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avutil/colorspace: add macros for RGB->YUV BT.709

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This commit is contained in:
Gyan Doshi 2019-04-13 17:01:09 +05:30
parent 96fc0cbfde
commit 3bef1dab6e
1 changed files with 28 additions and 0 deletions
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28
libavutil/colorspace.h
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@ -119,4 +119,32 @@ static inline int C_JPEG_TO_CCIR(int y) {
(((FIX(0.50000) * r1 - FIX(0.41869) * g1 - \
FIX(0.08131) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128)
// Conversion macros for 8-bit RGB to YUV
// Derived from ITU-R BT.709-6 (06/2015) Item 3.5
// https://www.itu.int/rec/R-REC-BT.709-6-201506-I/en
#define RGB_TO_Y_BT709(r, g, b) \
((FIX(0.21260*219.0/255.0) * (r) + FIX(0.71520*219.0/255.0) * (g) + \
FIX(0.07220*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
#define RGB_TO_U_BT709(r1, g1, b1, shift)\
(((- FIX(0.11457*224.0/255.0) * r1 - FIX(0.38543*224.0/255.0) * g1 + \
FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
#define RGB_TO_V_BT709(r1, g1, b1, shift)\
(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.45415*224.0/255.0) * g1 - \
FIX(0.04585*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
#define RGB_TO_Y_BT709_FULL(r, g, b) \
(FFMIN((FIX(0.21260) * (r) + FIX(0.71520) * (g) + \
FIX(0.07220) * (b) + (ONE_HALF)) >> SCALEBITS, 255))
#define RGB_TO_U_BT709_FULL(r1, g1, b1)\
(((- FIX(0.11457) * r1 - FIX(0.38543) * g1 + \
FIX(0.50000) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128)
#define RGB_TO_V_BT709_FULL(r1, g1, b1)\
(((FIX(0.50000) * r1 - FIX(0.45415) * g1 - \
FIX(0.04585) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128)
#endif /* AVUTIL_COLORSPACE_H */