[FFmpeg-cvslog] r18498 - trunk/libavcodec/flacenc.c

[koorogi]

Author: koorogi
Date: Mon Apr 13 20:07:02 2009
New Revision: 18498

Log:
Skip loop iterations which are no-ops due to data1[-lag..-1] being zero.

Modified:
   trunk/libavcodec/flacenc.c

Modified: trunk/libavcodec/flacenc.c
==============================================================================
--- trunk/libavcodec/flacenc.c	Mon Apr 13 18:59:38 2009	(r18497)
+++ trunk/libavcodec/flacenc.c	Mon Apr 13 20:07:02 2009	(r18498)
@@ -594,7 +594,7 @@ void ff_flac_compute_autocorr(const int3
 
     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 int3
 
     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];
         }