From 821fe7f3e60a23fc472b529c31e60ed4e30b2b96 Mon Sep 17 00:00:00 2001 From: Zhou Zongyi Date: Fri, 26 Feb 2010 22:45:35 +0000 Subject: [PATCH] Optimize (amvd>2)+(amvd>32), about 1 cpu cycles faster. patch by Zhou Zongyi @ zhouzy () os punkt pku dot edu speck cn Originally committed as revision 22084 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/h264_cabac.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libavcodec/h264_cabac.c b/libavcodec/h264_cabac.c index 91df714d62..9ae695ca08 100644 --- a/libavcodec/h264_cabac.c +++ b/libavcodec/h264_cabac.c @@ -912,7 +912,8 @@ static int decode_cabac_mb_ref( H264Context *h, int list, int n ) { static int decode_cabac_mb_mvd( H264Context *h, int ctxbase, int amvd, int *mvda) { int mvd; - if(!get_cabac(&h->cabac, &h->cabac_state[ctxbase+(amvd>2)+(amvd>32)])){ + if(!get_cabac(&h->cabac, &h->cabac_state[ctxbase+((amvd-3)>>(INT_BIT-1))+((amvd-33)>>(INT_BIT-1))+2])){ +// if(!get_cabac(&h->cabac, &h->cabac_state[ctxbase+(amvd>2)+(amvd>32)])){ *mvda= 0; return 0; }