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Skip loop iterations which are no-ops due to data1[-lag..-1] being zero.
author
Bobby Bingham
<uhmmmm@gmail.com>
Mon, 13 Apr 2009 18:07:02 +0000
(18:07 +0000)
committer
Bobby Bingham
<uhmmmm@gmail.com>
Mon, 13 Apr 2009 18:07:02 +0000
(18:07 +0000)
Originally committed as revision 18498 to svn://svn.ffmpeg.org/ffmpeg/trunk
libavcodec/flacenc.c
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diff --git
a/libavcodec/flacenc.c
b/libavcodec/flacenc.c
index
3c73277
..
e8e5674
100644
(file)
--- a/
libavcodec/flacenc.c
+++ b/
libavcodec/flacenc.c
@@
-594,7
+594,7
@@
void ff_flac_compute_autocorr(const int32_t *data, int len, int lag,
for(j=0; j<lag; j+=2){
double sum0 = 1.0, sum1 = 1.0;
- for(i=
0
; i<len; i++){
+ for(i=
j
; i<len; i++){
sum0 += data1[i] * data1[i-j];
sum1 += data1[i] * data1[i-j-1];
}
@@
-604,7
+604,7
@@
void ff_flac_compute_autocorr(const int32_t *data, int len, int lag,
if(j==lag){
double sum = 1.0;
- for(i=
0
; i<len; i+=2){
+ for(i=
j-1
; i<len; i+=2){
sum += data1[i ] * data1[i-j ]
+ data1[i+1] * data1[i-j+1];
}