Piper.cs

using System;
using System.IO;
using System.Threading.Tasks;

namespace Abuksigun.Piper
{
    public sealed unsafe class Piper : IDisposable
    {
        PiperLib.PiperConfig* config;
        public PiperLib.PiperConfig* Config => config;

        Piper(PiperLib.PiperConfig* config)
        {
            this.config = config;
        }

        ~Piper()
        {
            Dispose();
        }

        public void Dispose()
        {
            if (config != null)
            {
                PiperLib.terminatePiper(config);
                PiperLib.destroy_PiperConfig(config);
                config = null;
            }
        }

        public static Task<Piper> LoadPiper(string fullEspeakDataPath)
        {
            if (!Directory.Exists(fullEspeakDataPath))
                throw new DirectoryNotFoundException("Espeak data directory not found");

            return Task.Run(() =>
            {
                var piperConfig = PiperLib.create_PiperConfig(fullEspeakDataPath);
                try
                {
                    PiperLib.initializePiper(piperConfig);
                    return Task.FromResult(new Piper(piperConfig));
                }
                catch
                {
                    PiperLib.destroy_PiperConfig(piperConfig);
                    throw;
                }
            });
        }
    }
}