First develop commit. Adding all existing files.

src/audio/PlayThatTune.java

@@ -0,0 +1,42 @@
+package audio;
+
+import java.io.IOException;
+
+import stdlib.StdAudio;
+import stdlib.StdIn;
+
+/**
+ * This is a data-driven program that plays pure tones from
+ * the notes on the chromatic scale, specified on standard input
+ * by their distance from concert A.
+ * % java PlayThatTune < elise.txt
+ * @author Daniel Weschke
+ */
+public class PlayThatTune {
+
+    public static void main(String[] args) throws IOException {
+    	if(args.length == 0) return;
+
+        // repeat as long as there are more integers to read in
+        while(!StdIn.isEmpty()) {
+
+            // read in the pitch, where 0 = Concert A (A4)
+            int pitch = StdIn.readInt();
+
+            // read in duration in seconds
+            double duration = StdIn.readDouble();
+
+            // build sine wave with desired frequency
+            double hz = 440 * Math.pow(2, pitch / 12.0);
+            int N = (int) (StdAudio.SAMPLE_RATE * duration);
+            double[] a = new double[N+1];
+            int i;
+            for(i=0; i<=N; i++) {
+                a[i] = Math.sin(2 * Math.PI * i * hz / StdAudio.SAMPLE_RATE);
+            }
+
+            // play it using standard audio
+            StdAudio.play(a);
+        }
+    }
+}