android how to take data side edge of a recorded video ?

Brother when recording video using MediaRecorder, interface put two SurfaceView.
can now be achieved using a SurfaceView record video , click the play button after recording in another SurfaceView in video.
But when I want to achieve in the process of recording video , while recording while playing . That is, a SurfaceView recording, the recording process other SurfaceView time playback.
mainly does is this:
1, how to retrieve data when recording video
2, the data obtained to demonstrate how SurfaceView
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add that my coding format is h264
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