1 files changed, 24 insertions, 0 deletions
diff --git a/src/Godosa.Core/Audio/Pcm.cs b/src/Godosa.Core/Audio/Pcm.cs
new file mode 100644
index 0000000..2af554a
--- /dev/null
+++ b/src/Godosa.Core/Audio/Pcm.cs
@@ -0,0 +1,24 @@
+using System;
+
+namespace Godosa.Core.Audio;
+
+/// <summary>16-bit mono PCM helpers.</summary>
+public static class Pcm
+{
+    public const int SampleRate = 44100;
+
+    /// <summary>Interleaved float frames (e.g. decoded OGG) → mono 16-bit.</summary>
+    public static short[] Downmix(float[] interleaved, int channels)
+    {
+        var pcm = new short[interleaved.Length / channels];
+        for (int f = 0; f < pcm.Length; f++)
+        {
+            float sum = 0f;
+            for (int c = 0; c < channels; c++) sum += interleaved[f * channels + c];
+            pcm[f] = ToShort(sum / channels);
+        }
+        return pcm;
+    }
+
+    public static short ToShort(float sample) => (short)Math.Clamp(MathF.Round(sample * short.MaxValue), -short.MaxValue, short.MaxValue);
+}