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| author | Gyan Doshi <ffmpeg@gyani.pro> | 2019-04-13 17:01:09 +0530 |
|---|---|---|
| committer | Gyan Doshi <ffmpeg@gyani.pro> | 2019-04-19 17:10:20 +0530 |
| commit | 3bef1dab6e881bf593037f831e66ed87c6167e3c (patch) | |
| tree | b5aeaf8d04c1946b2bed31f7956a8e976bd45a48 | |
| parent | 96fc0cbfde2410a1150851061b7ecfe868b653ef (diff) | |
| download | ffmpeg-3bef1dab6e881bf593037f831e66ed87c6167e3c.tar.gz | |
avutil/colorspace: add macros for RGB->YUV BT.709
| -rw-r--r-- | libavutil/colorspace.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/libavutil/colorspace.h b/libavutil/colorspace.h index d0be8cb99a..ef6f6107d6 100644 --- a/libavutil/colorspace.h +++ b/libavutil/colorspace.h @@ -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 */ |