private static void swapBytes(byte[] b, int off, int len) {
        byte tempByte;
        for (int i = off; i < (off+len); i+=2) {
            tempByte = b[i];
            b[i] = b[i+1];
            b[i+1] = tempByte;
        }
    }
Returns the total of expected OGG bytes. 

@param dataBytesTotal The number of bytes in the input
@return If the computed number of bytes is less than the number
of bytes in the input, it is returned, otherwise the number 
of bytes in the input is returned.
jme3-jogg/src/main/java/com/jme3/audio/plugins/OGGLoader.java