From: Niklas Haas <g...@haasn.dev> Based on my best understanding of what they do, given the source code. --- libswscale/swscale.h | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-)
diff --git a/libswscale/swscale.h b/libswscale/swscale.h index 9d4612aaf3..e22931cab4 100644 --- a/libswscale/swscale.h +++ b/libswscale/swscale.h @@ -82,11 +82,35 @@ const char *swscale_license(void); #define SWS_PRINT_INFO 0x1000 //the following 3 flags are not completely implemented -//internal chrominance subsampling info + +/** + * Perform full chroma upsampling when converting to RGB as part of scaling. + * + * For example, when converting 50x50 yuv420p to 100x100 rgba, setting this flag + * will scale the chroma plane from 25x25 to 100x100 (4:4:4), and then convert + * the 100x100 yuv444p image to rgba in the final output step. + * + * Without this flag, the chroma plane is instead scaled to 50x100 (4:2:2), + * with a single chroma sample being re-used for both horizontally adjacent RGBA + * output pixels. + */ #define SWS_FULL_CHR_H_INT 0x2000 -//input subsampling info + +/** + * Perform full chroma interpolation when downscaling RGB sources. + * + * For example, when converting a 100x100 rgba source to 50x50 yuv444p, setting + * this flag will generate a 100x100 (4:4:4) chroma plane, which is then + * downscaled to the required 50x50. + * + * Without this flag, the chroma plane is instead generated at 50x100 (dropping + * every other pixel), before then being downscaled to the required 50x50 + * resolution. + */ #define SWS_FULL_CHR_H_INP 0x4000 + #define SWS_DIRECT_BGR 0x8000 + #define SWS_ACCURATE_RND 0x40000 #define SWS_BITEXACT 0x80000 #define SWS_ERROR_DIFFUSION 0x800000 -- 2.45.2 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
