For MP3 HU owners: Java program for parsing iTunes library

[chylld]

Hi all

This is a little program i wrote that parses the iTunes library and copies all 4-star and 5-star songs out into another folder, sorted into further folders for each artist. It also renames the copied files so that they don't include characters which error (underscore) on our HU displays, like ?, *, & etc.

I wrote this because the default itunes way to burn mp3 cd's is either flat or double-nested by artist then album, which i felt didn't work well with my HU which only has prev/next folder and prev/next track.

If you burn the resulting folder structure to cdr (or better, cdrw) you can (if ur HU operates similar to mine) then use the "folder" knob to scroll through artists, and then the prev/next track buttons on the HU or on the steering wheel to scroll through songs for that artist. just seems to make better sense to me than going flat or scrolling to the "unknown album" folder all the time :)

feel free to use and/or modify the code at your own will; i trust if you know how to compile and run it, then you'll know how to change it! i've highlighted the 2 bits you'll probably need to change though.

package crumpet;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.net.URI;
import java.net.URLDecoder;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class Crumpet {
public static void main(String[] args) throws Exception {
new Crumpet();
}

public Crumpet() throws Exception {
parseXML("C:\\Documents and Settings\\username\\My Documents\\"+
"My Music\\iTunes\\iTunes Music Library.xml");
}

private void parseXML(String xmlFile) throws Exception {
parseTracks(getElementNodeByKey(
DocumentBuilderFactory
.newInstance()
.newDocumentBuilder()
.parse(new File(xmlFile))
.getDocumentElement()
.getElementsByTagName("dict")
.item(0),"Tracks"));
}

private void parseTracks(Node tracks) throws Exception {
NodeList children = tracks.getChildNodes();

for(int i=0;i<children.getLength();i++) {
Node n = children.item(i);
if(n.getNodeName().equals("dict")) {
parseTrack(n);
}
}
}

private void parseTrack(Node track) throws Exception {
String artist = getTextValue(getElementNodeByKey(track,"Artist"));
String name = getTextValue(getElementNodeByKey(track,"Name"));
String location = getTextValue(getElementNodeByKey(track,"Location") );
String rating = getTextValue(getElementNodeByKey(track,"Rating"));

if(rating.equals("80") || rating.equals("100")) {
String dest = "Y:\\songs\\"+artist+"\\"+name+".mp3";
fileCopy(URLDecoder.decode(location.substring(17), "UTF-8"),fileSafe(dest));
}
}

private Node getElementNodeByKey(Node node, String key) {
Node ret = null;
NodeList children = node.getChildNodes();

for(int i=0;i<children.getLength();i++) {
Node n = children.item(i);
if(n.getNodeName().equals("key") && getTextValue(n).equals(key)) {
ret = n.getNextSibling();
while(ret.getNodeType()!=Node.ELEMENT_NODE) {
ret = ret.getNextSibling();
}
}
}

return ret;
}

private String getTextValue(Node n) {
String ret = "";

if(n!=null) {
NodeList children = n.getChildNodes();
for(int i=0;i<children.getLength();i++) {
if(children.item(i).getNodeType()==Node.TEXT_NODE) {
ret += children.item(i).getNodeValue().trim();
}
}
}

return ret;
}

private void fileCopy(String src, String dest) throws Exception {
File fSrc = new File(src);
File fDest = new File(dest);

System.out.println(src+" => "+dest);

new File(dest.substring(0,dest.lastIndexOf("\\"))).mkd irs();

FileChannel in = null, out = null;

in = new FileInputStream(fSrc).getChannel();
out = new FileOutputStream(fDest).getChannel();

long size = in.size();
MappedByteBuffer buf = in.map(FileChannel.MapMode.READ_ONLY, 0, size);

out.write(buf);

in.close();
out.close();
}

private String fileSafe(String name) {
return name.replace("?","")
.replace("*","-")
.replace("(","")
.replace(")","")
.replace("'","")
.replace(",","")
.replace("&","-");
}
}

[skiz]

dude! that is sweet...

thanks

[Garrison]

My Nav unit also adds a number to the song even though my burned mp3 cd already contains the songs numbered. So I have a list of songs with the songs number displayed twice.

(e.g. 01 01 Promiscous-Nelly Furtado)

Will this correct that?

[chylld]

Originally Posted by Garrison

My Nav unit also adds a number to the song even though my burned mp3 cd already contains the songs numbered. So I have a list of songs with the songs number displayed twice.

(e.g. 01 01 Promiscous-Nelly Furtado)

Will this correct that?

most probably yes... the script above extracts the artist and name from the itunes playlist xml (which in turn comes from the mp3's id3 tag) so the name of the copied file shouldn't have that number at the start.

[Garrison]

+1 rep. Now, please forgive my ignorance. When do I put this code to make this happen? In the Itunes folder?

[chylld]

currently the above script exists only as a java program, which means you need a java compiler and java runtime to run it. if you don't know what that means (and i wouldn't blame you) then i suppose you can either learn a bit about java (at http://java.sun.com) or wait until someone writes an executable version that you can just download and run. the reason i haven't done that is simply due to the security risk of trusting an arbitrary program someone wants you to download and run...

apparently you can also write itunes plugins, although i have no experience in that area (yet)... that would be the easiest way as you'd potentially be able to run the program from within itunes.

[Garrison]

I guess it is always good to learn something new. Thank you!!