On Thu, 04 Jul 2024 16:30:57 +0200 Niklas Haas <ffm...@haasn.xyz> wrote: > 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 >
Forgot about this one. Merged as 68957f58..1b9c89c64. _______________________________________________ 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".
