Virtu/Virtu/Xna/Services/XnaAudioService.cs

using System;
using Jellyfish.Library;
using Microsoft.Xna.Framework.Audio;

namespace Jellyfish.Virtu.Services
{
    public sealed class XnaAudioService : AudioService
    {
        public XnaAudioService(Machine machine, GameBase game) : 
            base(machine)
        {
            if (game == null)
            {
                throw new ArgumentNullException("game");
            }

            _game = game;

            _dynamicSoundEffect.BufferNeeded += OnDynamicSoundEffectBufferNeeded;
            _game.Exiting += (sender, e) => _dynamicSoundEffect.Stop();

            _dynamicSoundEffect.SubmitBuffer(SampleZero);
            _dynamicSoundEffect.Play();
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                _dynamicSoundEffect.Dispose();
            }

            base.Dispose(disposing);
        }

        private void OnDynamicSoundEffectBufferNeeded(object sender, EventArgs e) // audio thread
        {
            Update(SampleSize, (source, count) => _dynamicSoundEffect.SubmitBuffer(source, 0, count));
        }

        private GameBase _game;
        private DynamicSoundEffectInstance _dynamicSoundEffect = new DynamicSoundEffectInstance(SampleRate, (AudioChannels)SampleChannels);
    }
}