How do I get a mp3 file's total time in Java?

Question

The answers provided in How do I get a sound file’s total time in Java? work well for wav files, but not for mp3 files.

They are (given a file):

AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(file);
AudioFormat format = audioInputStream.getFormat();
long frames = audioInputStream.getFrameLength();
double durationInSeconds = (frames+0.0) / format.getFrameRate();  

and:

AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(file);
AudioFormat format = audioInputStream.getFormat();
long audioFileLength = file.length();
int frameSize = format.getFrameSize();
float frameRate = format.getFrameRate();
float durationInSeconds = (audioFileLength / (frameSize * frameRate));

They give the same correct result for wav files, but wrong and different results for mp3 files.

Any idea what do I have to do to get the mp3 file's duration?

Answer 1

I'm old-fashioned in this, but I always simply get the specs for MP3, write a function that searches the right bits, and find it out.

If Winamp can determine this by reading the bitstream of an MP3 file, then so can I right?

And so can you, I believe in you mate!

Answer 2

Here is a detailed explanation of the MP3 File structure

http://www.autohotkey.com/forum/topic29420.html

Answer 3

Using MP3SPI:

private static void getDurationWithMp3Spi(File file) throws UnsupportedAudioFileException, IOException {

    AudioFileFormat fileFormat = AudioSystem.getAudioFileFormat(file);
    if (fileFormat instanceof TAudioFileFormat) {
        Map<?, ?> properties = ((TAudioFileFormat) fileFormat).properties();
        String key = "duration";
        Long microseconds = (Long) properties.get(key);
        int mili = (int) (microseconds / 1000);
        int sec = (mili / 1000) % 60;
        int min = (mili / 1000) / 60;
        System.out.println("time = " + min + ":" + sec);
    } else {
        throw new UnsupportedAudioFileException();
    }

}