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/RendererSystemContext.cs

@@ -1,65 +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.Server.Upsampler;
-using System;
-
-namespace Ryujinx.Audio.Renderer.Server
-{
-    /// <summary>
-    /// Represents a lite version of <see cref="AudioRenderSystem"/> used by the <see cref="Dsp.AudioProcessor"/>
-    /// </summary>
-    /// <remarks>
-    /// This also allows to reduce dependencies on the <see cref="AudioRenderSystem"/> for unit testing.
-    /// </remarks>
-    public sealed class RendererSystemContext
-    {
-        /// <summary>
-        /// The session id of the current renderer.
-        /// </summary>
-        public int SessionId;
-
-        /// <summary>
-        /// The target channel count for sink.
-        /// </summary>
-        /// <remarks>See <see cref="CommandGenerator.GenerateDevice(Sink.DeviceSink, ref Mix.MixState)"/> for usage.</remarks>
-        public uint ChannelCount;
-
-        /// <summary>
-        /// The total count of mix buffer.
-        /// </summary>
-        public uint MixBufferCount;
-
-        /// <summary>
-        /// Instance of the <see cref="BehaviourContext"/> used to derive bug fixes and features of the current audio renderer revision.
-        /// </summary>
-        public BehaviourContext BehaviourContext;
-
-        /// <summary>
-        /// Instance of the <see cref="UpsamplerManager"/> used for upsampling (see <see cref="UpsamplerState"/>)
-        /// </summary>
-        public UpsamplerManager UpsamplerManager;
-
-        /// <summary>
-        /// The memory to use for depop processing.
-        /// </summary>
-        /// <remarks>
-        /// See <see cref="Dsp.Command.DepopForMixBuffersCommand"/> and <see cref="Dsp.Command.DepopPrepareCommand"/>
-        /// </remarks>
-        public Memory<float> DepopBuffer;
-    }
-}