From aad3d1eafa06f8a8f0e79e0f264c781e5d7a33dc Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Mon, 11 Nov 2024 16:41:17 +0100
Subject: [PATCH] filter-chain: improve biquad run a little

We only need to copy source to dest on the first run.
---
 src/modules/module-filter-chain/dsp-ops-c.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/modules/module-filter-chain/dsp-ops-c.c b/src/modules/module-filter-chain/dsp-ops-c.c
index 4a742a529..99de489be 100644
--- a/src/modules/module-filter-chain/dsp-ops-c.c
+++ b/src/modules/module-filter-chain/dsp-ops-c.c
@@ -158,10 +158,10 @@ void dsp_biquadn_run_c(struct dsp_ops *ops, struct biquad *bq, uint32_t n_bq, ui
 		d = out[i];
 		if (s == NULL || d == NULL)
 			continue;
-		for (j = 0; j < n_bq; j++) {
-			dsp_biquad_run_c(ops, &bq[j], d, s, n_samples);
-			s = d;
-		}
+		if (n_bq > 0)
+			dsp_biquad_run_c(ops, &bq[0], d, s, n_samples);
+		for (j = 1; j < n_bq; j++)
+			dsp_biquad_run_c(ops, &bq[j], d, d, n_samples);
 	}
 }