An OBV indicator that uses Bid and Ask tick data.

I need someone to modify the OBV indicator in order to use both bid and ask tick data as volume rather than just the bid volume. 

i.e the total tick movement of both the bid and the ask 

Please have an understanding of how the OBV indicator works before responding to this post. 

I understand that you cannot access historic tick data so I would like it to update live and be built with the assumption that it will be running 24/7.

It should work like the current OBV indicator where the direction of the OBV line moves as the price moves and creates a new point on the line at the close of each bar.

And obviously I would like it to be displayed in a separate panel underneath the chart where the timeframe and timestamps match the chart it is attached to.