avfilter/af_anlmdn: ignore too small values

ed3b6440 · Paul B Mahol · 8a1fc958 · ed3b6440
Commit ed3b6440 authored Jan 09, 2019 by Paul B Mahol
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af_anlmdn.c libavfilter/af_anlmdn.c +4 -1

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--- a/libavfilter/af_anlmdn.c
+++ b/libavfilter/af_anlmdn.c
@@ -168,7 +168,10 @@ static int filter_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
            float w;

            av_assert0(distance >= 0.f);
-            w = expf(-distance * sw);
+            w = -distance * sw;
+            if (w < -11.f)
+                continue;
+            w = expf(w);
            P += w * f[i - S + j + (j >= S)];
            Q += w;
        }