question: public OutputStream createOutputStream ( int streamId ) { int channelId = ( 4 + ( ( streamId - 1 ) * 5 ) ) ; final Channel data = getChannel ( channelId ++ ) ; final Channel video = getChannel ( channelId ++ ) ; final Channel audio = getChannel ( channelId ++ ) ; return new OutputStream ( video , audio , data ) ; }
target:  Creates output stream object from stream id. Output stream consists of audio, data and video channels.