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/Upsampler/UpsamplerManager.cs

@@ -1,101 +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 System;
-using System.Diagnostics;
-
-namespace Ryujinx.Audio.Renderer.Server.Upsampler
-{
-    /// <summary>
-    /// Upsampler manager.
-    /// </summary>
-    public class UpsamplerManager
-    {
-        /// <summary>
-        /// Work buffer for upsampler.
-        /// </summary>
-        private Memory<float> _upSamplerWorkBuffer;
-
-        /// <summary>
-        /// Global lock of the object.
-        /// </summary>
-        private object Lock = new object();
-
-        /// <summary>
-        /// The upsamplers instances.
-        /// </summary>
-        private UpsamplerState[] _upsamplers;
-
-        /// <summary>
-        /// The count of upsamplers.
-        /// </summary>
-        private uint _count;
-
-        /// <summary>
-        /// Create a new <see cref="UpsamplerManager"/>.
-        /// </summary>
-        /// <param name="upSamplerWorkBuffer">Work buffer for upsampler.</param>
-        /// <param name="count">The count of upsamplers.</param>
-        public UpsamplerManager(Memory<float> upSamplerWorkBuffer, uint count)
-        {
-            _upSamplerWorkBuffer = upSamplerWorkBuffer;
-            _count = count;
-
-            _upsamplers = new UpsamplerState[_count];
-        }
-
-        /// <summary>
-        /// Allocate a new <see cref="UpsamplerState"/>.
-        /// </summary>
-        /// <returns>A new <see cref="UpsamplerState"/> or null if out of memory.</returns>
-        public UpsamplerState Allocate()
-        {
-            int workBufferOffset = 0;
-
-            lock (Lock)
-            {
-                for (int i = 0; i < _count; i++)
-                {
-                    if (_upsamplers[i] == null)
-                    {
-                        _upsamplers[i] = new UpsamplerState(this, i, _upSamplerWorkBuffer.Slice(workBufferOffset, RendererConstants.UpSampleEntrySize), RendererConstants.TargetSampleCount);
-
-                        return _upsamplers[i];
-                    }
-
-                    workBufferOffset += RendererConstants.UpSampleEntrySize;
-                }
-            }
-
-            return null;
-        }
-
-        /// <summary>
-        /// Free a <see cref="UpsamplerState"/> at the given index.
-        /// </summary>
-        /// <param name="index">The index of the <see cref="UpsamplerState"/> to free.</param>
-        public void Free(int index)
-        {
-            lock (Lock)
-            {
-                Debug.Assert(_upsamplers[index] != null);
-
-                _upsamplers[index] = null;
-            }
-        }
-    }
-}