avfilter/af_aiir: fix first denominator calculation

8c825e43 · Paul B Mahol · 07a9e5ec · 8c825e43
Commit 8c825e43 authored May 22, 2020 by Paul B Mahol
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af_aiir.c libavfilter/af_aiir.c +2 -1

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--- a/libavfilter/af_aiir.c
+++ b/libavfilter/af_aiir.c
@@ -1038,8 +1038,9 @@ static int config_output(AVFilterLink *outlink)
            iir->ab[0][i] /= iir->ab[0][0];
        }

+        iir->ab[0][0] = 1.0;
        for (i = 0; i < iir->nb_ab[1]; i++) {
-            iir->ab[1][i] *= iir->g / iir->ab[0][0];
+            iir->ab[1][i] *= iir->g;
        }

        normalize_coeffs(ctx, ch);