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/HOS/Services/Audio/AudioOut/AudioOutServer.cs

@@ -0,0 +1,190 @@
+using Ryujinx.Audio.Common;
+using Ryujinx.Cpu;
+using Ryujinx.HLE.HOS.Ipc;
+using Ryujinx.HLE.HOS.Kernel.Common;
+using Ryujinx.HLE.HOS.Kernel.Threading;
+using Ryujinx.Memory;
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.HLE.HOS.Services.Audio.AudioOut
+{
+    class AudioOutServer : IpcService, IDisposable
+    {
+        private IAudioOut _impl;
+
+        public AudioOutServer(IAudioOut impl)
+        {
+            _impl = impl;
+        }
+
+        [Command(0)]
+        // GetAudioOutState() -> u32 state
+        public ResultCode GetAudioOutState(ServiceCtx context)
+        {
+            context.ResponseData.Write((uint)_impl.GetState());
+
+            return ResultCode.Success;
+        }
+
+        [Command(1)]
+        // Start()
+        public ResultCode Start(ServiceCtx context)
+        {
+            return _impl.Start();
+        }
+
+        [Command(2)]
+        // Stop()
+        public ResultCode Stop(ServiceCtx context)
+        {
+            return _impl.Stop();
+        }
+
+        [Command(3)]
+        // AppendAudioOutBuffer(u64 bufferTag, buffer<nn::audio::AudioOutBuffer, 5> buffer)
+        public ResultCode AppendAudioOutBuffer(ServiceCtx context)
+        {
+            long position = context.Request.SendBuff[0].Position;
+
+            ulong bufferTag = context.RequestData.ReadUInt64();
+
+            AudioUserBuffer data = MemoryHelper.Read<AudioUserBuffer>(context.Memory, position);
+
+            return _impl.AppendBuffer(bufferTag, ref data);
+        }
+
+        [Command(4)]
+        // RegisterBufferEvent() -> handle<copy>
+        public ResultCode RegisterBufferEvent(ServiceCtx context)
+        {
+            KEvent bufferEvent = _impl.RegisterBufferEvent();
+
+            if (context.Process.HandleTable.GenerateHandle(bufferEvent.ReadableEvent, out int handle) != KernelResult.Success)
+            {
+                throw new InvalidOperationException("Out of handles!");
+            }
+
+            context.Response.HandleDesc = IpcHandleDesc.MakeCopy(handle);
+
+            return ResultCode.Success;
+        }
+
+        [Command(5)]
+        // GetReleasedAudioOutBuffers() -> (u32 count, buffer<u64, 6> tags)
+        public ResultCode GetReleasedAudioOutBuffers(ServiceCtx context)
+        {
+            long position = context.Request.ReceiveBuff[0].Position;
+            long size = context.Request.ReceiveBuff[0].Size;
+
+            using (WritableRegion outputRegion = context.Memory.GetWritableRegion((ulong)position, (int)size))
+            {
+                ResultCode result = _impl.GetReleasedBuffers(MemoryMarshal.Cast<byte, ulong>(outputRegion.Memory.Span), out uint releasedCount);
+
+                context.ResponseData.Write(releasedCount);
+
+                return result;
+            }
+        }
+
+        [Command(6)]
+        // ContainsAudioOutBuffer(u64 tag) -> b8
+        public ResultCode ContainsAudioOutBuffer(ServiceCtx context)
+        {
+            ulong bufferTag = context.RequestData.ReadUInt64();
+
+            context.ResponseData.Write(_impl.ContainsBuffer(bufferTag));
+
+            return ResultCode.Success;
+        }
+
+        [Command(7)] // 3.0.0+
+        // AppendAudioOutBufferAuto(u64 tag, buffer<nn::audio::AudioOutBuffer, 0x21>)
+        public ResultCode AppendAudioOutBufferAuto(ServiceCtx context)
+        {
+            (long position, _) = context.Request.GetBufferType0x21();
+
+            ulong bufferTag = context.RequestData.ReadUInt64();
+
+            AudioUserBuffer data = MemoryHelper.Read<AudioUserBuffer>(context.Memory, position);
+
+            return _impl.AppendBuffer(bufferTag, ref data);
+        }
+
+        [Command(8)] // 3.0.0+
+        // GetReleasedAudioOutBuffersAuto() -> (u32 count, buffer<u64, 0x22> tags)
+        public ResultCode GetReleasedAudioOutBuffersAuto(ServiceCtx context)
+        {
+            (long position, long size) = context.Request.GetBufferType0x22();
+
+            using (WritableRegion outputRegion = context.Memory.GetWritableRegion((ulong)position, (int)size))
+            {
+                ResultCode result = _impl.GetReleasedBuffers(MemoryMarshal.Cast<byte, ulong>(outputRegion.Memory.Span), out uint releasedCount);
+
+                context.ResponseData.Write(releasedCount);
+
+                return result;
+            }
+        }
+
+        [Command(9)] // 4.0.0+
+        // GetAudioOutBufferCount() -> u32
+        public ResultCode GetAudioOutBufferCount(ServiceCtx context)
+        {
+            context.ResponseData.Write(_impl.GetBufferCount());
+
+            return ResultCode.Success;
+        }
+
+        [Command(10)] // 4.0.0+
+        // GetAudioOutPlayedSampleCount() -> u64
+        public ResultCode GetAudioOutPlayedSampleCount(ServiceCtx context)
+        {
+            context.ResponseData.Write(_impl.GetPlayedSampleCount());
+
+            return ResultCode.Success;
+        }
+
+        [Command(11)] // 4.0.0+
+        // FlushAudioOutBuffers() -> b8
+        public ResultCode FlushAudioOutBuffers(ServiceCtx context)
+        {
+            context.ResponseData.Write(_impl.FlushBuffers());
+
+            return ResultCode.Success;
+        }
+
+        [Command(12)] // 6.0.0+
+        // SetAudioOutVolume(s32)
+        public ResultCode SetAudioOutVolume(ServiceCtx context)
+        {
+            float volume = context.RequestData.ReadSingle();
+
+            _impl.SetVolume(volume);
+
+            return ResultCode.Success;
+        }
+
+        [Command(13)] // 6.0.0+
+        // GetAudioOutVolume() -> s32
+        public ResultCode GetAudioOutVolume(ServiceCtx context)
+        {
+            context.ResponseData.Write(_impl.GetVolume());
+
+            return ResultCode.Success;
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _impl.Dispose();
+            }
+        }
+    }
+}