WriteExample.java

package uk.co.labbookpages;
import java.io.*;

public class WriteExample
{
	public static void main(String[] args)
	{
		try
		{
			int sampleRate = 44100;		// Samples per second
			double duration = 5.0;		// Seconds

			// Calculate the number of frames required for specified duration
			long numFrames = (long)(duration * sampleRate);

			// Create a wav file with the name specified as the first argument
			WavFile wavFile = WavFile.newWavFile(new File(args[0]), 2, numFrames, 16, sampleRate);

			// Create a buffer of 100 frames
			double[][] buffer = new double[2][100];

			// Initialise a local frame counter
			long frameCounter = 0;

			// Loop until all frames written
			while (frameCounter < numFrames)
			{
				// Determine how many frames to write, up to a maximum of the buffer size
				long remaining = wavFile.getFramesRemaining();
				int toWrite = (remaining > 100) ? 100 : (int) remaining;

				// Fill the buffer, one tone per channel
				for (int s=0 ; s<toWrite ; s++, frameCounter++)
				{
					buffer[0][s] = Math.sin(2.0 * Math.PI * 400 * frameCounter / sampleRate);
					buffer[1][s] = Math.sin(2.0 * Math.PI * 500 * frameCounter / sampleRate);
				}

				// Write the buffer
				wavFile.writeFrames(buffer, toWrite);
			}

			// Close the wavFile
			wavFile.close();
		}
		catch (Exception e)
		{
			System.err.println(e);
		}
	}
}