Adding David Humphrey's unit tests and test harness

Author: corbanbrook

dsp.js

@@ -192,8 +192,8 @@ DFT.prototype.forward = function(buffer) {
     imag = 0.0;
 
     for ( var n = 0; n < buffer.length; n++ ) {
-      real += this.cosTable[k*n] * signal[n];
-      imag += this.sinTable[k*n] * signal[n];
+      real += this.cosTable[k*n] * buffer[n];
+      imag += this.sinTable[k*n] * buffer[n];
     }
 
     this.complexValues[k] = {real: real, imag: imag};

test/adsr-test.js

@@ -0,0 +1,15 @@
+load('audio-harness.js');
+load('dsp.js');
+
+var iterations = 1000;
+
+var envelope = new ADSR(0.01, 0.1, 0.5, 0.1, 0.2, 44100);
+
+var calcADSR = function() {
+  var fb     = getFramebuffer(),
+      signal = DSP.getChannel(DSP.MIX, fb);
+
+  envelope.process(signal);
+};
+
+runTest(calcADSR, iterations);

test/audio-harness.js

@@ -0,0 +1,22 @@
+load('samples.js');
+
+var startTime,
+    totalTime;
+
+function calcTime() {
+  totalTime = (new Date()).getTime() - startTime;
+}
+
+function printResults(iterations) {
+  print('Total Time: ' + totalTime + 'ms for ' + iterations + ' iterations, ' +
+        (totalTime / iterations) + 'ms per iteration.');
+}
+
+function runTest(test, iterations) {
+ startTime = new Date().getTime();
+ for (var i = 0; i < iterations; i++) {
+   test();
+ }
+ calcTime();
+ printResults(iterations)
+}

test/beatdetect-test.js

@@ -0,0 +1,30 @@
+load('audio-harness.js');
+load('dsp.js');
+load('beatdetektor.js');
+
+var iterations = 1000;
+
+var fft = fft = new FFT(frameBufferLength / channels, rate);
+var bd = new BeatDetektor();
+var kick_det = new BeatDetektor.modules.vis.BassKick();
+var vu = new BeatDetektor.modules.vis.VU();
+
+var m_BeatTimer = 0;
+var m_BeatCounter = 0;
+var ftimer = 0;
+
+var calcBeat = function() {
+  var fb     = getFramebuffer(),
+      signal = DSP.getChannel(DSP.MIX, fb);
+
+  fft.forward(signal);
+
+  var timestamp = (new Date()).getTime();
+  bd.process(timestamp, fft.spectrum);
+
+  // Bass Kick detection
+  kick_det.process(bd);
+  vu.process(bd);
+};
+
+runTest(calcBeat, iterations);