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

1 files changed, 151 insertions, 0 deletions

diff --git a/Ryujinx.Audio/Renderer/Server/MemoryPool/AddressInfo.cs b/Ryujinx.Audio/Renderer/Server/MemoryPool/AddressInfo.cs
new file mode 100644
index 00000000..2b625d06
--- /dev/null
+++ b/Ryujinx.Audio/Renderer/Server/MemoryPool/AddressInfo.cs
@@ -0,0 +1,151 @@
+//
+// 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>
+    /// Represents the information of a region shared between the CPU and DSP. 
+    /// </summary>
+    public struct AddressInfo
+    {
+        /// <summary>
+        /// The target CPU address of the region.
+        /// </summary>
+        public CpuAddress CpuAddress;
+
+        /// <summary>
+        /// The size of the region.
+        /// </summary>
+        public ulong Size;
+
+        private unsafe MemoryPoolState* _memoryPools;
+
+        /// <summary>
+        /// The forced DSP address of the region.
+        /// </summary>
+        public DspAddress ForceMappedDspAddress;
+
+        private unsafe ref MemoryPoolState MemoryPoolState => ref *_memoryPools;
+
+        public unsafe bool HasMemoryPoolState => (IntPtr)_memoryPools != IntPtr.Zero;
+
+        /// <summary>
+        /// Create an new empty <see cref="AddressInfo"/>.
+        /// </summary>
+        /// <returns>A new empty <see cref="AddressInfo"/>.</returns>
+        public static AddressInfo Create()
+        {
+            return Create(0, 0);
+        }
+
+        /// <summary>
+        /// Create a new <see cref="AddressInfo"/>.
+        /// </summary>
+        /// <param name="cpuAddress">The target <see cref="CpuAddress"/> of the region.</param>
+        /// <param name="size">The target size of the region.</param>
+        /// <returns>A new <see cref="AddressInfo"/>.</returns>
+        public static AddressInfo Create(CpuAddress cpuAddress, ulong size)
+        {
+            unsafe
+            {
+                return new AddressInfo
+                {
+                    CpuAddress            = cpuAddress,
+                    _memoryPools       = MemoryPoolState.Null,
+                    Size                  = size,
+                    ForceMappedDspAddress = 0
+                };
+            }
+        }
+
+        /// <summary>
+        /// Setup the CPU address and size of the <see cref="AddressInfo"/>.
+        /// </summary>
+        /// <param name="cpuAddress">The target <see cref="CpuAddress"/> of the region.</param>
+        /// <param name="size">The size of the region.</param>
+        public void Setup(CpuAddress cpuAddress, ulong size)
+        {
+            CpuAddress            = cpuAddress;
+            Size                  = size;
+            ForceMappedDspAddress = 0;
+
+            unsafe
+            {
+                _memoryPools = MemoryPoolState.Null;
+            }
+        }
+
+        /// <summary>
+        /// Set the <see cref="MemoryPoolState"/> associated.
+        /// </summary>
+        /// <param name="memoryPoolState">The <see cref="MemoryPoolState"/> associated.</param>
+        public void SetupMemoryPool(Span<MemoryPoolState> memoryPoolState)
+        {
+            unsafe
+            {
+                fixed (MemoryPoolState* ptr = &MemoryMarshal.GetReference(memoryPoolState))
+                {
+                    SetupMemoryPool(ptr);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Set the <see cref="MemoryPoolState"/> associated.
+        /// </summary>
+        /// <param name="memoryPoolState">The <see cref="MemoryPoolState"/> associated.</param>
+        public unsafe void SetupMemoryPool(MemoryPoolState* memoryPoolState)
+        {
+            _memoryPools = memoryPoolState;
+        }
+
+        /// <summary>
+        /// Check if the <see cref="MemoryPoolState"/> is mapped.
+        /// </summary>
+        /// <returns>Returns true if the <see cref="MemoryPoolState"/> is mapped.</returns>
+        public bool HasMappedMemoryPool()
+        {
+            return HasMemoryPoolState && MemoryPoolState.IsMapped();
+        }
+
+        /// <summary>
+        /// Get the DSP address associated to the <see cref="AddressInfo"/>.
+        /// </summary>
+        /// <param name="markUsed">If true, mark the <see cref="MemoryPoolState"/> as used.</param>
+        /// <returns>Returns the DSP address associated to the <see cref="AddressInfo"/>.</returns>
+        public DspAddress GetReference(bool markUsed)
+        {
+            if (!HasMappedMemoryPool())
+            {
+                return ForceMappedDspAddress;
+            }
+
+            if (markUsed)
+            {
+                MemoryPoolState.IsUsed = true;
+            }
+
+            return MemoryPoolState.Translate(CpuAddress, Size);
+        }
+    }
+}