package org.jaudiotagger.tag.mp4.field;
import org.jaudiotagger.audio.mp4.atom.Mp4BoxHeader;
import org.jaudiotagger.tag.FieldDataInvalidException;
import org.jaudiotagger.tag.mp4.Mp4FieldKey;
import org.jaudiotagger.tag.mp4.atom.Mp4DataBox;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
/**
* Represents the Track No field
* <p/>
* <p>There are a number of reserved fields making matters more complicated
* Reserved:2 bytes
* Track Number:2 bytes
* No of Tracks:2 bytes (or zero if not known)
* PlayListTitleReserved: 1 byte
* playtitlenameReserved:0 bytes
* </p>
*/
public class Mp4TrackField extends Mp4TagTextNumberField {
private static final int NONE_VALUE_INDEX = 0;
private static final int TRACK_NO_INDEX = 1;
private static final int TRACK_TOTAL_INDEX = 2;
private static final int NONE_END_VALUE_INDEX = 3;
/**
* Create new Track Field parsing the String for the trackno/total
*
* @param trackValue
* @throws org.jaudiotagger.tag.FieldDataInvalidException
*
*/
public Mp4TrackField(String trackValue) throws FieldDataInvalidException {
super(Mp4FieldKey.TRACK.getFieldName(), trackValue);
numbers = new ArrayList<Short>();
numbers.add(new Short("0"));
String values[] = trackValue.split("/");
switch (values.length) {
case 1:
try {
numbers.add(Short.parseShort(values[0]));
} catch (NumberFormatException nfe) {
throw new FieldDataInvalidException("Value of:" + values[0] + " is invalid for field:" + id);
}
numbers.add(new Short("0"));
numbers.add(new Short("0"));
break;
case 2:
try {
numbers.add(Short.parseShort(values[0]));
} catch (NumberFormatException nfe) {
throw new FieldDataInvalidException("Value of:" + values[0] + " is invalid for field:" + id);
}
try {
numbers.add(Short.parseShort(values[1]));
} catch (NumberFormatException nfe) {
throw new FieldDataInvalidException("Value of:" + values[1] + " is invalid for field:" + id);
}
numbers.add(new Short("0"));
break;
default:
throw new FieldDataInvalidException("Value is invalid for field:" + id);
}
}
/**
* Create new Track Field with only track No
*
* @param trackNo
*/
public Mp4TrackField(int trackNo) {
super(Mp4FieldKey.TRACK.getFieldName(), String.valueOf(trackNo));
numbers = new ArrayList<Short>();
numbers.add(new Short("0"));
numbers.add((short) trackNo);
numbers.add(new Short("0"));
numbers.add(new Short("0"));
}
/**
* Create new Track Field with track No and total tracks
*
* @param trackNo
* @param total
*/
public Mp4TrackField(int trackNo, int total) {
super(Mp4FieldKey.TRACK.getFieldName(), String.valueOf(trackNo));
numbers = new ArrayList<Short>();
numbers.add(new Short("0"));
numbers.add((short) trackNo);
numbers.add((short) total);
numbers.add(new Short("0"));
}
/**
* Construct from filedata
*
* @param id
* @param data
* @throws UnsupportedEncodingException
*/
public Mp4TrackField(String id, ByteBuffer data) throws UnsupportedEncodingException {
super(id, data);
}
protected void build(ByteBuffer data) throws UnsupportedEncodingException {
//Data actually contains a 'Data' Box so process data using this
Mp4BoxHeader header = new Mp4BoxHeader(data);
Mp4DataBox databox = new Mp4DataBox(header, data);
dataSize = header.getDataLength();
numbers = databox.getNumbers();
//Track number always hold three values, we can discard the first one, the second one is the track no
//and the third is the total no of tracks so only use if not zero
StringBuffer sb = new StringBuffer();
if (numbers != null) {
sb.append(numbers.get(TRACK_NO_INDEX));
if (numbers.get(TRACK_TOTAL_INDEX) > 0) {
sb.append("/").append(numbers.get(TRACK_TOTAL_INDEX));
}
}
content = sb.toString();
}
/**
* @return
*/
public Short getTrackNo() {
return numbers.get(TRACK_NO_INDEX);
}
/**
* @return
*/
public Short getTrackTotal() {
return numbers.get(TRACK_TOTAL_INDEX);
}
/**
* Set Track No
*
* @param trackNo
*/
public void setTrackNo(int trackNo) {
numbers.set(TRACK_NO_INDEX, (short) trackNo);
}
/**
* Set total number of tracks
*
* @param trackTotal
*/
public void setTrackTotal(int trackTotal) {
numbers.set(TRACK_TOTAL_INDEX, (short) trackTotal);
}
}