/**
* Used by tags when writing to calculate the location of the music file
*
* @param file
* @return the location within the file that the audio starts
* @throws java.io.IOException
* @throws org.jaudiotagger.audio.exceptions.InvalidAudioFrameException
*/
public long getMP3StartByte(File file) throws InvalidAudioFrameException, IOException {
try {
// Read ID3v2 tag size (if tag exists) to allow audio header parsing to skip over tag
long startByte = AbstractID3v2Tag.getV2TagSizeIfExists(file);
MP3AudioHeader audioHeader = new MP3AudioHeader(file, startByte);
if (startByte != audioHeader.getMp3StartByte()) {
logger.config("First header found after tag:" + audioHeader);
audioHeader = checkAudioStart(startByte, audioHeader);
}
return audioHeader.getMp3StartByte();
} catch (InvalidAudioFrameException iafe) {
throw iafe;
} catch (IOException ioe) {
throw ioe;
}
}
/**
* Saves the tags in this dataType to the file argument. It will be saved as
* TagConstants.MP3_FILE_SAVE_WRITE
*
* @param fileToSave file to save the this dataTypes tags to
* @throws FileNotFoundException if unable to find file
* @throws IOException on any I/O error
*/
public void save(File fileToSave) throws IOException {
// Ensure we are dealing with absolute filepaths not relative ones
File file = fileToSave.getAbsoluteFile();
logger.config("Saving : " + file.getPath());
// Checks before starting write
precheck(file);
RandomAccessFile rfile = null;
try {
// ID3v2 Tag
if (TagOptionSingleton.getInstance().isId3v2Save()) {
if (id3v2tag == null) {
rfile = new RandomAccessFile(file, "rw");
(new ID3v24Tag()).delete(rfile);
(new ID3v23Tag()).delete(rfile);
(new ID3v22Tag()).delete(rfile);
logger.config("Deleting ID3v2 tag:" + file.getName());
rfile.close();
} else {
logger.config("Writing ID3v2 tag:" + file.getName());
final MP3AudioHeader mp3AudioHeader = (MP3AudioHeader) this.getAudioHeader();
final long mp3StartByte = mp3AudioHeader.getMp3StartByte();
final long newMp3StartByte = id3v2tag.write(file, mp3StartByte);
if (mp3StartByte != newMp3StartByte) {
logger.config("New mp3 start byte: " + newMp3StartByte);
mp3AudioHeader.setMp3StartByte(newMp3StartByte);
}
}
}
rfile = new RandomAccessFile(file, "rw");
// Lyrics 3 Tag
if (TagOptionSingleton.getInstance().isLyrics3Save()) {
if (lyrics3tag != null) {
lyrics3tag.write(rfile);
}
}
// ID3v1 tag
if (TagOptionSingleton.getInstance().isId3v1Save()) {
logger.config("Processing ID3v1");
if (id3v1tag == null) {
logger.config("Deleting ID3v1");
(new ID3v1Tag()).delete(rfile);
} else {
logger.config("Saving ID3v1");
id3v1tag.write(rfile);
}
}
} catch (FileNotFoundException ex) {
logger.log(
Level.SEVERE,
ErrorMessage.GENERAL_WRITE_FAILED_BECAUSE_FILE_NOT_FOUND.getMsg(file.getName()),
ex);
throw ex;
} catch (IOException iex) {
logger.log(
Level.SEVERE,
ErrorMessage.GENERAL_WRITE_FAILED_BECAUSE.getMsg(file.getName(), iex.getMessage()),
iex);
throw iex;
} catch (RuntimeException re) {
logger.log(
Level.SEVERE,
ErrorMessage.GENERAL_WRITE_FAILED_BECAUSE.getMsg(file.getName(), re.getMessage()),
re);
throw re;
} finally {
if (rfile != null) {
rfile.close();
}
}
}
/**
* Regets the audio header starting from start of file, and write appropriate logging to indicate
* potential problem to user.
*
* @param startByte
* @param firstHeaderAfterTag
* @return
* @throws IOException
* @throws InvalidAudioFrameException
*/
private MP3AudioHeader checkAudioStart(long startByte, MP3AudioHeader firstHeaderAfterTag)
throws IOException, InvalidAudioFrameException {
MP3AudioHeader headerOne;
MP3AudioHeader headerTwo;
logger.warning(
ErrorMessage.MP3_ID3TAG_LENGTH_INCORRECT.getMsg(
file.getPath(),
Hex.asHex(startByte),
Hex.asHex(firstHeaderAfterTag.getMp3StartByte())));
// because we cant agree on start location we reread the audioheader from the start of the file,
// at least
// this way we cant overwrite the audio although we might overwrite part of the tag if we write
// this file
// back later
headerOne = new MP3AudioHeader(file, 0);
logger.config("Checking from start:" + headerOne);
// Although the id3 tag size appears to be incorrect at least we have found the same location
// for the start
// of audio whether we start searching from start of file or at the end of the alleged of file
// so no real
// problem
if (firstHeaderAfterTag.getMp3StartByte() == headerOne.getMp3StartByte()) {
logger.config(
ErrorMessage.MP3_START_OF_AUDIO_CONFIRMED.getMsg(
file.getPath(), Hex.asHex(headerOne.getMp3StartByte())));
return firstHeaderAfterTag;
} else {
// We get a different value if read from start, can't guarantee 100% correct lets do some more
// checks
logger.config(
(ErrorMessage.MP3_RECALCULATED_POSSIBLE_START_OF_MP3_AUDIO.getMsg(
file.getPath(), Hex.asHex(headerOne.getMp3StartByte()))));
// Same frame count so probably both audio headers with newAudioHeader being the first one
if (firstHeaderAfterTag.getNumberOfFrames() == headerOne.getNumberOfFrames()) {
logger.warning(
(ErrorMessage.MP3_RECALCULATED_START_OF_MP3_AUDIO.getMsg(
file.getPath(), Hex.asHex(headerOne.getMp3StartByte()))));
return headerOne;
}
// If the size reported by the tag header is a little short and there is only nulls between
// the recorded value
// and the start of the first audio found then we stick with the original header as more
// likely that currentHeader
// DataInputStream not really a header
if (isFilePortionNull((int) startByte, (int) firstHeaderAfterTag.getMp3StartByte())) {
return firstHeaderAfterTag;
}
// Skip to the next header (header 2, counting from start of file)
headerTwo =
new MP3AudioHeader(
file, headerOne.getMp3StartByte() + headerOne.mp3FrameHeader.getFrameLength());
// It matches the header we found when doing the original search from after the ID3Tag
// therefore it
// seems that newAudioHeader was a false match and the original header was correct
if (headerTwo.getMp3StartByte() == firstHeaderAfterTag.getMp3StartByte()) {
logger.warning(
(ErrorMessage.MP3_START_OF_AUDIO_CONFIRMED.getMsg(
file.getPath(), Hex.asHex(firstHeaderAfterTag.getMp3StartByte()))));
return firstHeaderAfterTag;
}
// It matches the frameCount the header we just found so lends weight to the fact that the
// audio does indeed start at new header
// however it maybe that neither are really headers and just contain the same data being
// misrepresented as headers.
if (headerTwo.getNumberOfFrames() == headerOne.getNumberOfFrames()) {
logger.warning(
(ErrorMessage.MP3_RECALCULATED_START_OF_MP3_AUDIO.getMsg(
file.getPath(), Hex.asHex(headerOne.getMp3StartByte()))));
return headerOne;
}
/// Doesnt match the frameCount lets go back to the original header
else {
logger.warning(
(ErrorMessage.MP3_RECALCULATED_START_OF_MP3_AUDIO.getMsg(
file.getPath(), Hex.asHex(firstHeaderAfterTag.getMp3StartByte()))));
return firstHeaderAfterTag;
}
}
}
