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.Audio.Renderer/Server/Sink/DeviceSink.cs

@@ -1,92 +0,0 @@
-//
-// Copyright (c) 2019-2021 Ryujinx
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with this program.  If not, see <https://www.gnu.org/licenses/>.
-//
-
-using Ryujinx.Audio.Renderer.Common;
-using Ryujinx.Audio.Renderer.Parameter;
-using Ryujinx.Audio.Renderer.Parameter.Sink;
-using Ryujinx.Audio.Renderer.Server.MemoryPool;
-using Ryujinx.Audio.Renderer.Server.Upsampler;
-using System;
-using System.Diagnostics;
-using System.Runtime.InteropServices;
-
-namespace Ryujinx.Audio.Renderer.Server.Sink
-{
-    /// <summary>
-    /// Server information for a device sink.
-    /// </summary>
-    public class DeviceSink : BaseSink
-    {
-        /// <summary>
-        /// The downmix coefficients.
-        /// </summary>
-        public float[] DownMixCoefficients;
-
-        /// <summary>
-        /// The device parameters.
-        /// </summary>
-        public DeviceParameter Parameter;
-
-        /// <summary>
-        /// The upsampler instance used by this sink.
-        /// </summary>
-        /// <remarks>Null if no upsampling is needed.</remarks>
-        public UpsamplerState UpsamplerState;
-
-        /// <summary>
-        /// Create a new <see cref="DeviceSink"/>.
-        /// </summary>
-        public DeviceSink()
-        {
-            DownMixCoefficients = new float[4];
-        }
-
-        public override void CleanUp()
-        {
-            UpsamplerState?.Release();
-
-            UpsamplerState = null;
-
-            base.CleanUp();
-        }
-
-        public override SinkType TargetSinkType => SinkType.Device;
-
-        public override void Update(out BehaviourParameter.ErrorInfo errorInfo, ref SinkInParameter parameter, ref SinkOutStatus outStatus, PoolMapper mapper)
-        {
-            Debug.Assert(IsTypeValid(ref parameter));
-
-            ref DeviceParameter inputDeviceParameter = ref MemoryMarshal.Cast<byte, DeviceParameter>(parameter.SpecificData)[0];
-
-            if (parameter.IsUsed != IsUsed)
-            {
-                UpdateStandardParameter(ref parameter);
-                Parameter = inputDeviceParameter;
-            }
-            else
-            {
-                Parameter.DownMixParameterEnabled = inputDeviceParameter.DownMixParameterEnabled;
-                inputDeviceParameter.DownMixParameter.ToSpan().CopyTo(Parameter.DownMixParameter.ToSpan());
-            }
-
-            Parameter.DownMixParameter.ToSpan().CopyTo(DownMixCoefficients.AsSpan());
-
-            errorInfo = new BehaviourParameter.ErrorInfo();
-            outStatus = new SinkOutStatus();
-        }
-    }
-}