IPP Scaling - YCbCr BT.601 to BT.709 and vice-versa

I'm interested in using Intel's IPP to do some (basic) digital video processing.  In particular, I am interested in being able to:

• Upscale BT.601 SD to BT.709 HD (YCbCr)
• Downscale BT.709 to BT.601 SD (YCbCr)

Having read/studied the available online documentation, I cannot see how this can be achieved. Does this conversion require a 2-step process by namely first scaling and then using another operation to perform a colorspace conversion or would I be able to scale while performing on-the-fly colorspace conversion.

Any tips/suggestions would be much appreciated.