/// <summary>
/// A bare bones WAV file header writer
/// </summary>
private static void WriteWavHeader(Stream stream)
{
// Data length to be fixed up later
int dataLength = 0;
// We need to use a memory stream because the BinaryWriter will close the underlying stream when it is closed
MemoryStream memStream = null;
BinaryWriter bw = null;
// FXCop note: This try/finally block may look strange, but it is
// the recommended way to correctly dispose a stream that is used
// by a writer to avoid the stream from being double disposed.
// For more information see FXCop rule: CA2202
try
{
memStream = new MemoryStream(64);
WAVEFORMATEX format = new WAVEFORMATEX
{
FormatTag = 1,
Channels = 1,
SamplesPerSec = 16000,
AvgBytesPerSec = 32000,
BlockAlign = 2,
BitsPerSample = 16,
Size = 0
};
bw = new BinaryWriter(memStream);
// RIFF header
WriteHeaderString(memStream, RiffHeaderTag);
bw.Write(dataLength + FullHeaderSize - 8); // File size - 8
WriteHeaderString(memStream, "WAVE");
WriteHeaderString(memStream, "fmt ");
bw.Write(WaveformatExSize);
// WAVEFORMATEX
bw.Write(format.FormatTag);
bw.Write(format.Channels);
bw.Write(format.SamplesPerSec);
bw.Write(format.AvgBytesPerSec);
bw.Write(format.BlockAlign);
bw.Write(format.BitsPerSample);
bw.Write(format.Size);
// data header
WriteHeaderString(memStream, DataHeaderTag);
bw.Write(dataLength);
memStream.WriteTo(stream);
}
finally
{
if (bw != null)
{
memStream = null;
bw.Dispose();
}
if (memStream != null)
{
memStream.Dispose();
}
}
}
