From 8955b66950c8c4050386ba07ecf76604fc3b55f6 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Fri, 19 Dec 2008 00:05:39 +0000
Subject: [PATCH] Optimize ctx calculation in decode_cabac_mb_mvd(), code by
 dark shikari. The case for 16x16 blocks becomes 10 cpu cycles faster on
 pentium dual, i could not find a speed difference in the case of subblocks
 though.

Originally committed as revision 16226 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/h264.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 7d14d04fe9..3e19c97c60 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -5039,14 +5039,8 @@ static int decode_cabac_mb_mvd( H264Context *h, int list, int n, int l ) {
     int amvd = abs( h->mvd_cache[list][scan8[n] - 1][l] ) +
                abs( h->mvd_cache[list][scan8[n] - 8][l] );
     int ctxbase = (l == 0) ? 40 : 47;
-    int ctx, mvd;
-
-    if( amvd < 3 )
-        ctx = 0;
-    else if( amvd > 32 )
-        ctx = 2;
-    else
-        ctx = 1;
+    int mvd;
+    int ctx = (amvd>2) + (amvd>32);
 
     if(!get_cabac(&h->cabac, &h->cabac_state[ctxbase+ctx]))
         return 0;