@@ -124,6 +124,42 @@ void av_build_filter(FELEM *filter, double factor, int tap_count, int phase_coun

             filter[ph * tap_count + i] = v;

         }

     }

+#if 0

+    {

+#define LEN 1024

+        int j,k;

+        double sine[LEN + tap_count];

+        double filtered[LEN];

+        double maxff=-2, minff=2, maxsf=-2, minsf=2;

+        for(i=0; i<LEN; i++){

+            double ss=0, sf=0, ff=0;

+            for(j=0; j<LEN+tap_count; j++)

+                sine[j]= cos(i*j*M_PI/LEN);

+            for(j=0; j<LEN; j++){

+                double sum=0;

+                ph=0;

+                for(k=0; k<tap_count; k++)

+                    sum += filter[ph * tap_count + k] * sine[k+j];

+                filtered[j]= sum / (1<<FILTER_SHIFT);

+                ss+= sine[j + center] * sine[j + center];

+                ff+= filtered[j] * filtered[j];

+                sf+= sine[j + center] * filtered[j];

+            }

+            ss= sqrt(2*ss/LEN);

+            ff= sqrt(2*ff/LEN);

+            sf= 2*sf/LEN;

+            maxff= FFMAX(maxff, ff);

+            minff= FFMIN(minff, ff);

+            maxsf= FFMAX(maxsf, sf);

+            minsf= FFMIN(minsf, sf);

+            if(i%11==0){

+                av_log(NULL, AV_LOG_ERROR, "i:%4d ss:%f ff:%f-%f sf:%f-%f\n", i, ss, maxff, minff, maxsf, minsf);

+                minff=minsf= 2;

+                maxff=maxsf= -2;

+            }

+        }

+    }

+#endif

 }

 /**