/**
* If the frame body's values have been modified, then resize the raw binary buffer and store the
* new values there. When finished, the dirty flag is reset to indicate that the buffer is up to
* date, and the frame is now ready to be saved to the .mp3 file.
*/
@Override
public void setBuffer() {
if (isDirty()) {
int numSynchronizedLyricBytes = 0;
for (SynchronizedLyric synchronizedLyric : synchronizedLyrics)
numSynchronizedLyricBytes +=
stringToBytes(encoding, synchronizedLyric.getText()).length + 4;
byte[] languageBytes = language.getCodeBytes();
byte[] descriptionBytes = stringToBytes(encoding, description);
byte[] synchronizedLyricBytes = new byte[numSynchronizedLyricBytes];
byte[] textBytes = null;
byte[] timeStampBytes = null;
int index = 0;
buffer =
new byte
[1
+ languageBytes.length
+ 1
+ 1
+ descriptionBytes.length
+ synchronizedLyricBytes.length];
buffer[index] = (byte) encoding.ordinal();
index = 1;
System.arraycopy(languageBytes, 0, buffer, index, languageBytes.length);
index += languageBytes.length;
buffer[index] = (byte) timeStampFormat.getValue();
index++;
buffer[index] = (byte) contentType.ordinal();
index++;
System.arraycopy(descriptionBytes, 0, buffer, index, descriptionBytes.length);
index += descriptionBytes.length;
for (SynchronizedLyric synchronizedLyric : synchronizedLyrics) {
numSynchronizedLyricBytes +=
stringToBytes(encoding, synchronizedLyric.getText()).length + 4;
textBytes = stringToBytes(encoding, synchronizedLyric.getText());
System.arraycopy(textBytes, 0, buffer, index, textBytes.length);
index += textBytes.length;
timeStampBytes = intToBytes(synchronizedLyric.getTimeStamp());
System.arraycopy(timeStampBytes, 0, buffer, index, timeStampBytes.length);
index += timeStampBytes.length;
}
dirty = false;
}
}
/**
* parses the raw bytes of the frame body and stores the parsed values in the frame's fields.
*
* @throws IllegalArgumentException if an invalid value is detected while parsing the frame body's
* raw bytes.
*/
@Override
public void parse() throws IllegalArgumentException {
try {
setEncoding(Encoding.valueOf(buffer[0]));
} catch (
IllegalArgumentException
ex) { // ignore the bad value and set it to ISO-8859-1 so we can continue parsing the
// tag
setEncoding(Encoding.ISO_8859_1);
}
try {
setLanguage(
Language.getLanguage(new String(buffer, 1, 3, Encoding.ISO_8859_1.getCharacterSet())));
} catch (
IllegalArgumentException
ex) { // ignore the bad value and set it to english so we can continue parsing the tag
setLanguage(Language.ENG);
}
try {
setTimeStampFormat(TimeStampFormat.valueOf(buffer[4]));
} catch (
IllegalArgumentException
ex) { // ignore the bad value and set it to milliseconds so we can continue parsing the
// tag
setTimeStampFormat(TimeStampFormat.MS);
}
try {
setContentType(ContentType.getContentType(buffer[5]));
} catch (
IllegalArgumentException
ex) { // ignore the bad value and set it to other so we can continue parsing the tag
setContentType(ContentType.OTHER);
}
nullTerminatorIndex = getNextNullTerminator(6, encoding);
description = new String(buffer, 6, nullTerminatorIndex - 6, encoding.getCharacterSet()).trim();
nullTerminatorIndex += encoding.getNumBytesInNullTerminator();
Vector<SynchronizedLyric> lyrics = new Vector<SynchronizedLyric>();
String text;
int timeStamp;
while (nullTerminatorIndex < buffer.length) {
nextNullTerminatorIndex = getNextNullTerminator(nullTerminatorIndex, encoding);
text =
new String(
buffer,
nullTerminatorIndex,
nextNullTerminatorIndex - nullTerminatorIndex,
encoding.getCharacterSet())
.trim();
nullTerminatorIndex = nextNullTerminatorIndex + encoding.getNumBytesInNullTerminator();
timeStamp =
((buffer[nullTerminatorIndex] & 0xFF) << 24)
+ ((buffer[nullTerminatorIndex + 1] & 0xFF) << 16)
+ ((buffer[nullTerminatorIndex + 2] & 0xFF) << 8)
+ (buffer[nullTerminatorIndex + 3] & 0xFF);
nullTerminatorIndex += 4;
lyrics.add(new SynchronizedLyric(text, timeStamp));
}
setSynchronizedLyrics(lyrics);
dirty =
false; // we just read in the frame info, so the frame body's internal byte buffer is up to
// date
}
