From 80e857c967ff063def0ffc2499d1c78b8d6d130b Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 18 Jun 2012 23:02:44 +0200 Subject: swr/resample: optimize C code for the most common case 15% speedup Signed-off-by: Michael Niedermayer --- libswresample/resample_template.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'libswresample/resample_template.c') diff --git a/libswresample/resample_template.c b/libswresample/resample_template.c index 0523add3aa..4060c66a43 100644 --- a/libswresample/resample_template.c +++ b/libswresample/resample_template.c @@ -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; ifilter_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); -- cgit v1.2.3