1 files changed, 92 insertions, 0 deletions
diff --git a/src/Ryujinx.Audio/Renderer/Dsp/Command/DepopForMixBuffersCommand.cs b/src/Ryujinx.Audio/Renderer/Dsp/Command/DepopForMixBuffersCommand.cs
new file mode 100644
index 00000000..1dba56e6
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Dsp/Command/DepopForMixBuffersCommand.cs
@@ -0,0 +1,92 @@
+using System;
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class DepopForMixBuffersCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.DepopForMixBuffers;
+
+        public uint EstimatedProcessingTime { get; set; }
+
+        public uint MixBufferOffset { get; }
+
+        public uint MixBufferCount { get; }
+
+        public float Decay { get; }
+
+        public Memory<float> DepopBuffer { get; }
+
+        public DepopForMixBuffersCommand(Memory<float> depopBuffer, uint bufferOffset, uint mixBufferCount, int nodeId, uint sampleRate)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+            MixBufferOffset = bufferOffset;
+            MixBufferCount = mixBufferCount;
+            DepopBuffer = depopBuffer;
+
+            if (sampleRate == 48000)
+            {
+                Decay = 0.962189f;
+            }
+            else // if (sampleRate == 32000)
+            {
+                Decay = 0.943695f;
+            }
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private unsafe float ProcessDepopMix(float* buffer, float depopValue, uint sampleCount)
+        {
+            if (depopValue < 0)
+            {
+                depopValue = -depopValue;
+
+                for (int i = 0; i < sampleCount; i++)
+                {
+                    depopValue = FloatingPointHelper.MultiplyRoundDown(Decay, depopValue);
+
+                    buffer[i] -= depopValue;
+                }
+
+                return -depopValue;
+            }
+            else
+            {
+                for (int i = 0; i < sampleCount; i++)
+                {
+                    depopValue = FloatingPointHelper.MultiplyRoundDown(Decay, depopValue);
+
+                    buffer[i] += depopValue;
+                }
+
+                return depopValue;
+            }
+        }
+
+        public void Process(CommandList context)
+        {
+            Span<float> depopBuffer = DepopBuffer.Span;
+
+            uint bufferCount = Math.Min(MixBufferOffset + MixBufferCount, context.BufferCount);
+
+            for (int i = (int)MixBufferOffset; i < bufferCount; i++)
+            {
+                float depopValue = depopBuffer[i];
+                if (depopValue != 0)
+                {
+                    unsafe
+                    {
+                        float* buffer = (float*)context.GetBufferPointer(i);
+
+                        depopBuffer[i] = ProcessDepopMix(buffer, depopValue, context.SampleCount);
+                    }
+                }
+            }
+        }
+    }
+}
+\ No newline at end of file