Move solution and projects to src

src/Ryujinx.Audio/Renderer/Device/VirtualDevice.cs

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+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Renderer.Device
+{
+    /// <summary>
+    /// Represents a virtual device used by IAudioDevice.
+    /// </summary>
+    public class VirtualDevice
+    {
+        /// <summary>
+        /// All the defined virtual devices.
+        /// </summary>
+        public static readonly VirtualDevice[] Devices = new VirtualDevice[5]
+        {
+            new VirtualDevice("AudioStereoJackOutput", 2, true),
+            new VirtualDevice("AudioBuiltInSpeakerOutput", 2, false),
+            new VirtualDevice("AudioTvOutput", 6, false),
+            new VirtualDevice("AudioUsbDeviceOutput", 2, true),
+            new VirtualDevice("AudioExternalOutput", 6, true),
+        };
+
+        /// <summary>
+        /// The name of the <see cref="VirtualDevice"/>.
+        /// </summary>
+        public string Name { get; }
+
+        /// <summary>
+        /// The count of channels supported by the <see cref="VirtualDevice"/>.
+        /// </summary>
+        public uint ChannelCount { get; }
+
+        /// <summary>
+        /// The system master volume of the <see cref="VirtualDevice"/>.
+        /// </summary>
+        public float MasterVolume { get; private set; }
+
+        /// <summary>
+        /// Define if the <see cref="VirtualDevice"/> is provided by an external interface.
+        /// </summary>
+        public bool IsExternalOutput { get; }
+
+        /// <summary>
+        /// Create a new <see cref="VirtualDevice"/> instance.
+        /// </summary>
+        /// <param name="name">The name of the <see cref="VirtualDevice"/>.</param>
+        /// <param name="channelCount">The count of channels supported by the <see cref="VirtualDevice"/>.</param>
+        /// <param name="isExternalOutput">Indicate if the <see cref="VirtualDevice"/> is provided by an external interface.</param>
+        private VirtualDevice(string name, uint channelCount, bool isExternalOutput)
+        {
+            Name = name;
+            ChannelCount = channelCount;
+            IsExternalOutput = isExternalOutput;
+        }
+
+        /// <summary>
+        /// Update the master volume of the <see cref="VirtualDevice"/>.
+        /// </summary>
+        /// <param name="volume">The new master volume.</param>
+        public void UpdateMasterVolume(float volume)
+        {
+            Debug.Assert(volume >= 0.0f && volume <= 1.0f);
+
+            MasterVolume = volume;
+        }
+
+        /// <summary>
+        /// Check if the <see cref="VirtualDevice"/> is a usb device.
+        /// </summary>
+        /// <returns>Returns true if the <see cref="VirtualDevice"/> is a usb device.</returns>
+        public bool IsUsbDevice()
+        {
+            return Name.Equals("AudioUsbDeviceOutput");
+        }
+
+        /// <summary>
+        /// Get the output device name of the <see cref="VirtualDevice"/>.
+        /// </summary>
+        /// <returns>The output device name of the <see cref="VirtualDevice"/>.</returns>
+        public string GetOutputDeviceName()
+        {
+            if (IsExternalOutput)
+            {
+                return "AudioExternalOutput";
+            }
+
+            return Name;
+        }
+    }
+}

src/Ryujinx.Audio/Renderer/Device/VirtualDeviceSession.cs

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+namespace Ryujinx.Audio.Renderer.Device
+{
+    /// <summary>
+    /// Represents a virtual device session used by IAudioDevice.
+    /// </summary>
+    public class VirtualDeviceSession
+    {
+        /// <summary>
+        /// The <see cref="VirtualDevice"/> associated to this session.
+        /// </summary>
+        public VirtualDevice Device { get; }
+
+        /// <summary>
+        /// The user volume of this session.
+        /// </summary>
+        public float Volume { get; set; }
+
+        /// <summary>
+        /// Create a new <see cref="VirtualDeviceSession"/> instance.
+        /// </summary>
+        /// <param name="virtualDevice">The <see cref="VirtualDevice"/> associated to this session.</param>
+        public VirtualDeviceSession(VirtualDevice virtualDevice)
+        {
+            Device = virtualDevice;
+        }
+    }
+}

src/Ryujinx.Audio/Renderer/Device/VirtualDeviceSessionRegistry.cs

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+using System.Collections.Generic;
+
+namespace Ryujinx.Audio.Renderer.Device
+{
+    /// <summary>
+    /// Represent an instance containing a registry of <see cref="VirtualDeviceSession"/>.
+    /// </summary>
+    public class VirtualDeviceSessionRegistry
+    {
+        /// <summary>
+        /// The session registry, used to store the sessions of a given AppletResourceId.
+        /// </summary>
+        private Dictionary<ulong, VirtualDeviceSession[]> _sessionsRegistry = new Dictionary<ulong, VirtualDeviceSession[]>();
+
+        /// <summary>
+        /// The default <see cref="VirtualDevice"/>.
+        /// </summary>
+        /// <remarks>This is used when the USB device is the default one on older revision.</remarks>
+        public VirtualDevice DefaultDevice => VirtualDevice.Devices[0];
+
+        /// <summary>
+        /// The current active <see cref="VirtualDevice"/>.
+        /// </summary>
+        // TODO: make this configurable
+        public VirtualDevice ActiveDevice = VirtualDevice.Devices[2];
+
+        /// <summary>
+        /// Get the associated <see cref="T:VirtualDeviceSession[]"/> from an AppletResourceId.
+        /// </summary>
+        /// <param name="resourceAppletId">The AppletResourceId used.</param>
+        /// <returns>The associated <see cref="T:VirtualDeviceSession[]"/> from an AppletResourceId.</returns>
+        public VirtualDeviceSession[] GetSessionByAppletResourceId(ulong resourceAppletId)
+        {
+            if (_sessionsRegistry.TryGetValue(resourceAppletId, out VirtualDeviceSession[] result))
+            {
+                return result;
+            }
+
+            result = CreateSessionsFromBehaviourContext();
+
+            _sessionsRegistry.Add(resourceAppletId, result);
+
+            return result;
+        }
+
+        /// <summary>
+        /// Create a new array of sessions for each <see cref="VirtualDevice"/>.
+        /// </summary>
+        /// <returns>A new array of sessions for each <see cref="VirtualDevice"/>.</returns>
+        private static VirtualDeviceSession[] CreateSessionsFromBehaviourContext()
+        {
+            VirtualDeviceSession[] virtualDeviceSession = new VirtualDeviceSession[VirtualDevice.Devices.Length];
+
+            for (int i = 0; i < virtualDeviceSession.Length; i++)
+            {
+                virtualDeviceSession[i] = new VirtualDeviceSession(VirtualDevice.Devices[i]);
+            }
+
+            return virtualDeviceSession;
+        }
+    }
+}