Migrate Audio service to new IPC (#6285)

* Migrate audren to new IPC

* Migrate audout

* Migrate audin

* Migrate hwopus

* Bye bye old audio service

* Switch volume control to IHardwareDeviceDriver

* Somewhat unrelated changes

* Remove Concentus reference from HLE

* Implement OpenAudioRendererForManualExecution

* Remove SetVolume/GetVolume methods that are not necessary

* Remove SetVolume/GetVolume methods that are not necessary (2)

* Fix incorrect volume update

* PR feedback

* PR feedback

* Stub audrec

* Init outParameter

* Make FinalOutputRecorderParameter/Internal readonly

* Make FinalOutputRecorder IDisposable

* Fix HardwareOpusDecoderManager parameter buffers

* Opus work buffer size and error handling improvements

* Add AudioInProtocolName enum

* Fix potential divisions by zero

src/Ryujinx.Horizon/Sdk/Audio/AudioEvent.cs

@@ -0,0 +1,50 @@
+using Ryujinx.Audio.Integration;
+using Ryujinx.Horizon.Common;
+using Ryujinx.Horizon.Sdk.OsTypes;
+using System;
+
+namespace Ryujinx.Horizon.Sdk.Audio
+{
+    class AudioEvent : IWritableEvent, IDisposable
+    {
+        private SystemEventType _systemEvent;
+        private readonly IExternalEvent _externalEvent;
+
+        public AudioEvent()
+        {
+            Os.CreateSystemEvent(out _systemEvent, EventClearMode.ManualClear, interProcess: true);
+
+            // We need to do this because the event will be signalled from a different thread.
+            _externalEvent = HorizonStatic.Syscall.GetExternalEvent(Os.GetWritableHandleOfSystemEvent(ref _systemEvent));
+        }
+
+        public void Signal()
+        {
+            _externalEvent.Signal();
+        }
+
+        public void Clear()
+        {
+            _externalEvent.Clear();
+        }
+
+        public int GetReadableHandle()
+        {
+            return Os.GetReadableHandleOfSystemEvent(ref _systemEvent);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                Os.DestroySystemEvent(ref _systemEvent);
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+    }
+}