/**
* Copyright 2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.nutch.parse.mp3;
import org.apache.nutch.parse.*;
import org.apache.nutch.protocol.Content;
import org.farng.mp3.MP3File;
import org.farng.mp3.TagException;
import org.farng.mp3.id3.AbstractID3v2;
import org.farng.mp3.id3.AbstractID3v2Frame;
import org.farng.mp3.id3.ID3v1;
import org.farng.mp3.object.AbstractMP3Object;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.Iterator;
/**
* A parser for MP3 audio files
* @author Andy Hedges
*/
public class MP3Parser implements Parser {
private MetadataCollector metadataCollector = new MetadataCollector();
public Parse getParse(Content content) throws ParseException {
Parse parse = null;
metadataCollector.putAll(content.getMetadata());
byte[] raw = content.getContent();
File tmp = null;
try {
tmp = File.createTempFile("nutch", ".mp3");
FileOutputStream fos = new FileOutputStream(tmp);
fos.write(raw);
fos.close();
MP3File mp3 = new MP3File(tmp);
if (mp3.hasID3v2Tag()) {
parse = getID3v2Parse(mp3);
} else if (mp3.hasID3v1Tag()) {
parse = getID3v1Parse(mp3);
} else {
throw new ParseException("No textual content available");
}
} catch (IOException e) {
throw new ParseException("Couldn't create temporary file", e);
} catch (TagException e) {
throw new ParseException("ID3 Tags could not be parsed", e);
} finally{
tmp.delete();
}
return parse;
}
private Parse getID3v1Parse(MP3File mp3) throws MalformedURLException {
ID3v1 tag = mp3.getID3v1Tag();
metadataCollector.notifyProperty("TALB-Text", tag.getAlbum());
metadataCollector.notifyProperty("TPE1-Text", tag.getArtist());
metadataCollector.notifyProperty("COMM-Text", tag.getComment());
metadataCollector.notifyProperty("TCON-Text", "(" + tag.getGenre() + ")");
metadataCollector.notifyProperty("TIT2-Text", tag.getTitle());
metadataCollector.notifyProperty("TYER-Text", tag.getYear());
ParseData parseData = new ParseData(metadataCollector.getTitle(),
metadataCollector.getOutlinks(),
metadataCollector.getData());
return new ParseImpl(metadataCollector.getText(), parseData);
}
public Parse getID3v2Parse(MP3File mp3) throws IOException {
AbstractID3v2 tag = mp3.getID3v2Tag();
Iterator it = tag.iterator();
while (it.hasNext()) {
AbstractID3v2Frame frame = (AbstractID3v2Frame) it.next();
String name = frame.getIdentifier().trim();
if (!name.equals("APIC")) {
Iterator itBody = frame.getBody().iterator();
while (itBody.hasNext()) {
AbstractMP3Object mp3Obj = (AbstractMP3Object) itBody.next();
String bodyName = mp3Obj.getIdentifier();
if (!bodyName.equals("Picture data")) {
String bodyValue = mp3Obj.getValue().toString();
metadataCollector.notifyProperty(name + "-" + bodyName, bodyValue);
}
}
}
}
ParseData parseData = new ParseData(metadataCollector.getTitle(),
metadataCollector.getOutlinks(),
metadataCollector.getData());
return new ParseImpl(metadataCollector.getText(), parseData);
}
}