/*
* regain - A file search engine providing plenty of formats
* Copyright (C) 2004 Til Schneider
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Contact: Til Schneider, info@murfman.de
*
* CVS information:
* $RCSfile$
* $Source$
* $Date: 2008-03-16 20:50:37 +0100 (So, 16 Mär 2008) $
* $Author: thtesche $
* $Revision: 281 $
*/
package net.sf.regain.crawler.preparator;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import net.sf.regain.RegainException;
import net.sf.regain.crawler.document.AbstractPreparator;
import net.sf.regain.crawler.document.RawDocument;
import org.jaudiotagger.audio.exceptions.InvalidAudioFrameException;
import org.jaudiotagger.audio.exceptions.ReadOnlyFileException;
import org.jaudiotagger.audio.mp3.MP3File;
import org.jaudiotagger.tag.FieldKey;
import org.jaudiotagger.tag.TagException;
import org.jaudiotagger.tag.id3.ID3v1Tag;
import org.jaudiotagger.tag.id3.ID3v24Frames;
import org.jaudiotagger.tag.id3.ID3v24Tag;
/**
* Prepares a mp3 file for indexing of metadata
* <p>
* The following information from the audio tag (ID3v2 or ID3v1) will be extracted:
* artist, album, title, year, length, bitrate
*
* @author Thomas Tesche, cluster:Consult, http://www.thtesche.com/
*/
public class MP3Preparator extends AbstractPreparator {
/**
* Creates a new instance of MP3Preparator.
*
* @throws RegainException If creating the preparator failed.
*/
public MP3Preparator() throws RegainException {
super(new String[]{"audio/mp3", "audio/x-mp3", "audio/mpeg"});
}
/**
* Prepares the document for indexing
*
* @param rawDocument the document
*
* @throws RegainException if preparation goes wrong
*/
@Override
public void prepare(RawDocument rawDocument) throws RegainException {
File rawFile = rawDocument.getContentAsFile(false);
try {
MP3File mp3file = new MP3File(rawFile);
ArrayList<String> info = new ArrayList<String>();
if (mp3file.hasID3v2Tag()) {
ID3v24Tag id3v24tag = mp3file.getID3v2TagAsv24();
info.add(id3v24tag.getFirst(ID3v24Frames.FRAME_ID_ARTIST).trim());
info.add(id3v24tag.getFirst(ID3v24Frames.FRAME_ID_ALBUM).trim());
info.add(id3v24tag.getFirst(ID3v24Frames.FRAME_ID_TITLE).trim());
try {
int year = new Integer(id3v24tag.getFirst(ID3v24Frames.FRAME_ID_YEAR).trim()).intValue();
if (year > 0) {
info.add(id3v24tag.getFirst(ID3v24Frames.FRAME_ID_YEAR).trim());
}
} catch (Exception ex) {
}
info.add(mp3file.getMP3AudioHeader().getTrackLengthAsString().trim());
info.add(mp3file.getMP3AudioHeader().getBitRate().trim() + "kbps");
setCleanedContent(concatenateStringParts(info, Integer.MAX_VALUE));
setTitle(concatenateStringParts(info, 2));
} else if (mp3file.hasID3v1Tag()) {
ID3v1Tag tag = mp3file.getID3v1Tag();
info.add(tag.getFirst(FieldKey.ARTIST).trim());
info.add(tag.getFirst(FieldKey.ALBUM).trim());
info.add(tag.getFirst(FieldKey.TITLE).trim());
try {
int year = new Integer(tag.getFirst(FieldKey.YEAR).trim()).intValue();
if (year > 0) {
info.add(tag.getFirst(FieldKey.YEAR).trim());
}
} catch (Exception ex) {
}
info.add(mp3file.getMP3AudioHeader().getTrackLengthAsString().trim());
info.add(mp3file.getMP3AudioHeader().getBitRate().trim() + "kbps");
setCleanedContent(concatenateStringParts(info, Integer.MAX_VALUE));
setTitle(concatenateStringParts(info, 2));
} else {
setCleanedContent("");
}
} catch (TagException ex) {
throw new RegainException("Error handling audio file: " + rawDocument.getUrl(), ex);
} catch (ReadOnlyFileException ex) {
throw new RegainException("Error handling audio file: " + rawDocument.getUrl(), ex);
} catch (InvalidAudioFrameException ex) {
throw new RegainException("Error handling audio file: " + rawDocument.getUrl(), ex);
} catch (IOException ex) {
throw new RegainException("Error handling audio file: " + rawDocument.getUrl(), ex);
}
}
}