TestOpus.cs

using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using UnityEngine;

namespace Assets
{
    public class TestOpus
        : MonoBehaviour
    {
        public bool TestNow;

        void Update()
        {
            if (TestNow)
            {
                TestNow = false;

                Debug.Log(OpusVersion());
            }
        }

        public static string OpusVersion()
        {
            // ReSharper disable once AssignNullToNotNullAttribute
            return Marshal.PtrToStringAnsi(OpusNativeMethods.opus_get_version_string());
        }

#if UNITY_IOS && !UNITY_EDITOR
        private const string ImportString = "__Internal";
        private const CallingConvention Convention = CallingConvention.Cdecl;
#else
        private const string ImportString = "opus";
        private const CallingConvention Convention = CallingConvention.Cdecl;
#endif

        /// <summary>
        /// General opus methods
        /// </summary>
        private static partial class OpusNativeMethods
        {
#if UNITY_IOS && !UNITY_EDITOR
            [DllImport("__Internal", CallingConvention = CallingConvention.Cdecl)]
#else
            [DllImport(ImportString, EntryPoint = "opus_get_version_string", CallingConvention = CallingConvention.Cdecl)]
#endif
            internal static extern IntPtr opus_get_version_string();
        }
    }
}