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Faster CAVLC decoding of trailing_ones. Based on a patch by dark shikari. 

decode_residual is about 3.3% faster.

Originally committed as revision 16219 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-12-18 16:11:19 +00:00
parent 93445d1617
commit 04824298a9
1 changed files with 5 additions and 3 deletions
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8
libavcodec/h264.c
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@ -4087,9 +4087,11 @@ static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, in
tprintf(h->s.avctx, "trailing:%d, total:%d\n", trailing_ones, total_coeff);
assert(total_coeff<=16);
for(i=0; i<trailing_ones; i++){
level[i]= 1 - 2*get_bits1(gb);
}
i = show_bits(gb, 3);
skip_bits(gb, trailing_ones);
level[0] = 1-((i&4)>>1);
level[1] = 1-((i&2) );
level[2] = 1-((i&1)<<1);
if(trailing_ones<total_coeff) {
int level_code, mask;