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colorspace: Add support for BT709

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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
1 changed files with 11 additions and 0 deletions
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11
libavutil/colorspace.h
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@ -41,6 +41,17 @@
b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
}
#define YUV_TO_RGB1_CCIR_BT709(cb1, cr1) \
{ \
cb = (cb1) - 128; \
cr = (cr1) - 128; \
r_add = ONE_HALF + FIX(1.5747 * 255.0 / 224.0) * cr; \
g_add = ONE_HALF - FIX(0.1873 * 255.0 / 224.0) * cb - \
FIX(0.4682 * 255.0 / 224.0) * cr; \
b_add = ONE_HALF + FIX(1.8556 * 255.0 / 224.0) * cb; \
}
// To be used for the BT709 variant as well
#define YUV_TO_RGB2_CCIR(r, g, b, y1)\
{\
y = ((y1) - 16) * FIX(255.0/219.0);\