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authorJason Garrett-Glaser <jason@x264.com>2011-02-03 19:44:32 -0800
committerJason Garrett-Glaser <jason@x264.com>2011-02-03 19:55:06 -0800
commita1b227bb533f173354795124e0b966277c251b56 (patch)
treed0cdf7bd7d6ed0243ba029e0a1ecc1cb96b55f5e
parentdd18c9a050ac1f1437151ceb2d2afbc96c5602d8 (diff)
downloadffmpeg-a1b227bb533f173354795124e0b966277c251b56.tar.gz
VP8: faster filter_level clip
-rw-r--r--libavcodec/vp8.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index bcf623790c..1db57e49ac 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) {