Move solution and projects to src

src/Ryujinx.HLE/HOS/Services/Audio/AudioOut/IAudioOut.cs

@@ -0,0 +1,33 @@
+using Ryujinx.Audio.Common;
+using Ryujinx.HLE.HOS.Kernel.Threading;
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Audio.AudioOut
+{
+    interface IAudioOut : IDisposable
+    {
+        AudioDeviceState GetState();
+
+        ResultCode Start();
+
+        ResultCode Stop();
+
+        ResultCode AppendBuffer(ulong bufferTag, ref AudioUserBuffer buffer);
+
+        KEvent RegisterBufferEvent();
+
+        ResultCode GetReleasedBuffers(Span<ulong> releasedBuffers, out uint releasedCount);
+
+        bool ContainsBuffer(ulong bufferTag);
+
+        uint GetBufferCount();
+
+        ulong GetPlayedSampleCount();
+
+        bool FlushBuffers();
+
+        void SetVolume(float volume);
+
+        float GetVolume();
+    }
+}