Move solution and projects to src

src/Ryujinx.Audio.Backends.SDL2/SDL2AudioBuffer.cs

@@ -0,0 +1,16 @@
+namespace Ryujinx.Audio.Backends.SDL2
+{
+    class SDL2AudioBuffer
+    {
+        public readonly ulong DriverIdentifier;
+        public readonly ulong SampleCount;
+        public ulong SamplePlayed;
+
+        public SDL2AudioBuffer(ulong driverIdentifier, ulong sampleCount)
+        {
+            DriverIdentifier = driverIdentifier;
+            SampleCount = sampleCount;
+            SamplePlayed = 0;
+        }
+    }
+}