[FFmpeg-devel] [PATCH] VP8: faster filter_level clip

[Ronald S. Bultje]

Hi,

On Thu, Feb 3, 2011 at 10:44 PM, Jason Garrett-Glaser <jason at x264.com> wrote:
> ---
> ?libavcodec/vp8.c | ? ?5 ++++-
> ?1 files changed, 4 insertions(+), 1 deletions(-)
>
> diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
> index bcf6237..1db57e4 100644
> --- a/libavcodec/vp8.c
> +++ b/libavcodec/vp8.c
> @@ -1480,7 +1480,10 @@ static av_always_inline void filter_level_for_mb(VP8Context *s, VP8Macroblock *m
> ? ? ? ? filter_level += s->lf_delta.ref[mb->ref_frame];
> ? ? ? ? filter_level += s->lf_delta.mode[mb->mode];
> ? ? }
> - ? ?filter_level = av_clip(filter_level, 0, 63);
> +
> +/* Like av_clip for inputs 0 and max, where max is equal to (2^n-1) */
> +#define POW2CLIP(x,max) (((x) & ~max) ? (-(x))>>31 & max : (x));
> + ? ?filter_level = POW2CLIP(filter_level, 63);
>
> ? ? interior_limit = filter_level;
> ? ? if (s->filter.sharpness) {
> --
> 1.7.3.2.451.g1c2ab.dirty

OK.

Ronald