public static FormatChunk GetFormatChunk(Stream stream)
{
var formatChunk=new FormatChunk();
var rawData=new byte[24];
stream.Read(rawData,0,rawData.Length);
formatChunk.ID=Encoding.ASCII.GetString(rawData.Take(4).ToArray());
formatChunk.Size=BitConverter.ToInt32(rawData.Skip(4).Take(4).ToArray(),0);
formatChunk.FormatTag=BitConverter.ToInt16(rawData.Skip(8).Take(2).ToArray(),0);
formatChunk.Channels=BitConverter.ToUInt16(rawData.Skip(10).Take(2).ToArray(),0);
formatChunk.SamplesPerSecond=BitConverter.ToUInt32(rawData.Skip(12).Take(4).ToArray(),0);
formatChunk.AverageBytesPerSecond=BitConverter.ToUInt32(rawData.Skip(16).Take(4).ToArray(),0);
formatChunk.BlockAlign=BitConverter.ToUInt16(rawData.Skip(20).Take(2).ToArray(),0);
formatChunk.BitsPerSecond=BitConverter.ToUInt16(rawData.Skip(22).ToArray(),0);
return formatChunk;
}
public static FormatChunk GetFormatChunk(Stream stream)
{
var formatChunk = new FormatChunk();
var rawData = new byte[24];
stream.Read(rawData, 0, rawData.Length);
formatChunk.ID = Encoding.ASCII.GetString(rawData.Take(4).ToArray());
formatChunk.Size = BitConverter.ToInt32(rawData.Skip(4).Take(4).ToArray(), 0);
formatChunk.FormatTag = BitConverter.ToInt16(rawData.Skip(8).Take(2).ToArray(), 0);
formatChunk.Channels = BitConverter.ToUInt16(rawData.Skip(10).Take(2).ToArray(), 0);
formatChunk.SamplesPerSecond = BitConverter.ToUInt32(rawData.Skip(12).Take(4).ToArray(), 0);
formatChunk.AverageBytesPerSecond = BitConverter.ToUInt32(rawData.Skip(16).Take(4).ToArray(), 0);
formatChunk.BlockAlign = BitConverter.ToUInt16(rawData.Skip(20).Take(2).ToArray(), 0);
formatChunk.BitsPerSecond = BitConverter.ToUInt16(rawData.Skip(22).ToArray(), 0);
return(formatChunk);
}
public WaveFile(string fileName)
{
var stream = File.OpenRead(fileName);
RiffHeader = RiffHeader.GetRiffHeader(stream);
var pos = stream.Position;
FormatChunk = FormatChunk.GetFormatChunk(stream);
stream.Position = pos + FormatChunk.Size + 8;
DataChunk = DataChunk.GetDataChunk(stream);
if (stream.Length < 12 + 8 + FormatChunk.Size + 8 + DataChunk.Size)
{
throw new InvalidDataException("WAVEファイルの形式が不正です。");
}
var waveDataStream = new BinaryReader(stream);
Data = new short[DataChunk.Size / 2];
unsafe {
fixed(short *ptr = &Data[0])
using (var unmanagedStream = new UnmanagedMemoryStream((byte *)ptr, DataChunk.Size, DataChunk.Size, FileAccess.Write))
stream.CopyTo(unmanagedStream);
}
stream.Dispose();
}
