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swr/resample: optimize C code for the most common case 

15% speedup

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-06-18 23:02:44 +02:00
parent c90e8054af
commit 80e857c967
1 changed files with 22 additions and 0 deletions
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22
libswresample/resample_template.c
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@ -48,6 +48,28 @@ int RENAME(swri_resample)(ResampleContext *c, DELEM *dst, const DELEM *src, int
index += dst_index * dst_incr;
index += (frac + dst_index * (int64_t)dst_incr_frac) / c->src_incr;
frac = (frac + dst_index * (int64_t)dst_incr_frac) % c->src_incr;
}else if(compensation_distance == 0 && !c->linear && index >= 0){
for(dst_index=0; dst_index < dst_size; dst_index++){
FELEM *filter= ((FELEM*)c->filter_bank) + c->filter_length*(index & c->phase_mask);
int sample_index= index >> c->phase_shift;
if(sample_index + c->filter_length > src_size){
break;
}else{
FELEM2 val=0;
for(i=0; i<c->filter_length; i++){
val += src[sample_index + i] * (FELEM2)filter[i];
}
OUT(dst[dst_index], val);
}
frac += dst_incr_frac;
index += dst_incr;
if(frac >= c->src_incr){
frac -= c->src_incr;
index++;
}
}
}else{
for(dst_index=0; dst_index < dst_size; dst_index++){
FELEM *filter= ((FELEM*)c->filter_bank) + c->filter_length*(index & c->phase_mask);