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50% faster decode_subband()

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Originally committed as revision 3418 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-08-27 01:06:58 +00:00
parent 07140e398c
commit 3c1adccd1c
1 changed files with 9 additions and 1 deletions
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10
libavcodec/snow.c
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@ -2033,8 +2033,16 @@ static inline void decode_subband(SnowContext *s, SubBand *b, DWTELEM *src, DWTE
//FIXME try to store a more naive run
v=1;
}else{
int py= y>>1;
run--;
v=0;
if(y && parent && py < b->parent->height){
while(run && x+2<w && !src[x + 2 + (y-1)*stride] && !parent[((x+1)>>1) + py*2*stride]){
x++;
run--;
}
}
}
}
if(v){
@ -2046,7 +2054,7 @@ static inline void decode_subband(SnowContext *s, SubBand *b, DWTELEM *src, DWTE
}
}
}
if(level+1 == s->spatial_decomposition_count){
if(w > 200 /*level+1 == s->spatial_decomposition_count*/){
STOP_TIMER("decode_subband")
}