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/MemoryPool/MemoryPoolState.cs

@@ -0,0 +1,148 @@
+//
+// 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.Runtime.InteropServices;
+
+using DspAddress = System.UInt64;
+using CpuAddress = System.UInt64;
+
+namespace Ryujinx.Audio.Renderer.Server.MemoryPool
+{
+    /// <summary>
+    /// Server state for a memory pool.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Size = 0x20, Pack = Alignment)]
+    public struct MemoryPoolState
+    {
+        public const int Alignment = 0x10;
+
+        /// <summary>
+        /// The location of the <see cref="MemoryPoolState"/>.
+        /// </summary>
+        public enum LocationType : uint
+        {
+            /// <summary>
+            /// <see cref="MemoryPoolState"/> located on the CPU side for user use.
+            /// </summary>
+            Cpu,
+
+            /// <summary>
+            /// <see cref="MemoryPoolState"/> located on the DSP side for system use.
+            /// </summary>
+            Dsp
+        }
+
+        /// <summary>
+        /// The CPU address associated to the <see cref="MemoryPoolState"/>.
+        /// </summary>
+        public CpuAddress CpuAddress;
+
+        /// <summary>
+        /// The DSP address associated to the <see cref="MemoryPoolState"/>.
+        /// </summary>
+        public DspAddress DspAddress;
+
+        /// <summary>
+        /// The size associated to the <see cref="MemoryPoolState"/>.
+        /// </summary>
+        public ulong Size;
+
+        /// <summary>
+        /// The <see cref="LocationType"/> associated to the <see cref="MemoryPoolState"/>.
+        /// </summary>
+        public LocationType Location;
+
+        /// <summary>
+        /// Set to true if the <see cref="MemoryPoolState"/> is used.
+        /// </summary>
+        [MarshalAs(UnmanagedType.I1)]
+        public bool IsUsed;
+
+        public static unsafe MemoryPoolState* Null => (MemoryPoolState*)IntPtr.Zero.ToPointer();
+
+        /// <summary>
+        /// Create a new <see cref="MemoryPoolState"/> with the given <see cref="LocationType"/>.
+        /// </summary>
+        /// <param name="location">The location type to use.</param>
+        /// <returns>A new <see cref="MemoryPoolState"/> with the given <see cref="LocationType"/>.</returns>
+        public static MemoryPoolState Create(LocationType location)
+        {
+            return new MemoryPoolState
+            {
+                CpuAddress = 0,
+                DspAddress = 0,
+                Size       = 0,
+                Location   = location
+            };
+        }
+
+        /// <summary>
+        /// Set the <see cref="CpuAddress"/> and size of the <see cref="MemoryPoolState"/>.
+        /// </summary>
+        /// <param name="cpuAddress">The <see cref="CpuAddress"/>.</param>
+        /// <param name="size">The size.</param>
+        public void SetCpuAddress(CpuAddress cpuAddress, ulong size)
+        {
+            CpuAddress = cpuAddress;
+            Size       = size;
+        }
+
+        /// <summary>
+        /// Check if the given <see cref="CpuAddress"/> and size is contains in the <see cref="MemoryPoolState"/>.
+        /// </summary>
+        /// <param name="targetCpuAddress">The <see cref="CpuAddress"/>.</param>
+        /// <param name="size">The size.</param>
+        /// <returns>True if the <see cref="CpuAddress"/> is contained inside the <see cref="MemoryPoolState"/>.</returns>
+        public bool Contains(CpuAddress targetCpuAddress, ulong size)
+        {
+            if (CpuAddress <= targetCpuAddress && size + targetCpuAddress <= Size + CpuAddress)
+            {
+                return true;
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// Translate the given CPU address to a DSP address.
+        /// </summary>
+        /// <param name="targetCpuAddress">The <see cref="CpuAddress"/>.</param>
+        /// <param name="size">The size.</param>
+        /// <returns>the target DSP address.</returns>
+        public DspAddress Translate(CpuAddress targetCpuAddress, ulong size)
+        {
+            if (Contains(targetCpuAddress, size) && IsMapped())
+            {
+                ulong offset = targetCpuAddress - CpuAddress;
+
+                return DspAddress + offset;
+            }
+
+            return 0;
+        }
+
+        /// <summary>
+        /// Is the <see cref="MemoryPoolState"/> mapped on the DSP?
+        /// </summary>
+        /// <returns>Returns true if the <see cref="MemoryPoolState"/> is mapped on the DSP.</returns>
+        public bool IsMapped()
+        {
+            return DspAddress != 0;
+        }
+    }
+}