Data commit

Task/Musical-scale/Java/musical-scale.java

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+import java.util.List;
+import javax.sound.sampled.AudioFormat;
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.LineUnavailableException;
+import javax.sound.sampled.SourceDataLine;
+
+public final class MusicalScale {
+
+	public static void main(String[] aArgs) {
+		List<Double> frequencies = List.of( 261.63, 293.66, 329.63, 349.23, 392.00, 440.00, 493.88, 523.25 );
+		final int duration = 500;
+		final int volume = 1;
+		
+		for ( int i = 0; i < 3; i++ ) {
+			for ( double frequency : frequencies ) {
+				musicalTone(frequency, duration, volume);
+			}
+		}
+	}
+	
+	private static void musicalTone(double aFrequency, int aDuration, int aVolume) {
+	    byte[] buffer = new byte[1];
+	    AudioFormat audioFormat = getAudioFormat();	
+	
+		try ( SourceDataLine sourceDataLine = AudioSystem.getSourceDataLine(audioFormat) ) {		
+		    sourceDataLine.open(audioFormat);
+		    sourceDataLine.start();
+		
+		    for ( int i = 0; i < aDuration * 8; i++ ) {
+		        double angle = i / ( SAMPLE_RATE / aFrequency ) * 2 * Math.PI;
+		        buffer[0] = (byte) ( Math.sin(angle) * 127 * aVolume );
+		        sourceDataLine.write(buffer, BYTE_OFFSET, buffer.length);
+		    }
+		
+		    sourceDataLine.drain();
+		    sourceDataLine.stop();
+		    sourceDataLine.close();
+		} catch (LineUnavailableException exception) {
+			exception.printStackTrace();
+		}
+	}
+	
+	private static AudioFormat getAudioFormat() {
+		final int sampleSizeInBits = 8;
+		final int numberChannels = 1;
+		final boolean signedData = true;
+		final boolean isBigEndian = false;
+		
+		return new AudioFormat(SAMPLE_RATE, sampleSizeInBits, numberChannels, signedData, isBigEndian);
+	}
+	
+	private static float SAMPLE_RATE = 8_000.0F;
+	private static final int BYTE_OFFSET = 0;
+
+}