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.Backends.OpenAL/OpenALHardwareDeviceSession.cs

@@ -0,0 +1,213 @@
+using OpenTK.Audio.OpenAL;
+using Ryujinx.Audio.Backends.Common;
+using Ryujinx.Audio.Common;
+using Ryujinx.Memory;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Backends.OpenAL
+{
+    class OpenALHardwareDeviceSession : HardwareDeviceSessionOutputBase
+    {
+        private OpenALHardwareDeviceDriver _driver;
+        private int _sourceId;
+        private ALFormat _targetFormat;
+        private bool _isActive;
+        private Queue<OpenALAudioBuffer> _queuedBuffers;
+        private ulong _playedSampleCount;
+
+        private object _lock = new object();
+
+        public OpenALHardwareDeviceSession(OpenALHardwareDeviceDriver driver, IVirtualMemoryManager memoryManager, SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount) : base(memoryManager, requestedSampleFormat, requestedSampleRate, requestedChannelCount)
+        {
+            _driver = driver;
+            _queuedBuffers = new Queue<OpenALAudioBuffer>();
+            _sourceId = AL.GenSource();
+            _targetFormat = GetALFormat();
+            _isActive = false;
+            _playedSampleCount = 0;
+        }
+
+        private ALFormat GetALFormat()
+        {
+            switch (RequestedSampleFormat)
+            {
+                case SampleFormat.PcmInt16:
+                    switch (RequestedChannelCount)
+                    {
+                        case 1:
+                            return ALFormat.Mono16;
+                        case 2:
+                            return ALFormat.Stereo16;
+                        case 6:
+                            return ALFormat.Multi51Chn16Ext;
+                        default:
+                            throw new NotImplementedException($"Unsupported channel config {RequestedChannelCount}");
+                    }
+                default:
+                    throw new NotImplementedException($"Unsupported sample format {RequestedSampleFormat}");
+            }
+        }
+
+        public override void PrepareToClose() { }
+
+        private void StartIfNotPlaying()
+        {
+            AL.GetSource(_sourceId, ALGetSourcei.SourceState, out int stateInt);
+
+            ALSourceState State = (ALSourceState)stateInt;
+
+            if (State != ALSourceState.Playing)
+            {
+                AL.SourcePlay(_sourceId);
+            }
+        }
+
+        public override void QueueBuffer(AudioBuffer buffer)
+        {
+            lock (_lock)
+            {
+                OpenALAudioBuffer driverBuffer = new OpenALAudioBuffer
+                {
+                    DriverIdentifier = buffer.DataPointer,
+                    BufferId         = AL.GenBuffer(),
+                    SampleCount      = GetSampleCount(buffer)
+                };
+
+                AL.BufferData(driverBuffer.BufferId, _targetFormat, buffer.Data, (int)buffer.DataSize, (int)RequestedSampleRate);
+
+                _queuedBuffers.Enqueue(driverBuffer);
+
+                AL.SourceQueueBuffer(_sourceId, driverBuffer.BufferId);
+
+                if (_isActive)
+                {
+                    StartIfNotPlaying();
+                }
+            }
+        }
+
+        public override void SetVolume(float volume)
+        {
+            lock (_lock)
+            {
+                AL.Source(_sourceId, ALSourcef.Gain, volume);
+            }
+        }
+
+        public override float GetVolume()
+        {
+            AL.GetSource(_sourceId, ALSourcef.Gain, out float volume);
+
+            return volume;
+        }
+
+        public override void Start()
+        {
+            lock (_lock)
+            {
+                _isActive = true;
+
+                StartIfNotPlaying();
+            }
+        }
+
+        public override void Stop()
+        {
+            lock (_lock)
+            {
+                SetVolume(0.0f);
+
+                AL.SourceStop(_sourceId);
+
+                _isActive = false;
+            }
+        }
+
+        public override void UnregisterBuffer(AudioBuffer buffer) {}
+
+        public override bool WasBufferFullyConsumed(AudioBuffer buffer)
+        {
+            lock (_lock)
+            {
+                if (!_queuedBuffers.TryPeek(out OpenALAudioBuffer driverBuffer))
+                {
+                    return true;
+                }
+
+                return driverBuffer.DriverIdentifier != buffer.DataPointer;
+            }
+        }
+
+        public override ulong GetPlayedSampleCount()
+        {
+            lock (_lock)
+            {
+                return _playedSampleCount;
+            }
+        }
+
+        public bool Update()
+        {
+            lock (_lock)
+            {
+                if (_isActive)
+                {
+                    AL.GetSource(_sourceId, ALGetSourcei.BuffersProcessed, out int releasedCount);
+
+                    if (releasedCount > 0)
+                    {
+                        int[] bufferIds = new int[releasedCount];
+
+                        AL.SourceUnqueueBuffers(_sourceId, releasedCount, bufferIds);
+
+                        int i = 0;
+
+                        while (_queuedBuffers.TryPeek(out OpenALAudioBuffer buffer) && i < bufferIds.Length)
+                        {
+                            if (buffer.BufferId == bufferIds[i])
+                            {
+                                _playedSampleCount += buffer.SampleCount;
+
+                                _queuedBuffers.TryDequeue(out _);
+
+                                i++;
+                            }
+                        }
+
+                        Debug.Assert(i < bufferIds.Length, "Unknown buffer id");
+
+                        AL.DeleteBuffers(bufferIds);
+                    }
+
+                    return releasedCount > 0;
+                }
+
+                return false;
+            }
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                lock (_lock)
+                {
+                    PrepareToClose();
+                    Stop();
+
+                    AL.DeleteSource(_sourceId);
+
+                    _driver.Unregister(this);
+                }
+            }
+        }
+
+        public override void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+    }
+}