From 40311310d1a6d2fde2ee9f04bfa1f21ced7cbee2 Mon Sep 17 00:00:00 2001
From: Mary-nyan <mary@mary.zone>
Date: Tue, 6 Dec 2022 15:04:25 +0100
Subject: amadeus: Add missing compressor effect from REV11 (#4010)

* amadeus: Add missing compressor effect from REV11

This was in my reversing notes but seems I completely forgot to
implement it

Also took the opportunity to simplify the Limiter effect a bit.

* Remove some outdated comment

* Address gdkchan's comments
---
 .../Dsp/Effect/ExponentialMovingAverage.cs         | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 Ryujinx.Audio/Renderer/Dsp/Effect/ExponentialMovingAverage.cs

(limited to 'Ryujinx.Audio/Renderer/Dsp/Effect/ExponentialMovingAverage.cs')

diff --git a/Ryujinx.Audio/Renderer/Dsp/Effect/ExponentialMovingAverage.cs b/Ryujinx.Audio/Renderer/Dsp/Effect/ExponentialMovingAverage.cs
new file mode 100644
index 00000000..78e46bf9
--- /dev/null
+++ b/Ryujinx.Audio/Renderer/Dsp/Effect/ExponentialMovingAverage.cs
@@ -0,0 +1,26 @@
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Effect
+{
+    public struct ExponentialMovingAverage
+    {
+        private float _mean;
+
+        public ExponentialMovingAverage(float mean)
+        {
+            _mean = mean;
+        }
+
+        public float Read()
+        {
+            return _mean;
+        }
+
+        public float Update(float value, float alpha)
+        {
+            _mean += alpha * (value - _mean);
+
+            return _mean;
+        }
+    }
+}
-- 
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