Haydn: Part 1 (#2007)

* Haydn: Part 1

Based on my reverse of audio 11.0.0.

As always, core implementation under LGPLv3 for the same reasons as for Amadeus.

This place the bases of a more flexible audio system while making audout & audin accurate.

This have the following improvements:
- Complete reimplementation of audout and audin.
- Audin currently only have a dummy backend.
- Dramatically reduce CPU usage by up to 50% in common cases (SoundIO and OpenAL).
- Audio Renderer now can output to 5.1 devices when supported.
- Audio Renderer init its backend on demand instead of keeping two up all the time.
- All backends implementation are now in their own project.
- Ryujinx.Audio.Renderer was renamed Ryujinx.Audio and was refactored because of this.

As a note, games having issues with OpenAL haven't improved and will not
because of OpenAL design (stopping when buffers finish playing causing
possible audio "pops" when buffers are very small).

* Update for latest hexkyz's edits on Switchbrew

* audren: Rollback channel configuration changes

* Address gdkchan's comments

* Fix typo in OpenAL backend driver

* Address last comments

* Fix a nit

* Address gdkchan's comments

Ryujinx.HLE/HOS/Services/Audio/AudioIn/AudioIn.cs

@@ -0,0 +1,108 @@
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Input;
+using Ryujinx.Audio.Integration;
+using Ryujinx.HLE.HOS.Kernel;
+using Ryujinx.HLE.HOS.Kernel.Threading;
+using Ryujinx.HLE.HOS.Services.Audio.AudioRenderer;
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Audio.AudioIn
+{
+    class AudioIn : IAudioIn
+    {
+        private AudioInputSystem _system;
+        private uint _processHandle;
+        private KernelContext _kernelContext;
+
+        public AudioIn(AudioInputSystem system, KernelContext kernelContext, uint processHandle)
+        {
+            _system = system;
+            _kernelContext = kernelContext;
+            _processHandle = processHandle;
+        }
+
+        public ResultCode AppendBuffer(ulong bufferTag, ref AudioUserBuffer buffer)
+        {
+            return (ResultCode)_system.AppendBuffer(bufferTag, ref buffer);
+        }
+
+        public ResultCode AppendUacBuffer(ulong bufferTag, ref AudioUserBuffer buffer, uint handle)
+        {
+            return (ResultCode)_system.AppendUacBuffer(bufferTag, ref buffer, handle);
+        }
+
+        public bool ContainsBuffer(ulong bufferTag)
+        {
+            return _system.ContainsBuffer(bufferTag);
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _system.Dispose();
+
+                _kernelContext.Syscall.CloseHandle((int)_processHandle);
+            }
+        }
+
+        public bool FlushBuffers()
+        {
+            return _system.FlushBuffers();
+        }
+
+        public uint GetBufferCount()
+        {
+            return _system.GetBufferCount();
+        }
+
+        public ResultCode GetReleasedBuffers(Span<ulong> releasedBuffers, out uint releasedCount)
+        {
+            return (ResultCode)_system.GetReleasedBuffers(releasedBuffers, out releasedCount);
+        }
+
+        public AudioDeviceState GetState()
+        {
+            return _system.GetState();
+        }
+
+        public float GetVolume()
+        {
+            return _system.GetVolume();
+        }
+
+        public KEvent RegisterBufferEvent()
+        {
+            IWritableEvent outEvent = _system.RegisterBufferEvent();
+
+            if (outEvent is AudioKernelEvent)
+            {
+                return ((AudioKernelEvent)outEvent).Event;
+            }
+            else
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public void SetVolume(float volume)
+        {
+            _system.SetVolume(volume);
+        }
+
+        public ResultCode Start()
+        {
+            return (ResultCode)_system.Start();
+        }
+
+        public ResultCode Stop()
+        {
+            return (ResultCode)_system.Stop();
+        }
+    }
+}