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();
}
