USE capture timestamp for encoder PTS?

hi:

    I want to use the data struct VCODEC_BITSBUF_S have element 

UInt32 timestamp;
/**< Capture or Display Frame timestamp, in msec */

     for PS stream's PTS and DTS

  I have audio stream, it capture in A8 host ,A8 and M3 don't use the same base,and the capture timestamp come from the vpss driver, is there some method to use the VPSS timestamp?

  if directly use the timestamp, audio and video will not sync!

 maybe someone can give me some advice!

thanks very much!