Adding D#+ opus interop

Author: Yucked

src/Interop/Enums/OpusControl.cs

@@ -0,0 +1,8 @@
+namespace Vysn.Voice.Interop.Enums {
+    /// <summary>
+    /// 
+    /// </summary>
+    public enum OpusControl {
+        
+    }
+}

src/Interop/Enums/OpusError.cs

@@ -0,0 +1,8 @@
+namespace Vysn.Voice.Interop.Enums {
+    /// <summary>
+    /// 
+    /// </summary>
+    public enum OpusError {
+        
+    }
+}

src/Interop/OpusInterop.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Runtime.InteropServices;
+using Vysn.Voice.Interop.Enums;
+
+namespace Vysn.Voice.Interop {
+    /// <summary>
+    /// 
+    /// </summary>
+    public readonly struct OpusInterop {
+        private const string NAME = "libopus";
+
+        [DllImport(NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern IntPtr opus_encoder_create(int sampleRate, int channels, int application,
+                                                          out OpusError error);
+
+        [DllImport(NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern void opus_encoder_destroy(IntPtr encoder);
+
+        [DllImport(NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern int opus_encode(IntPtr encoder, byte[] pcm, int frameSize, IntPtr data,
+                                               int maxDataBytes);
+
+        [DllImport(NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern OpusError opus_encoder_ctl(IntPtr encoder, OpusControl request, int value);
+
+        [DllImport(NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern IntPtr opus_decoder_create(int sampleRate, int channels, out OpusError error);
+
+        [DllImport(NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern void opus_decoder_destroy(IntPtr decoder);
+    }
+}