From f2a4559c77ebce36b575e75fad102d2e9f02bb5a Mon Sep 17 00:00:00 2001
From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Thu, 16 Feb 2012 21:51:03 -0500
Subject: [PATCH] ttadec: use branchless unsigned-to-signed unfolding

---
 libavcodec/tta.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/libavcodec/tta.c b/libavcodec/tta.c
index db9c1b288e..6f4d161504 100644
--- 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);