diff options
author | Michael Niedermayer <michaelni@gmx.at> | 2012-06-18 23:02:44 +0200 |
---|---|---|
committer | Michael Niedermayer <michaelni@gmx.at> | 2012-06-19 03:09:24 +0200 |
commit | 80e857c967ff063def0ffc2499d1c78b8d6d130b (patch) | |
tree | dce2b0d760775259b45634fefb8a3815340e2bb0 /libswresample | |
parent | c90e8054af849759d3c06b31dba3fa592fcdc3e6 (diff) | |
download | ffmpeg-80e857c967ff063def0ffc2499d1c78b8d6d130b.tar.gz |
swr/resample: optimize C code for the most common case
15% speedup
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libswresample')
-rw-r--r-- | libswresample/resample_template.c | 22 |
1 files changed, 22 insertions, 0 deletions
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; 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); |