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move some stuff out of an inner loop. 12% faster svq1 encoding. 

Originally committed as revision 8560 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2007-03-30 19:16:41 +00:00
parent 5900637219
commit e62b3dd210
1 changed files with 4 additions and 5 deletions
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9
libavcodec/svq1.c
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@ -992,17 +992,16 @@ static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref, uint8_t *dec
for(i=0; i<16; i++){
int sum= codebook_sum[stage*16 + i];
int sqr, diff, mean, score;
int sqr, diff, score;
vector = codebook + stage*size*16 + i*size;
sqr = s->dsp.ssd_int8_vs_int16(vector, block[stage], size);
diff= block_sum[stage] - sum;
mean= (diff + (size>>1)) >> (level+3);
assert(mean >-300 && mean<300);
if(intra) mean= av_clip(mean, 0, 255);
else mean= av_clip(mean, -256, 255);
score= sqr - ((diff*(int64_t)diff)>>(level+3)); //FIXME 64bit slooow
if(score < best_vector_score){
int mean= (diff + (size>>1)) >> (level+3);
assert(mean >-300 && mean<300);
mean= av_clip(mean, intra?0:-256, 255);
best_vector_score= score;
best_vector[stage]= i;
best_vector_sum= sum;