SoundEffect.cs

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using System;
using System.Diagnostics;
using Microsoft.Xna.Framework.Audio;

using XnaSoundEffect = Microsoft.Xna.Framework.Audio.SoundEffect;
using System.Collections.Generic;

namespace Jypeli
{
    public class SoundEffect
    {
        List<Sound> Instances = new List<Sound>();

        private string assetName;
        XnaSoundEffect xnaEffect;
        Timer posTimer;

        public TimeSpan Duration { get { DoLoad(); return xnaEffect.Duration; } }

        public DoubleMeter Position { get; set; }

        public bool IsPlaying { get; private set; }

        private void DoLoad()
        {
            if (xnaEffect == null)
            {
                Debug.Assert(assetName != null);
                xnaEffect = Game.Instance.Content.Load<XnaSoundEffect>(assetName);
            }

            Position.MaxValue = xnaEffect.Duration.TotalSeconds;
        }

        internal SoundEffect(string assetName)
        {
            this.assetName = assetName;
            this.xnaEffect = null;
            InitPosition();
        }

        internal SoundEffect( XnaSoundEffect effect )
        {
            this.Position = new DoubleMeter(0, 0, 0);
            this.assetName = null;
            xnaEffect = effect;
            InitPosition();
        }

        private void InitPosition()
        {
            Position = new DoubleMeter(0, 0, 0);
            posTimer = new Timer();
            posTimer.Interval = 0.01;
            posTimer.Timeout += new Action(IncrementPosition);
            Position.UpperLimit += EffectPlayed;
        }

        private void IncrementPosition()
        {
            Position.Value += posTimer.Interval;
        }

        private void EffectPlayed()
        {
            posTimer.Stop();
            Position.Reset();
            Instances.Clear();
            IsPlaying = false;
        }

        public Sound CreateSound()
        {
            DoLoad();
            return new Sound( xnaEffect.CreateInstance() );
        }

        public bool Play()
        {
            DoLoad();
            Sound sound = CreateSound();
            if (sound == null) return false;

            StartPlaying( sound );
            return true;
        }

        public bool Play( double volume, double pitch, double pan )
        {
            DoLoad();
            Sound sound = CreateSound();
            if (sound == null) return false;

            sound.Volume = volume;
            sound.Pitch = pitch;
            sound.Pan = pan;

            StartPlaying( sound );
            return true;
        }

        private void StartPlaying( Sound sound )
        {
            sound.Play();
            Instances.Add( sound );
            Position.Reset();
            posTimer.Start();
            IsPlaying = true;
        }

        public void Stop()
        {
            foreach (var sound in Instances)
            {
                sound.Stop();
            }

            EffectPlayed();
        }

        public static double MasterVolume 
        {
            set { XnaSoundEffect.MasterVolume = (float)value; }
            get { return XnaSoundEffect.MasterVolume; }
        }
    }
}