Audio total time before sound complete

Hi,

I am loading the sound and i want to get the length of the sound before sound has fully loaded. I have tried to get following methods that calculate the sound length from the following urls:

  1. http://www.stevensacks.net/2008/12/02/calculating-duration-on-mp3s-in-as3/
  2. http://www.multimediacollege.be/2010/07/estimating-the-duration-of-a-sound-object-while-loading/
  3. http://www.h3xed.com/programming/how-to-streaming-mp3-sound-length-actionscript-3
  4. http://help.adobe.com/en_US/as3/dev/WS5b3ccc516d4fbf351e63e3d118a9b90204-7d21.html

The sound i am using do not have the length in the ID3 tags too.

Please I searched enough on it Kindly provide some solution to this problem.

Regards