Code style fixes and nits on the HLE project (#355)

* Some style fixes and nits on ITimeZoneService

* Remove some unneeded usings

* Remove the Ryujinx.HLE.OsHle.Handles namespace

* Remove hbmenu automatic load on process exit

* Rename Ns to Device, rename Os to System, rename SystemState to State

* Move Exceptions and Utilities out of OsHle

* Rename OsHle to HOS

* Rename OsHle folder to HOS

* IManagerDisplayService and ISystemDisplayService style fixes

* BsdError shouldn't be public

* Add a empty new line before using static

* Remove unused file

* Some style fixes on NPDM

* Exit gracefully when the application is closed

* Code style fixes on IGeneralService

* Add 0x prefix on values printed as hex

* Small improvements on finalization code

* Move ProcessId and ThreadId out of AThreadState

* Rename VFs to FileSystem

* FsAccessHeader shouldn't be public. Also fix file names casing

* More case changes on NPDM

* Remove unused files

* Move using to the correct place on NPDM

* Use properties on KernelAccessControlMmio

* Address PR feedback

2 files changed, 177 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Aud/AudioOut/AudioOutData.cs b/Ryujinx.HLE/HOS/Services/Aud/AudioOut/AudioOutData.cs
new file mode 100644
index 00000000..e25ebe66
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Services/Aud/AudioOut/AudioOutData.cs
@@ -0,0 +1,14 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.HLE.HOS.Services.Aud.AudioOut
+{
+    [StructLayout(LayoutKind.Sequential)]
+    struct AudioOutData
+    {
+        public long NextBufferPtr;
+        public long SampleBufferPtr;
+        public long SampleBufferCapacity;
+        public long SampleBufferSize;
+        public long SampleBufferInnerOffset;
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/Services/Aud/AudioOut/IAudioOut.cs b/Ryujinx.HLE/HOS/Services/Aud/AudioOut/IAudioOut.cs
new file mode 100644
index 00000000..81561f04
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Services/Aud/AudioOut/IAudioOut.cs
@@ -0,0 +1,163 @@
+using ChocolArm64.Memory;
+using Ryujinx.Audio;
+using Ryujinx.HLE.HOS.Ipc;
+using Ryujinx.HLE.HOS.Kernel;
+using System;
+using System.Collections.Generic;
+
+namespace Ryujinx.HLE.HOS.Services.Aud.AudioOut
+{
+    class IAudioOut : IpcService, IDisposable
+    {
+        private Dictionary<int, ServiceProcessRequest> m_Commands;
+
+        public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => m_Commands;
+
+        private IAalOutput AudioOut;
+
+        private KEvent ReleaseEvent;
+
+        private int Track;
+
+        public IAudioOut(IAalOutput AudioOut, KEvent ReleaseEvent, int Track)
+        {
+            m_Commands = new Dictionary<int, ServiceProcessRequest>()
+            {
+                { 0, GetAudioOutState              },
+                { 1, StartAudioOut                 },
+                { 2, StopAudioOut                  },
+                { 3, AppendAudioOutBuffer          },
+                { 4, RegisterBufferEvent           },
+                { 5, GetReleasedAudioOutBuffer     },
+                { 6, ContainsAudioOutBuffer        },
+                { 7, AppendAudioOutBufferAuto      },
+                { 8, GetReleasedAudioOutBufferAuto }
+            };
+
+            this.AudioOut     = AudioOut;
+            this.ReleaseEvent = ReleaseEvent;
+            this.Track        = Track;
+        }
+
+        public long GetAudioOutState(ServiceCtx Context)
+        {
+            Context.ResponseData.Write((int)AudioOut.GetState(Track));
+
+            return 0;
+        }
+
+        public long StartAudioOut(ServiceCtx Context)
+        {
+            AudioOut.Start(Track);
+
+            return 0;
+        }
+
+        public long StopAudioOut(ServiceCtx Context)
+        {
+            AudioOut.Stop(Track);
+
+            return 0;
+        }
+
+        public long AppendAudioOutBuffer(ServiceCtx Context)
+        {
+            return AppendAudioOutBufferImpl(Context, Context.Request.SendBuff[0].Position);
+        }
+
+        public long RegisterBufferEvent(ServiceCtx Context)
+        {
+            int Handle = Context.Process.HandleTable.OpenHandle(ReleaseEvent);
+
+            Context.Response.HandleDesc = IpcHandleDesc.MakeCopy(Handle);
+
+            return 0;
+        }
+
+        public long GetReleasedAudioOutBuffer(ServiceCtx Context)
+        {
+            long Position = Context.Request.ReceiveBuff[0].Position;
+            long Size     = Context.Request.ReceiveBuff[0].Size;
+
+            return GetReleasedAudioOutBufferImpl(Context, Position, Size);
+        }
+
+        public long ContainsAudioOutBuffer(ServiceCtx Context)
+        {
+            long Tag = Context.RequestData.ReadInt64();
+
+            Context.ResponseData.Write(AudioOut.ContainsBuffer(Track, Tag) ? 1 : 0);
+
+            return 0;
+        }
+
+        public long AppendAudioOutBufferAuto(ServiceCtx Context)
+        {
+            (long Position, long Size) = Context.Request.GetBufferType0x21();
+
+            return AppendAudioOutBufferImpl(Context, Position);
+        }
+
+        public long AppendAudioOutBufferImpl(ServiceCtx Context, long Position)
+        {
+            long Tag = Context.RequestData.ReadInt64();
+
+            AudioOutData Data = AMemoryHelper.Read<AudioOutData>(
+                Context.Memory,
+                Position);
+
+            byte[] Buffer = Context.Memory.ReadBytes(
+                Data.SampleBufferPtr,
+                Data.SampleBufferSize);
+
+            AudioOut.AppendBuffer(Track, Tag, Buffer);
+
+            return 0;
+        }
+
+        public long GetReleasedAudioOutBufferAuto(ServiceCtx Context)
+        {
+            (long Position, long Size) = Context.Request.GetBufferType0x22();
+
+            return GetReleasedAudioOutBufferImpl(Context, Position, Size);
+        }
+
+        public long GetReleasedAudioOutBufferImpl(ServiceCtx Context, long Position, long Size)
+        {
+            uint Count = (uint)((ulong)Size >> 3);
+
+            long[] ReleasedBuffers = AudioOut.GetReleasedBuffers(Track, (int)Count);
+
+            for (uint Index = 0; Index < Count; Index++)
+            {
+                long Tag = 0;
+
+                if (Index < ReleasedBuffers.Length)
+                {
+                    Tag = ReleasedBuffers[Index];
+                }
+
+                Context.Memory.WriteInt64(Position + Index * 8, Tag);
+            }
+
+            Context.ResponseData.Write(ReleasedBuffers.Length);
+
+            return 0;
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool Disposing)
+        {
+            if (Disposing)
+            {
+                AudioOut.CloseTrack(Track);
+
+                ReleaseEvent.Dispose();
+            }
+        }
+    }
+}