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+<!doctype html>
+<html>
+<head>
+ <title>WaveShaperNode interface - Curve tests | WebAudio</title>
+
+ <script type="text/javascript" src="/resources/testharness.js"></script>
+ <script type="text/javascript" src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+ <div id="log">
+ </div>
+
+ <script type="text/javascript">
+ var sampleRate=44100.0;
+ var tolerance=0.01;
+
+ /*
+ Testing that -1, 0 and +1 map correctly to curve (with 1:1 correlation)
+ =======================================================================
+ From the specification:
+ The input signal is nominally within the range -1 -> +1.
+ Each input sample within this range will index into the shaping curve with a signal level of zero corresponding
+ to the center value of the curve array.
+ */
+ (function() {
+ var threeElementCurve=[2.0, -3.0, 4.0];
+ var inputData=[-1.0, 0, 1.0];
+ var expectedData=[2.0, -3.0, 4.0];
+ executeTest(threeElementCurve, inputData, expectedData, "Testing that -1, 0 and +1 map correctly to curve (with 1:1 correlation)");
+ })();
+
+ /*
+ Testing interpolation (where inputs don't correlate directly to curve elements)
+ ===============================================================================
+ From the specification:
+ The implementation must perform linear interpolation between adjacent points in the curve.
+ */
+ (function() {
+ var threeElementCurve=[2.0, -3.0, 4.0];
+ var inputData=[-0.5, +0.5, +0.75];
+ var expectedData=[-0.5, +0.5, +2.25];
+ executeTest(threeElementCurve, inputData, expectedData, "Testing interpolation (where inputs don't correlate directly to curve elements)");
+ })();
+
+ /*
+ Testing out-of-range inputs (should be mapped to the first/last elements of the curve)
+ ======================================================================================
+ From the specification:
+ Any sample value less than -1 will correspond to the first value in the curve array.
+ Any sample value greater than +1 will correspond to the last value in the curve array.
+ */
+ (function() {
+ var threeElementCurve=[2.0, -3.0, 4.0];
+ var inputData=[-1.5, +1.5];
+ var expectedData=[2.0, 4.0];
+ executeTest(threeElementCurve, inputData, expectedData, "Testing out-of-range inputs (should be mapped to the first/last elements of the curve)");
+ })();
+
+ /*
+ Testing a 2-element curve (does not have a middle element)
+ ==========================================================
+ From the specification:
+ Each input sample within this range will index into the shaping curve with a signal level of zero corresponding
+ to the center value of the curve array.
+ The implementation must perform linear interpolation between adjacent points in the curve.
+ */
+ (function() {
+ var twoElementCurve=[2.0, -2.0];
+ var inputData=[-1.0, 0, 1.0];
+ var expectedData=[2.0, 0.0, -2.0];
+ executeTest(twoElementCurve, inputData, expectedData, "Testing a 2-element curve (does not have a middle element)");
+ })();
+
+ /*
+ Testing a 4-element curve (does not have a middle element)
+ ==========================================================
+ From the specification:
+ Each input sample within this range will index into the shaping curve with a signal level of zero corresponding
+ to the center value of the curve array.
+ The implementation must perform linear interpolation between adjacent points in the curve.
+ */
+ (function() {
+ var fourElementCurve=[1.0, 2.0, 4.0, 7.0];
+ var inputData=[-1.0, 0, 1.0];
+ var expectedData=[1.0, 3.0, 7.0];
+ executeTest(fourElementCurve, inputData, expectedData, "Testing a 4-element curve (does not have a middle element)");
+ })();
+
+ /*
+ Testing a huge curve
+ ====================
+ From the specification:
+ Each input sample within this range will index into the shaping curve with a signal level of zero corresponding
+ to the center value of the curve array.
+ */
+ (function() {
+ var bigCurve=[];
+ for(var i=0;i<=60000;i++) { bigCurve.push(i/3.5435); }
+ var inputData=[-1.0, 0, 1.0];
+ var expectedData=[bigCurve[0], bigCurve[30000], bigCurve[60000]];
+ executeTest(bigCurve, inputData, expectedData, "Testing a huge curve");
+ })();
+
+ /*
+ Testing single-element curve (boundary condition)
+ =================================================
+ From the specification:
+ Each input sample within this range will index into the shaping curve with a signal level of zero corresponding
+ to the center value of the curve array.
+ Any sample value less than -1 will correspond to the first value in the curve array.
+ Any sample value greater than +1 will correspond to the last value in the curve array.
+ The implementation must perform linear interpolation between adjacent points in the curve.
+ */
+
+ /*
+ Testing null curve (should return input values)
+ ===============================================
+ From the specification:
+ Initially the curve attribute is null, which means that the WaveShaperNode will pass its input to its output
+ without modification.
+ */
+ (function() {
+ var inputData=[-1.0, 0, 1.0, 2.0];
+ var expectedData=[-1.0, 0.0, 1.0, 2.0];
+ executeTest(null, inputData, expectedData, "Testing null curve (should return input values)");
+ })();
+
+ /**
+ * Function that does the actual testing (using an asynchronous test).
+ * @param {?Array.<number>} curveData - Array containing values for the WaveShaper curve.
+ * @param {!Array.<number>} inputData - Array containing values for the input stream.
+ * @param {!Array.<number>} expectedData - Array containing expected results for each of the corresponding inputs.
+ * @param {!string} testName - Name of the test case.
+ */
+ function executeTest(curveData, inputData, expectedData, testName) {
+ var stTest=async_test("WaveShaperNode - "+testName);
+ stTest.step(function() {
+
+ // Create offline audio context.
+ var ac=new OfflineAudioContext(1, inputData.length, sampleRate);
+
+ // Create the WaveShaper and its curve.
+ var waveShaper=ac.createWaveShaper();
+ if(curveData!=null) {
+ var curve=new Float32Array(curveData.length);
+ for(var i=0;i<curveData.length;i++) { curve[i]=curveData[i]; }
+ waveShaper.curve=curve;
+ }
+ waveShaper.connect(ac.destination);
+
+ // Create buffer containing the input values.
+ var inputBuffer=ac.createBuffer(1, Math.max(inputData.length, 2), sampleRate);
+ var d=inputBuffer.getChannelData(0);
+ for(var i=0;i<inputData.length;i++) { d[i]=inputData[i]; }
+
+ // Play the input buffer through the WaveShaper.
+ var src=ac.createBufferSource();
+ src.buffer=inputBuffer;
+ src.connect(waveShaper);
+ src.start();
+
+ // Test the outputs match the expected values.
+ ac.oncomplete=stTest.step_func_done(function(ev) {
+ var d=ev.renderedBuffer.getChannelData(0);
+
+ for(var i=0;i<expectedData.length;i++) {
+ var curveText="null";
+ if(curve!=null) {
+ if(curveData.length<20) {
+ curveText=curveData.join(",");
+ } else {
+ curveText="TooBigToDisplay ("+(curveData.length-1)+" elements)";
+ }
+ }
+ var comment="Input="+inputData[i]+", Curve=["+curveText+"] >>> ";
+ assert_approx_equals(d[i], expectedData[i], tolerance, comment);
+ }
+ });
+ ac.startRendering();
+ });
+ }
+ </script>
+</body>
+</html>