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optimizing unpack_coeffs() 

Originally committed as revision 4127 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-04-14 18:33:26 +00:00
parent 86e59cc01d
commit 3c096ac791
1 changed files with 12 additions and 9 deletions
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21
libavcodec/snow.c
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@ -1817,10 +1817,21 @@ static inline void unpack_coeffs(SnowContext *s, SubBand *b, SubBand * parent, i
int context= av_log2(/*ABS(ll) + */3*(l>>1) + (lt>>1) + (t&~1) + (rt>>1) + (p>>1));
v=get_rac(&s->c, &b->state[0][context]);
if(v){
v= 2*(get_symbol2(&s->c, b->state[context + 2], context-4) + 1);
v+=get_rac(&s->c, &b->state[0][16 + 1 + 3 + quant3bA[l&0xFF] + 3*quant3bA[t&0xFF]]);
b->x_coeff[index].x=x;
b->x_coeff[index++].coeff= v;
}
}else{
if(!run){
run= get_symbol2(&s->c, b->state[1], 3);
v=1;
v= 2*(get_symbol2(&s->c, b->state[0 + 2], 0-4) + 1);
v+=get_rac(&s->c, &b->state[0][16 + 1 + 3]);
b->x_coeff[index].x=x;
b->x_coeff[index++].coeff= v;
}else{
run--;
v=0;
@ -1835,14 +1846,6 @@ static inline void unpack_coeffs(SnowContext *s, SubBand *b, SubBand * parent, i
}
}
}
if(v){
int context= av_log2(/*ABS(ll) + */3*(l>>1) + (lt>>1) + (t&~1) + (rt>>1) + (p>>1));
v= 2*(get_symbol2(&s->c, b->state[context + 2], context-4) + 1);
v+=get_rac(&s->c, &b->state[0][16 + 1 + 3 + quant3bA[l&0xFF] + 3*quant3bA[t&0xFF]]);
b->x_coeff[index].x=x;
b->x_coeff[index++].coeff= v;
}
}
b->x_coeff[index++].x= w+1; //end marker
prev_index= prev2_index;