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.HLE/Switch.cs

@@ -1,5 +1,6 @@
 using LibHac.FsSystem;
-using Ryujinx.Audio;
+using Ryujinx.Audio.Backends.CompatLayer;
+using Ryujinx.Audio.Integration;
 using Ryujinx.Common;
 using Ryujinx.Configuration;
 using Ryujinx.Graphics.GAL;
@@ -22,7 +23,7 @@ namespace Ryujinx.HLE
 {
     public class Switch : IDisposable
     {
-        public IAalOutput AudioOut { get; private set; }
+        public IHardwareDeviceDriver AudioDeviceDriver { get; private set; }
 
         internal MemoryBlock Memory { get; private set; }
 
@@ -48,16 +49,16 @@ namespace Ryujinx.HLE
 
         public bool EnableDeviceVsync { get; set; } = true;
 
-        public Switch(VirtualFileSystem fileSystem, ContentManager contentManager, UserChannelPersistence userChannelPersistence, IRenderer renderer, IAalOutput audioOut)
+        public Switch(VirtualFileSystem fileSystem, ContentManager contentManager, UserChannelPersistence userChannelPersistence, IRenderer renderer, IHardwareDeviceDriver audioDeviceDriver)
         {
             if (renderer == null)
             {
                 throw new ArgumentNullException(nameof(renderer));
             }
 
-            if (audioOut == null)
+            if (audioDeviceDriver == null)
             {
-                throw new ArgumentNullException(nameof(audioOut));
+                throw new ArgumentNullException(nameof(audioDeviceDriver));
             }
 
             if (userChannelPersistence == null)
@@ -67,7 +68,7 @@ namespace Ryujinx.HLE
 
             UserChannelPersistence = userChannelPersistence;
 
-            AudioOut = audioOut;
+            AudioDeviceDriver = new CompatLayerHardwareDeviceDriver(audioDeviceDriver);
 
             Memory = new MemoryBlock(1UL << 32);
 
@@ -210,7 +211,7 @@ namespace Ryujinx.HLE
 
                 System.Dispose();
                 Host1x.Dispose();
-                AudioOut.Dispose();
+                AudioDeviceDriver.Dispose();
                 FileSystem.Unload();
                 Memory.Dispose();
             }