From db0fa4b419c74c7e70b2289e4efd5b3ea9af0a33 Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Wed, 15 Apr 2026 09:41:55 +0200
Subject: [PATCH] filter-graph: allow negative Gain in mixer

To allow for polarity changes.

Fixes #5228
---
 spa/plugins/filter-graph/plugin_builtin.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/spa/plugins/filter-graph/plugin_builtin.c b/spa/plugins/filter-graph/plugin_builtin.c
index 3bcde30c9..34a24bbc1 100644
--- a/spa/plugins/filter-graph/plugin_builtin.c
+++ b/spa/plugins/filter-graph/plugin_builtin.c
@@ -201,42 +201,42 @@ static struct spa_fga_port mixer_ports[] = {
 	{ .index = 9,
 	  .name = "Gain 1",
 	  .flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
-	  .def = 1.0f, .min = 0.0f, .max = 10.0f
+	  .def = 1.0f, .min = -10.0f, .max = 10.0f
 	},
 	{ .index = 10,
 	  .name = "Gain 2",
 	  .flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
-	  .def = 1.0f, .min = 0.0f, .max = 10.0f
+	  .def = 1.0f, .min = -10.0f, .max = 10.0f
 	},
 	{ .index = 11,
 	  .name = "Gain 3",
 	  .flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
-	  .def = 1.0f, .min = 0.0f, .max = 10.0f
+	  .def = 1.0f, .min = -10.0f, .max = 10.0f
 	},
 	{ .index = 12,
 	  .name = "Gain 4",
 	  .flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
-	  .def = 1.0f, .min = 0.0f, .max = 10.0f
+	  .def = 1.0f, .min = -10.0f, .max = 10.0f
 	},
 	{ .index = 13,
 	  .name = "Gain 5",
 	  .flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
-	  .def = 1.0f, .min = 0.0f, .max = 10.0f
+	  .def = 1.0f, .min = -10.0f, .max = 10.0f
 	},
 	{ .index = 14,
 	  .name = "Gain 6",
 	  .flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
-	  .def = 1.0f, .min = 0.0f, .max = 10.0f
+	  .def = 1.0f, .min = -10.0f, .max = 10.0f
 	},
 	{ .index = 15,
 	  .name = "Gain 7",
 	  .flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
-	  .def = 1.0f, .min = 0.0f, .max = 10.0f
+	  .def = 1.0f, .min = -10.0f, .max = 10.0f
 	},
 	{ .index = 16,
 	  .name = "Gain 8",
 	  .flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
-	  .def = 1.0f, .min = 0.0f, .max = 10.0f
+	  .def = 1.0f, .min = -10.0f, .max = 10.0f
 	},
 };