From 62ae9b7d30e6e0457d8a47a6a281d4c328e2ec65 Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Mon, 21 Feb 2022 17:34:36 +0100
Subject: [PATCH] filter-chain: avoid denormals in biquad

See #1681 #2160
---
 src/modules/module-filter-chain/builtin_plugin.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/modules/module-filter-chain/builtin_plugin.c b/src/modules/module-filter-chain/builtin_plugin.c
index 9b68a7fcb..91c5d7f63 100644
--- a/src/modules/module-filter-chain/builtin_plugin.c
+++ b/src/modules/module-filter-chain/builtin_plugin.c
@@ -24,6 +24,7 @@
 
 #include "config.h"
 
+#include <float.h>
 #include <math.h>
 #ifdef HAVE_SNDFILE
 #include <sndfile.h>
@@ -303,10 +304,12 @@ static void bq_run(struct builtin *impl, unsigned long samples, int type)
 		y2 = y1;
 		y1 = y;
 	}
-	bq->x1 = x1;
-	bq->x2 = x2;
-	bq->y1 = y1;
-	bq->y2 = y2;
+#define F(x) (-FLT_MIN < (x) && (x) < FLT_MIN ? 0.0f : (x))
+	bq->x1 = F(x1);
+	bq->x2 = F(x2);
+	bq->y1 = F(y1);
+	bq->y2 = F(y2);
+#undef F
 }
 
 /** bq_lowpass */