colorspace: Add support for BT709

BT.709 coefficients were gathered from the first two parts of BT.709
to BT.2020 conversion guide in ARIB STD-B62 (Pt. 1, Chapter 6.2.2).
They were additionally confirmed by manually calculating values.
This commit is contained in:
Jan Ekström 2016-04-24 20:30:06 +02:00 committed by Luca Barbato
parent 283226e11c
commit 1f77e634bb