I'm trying to use the gdx-audio extensions, but am having trouble decoding mp3s. It works, but very slowly!! A 10-second file is taking 6.57 seconds to decode :( Here is the method:

public void decode() {
    Mpg123Decoder decoder = new Mpg123Decoder(externalFile);

    short[] sampleArray = new short[1024];

    // read until we reach the end of the file
    while (decoder.readSamples(sampleArray, 0, sampleArray.length) > 0) {}
}

Can anyone tell me why this is taking so long?