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Simplify implicit_weight table init.

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Originally committed as revision 22168 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-03-03 10:57:38 +00:00
parent 54063e37c1
commit 72f86ec013
1 changed files with 4 additions and 6 deletions
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10
libavcodec/h264.c
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@ -1435,16 +1435,14 @@ static void implicit_weight_table(H264Context *h){
for(ref1=0; ref1 < h->ref_count[1]; ref1++){
int poc1 = h->ref_list[1][ref1].poc;
int td = av_clip(poc1 - poc0, -128, 127);
h->implicit_weight[ref0][ref1] = 32;
if(td){
int tb = av_clip(cur_poc - poc0, -128, 127);
int tx = (16384 + (FFABS(td) >> 1)) / td;
int dist_scale_factor = av_clip((tb*tx + 32) >> 6, -1024, 1023) >> 2;
if(dist_scale_factor < -64 || dist_scale_factor > 128)
h->implicit_weight[ref0][ref1] = 32;
else
int dist_scale_factor = (tb*tx + 32) >> 8;
if(dist_scale_factor >= -64 && dist_scale_factor <= 128)
h->implicit_weight[ref0][ref1] = 64 - dist_scale_factor;
}else
h->implicit_weight[ref0][ref1] = 32;
}
}
}
}