src/Audio/AudioDevice.cs - fna-workbench Git Source Tree

#region License
/* FNA - XNA4 Reimplementation for Desktop Platforms
 * Copyright 2009-2016 Ethan Lee and the MonoGame Team
 *
 * Released under the Microsoft Public License.
 * See LICENSE for details.
 */
#endregion
 
#region Using Statements
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
#endregion
 
namespace Microsoft.Xna.Framework.Audio
{
    internal static class AudioDevice
    {
        #region RendererDetail List
 
        public static ReadOnlyCollection<RendererDetail> Renderers;
 
        #endregion
 
        #region Internal AL Device
 
        // FIXME: readonly? -flibit
        public static IALDevice ALDevice;
 
        #endregion
 
        #region SoundEffect Management Variables
 
        // FIXME: readonly? -flibit
 
        // Used to store SoundEffectInstances generated internally.
        public static List<SoundEffectInstance> InstancePool;
 
        // Used to store all DynamicSoundEffectInstances, to check buffer counts.
        public static List<DynamicSoundEffectInstance> DynamicInstancePool;
 
        #endregion
 
        #region Microphone Management Variables
 
        // FIXME: readonly? -flibit
 
        // Used to store Microphones that are currently recording
        public static List<Microphone> ActiveMics;
 
        #endregion
 
        #region Public Static Initialize Method
 
        public static void Initialize()
        {
            // We should only have one of these!
            if (ALDevice != null)
            {
                FNAPlatform.Log("ALDevice already exists, overwriting!");
            }
 
            bool disableSound = Environment.GetEnvironmentVariable(
                "FNA_AUDIO_DISABLE_SOUND"
            ) == "1";
 
            if (disableSound)
            {
                ALDevice = new NullDevice();
            }
            else
            {
                ALDevice = FNAPlatform.CreateALDevice();
            }
 
            // Populate device list
            if (ALDevice != null)
            {
                Renderers = ALDevice.GetDevices();
                Microphone.All = ALDevice.GetCaptureDevices();
 
                InstancePool = new List<SoundEffectInstance>();
                DynamicInstancePool = new List<DynamicSoundEffectInstance>();
                ActiveMics = new List<Microphone>();
            }
            else
            {
                Renderers = new ReadOnlyCollection<RendererDetail>(new List<RendererDetail>());
                Microphone.All = new ReadOnlyCollection<Microphone>(new List<Microphone>());
            }
        }
 
        #endregion
 
        #region Public Static Dispose Method
 
        public static void Dispose()
        {
            if (ALDevice != null)
            {
                InstancePool.Clear();
                DynamicInstancePool.Clear();
                ALDevice.Dispose();
                // ALDevice = null; <- May cause Exceptions!
            }
        }
 
        #endregion
 
        #region Public Static Update Methods
 
        public static void Update()
        {
            if (ALDevice != null)
            {
                ALDevice.Update();
 
                for (int i = 0; i < InstancePool.Count; i += 1)
                {
                    if (InstancePool[i].State == SoundState.Stopped)
                    {
                        InstancePool[i].Dispose();
                        InstancePool.RemoveAt(i);
                        i -= 1;
                    }
                }
 
                foreach (DynamicSoundEffectInstance sfi in DynamicInstancePool)
                {
                    sfi.Update();
                }
 
                foreach (Microphone mic in ActiveMics)
                {
                    mic.CheckBuffer();
                }
            }
        }
 
        #endregion
 
        #region Public Static Buffer Methods
 
        public static IALBuffer GenBuffer()
        {
            if (ALDevice == null)
            {
                throw new NoAudioHardwareException();
            }
            return ALDevice.GenBuffer();
        }
 
        public static IALBuffer GenBuffer(
            byte[] data,
            uint sampleRate,
            uint channels,
            uint loopStart,
            uint loopEnd,
            bool isADPCM,
            uint formatParameter
        ) {
            if (ALDevice == null)
            {
                throw new NoAudioHardwareException();
            }
            return ALDevice.GenBuffer(
                data,
                sampleRate,
                channels,
                loopStart,
                loopEnd,
                isADPCM,
                formatParameter
            );
        }
 
        #endregion
 
        #region Public Static Reverb Methods
 
        public static IALReverb GenReverb(DSPParameter[] parameters)
        {
            if (ALDevice == null)
            {
                throw new NoAudioHardwareException();
            }
            return ALDevice.GenReverb(parameters);
        }
 
        #endregion
    }
}
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