Hi everyone, The problem is :

I want to play a encrypted multimedia file, first I must decrypt part of the file into a limited buffer because the file size may be very big, and then I play the buffer. When the content in the buffer is playing, the decrypting is undergoing.

And when the content in the buffer is played completely, I need to refresh the buffer manually until the file is decrypted and played completely.

Some one knows how to make it? Or have any suggestion? Thank you very much. :)