javafileaudiomp3

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


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?


Solution

  • 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();
        }
    
    }