Xamarin.Android Wave Header Method

WriteWavHeader.cs

using System;
using System.IO;

public void WriteWavHeader(string filePath, int sampleRate, short bitsPerSample, short channels)
{         
	using (var fs = File.Open(filePath, FileMode.Open, FileAccess.ReadWrite))
	{
		using (BinaryWriter writer = new BinaryWriter(fs, System.Text.Encoding.UTF8))
		{
			writer.Seek(0, SeekOrigin.Begin);
			
			// ChunkID               
			writer.Write('R');
			writer.Write('I');
			writer.Write('F');
			writer.Write('F');

			// ChunkSize               
			writer.Write(BitConverter.GetBytes(fs.Length + 36), 0, 4);
			
			// Format               
			writer.Write('W');
			writer.Write('A');
			writer.Write('V');
			writer.Write('E');
			
			//SubChunk               
			writer.Write('f');
			writer.Write('m');
			writer.Write('t');
			writer.Write(' ');

			// SubChunk1Size - 16 for PCM
			writer.Write(BitConverter.GetBytes(16), 0, 4);
			
			// AudioFormat - PCM=1
			writer.Write(BitConverter.GetBytes((short)1), 0, 2);

			// Channels: Mono=1, Stereo=2
			writer.Write(BitConverter.GetBytes(channels), 0, 2);
			
			// SampleRate
			writer.Write(sampleRate);
		
			// ByteRate
			var byteRate = sampleRate * 1 * bitsPerSample / 8;               
			writer.Write(BitConverter.GetBytes(byteRate), 0, 4);

			// BlockAlign
			var blockAlign = channels * bitsPerSample / 8;
			writer.Write(BitConverter.GetBytes((short)blockAlign), 0, 2);

			// BitsPerSample
			writer.Write(BitConverter.GetBytes(bitsPerSample), 0, 2);
			
			// SubChunk2ID
			writer.Write('d');
			writer.Write('a');
			writer.Write('t');
			writer.Write('a');
			
			// Subchunk2Size
			writer.Write(BitConverter.GetBytes(fs.Length), 0, 4);
		}	
	}         
}