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Optimize ctx calculation in decode_cabac_mb_mvd(), code by dark shikari.

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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
This commit is contained in:
Michael Niedermayer 2008-12-19 00:05:39 +00:00
parent 17779f39b6
commit 8955b66950
1 changed files with 2 additions and 8 deletions
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10
libavcodec/h264.c
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@ -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;