Move solution and projects to src

src/Ryujinx.Audio/Integration/IHardwareDevice.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Integration
+{
+    /// <summary>
+    /// Represent an hardware device used in <see cref="Renderer.Dsp.Command.DeviceSinkCommand"/>
+    /// </summary>
+    public interface IHardwareDevice : IDisposable
+    {
+        /// <summary>
+        /// Sets the volume level for this device.
+        /// </summary>
+        /// <param name="volume">The volume level to set.</param>
+        void SetVolume(float volume);
+
+        /// <summary>
+        /// Gets the volume level for this device.
+        /// </summary>
+        /// <returns>The volume level of this device.</returns>
+        float GetVolume();
+
+        /// <summary>
+        /// Get the supported sample rate of this device.
+        /// </summary>
+        /// <returns>The supported sample rate of this device.</returns>
+        uint GetSampleRate();
+
+        /// <summary>
+        /// Get the channel count supported by this device.
+        /// </summary>
+        /// <returns>The channel count supported by this device.</returns>
+        uint GetChannelCount();
+
+        /// <summary>
+        /// Appends new PCM16 samples to the device.
+        /// </summary>
+        /// <param name="data">The new PCM16 samples.</param>
+        /// <param name="channelCount">The number of channels.</param>
+        void AppendBuffer(ReadOnlySpan<short> data, uint channelCount);
+
+        /// <summary>
+        /// Check if the audio renderer needs to perform downmixing.
+        /// </summary>
+        /// <returns>True if downmixing is needed.</returns>
+        public bool NeedDownmixing()
+        {
+            uint channelCount = GetChannelCount();
+
+            Debug.Assert(channelCount > 0 && channelCount <= Constants.ChannelCountMax);
+
+            return channelCount != Constants.ChannelCountMax;
+        }
+    }
+}