ttadec: use branchless unsigned-to-signed unfolding

2012-02-16 21:51:03 -05:00 · 2012-02-16 21:51:03 -05:00 · f2a4559c77
commit f2a4559c77
parent d7840529b6
1 changed files with 1 additions and 2 deletions
--- a/libavcodec/tta.c
+++ b/libavcodec/tta.c
@ -396,8 +396,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
        }

        // extract coded value
-#define UNFOLD(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
-        *p = UNFOLD(value);
+        *p = 1 + ((value >> 1) ^ ((value & 1) - 1));

        // run hybrid filter
        ttafilter_process(filter, p);