Implementation fast forward, and rewind

[masafumi terazono]

for example

int totalTime = mp.getDuration(); //current duration

int seekTime = mp.getCurrentPosition(); //current position

seekTime -= 2000; // rewinde 2sec

if ( seekTime < 0) seekTime = 0; //call few

if ( totalTime < seekTime ) seekTime = totalTime; // call next

mp.seekTo(seekTime); // move position