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Root/src/Content/ContentReaders/SoundEffectReader.cs

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#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.IO;
 
using Microsoft.Xna.Framework.Audio;
#endregion
 
namespace Microsoft.Xna.Framework.Content
{
    internal class SoundEffectReader : ContentTypeReader<SoundEffect>
    {
        #region Private Supported File Extensions Variable
 
        static string[] supportedExtensions = new string[] { ".wav" };
 
        #endregion
 
        #region Internal Filename Normalizer Method
 
        internal static string Normalize(string fileName)
        {
            return Normalize(fileName, supportedExtensions);
        }
 
        #endregion
 
        #region Protected Read Method
 
        protected internal override SoundEffect Read(
            ContentReader input,
            SoundEffect existingInstance
        ) {
            // Format block length
            uint formatLength = input.ReadUInt32();
 
            // Wavedata format
            ushort format = input.ReadUInt16();
 
            // Number of channels
            ushort channels = input.ReadUInt16();
 
            // Sample rate
            uint sampleRate = input.ReadUInt32();
 
            // Averate bytes per second, unused
            input.ReadUInt32();
 
            // Block alignment, needed for MSADPCM
            ushort blockAlign = input.ReadUInt16();
 
            // Bit depth
            ushort bitDepth = input.ReadUInt16();
 
            // cbSize, unused
            input.ReadUInt16();
 
            // Seek past the rest of this crap
            input.BaseStream.Seek(formatLength - 18, SeekOrigin.Current);
 
            // Wavedata
            byte[] data = input.ReadBytes(input.ReadInt32());
 
            // Loop information
            uint loopStart = input.ReadUInt32();
            uint loopLength = input.ReadUInt32();
 
            // Sound duration in milliseconds, unused
            input.ReadUInt32();
 
            return new SoundEffect(
                input.AssetName,
                data,
                sampleRate,
                channels,
                loopStart,
                loopLength,
                format == 2,
                (uint) ((format == 2) ? (((blockAlign / channels) - 6) * 2) : (bitDepth / 16))
            );
        }
 
        #endregion
    }
}

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