.readHeader(raf);
//Is it one containing some sort of metadata, therefore interested in it?
switch (mbh.getBlockType()) {
//We got a vorbiscomment comment block, parse it
case VORBIS_COMMENT:
byte[] commentHeaderRawPacket = new byte[mbh.getDataLength()];
raf.read(commentHeaderRawPacket);
tag = vorbisCommentReader.read(commentHeaderRawPacket, false);
break;
case PICTURE:
try {
MetadataBlockDataPicture mbdp = new MetadataBlockDataPicture(mbh, raf);
images.add(mbdp);
} catch (IOException ioe) {
//logger.warning("Unable to read picture metablock, ignoring:" + ioe.getMessage());
} catch (InvalidFrameException ive) {
//logger.warning("Unable to read picture metablock, ignoring" + ive.getMessage());
}
break;
//This is not a metadata block we are interested in so we skip to next block
default:
raf.seek(raf.getFilePointer() + mbh.getDataLength());
break;
}
isLastBlock = mbh.isLastBlock();
mbh = null;
}
//Note there may not be either a tag or any images, no problem this is valid however to make it easier we
//just initialize Flac with an empty VorbisTag
if (tag == null) {
tag = VorbisCommentTag.createNewTag();
}
FlacTag flacTag = new FlacTag(tag, images);
return flacTag;
}
}